c9cf6e20c6
We concluded that gdbarch_in_function_epilogue_p is misnamed, since it returns true if the given PC is one instruction after the one that destroyed the stack (which isn't necessarily inside an epilogue), therefore it should be renamed to stack_frame_destroyed_p. I also took the liberty of renaming the arch-specific implementations to *_stack_frame_destroyed_p as well for consistency. gdb: 2015-05-26 Martin Galvan <martin.galvan@tallertechnologies.com> * amd64-tdep.c: Replace in_function_epilogue_p with stack_frame_destroyed_p throughout. * arch-utils.c: Ditto. * arch-utils.h: Ditto. * arm-tdep.c: Ditto. * breakpoint.c: Ditto. * gdbarch.sh: Ditto. * hppa-tdep.c: Ditto. * i386-tdep.c: Ditto. * mips-tdep.c: Ditto. * nios2-tdep.c: Ditto. * rs6000-tdep.c: Ditto. * s390-linux-tdep.c: Ditto. * score-tdep.c: Ditto. * sh-tdep.c: Ditto. * sparc-tdep.c: Ditto. * sparc-tdep.h: Ditto. * sparc64-tdep.c: Ditto. * spu-tdep.c: Ditto. * tic6x-tdep.c: Ditto. * tilegx-tdep.c: Ditto. * xstormy16-tdep.c: Ditto. * gdbarch.c, gdbarch.h: Re-generated.
3372 lines
101 KiB
C
3372 lines
101 KiB
C
/* Target-dependent code for GDB, the GNU debugger.
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Copyright (C) 2001-2015 Free Software Foundation, Inc.
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Contributed by D.J. Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
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for IBM Deutschland Entwicklung GmbH, IBM Corporation.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "arch-utils.h"
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#include "frame.h"
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#include "inferior.h"
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#include "infrun.h"
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#include "symtab.h"
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#include "target.h"
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#include "gdbcore.h"
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#include "gdbcmd.h"
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#include "objfiles.h"
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#include "floatformat.h"
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#include "regcache.h"
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#include "trad-frame.h"
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#include "frame-base.h"
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#include "frame-unwind.h"
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#include "dwarf2-frame.h"
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#include "reggroups.h"
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#include "regset.h"
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#include "value.h"
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#include "dis-asm.h"
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#include "solib-svr4.h"
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#include "prologue-value.h"
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#include "linux-tdep.h"
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#include "s390-linux-tdep.h"
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#include "auxv.h"
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#include "xml-syscall.h"
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#include "stap-probe.h"
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#include "ax.h"
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#include "ax-gdb.h"
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#include "user-regs.h"
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#include "cli/cli-utils.h"
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#include <ctype.h>
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#include "elf/common.h"
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#include "elf/s390.h"
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#include "elf-bfd.h"
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#include "features/s390-linux32.c"
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#include "features/s390-linux32v1.c"
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#include "features/s390-linux32v2.c"
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#include "features/s390-linux64.c"
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#include "features/s390-linux64v1.c"
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#include "features/s390-linux64v2.c"
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#include "features/s390-te-linux64.c"
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#include "features/s390-vx-linux64.c"
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#include "features/s390-tevx-linux64.c"
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#include "features/s390x-linux64.c"
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#include "features/s390x-linux64v1.c"
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#include "features/s390x-linux64v2.c"
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#include "features/s390x-te-linux64.c"
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#include "features/s390x-vx-linux64.c"
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#include "features/s390x-tevx-linux64.c"
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#define XML_SYSCALL_FILENAME_S390 "syscalls/s390-linux.xml"
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#define XML_SYSCALL_FILENAME_S390X "syscalls/s390x-linux.xml"
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enum s390_abi_kind
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{
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ABI_LINUX_S390,
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ABI_LINUX_ZSERIES
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};
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enum s390_vector_abi_kind
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{
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S390_VECTOR_ABI_NONE,
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S390_VECTOR_ABI_128
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};
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/* The tdep structure. */
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struct gdbarch_tdep
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{
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/* ABI version. */
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enum s390_abi_kind abi;
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/* Vector ABI. */
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enum s390_vector_abi_kind vector_abi;
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/* Pseudo register numbers. */
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int gpr_full_regnum;
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int pc_regnum;
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int cc_regnum;
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int v0_full_regnum;
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int have_linux_v1;
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int have_linux_v2;
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int have_tdb;
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};
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/* ABI call-saved register information. */
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static int
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s390_register_call_saved (struct gdbarch *gdbarch, int regnum)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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switch (tdep->abi)
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{
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case ABI_LINUX_S390:
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if ((regnum >= S390_R6_REGNUM && regnum <= S390_R15_REGNUM)
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|| regnum == S390_F4_REGNUM || regnum == S390_F6_REGNUM
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|| regnum == S390_A0_REGNUM)
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return 1;
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break;
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case ABI_LINUX_ZSERIES:
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if ((regnum >= S390_R6_REGNUM && regnum <= S390_R15_REGNUM)
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|| (regnum >= S390_F8_REGNUM && regnum <= S390_F15_REGNUM)
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|| (regnum >= S390_A0_REGNUM && regnum <= S390_A1_REGNUM))
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return 1;
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break;
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}
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return 0;
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}
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static int
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s390_cannot_store_register (struct gdbarch *gdbarch, int regnum)
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{
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/* The last-break address is read-only. */
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return regnum == S390_LAST_BREAK_REGNUM;
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}
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static void
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s390_write_pc (struct regcache *regcache, CORE_ADDR pc)
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{
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struct gdbarch *gdbarch = get_regcache_arch (regcache);
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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regcache_cooked_write_unsigned (regcache, tdep->pc_regnum, pc);
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/* Set special SYSTEM_CALL register to 0 to prevent the kernel from
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messing with the PC we just installed, if we happen to be within
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an interrupted system call that the kernel wants to restart.
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Note that after we return from the dummy call, the SYSTEM_CALL and
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ORIG_R2 registers will be automatically restored, and the kernel
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continues to restart the system call at this point. */
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if (register_size (gdbarch, S390_SYSTEM_CALL_REGNUM) > 0)
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regcache_cooked_write_unsigned (regcache, S390_SYSTEM_CALL_REGNUM, 0);
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}
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/* DWARF Register Mapping. */
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static const short s390_dwarf_regmap[] =
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{
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/* 0-15: General Purpose Registers. */
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S390_R0_REGNUM, S390_R1_REGNUM, S390_R2_REGNUM, S390_R3_REGNUM,
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S390_R4_REGNUM, S390_R5_REGNUM, S390_R6_REGNUM, S390_R7_REGNUM,
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S390_R8_REGNUM, S390_R9_REGNUM, S390_R10_REGNUM, S390_R11_REGNUM,
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S390_R12_REGNUM, S390_R13_REGNUM, S390_R14_REGNUM, S390_R15_REGNUM,
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/* 16-31: Floating Point Registers / Vector Registers 0-15. */
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S390_F0_REGNUM, S390_F2_REGNUM, S390_F4_REGNUM, S390_F6_REGNUM,
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S390_F1_REGNUM, S390_F3_REGNUM, S390_F5_REGNUM, S390_F7_REGNUM,
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S390_F8_REGNUM, S390_F10_REGNUM, S390_F12_REGNUM, S390_F14_REGNUM,
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S390_F9_REGNUM, S390_F11_REGNUM, S390_F13_REGNUM, S390_F15_REGNUM,
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/* 32-47: Control Registers (not mapped). */
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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/* 48-63: Access Registers. */
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S390_A0_REGNUM, S390_A1_REGNUM, S390_A2_REGNUM, S390_A3_REGNUM,
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S390_A4_REGNUM, S390_A5_REGNUM, S390_A6_REGNUM, S390_A7_REGNUM,
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S390_A8_REGNUM, S390_A9_REGNUM, S390_A10_REGNUM, S390_A11_REGNUM,
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S390_A12_REGNUM, S390_A13_REGNUM, S390_A14_REGNUM, S390_A15_REGNUM,
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/* 64-65: Program Status Word. */
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S390_PSWM_REGNUM,
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S390_PSWA_REGNUM,
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/* 66-67: Reserved. */
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-1, -1,
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/* 68-83: Vector Registers 16-31. */
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S390_V16_REGNUM, S390_V18_REGNUM, S390_V20_REGNUM, S390_V22_REGNUM,
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S390_V17_REGNUM, S390_V19_REGNUM, S390_V21_REGNUM, S390_V23_REGNUM,
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S390_V24_REGNUM, S390_V26_REGNUM, S390_V28_REGNUM, S390_V30_REGNUM,
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S390_V25_REGNUM, S390_V27_REGNUM, S390_V29_REGNUM, S390_V31_REGNUM,
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/* End of "official" DWARF registers. The remainder of the map is
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for GDB internal use only. */
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/* GPR Lower Half Access. */
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S390_R0_REGNUM, S390_R1_REGNUM, S390_R2_REGNUM, S390_R3_REGNUM,
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S390_R4_REGNUM, S390_R5_REGNUM, S390_R6_REGNUM, S390_R7_REGNUM,
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S390_R8_REGNUM, S390_R9_REGNUM, S390_R10_REGNUM, S390_R11_REGNUM,
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S390_R12_REGNUM, S390_R13_REGNUM, S390_R14_REGNUM, S390_R15_REGNUM,
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};
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enum { s390_dwarf_reg_r0l = ARRAY_SIZE (s390_dwarf_regmap) - 16 };
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/* Convert DWARF register number REG to the appropriate register
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number used by GDB. */
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static int
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s390_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int reg)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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int gdb_reg = -1;
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/* In a 32-on-64 debug scenario, debug info refers to the full
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64-bit GPRs. Note that call frame information still refers to
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the 32-bit lower halves, because s390_adjust_frame_regnum uses
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special register numbers to access GPRs. */
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if (tdep->gpr_full_regnum != -1 && reg >= 0 && reg < 16)
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return tdep->gpr_full_regnum + reg;
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if (reg >= 0 && reg < ARRAY_SIZE (s390_dwarf_regmap))
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gdb_reg = s390_dwarf_regmap[reg];
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if (tdep->v0_full_regnum == -1)
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{
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if (gdb_reg >= S390_V16_REGNUM && gdb_reg <= S390_V31_REGNUM)
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gdb_reg = -1;
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}
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else
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{
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if (gdb_reg >= S390_F0_REGNUM && gdb_reg <= S390_F15_REGNUM)
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gdb_reg = gdb_reg - S390_F0_REGNUM + tdep->v0_full_regnum;
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}
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return gdb_reg;
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}
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/* Translate a .eh_frame register to DWARF register, or adjust a
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.debug_frame register. */
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static int
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s390_adjust_frame_regnum (struct gdbarch *gdbarch, int num, int eh_frame_p)
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{
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/* See s390_dwarf_reg_to_regnum for comments. */
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return (num >= 0 && num < 16) ? num + s390_dwarf_reg_r0l : num;
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}
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/* Pseudo registers. */
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static int
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regnum_is_gpr_full (struct gdbarch_tdep *tdep, int regnum)
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{
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return (tdep->gpr_full_regnum != -1
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&& regnum >= tdep->gpr_full_regnum
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&& regnum <= tdep->gpr_full_regnum + 15);
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}
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/* Check whether REGNUM indicates a full vector register (v0-v15).
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These pseudo-registers are composed of f0-f15 and v0l-v15l. */
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static int
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regnum_is_vxr_full (struct gdbarch_tdep *tdep, int regnum)
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{
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return (tdep->v0_full_regnum != -1
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&& regnum >= tdep->v0_full_regnum
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&& regnum <= tdep->v0_full_regnum + 15);
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}
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/* Return the name of register REGNO. Return the empty string for
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registers that shouldn't be visible. */
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static const char *
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s390_register_name (struct gdbarch *gdbarch, int regnum)
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{
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if (regnum >= S390_V0_LOWER_REGNUM
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&& regnum <= S390_V15_LOWER_REGNUM)
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return "";
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return tdesc_register_name (gdbarch, regnum);
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}
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static const char *
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s390_pseudo_register_name (struct gdbarch *gdbarch, int regnum)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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if (regnum == tdep->pc_regnum)
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return "pc";
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if (regnum == tdep->cc_regnum)
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return "cc";
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if (regnum_is_gpr_full (tdep, regnum))
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{
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static const char *full_name[] = {
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"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
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"r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"
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};
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return full_name[regnum - tdep->gpr_full_regnum];
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}
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if (regnum_is_vxr_full (tdep, regnum))
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{
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static const char *full_name[] = {
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"v0", "v1", "v2", "v3", "v4", "v5", "v6", "v7",
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"v8", "v9", "v10", "v11", "v12", "v13", "v14", "v15"
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};
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return full_name[regnum - tdep->v0_full_regnum];
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}
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internal_error (__FILE__, __LINE__, _("invalid regnum"));
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}
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static struct type *
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s390_pseudo_register_type (struct gdbarch *gdbarch, int regnum)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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if (regnum == tdep->pc_regnum)
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return builtin_type (gdbarch)->builtin_func_ptr;
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if (regnum == tdep->cc_regnum)
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return builtin_type (gdbarch)->builtin_int;
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if (regnum_is_gpr_full (tdep, regnum))
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return builtin_type (gdbarch)->builtin_uint64;
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if (regnum_is_vxr_full (tdep, regnum))
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return tdesc_find_type (gdbarch, "vec128");
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internal_error (__FILE__, __LINE__, _("invalid regnum"));
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}
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static enum register_status
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s390_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,
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int regnum, gdb_byte *buf)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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int regsize = register_size (gdbarch, regnum);
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ULONGEST val;
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if (regnum == tdep->pc_regnum)
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{
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enum register_status status;
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status = regcache_raw_read_unsigned (regcache, S390_PSWA_REGNUM, &val);
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if (status == REG_VALID)
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{
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if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)
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val &= 0x7fffffff;
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store_unsigned_integer (buf, regsize, byte_order, val);
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}
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return status;
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}
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if (regnum == tdep->cc_regnum)
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{
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enum register_status status;
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status = regcache_raw_read_unsigned (regcache, S390_PSWM_REGNUM, &val);
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if (status == REG_VALID)
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{
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if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)
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val = (val >> 12) & 3;
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else
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val = (val >> 44) & 3;
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store_unsigned_integer (buf, regsize, byte_order, val);
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}
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return status;
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}
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if (regnum_is_gpr_full (tdep, regnum))
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{
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enum register_status status;
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ULONGEST val_upper;
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regnum -= tdep->gpr_full_regnum;
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status = regcache_raw_read_unsigned (regcache, S390_R0_REGNUM + regnum, &val);
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if (status == REG_VALID)
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status = regcache_raw_read_unsigned (regcache, S390_R0_UPPER_REGNUM + regnum,
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&val_upper);
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if (status == REG_VALID)
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{
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val |= val_upper << 32;
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store_unsigned_integer (buf, regsize, byte_order, val);
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}
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return status;
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}
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if (regnum_is_vxr_full (tdep, regnum))
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{
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enum register_status status;
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regnum -= tdep->v0_full_regnum;
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status = regcache_raw_read (regcache, S390_F0_REGNUM + regnum, buf);
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if (status == REG_VALID)
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status = regcache_raw_read (regcache,
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S390_V0_LOWER_REGNUM + regnum, buf + 8);
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return status;
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}
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internal_error (__FILE__, __LINE__, _("invalid regnum"));
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}
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|
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static void
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s390_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache,
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int regnum, const gdb_byte *buf)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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int regsize = register_size (gdbarch, regnum);
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ULONGEST val, psw;
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if (regnum == tdep->pc_regnum)
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{
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val = extract_unsigned_integer (buf, regsize, byte_order);
|
|
if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)
|
|
{
|
|
regcache_raw_read_unsigned (regcache, S390_PSWA_REGNUM, &psw);
|
|
val = (psw & 0x80000000) | (val & 0x7fffffff);
|
|
}
|
|
regcache_raw_write_unsigned (regcache, S390_PSWA_REGNUM, val);
|
|
return;
|
|
}
|
|
|
|
if (regnum == tdep->cc_regnum)
|
|
{
|
|
val = extract_unsigned_integer (buf, regsize, byte_order);
|
|
regcache_raw_read_unsigned (regcache, S390_PSWM_REGNUM, &psw);
|
|
if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)
|
|
val = (psw & ~((ULONGEST)3 << 12)) | ((val & 3) << 12);
|
|
else
|
|
val = (psw & ~((ULONGEST)3 << 44)) | ((val & 3) << 44);
|
|
regcache_raw_write_unsigned (regcache, S390_PSWM_REGNUM, val);
|
|
return;
|
|
}
|
|
|
|
if (regnum_is_gpr_full (tdep, regnum))
|
|
{
|
|
regnum -= tdep->gpr_full_regnum;
|
|
val = extract_unsigned_integer (buf, regsize, byte_order);
|
|
regcache_raw_write_unsigned (regcache, S390_R0_REGNUM + regnum,
|
|
val & 0xffffffff);
|
|
regcache_raw_write_unsigned (regcache, S390_R0_UPPER_REGNUM + regnum,
|
|
val >> 32);
|
|
return;
|
|
}
|
|
|
|
if (regnum_is_vxr_full (tdep, regnum))
|
|
{
|
|
regnum -= tdep->v0_full_regnum;
|
|
regcache_raw_write (regcache, S390_F0_REGNUM + regnum, buf);
|
|
regcache_raw_write (regcache, S390_V0_LOWER_REGNUM + regnum, buf + 8);
|
|
return;
|
|
}
|
|
|
|
internal_error (__FILE__, __LINE__, _("invalid regnum"));
|
|
}
|
|
|
|
/* 'float' values are stored in the upper half of floating-point
|
|
registers, even though we are otherwise a big-endian platform. The
|
|
same applies to a 'float' value within a vector. */
|
|
|
|
static struct value *
|
|
s390_value_from_register (struct gdbarch *gdbarch, struct type *type,
|
|
int regnum, struct frame_id frame_id)
|
|
{
|
|
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
|
struct value *value = default_value_from_register (gdbarch, type,
|
|
regnum, frame_id);
|
|
check_typedef (type);
|
|
|
|
if ((regnum >= S390_F0_REGNUM && regnum <= S390_F15_REGNUM
|
|
&& TYPE_LENGTH (type) < 8)
|
|
|| regnum_is_vxr_full (tdep, regnum)
|
|
|| (regnum >= S390_V16_REGNUM && regnum <= S390_V31_REGNUM))
|
|
set_value_offset (value, 0);
|
|
|
|
return value;
|
|
}
|
|
|
|
/* Register groups. */
|
|
|
|
static int
|
|
s390_pseudo_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
|
|
struct reggroup *group)
|
|
{
|
|
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
|
|
|
/* We usually save/restore the whole PSW, which includes PC and CC.
