305 lines
8.2 KiB
C
305 lines
8.2 KiB
C
/* Native-dependent code for FreeBSD/amd64.
|
||
|
||
Copyright 2003 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 2 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, write to the Free Software
|
||
Foundation, Inc., 59 Temple Place - Suite 330,
|
||
Boston, MA 02111-1307, USA. */
|
||
|
||
#include "defs.h"
|
||
#include "inferior.h"
|
||
#include "regcache.h"
|
||
|
||
#include "gdb_assert.h"
|
||
#include <signal.h>
|
||
#include <stddef.h>
|
||
#include <sys/types.h>
|
||
#include <sys/ptrace.h>
|
||
#include <sys/sysctl.h>
|
||
#include <machine/reg.h>
|
||
|
||
#ifdef HAVE_SYS_PROCFS_H
|
||
#include <sys/procfs.h>
|
||
#endif
|
||
|
||
#ifndef HAVE_GREGSET_T
|
||
typedef struct reg gregset_t;
|
||
#endif
|
||
|
||
#ifndef HAVE_FPREGSET_T
|
||
typedef struct fpreg fpregset_t;
|
||
#endif
|
||
|
||
#include "gregset.h"
|
||
#include "x86-64-tdep.h"
|
||
#include "amd64-nat.h"
|
||
|
||
|
||
/* Offset to the gregset_t location where REG is stored. */
|
||
#define REG_OFFSET(reg) offsetof (gregset_t, reg)
|
||
|
||
/* At reg_offset[REGNUM] you'll find the offset to the gregset_t
|
||
location where the GDB register REGNUM is stored. Unsupported
|
||
registers are marked with `-1'. */
|
||
static int reg_offset[] =
|
||
{
|
||
REG_OFFSET (r_rax),
|
||
REG_OFFSET (r_rbx),
|
||
REG_OFFSET (r_rcx),
|
||
REG_OFFSET (r_rdx),
|
||
REG_OFFSET (r_rsi),
|
||
REG_OFFSET (r_rdi),
|
||
REG_OFFSET (r_rbp),
|
||
REG_OFFSET (r_rsp),
|
||
REG_OFFSET (r_r8),
|
||
REG_OFFSET (r_r9),
|
||
REG_OFFSET (r_r10),
|
||
REG_OFFSET (r_r11),
|
||
REG_OFFSET (r_r12),
|
||
REG_OFFSET (r_r13),
|
||
REG_OFFSET (r_r14),
|
||
REG_OFFSET (r_r15),
|
||
REG_OFFSET (r_rip),
|
||
REG_OFFSET (r_rflags),
|
||
-1,
|
||
-1,
|
||
-1,
|
||
-1
|
||
};
|
||
|
||
|
||
/* Mapping between the general-purpose registers in FreeBSD/amd64
|
||
`struct reg' format and GDB's register cache layout for
|
||
FreeBSD/i386.
|
||
|
||
Note that most FreeBSD/amd64 registers are 64-bit, while the
|
||
FreeBSD/i386 registers are all 32-bit, but since we're
|
||
little-endian we get away with that. */
|
||
|
||
/* From <machine/reg.h>. */
|
||
static int amd64fbsd32_r_reg_offset[I386_NUM_GREGS] =
|
||
{
|
||
14 * 8, 13 * 8, /* %eax, %ecx */
|
||
12 * 8, 11 * 8, /* %edx, %ebx */
|
||
20 * 8, 10 * 8, /* %esp, %ebp */
|
||
9 * 8, 8 * 8, /* %esi, %edi */
|
||
17 * 8, 19 * 8, /* %eip, %eflags */
|
||
18 * 8, 21 * 8, /* %cs, %ss */
|
||
-1, -1, -1, -1 /* %ds, %es, %fs, %gs */
|
||
};
|
||
|
||
|
||
/* Transfering the registers between GDB, inferiors and core files. */
|
||
|
||
/* Fill GDB's register array with the general-purpose register values
|
||
in *GREGSETP. */
|
||
|
||
void
|
||
supply_gregset (gregset_t *gregsetp)
|
||
{
|
||
amd64_supply_native_gregset (current_regcache, gregsetp, -1);
|
||
}
|
||
|
||
/* Fill register REGNUM (if it is a general-purpose register) in
|
||
*GREGSETPS with the value in GDB's register array. If REGNUM is -1,
|
||
do this for all registers. */
|
||
|
||
void
|
||
fill_gregset (gregset_t *gregsetp, int regnum)
|
||
{
|
||
amd64_collect_native_gregset (current_regcache, gregsetp, regnum);
|
||
}
|
||
|
||
/* Fill GDB's register array with the floating-point register values
|
||
in *FPREGSETP. */
|
||
|
||
void
|
||
supply_fpregset (fpregset_t *fpregsetp)
|
||
{
|
||
x86_64_supply_fxsave ((const char *) fpregsetp, -1);
|
||
}
|
||
|
||
/* Fill register REGNUM (if it is a floating-point register) in
|
||
*FPREGSETP with the value in GDB's register array. If REGNUM is -1,
|
||
do this for all registers. */
|
||
|
||
void
|
||
fill_fpregset (fpregset_t *fpregsetp, int regnum)
|
||
{
|
||
x86_64_fill_fxsave ((char *) fpregsetp, regnum);
|
||
}
|
||
|
||
/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
|
||
for all registers (including the floating point registers). */
|
||
|
||
void
|
||
fetch_inferior_registers (int regnum)
|
||
{
|
||
if (regnum == -1 || amd64_native_gregset_supplies_p (regnum))
|
||
{
|
||
struct reg regs;
|
||
|
||
if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
|
||
(PTRACE_ARG3_TYPE) ®s, 0) == -1)
|
||
perror_with_name ("Couldn't get registers");
|
||
|
||
amd64_supply_native_gregset (current_regcache, ®s, -1);
