mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-15 04:31:49 +08:00
6ff330351e
NetBSD switched to ucontext, back in 2003 and the sigcontext code
is no longer available for users, except for legacy compat layers.
This code was not available anyway as the pre-processor check
was probably never operational and buildable on NetBSD. The code
inside it does not compile.
Meanwhile, move the offset variable into the ifdef goards and avoid
the error about unused variable.
../../gdb/i386-bsd-nat.c: In function 'void _initialize_i386bsd_nat()':
../../gdb/i386-bsd-nat.c:347:7: error: unused variable 'offset' [-Werror=unused-variable]
347 | int offset;
| ^~~~~~
cc1plus: all warnings being treated as errors
gdb/ChangeLog:
* i386-bsd-nat.c (_initialize_i386bsd_nat): Update.
* i386-nbsd-tdep.c (i386nbsd_sc_reg_offset): Now static.
415 lines
11 KiB
C
415 lines
11 KiB
C
/* Native-dependent code for modern i386 BSD's.
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Copyright (C) 2000-2020 Free Software Foundation, 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 "inferior.h"
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#include "regcache.h"
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#include <signal.h>
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#include <sys/types.h>
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#include <sys/ptrace.h>
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#include <machine/reg.h>
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#include <machine/frame.h>
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#include "i386-tdep.h"
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#include "i387-tdep.h"
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#include "x86-bsd-nat.h"
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#include "i386-bsd-nat.h"
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#include "inf-ptrace.h"
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static PTRACE_TYPE_RET
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gdb_ptrace (PTRACE_TYPE_ARG1 request, ptid_t ptid, PTRACE_TYPE_ARG3 addr,
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PTRACE_TYPE_ARG4 data)
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{
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#ifdef __NetBSD__
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gdb_assert (data == 0);
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/* Support for NetBSD threads: unlike other ptrace implementations in this
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file, NetBSD requires that we pass both the pid and lwp. */
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return ptrace (request, ptid.pid (), addr, ptid.lwp ());
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#else
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pid_t pid = get_ptrace_pid (ptid);
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return ptrace (request, pid, addr, data);
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#endif
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}
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/* In older BSD versions we cannot get at some of the segment
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registers. FreeBSD for example didn't support the %fs and %gs
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registers until the 3.0 release. We have autoconf checks for their
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presence, and deal gracefully with their absence. */
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/* Offset in `struct reg' where MEMBER is stored. */
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#define REG_OFFSET(member) offsetof (struct reg, member)
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/* At i386bsd_reg_offset[REGNUM] you'll find the offset in `struct
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reg' where the GDB register REGNUM is stored. Unsupported
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registers are marked with `-1'. */
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static int i386bsd_r_reg_offset[] =
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{
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REG_OFFSET (r_eax),
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REG_OFFSET (r_ecx),
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REG_OFFSET (r_edx),
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REG_OFFSET (r_ebx),
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REG_OFFSET (r_esp),
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REG_OFFSET (r_ebp),
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REG_OFFSET (r_esi),
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REG_OFFSET (r_edi),
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REG_OFFSET (r_eip),
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REG_OFFSET (r_eflags),
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REG_OFFSET (r_cs),
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REG_OFFSET (r_ss),
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REG_OFFSET (r_ds),
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REG_OFFSET (r_es),
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#ifdef HAVE_STRUCT_REG_R_FS
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REG_OFFSET (r_fs),
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#else
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-1,
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#endif
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#ifdef HAVE_STRUCT_REG_R_GS
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REG_OFFSET (r_gs)
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#else
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-1
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#endif
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};
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/* Macro to determine if a register is fetched with PT_GETREGS. */
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#define GETREGS_SUPPLIES(regnum) \
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((0 <= (regnum) && (regnum) <= 15))
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#ifdef HAVE_PT_GETXMMREGS
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/* Set to 1 if the kernel supports PT_GETXMMREGS. Initialized to -1
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so that we try PT_GETXMMREGS the first time around. */
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static int have_ptrace_xmmregs = -1;
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#endif
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/* Supply the general-purpose registers in GREGS, to REGCACHE. */
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static void
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i386bsd_supply_gregset (struct regcache *regcache, const void *gregs)
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{
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const char *regs = (const char *) gregs;
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int regnum;
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for (regnum = 0; regnum < ARRAY_SIZE (i386bsd_r_reg_offset); regnum++)
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{
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int offset = i386bsd_r_reg_offset[regnum];
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if (offset != -1)
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regcache->raw_supply (regnum, regs + offset);
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}
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}
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/* Collect register REGNUM from REGCACHE and store its contents in
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GREGS. If REGNUM is -1, collect and store all appropriate
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registers. */
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static void
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i386bsd_collect_gregset (const struct regcache *regcache,
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void *gregs, int regnum)
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{
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char *regs = (char *) gregs;
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int i;
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for (i = 0; i < ARRAY_SIZE (i386bsd_r_reg_offset); i++)
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{
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if (regnum == -1 || regnum == i)
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{
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int offset = i386bsd_r_reg_offset[i];
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if (offset != -1)
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regcache->raw_collect (i, regs + offset);
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}
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}
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}