|
|
However, some older gdbservers may not support saving/restoring
|
|
the whole PSW yet, and will return an XML register description
|
|
excluding those from the save/restore register groups. In those
|
|
cases, we still need to explicitly save/restore PC and CC in order
|
|
to push or pop frames. Since this doesn't hurt anything if we
|
|
already save/restore the whole PSW (it's just redundant), we add
|
|
PC and CC at this point unconditionally. */
|
|
if (group == save_reggroup || group == restore_reggroup)
|
|
return regnum == tdep->pc_regnum || regnum == tdep->cc_regnum;
|
|
|
|
if (group == vector_reggroup)
|
|
return regnum_is_vxr_full (tdep, regnum);
|
|
|
|
if (group == general_reggroup && regnum_is_vxr_full (tdep, regnum))
|
|
return 0;
|
|
|
|
return default_register_reggroup_p (gdbarch, regnum, group);
|
|
}
|
|
|
|
|
|
/* Maps for register sets. */
|
|
|
|
static const struct regcache_map_entry s390_gregmap[] =
|
|
{
|
|
{ 1, S390_PSWM_REGNUM },
|
|
{ 1, S390_PSWA_REGNUM },
|
|
{ 16, S390_R0_REGNUM },
|
|
{ 16, S390_A0_REGNUM },
|
|
{ 1, S390_ORIG_R2_REGNUM },
|
|
{ 0 }
|
|
};
|
|
|
|
static const struct regcache_map_entry s390_fpregmap[] =
|
|
{
|
|
{ 1, S390_FPC_REGNUM, 8 },
|
|
{ 16, S390_F0_REGNUM, 8 },
|
|
{ 0 }
|
|
};
|
|
|
|
static const struct regcache_map_entry s390_regmap_upper[] =
|
|
{
|
|
{ 16, S390_R0_UPPER_REGNUM, 4 },
|
|
{ 0 }
|
|
};
|
|
|
|
static const struct regcache_map_entry s390_regmap_last_break[] =
|
|
{
|
|
{ 1, REGCACHE_MAP_SKIP, 4 },
|
|
{ 1, S390_LAST_BREAK_REGNUM, 4 },
|
|
{ 0 }
|
|
};
|
|
|
|
static const struct regcache_map_entry s390x_regmap_last_break[] =
|
|
{
|
|
{ 1, S390_LAST_BREAK_REGNUM, 8 },
|
|
{ 0 }
|
|
};
|
|
|
|
static const struct regcache_map_entry s390_regmap_system_call[] =
|
|
{
|
|
{ 1, S390_SYSTEM_CALL_REGNUM, 4 },
|
|
{ 0 }
|
|
};
|
|
|
|
static const struct regcache_map_entry s390_regmap_tdb[] =
|
|
{
|
|
{ 1, S390_TDB_DWORD0_REGNUM, 8 },
|
|
{ 1, S390_TDB_ABORT_CODE_REGNUM, 8 },
|
|
{ 1, S390_TDB_CONFLICT_TOKEN_REGNUM, 8 },
|
|
{ 1, S390_TDB_ATIA_REGNUM, 8 },
|
|
{ 12, REGCACHE_MAP_SKIP, 8 },
|
|
{ 16, S390_TDB_R0_REGNUM, 8 },
|
|
{ 0 }
|
|
};
|
|
|
|
static const struct regcache_map_entry s390_regmap_vxrs_low[] =
|
|
{
|
|
{ 16, S390_V0_LOWER_REGNUM, 8 },
|
|
{ 0 }
|
|
};
|
|
|
|
static const struct regcache_map_entry s390_regmap_vxrs_high[] =
|
|
{
|
|
{ 16, S390_V16_REGNUM, 16 },
|
|
{ 0 }
|
|
};
|
|
|
|
|
|
/* Supply the TDB regset. Like regcache_supply_regset, but invalidate
|
|
the TDB registers unless the TDB format field is valid. */
|
|
|
|
static void
|
|
s390_supply_tdb_regset (const struct regset *regset, struct regcache *regcache,
|
|
int regnum, const void *regs, size_t len)
|
|
{
|
|
ULONGEST tdw;
|
|
enum register_status ret;
|
|
int i;
|
|
|
|
regcache_supply_regset (regset, regcache, regnum, regs, len);
|
|
ret = regcache_cooked_read_unsigned (regcache, S390_TDB_DWORD0_REGNUM, &tdw);
|
|
if (ret != REG_VALID || (tdw >> 56) != 1)
|
|
regcache_supply_regset (regset, regcache, regnum, NULL, len);
|
|
}
|
|
|
|
const struct regset s390_gregset = {
|
|
s390_gregmap,
|
|
regcache_supply_regset,
|
|
regcache_collect_regset
|
|
};
|
|
|
|
const struct regset s390_fpregset = {
|
|
s390_fpregmap,
|
|
regcache_supply_regset,
|
|
regcache_collect_regset
|
|
};
|
|
|
|
static const struct regset s390_upper_regset = {
|
|
s390_regmap_upper,
|
|
regcache_supply_regset,
|
|
regcache_collect_regset
|
|
};
|
|
|
|
const struct regset s390_last_break_regset = {
|
|
s390_regmap_last_break,
|
|
regcache_supply_regset,
|
|
regcache_collect_regset
|
|
};
|
|
|
|
const struct regset s390x_last_break_regset = {
|
|
s390x_regmap_last_break,
|
|
regcache_supply_regset,
|
|
regcache_collect_regset
|
|
};
|
|
|
|
const struct regset s390_system_call_regset = {
|
|
s390_regmap_system_call,
|
|
regcache_supply_regset,
|
|
regcache_collect_regset
|
|
};
|
|
|
|
const struct regset s390_tdb_regset = {
|
|
s390_regmap_tdb,
|
|
s390_supply_tdb_regset,
|
|
regcache_collect_regset
|
|
};
|
|
|
|
const struct regset s390_vxrs_low_regset = {
|
|
s390_regmap_vxrs_low,
|
|
regcache_supply_regset,
|
|
regcache_collect_regset
|
|
};
|
|
|
|
const struct regset s390_vxrs_high_regset = {
|
|
s390_regmap_vxrs_high,
|
|
regcache_supply_regset,
|
|
regcache_collect_regset
|
|
};
|
|
|
|
/* Iterate over supported core file register note sections. */
|
|
|
|
static void
|
|
s390_iterate_over_regset_sections (struct gdbarch *gdbarch,
|
|
iterate_over_regset_sections_cb *cb,
|
|
void *cb_data,
|
|
const struct regcache *regcache)
|
|
{
|
|
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
|
const int gregset_size = (tdep->abi == ABI_LINUX_S390 ?
|
|
s390_sizeof_gregset : s390x_sizeof_gregset);
|
|
|
|
cb (".reg", gregset_size, &s390_gregset, NULL, cb_data);
|
|
cb (".reg2", s390_sizeof_fpregset, &s390_fpregset, NULL, cb_data);
|
|
|
|
if (tdep->abi == ABI_LINUX_S390 && tdep->gpr_full_regnum != -1)
|
|
cb (".reg-s390-high-gprs", 16 * 4, &s390_upper_regset,
|
|
"s390 GPR upper halves", cb_data);
|
|
|
|
if (tdep->have_linux_v1)
|
|
cb (".reg-s390-last-break", 8,
|
|
(gdbarch_ptr_bit (gdbarch) == 32
|
|
? &s390_last_break_regset : &s390x_last_break_regset),
|
|
"s930 last-break address", cb_data);
|
|
|
|
if (tdep->have_linux_v2)
|
|
cb (".reg-s390-system-call", 4, &s390_system_call_regset,
|
|
"s390 system-call", cb_data);
|
|
|
|
/* If regcache is set, we are in "write" (gcore) mode. In this
|
|
case, don't iterate over the TDB unless its registers are
|
|
available. */
|
|
if (tdep->have_tdb
|
|
&& (regcache == NULL
|
|
|| REG_VALID == regcache_register_status (regcache,
|
|
S390_TDB_DWORD0_REGNUM)))
|
|
cb (".reg-s390-tdb", s390_sizeof_tdbregset, &s390_tdb_regset,
|
|
"s390 TDB", cb_data);
|
|
|
|
if (tdep->v0_full_regnum != -1)
|
|
{
|
|
cb (".reg-s390-vxrs-low", 16 * 8, &s390_vxrs_low_regset,
|
|
"s390 vector registers 0-15 lower half", cb_data);
|
|
cb (".reg-s390-vxrs-high", 16 * 16, &s390_vxrs_high_regset,
|
|
"s390 vector registers 16-31", cb_data);
|
|
}
|
|
}
|
|
|
|
static const struct target_desc *
|
|
s390_core_read_description (struct gdbarch *gdbarch,
|
|
struct target_ops *target, bfd *abfd)
|
|
{
|
|
asection *section = bfd_get_section_by_name (abfd, ".reg");
|
|
CORE_ADDR hwcap = 0;
|
|
int high_gprs, v1, v2, te, vx;
|
|
|
|
target_auxv_search (target, AT_HWCAP, &hwcap);
|
|
if (!section)
|
|
return NULL;
|
|
|
|
high_gprs = (bfd_get_section_by_name (abfd, ".reg-s390-high-gprs")
|
|
!= NULL);
|
|
v1 = (bfd_get_section_by_name (abfd, ".reg-s390-last-break") != NULL);
|
|
v2 = (bfd_get_section_by_name (abfd, ".reg-s390-system-call") != NULL);
|
|
vx = (hwcap & HWCAP_S390_VX);
|
|
te = (hwcap & HWCAP_S390_TE);
|
|
|
|
switch (bfd_section_size (abfd, section))
|
|
{
|
|
case s390_sizeof_gregset:
|
|
if (high_gprs)
|
|
return (te && vx ? tdesc_s390_tevx_linux64 :
|
|
vx ? tdesc_s390_vx_linux64 :
|
|
te ? tdesc_s390_te_linux64 :
|
|
v2 ? tdesc_s390_linux64v2 :
|
|
v1 ? tdesc_s390_linux64v1 : tdesc_s390_linux64);
|
|
else
|
|
return (v2 ? tdesc_s390_linux32v2 :
|
|
v1 ? tdesc_s390_linux32v1 : tdesc_s390_linux32);
|
|
|
|
case s390x_sizeof_gregset:
|
|
return (te && vx ? tdesc_s390x_tevx_linux64 :
|
|
vx ? tdesc_s390x_vx_linux64 :
|
|
te ? tdesc_s390x_te_linux64 :
|
|
v2 ? tdesc_s390x_linux64v2 :
|
|
v1 ? tdesc_s390x_linux64v1 : tdesc_s390x_linux64);
|
|
|
|
default:
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
|
|
/* Decoding S/390 instructions. */
|
|
|
|
/* Named opcode values for the S/390 instructions we recognize. Some
|
|
instructions have their opcode split across two fields; those are the
|
|
op1_* and op2_* enums. */
|
|
enum
|
|
{
|
|
op1_lhi = 0xa7, op2_lhi = 0x08,
|
|
op1_lghi = 0xa7, op2_lghi = 0x09,
|
|
op1_lgfi = 0xc0, op2_lgfi = 0x01,
|
|
op_lr = 0x18,
|
|
op_lgr = 0xb904,
|
|
op_l = 0x58,
|
|
op1_ly = 0xe3, op2_ly = 0x58,
|
|
op1_lg = 0xe3, op2_lg = 0x04,
|
|
op_lm = 0x98,
|
|
op1_lmy = 0xeb, op2_lmy = 0x98,
|
|
op1_lmg = 0xeb, op2_lmg = 0x04,
|
|
op_st = 0x50,
|
|
op1_sty = 0xe3, op2_sty = 0x50,
|
|
op1_stg = 0xe3, op2_stg = 0x24,
|
|
op_std = 0x60,
|
|
op_stm = 0x90,
|
|
op1_stmy = 0xeb, op2_stmy = 0x90,
|
|
op1_stmg = 0xeb, op2_stmg = 0x24,
|
|
op1_aghi = 0xa7, op2_aghi = 0x0b,
|
|
op1_ahi = 0xa7, op2_ahi = 0x0a,
|
|
op1_agfi = 0xc2, op2_agfi = 0x08,
|
|
op1_afi = 0xc2, op2_afi = 0x09,
|
|
op1_algfi= 0xc2, op2_algfi= 0x0a,
|
|
op1_alfi = 0xc2, op2_alfi = 0x0b,
|
|
op_ar = 0x1a,
|
|
op_agr = 0xb908,
|
|
op_a = 0x5a,
|
|
op1_ay = 0xe3, op2_ay = 0x5a,
|
|
op1_ag = 0xe3, op2_ag = 0x08,
|
|
op1_slgfi= 0xc2, op2_slgfi= 0x04,
|
|
op1_slfi = 0xc2, op2_slfi = 0x05,
|
|
op_sr = 0x1b,
|
|
op_sgr = 0xb909,
|
|
op_s = 0x5b,
|
|
op1_sy = 0xe3, op2_sy = 0x5b,
|
|
op1_sg = 0xe3, op2_sg = 0x09,
|
|
op_nr = 0x14,
|
|
op_ngr = 0xb980,
|
|
op_la = 0x41,
|
|
op1_lay = 0xe3, op2_lay = 0x71,
|
|
op1_larl = 0xc0, op2_larl = 0x00,
|
|
op_basr = 0x0d,
|
|
op_bas = 0x4d,
|
|
op_bcr = 0x07,
|
|
op_bc = 0x0d,
|
|
op_bctr = 0x06,
|
|
op_bctgr = 0xb946,
|
|
op_bct = 0x46,
|
|
op1_bctg = 0xe3, op2_bctg = 0x46,
|
|
op_bxh = 0x86,
|
|
op1_bxhg = 0xeb, op2_bxhg = 0x44,
|
|
op_bxle = 0x87,
|
|
op1_bxleg= 0xeb, op2_bxleg= 0x45,
|
|
op1_bras = 0xa7, op2_bras = 0x05,
|
|
op1_brasl= 0xc0, op2_brasl= 0x05,
|
|
op1_brc = 0xa7, op2_brc = 0x04,
|
|
op1_brcl = 0xc0, op2_brcl = 0x04,
|
|
op1_brct = 0xa7, op2_brct = 0x06,
|
|
op1_brctg= 0xa7, op2_brctg= 0x07,
|
|
op_brxh = 0x84,
|
|
op1_brxhg= 0xec, op2_brxhg= 0x44,
|
|
op_brxle = 0x85,
|
|
op1_brxlg= 0xec, op2_brxlg= 0x45,
|
|
op_svc = 0x0a,
|
|
};
|
|
|
|
|
|
/* Read a single instruction from address AT. */
|
|
|
|
#define S390_MAX_INSTR_SIZE 6
|
|
static int
|
|
s390_readinstruction (bfd_byte instr[], CORE_ADDR at)
|
|
{
|
|
static int s390_instrlen[] = { 2, 4, 4, 6 };
|
|
int instrlen;
|
|
|
|
if (target_read_memory (at, &instr[0], 2))
|
|
return -1;
|
|
instrlen = s390_instrlen[instr[0] >> 6];
|
|
if (instrlen > 2)
|
|
{
|
|
if (target_read_memory (at + 2, &instr[2], instrlen - 2))
|
|
return -1;
|
|
}
|
|
return instrlen;
|
|
}
|
|
|
|
|
|
/* The functions below are for recognizing and decoding S/390
|
|
instructions of various formats. Each of them checks whether INSN
|
|
is an instruction of the given format, with the specified opcodes.
|
|
If it is, it sets the remaining arguments to the values of the
|
|
instruction's fields, and returns a non-zero value; otherwise, it
|
|
returns zero.
