a1217d97c4
Andrew Jenner <andrew@codesourcery.com> Chung-Lin Tang <cltang@codesourcery.com> Julian Brown <julian@codesourcery.com> Based on the nios2-elf port from Altera Corporation. gdb/ * Makefile.in (ALL_TARGET_OBS): Add nios2-tdep.o and nios2-linux-tdep.o. (HFILES_NO_SRCDIR): Add nios2-tdep.h. (ALLDEPFILES): Add nios2-tdep.c and nios2-linux-tdep.c. * configure.tgt: Add nios2*-*-linux* and nios2*-*-* targets. * nios2-tdep.h: New. * nios2-tdep.c: New. * nios2-linux-tdep.c: New. * features/Makefile (WHICH): Add nios2-linux. (nios2-linux-expedite): Set. * features/nios2-cpu.xml: New. * features/nios2.xml: New. * features/nios2-linux.xml: New. * features/nios2.c: New (autogenerated). * features/nios2-linux.c: New (autogenerated). * regformats/nios2-linux.dat: New (autogenerated). * NEWS (Changes since GDB 7.6): Add new Nios II targets and commands. gdb/doc/ * gdb.texinfo (Nios II): New section. (Nios II Features): New section.
233 lines
7.3 KiB
C
233 lines
7.3 KiB
C
/* Target-dependent code for GNU/Linux on Nios II.
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Copyright (C) 2012-2013 Free Software Foundation, Inc.
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Contributed by Mentor Graphics, Inc.
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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 "frame.h"
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#include "gdb_assert.h"
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#include "gdb_string.h"
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#include "osabi.h"
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#include "solib-svr4.h"
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#include "trad-frame.h"
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#include "tramp-frame.h"
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#include "symtab.h"
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#include "regset.h"
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#include "regcache.h"
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#include "linux-tdep.h"
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#include "glibc-tdep.h"
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#include "nios2-tdep.h"
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#include "features/nios2-linux.c"
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/* Core file and register set support. */
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/* Map from the normal register enumeration order to the order that
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registers appear in core files, which corresponds to the order
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of the register slots in the kernel's struct pt_regs. */
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static const int reg_offsets[NIOS2_NUM_REGS] =
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{
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-1, 8, 9, 10, 11, 12, 13, 14, /* r0 - r7 */
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0, 1, 2, 3, 4, 5, 6, 7, /* r8 - r15 */
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23, 24, 25, 26, 27, 28, 29, 30, /* r16 - r23 */
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-1, -1, 19, 18, 17, 21, -1, 16, /* et bt gp sp fp ea ba ra */
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21, /* pc */
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-1, 20, -1, -1, -1, -1, -1, -1, /* status estatus ... */
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-1, -1, -1, -1, -1, -1, -1, -1
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};
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/* Implement the supply_regset hook for core files. */
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static void
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nios2_supply_gregset (const struct regset *regset,
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struct regcache *regcache,
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int regnum, const void *gregs_buf, size_t len)
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{
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const gdb_byte *gregs = gregs_buf;
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int regno;
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static const gdb_byte zero_buf[4] = {0, 0, 0, 0};
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for (regno = NIOS2_Z_REGNUM; regno <= NIOS2_MPUACC_REGNUM; regno++)
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if (regnum == -1 || regnum == regno)
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{
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if (reg_offsets[regno] != -1)
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regcache_raw_supply (regcache, regno,
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gregs + 4 * reg_offsets[regno]);
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else
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regcache_raw_supply (regcache, regno, zero_buf);
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}
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}
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static struct regset nios2_core_regset =
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{
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NULL,
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nios2_supply_gregset,
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NULL,
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NULL
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};
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/* Implement the regset_from_core_section gdbarch method. */
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static const struct regset *
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nios2_regset_from_core_section (struct gdbarch *gdbarch,
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const char *sect_name, size_t sect_size)
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{
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if (strcmp (sect_name, ".reg") == 0)
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return &nios2_core_regset;
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return NULL;
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}
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/* Initialize a trad-frame cache corresponding to the tramp-frame.
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FUNC is the address of the instruction TRAMP[0] in memory. */
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static void
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nios2_linux_sigreturn_init (const struct tramp_frame *self,
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struct frame_info *next_frame,
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struct trad_frame_cache *this_cache,
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CORE_ADDR func)
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{
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CORE_ADDR base = func + 16;
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int i;
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for (i = 0; i < 8; i++)
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trad_frame_set_reg_addr (this_cache, i + 8, base + i * 4);
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for (i = 0; i < 7; i++)
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trad_frame_set_reg_addr (this_cache, i + 1, base + (i + 8) * 4);
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trad_frame_set_reg_addr (this_cache, NIOS2_RA_REGNUM, base + 16 * 4);
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trad_frame_set_reg_addr (this_cache, NIOS2_FP_REGNUM, base + 17 * 4);
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trad_frame_set_reg_addr (this_cache, NIOS2_SP_REGNUM, base + 18 * 4);
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trad_frame_set_reg_addr (this_cache, NIOS2_GP_REGNUM, base + 19 * 4);
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trad_frame_set_reg_addr (this_cache, NIOS2_ESTATUS_REGNUM, base + 20 * 4);
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trad_frame_set_reg_addr (this_cache, NIOS2_PC_REGNUM, base + 21 * 4);
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/* Save a frame ID. */
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trad_frame_set_id (this_cache, frame_id_build (base, func));
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}
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/* Initialize a trad-frame cache corresponding to the tramp-frame.
