mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-06 00:34:26 +08:00
dd6876c91c
The i386 BSD native target uses the same ptrace operations (PT_[GS]ET[FG]SBASE) as the amd64 BSD native target to fetch and store the registers. The amd64 BSD native now uses 'tdep->fsbase_regnum' instead of hardcoding AMD64_FSBASE_REGNUM and AMD64_GSBASE_REGNUM to support 32-bit targets. In addition, the store operations explicitly zero the new register value before fetching it from the register cache to ensure 32-bit values are zero-extended. gdb/ChangeLog: * amd64-bsd-nat.c (amd64bsd_fetch_inferior_registers): Use tdep->fsbase_regnum instead of constants for fs_base and gs_base. (amd64bsd_store_inferior_registers): Likewise. * amd64-fbsd-nat.c (amd64_fbsd_nat_target::read_description): Enable segment base registers. * i386-bsd-nat.c (i386bsd_fetch_inferior_registers): Use PT_GETFSBASE and PT_GETGSBASE. (i386bsd_store_inferior_registers): Use PT_SETFSBASE and PT_SETGSBASE. * i386-fbsd-nat.c (i386_fbsd_nat_target::read_description): Enable segment base registers. * i386-fbsd-tdep.c (i386fbsd_core_read_description): Likewise.
397 lines
10 KiB
C
397 lines
10 KiB
C
/* Native-dependent code for modern i386 BSD's.
|
||
|
||
Copyright (C) 2000-2019 Free Software Foundation, Inc.
|
||
|
||
This file is part of GDB.
|
||
|
||
This program is free software; you can redistribute it and/or modify
|
||
it under the terms of the GNU General Public License as published by
|
||
the Free Software Foundation; either version 3 of the License, or
|
||
(at your option) any later version.
|
||
|
||
This program is distributed in the hope that it will be useful,
|
||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
GNU General Public License for more details.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with this program. If not, see <http://www.gnu.org/licenses/>. */
|
||
|
||
#include "defs.h"
|
||
#include "inferior.h"
|
||
#include "regcache.h"
|
||
|
||
#include <signal.h>
|
||
#include <sys/types.h>
|
||
#include <sys/ptrace.h>
|
||
#include <machine/reg.h>
|
||
#include <machine/frame.h>
|
||
|
||
#include "i386-tdep.h"
|
||
#include "i387-tdep.h"
|
||
#include "x86-bsd-nat.h"
|
||
#include "i386-bsd-nat.h"
|
||
#include "inf-ptrace.h"
|
||
|
||
|
||
/* In older BSD versions we cannot get at some of the segment
|
||
registers. FreeBSD for example didn't support the %fs and %gs
|
||
registers until the 3.0 release. We have autoconf checks for their
|
||
presence, and deal gracefully with their absence. */
|
||
|
||
/* Offset in `struct reg' where MEMBER is stored. */
|
||
#define REG_OFFSET(member) offsetof (struct reg, member)
|
||
|
||
/* At i386bsd_reg_offset[REGNUM] you'll find the offset in `struct
|
||
reg' where the GDB register REGNUM is stored. Unsupported
|
||
registers are marked with `-1'. */
|
||
static int i386bsd_r_reg_offset[] =
|
||
{
|
||
REG_OFFSET (r_eax),
|
||
REG_OFFSET (r_ecx),
|
||
REG_OFFSET (r_edx),
|
||
REG_OFFSET (r_ebx),
|
||
REG_OFFSET (r_esp),
|
||
REG_OFFSET (r_ebp),
|
||
REG_OFFSET (r_esi),
|
||
REG_OFFSET (r_edi),
|
||
REG_OFFSET (r_eip),
|
||
REG_OFFSET (r_eflags),
|
||
REG_OFFSET (r_cs),
|
||
REG_OFFSET (r_ss),
|
||