|
|
|
|
These functions' arguments appear in the order they appear in the
|
|
instruction, not in the machine-language form. So, opcodes always
|
|
come first, even though they're sometimes scattered around the
|
|
instructions. And displacements appear before base and extension
|
|
registers, as they do in the assembly syntax, not at the end, as
|
|
they do in the machine language. */
|
|
static int
|
|
is_ri (bfd_byte *insn, int op1, int op2, unsigned int *r1, int *i2)
|
|
{
|
|
if (insn[0] == op1 && (insn[1] & 0xf) == op2)
|
|
{
|
|
*r1 = (insn[1] >> 4) & 0xf;
|
|
/* i2 is a 16-bit signed quantity. */
|
|
*i2 = (((insn[2] << 8) | insn[3]) ^ 0x8000) - 0x8000;
|
|
return 1;
|
|
}
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int
|
|
is_ril (bfd_byte *insn, int op1, int op2,
|
|
unsigned int *r1, int *i2)
|
|
{
|
|
if (insn[0] == op1 && (insn[1] & 0xf) == op2)
|
|
{
|
|
*r1 = (insn[1] >> 4) & 0xf;
|
|
/* i2 is a signed quantity. If the host 'int' is 32 bits long,
|
|
no sign extension is necessary, but we don't want to assume
|
|
that. */
|
|
*i2 = (((insn[2] << 24)
|
|
| (insn[3] << 16)
|
|
| (insn[4] << 8)
|
|
| (insn[5])) ^ 0x80000000) - 0x80000000;
|
|
return 1;
|
|
}
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int
|
|
is_rr (bfd_byte *insn, int op, unsigned int *r1, unsigned int *r2)
|
|
{
|
|
if (insn[0] == op)
|
|
{
|
|
*r1 = (insn[1] >> 4) & 0xf;
|
|
*r2 = insn[1] & 0xf;
|
|
return 1;
|
|
}
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int
|
|
is_rre (bfd_byte *insn, int op, unsigned int *r1, unsigned int *r2)
|
|
{
|
|
if (((insn[0] << 8) | insn[1]) == op)
|
|
{
|
|
/* Yes, insn[3]. insn[2] is unused in RRE format. */
|
|
*r1 = (insn[3] >> 4) & 0xf;
|
|
*r2 = insn[3] & 0xf;
|
|
return 1;
|
|
}
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int
|
|
is_rs (bfd_byte *insn, int op,
|
|
unsigned int *r1, unsigned int *r3, int *d2, unsigned int *b2)
|
|
{
|
|
if (insn[0] == op)
|
|
{
|
|
*r1 = (insn[1] >> 4) & 0xf;
|
|
*r3 = insn[1] & 0xf;
|
|
*b2 = (insn[2] >> 4) & 0xf;
|
|
*d2 = ((insn[2] & 0xf) << 8) | insn[3];
|
|
return 1;
|
|
}
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int
|
|
is_rsy (bfd_byte *insn, int op1, int op2,
|
|
unsigned int *r1, unsigned int *r3, int *d2, unsigned int *b2)
|
|
{
|
|
if (insn[0] == op1
|
|
&& insn[5] == op2)
|
|
{
|
|
*r1 = (insn[1] >> 4) & 0xf;
|
|
*r3 = insn[1] & 0xf;
|
|
*b2 = (insn[2] >> 4) & 0xf;
|
|
/* The 'long displacement' is a 20-bit signed integer. */
|
|
*d2 = ((((insn[2] & 0xf) << 8) | insn[3] | (insn[4] << 12))
|
|
^ 0x80000) - 0x80000;
|
|
return 1;
|
|
}
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int
|
|
is_rsi (bfd_byte *insn, int op,
|
|
unsigned int *r1, unsigned int *r3, int *i2)
|
|
{
|
|
if (insn[0] == op)
|
|
{
|
|
*r1 = (insn[1] >> 4) & 0xf;
|
|
*r3 = insn[1] & 0xf;
|
|
/* i2 is a 16-bit signed quantity. */
|
|
*i2 = (((insn[2] << 8) | insn[3]) ^ 0x8000) - 0x8000;
|
|
return 1;
|
|
}
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int
|
|
is_rie (bfd_byte *insn, int op1, int op2,
|
|
unsigned int *r1, unsigned int *r3, int *i2)
|
|
{
|
|
if (insn[0] == op1
|
|
&& insn[5] == op2)
|
|
{
|
|
*r1 = (insn[1] >> 4) & 0xf;
|
|
*r3 = insn[1] & 0xf;
|
|
/* i2 is a 16-bit signed quantity. */
|
|
*i2 = (((insn[2] << 8) | insn[3]) ^ 0x8000) - 0x8000;
|
|
return 1;
|
|
}
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int
|
|
is_rx (bfd_byte *insn, int op,
|
|
unsigned int *r1, int *d2, unsigned int *x2, unsigned int *b2)
|
|
{
|
|
if (insn[0] == op)
|
|
{
|
|
*r1 = (insn[1] >> 4) & 0xf;
|
|
*x2 = insn[1] & 0xf;
|
|
*b2 = (insn[2] >> 4) & 0xf;
|
|
*d2 = ((insn[2] & 0xf) << 8) | insn[3];
|
|
return 1;
|
|
}
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int
|
|
is_rxy (bfd_byte *insn, int op1, int op2,
|
|
unsigned int *r1, int *d2, unsigned int *x2, unsigned int *b2)
|
|
{
|
|
if (insn[0] == op1
|
|
&& insn[5] == op2)
|
|
{
|
|
*r1 = (insn[1] >> 4) & 0xf;
|
|
*x2 = insn[1] & 0xf;
|
|
*b2 = (insn[2] >> 4) & 0xf;
|
|
/* The 'long displacement' is a 20-bit signed integer. */
|
|
*d2 = ((((insn[2] & 0xf) << 8) | insn[3] | (insn[4] << 12))
|
|
^ 0x80000) - 0x80000;
|
|
return 1;
|
|
}
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* Prologue analysis. */
|
|
|
|
#define S390_NUM_GPRS 16
|
|
#define S390_NUM_FPRS 16
|
|
|
|
struct s390_prologue_data {
|
|
|
|
/* The stack. */
|
|
struct pv_area *stack;
|
|
|
|
/* The size and byte-order of a GPR or FPR. */
|
|
int gpr_size;
|
|
int fpr_size;
|
|
enum bfd_endian byte_order;
|
|
|
|
/* The general-purpose registers. */
|
|
pv_t gpr[S390_NUM_GPRS];
|
|
|
|
/* The floating-point registers. */
|
|
pv_t fpr[S390_NUM_FPRS];
|
|
|
|
/* The offset relative to the CFA where the incoming GPR N was saved
|
|
by the function prologue. 0 if not saved or unknown. */
|
|
int gpr_slot[S390_NUM_GPRS];
|
|
|
|
/* Likewise for FPRs. */
|
|
int fpr_slot[S390_NUM_FPRS];
|
|
|
|
/* Nonzero if the backchain was saved. This is assumed to be the
|
|
case when the incoming SP is saved at the current SP location. */
|
|
int back_chain_saved_p;
|
|
};
|
|
|
|
/* Return the effective address for an X-style instruction, like:
|
|
|
|
L R1, D2(X2, B2)
|
|
|
|
Here, X2 and B2 are registers, and D2 is a signed 20-bit
|
|
constant; the effective address is the sum of all three. If either
|
|
X2 or B2 are zero, then it doesn't contribute to the sum --- this
|
|
means that r0 can't be used as either X2 or B2. */
|
|
static pv_t
|
|
s390_addr (struct s390_prologue_data *data,
|
|
int d2, unsigned int x2, unsigned int b2)
|
|
{
|
|
pv_t result;
|
|
|
|
result = pv_constant (d2);
|
|
if (x2)
|
|
result = pv_add (result, data->gpr[x2]);
|
|
if (b2)
|
|
result = pv_add (result, data->gpr[b2]);
|
|
|
|
return result;
|
|
}
|
|
|
|
/* Do a SIZE-byte store of VALUE to D2(X2,B2). */
|
|
static void
|
|
s390_store (struct s390_prologue_data *data,
|
|
int d2, unsigned int x2, unsigned int b2, CORE_ADDR size,
|
|
pv_t value)
|
|
{
|
|
pv_t addr = s390_addr (data, d2, x2, b2);
|
|
pv_t offset;
|
|
|
|
/* Check whether we are storing the backchain. */
|
|
offset = pv_subtract (data->gpr[S390_SP_REGNUM - S390_R0_REGNUM], addr);
|
|
|
|
if (pv_is_constant (offset) && offset.k == 0)
|
|
if (size == data->gpr_size
|
|
&& pv_is_register_k (value, S390_SP_REGNUM, 0))
|
|
{
|
|
data->back_chain_saved_p = 1;
|
|
return;
|
|
}
|
|
|
|
|
|
/* Check whether we are storing a register into the stack. */
|
|
if (!pv_area_store_would_trash (data->stack, addr))
|
|
pv_area_store (data->stack, addr, size, value);
|
|
|
|
|
|
/* Note: If this is some store we cannot identify, you might think we
|
|
should forget our cached values, as any of those might have been hit.
|
|
|
|
However, we make the assumption that the register save areas are only
|
|
ever stored to once in any given function, and we do recognize these
|
|
stores. Thus every store we cannot recognize does not hit our data. */
|
|
}
|
|
|
|
/* Do a SIZE-byte load from D2(X2,B2). */
|
|
static pv_t
|
|
s390_load (struct s390_prologue_data *data,
|
|
int d2, unsigned int x2, unsigned int b2, CORE_ADDR size)
|
|
|
|
{
|
|
pv_t addr = s390_addr (data, d2, x2, b2);
|
|
|
|
/* If it's a load from an in-line constant pool, then we can
|
|
simulate that, under the assumption that the code isn't
|
|
going to change between the time the processor actually
|
|
executed it creating the current frame, and the time when
|
|
we're analyzing the code to unwind past that frame. */
|
|
if (pv_is_constant (addr))
|
|
{
|
|
struct target_section *secp;
|
|
secp = target_section_by_addr (¤t_target, addr.k);
|
|
if (secp != NULL
|
|
&& (bfd_get_section_flags (secp->the_bfd_section->owner,
|
|
secp->the_bfd_section)
|
|
& SEC_READONLY))
|
|
return pv_constant (read_memory_integer (addr.k, size,
|
|
data->byte_order));
|
|
}
|
|
|
|
/* Check whether we are accessing one of our save slots. */
|
|
return pv_area_fetch (data->stack, addr, size);
|
|
}
|
|
|
|
/* Function for finding saved registers in a 'struct pv_area'; we pass
|
|
this to pv_area_scan.
|
|
|
|
If VALUE is a saved register, ADDR says it was saved at a constant
|
|
offset from the frame base, and SIZE indicates that the whole
|
|
register was saved, record its offset in the reg_offset table in
|
|
PROLOGUE_UNTYPED. */
|
|
static void
|
|
s390_check_for_saved (void *data_untyped, pv_t addr,
|
|
CORE_ADDR size, pv_t value)
|
|
{
|
|
struct s390_prologue_data *data = data_untyped;
|
|
int i, offset;
|
|
|
|
if (!pv_is_register (addr, S390_SP_REGNUM))
|
|
return;
|
|
|
|
offset = 16 * data->gpr_size + 32 - addr.k;
|
|
|
|
/* If we are storing the original value of a register, we want to
|
|
record the CFA offset. If the same register is stored multiple
|
|
times, the stack slot with the highest address counts. */
|
|
|
|
for (i = 0; i < S390_NUM_GPRS; i++)
|
|
if (size == data->gpr_size
|
|
&& pv_is_register_k (value, S390_R0_REGNUM + i, 0))
|
|
if (data->gpr_slot[i] == 0
|
|
|| data->gpr_slot[i] > offset)
|
|
{
|
|
data->gpr_slot[i] = offset;
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i < S390_NUM_FPRS; i++)
|
|
if (size == data->fpr_size
|
|
&& pv_is_register_k (value, S390_F0_REGNUM + i, 0))
|
|
if (data->fpr_slot[i] == 0
|
|
|| data->fpr_slot[i] > offset)
|
|
{
|
|
data->fpr_slot[i] = offset;
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* Analyze the prologue of the function starting at START_PC,
|
|
continuing at most until CURRENT_PC. Initialize DATA to
|
|
hold all information we find out about the state of the registers
|
|
and stack slots. Return the address of the instruction after
|
|
the last one that changed the SP, FP, or back chain; or zero
|
|
on error. */
|
|
static CORE_ADDR
|
|
s390_analyze_prologue (struct gdbarch *gdbarch,
|
|
CORE_ADDR start_pc,
|
|
CORE_ADDR current_pc,
|
|
struct s390_prologue_data *data)
|
|
{
|
|
int word_size = gdbarch_ptr_bit (gdbarch) / 8;
|
|
|
|
/* Our return value:
|
|
The address of the instruction after the last one that changed
|
|
the SP, FP, or back chain; zero if we got an error trying to
|
|
read memory. */
|
|
CORE_ADDR result = start_pc;
|
|
|
|
/* The current PC for our abstract interpretation. */
|
|
CORE_ADDR pc;
|
|
|
|
/* The address of the next instruction after that. */
|
|
CORE_ADDR next_pc;
|
|
|
|
/* Set up everything's initial value. */
|
|
{
|
|
int i;
|
|
|
|
data->stack = make_pv_area (S390_SP_REGNUM, gdbarch_addr_bit (gdbarch));
|
|
|
|
/* For the purpose of prologue tracking, we consider the GPR size to
|
|
be equal to the ABI word size, even if it is actually larger
|
|
(i.e. when running a 32-bit binary under a 64-bit kernel). */
|
|
data->gpr_size = word_size;
|
|
data->fpr_size = 8;
|
|
data->byte_order = gdbarch_byte_order (gdbarch);
|
|
|
|
for (i = 0; i < S390_NUM_GPRS; i++)
|
|
data->gpr[i] = pv_register (S390_R0_REGNUM + i, 0);
|
|
|
|
for (i = 0; i < S390_NUM_FPRS; i++)
|
|
data->fpr[i] = pv_register (S390_F0_REGNUM + i, 0);
|
|
|
|
for (i = 0; i < S390_NUM_GPRS; i++)
|
|
data->gpr_slot[i] = 0;
|
|
|
|
for (i = 0; i < S390_NUM_FPRS; i++)
|
|
data->fpr_slot[i] = 0;
|
|
|
|
data->back_chain_saved_p = 0;
|
|
}
|
|
|
|
/* Start interpreting instructions, until we hit the frame's
|
|
current PC or the first branch instruction. */
|
|
for (pc = start_pc; pc > 0 && pc < current_pc; pc = next_pc)
|
|
{
|
|
bfd_byte insn[S390_MAX_INSTR_SIZE];
|
|
int insn_len = s390_readinstruction (insn, pc);
|
|
|
|
bfd_byte dummy[S390_MAX_INSTR_SIZE] = { 0 };
|
|
bfd_byte *insn32 = word_size == 4 ? insn : dummy;
|
|
bfd_byte *insn64 = word_size == 8 ? insn : dummy;
|
|
|
|
/* Fields for various kinds of instructions. */
|
|
unsigned int b2, r1, r2, x2, r3;
|
|
int i2, d2;
|
|
|
|
/* The values of SP and FP before this instruction,
|
|
for detecting instructions that change them. */
|
|
pv_t pre_insn_sp, pre_insn_fp;
|
|
/* Likewise for the flag whether the back chain was saved. */
|
|
int pre_insn_back_chain_saved_p;
|
|
|
|
/* If we got an error trying to read the instruction, report it. */
|
|
if (insn_len < 0)
|
|
{
|
|
result = 0;
|
|
break;
|
|
}
|
|
|
|
next_pc = pc + insn_len;
|
|
|
|
pre_insn_sp = data->gpr[S390_SP_REGNUM - S390_R0_REGNUM];
|
|
pre_insn_fp = data->gpr[S390_FRAME_REGNUM - S390_R0_REGNUM];
|
|
pre_insn_back_chain_saved_p = data->back_chain_saved_p;
|
|
|
|
|
|
/* LHI r1, i2 --- load halfword immediate. */
|
|
/* LGHI r1, i2 --- load halfword immediate (64-bit version). */
|
|
/* LGFI r1, i2 --- load fullword immediate. */
|
|
if (is_ri (insn32, op1_lhi, op2_lhi, &r1, &i2)
|
|
|| is_ri (insn64, op1_lghi, op2_lghi, &r1, &i2)
|
|
|| is_ril (insn, op1_lgfi, op2_lgfi, &r1, &i2))
|
|
data->gpr[r1] = pv_constant (i2);
|
|
|
|
/* LR r1, r2 --- load from register. */
|
|
/* LGR r1, r2 --- load from register (64-bit version). */
|
|
else if (is_rr (insn32, op_lr, &r1, &r2)
|
|
|| is_rre (insn64, op_lgr, &r1, &r2))
|
|
data->gpr[r1] = data->gpr[r2];
|
|
|
|
/* L r1, d2(x2, b2) --- load. */
|
|
/* LY r1, d2(x2, b2) --- load (long-displacement version). */
|
|
/* LG r1, d2(x2, b2) --- load (64-bit version). */
|
|
else if (is_rx (insn32, op_l, &r1, &d2, &x2, &b2)
|
|
|| is_rxy (insn32, op1_ly, op2_ly, &r1, &d2, &x2, &b2)
|
|
|| is_rxy (insn64, op1_lg, op2_lg, &r1, &d2, &x2, &b2))
|
|
data->gpr[r1] = s390_load (data, d2, x2, b2, data->gpr_size);
|
|
|
|
/* ST r1, d2(x2, b2) --- store. */
|
|
/* STY r1, d2(x2, b2) --- store (long-displacement version). */
|
|
/* STG r1, d2(x2, b2) --- store (64-bit version). */
|
|
else if (is_rx (insn32, op_st, &r1, &d2, &x2, &b2)
|
|
|| is_rxy (insn32, op1_sty, op2_sty, &r1, &d2, &x2, &b2)
|
|
|| is_rxy (insn64, op1_stg, op2_stg, &r1, &d2, &x2, &b2))
|
|
s390_store (data, d2, x2, b2, data->gpr_size, data->gpr[r1]);
|
|
|
|
/* STD r1, d2(x2,b2) --- store floating-point register. */
|
|
else if (is_rx (insn, op_std, &r1, &d2, &x2, &b2))
|
|
s390_store (data, d2, x2, b2, data->fpr_size, data->fpr[r1]);
|
|
|
|
/* STM r1, r3, d2(b2) --- store multiple. */
|
|
/* STMY r1, r3, d2(b2) --- store multiple (long-displacement
|
|
version). */
|
|
/* STMG r1, r3, d2(b2) --- store multiple (64-bit version). */
|
|
else if (is_rs (insn32, op_stm, &r1, &r3, &d2, &b2)
|
|
|| is_rsy (insn32, op1_stmy, op2_stmy, &r1, &r3, &d2, &b2)
|
|
|| is_rsy (insn64, op1_stmg, op2_stmg, &r1, &r3, &d2, &b2))
|
|
{
|
|
for (; r1 <= r3; r1++, d2 += data->gpr_size)
|
|
s390_store (data, d2, 0, b2, data->gpr_size, data->gpr[r1]);
|
|
}
|
|
|
|
/* AHI r1, i2 --- add halfword immediate. */
|
|
/* AGHI r1, i2 --- add halfword immediate (64-bit version). */
|
|
/* AFI r1, i2 --- add fullword immediate. */
|
|
/* AGFI r1, i2 --- add fullword immediate (64-bit version). */
|
|
else if (is_ri (insn32, op1_ahi, op2_ahi, &r1, &i2)
|
|
|| is_ri (insn64, op1_aghi, op2_aghi, &r1, &i2)
|
|
|| is_ril (insn32, op1_afi, op2_afi, &r1, &i2)
|
|
|| is_ril (insn64, op1_agfi, op2_agfi, &r1, &i2))
|
|
data->gpr[r1] = pv_add_constant (data->gpr[r1], i2);
|
|
|
|
/* ALFI r1, i2 --- add logical immediate. */
|
|
/* ALGFI r1, i2 --- add logical immediate (64-bit version). */
|
|
else if (is_ril (insn32, op1_alfi, op2_alfi, &r1, &i2)
|
|
|| is_ril (insn64, op1_algfi, op2_algfi, &r1, &i2))
|
|
data->gpr[r1] = pv_add_constant (data->gpr[r1],
|
|
(CORE_ADDR)i2 & 0xffffffff);
|
|
|
|
/* AR r1, r2 -- add register. */
|
|
/* AGR r1, r2 -- add register (64-bit version). */
|
|
else if (is_rr (insn32, op_ar, &r1, &r2)
|
|
|| is_rre (insn64, op_agr, &r1, &r2))
|
|
data->gpr[r1] = pv_add (data->gpr[r1], data->gpr[r2]);
|
|
|
|
/* A r1, d2(x2, b2) -- add. */
|
|
/* AY r1, d2(x2, b2) -- add (long-displacement version). */
|
|
/* AG r1, d2(x2, b2) -- add (64-bit version). */
|
|
else if (is_rx (insn32, op_a, &r1, &d2, &x2, &b2)
|
|
|| is_rxy (insn32, op1_ay, op2_ay, &r1, &d2, &x2, &b2)
|
|
|| is_rxy (insn64, op1_ag, op2_ag, &r1, &d2, &x2, &b2))
|
|
data->gpr[r1] = pv_add (data->gpr[r1],
|
|
s390_load (data, d2, x2, b2, data->gpr_size));
|
|
|
|
/* SLFI r1, i2 --- subtract logical immediate. */
|
|
/* SLGFI r1, i2 --- subtract logical immediate (64-bit version). */
|
|
else if (is_ril (insn32, op1_slfi, op2_slfi, &r1, &i2)
|
|
|| is_ril (insn64, op1_slgfi, op2_slgfi, &r1, &i2))
|
|
data->gpr[r1] = pv_add_constant (data->gpr[r1],
|
|
-((CORE_ADDR)i2 & 0xffffffff));
|
|
|
|
/* SR r1, r2 -- subtract register. */
|
|
/* SGR r1, r2 -- subtract register (64-bit version). */
|
|
else if (is_rr (insn32, op_sr, &r1, &r2)
|
|
|| is_rre (insn64, op_sgr, &r1, &r2))
|
|
data->gpr[r1] = pv_subtract (data->gpr[r1], data->gpr[r2]);
|
|
|
|
/* S r1, d2(x2, b2) -- subtract. */
|
|
/* SY r1, d2(x2, b2) -- subtract (long-displacement version). */
|
|
/* SG r1, d2(x2, b2) -- subtract (64-bit version). */
|
|
else if (is_rx (insn32, op_s, &r1, &d2, &x2, &b2)
|
|
|| is_rxy (insn32, op1_sy, op2_sy, &r1, &d2, &x2, &b2)
|
|
|| is_rxy (insn64, op1_sg, op2_sg, &r1, &d2, &x2, &b2))
|
|
data->gpr[r1] = pv_subtract (data->gpr[r1],
|
|
s390_load (data, d2, x2, b2, data->gpr_size));
|
|
|
|
/* LA r1, d2(x2, b2) --- load address. */
|
|
/* LAY r1, d2(x2, b2) --- load address (long-displacement version). */
|
|
else if (is_rx (insn, op_la, &r1, &d2, &x2, &b2)
|
|
|| is_rxy (insn, op1_lay, op2_lay, &r1, &d2, &x2, &b2))
|
|
data->gpr[r1] = s390_addr (data, d2, x2, b2);
|
|
|
|
/* LARL r1, i2 --- load address relative long. */
|
|
else if (is_ril (insn, op1_larl, op2_larl, &r1, &i2))
|
|
data->gpr[r1] = pv_constant (pc + i2 * 2);
|
|
|
|
/* BASR r1, 0 --- branch and save.
