f962539ad2
When reading a core file register section which is larger than expected, emit a warning. Assume that a register section usually has exactly the size specified by the regset section iterator. In some special cases this assumption is wrong, or at least does not match the regset supply function's logic. Thus also add a way to suppress the warning in those cases, using a new flag REGSET_VARIABLE_SIZE. gdb/ChangeLog: * regset.h (struct regset): Add flags field. (REGSET_VARIABLE_SIZE): New value for a regset's flags field. * corelow.c (get_core_register_section): Add warning if the size exceeds the requested size and the regset does not have the REGSET_VARIABLE_SIZE flag set. * alphanbsd-tdep.c (alphanbsd_gregset): Add REGSET_VARIABLE_SIZE flag. * armbsd-tdep.c (armbsd_gregset): Likewise. * hppa-hpux-tdep.c (hppa_hpux_regset): Likewise. * hppaobsd-tdep.c (hppaobsd_gregset): Likewise. * m68kbsd-tdep.c (m68kbsd_gregset): Likewise. * mipsnbsd-tdep.c (mipsnbsd_gregset): Likewise.
304 lines
8.5 KiB
C
304 lines
8.5 KiB
C
/* Target-dependent code for NetBSD/alpha.
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Copyright (C) 2002-2015 Free Software Foundation, Inc.
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Contributed by Wasabi Systems, 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 "gdbcore.h"
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#include "osabi.h"
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#include "regcache.h"
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#include "regset.h"
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#include "value.h"
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#include "alpha-tdep.h"
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#include "alphabsd-tdep.h"
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#include "nbsd-tdep.h"
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#include "solib-svr4.h"
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#include "target.h"
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/* Core file support. */
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/* Even though NetBSD/alpha used ELF since day one, it used the
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traditional a.out-style core dump format before NetBSD 1.6. */
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/* Sizeof `struct reg' in <machine/reg.h>. */
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#define ALPHANBSD_SIZEOF_GREGS (32 * 8)
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/* Sizeof `struct fpreg' in <machine/reg.h. */
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#define ALPHANBSD_SIZEOF_FPREGS ((32 * 8) + 8)
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/* Supply register REGNUM from the buffer specified by FPREGS and LEN
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in the floating-point register set REGSET to register cache
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REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
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static void
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alphanbsd_supply_fpregset (const struct regset *regset,
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struct regcache *regcache,
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int regnum, const void *fpregs, size_t len)
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{
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const gdb_byte *regs = fpregs;
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int i;
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gdb_assert (len >= ALPHANBSD_SIZEOF_FPREGS);
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for (i = ALPHA_FP0_REGNUM; i < ALPHA_FP0_REGNUM + 31; i++)
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{
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if (regnum == i || regnum == -1)
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regcache_raw_supply (regcache, i, regs + (i - ALPHA_FP0_REGNUM) * 8);
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}
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if (regnum == ALPHA_FPCR_REGNUM || regnum == -1)
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regcache_raw_supply (regcache, ALPHA_FPCR_REGNUM, regs + 32 * 8);
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}
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/* Supply register REGNUM from the buffer specified by GREGS and LEN
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in the general-purpose register set REGSET to register cache
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REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
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static void
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alphanbsd_aout_supply_gregset (const struct regset *regset,
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struct regcache *regcache,
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int regnum, const void *gregs, size_t len)
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{
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const gdb_byte *regs = gregs;
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int i;
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/* Table to map a GDB register number to a trapframe register index. */
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static const int regmap[] =
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{
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0, 1, 2, 3,
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4, 5, 6, 7,
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8, 9, 10, 11,
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12, 13, 14, 15,
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30, 31, 32, 16,
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17, 18, 19, 20,
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21, 22, 23, 24,
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25, 29, 26
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};
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gdb_assert (len >= ALPHANBSD_SIZEOF_GREGS);
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for (i = 0; i < ARRAY_SIZE(regmap); i++)
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{
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if (regnum == i || regnum == -1)
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regcache_raw_supply (regcache, i, regs + regmap[i] * 8);
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}
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if (regnum == ALPHA_PC_REGNUM || regnum == -1)
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regcache_raw_supply (regcache, ALPHA_PC_REGNUM, regs + 31 * 8);
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if (len >= ALPHANBSD_SIZEOF_GREGS + ALPHANBSD_SIZEOF_FPREGS)
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{
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regs += ALPHANBSD_SIZEOF_GREGS;
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len -= ALPHANBSD_SIZEOF_GREGS;
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alphanbsd_supply_fpregset (regset, regcache, regnum, regs, len);
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}
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}
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/* Supply register REGNUM from the buffer specified by GREGS and LEN
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in the general-purpose register set REGSET to register cache
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REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
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static void
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alphanbsd_supply_gregset (const struct regset *regset,
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struct regcache *regcache,
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int regnum, const void *gregs, size_t len)
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{
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const gdb_byte *regs = gregs;
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int i;
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if (len >= ALPHANBSD_SIZEOF_GREGS + ALPHANBSD_SIZEOF_FPREGS)
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{
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alphanbsd_aout_supply_gregset (regset, regcache, regnum, gregs, len);
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return;
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}
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for (i = 0; i < ALPHA_ZERO_REGNUM; i++)
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{
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if (regnum == i || regnum == -1)
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regcache_raw_supply (regcache, i, regs + i * 8);
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}
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if (regnum == ALPHA_PC_REGNUM || regnum == -1)
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regcache_raw_supply (regcache, ALPHA_PC_REGNUM, regs + 31 * 8);
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}
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/* NetBSD/alpha register sets. */
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static const struct regset alphanbsd_gregset =
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{
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NULL,
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alphanbsd_supply_gregset,
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NULL,
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REGSET_VARIABLE_SIZE
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};
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static const struct regset alphanbsd_fpregset =
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{
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NULL,
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alphanbsd_supply_fpregset
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};
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/* Iterate over supported core file register note sections. */
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void
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alphanbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
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iterate_over_regset_sections_cb *cb,
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void *cb_data,
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const struct regcache *regcache)
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{
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cb (".reg", ALPHANBSD_SIZEOF_GREGS, &alphanbsd_gregset, NULL, cb_data);
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cb (".reg2", ALPHANBSD_SIZEOF_FPREGS, &alphanbsd_fpregset, NULL, cb_data);
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}
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/* Signal trampolines. */
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/* Under NetBSD/alpha, signal handler invocations can be identified by the
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designated code sequence that is used to return from a signal handler.