REG_OFFSET (r_ds),
|
||
REG_OFFSET (r_es),
|
||
#ifdef HAVE_STRUCT_REG_R_FS
|
||
REG_OFFSET (r_fs),
|
||
#else
|
||
-1,
|
||
#endif
|
||
#ifdef HAVE_STRUCT_REG_R_GS
|
||
REG_OFFSET (r_gs)
|
||
#else
|
||
-1
|
||
#endif
|
||
};
|
||
|
||
/* Macro to determine if a register is fetched with PT_GETREGS. */
|
||
#define GETREGS_SUPPLIES(regnum) \
|
||
((0 <= (regnum) && (regnum) <= 15))
|
||
|
||
#ifdef HAVE_PT_GETXMMREGS
|
||
/* Set to 1 if the kernel supports PT_GETXMMREGS. Initialized to -1
|
||
so that we try PT_GETXMMREGS the first time around. */
|
||
static int have_ptrace_xmmregs = -1;
|
||
#endif
|
||
|
||
|
||
/* Supply the general-purpose registers in GREGS, to REGCACHE. */
|
||
|
||
static void
|
||
i386bsd_supply_gregset (struct regcache *regcache, const void *gregs)
|
||
{
|
||
const char *regs = (const char *) gregs;
|
||
int regnum;
|
||
|
||
for (regnum = 0; regnum < ARRAY_SIZE (i386bsd_r_reg_offset); regnum++)
|
||
{
|
||
int offset = i386bsd_r_reg_offset[regnum];
|
||
|
||
if (offset != -1)
|
||
regcache->raw_supply (regnum, regs + offset);
|
||
}
|
||
}
|
||
|
||
/* Collect register REGNUM from REGCACHE and store its contents in
|
||
GREGS. If REGNUM is -1, collect and store all appropriate
|
||
registers. */
|
||
|
||
static void
|
||
i386bsd_collect_gregset (const struct regcache *regcache,
|
||
void *gregs, int regnum)
|
||
{
|
||
char *regs = (char *) gregs;
|
||
int i;
|
||
|
||
for (i = 0; i < ARRAY_SIZE (i386bsd_r_reg_offset); i++)
|
||
{
|
||
if (regnum == -1 || regnum == i)
|
||
{
|
||
int offset = i386bsd_r_reg_offset[i];
|
||
|
||
if (offset != -1)
|
||
regcache->raw_collect (i, regs + offset);
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
|
||
for all registers (including the floating point registers). */
|
||
|
||
void
|
||
i386bsd_fetch_inferior_registers (struct regcache *regcache, int regnum)
|
||
{
|
||
pid_t pid = get_ptrace_pid (regcache->ptid ());
|
||
|
||
if (regnum == -1 || GETREGS_SUPPLIES (regnum))
|
||
{
|
||
struct reg regs;
|
||
|
||
if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
|
||
perror_with_name (_("Couldn't get registers"));
|
||
|
||
i386bsd_supply_gregset (regcache, ®s);
|
||
if (regnum != -1)
|
||
return;
|
||
}
|
||
|
||
#ifdef PT_GETFSBASE
|
||
if (regnum == -1 || regnum == I386_FSBASE_REGNUM)
|
||
{
|
||
register_t base;
|
||
|
||
if (ptrace (PT_GETFSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
|
||
perror_with_name (_("Couldn't get segment register fs_base"));
|
||
|
||
regcache->raw_supply (I386_FSBASE_REGNUM, &base);
|
||
if (regnum != -1)
|
||
return;
|
||
}
|
||
#endif
|
||
#ifdef PT_GETGSBASE
|
||
if (regnum == -1 || regnum == I386_GSBASE_REGNUM)
|
||
{
|
||
register_t base;
|
||
|
||
if (ptrace (PT_GETGSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
|
||
perror_with_name (_("Couldn't get segment register gs_base"));
|
||
|
||
regcache->raw_supply (I386_GSBASE_REGNUM, &base);
|
||
if (regnum != -1)
|
||
return;
|
||
}
|
||
#endif
|
||
|
||
if (regnum == -1 || regnum >= I386_ST0_REGNUM)
|
||
{
|
||
struct fpreg fpregs;
|
||
#ifdef HAVE_PT_GETXMMREGS
|
||
char xmmregs[512];
|
||
#endif
|
||
|
||
#ifdef PT_GETXSTATE_INFO
|
||
if (x86bsd_xsave_len != 0)
|
