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/* 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 (current_regcache, -1, fpregsetp);
}
/* 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);
}
/* Provide a prototype to silence -Wmissing-prototypes. */
void _initialize_amd64fbsd_nat (void);
void
_initialize_amd64fbsd_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];
long 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;
}
}
}
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