|
|
Since r2 is zero, this saves the PC in r1, but doesn't branch. */
|
|
else if (is_rr (insn, op_basr, &r1, &r2)
|
|
&& r2 == 0)
|
|
data->gpr[r1] = pv_constant (next_pc);
|
|
|
|
/* BRAS r1, i2 --- branch relative and save. */
|
|
else if (is_ri (insn, op1_bras, op2_bras, &r1, &i2))
|
|
{
|
|
data->gpr[r1] = pv_constant (next_pc);
|
|
next_pc = pc + i2 * 2;
|
|
|
|
/* We'd better not interpret any backward branches. We'll
|
|
never terminate. */
|
|
if (next_pc <= pc)
|
|
break;
|
|
}
|
|
|
|
/* Terminate search when hitting any other branch instruction. */
|
|
else if (is_rr (insn, op_basr, &r1, &r2)
|
|
|| is_rx (insn, op_bas, &r1, &d2, &x2, &b2)
|
|
|| is_rr (insn, op_bcr, &r1, &r2)
|
|
|| is_rx (insn, op_bc, &r1, &d2, &x2, &b2)
|
|
|| is_ri (insn, op1_brc, op2_brc, &r1, &i2)
|
|
|| is_ril (insn, op1_brcl, op2_brcl, &r1, &i2)
|
|
|| is_ril (insn, op1_brasl, op2_brasl, &r2, &i2))
|
|
break;
|
|
|
|
else
|
|
{
|
|
/* An instruction we don't know how to simulate. The only
|
|
safe thing to do would be to set every value we're tracking
|
|
to 'unknown'. Instead, we'll be optimistic: we assume that
|
|
we *can* interpret every instruction that the compiler uses
|
|
to manipulate any of the data we're interested in here --
|
|
then we can just ignore anything else. */
|
|
}
|
|
|
|
/* Record the address after the last instruction that changed
|
|
the FP, SP, or backlink. Ignore instructions that changed
|
|
them back to their original values --- those are probably
|
|
restore instructions. (The back chain is never restored,
|
|
just popped.) */
|
|
{
|
|
pv_t sp = data->gpr[S390_SP_REGNUM - S390_R0_REGNUM];
|
|
pv_t fp = data->gpr[S390_FRAME_REGNUM - S390_R0_REGNUM];
|
|
|
|
if ((! pv_is_identical (pre_insn_sp, sp)
|
|
&& ! pv_is_register_k (sp, S390_SP_REGNUM, 0)
|
|
&& sp.kind != pvk_unknown)
|
|
|| (! pv_is_identical (pre_insn_fp, fp)
|
|
&& ! pv_is_register_k (fp, S390_FRAME_REGNUM, 0)
|
|
&& fp.kind != pvk_unknown)
|
|
|| pre_insn_back_chain_saved_p != data->back_chain_saved_p)
|
|
result = next_pc;
|
|
}
|
|
}
|
|
|
|
/* Record where all the registers were saved. */
|
|
pv_area_scan (data->stack, s390_check_for_saved, data);
|
|
|
|
free_pv_area (data->stack);
|
|
data->stack = NULL;
|
|
|
|
return result;
|
|
}
|
|
|
|
/* Advance PC across any function entry prologue instructions to reach
|
|
some "real" code. */
|
|
static CORE_ADDR
|
|
s390_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
|
|
{
|
|
struct s390_prologue_data data;
|
|
CORE_ADDR skip_pc, func_addr;
|
|
|
|
if (find_pc_partial_function (pc, NULL, &func_addr, NULL))
|
|
{
|
|
CORE_ADDR post_prologue_pc
|
|
= skip_prologue_using_sal (gdbarch, func_addr);
|
|
if (post_prologue_pc != 0)
|
|
return max (pc, post_prologue_pc);
|
|
}
|
|
|
|
skip_pc = s390_analyze_prologue (gdbarch, pc, (CORE_ADDR)-1, &data);
|
|
return skip_pc ? skip_pc : pc;
|
|
}
|
|
|
|
/* Implmement the stack_frame_destroyed_p gdbarch method. */
|
|
static int
|
|
s390_stack_frame_destroyed_p (struct gdbarch *gdbarch, CORE_ADDR pc)
|
|
{
|
|
int word_size = gdbarch_ptr_bit (gdbarch) / 8;
|
|
|
|
/* In frameless functions, there's not frame to destroy and thus
|
|
we don't care about the epilogue.
|
|
|
|
In functions with frame, the epilogue sequence is a pair of
|
|
a LM-type instruction that restores (amongst others) the
|
|
return register %r14 and the stack pointer %r15, followed
|
|
by a branch 'br %r14' --or equivalent-- that effects the
|
|
actual return.
|
|
|
|
In that situation, this function needs to return 'true' in
|
|
exactly one case: when pc points to that branch instruction.
|
|
|
|
Thus we try to disassemble the one instructions immediately
|
|
preceding pc and check whether it is an LM-type instruction
|
|
modifying the stack pointer.
|
|
|
|
Note that disassembling backwards is not reliable, so there
|
|
is a slight chance of false positives here ... */
|
|
|
|
bfd_byte insn[6];
|
|
unsigned int r1, r3, b2;
|
|
int d2;
|
|
|
|
if (word_size == 4
|
|
&& !target_read_memory (pc - 4, insn, 4)
|
|
&& is_rs (insn, op_lm, &r1, &r3, &d2, &b2)
|
|
&& r3 == S390_SP_REGNUM - S390_R0_REGNUM)
|
|
return 1;
|
|
|
|
if (word_size == 4
|
|
&& !target_read_memory (pc - 6, insn, 6)
|
|
&& is_rsy (insn, op1_lmy, op2_lmy, &r1, &r3, &d2, &b2)
|
|
&& r3 == S390_SP_REGNUM - S390_R0_REGNUM)
|
|
return 1;
|
|
|
|
if (word_size == 8
|
|
&& !target_read_memory (pc - 6, insn, 6)
|
|
&& is_rsy (insn, op1_lmg, op2_lmg, &r1, &r3, &d2, &b2)
|
|
&& r3 == S390_SP_REGNUM - S390_R0_REGNUM)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Displaced stepping. */
|
|
|
|
/* Fix up the state of registers and memory after having single-stepped
|
|
a displaced instruction. */
|
|
static void
|
|
s390_displaced_step_fixup (struct gdbarch *gdbarch,
|
|
struct displaced_step_closure *closure,
|
|
CORE_ADDR from, CORE_ADDR to,
|
|
struct regcache *regs)
|
|
{
|
|
/* Since we use simple_displaced_step_copy_insn, our closure is a
|
|
copy of the instruction. */
|
|
gdb_byte *insn = (gdb_byte *) closure;
|
|
static int s390_instrlen[] = { 2, 4, 4, 6 };
|
|
int insnlen = s390_instrlen[insn[0] >> 6];
|
|
|
|
/* Fields for various kinds of instructions. */
|
|
unsigned int b2, r1, r2, x2, r3;
|
|
int i2, d2;
|
|
|
|
/* Get current PC and addressing mode bit. */
|
|
CORE_ADDR pc = regcache_read_pc (regs);
|
|
ULONGEST amode = 0;
|
|
|
|
if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)
|
|
{
|
|
regcache_cooked_read_unsigned (regs, S390_PSWA_REGNUM, &amode);
|
|
amode &= 0x80000000;
|
|
}
|
|
|
|
if (debug_displaced)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
"displaced: (s390) fixup (%s, %s) pc %s len %d amode 0x%x\n",
|
|
paddress (gdbarch, from), paddress (gdbarch, to),
|
|
paddress (gdbarch, pc), insnlen, (int) amode);
|
|
|
|
/* Handle absolute branch and save instructions. */
|
|
if (is_rr (insn, op_basr, &r1, &r2)
|
|
|| is_rx (insn, op_bas, &r1, &d2, &x2, &b2))
|
|
{
|
|
/* Recompute saved return address in R1. */
|
|
regcache_cooked_write_unsigned (regs, S390_R0_REGNUM + r1,
|
|
amode | (from + insnlen));
|
|
}
|
|
|
|
/* Handle absolute branch instructions. */
|
|
else if (is_rr (insn, op_bcr, &r1, &r2)
|
|
|| is_rx (insn, op_bc, &r1, &d2, &x2, &b2)
|
|
|| is_rr (insn, op_bctr, &r1, &r2)
|
|
|| is_rre (insn, op_bctgr, &r1, &r2)
|
|
|| is_rx (insn, op_bct, &r1, &d2, &x2, &b2)
|
|
|| is_rxy (insn, op1_bctg, op2_brctg, &r1, &d2, &x2, &b2)
|
|
|| is_rs (insn, op_bxh, &r1, &r3, &d2, &b2)
|
|
|| is_rsy (insn, op1_bxhg, op2_bxhg, &r1, &r3, &d2, &b2)
|
|
|| is_rs (insn, op_bxle, &r1, &r3, &d2, &b2)
|
|
|| is_rsy (insn, op1_bxleg, op2_bxleg, &r1, &r3, &d2, &b2))
|
|
{
|
|
/* Update PC iff branch was *not* taken. */
|
|
if (pc == to + insnlen)
|
|
regcache_write_pc (regs, from + insnlen);
|
|
}
|
|
|
|
/* Handle PC-relative branch and save instructions. */
|
|
else if (is_ri (insn, op1_bras, op2_bras, &r1, &i2)
|
|
|| is_ril (insn, op1_brasl, op2_brasl, &r1, &i2))
|
|
{
|
|
/* Update PC. */
|
|
regcache_write_pc (regs, pc - to + from);
|
|
/* Recompute saved return address in R1. */
|
|
regcache_cooked_write_unsigned (regs, S390_R0_REGNUM + r1,
|
|
amode | (from + insnlen));
|
|
}
|
|
|
|
/* Handle PC-relative branch instructions. */
|
|
else if (is_ri (insn, op1_brc, op2_brc, &r1, &i2)
|
|
|| is_ril (insn, op1_brcl, op2_brcl, &r1, &i2)
|
|
|| is_ri (insn, op1_brct, op2_brct, &r1, &i2)
|
|
|| is_ri (insn, op1_brctg, op2_brctg, &r1, &i2)
|
|
|| is_rsi (insn, op_brxh, &r1, &r3, &i2)
|
|
|| is_rie (insn, op1_brxhg, op2_brxhg, &r1, &r3, &i2)
|
|
|| is_rsi (insn, op_brxle, &r1, &r3, &i2)
|
|
|| is_rie (insn, op1_brxlg, op2_brxlg, &r1, &r3, &i2))
|
|
{
|
|
/* Update PC. */
|
|
regcache_write_pc (regs, pc - to + from);
|
|
}
|
|
|
|
/* Handle LOAD ADDRESS RELATIVE LONG. */
|
|
else if (is_ril (insn, op1_larl, op2_larl, &r1, &i2))
|
|
{
|
|
/* Update PC. */
|
|
regcache_write_pc (regs, from + insnlen);
|
|
/* Recompute output address in R1. */
|
|
regcache_cooked_write_unsigned (regs, S390_R0_REGNUM + r1,
|
|
amode | (from + i2 * 2));
|
|
}
|
|
|
|
/* If we executed a breakpoint instruction, point PC right back at it. */
|
|
else if (insn[0] == 0x0 && insn[1] == 0x1)
|
|
regcache_write_pc (regs, from);
|
|
|
|
/* For any other insn, PC points right after the original instruction. */
|
|
else
|
|
regcache_write_pc (regs, from + insnlen);
|
|
|
|
if (debug_displaced)
|
|
fprintf_unfiltered (gdb_stdlog,
|
|
"displaced: (s390) pc is now %s\n",
|
|
paddress (gdbarch, regcache_read_pc (regs)));
|
|
}
|
|
|
|
|
|
/* Helper routine to unwind pseudo registers. */
|
|
|
|
static struct value *
|
|
s390_unwind_pseudo_register (struct frame_info *this_frame, int regnum)
|
|
{
|
|
struct gdbarch *gdbarch = get_frame_arch (this_frame);
|
|
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
|
struct type *type = register_type (gdbarch, regnum);
|
|
|
|
/* Unwind PC via PSW address. */
|
|
if (regnum == tdep->pc_regnum)
|
|
{
|
|
struct value *val;
|
|
|
|
val = frame_unwind_register_value (this_frame, S390_PSWA_REGNUM);
|
|
if (!value_optimized_out (val))
|
|
{
|
|
LONGEST pswa = value_as_long (val);
|
|
|
|
if (TYPE_LENGTH (type) == 4)
|
|
return value_from_pointer (type, pswa & 0x7fffffff);
|
|
else
|
|
return value_from_pointer (type, pswa);
|
|
}
|
|
}
|
|
|
|
/* Unwind CC via PSW mask. */
|
|
if (regnum == tdep->cc_regnum)
|
|
{
|
|
struct value *val;
|
|
|
|
val = frame_unwind_register_value (this_frame, S390_PSWM_REGNUM);
|
|
if (!value_optimized_out (val))
|
|
{
|
|
LONGEST pswm = value_as_long (val);
|
|
|
|
if (TYPE_LENGTH (type) == 4)
|
|
return value_from_longest (type, (pswm >> 12) & 3);
|
|
else
|
|
return value_from_longest (type, (pswm >> 44) & 3);
|
|
}
|
|
}
|
|
|
|
/* Unwind full GPRs to show at least the lower halves (as the
|
|
upper halves are undefined). */
|
|
if (regnum_is_gpr_full (tdep, regnum))
|
|
{
|
|
int reg = regnum - tdep->gpr_full_regnum;
|
|
struct value *val;
|
|
|
|
val = frame_unwind_register_value (this_frame, S390_R0_REGNUM + reg);
|
|
if (!value_optimized_out (val))
|
|
return value_cast (type, val);
|
|
}
|
|
|
|
return allocate_optimized_out_value (type);
|
|
}
|
|
|
|
static struct value *
|
|
s390_trad_frame_prev_register (struct frame_info *this_frame,
|
|
struct trad_frame_saved_reg saved_regs[],
|
|
int regnum)
|
|
{
|
|
if (regnum < S390_NUM_REGS)
|
|
return trad_frame_get_prev_register (this_frame, saved_regs, regnum);
|
|
else
|
|
return s390_unwind_pseudo_register (this_frame, regnum);
|
|
}
|
|
|
|
|
|
/* Normal stack frames. */
|
|
|
|
struct s390_unwind_cache {
|
|
|
|
CORE_ADDR func;
|
|
CORE_ADDR frame_base;
|
|
CORE_ADDR local_base;
|
|
|
|
struct trad_frame_saved_reg *saved_regs;
|
|
};
|
|
|
|
static int
|
|
s390_prologue_frame_unwind_cache (struct frame_info *this_frame,
|
|
struct s390_unwind_cache *info)
|
|
{
|
|
struct gdbarch *gdbarch = get_frame_arch (this_frame);
|
|
int word_size = gdbarch_ptr_bit (gdbarch) / 8;
|
|
struct s390_prologue_data data;
|
|
pv_t *fp = &data.gpr[S390_FRAME_REGNUM - S390_R0_REGNUM];
|
|
pv_t *sp = &data.gpr[S390_SP_REGNUM - S390_R0_REGNUM];
|
|
int i;
|
|
CORE_ADDR cfa;
|
|
CORE_ADDR func;
|
|
CORE_ADDR result;
|
|
ULONGEST reg;
|
|
CORE_ADDR prev_sp;
|
|
int frame_pointer;
|
|
int size;
|
|
struct frame_info *next_frame;
|
|
|
|
/* Try to find the function start address. If we can't find it, we don't
|
|
bother searching for it -- with modern compilers this would be mostly
|
|
pointless anyway. Trust that we'll either have valid DWARF-2 CFI data
|
|
or else a valid backchain ... */
|
|
func = get_frame_func (this_frame);
|
|
if (!func)
|
|
return 0;
|
|
|
|
/* Try to analyze the prologue. */
|
|
result = s390_analyze_prologue (gdbarch, func,
|
|
get_frame_pc (this_frame), &data);
|
|
if (!result)
|
|
return 0;
|
|
|
|
/* If this was successful, we should have found the instruction that
|
|
sets the stack pointer register to the previous value of the stack
|
|
pointer minus the frame size. */
|
|
if (!pv_is_register (*sp, S390_SP_REGNUM))
|
|
return 0;
|
|
|
|
/* A frame size of zero at this point can mean either a real
|
|
frameless function, or else a failure to find the prologue.