||
{
|
||
void *xstateregs;
|
||
|
||
xstateregs = alloca (x86bsd_xsave_len);
|
||
if (ptrace (PT_GETXSTATE, pid,
|
||
(PTRACE_TYPE_ARG3) xstateregs, 0) == -1)
|
||
perror_with_name (_("Couldn't get extended state status"));
|
||
|
||
i387_supply_xsave (regcache, -1, xstateregs);
|
||
return;
|
||
}
|
||
#endif
|
||
|
||
#ifdef HAVE_PT_GETXMMREGS
|
||
if (have_ptrace_xmmregs != 0
|
||
&& ptrace(PT_GETXMMREGS, pid, (PTRACE_TYPE_ARG3) xmmregs, 0) == 0)
|
||
{
|
||
have_ptrace_xmmregs = 1;
|
||
i387_supply_fxsave (regcache, -1, xmmregs);
|
||
}
|
||
else
|
||
{
|
||
have_ptrace_xmmregs = 0;
|
||
#endif
|
||
if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
|
||
perror_with_name (_("Couldn't get floating point status"));
|
||
|
||
i387_supply_fsave (regcache, -1, &fpregs);
|
||
#ifdef HAVE_PT_GETXMMREGS
|
||
}
|
||
#endif
|
||
}
|
||
}
|
||
|
||
/* Store register REGNUM back into the inferior. If REGNUM is -1, do
|
||
this for all registers (including the floating point registers). */
|
||
|
||
void
|
||
i386bsd_store_inferior_registers (struct regcache *regcache, int regnum)
|
||
{
|
||
pid_t pid = get_ptrace_pid (regcache->ptid ());
|
||
|
||
if (regnum == -1 || GETREGS_SUPPLIES (regnum))
|
||
{
|
||
struct reg regs;
|
||
|
||
if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
|
||
perror_with_name (_("Couldn't get registers"));
|
||
|
||
i386bsd_collect_gregset (regcache, ®s, regnum);
|
||
|
||
if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
|
||
perror_with_name (_("Couldn't write registers"));
|
||
|
||
if (regnum != -1)
|
||
return;
|
||
}
|
||
|
||
#ifdef PT_SETFSBASE
|
||
if (regnum == -1 || regnum == I386_FSBASE_REGNUM)
|
||
{
|
||
register_t base;
|
||
|
||
regcache->raw_collect (I386_FSBASE_REGNUM, &base);
|
||
|
||
if (ptrace (PT_SETFSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
|
||
perror_with_name (_("Couldn't write segment register fs_base"));
|
||
if (regnum != -1)
|
||
return;
|
||
}
|
||
#endif
|
||
#ifdef PT_SETGSBASE
|
||
if (regnum == -1 || regnum == I386_GSBASE_REGNUM)
|
||
{
|
||
register_t base;
|
||
|
||
regcache->raw_collect (I386_GSBASE_REGNUM, &base);
|
||
|
||
if (ptrace (PT_SETGSBASE, pid, (PTRACE_TYPE_ARG3) &base, 0) == -1)
|
||
perror_with_name (_("Couldn't write segment register gs_base"));
|
||
if (regnum != -1)
|
||
return;
|
||
}
|
||
#endif
|
||
|
||
if (regnum == -1 || regnum >= I386_ST0_REGNUM)
|
||
{
|
||
struct fpreg fpregs;
|
||
#ifdef HAVE_PT_GETXMMREGS
|
||
char xmmregs[512];
|
||
#endif
|
||
|
||
#ifdef PT_GETXSTATE_INFO
|
||
if (x86bsd_xsave_len != 0)
|
||
{
|
||
void *xstateregs;
|
||
|
||
xstateregs = alloca (x86bsd_xsave_len);
|
||
if (ptrace (PT_GETXSTATE, pid,
|
||
(PTRACE_TYPE_ARG3) xstateregs, 0) == -1)
|
||
perror_with_name (_("Couldn't get extended state status"));
|
||
|
||
i387_collect_xsave (regcache, -1, xstateregs, 0);
|
||
|
||
if (ptrace (PT_SETXSTATE, pid,
|
||
(PTRACE_TYPE_ARG3) xstateregs, x86bsd_xsave_len) == -1)
|
||
perror_with_name (_("Couldn't write extended state status"));
|
||
return;
|
||
}
|
||
#endif
|
||
|
||
#ifdef HAVE_PT_GETXMMREGS
|
||
if (have_ptrace_xmmregs != 0
|
||
&& ptrace(PT_GETXMMREGS, pid, (PTRACE_TYPE_ARG3) xmmregs, 0) == 0)