|
||
if (regnum != -1)
|
||
return;
|
||
}
|
||
|
||
if (regnum == -1 || regnum >= FP0_REGNUM)
|
||
{
|
||
struct fpreg fpregs;
|
||
|
||
if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
|
||
(PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
|
||
perror_with_name ("Couldn't get floating point status");
|
||
|
||
x86_64_supply_fxsave ((const char *) &fpregs, -1);
|
||
}
|
||
}
|
||
|
||
/* Store register REGNUM back into the inferior. If REGNUM is -1, do
|
||
this for all registers (including the floating point registers). */
|
||
|
||
void
|
||
store_inferior_registers (int regnum)
|
||
{
|
||
if (regnum == -1 || amd64_native_gregset_supplies_p (regnum))
|
||
{
|
||
struct reg regs;
|
||
|
||
if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
|
||
(PTRACE_ARG3_TYPE) ®s, 0) == -1)
|
||
perror_with_name ("Couldn't get registers");
|
||
|
||
amd64_collect_native_gregset (current_regcache, ®s, regnum);
|
||
|
||
if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
|
||
(PTRACE_ARG3_TYPE) ®s, 0) == -1)
|
||
perror_with_name ("Couldn't write registers");
|
||
|
||
if (regnum != -1)
|
||
return;
|
||
}
|
||
|
||
if (regnum == -1 || regnum >= FP0_REGNUM)
|
||
{
|
||
struct fpreg fpregs;
|
||
|
||
if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
|
||
(PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
|
||
perror_with_name ("Couldn't get floating point status");
|
||
|
||
x86_64_fill_fxsave ((char *) &fpregs, regnum);
|
||
|
||
if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
|
||
(PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
|
||
perror_with_name ("Couldn't write floating point status");
|
||
}
|
||
}
|
||
|
||
|
||
/* Provide a prototype to silence -Wmissing-prototypes. */
|
||
void _initialize_amd64fbsd_nat (void);
|
||
|
||
void
|
||
_initialize_am64fbsd_nat (void)
|
||
{
|
||
int offset;
|
||
|
||
amd64_native_gregset32_reg_offset = amd64fbsd32_r_reg_offset;
|
||
amd64_native_gregset64_reg_offset = reg_offset;
|
||
|
||
/* To support the recognition of signal handlers, i386bsd-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. */
|
||
|
||
#define SC_REG_OFFSET amd64fbsd_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. */
|
||
|
||
#define SC_RIP_OFFSET SC_REG_OFFSET[X86_64_RIP_REGNUM]
|
||
#define SC_RSP_OFFSET SC_REG_OFFSET[X86_64_RSP_REGNUM]
|
||
#define SC_RBP_OFFSET SC_REG_OFFSET[X86_64_RBP_REGNUM]
|
||
|
||
/* Override the default value for the offset of the program counter
|
||
in the sigcontext structure. */
|
||
offset = offsetof (struct sigcontext, sc_rip);
|
||
|
||
if (SC_RIP_OFFSET != offset)
|
||
{
|
||
warning ("\
|
||
offsetof (struct sigcontext, sc_rip) yields %d instead of %d.\n\
|
||
Please report this to <bug-gdb@gnu.org>.",
|
||
offset, SC_RIP_OFFSET);
|
||
}
|
||
|
||
SC_RIP_OFFSET = offset;
|
||
|
||
/* Likewise for the stack pointer. */
|
||
offset = offsetof (struct sigcontext, sc_rsp);
|
||
|
||
if (SC_RSP_OFFSET != offset)
|
||
{
|
||
warning ("\
|
||
offsetof (struct sigcontext, sc_rsp) yields %d instead of %d.\n\
|
||
Please report this to <bug-gdb@gnu.org>.",
|
||
offset, SC_RSP_OFFSET);
|
||
}
|
||
|
||
SC_RSP_OFFSET = offset;
|
||
|
||
/* And the frame pointer. */
|
||
offset = offsetof (struct sigcontext, sc_rbp);
|
||
|
||
if (SC_RBP_OFFSET != offset)
|
||
{
|
||
warning ("\
|
||
offsetof (struct sigcontext, sc_rbp) yields %d instead of %d.\n\
|
||
Please report this to <bug-gdb@gnu.org>.",
|
||
offset, SC_RBP_OFFSET);
|
||
}
|
||
|
||
SC_RBP_OFFSET = offset;
|
||
|
||
/* FreeBSD provides a kern.ps_strings sysctl that we can use to
|
||
locate the sigtramp. That way we can still recognize a sigtramp
|
||
if its location is changed in a new kernel. Of course this is
|
||
still based on the assumption that the sigtramp is placed
|
||
directly under the location where the program arguments and
|
||
environment can be found. */
|
||
{
|
||
int mib[2];
|
||
int ps_strings;
|
||
size_t len;
|
||
|
||
mib[0] = CTL_KERN;
|
||
mib[1] = KERN_PS_STRINGS;
|
||
len = sizeof (ps_strings);
|
||
if (sysctl (mib, 2, &ps_strings, &len, NULL, 0) == 0)
|
||
{
|
||
amd64fbsd_sigtramp_start = ps_strings - 32;
|
||
amd64fbsd_sigtramp_end = ps_strings;
|
||
}
|
||
}
|
||
}
|