|
|
Perform some sanity checks to verify we really have a
|
|
frameless function. */
|
|
if (sp->k == 0)
|
|
{
|
|
/* If the next frame is a NORMAL_FRAME, this frame *cannot* have frame
|
|
size zero. This is only possible if the next frame is a sentinel
|
|
frame, a dummy frame, or a signal trampoline frame. */
|
|
/* FIXME: cagney/2004-05-01: This sanity check shouldn't be
|
|
needed, instead the code should simpliy rely on its
|
|
analysis. */
|
|
next_frame = get_next_frame (this_frame);
|
|
while (next_frame && get_frame_type (next_frame) == INLINE_FRAME)
|
|
next_frame = get_next_frame (next_frame);
|
|
if (next_frame
|
|
&& get_frame_type (get_next_frame (this_frame)) == NORMAL_FRAME)
|
|
return 0;
|
|
|
|
/* If we really have a frameless function, %r14 must be valid
|
|
-- in particular, it must point to a different function. */
|
|
reg = get_frame_register_unsigned (this_frame, S390_RETADDR_REGNUM);
|
|
reg = gdbarch_addr_bits_remove (gdbarch, reg) - 1;
|
|
if (get_pc_function_start (reg) == func)
|
|
{
|
|
/* However, there is one case where it *is* valid for %r14
|
|
to point to the same function -- if this is a recursive
|
|
call, and we have stopped in the prologue *before* the
|
|
stack frame was allocated.
|
|
|
|
Recognize this case by looking ahead a bit ... */
|
|
|
|
struct s390_prologue_data data2;
|
|
pv_t *sp = &data2.gpr[S390_SP_REGNUM - S390_R0_REGNUM];
|
|
|
|
if (!(s390_analyze_prologue (gdbarch, func, (CORE_ADDR)-1, &data2)
|
|
&& pv_is_register (*sp, S390_SP_REGNUM)
|
|
&& sp->k != 0))
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
|
|
/* OK, we've found valid prologue data. */
|
|
size = -sp->k;
|
|
|
|
/* If the frame pointer originally also holds the same value
|
|
as the stack pointer, we're probably using it. If it holds
|
|
some other value -- even a constant offset -- it is most
|
|
likely used as temp register. */
|
|
if (pv_is_identical (*sp, *fp))
|
|
frame_pointer = S390_FRAME_REGNUM;
|
|
else
|
|
frame_pointer = S390_SP_REGNUM;
|
|
|
|
/* If we've detected a function with stack frame, we'll still have to
|
|
treat it as frameless if we're currently within the function epilog
|
|
code at a point where the frame pointer has already been restored.
|
|
This can only happen in an innermost frame. */
|
|
/* FIXME: cagney/2004-05-01: This sanity check shouldn't be needed,
|
|
instead the code should simpliy rely on its analysis. */
|
|
next_frame = get_next_frame (this_frame);
|
|
while (next_frame && get_frame_type (next_frame) == INLINE_FRAME)
|
|
next_frame = get_next_frame (next_frame);
|
|
if (size > 0
|
|
&& (next_frame == NULL
|
|
|| get_frame_type (get_next_frame (this_frame)) != NORMAL_FRAME))
|
|
{
|
|
/* See the comment in s390_stack_frame_destroyed_p on why this is
|
|
not completely reliable ... */
|
|
if (s390_stack_frame_destroyed_p (gdbarch, get_frame_pc (this_frame)))
|
|
{
|
|
memset (&data, 0, sizeof (data));
|
|
size = 0;
|
|
frame_pointer = S390_SP_REGNUM;
|
|
}
|
|
}
|
|
|
|
/* Once we know the frame register and the frame size, we can unwind
|
|
the current value of the frame register from the next frame, and
|
|
add back the frame size to arrive that the previous frame's
|
|
stack pointer value. */
|
|
prev_sp = get_frame_register_unsigned (this_frame, frame_pointer) + size;
|
|
cfa = prev_sp + 16*word_size + 32;
|
|
|
|
/* Set up ABI call-saved/call-clobbered registers. */
|
|
for (i = 0; i < S390_NUM_REGS; i++)
|
|
if (!s390_register_call_saved (gdbarch, i))
|
|
trad_frame_set_unknown (info->saved_regs, i);
|
|
|
|
/* CC is always call-clobbered. */
|
|
trad_frame_set_unknown (info->saved_regs, S390_PSWM_REGNUM);
|
|
|
|
/* Record the addresses of all register spill slots the prologue parser
|
|
has recognized. Consider only registers defined as call-saved by the
|
|
ABI; for call-clobbered registers the parser may have recognized
|
|
spurious stores. */
|
|
|
|
for (i = 0; i < 16; i++)
|
|
if (s390_register_call_saved (gdbarch, S390_R0_REGNUM + i)
|
|
&& data.gpr_slot[i] != 0)
|
|
info->saved_regs[S390_R0_REGNUM + i].addr = cfa - data.gpr_slot[i];
|
|
|
|
for (i = 0; i < 16; i++)
|
|
if (s390_register_call_saved (gdbarch, S390_F0_REGNUM + i)
|
|
&& data.fpr_slot[i] != 0)
|
|
info->saved_regs[S390_F0_REGNUM + i].addr = cfa - data.fpr_slot[i];
|
|
|
|
/* Function return will set PC to %r14. */
|
|
info->saved_regs[S390_PSWA_REGNUM] = info->saved_regs[S390_RETADDR_REGNUM];
|
|
|
|
/* In frameless functions, we unwind simply by moving the return
|
|
address to the PC. However, if we actually stored to the
|
|
save area, use that -- we might only think the function frameless
|
|
because we're in the middle of the prologue ... */
|
|
if (size == 0
|
|
&& !trad_frame_addr_p (info->saved_regs, S390_PSWA_REGNUM))
|
|
{
|
|
info->saved_regs[S390_PSWA_REGNUM].realreg = S390_RETADDR_REGNUM;
|
|
}
|
|
|
|
/* Another sanity check: unless this is a frameless function,
|
|
we should have found spill slots for SP and PC.
|
|
If not, we cannot unwind further -- this happens e.g. in
|
|
libc's thread_start routine. */
|
|
if (size > 0)
|
|
{
|
|
if (!trad_frame_addr_p (info->saved_regs, S390_SP_REGNUM)
|
|
|| !trad_frame_addr_p (info->saved_regs, S390_PSWA_REGNUM))
|
|
prev_sp = -1;
|
|
}
|
|
|
|
/* We use the current value of the frame register as local_base,
|
|
and the top of the register save area as frame_base. */
|
|
if (prev_sp != -1)
|
|
{
|
|
info->frame_base = prev_sp + 16*word_size + 32;
|
|
info->local_base = prev_sp - size;
|
|
}
|
|
|
|
info->func = func;
|
|
return 1;
|
|
}
|
|
|
|
static void
|
|
s390_backchain_frame_unwind_cache (struct frame_info *this_frame,
|
|
struct s390_unwind_cache *info)
|
|
{
|
|
struct gdbarch *gdbarch = get_frame_arch (this_frame);
|
|
int word_size = gdbarch_ptr_bit (gdbarch) / 8;
|
|
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
|
|
CORE_ADDR backchain;
|
|
ULONGEST reg;
|
|
LONGEST sp;
|
|
int i;
|
|
|
|
/* Set up ABI call-saved/call-clobbered registers. */
|
|
for (i = 0; i < S390_NUM_REGS; i++)
|
|
if (!s390_register_call_saved (gdbarch, i))
|
|
trad_frame_set_unknown (info->saved_regs, i);
|
|
|
|
/* CC is always call-clobbered. */
|
|
trad_frame_set_unknown (info->saved_regs, S390_PSWM_REGNUM);
|
|
|
|
/* Get the backchain. */
|
|
reg = get_frame_register_unsigned (this_frame, S390_SP_REGNUM);
|
|
backchain = read_memory_unsigned_integer (reg, word_size, byte_order);
|
|
|
|
/* A zero backchain terminates the frame chain. As additional
|
|
sanity check, let's verify that the spill slot for SP in the
|
|
save area pointed to by the backchain in fact links back to
|
|
the save area. */
|
|
if (backchain != 0
|
|
&& safe_read_memory_integer (backchain + 15*word_size,
|
|
word_size, byte_order, &sp)
|
|
&& (CORE_ADDR)sp == backchain)
|
|
{
|
|
/* We don't know which registers were saved, but it will have
|
|
to be at least %r14 and %r15. This will allow us to continue
|
|
unwinding, but other prev-frame registers may be incorrect ... */
|
|
info->saved_regs[S390_SP_REGNUM].addr = backchain + 15*word_size;
|
|
info->saved_regs[S390_RETADDR_REGNUM].addr = backchain + 14*word_size;
|
|
|
|
/* Function return will set PC to %r14. */
|
|
info->saved_regs[S390_PSWA_REGNUM]
|
|
= info->saved_regs[S390_RETADDR_REGNUM];
|
|
|
|
/* We use the current value of the frame register as local_base,
|
|
and the top of the register save area as frame_base. */
|
|
info->frame_base = backchain + 16*word_size + 32;
|
|
info->local_base = reg;
|
|
}
|
|
|
|
info->func = get_frame_pc (this_frame);
|
|
}
|
|
|
|
static struct s390_unwind_cache *
|
|
s390_frame_unwind_cache (struct frame_info *this_frame,
|
|
void **this_prologue_cache)
|
|
{
|
|
struct s390_unwind_cache *info;
|
|
|
|
if (*this_prologue_cache)
|
|
return *this_prologue_cache;
|
|
|
|
info = FRAME_OBSTACK_ZALLOC (struct s390_unwind_cache);
|
|
*this_prologue_cache = info;
|
|
info->saved_regs = trad_frame_alloc_saved_regs (this_frame);
|
|
info->func = -1;
|
|
info->frame_base = -1;
|
|
info->local_base = -1;
|
|
|
|
TRY
|
|
{
|
|
/* Try to use prologue analysis to fill the unwind cache.