|
||
{
|
||
have_ptrace_xmmregs = 1;
|
||
|
||
i387_collect_fxsave (regcache, regnum, xmmregs);
|
||
|
||
if (ptrace (PT_SETXMMREGS, pid, (PTRACE_TYPE_ARG3) xmmregs, 0) == -1)
|
||
perror_with_name (_("Couldn't write XMM registers"));
|
||
}
|
||
else
|
||
{
|
||
have_ptrace_xmmregs = 0;
|
||
#endif
|
||
if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
|
||
perror_with_name (_("Couldn't get floating point status"));
|
||
|
||
i387_collect_fsave (regcache, regnum, &fpregs);
|
||
|
||
if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
|
||
perror_with_name (_("Couldn't write floating point status"));
|
||
#ifdef HAVE_PT_GETXMMREGS
|
||
}
|
||
#endif
|
||
}
|
||
}
|
||
|
||
void
|
||
_initialize_i386bsd_nat (void)
|
||
{
|
||
int offset;
|
||
|
||
/* To support the recognition of signal handlers, i386-bsd-tdep.c
|
||
hardcodes some constants. Inclusion of this file means that we
|
||
are compiling a native debugger, which means that we can use the
|
||
system header files and sysctl(3) to get at the relevant
|
||
information. */
|
||
|
||
#if defined (__FreeBSD_version) && __FreeBSD_version >= 400011
|
||
#define SC_REG_OFFSET i386fbsd4_sc_reg_offset
|
||
#elif defined (__FreeBSD_version) && __FreeBSD_version >= 300005
|
||
#define SC_REG_OFFSET i386fbsd_sc_reg_offset
|
||
#elif defined (NetBSD) || defined (__NetBSD_Version__)
|
||
#define SC_REG_OFFSET i386nbsd_sc_reg_offset
|
||
#elif defined (OpenBSD)
|
||
#define SC_REG_OFFSET i386obsd_sc_reg_offset
|
||
#endif
|
||
|
||
#ifdef SC_REG_OFFSET
|
||
|
||
/* We only check the program counter, stack pointer and frame
|
||
pointer since these members of `struct sigcontext' are essential
|
||
for providing backtraces. More checks could be added, but would
|
||
involve adding configure checks for the appropriate structure
|
||
members, since older BSD's don't provide all of them. */
|
||
|
||
#define SC_PC_OFFSET SC_REG_OFFSET[I386_EIP_REGNUM]
|
||
#define SC_SP_OFFSET SC_REG_OFFSET[I386_ESP_REGNUM]
|
||
#define SC_FP_OFFSET SC_REG_OFFSET[I386_EBP_REGNUM]
|
||
|
||
/* Override the default value for the offset of the program counter
|
||
in the sigcontext structure. */
|
||
offset = offsetof (struct sigcontext, sc_pc);
|
||
|
||
if (SC_PC_OFFSET != offset)
|
||
{
|
||
warning (_("\
|
||
offsetof (struct sigcontext, sc_pc) yields %d instead of %d.\n\
|
||
Please report this to <bug-gdb@gnu.org>."),
|
||
offset, SC_PC_OFFSET);
|
||
}
|
||
|
||
SC_PC_OFFSET = offset;
|
||
|
||
/* Likewise for the stack pointer. */
|
||
offset = offsetof (struct sigcontext, sc_sp);
|
||
|
||
if (SC_SP_OFFSET != offset)
|
||
{
|
||
warning (_("\
|
||
offsetof (struct sigcontext, sc_sp) yields %d instead of %d.\n\
|
||
Please report this to <bug-gdb@gnu.org>."),
|
||
offset, SC_SP_OFFSET);
|
||
}
|
||
|
||
SC_SP_OFFSET = offset;
|
||
|
||
/* And the frame pointer. */
|
||
offset = offsetof (struct sigcontext, sc_fp);
|
||
|
||
if (SC_FP_OFFSET != offset)
|
||
{
|
||
warning (_("\
|
||
offsetof (struct sigcontext, sc_fp) yields %d instead of %d.\n\
|
||
Please report this to <bug-gdb@gnu.org>."),
|
||
offset, SC_FP_OFFSET);
|
||
}
|
||
|
||
SC_FP_OFFSET = offset;
|
||
|
||
#endif /* SC_REG_OFFSET */
|
||
}
|