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In particular, the return address of a signal handler points to the
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following code sequence:
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ldq a0, 0(sp)
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lda sp, 16(sp)
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lda v0, 295(zero) # __sigreturn14
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call_pal callsys
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Each instruction has a unique encoding, so we simply attempt to match
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the instruction the PC is pointing to with any of the above instructions.
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If there is a hit, we know the offset to the start of the designated
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sequence and can then check whether we really are executing in the
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signal trampoline. If not, -1 is returned, otherwise the offset from the
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start of the return sequence is returned. */
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static const gdb_byte sigtramp_retcode[] =
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{
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0x00, 0x00, 0x1e, 0xa6, /* ldq a0, 0(sp) */
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0x10, 0x00, 0xde, 0x23, /* lda sp, 16(sp) */
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0x27, 0x01, 0x1f, 0x20, /* lda v0, 295(zero) */
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0x83, 0x00, 0x00, 0x00, /* call_pal callsys */
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};
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#define RETCODE_NWORDS 4
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#define RETCODE_SIZE (RETCODE_NWORDS * 4)
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static LONGEST
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alphanbsd_sigtramp_offset (struct gdbarch *gdbarch, CORE_ADDR pc)
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{
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gdb_byte ret[RETCODE_SIZE], w[4];
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LONGEST off;
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int i;
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if (target_read_memory (pc, w, 4) != 0)
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return -1;
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for (i = 0; i < RETCODE_NWORDS; i++)
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{
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if (memcmp (w, sigtramp_retcode + (i * 4), 4) == 0)
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break;
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}
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if (i == RETCODE_NWORDS)
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return (-1);
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off = i * 4;
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pc -= off;
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if (target_read_memory (pc, ret, sizeof (ret)) != 0)
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return -1;
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if (memcmp (ret, sigtramp_retcode, RETCODE_SIZE) == 0)
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return off;
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return -1;
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}
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static int
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alphanbsd_pc_in_sigtramp (struct gdbarch *gdbarch,
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CORE_ADDR pc, const char *func_name)
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{
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return (nbsd_pc_in_sigtramp (pc, func_name)
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|| alphanbsd_sigtramp_offset (gdbarch, pc) >= 0);
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}
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static CORE_ADDR
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alphanbsd_sigcontext_addr (struct frame_info *frame)
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{
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/* FIXME: This is not correct for all versions of NetBSD/alpha.
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We will probably need to disassemble the trampoline to figure
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out which trampoline frame type we have. */
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if (!get_next_frame (frame))
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return 0;
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return get_frame_base (get_next_frame (frame));
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}
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static void
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alphanbsd_init_abi (struct gdbarch_info info,
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struct gdbarch *gdbarch)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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/* Hook into the DWARF CFI frame unwinder. */
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alpha_dwarf2_init_abi (info, gdbarch);
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/* Hook into the MDEBUG frame unwinder. */
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alpha_mdebug_init_abi (info, gdbarch);
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/* NetBSD/alpha does not provide single step support via ptrace(2); we
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must use software single-stepping. */
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set_gdbarch_software_single_step (gdbarch, alpha_software_single_step);
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/* NetBSD/alpha has SVR4-style shared libraries. */
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set_solib_svr4_fetch_link_map_offsets
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(gdbarch, svr4_lp64_fetch_link_map_offsets);
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tdep->dynamic_sigtramp_offset = alphanbsd_sigtramp_offset;
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tdep->pc_in_sigtramp = alphanbsd_pc_in_sigtramp;
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tdep->sigcontext_addr = alphanbsd_sigcontext_addr;
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tdep->jb_pc = 2;
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tdep->jb_elt_size = 8;
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set_gdbarch_iterate_over_regset_sections
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(gdbarch, alphanbsd_iterate_over_regset_sections);
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}
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static enum gdb_osabi
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alphanbsd_core_osabi_sniffer (bfd *abfd)
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{
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if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
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return GDB_OSABI_NETBSD_ELF;
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return GDB_OSABI_UNKNOWN;
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}
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/* Provide a prototype to silence -Wmissing-prototypes. */
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void _initialize_alphanbsd_tdep (void);
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void
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_initialize_alphanbsd_tdep (void)
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{
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/* BFD doesn't set a flavour for NetBSD style a.out core files. */
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gdbarch_register_osabi_sniffer (bfd_arch_alpha, bfd_target_unknown_flavour,
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alphanbsd_core_osabi_sniffer);
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gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_NETBSD_ELF,
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alphanbsd_init_abi);
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}
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