|
|
If this fails, fall back to reading the stack backchain. */
|
|
if (!s390_prologue_frame_unwind_cache (this_frame, info))
|
|
s390_backchain_frame_unwind_cache (this_frame, info);
|
|
}
|
|
CATCH (ex, RETURN_MASK_ERROR)
|
|
{
|
|
if (ex.error != NOT_AVAILABLE_ERROR)
|
|
throw_exception (ex);
|
|
}
|
|
END_CATCH
|
|
|
|
return info;
|
|
}
|
|
|
|
static void
|
|
s390_frame_this_id (struct frame_info *this_frame,
|
|
void **this_prologue_cache,
|
|
struct frame_id *this_id)
|
|
{
|
|
struct s390_unwind_cache *info
|
|
= s390_frame_unwind_cache (this_frame, this_prologue_cache);
|
|
|
|
if (info->frame_base == -1)
|
|
return;
|
|
|
|
*this_id = frame_id_build (info->frame_base, info->func);
|
|
}
|
|
|
|
static struct value *
|
|
s390_frame_prev_register (struct frame_info *this_frame,
|
|
void **this_prologue_cache, int regnum)
|
|
{
|
|
struct gdbarch *gdbarch = get_frame_arch (this_frame);
|
|
struct s390_unwind_cache *info
|
|
= s390_frame_unwind_cache (this_frame, this_prologue_cache);
|
|
|
|
return s390_trad_frame_prev_register (this_frame, info->saved_regs, regnum);
|
|
}
|
|
|
|
static const struct frame_unwind s390_frame_unwind = {
|
|
NORMAL_FRAME,
|
|
default_frame_unwind_stop_reason,
|
|
s390_frame_this_id,
|
|
s390_frame_prev_register,
|
|
NULL,
|
|
default_frame_sniffer
|
|
};
|
|
|
|
|
|
/* Code stubs and their stack frames. For things like PLTs and NULL
|
|
function calls (where there is no true frame and the return address
|
|
is in the RETADDR register). */
|
|
|
|
struct s390_stub_unwind_cache
|
|
{
|
|
CORE_ADDR frame_base;
|
|
struct trad_frame_saved_reg *saved_regs;
|
|
};
|
|
|
|
static struct s390_stub_unwind_cache *
|
|
s390_stub_frame_unwind_cache (struct frame_info *this_frame,
|
|
void **this_prologue_cache)
|
|
{
|
|
struct gdbarch *gdbarch = get_frame_arch (this_frame);
|
|
int word_size = gdbarch_ptr_bit (gdbarch) / 8;
|
|
struct s390_stub_unwind_cache *info;
|
|
ULONGEST reg;
|
|
|
|
if (*this_prologue_cache)
|
|
return *this_prologue_cache;
|
|
|
|
info = FRAME_OBSTACK_ZALLOC (struct s390_stub_unwind_cache);
|
|
*this_prologue_cache = info;
|
|
info->saved_regs = trad_frame_alloc_saved_regs (this_frame);
|
|
|
|
/* The return address is in register %r14. */
|
|
info->saved_regs[S390_PSWA_REGNUM].realreg = S390_RETADDR_REGNUM;
|
|
|
|
/* Retrieve stack pointer and determine our frame base. */
|
|
reg = get_frame_register_unsigned (this_frame, S390_SP_REGNUM);
|
|
info->frame_base = reg + 16*word_size + 32;
|
|
|
|
return info;
|
|
}
|
|
|
|
static void
|
|
s390_stub_frame_this_id (struct frame_info *this_frame,
|
|
void **this_prologue_cache,
|
|
struct frame_id *this_id)
|
|
{
|
|
struct s390_stub_unwind_cache *info
|
|
= s390_stub_frame_unwind_cache (this_frame, this_prologue_cache);
|
|
*this_id = frame_id_build (info->frame_base, get_frame_pc (this_frame));
|
|
}
|
|
|
|
static struct value *
|
|
s390_stub_frame_prev_register (struct frame_info *this_frame,
|
|
void **this_prologue_cache, int regnum)
|
|
{
|
|
struct s390_stub_unwind_cache *info
|
|
= s390_stub_frame_unwind_cache (this_frame, this_prologue_cache);
|
|
return s390_trad_frame_prev_register (this_frame, info->saved_regs, regnum);
|
|
}
|
|
|
|
static int
|
|
s390_stub_frame_sniffer (const struct frame_unwind *self,
|
|
struct frame_info *this_frame,
|
|
void **this_prologue_cache)
|
|
{
|
|
CORE_ADDR addr_in_block;
|
|
bfd_byte insn[S390_MAX_INSTR_SIZE];
|
|
|
|
/* If the current PC points to non-readable memory, we assume we
|
|
have trapped due to an invalid function pointer call. We handle
|
|
the non-existing current function like a PLT stub. */
|
|
addr_in_block = get_frame_address_in_block (this_frame);
|
|
if (in_plt_section (addr_in_block)
|
|
|| s390_readinstruction (insn, get_frame_pc (this_frame)) < 0)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static const struct frame_unwind s390_stub_frame_unwind = {
|
|
NORMAL_FRAME,
|
|
default_frame_unwind_stop_reason,
|
|
s390_stub_frame_this_id,
|
|
s390_stub_frame_prev_register,
|
|
NULL,
|
|
s390_stub_frame_sniffer
|
|
};
|
|
|
|
|
|
/* Signal trampoline stack frames. */
|
|
|
|
struct s390_sigtramp_unwind_cache {
|
|
CORE_ADDR frame_base;
|
|
struct trad_frame_saved_reg *saved_regs;
|
|
};
|
|
|
|
static struct s390_sigtramp_unwind_cache *
|
|
s390_sigtramp_frame_unwind_cache (struct frame_info *this_frame,
|
|
void **this_prologue_cache)
|
|
{
|
|
struct gdbarch *gdbarch = get_frame_arch (this_frame);
|
|
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
|
int word_size = gdbarch_ptr_bit (gdbarch) / 8;
|
|
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
|
|
struct s390_sigtramp_unwind_cache *info;
|
|
ULONGEST this_sp, prev_sp;
|
|
CORE_ADDR next_ra, next_cfa, sigreg_ptr, sigreg_high_off;
|
|
int i;
|
|
|
|
if (*this_prologue_cache)
|
|
return *this_prologue_cache;
|
|
|
|
info = FRAME_OBSTACK_ZALLOC (struct s390_sigtramp_unwind_cache);
|
|
*this_prologue_cache = info;
|
|
info->saved_regs = trad_frame_alloc_saved_regs (this_frame);
|
|
|
|
this_sp = get_frame_register_unsigned (this_frame, S390_SP_REGNUM);
|
|
next_ra = get_frame_pc (this_frame);
|
|
next_cfa = this_sp + 16*word_size + 32;
|
|
|
|
/* New-style RT frame:
|
|
retcode + alignment (8 bytes)
|
|
siginfo (128 bytes)
|
|
ucontext (contains sigregs at offset 5 words). */
|
|
if (next_ra == next_cfa)
|
|
{
|
|
sigreg_ptr = next_cfa + 8 + 128 + align_up (5*word_size, 8);
|
|
/* sigregs are followed by uc_sigmask (8 bytes), then by the
|
|
upper GPR halves if present. */
|
|
sigreg_high_off = 8;
|
|
}
|
|
|
|
/* Old-style RT frame and all non-RT frames:
|
|
old signal mask (8 bytes)
|
|
pointer to sigregs. */
|
|
else
|
|
{
|
|
sigreg_ptr = read_memory_unsigned_integer (next_cfa + 8,
|
|
word_size, byte_order);
|
|
/* sigregs are followed by signo (4 bytes), then by the
|
|
upper GPR halves if present. */
|
|
sigreg_high_off = 4;
|
|
}
|
|
|
|
/* The sigregs structure looks like this:
|
|
long psw_mask;
|
|
long psw_addr;
|
|
long gprs[16];
|
|
int acrs[16];
|
|
int fpc;
|
|
int __pad;
|
|
double fprs[16]; */
|
|
|
|
/* PSW mask and address. */
|
|
info->saved_regs[S390_PSWM_REGNUM].addr = sigreg_ptr;
|
|
sigreg_ptr += word_size;
|
|
info->saved_regs[S390_PSWA_REGNUM].addr = sigreg_ptr;
|
|
sigreg_ptr += word_size;
|
|
|
|
/* Then the GPRs. */
|
|
for (i = 0; i < 16; i++)
|
|
{
|
|
info->saved_regs[S390_R0_REGNUM + i].addr = sigreg_ptr;
|
|
sigreg_ptr += word_size;
|
|
}
|
|
|
|
/* Then the ACRs. */
|
|
for (i = 0; i < 16; i++)
|
|
{
|
|
info->saved_regs[S390_A0_REGNUM + i].addr = sigreg_ptr;
|
|
sigreg_ptr += 4;
|
|
}
|
|
|
|
/* The floating-point control word. */
|
|
info->saved_regs[S390_FPC_REGNUM].addr = sigreg_ptr;
|
|
sigreg_ptr += 8;
|
|
|
|
/* And finally the FPRs. */
|
|
for (i = 0; i < 16; i++)
|
|
{
|
|
info->saved_regs[S390_F0_REGNUM + i].addr = sigreg_ptr;
|
|
sigreg_ptr += 8;
|
|
}
|
|
|
|
/* If we have them, the GPR upper halves are appended at the end. */
|
|
sigreg_ptr += sigreg_high_off;
|
|
if (tdep->gpr_full_regnum != -1)
|
|
for (i = 0; i < 16; i++)
|
|
{
|
|
info->saved_regs[S390_R0_UPPER_REGNUM + i].addr = sigreg_ptr;
|
|
sigreg_ptr += 4;
|
|
}
|
|
|
|
/* Restore the previous frame's SP. */
|
|
prev_sp = read_memory_unsigned_integer (
|
|
info->saved_regs[S390_SP_REGNUM].addr,
|
|
word_size, byte_order);
|
|
|
|
/* Determine our frame base. */
|
|
info->frame_base = prev_sp + 16*word_size + 32;
|
|
|
|
return info;
|
|
}
|
|
|
|
static void
|
|
s390_sigtramp_frame_this_id (struct frame_info *this_frame,
|
|
void **this_prologue_cache,
|
|
struct frame_id *this_id)
|
|
{
|
|
struct s390_sigtramp_unwind_cache *info
|
|
= s390_sigtramp_frame_unwind_cache (this_frame, this_prologue_cache);
|
|
*this_id = frame_id_build (info->frame_base, get_frame_pc (this_frame));
|
|
}
|
|
|
|
static struct value *
|
|
s390_sigtramp_frame_prev_register (struct frame_info *this_frame,
|
|
void **this_prologue_cache, int regnum)
|
|
{
|
|
struct s390_sigtramp_unwind_cache *info
|
|
= s390_sigtramp_frame_unwind_cache (this_frame, this_prologue_cache);
|
|
return s390_trad_frame_prev_register (this_frame, info->saved_regs, regnum);
|
|
}
|
|
|
|
static int
|
|
s390_sigtramp_frame_sniffer (const struct frame_unwind *self,
|
|
struct frame_info *this_frame,
|
|
void **this_prologue_cache)
|
|
{
|
|
CORE_ADDR pc = get_frame_pc (this_frame);
|
|
bfd_byte sigreturn[2];
|
|
|
|
if (target_read_memory (pc, sigreturn, 2))
|
|
return 0;
|
|
|
|
if (sigreturn[0] != op_svc)
|
|
return 0;
|
|
|
|
if (sigreturn[1] != 119 /* sigreturn */
|
|
&& sigreturn[1] != 173 /* rt_sigreturn */)
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static const struct frame_unwind s390_sigtramp_frame_unwind = {
|
|
SIGTRAMP_FRAME,
|
|
default_frame_unwind_stop_reason,
|
|
s390_sigtramp_frame_this_id,
|
|
s390_sigtramp_frame_prev_register,
|
|
NULL,
|
|
s390_sigtramp_frame_sniffer
|
|
};
|
|
|
|
/* Retrieve the syscall number at a ptrace syscall-stop. Return -1
|
|
upon error. */
|
|
|
|
static LONGEST
|
|
s390_linux_get_syscall_number (struct gdbarch *gdbarch,
|
|
ptid_t ptid)
|
|
{
|
|
struct regcache *regs = get_thread_regcache (ptid);
|
|
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
|
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
|
|
ULONGEST pc;
|
|
ULONGEST svc_number = -1;
|
|
unsigned opcode;
|
|
|
|
/* Assume that the PC points after the 2-byte SVC instruction. We
|
|
don't currently support SVC via EXECUTE. */
|
|
regcache_cooked_read_unsigned (regs, tdep->pc_regnum, &pc);
|
|
pc -= 2;
|
|
opcode = read_memory_unsigned_integer ((CORE_ADDR) pc, 1, byte_order);
|
|
if (opcode != op_svc)
|
|
return -1;
|
|
|
|
svc_number = read_memory_unsigned_integer ((CORE_ADDR) pc + 1, 1,
|
|
byte_order);
|
|
if (svc_number == 0)
|
|
regcache_cooked_read_unsigned (regs, S390_R1_REGNUM, &svc_number);
|
|
|
|
return svc_number;
|
|
}
|
|
|
|
|
|
/* Frame base handling. */
|
|
|
|
static CORE_ADDR
|
|
s390_frame_base_address (struct frame_info *this_frame, void **this_cache)
|
|
{
|
|
struct s390_unwind_cache *info
|
|
= s390_frame_unwind_cache (this_frame, this_cache);
|
|
return info->frame_base;
|
|
}
|
|
|
|
static CORE_ADDR
|
|
s390_local_base_address (struct frame_info *this_frame, void **this_cache)
|
|
{
|
|
struct s390_unwind_cache *info
|
|
= s390_frame_unwind_cache (this_frame, this_cache);
|
|
return info->local_base;
|
|
}
|
|
|
|
static const struct frame_base s390_frame_base = {
|
|
&s390_frame_unwind,
|
|
s390_frame_base_address,
|
|
s390_local_base_address,
|
|
s390_local_base_address
|
|
};
|
|
|
|
static CORE_ADDR
|
|
s390_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)
|
|
{
|
|
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
|
ULONGEST pc;
|
|
pc = frame_unwind_register_unsigned (next_frame, tdep->pc_regnum);
|
|
return gdbarch_addr_bits_remove (gdbarch, pc);
|
|
}
|
|
|
|
static CORE_ADDR
|
|
s390_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame)
|
|
{
|
|
ULONGEST sp;
|
|
sp = frame_unwind_register_unsigned (next_frame, S390_SP_REGNUM);
|
|
return gdbarch_addr_bits_remove (gdbarch, sp);
|
|
}
|
|
|
|
|
|
/* DWARF-2 frame support. */
|
|
|
|
static struct value *
|
|
s390_dwarf2_prev_register (struct frame_info *this_frame, void **this_cache,
|
|
int regnum)
|
|
{
|
|
return s390_unwind_pseudo_register (this_frame, regnum);
|
|
}
|
|
|
|
static void
|
|
s390_dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum,
|
|
struct dwarf2_frame_state_reg *reg,
|
|
struct frame_info *this_frame)
|
|
{
|
|
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
|
|
|
/* The condition code (and thus PSW mask) is call-clobbered. */
|
|
if (regnum == S390_PSWM_REGNUM)
|
|
reg->how = DWARF2_FRAME_REG_UNDEFINED;
|
|
|
|
/* The PSW address unwinds to the return address. */
|
|
else if (regnum == S390_PSWA_REGNUM)
|
|
reg->how = DWARF2_FRAME_REG_RA;
|
|
|
|
/* Fixed registers are call-saved or call-clobbered
|
|
depending on the ABI in use. */
|
|
else if (regnum < S390_NUM_REGS)
|
|
{
|
|
if (s390_register_call_saved (gdbarch, regnum))
|
|
reg->how = DWARF2_FRAME_REG_SAME_VALUE;
|
|
else
|
|
reg->how = DWARF2_FRAME_REG_UNDEFINED;
|
|
}
|
|
|
|
/* We install a special function to unwind pseudos. */
|
|
else
|
|
{
|
|
reg->how = DWARF2_FRAME_REG_FN;
|
|
reg->loc.fn = s390_dwarf2_prev_register;
|
|
}
|
|
}
|
|
|
|
|
|
/* Dummy function calls. */
|
|
|
|
/* Unwrap any single-field structs in TYPE and return the effective
|
|
"inner" type. E.g., yield "float" for all these cases:
|
|
|
|
float x;
|
|
struct { float x };
|
|
struct { struct { float x; } x; };
|
|
struct { struct { struct { float x; } x; } x; };
|
|
|
|
However, if an inner type is smaller than MIN_SIZE, abort the
|
|
unwrapping. */
|
|
|
|
static struct type *
|
|
s390_effective_inner_type (struct type *type, unsigned int min_size)
|
|
{
|
|
while (TYPE_CODE (type) == TYPE_CODE_STRUCT
|
|
&& TYPE_NFIELDS (type) == 1)
|
|
{
|
|
struct type *inner = check_typedef (TYPE_FIELD_TYPE (type, 0));
|
|
|
|
if (TYPE_LENGTH (inner) < min_size)
|
|
break;
|
|
type = inner;
|
|
}
|
|
|
|
return type;
|
|
}
|
|
|
|
/* Return non-zero if TYPE should be passed like "float" or
|
|
"double". */
|
|
|
|
static int
|
|
s390_function_arg_float (struct type *type)
|
|
{
|
|
/* Note that long double as well as complex types are intentionally
|
|
excluded. */
|
|
if (TYPE_LENGTH (type) > 8)
|
|
return 0;
|
|
|
|
/* A struct containing just a float or double is passed like a float
|
|
or double. */
|
|
type = s390_effective_inner_type (type, 0);
|
|
|
|
return (TYPE_CODE (type) == TYPE_CODE_FLT
|
|
|| TYPE_CODE (type) == TYPE_CODE_DECFLOAT);
|
|
}
|
|
|
|
/* Return non-zero if TYPE should be passed like a vector. */
|
|
|
|
static int
|
|
s390_function_arg_vector (struct type *type)
|
|
{
|
|
if (TYPE_LENGTH (type) > 16)
|
|
return 0;
|
|
|
|
/* Structs containing just a vector are passed like a vector. */
|
|
type = s390_effective_inner_type (type, TYPE_LENGTH (type));
|
|
|
|
return TYPE_CODE (type) == TYPE_CODE_ARRAY && TYPE_VECTOR (type);
|
|
}
|
|
|
|
/* Determine whether N is a power of two. */
|
|
|
|
static int
|
|
is_power_of_two (unsigned int n)
|
|
{
|
|
return n && ((n & (n - 1)) == 0);
|
|
}
|
|
|
|
/* For an argument whose type is TYPE and which is not passed like a
|
|
float or vector, return non-zero if it should be passed like "int"
|
|
or "long long". */
|
|
|
|
static int
|
|
s390_function_arg_integer (struct type *type)
|
|
{
|
|
enum type_code code = TYPE_CODE (type);
|
|
|
|
if (TYPE_LENGTH (type) > 8)
|
|
return 0;
|
|
|
|
if (code == TYPE_CODE_INT
|
|
|| code == TYPE_CODE_ENUM
|
|
|| code == TYPE_CODE_RANGE
|
|
|| code == TYPE_CODE_CHAR
|
|
|| code == TYPE_CODE_BOOL
|
|
|| code == TYPE_CODE_PTR
|
|
|| code == TYPE_CODE_REF)
|
|
return 1;
|
|
|
|
return ((code == TYPE_CODE_UNION || code == TYPE_CODE_STRUCT)
|
|
&& is_power_of_two (TYPE_LENGTH (type)));
|
|
}
|
|
|
|
/* Argument passing state: Internal data structure passed to helper
|
|
routines of s390_push_dummy_call. */
|
|
|
|
struct s390_arg_state
|
|
{
|
|
/* Register cache, or NULL, if we are in "preparation mode". */
|
|
struct regcache *regcache;
|
|
/* Next available general/floating-point/vector register for
|
|
argument passing. */
|
|
int gr, fr, vr;
|
|
/* Current pointer to copy area (grows downwards). */
|
|
CORE_ADDR copy;
|
|
/* Current pointer to parameter area (grows upwards). */
|
|
CORE_ADDR argp;
|
|
};
|
|
|
|
/* Prepare one argument ARG for a dummy call and update the argument
|
|
passing state AS accordingly. If the regcache field in AS is set,
|
|
operate in "write mode" and write ARG into the inferior. Otherwise
|
|
run "preparation mode" and skip all updates to the inferior. */
|
|
|
|
static void
|
|
s390_handle_arg (struct s390_arg_state *as, struct value *arg,
|
|
struct gdbarch_tdep *tdep, int word_size,
|
|
enum bfd_endian byte_order, int is_unnamed)
|
|
{
|
|
struct type *type = check_typedef (value_type (arg));
|
|
unsigned int length = TYPE_LENGTH (type);
|
|
int write_mode = as->regcache != NULL;
|
|
|
|
if (s390_function_arg_float (type))
|
|
{
|
|
/* The GNU/Linux for S/390 ABI uses FPRs 0 and 2 to pass
|
|
arguments. The GNU/Linux for zSeries ABI uses 0, 2, 4, and
|
|
6. */
|
|
if (as->fr <= (tdep->abi == ABI_LINUX_S390 ? 2 : 6))
|
|
{
|
|
/* When we store a single-precision value in an FP register,
|
|
it occupies the leftmost bits. */
|
|
if (write_mode)
|
|
regcache_cooked_write_part (as->regcache,
|
|
S390_F0_REGNUM + as->fr,
|
|
0, length,
|
|
value_contents (arg));
|
|
as->fr += 2;
|
|
}
|
|
else
|
|
{
|
|
/* When we store a single-precision value in a stack slot,
|
|
it occupies the rightmost bits. */
|
|
as->argp = align_up (as->argp + length, word_size);
|
|
if (write_mode)
|
|
write_memory (as->argp - length, value_contents (arg),
|
|
length);
|
|
}
|
|
}
|
|
else if (tdep->vector_abi == S390_VECTOR_ABI_128
|
|
&& s390_function_arg_vector (type))
|
|
{
|
|
static const char use_vr[] = {24, 26, 28, 30, 25, 27, 29, 31};
|
|
|
|
if (!is_unnamed && as->vr < ARRAY_SIZE (use_vr))
|
|
{
|
|
int regnum = S390_V24_REGNUM + use_vr[as->vr] - 24;
|
|
|
|
if (write_mode)
|
|
regcache_cooked_write_part (as->regcache, regnum,
|
|
0, length,
|
|
value_contents (arg));
|
|
as->vr++;
|
|
}
|
|
else
|
|
{
|
|
if (write_mode)
|
|
write_memory (as->argp, value_contents (arg), length);
|
|
as->argp = align_up (as->argp + length, word_size);
|
|
}
|
|
}
|
|
else if (s390_function_arg_integer (type) && length <= word_size)
|
|
{
|
|
ULONGEST val;
|
|
|
|
if (write_mode)
|
|
{
|
|
/* Place value in least significant bits of the register or
|
|
memory word and sign- or zero-extend to full word size.