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/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
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for all registers (including the floating point registers). */
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void
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i386bsd_fetch_inferior_registers (struct regcache *regcache, int regnum)
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{
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ptid_t ptid = regcache->ptid ();
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if (regnum == -1 || GETREGS_SUPPLIES (regnum))
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{
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struct reg regs;
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if (gdb_ptrace (PT_GETREGS, ptid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
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perror_with_name (_("Couldn't get registers"));
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i386bsd_supply_gregset (regcache, ®s);
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if (regnum != -1)
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return;
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}
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#ifdef PT_GETFSBASE
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if (regnum == -1 || regnum == I386_FSBASE_REGNUM)
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{
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register_t base;
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if (gdb_ptrace (PT_GETFSBASE, ptid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
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perror_with_name (_("Couldn't get segment register fs_base"));
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regcache->raw_supply (I386_FSBASE_REGNUM, &base);
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if (regnum != -1)
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return;
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}
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#endif
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#ifdef PT_GETGSBASE
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if (regnum == -1 || regnum == I386_GSBASE_REGNUM)
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{
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register_t base;
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if (gdb_ptrace (PT_GETGSBASE, ptid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
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perror_with_name (_("Couldn't get segment register gs_base"));
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regcache->raw_supply (I386_GSBASE_REGNUM, &base);
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if (regnum != -1)
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return;
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}
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#endif
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if (regnum == -1 || regnum >= I386_ST0_REGNUM)
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{
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struct fpreg fpregs;
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#ifdef HAVE_PT_GETXMMREGS
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char xmmregs[512];
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#endif
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#ifdef PT_GETXSTATE_INFO
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if (x86bsd_xsave_len != 0)
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{
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void *xstateregs;
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xstateregs = alloca (x86bsd_xsave_len);
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if (gdb_ptrace (PT_GETXSTATE, ptid,
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(PTRACE_TYPE_ARG3) xstateregs, 0) == -1)
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perror_with_name (_("Couldn't get extended state status"));
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i387_supply_xsave (regcache, -1, xstateregs);
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return;
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}
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#endif
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#ifdef HAVE_PT_GETXMMREGS
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if (have_ptrace_xmmregs != 0
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&& gdb_ptrace(PT_GETXMMREGS, ptid,
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(PTRACE_TYPE_ARG3) xmmregs, 0) == 0)
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{
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have_ptrace_xmmregs = 1;
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i387_supply_fxsave (regcache, -1, xmmregs);
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}
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else
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{
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have_ptrace_xmmregs = 0;
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#endif
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if (gdb_ptrace (PT_GETFPREGS, ptid,
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(PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
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perror_with_name (_("Couldn't get floating point status"));
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i387_supply_fsave (regcache, -1, &fpregs);
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#ifdef HAVE_PT_GETXMMREGS
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}
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#endif
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}
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}
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/* Store register REGNUM back into the inferior. If REGNUM is -1, do
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this for all registers (including the floating point registers). */
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void
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i386bsd_store_inferior_registers (struct regcache *regcache, int regnum)
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{
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ptid_t ptid = regcache->ptid ();
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if (regnum == -1 || GETREGS_SUPPLIES (regnum))
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{
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struct reg regs;
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if (gdb_ptrace (PT_GETREGS, ptid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
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perror_with_name (_("Couldn't get registers"));
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i386bsd_collect_gregset (regcache, ®s, regnum);
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if (gdb_ptrace (PT_SETREGS, ptid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
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perror_with_name (_("Couldn't write registers"));
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if (regnum != -1)
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return;
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}
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#ifdef PT_SETFSBASE
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if (regnum == -1 || regnum == I386_FSBASE_REGNUM)
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{
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register_t base;
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regcache->raw_collect (I386_FSBASE_REGNUM, &base);
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if (gdb_ptrace (PT_SETFSBASE, ptid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
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perror_with_name (_("Couldn't write segment register fs_base"));
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if (regnum != -1)
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return;
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}
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#endif
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#ifdef PT_SETGSBASE
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if (regnum == -1 || regnum == I386_GSBASE_REGNUM)
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{
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register_t base;
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regcache->raw_collect (I386_GSBASE_REGNUM, &base);
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if (gdb_ptrace (PT_SETGSBASE, ptid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
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perror_with_name (_("Couldn't write segment register gs_base"));
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if (regnum != -1)