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FUNC is the address of the instruction TRAMP[0] in memory. */
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static void
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nios2_linux_rt_sigreturn_init (const struct tramp_frame *self,
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struct frame_info *next_frame,
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struct trad_frame_cache *this_cache,
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CORE_ADDR func)
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{
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CORE_ADDR base = func + 41 * 4;
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int i;
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for (i = 0; i < 23; i++)
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trad_frame_set_reg_addr (this_cache, i + 1, base + i * 4);
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trad_frame_set_reg_addr (this_cache, NIOS2_RA_REGNUM, base + 23 * 4);
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trad_frame_set_reg_addr (this_cache, NIOS2_FP_REGNUM, base + 24 * 4);
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trad_frame_set_reg_addr (this_cache, NIOS2_GP_REGNUM, base + 25 * 4);
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trad_frame_set_reg_addr (this_cache, NIOS2_PC_REGNUM, base + 27 * 4);
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trad_frame_set_reg_addr (this_cache, NIOS2_SP_REGNUM, base + 28 * 4);
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/* Save a frame ID. */
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trad_frame_set_id (this_cache, frame_id_build (base, func));
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}
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static struct tramp_frame nios2_linux_sigreturn_tramp_frame =
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{
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SIGTRAMP_FRAME,
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4,
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{
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{ 0x00800004 | (119 << 6), -1 }, /* movi r2,__NR_sigreturn */
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{ 0x003b683a, -1 }, /* trap */
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{ TRAMP_SENTINEL_INSN }
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},
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nios2_linux_sigreturn_init
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};
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static struct tramp_frame nios2_linux_rt_sigreturn_tramp_frame =
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{
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SIGTRAMP_FRAME,
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4,
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{
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{ 0x00800004 | (173 << 6), -1 }, /* movi r2,__NR_rt_sigreturn */
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{ 0x003b683a, -1 }, /* trap */
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{ TRAMP_SENTINEL_INSN }
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},
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nios2_linux_rt_sigreturn_init
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};
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/* When FRAME is at a syscall instruction, return the PC of the next
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instruction to be executed. */
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static CORE_ADDR
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nios2_linux_syscall_next_pc (struct frame_info *frame)
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{
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CORE_ADDR pc = get_frame_pc (frame);
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ULONGEST syscall_nr = get_frame_register_unsigned (frame, NIOS2_R2_REGNUM);
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/* If we are about to make a sigreturn syscall, use the unwinder to
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decode the signal frame. */
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if (syscall_nr == 119 /* sigreturn */
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|| syscall_nr == 173 /* rt_sigreturn */)
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return frame_unwind_caller_pc (frame);
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return pc + NIOS2_OPCODE_SIZE;
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}
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/* Hook function for gdbarch_register_osabi. */
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static void
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nios2_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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linux_init_abi (info, gdbarch);
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/* Shared library handling. */
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set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
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set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver);
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set_solib_svr4_fetch_link_map_offsets (gdbarch,
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svr4_ilp32_fetch_link_map_offsets);
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/* Enable TLS support. */
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set_gdbarch_fetch_tls_load_module_address (gdbarch,
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svr4_fetch_objfile_link_map);
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/* Core file support. */
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set_gdbarch_regset_from_core_section (gdbarch,
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nios2_regset_from_core_section);
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/* Linux signal frame unwinders. */
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tramp_frame_prepend_unwinder (gdbarch,
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&nios2_linux_sigreturn_tramp_frame);
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tramp_frame_prepend_unwinder (gdbarch,
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&nios2_linux_rt_sigreturn_tramp_frame);
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tdep->syscall_next_pc = nios2_linux_syscall_next_pc;
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/* Index of target address word in glibc jmp_buf. */
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tdep->jb_pc = 10;
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}
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/* Provide a prototype to silence -Wmissing-prototypes. */
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extern initialize_file_ftype _initialize_nios2_linux_tdep;
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void
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_initialize_nios2_linux_tdep (void)
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{
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gdbarch_register_osabi (bfd_arch_nios2, 0, GDB_OSABI_LINUX,
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nios2_linux_init_abi);
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initialize_tdesc_nios2_linux ();
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}
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