|
|
This also applies to a struct or union. */
|
|
val = TYPE_UNSIGNED (type)
|
|
? extract_unsigned_integer (value_contents (arg),
|
|
length, byte_order)
|
|
: extract_signed_integer (value_contents (arg),
|
|
length, byte_order);
|
|
}
|
|
|
|
if (as->gr <= 6)
|
|
{
|
|
if (write_mode)
|
|
regcache_cooked_write_unsigned (as->regcache,
|
|
S390_R0_REGNUM + as->gr,
|
|
val);
|
|
as->gr++;
|
|
}
|
|
else
|
|
{
|
|
if (write_mode)
|
|
write_memory_unsigned_integer (as->argp, word_size,
|
|
byte_order, val);
|
|
as->argp += word_size;
|
|
}
|
|
}
|
|
else if (s390_function_arg_integer (type) && length == 8)
|
|
{
|
|
if (as->gr <= 5)
|
|
{
|
|
if (write_mode)
|
|
{
|
|
regcache_cooked_write (as->regcache,
|
|
S390_R0_REGNUM + as->gr,
|
|
value_contents (arg));
|
|
regcache_cooked_write (as->regcache,
|
|
S390_R0_REGNUM + as->gr + 1,
|
|
value_contents (arg) + word_size);
|
|
}
|
|
as->gr += 2;
|
|
}
|
|
else
|
|
{
|
|
/* If we skipped r6 because we couldn't fit a DOUBLE_ARG
|
|
in it, then don't go back and use it again later. */
|
|
as->gr = 7;
|
|
|
|
if (write_mode)
|
|
write_memory (as->argp, value_contents (arg), length);
|
|
as->argp += length;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* This argument type is never passed in registers. Place the
|
|
value in the copy area and pass a pointer to it. Use 8-byte
|
|
alignment as a conservative assumption. */
|
|
as->copy = align_down (as->copy - length, 8);
|
|
if (write_mode)
|
|
write_memory (as->copy, value_contents (arg), length);
|
|
|
|
if (as->gr <= 6)
|
|
{
|
|
if (write_mode)
|
|
regcache_cooked_write_unsigned (as->regcache,
|
|
S390_R0_REGNUM + as->gr,
|
|
as->copy);
|
|
as->gr++;
|
|
}
|
|
else
|
|
{
|
|
if (write_mode)
|
|
write_memory_unsigned_integer (as->argp, word_size,
|
|
byte_order, as->copy);
|
|
as->argp += word_size;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Put the actual parameter values pointed to by ARGS[0..NARGS-1] in
|
|
place to be passed to a function, as specified by the "GNU/Linux
|
|
for S/390 ELF Application Binary Interface Supplement".
|
|
|
|
SP is the current stack pointer. We must put arguments, links,
|
|
padding, etc. whereever they belong, and return the new stack
|
|
pointer value.
|
|
|
|
If STRUCT_RETURN is non-zero, then the function we're calling is
|
|
going to return a structure by value; STRUCT_ADDR is the address of
|
|
a block we've allocated for it on the stack.
|
|
|
|
Our caller has taken care of any type promotions needed to satisfy
|
|
prototypes or the old K&R argument-passing rules. */
|
|
|
|
static CORE_ADDR
|
|
s390_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
|
|
struct regcache *regcache, CORE_ADDR bp_addr,
|
|
int nargs, struct value **args, CORE_ADDR sp,
|
|
int struct_return, CORE_ADDR struct_addr)
|
|
{
|
|
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
|
int word_size = gdbarch_ptr_bit (gdbarch) / 8;
|
|
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
|
|
int i;
|
|
struct s390_arg_state arg_state, arg_prep;
|
|
CORE_ADDR param_area_start, new_sp;
|
|
struct type *ftype = check_typedef (value_type (function));
|
|
|
|
if (TYPE_CODE (ftype) == TYPE_CODE_PTR)
|
|
ftype = check_typedef (TYPE_TARGET_TYPE (ftype));
|
|
|
|
arg_prep.copy = sp;
|
|
arg_prep.gr = struct_return ? 3 : 2;
|
|
arg_prep.fr = 0;
|
|
arg_prep.vr = 0;
|
|
arg_prep.argp = 0;
|
|
arg_prep.regcache = NULL;
|
|
|
|
/* Initialize arg_state for "preparation mode". */
|
|
arg_state = arg_prep;
|
|
|
|
/* Update arg_state.copy with the start of the reference-to-copy area
|
|
and arg_state.argp with the size of the parameter area. */
|
|
for (i = 0; i < nargs; i++)
|
|
s390_handle_arg (&arg_state, args[i], tdep, word_size, byte_order,
|
|
TYPE_VARARGS (ftype) && i >= TYPE_NFIELDS (ftype));
|
|
|
|
param_area_start = align_down (arg_state.copy - arg_state.argp, 8);
|
|
|
|
/* Allocate the standard frame areas: the register save area, the
|
|
word reserved for the compiler, and the back chain pointer. */
|
|
new_sp = param_area_start - (16 * word_size + 32);
|
|
|
|
/* Now we have the final stack pointer. Make sure we didn't
|
|
underflow; on 31-bit, this would result in addresses with the
|
|
high bit set, which causes confusion elsewhere. Note that if we
|
|
error out here, stack and registers remain untouched. */
|
|
if (gdbarch_addr_bits_remove (gdbarch, new_sp) != new_sp)
|
|
error (_("Stack overflow"));
|
|
|
|
/* Pass the structure return address in general register 2. */
|
|
if (struct_return)
|
|
regcache_cooked_write_unsigned (regcache, S390_R2_REGNUM, struct_addr);
|
|
|
|
/* Initialize arg_state for "write mode". */
|
|
arg_state = arg_prep;
|
|
arg_state.argp = param_area_start;
|
|
arg_state.regcache = regcache;
|
|
|
|
/* Write all parameters. */
|
|
for (i = 0; i < nargs; i++)
|
|
s390_handle_arg (&arg_state, args[i], tdep, word_size, byte_order,
|
|
TYPE_VARARGS (ftype) && i >= TYPE_NFIELDS (ftype));
|
|
|
|
/* Store return PSWA. In 31-bit mode, keep addressing mode bit. */
|
|
if (word_size == 4)
|
|
{
|
|
ULONGEST pswa;
|
|
regcache_cooked_read_unsigned (regcache, S390_PSWA_REGNUM, &pswa);
|
|
bp_addr = (bp_addr & 0x7fffffff) | (pswa & 0x80000000);
|
|
}
|
|
regcache_cooked_write_unsigned (regcache, S390_RETADDR_REGNUM, bp_addr);
|
|
|
|
/* Store updated stack pointer. */
|
|
regcache_cooked_write_unsigned (regcache, S390_SP_REGNUM, new_sp);
|
|
|
|
/* We need to return the 'stack part' of the frame ID,
|
|
which is actually the top of the register save area. */
|
|
return param_area_start;
|
|
}
|
|
|
|
/* Assuming THIS_FRAME is a dummy, return the frame ID of that
|
|
dummy frame. The frame ID's base needs to match the TOS value
|
|
returned by push_dummy_call, and the PC match the dummy frame's
|
|
breakpoint. */
|
|
static struct frame_id
|
|
s390_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame)
|
|
{
|
|
int word_size = gdbarch_ptr_bit (gdbarch) / 8;
|
|
CORE_ADDR sp = get_frame_register_unsigned (this_frame, S390_SP_REGNUM);
|
|
sp = gdbarch_addr_bits_remove (gdbarch, sp);
|
|
|
|
return frame_id_build (sp + 16*word_size + 32,
|
|
get_frame_pc (this_frame));
|
|
}
|
|
|
|
static CORE_ADDR
|
|
s390_frame_align (struct gdbarch *gdbarch, CORE_ADDR addr)
|
|
{
|
|
/* Both the 32- and 64-bit ABI's say that the stack pointer should
|
|
always be aligned on an eight-byte boundary. */
|
|
return (addr & -8);
|
|
}
|
|
|
|
|
|
/* Helper for s390_return_value: Set or retrieve a function return
|
|
value if it resides in a register. */
|
|
|
|
static void
|
|
s390_register_return_value (struct gdbarch *gdbarch, struct type *type,
|
|
struct regcache *regcache,
|
|
gdb_byte *out, const gdb_byte *in)
|
|
{
|
|
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
|
|
int word_size = gdbarch_ptr_bit (gdbarch) / 8;
|
|
int length = TYPE_LENGTH (type);
|
|
int code = TYPE_CODE (type);
|
|
|
|
if (code == TYPE_CODE_FLT || code == TYPE_CODE_DECFLOAT)
|
|
{
|
|
/* Float-like value: left-aligned in f0. */
|
|
if (in != NULL)
|
|
regcache_cooked_write_part (regcache, S390_F0_REGNUM,
|
|
0, length, in);
|
|
else
|
|
regcache_cooked_read_part (regcache, S390_F0_REGNUM,
|
|
0, length, out);
|
|
}
|
|
else if (code == TYPE_CODE_ARRAY)
|
|
{
|
|
/* Vector: left-aligned in v24. */
|
|
if (in != NULL)
|
|
regcache_cooked_write_part (regcache, S390_V24_REGNUM,
|
|
0, length, in);
|
|
else
|
|
regcache_cooked_read_part (regcache, S390_V24_REGNUM,
|
|
0, length, out);
|
|
}
|
|
else if (length <= word_size)
|
|
{
|
|
/* Integer: zero- or sign-extended in r2. */
|
|
if (out != NULL)
|
|
regcache_cooked_read_part (regcache, S390_R2_REGNUM,
|
|
word_size - length, length, out);
|
|
else if (TYPE_UNSIGNED (type))
|
|
regcache_cooked_write_unsigned
|
|
(regcache, S390_R2_REGNUM,
|
|
extract_unsigned_integer (in, length, byte_order));
|
|
else
|
|
regcache_cooked_write_signed
|
|
(regcache, S390_R2_REGNUM,
|
|
extract_signed_integer (in, length, byte_order));
|
|
}
|
|
else if (length == 2 * word_size)
|
|
{
|
|
/* Double word: in r2 and r3. */
|
|
if (in != NULL)
|
|
{
|
|
regcache_cooked_write (regcache, S390_R2_REGNUM, in);
|
|
regcache_cooked_write (regcache, S390_R3_REGNUM,
|
|
in + word_size);
|
|
}
|
|
else
|
|
{
|
|
regcache_cooked_read (regcache, S390_R2_REGNUM, out);
|
|
regcache_cooked_read (regcache, S390_R3_REGNUM,
|
|
out + word_size);
|
|
}
|
|
}
|
|
else
|
|
internal_error (__FILE__, __LINE__, _("invalid return type"));
|
|
}
|
|
|
|
|
|
/* Implement the 'return_value' gdbarch method. */
|
|
|
|
static enum return_value_convention
|
|
s390_return_value (struct gdbarch *gdbarch, struct value *function,
|
|
struct type *type, struct regcache *regcache,
|
|
gdb_byte *out, const gdb_byte *in)
|
|
{
|
|
enum return_value_convention rvc;
|
|
|
|
type = check_typedef (type);
|
|
|
|
switch (TYPE_CODE (type))
|
|
{
|
|
case TYPE_CODE_STRUCT:
|
|
case TYPE_CODE_UNION:
|
|
case TYPE_CODE_COMPLEX:
|
|
rvc = RETURN_VALUE_STRUCT_CONVENTION;
|
|
break;
|
|
case TYPE_CODE_ARRAY:
|
|
rvc = (gdbarch_tdep (gdbarch)->vector_abi == S390_VECTOR_ABI_128
|
|
&& TYPE_LENGTH (type) <= 16 && TYPE_VECTOR (type))
|
|
? RETURN_VALUE_REGISTER_CONVENTION
|
|
: RETURN_VALUE_STRUCT_CONVENTION;
|
|
break;
|
|
default:
|
|
rvc = TYPE_LENGTH (type) <= 8
|
|
? RETURN_VALUE_REGISTER_CONVENTION
|
|
: RETURN_VALUE_STRUCT_CONVENTION;
|
|
}
|
|
|
|
if (in != NULL || out != NULL)
|
|
{
|
|
if (rvc == RETURN_VALUE_REGISTER_CONVENTION)
|
|
s390_register_return_value (gdbarch, type, regcache, out, in);
|
|
else if (in != NULL)
|
|
error (_("Cannot set function return value."));
|
|
else
|
|
error (_("Function return value unknown."));
|
|
}
|
|
|
|
return rvc;
|
|
}
|
|
|
|
|
|
/* Breakpoints. */
|
|
|
|
static const gdb_byte *
|
|
s390_breakpoint_from_pc (struct gdbarch *gdbarch,
|
|
CORE_ADDR *pcptr, int *lenptr)
|
|
{
|
|
static const gdb_byte breakpoint[] = { 0x0, 0x1 };
|
|
|
|
*lenptr = sizeof (breakpoint);
|
|
return breakpoint;
|
|
}
|
|
|
|
|
|
/* Address handling. */
|
|
|
|
static CORE_ADDR
|
|
s390_addr_bits_remove (struct gdbarch *gdbarch, CORE_ADDR addr)
|
|
{
|
|
return addr & 0x7fffffff;
|
|
}
|
|
|
|
static int
|
|
s390_address_class_type_flags (int byte_size, int dwarf2_addr_class)
|
|
{
|
|
if (byte_size == 4)
|
|
return TYPE_INSTANCE_FLAG_ADDRESS_CLASS_1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
static const char *
|
|
s390_address_class_type_flags_to_name (struct gdbarch *gdbarch, int type_flags)
|
|
{
|
|
if (type_flags & TYPE_INSTANCE_FLAG_ADDRESS_CLASS_1)
|
|
return "mode32";
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
static int
|
|
s390_address_class_name_to_type_flags (struct gdbarch *gdbarch,
|
|
const char *name,
|
|
int *type_flags_ptr)
|
|
{
|
|
if (strcmp (name, "mode32") == 0)
|
|
{
|
|
*type_flags_ptr = TYPE_INSTANCE_FLAG_ADDRESS_CLASS_1;
|
|
return 1;
|
|
}
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
/* Implement gdbarch_gcc_target_options. GCC does not know "-m32" or
|
|
"-mcmodel=large". */
|
|
|
|
static char *
|
|
s390_gcc_target_options (struct gdbarch *gdbarch)
|
|
{
|
|
return xstrdup (gdbarch_ptr_bit (gdbarch) == 64 ? "-m64" : "-m31");
|
|
}
|
|
|
|
/* Implement gdbarch_gnu_triplet_regexp. Target triplets are "s390-*"
|
|
for 31-bit and "s390x-*" for 64-bit, while the BFD arch name is
|
|
always "s390". Note that an s390x compiler supports "-m31" as
|
|
well. */
|
|
|
|
static const char *
|
|
s390_gnu_triplet_regexp (struct gdbarch *gdbarch)
|
|
{
|
|
return "s390x?";
|
|
}
|
|
|
|
/* Implementation of `gdbarch_stap_is_single_operand', as defined in
|
|
gdbarch.h. */
|
|
|
|
static int
|
|
s390_stap_is_single_operand (struct gdbarch *gdbarch, const char *s)
|
|
{
|
|
return ((isdigit (*s) && s[1] == '(' && s[2] == '%') /* Displacement
|
|
or indirection. */
|
|
|| *s == '%' /* Register access. */
|
|
|| isdigit (*s)); /* Literal number. */
|
|
}
|
|
|
|
/* Set up gdbarch struct. */
|
|
|
|
static struct gdbarch *
|
|
s390_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
|
|
{
|
|
const struct target_desc *tdesc = info.target_desc;
|
|
struct tdesc_arch_data *tdesc_data = NULL;
|
|
struct gdbarch *gdbarch;
|
|
struct gdbarch_tdep *tdep;
|
|
int tdep_abi;
|
|
enum s390_vector_abi_kind vector_abi;
|
|
int have_upper = 0;
|
|
int have_linux_v1 = 0;
|
|
int have_linux_v2 = 0;
|
|
int have_tdb = 0;
|
|
int have_vx = 0;
|
|
int first_pseudo_reg, last_pseudo_reg;
|
|
static const char *const stap_register_prefixes[] = { "%", NULL };
|
|
static const char *const stap_register_indirection_prefixes[] = { "(",
|
|
NULL };
|
|
static const char *const stap_register_indirection_suffixes[] = { ")",
|
|
NULL };
|
|
|
|
/* Default ABI and register size. */
|
|
switch (info.bfd_arch_info->mach)
|
|
{
|
|
case bfd_mach_s390_31:
|
|
tdep_abi = ABI_LINUX_S390;
|
|
break;
|
|
|
|
case bfd_mach_s390_64:
|
|
tdep_abi = ABI_LINUX_ZSERIES;
|
|
break;
|
|
|
|
default:
|
|
return NULL;
|
|
}
|
|
|
|
/* Use default target description if none provided by the target. */
|
|
if (!tdesc_has_registers (tdesc))