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return;
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}
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#endif
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if (regnum == -1 || regnum >= I386_ST0_REGNUM)
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{
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struct fpreg fpregs;
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#ifdef HAVE_PT_GETXMMREGS
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char xmmregs[512];
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#endif
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#ifdef PT_GETXSTATE_INFO
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if (x86bsd_xsave_len != 0)
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{
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void *xstateregs;
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xstateregs = alloca (x86bsd_xsave_len);
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if (gdb_ptrace (PT_GETXSTATE, ptid,
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(PTRACE_TYPE_ARG3) xstateregs, 0) == -1)
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perror_with_name (_("Couldn't get extended state status"));
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i387_collect_xsave (regcache, -1, xstateregs, 0);
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if (gdb_ptrace (PT_SETXSTATE, ptid, (PTRACE_TYPE_ARG3) xstateregs,
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x86bsd_xsave_len) == -1)
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perror_with_name (_("Couldn't write extended state status"));
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return;
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}
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#endif
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#ifdef HAVE_PT_GETXMMREGS
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if (have_ptrace_xmmregs != 0
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&& gdb_ptrace(PT_GETXMMREGS, ptid,
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(PTRACE_TYPE_ARG3) xmmregs, 0) == 0)
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{
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have_ptrace_xmmregs = 1;
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i387_collect_fxsave (regcache, regnum, xmmregs);
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if (gdb_ptrace (PT_SETXMMREGS, ptid,
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(PTRACE_TYPE_ARG3) xmmregs, 0) == -1)
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perror_with_name (_("Couldn't write XMM registers"));
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}
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else
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{
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have_ptrace_xmmregs = 0;
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#endif
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if (gdb_ptrace (PT_GETFPREGS, ptid,
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(PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
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perror_with_name (_("Couldn't get floating point status"));
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i387_collect_fsave (regcache, regnum, &fpregs);
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if (gdb_ptrace (PT_SETFPREGS, ptid,
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(PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
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perror_with_name (_("Couldn't write floating point status"));
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#ifdef HAVE_PT_GETXMMREGS
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}
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#endif
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}
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}
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void _initialize_i386bsd_nat ();
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void
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_initialize_i386bsd_nat ()
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{
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/* To support the recognition of signal handlers, i386-bsd-tdep.c
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hardcodes some constants. Inclusion of this file means that we
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are compiling a native debugger, which means that we can use the
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system header files and sysctl(3) to get at the relevant
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information. */
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#if defined (__FreeBSD_version) && __FreeBSD_version >= 400011
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#define SC_REG_OFFSET i386fbsd4_sc_reg_offset
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#elif defined (__FreeBSD_version) && __FreeBSD_version >= 300005
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#define SC_REG_OFFSET i386fbsd_sc_reg_offset
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#elif defined (OpenBSD)
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#define SC_REG_OFFSET i386obsd_sc_reg_offset
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#endif
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#ifdef SC_REG_OFFSET
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/* We only check the program counter, stack pointer and frame
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pointer since these members of `struct sigcontext' are essential
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for providing backtraces. More checks could be added, but would
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involve adding configure checks for the appropriate structure
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members, since older BSD's don't provide all of them. */
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#define SC_PC_OFFSET SC_REG_OFFSET[I386_EIP_REGNUM]
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#define SC_SP_OFFSET SC_REG_OFFSET[I386_ESP_REGNUM]
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#define SC_FP_OFFSET SC_REG_OFFSET[I386_EBP_REGNUM]
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/* Override the default value for the offset of the program counter
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in the sigcontext structure. */
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int offset = offsetof (struct sigcontext, sc_pc);
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if (SC_PC_OFFSET != offset)
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{
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warning (_("\
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offsetof (struct sigcontext, sc_pc) yields %d instead of %d.\n\
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Please report this to <bug-gdb@gnu.org>."),
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offset, SC_PC_OFFSET);
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}
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SC_PC_OFFSET = offset;
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/* Likewise for the stack pointer. */
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offset = offsetof (struct sigcontext, sc_sp);
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if (SC_SP_OFFSET != offset)
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{
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warning (_("\
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offsetof (struct sigcontext, sc_sp) yields %d instead of %d.\n\
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Please report this to <bug-gdb@gnu.org>."),
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offset, SC_SP_OFFSET);
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}
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SC_SP_OFFSET = offset;
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/* And the frame pointer. */
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offset = offsetof (struct sigcontext, sc_fp);
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if (SC_FP_OFFSET != offset)
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{
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warning (_("\
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offsetof (struct sigcontext, sc_fp) yields %d instead of %d.\n\
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Please report this to <bug-gdb@gnu.org>."),
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offset, SC_FP_OFFSET);
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}
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SC_FP_OFFSET = offset;
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#endif /* SC_REG_OFFSET */
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}
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