|
|
{
|
|
if (tdep_abi == ABI_LINUX_S390)
|
|
tdesc = tdesc_s390_linux32;
|
|
else
|
|
tdesc = tdesc_s390x_linux64;
|
|
}
|
|
|
|
/* Check any target description for validity. */
|
|
if (tdesc_has_registers (tdesc))
|
|
{
|
|
static const char *const gprs[] = {
|
|
"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
|
|
"r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"
|
|
};
|
|
static const char *const fprs[] = {
|
|
"f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
|
|
"f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15"
|
|
};
|
|
static const char *const acrs[] = {
|
|
"acr0", "acr1", "acr2", "acr3", "acr4", "acr5", "acr6", "acr7",
|
|
"acr8", "acr9", "acr10", "acr11", "acr12", "acr13", "acr14", "acr15"
|
|
};
|
|
static const char *const gprs_lower[] = {
|
|
"r0l", "r1l", "r2l", "r3l", "r4l", "r5l", "r6l", "r7l",
|
|
"r8l", "r9l", "r10l", "r11l", "r12l", "r13l", "r14l", "r15l"
|
|
};
|
|
static const char *const gprs_upper[] = {
|
|
"r0h", "r1h", "r2h", "r3h", "r4h", "r5h", "r6h", "r7h",
|
|
"r8h", "r9h", "r10h", "r11h", "r12h", "r13h", "r14h", "r15h"
|
|
};
|
|
static const char *const tdb_regs[] = {
|
|
"tdb0", "tac", "tct", "atia",
|
|
"tr0", "tr1", "tr2", "tr3", "tr4", "tr5", "tr6", "tr7",
|
|
"tr8", "tr9", "tr10", "tr11", "tr12", "tr13", "tr14", "tr15"
|
|
};
|
|
static const char *const vxrs_low[] = {
|
|
"v0l", "v1l", "v2l", "v3l", "v4l", "v5l", "v6l", "v7l", "v8l",
|
|
"v9l", "v10l", "v11l", "v12l", "v13l", "v14l", "v15l",
|
|
};
|
|
static const char *const vxrs_high[] = {
|
|
"v16", "v17", "v18", "v19", "v20", "v21", "v22", "v23", "v24",
|
|
"v25", "v26", "v27", "v28", "v29", "v30", "v31",
|
|
};
|
|
const struct tdesc_feature *feature;
|
|
int i, valid_p = 1;
|
|
|
|
feature = tdesc_find_feature (tdesc, "org.gnu.gdb.s390.core");
|
|
if (feature == NULL)
|
|
return NULL;
|
|
|
|
tdesc_data = tdesc_data_alloc ();
|
|
|
|
valid_p &= tdesc_numbered_register (feature, tdesc_data,
|
|
S390_PSWM_REGNUM, "pswm");
|
|
valid_p &= tdesc_numbered_register (feature, tdesc_data,
|
|
S390_PSWA_REGNUM, "pswa");
|
|
|
|
if (tdesc_unnumbered_register (feature, "r0"))
|
|
{
|
|
for (i = 0; i < 16; i++)
|
|
valid_p &= tdesc_numbered_register (feature, tdesc_data,
|
|
S390_R0_REGNUM + i, gprs[i]);
|
|
}
|
|
else
|
|
{
|
|
have_upper = 1;
|
|
|
|
for (i = 0; i < 16; i++)
|
|
valid_p &= tdesc_numbered_register (feature, tdesc_data,
|
|
S390_R0_REGNUM + i,
|
|
gprs_lower[i]);
|
|
for (i = 0; i < 16; i++)
|
|
valid_p &= tdesc_numbered_register (feature, tdesc_data,
|
|
S390_R0_UPPER_REGNUM + i,
|
|
gprs_upper[i]);
|
|
}
|
|
|
|
feature = tdesc_find_feature (tdesc, "org.gnu.gdb.s390.fpr");
|
|
if (feature == NULL)
|
|
{
|
|
tdesc_data_cleanup (tdesc_data);
|
|
return NULL;
|
|
}
|
|
|
|
valid_p &= tdesc_numbered_register (feature, tdesc_data,
|
|
S390_FPC_REGNUM, "fpc");
|
|
for (i = 0; i < 16; i++)
|
|
valid_p &= tdesc_numbered_register (feature, tdesc_data,
|
|
S390_F0_REGNUM + i, fprs[i]);
|
|
|
|
feature = tdesc_find_feature (tdesc, "org.gnu.gdb.s390.acr");
|
|
if (feature == NULL)
|
|
{
|
|
tdesc_data_cleanup (tdesc_data);
|
|
return NULL;
|
|
}
|
|
|
|
for (i = 0; i < 16; i++)
|
|
valid_p &= tdesc_numbered_register (feature, tdesc_data,
|
|
S390_A0_REGNUM + i, acrs[i]);
|
|
|
|
/* Optional GNU/Linux-specific "registers". */
|
|
feature = tdesc_find_feature (tdesc, "org.gnu.gdb.s390.linux");
|
|
if (feature)
|
|
{
|
|
tdesc_numbered_register (feature, tdesc_data,
|
|
S390_ORIG_R2_REGNUM, "orig_r2");
|
|
|
|
if (tdesc_numbered_register (feature, tdesc_data,
|
|
S390_LAST_BREAK_REGNUM, "last_break"))
|
|
have_linux_v1 = 1;
|
|
|
|
if (tdesc_numbered_register (feature, tdesc_data,
|
|
S390_SYSTEM_CALL_REGNUM, "system_call"))
|
|
have_linux_v2 = 1;
|
|
|
|
if (have_linux_v2 > have_linux_v1)
|
|
valid_p = 0;
|
|
}
|
|
|
|
/* Transaction diagnostic block. */
|
|
feature = tdesc_find_feature (tdesc, "org.gnu.gdb.s390.tdb");
|
|
if (feature)
|
|
{
|
|
for (i = 0; i < ARRAY_SIZE (tdb_regs); i++)
|
|
valid_p &= tdesc_numbered_register (feature, tdesc_data,
|
|
S390_TDB_DWORD0_REGNUM + i,
|
|
tdb_regs[i]);
|
|
have_tdb = 1;
|
|
}
|
|
|
|
/* Vector registers. */
|
|
feature = tdesc_find_feature (tdesc, "org.gnu.gdb.s390.vx");
|
|
if (feature)
|
|
{
|
|
for (i = 0; i < 16; i++)
|
|
valid_p &= tdesc_numbered_register (feature, tdesc_data,
|
|
S390_V0_LOWER_REGNUM + i,
|
|
vxrs_low[i]);
|
|
for (i = 0; i < 16; i++)
|
|
valid_p &= tdesc_numbered_register (feature, tdesc_data,
|
|
S390_V16_REGNUM + i,
|
|
vxrs_high[i]);
|
|
have_vx = 1;
|
|
}
|
|
|
|
if (!valid_p)
|
|
{
|
|
tdesc_data_cleanup (tdesc_data);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/* Determine vector ABI. */
|
|
vector_abi = S390_VECTOR_ABI_NONE;
|
|
#ifdef HAVE_ELF
|
|
if (have_vx
|
|
&& info.abfd != NULL
|
|
&& info.abfd->format == bfd_object
|
|
&& bfd_get_flavour (info.abfd) == bfd_target_elf_flavour
|
|
&& bfd_elf_get_obj_attr_int (info.abfd, OBJ_ATTR_GNU,
|
|
Tag_GNU_S390_ABI_Vector) == 2)
|
|
vector_abi = S390_VECTOR_ABI_128;
|
|
#endif
|
|
|
|
/* Find a candidate among extant architectures. */
|
|
for (arches = gdbarch_list_lookup_by_info (arches, &info);
|
|
arches != NULL;
|
|
arches = gdbarch_list_lookup_by_info (arches->next, &info))
|
|
{
|
|
tdep = gdbarch_tdep (arches->gdbarch);
|
|
if (!tdep)
|
|
continue;
|
|
if (tdep->abi != tdep_abi)
|
|
continue;
|
|
if (tdep->vector_abi != vector_abi)
|
|
continue;
|
|
if ((tdep->gpr_full_regnum != -1) != have_upper)
|
|
continue;
|
|
if (tdesc_data != NULL)
|
|
tdesc_data_cleanup (tdesc_data);
|
|
return arches->gdbarch;
|
|
}
|
|
|
|
/* Otherwise create a new gdbarch for the specified machine type. */
|
|
tdep = XCNEW (struct gdbarch_tdep);
|
|
tdep->abi = tdep_abi;
|
|
tdep->vector_abi = vector_abi;
|
|
tdep->have_linux_v1 = have_linux_v1;
|
|
tdep->have_linux_v2 = have_linux_v2;
|
|
tdep->have_tdb = have_tdb;
|
|
gdbarch = gdbarch_alloc (&info, tdep);
|
|
|
|
set_gdbarch_believe_pcc_promotion (gdbarch, 0);
|
|
set_gdbarch_char_signed (gdbarch, 0);
|
|
|
|
/* S/390 GNU/Linux uses either 64-bit or 128-bit long doubles.
|
|
We can safely let them default to 128-bit, since the debug info
|
|
will give the size of type actually used in each case. */
|
|
set_gdbarch_long_double_bit (gdbarch, 128);
|
|
set_gdbarch_long_double_format (gdbarch, floatformats_ia64_quad);
|
|
|
|
/* Amount PC must be decremented by after a breakpoint. This is
|
|
often the number of bytes returned by gdbarch_breakpoint_from_pc but not
|
|
always. */
|
|
set_gdbarch_decr_pc_after_break (gdbarch, 2);
|
|
/* Stack grows downward. */
|
|
set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
|
|
set_gdbarch_breakpoint_from_pc (gdbarch, s390_breakpoint_from_pc);
|
|
set_gdbarch_skip_prologue (gdbarch, s390_skip_prologue);
|
|
set_gdbarch_stack_frame_destroyed_p (gdbarch, s390_stack_frame_destroyed_p);
|
|
|
|
set_gdbarch_num_regs (gdbarch, S390_NUM_REGS);
|
|
set_gdbarch_sp_regnum (gdbarch, S390_SP_REGNUM);
|
|
set_gdbarch_fp0_regnum (gdbarch, S390_F0_REGNUM);
|
|
set_gdbarch_stab_reg_to_regnum (gdbarch, s390_dwarf_reg_to_regnum);
|
|
set_gdbarch_dwarf2_reg_to_regnum (gdbarch, s390_dwarf_reg_to_regnum);
|
|
set_gdbarch_value_from_register (gdbarch, s390_value_from_register);
|
|
set_gdbarch_core_read_description (gdbarch, s390_core_read_description);
|
|
set_gdbarch_iterate_over_regset_sections (gdbarch,
|
|
s390_iterate_over_regset_sections);
|
|
set_gdbarch_cannot_store_register (gdbarch, s390_cannot_store_register);
|
|
set_gdbarch_write_pc (gdbarch, s390_write_pc);
|
|
set_gdbarch_pseudo_register_read (gdbarch, s390_pseudo_register_read);
|
|
set_gdbarch_pseudo_register_write (gdbarch, s390_pseudo_register_write);
|
|
set_tdesc_pseudo_register_name (gdbarch, s390_pseudo_register_name);
|
|
set_tdesc_pseudo_register_type (gdbarch, s390_pseudo_register_type);
|
|
set_tdesc_pseudo_register_reggroup_p (gdbarch,
|
|
s390_pseudo_register_reggroup_p);
|
|
tdesc_use_registers (gdbarch, tdesc, tdesc_data);
|
|
set_gdbarch_register_name (gdbarch, s390_register_name);
|
|
|
|
/* Assign pseudo register numbers. */
|
|
first_pseudo_reg = gdbarch_num_regs (gdbarch);
|
|
last_pseudo_reg = first_pseudo_reg;
|
|
tdep->gpr_full_regnum = -1;
|
|
if (have_upper)
|
|
{
|
|
tdep->gpr_full_regnum = last_pseudo_reg;
|
|
last_pseudo_reg += 16;
|
|
}
|
|
tdep->v0_full_regnum = -1;
|
|
if (have_vx)
|
|
{
|
|
tdep->v0_full_regnum = last_pseudo_reg;
|
|
last_pseudo_reg += 16;
|
|
}
|
|
tdep->pc_regnum = last_pseudo_reg++;
|
|
tdep->cc_regnum = last_pseudo_reg++;
|
|
set_gdbarch_pc_regnum (gdbarch, tdep->pc_regnum);
|
|
set_gdbarch_num_pseudo_regs (gdbarch, last_pseudo_reg - first_pseudo_reg);
|
|
|
|
/* Inferior function calls. */
|
|
set_gdbarch_push_dummy_call (gdbarch, s390_push_dummy_call);
|
|
set_gdbarch_dummy_id (gdbarch, s390_dummy_id);
|
|
set_gdbarch_frame_align (gdbarch, s390_frame_align);
|
|
set_gdbarch_return_value (gdbarch, s390_return_value);
|
|
|
|
/* Syscall handling. */
|
|
set_gdbarch_get_syscall_number (gdbarch, s390_linux_get_syscall_number);
|
|
|
|
/* Frame handling. */
|
|
dwarf2_frame_set_init_reg (gdbarch, s390_dwarf2_frame_init_reg);
|
|
dwarf2_frame_set_adjust_regnum (gdbarch, s390_adjust_frame_regnum);
|
|
dwarf2_append_unwinders (gdbarch);
|
|
frame_base_append_sniffer (gdbarch, dwarf2_frame_base_sniffer);
|
|
frame_unwind_append_unwinder (gdbarch, &s390_stub_frame_unwind);
|
|
frame_unwind_append_unwinder (gdbarch, &s390_sigtramp_frame_unwind);
|
|
frame_unwind_append_unwinder (gdbarch, &s390_frame_unwind);
|
|
frame_base_set_default (gdbarch, &s390_frame_base);
|
|
set_gdbarch_unwind_pc (gdbarch, s390_unwind_pc);
|
|
set_gdbarch_unwind_sp (gdbarch, s390_unwind_sp);
|
|
|
|
/* Displaced stepping. */
|
|
set_gdbarch_displaced_step_copy_insn (gdbarch,
|
|
simple_displaced_step_copy_insn);
|
|
set_gdbarch_displaced_step_fixup (gdbarch, s390_displaced_step_fixup);
|
|
set_gdbarch_displaced_step_free_closure (gdbarch,
|
|
simple_displaced_step_free_closure);
|
|
set_gdbarch_displaced_step_location (gdbarch, linux_displaced_step_location);
|
|
set_gdbarch_max_insn_length (gdbarch, S390_MAX_INSTR_SIZE);
|
|
|
|
/* Note that GNU/Linux is the only OS supported on this
|
|
platform. */
|
|
linux_init_abi (info, gdbarch);
|
|
|
|
switch (tdep->abi)
|
|
{
|
|
case ABI_LINUX_S390:
|
|
set_gdbarch_addr_bits_remove (gdbarch, s390_addr_bits_remove);
|
|
set_solib_svr4_fetch_link_map_offsets
|
|
(gdbarch, svr4_ilp32_fetch_link_map_offsets);
|
|
|
|
set_xml_syscall_file_name (gdbarch, XML_SYSCALL_FILENAME_S390);
|
|
break;
|
|
|
|
case ABI_LINUX_ZSERIES:
|
|
set_gdbarch_long_bit (gdbarch, 64);
|
|
set_gdbarch_long_long_bit (gdbarch, 64);
|
|
set_gdbarch_ptr_bit (gdbarch, 64);
|
|
set_solib_svr4_fetch_link_map_offsets
|
|
(gdbarch, svr4_lp64_fetch_link_map_offsets);
|
|
set_gdbarch_address_class_type_flags (gdbarch,
|
|
s390_address_class_type_flags);
|
|
set_gdbarch_address_class_type_flags_to_name (gdbarch,
|
|
s390_address_class_type_flags_to_name);
|
|
set_gdbarch_address_class_name_to_type_flags (gdbarch,
|
|
s390_address_class_name_to_type_flags);
|
|
set_xml_syscall_file_name (gdbarch, XML_SYSCALL_FILENAME_S390X);
|
|
break;
|
|
}
|
|
|
|
set_gdbarch_print_insn (gdbarch, print_insn_s390);
|
|
|
|
set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
|
|
|
|
/* Enable TLS support. */
|
|
set_gdbarch_fetch_tls_load_module_address (gdbarch,
|
|
svr4_fetch_objfile_link_map);
|
|
|
|
set_gdbarch_get_siginfo_type (gdbarch, linux_get_siginfo_type);
|
|
|
|
/* SystemTap functions. */
|
|
set_gdbarch_stap_register_prefixes (gdbarch, stap_register_prefixes);
|
|
set_gdbarch_stap_register_indirection_prefixes (gdbarch,
|
|
stap_register_indirection_prefixes);
|
|
set_gdbarch_stap_register_indirection_suffixes (gdbarch,
|
|
stap_register_indirection_suffixes);
|
|
set_gdbarch_stap_is_single_operand (gdbarch, s390_stap_is_single_operand);
|
|
set_gdbarch_gcc_target_options (gdbarch, s390_gcc_target_options);
|
|
set_gdbarch_gnu_triplet_regexp (gdbarch, s390_gnu_triplet_regexp);
|
|
|
|
return gdbarch;
|
|
}
|
|
|
|
|
|
extern initialize_file_ftype _initialize_s390_tdep; /* -Wmissing-prototypes */
|
|
|
|
void
|
|
_initialize_s390_tdep (void)
|
|
{
|
|
/* Hook us into the gdbarch mechanism. */
|
|
register_gdbarch_init (bfd_arch_s390, s390_gdbarch_init);
|
|
|
|
/* Initialize the GNU/Linux target descriptions. */
|
|
initialize_tdesc_s390_linux32 ();
|
|
initialize_tdesc_s390_linux32v1 ();
|
|
initialize_tdesc_s390_linux32v2 ();
|
|
initialize_tdesc_s390_linux64 ();
|
|
initialize_tdesc_s390_linux64v1 ();
|
|
initialize_tdesc_s390_linux64v2 ();
|
|
initialize_tdesc_s390_te_linux64 ();
|
|
initialize_tdesc_s390_vx_linux64 ();
|
|
initialize_tdesc_s390_tevx_linux64 ();
|
|
initialize_tdesc_s390x_linux64 ();
|
|
initialize_tdesc_s390x_linux64v1 ();
|
|
initialize_tdesc_s390x_linux64v2 ();
|
|
initialize_tdesc_s390x_te_linux64 ();
|
|
initialize_tdesc_s390x_vx_linux64 ();
|
|
initialize_tdesc_s390x_tevx_linux64 ();
|
|
}
|