binutils-gdb/gdb/i386bsd-nat.c

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/* Native-dependent code for modern i386 BSD's.
Copyright 2000, 2001 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 <sys/types.h>
#include <sys/ptrace.h>
#include <machine/reg.h>
#include <machine/frame.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"
/* 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. */
/* Registers we shouldn't try to fetch. */
#if !defined (CANNOT_FETCH_REGISTER)
#define CANNOT_FETCH_REGISTER(regno) cannot_fetch_register (regno)
#endif
/* Registers we shouldn't try to store. */
#if !defined (CANNOT_STORE_REGISTER)
#define CANNOT_STORE_REGISTER(regno) cannot_fetch_register (regno)
#endif
/* Offset to the gregset_t location where REG is stored. */
#define REG_OFFSET(reg) offsetof (gregset_t, reg)
/* At reg_offset[REGNO] you'll find the offset to the gregset_t
location where the GDB register REGNO is stored. Unsupported
registers are marked with `-1'. */
static int reg_offset[] =
{
REG_OFFSET (r_eax),
REG_OFFSET (r_ecx),
REG_OFFSET (r_edx),
REG_OFFSET (r_edx),
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
};
#define REG_ADDR(regset, regno) ((char *) (regset) + reg_offset[regno])
/* Return nonzero if we shouldn't try to fetch register REGNO. */
static int
cannot_fetch_register (int regno)
{
return (reg_offset[regno] == -1);
}
/* 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)
{
int i;
for (i = 0; i < NUM_GREGS; i++)
{
if (CANNOT_FETCH_REGISTER (i))
supply_register (i, NULL);
else
supply_register (i, REG_ADDR (gregsetp, i));
}
}
/* Fill register REGNO (if it is a general-purpose register) in
*GREGSETPS with the value in GDB's register array. If REGNO is -1,
do this for all registers. */
void
fill_gregset (gregset_t *gregsetp, int regno)
{
int i;
for (i = 0; i < NUM_GREGS; i++)
if ((regno == -1 || regno == i) && ! CANNOT_STORE_REGISTER (i))
memcpy (REG_ADDR (gregsetp, i), &registers[REGISTER_BYTE (i)],
REGISTER_RAW_SIZE (i));
}
#include "i387-nat.h"
/* Fill GDB's register array with the floating-point register values
in *FPREGSETP. */
void
supply_fpregset (fpregset_t *fpregsetp)
{
i387_supply_fsave ((char *) fpregsetp);
}
/* Fill register REGNO (if it is a floating-point register) in
*FPREGSETP with the value in GDB's register array. If REGNO is -1,
do this for all registers. */
void
fill_fpregset (fpregset_t *fpregsetp, int regno)
{
i387_fill_fsave ((char *) fpregsetp, regno);
}
/* Fetch register REGNO from the inferior. If REGNO is -1, do this
for all registers (including the floating point registers). */
void
fetch_inferior_registers (int regno)
{
gregset_t gregs;
if (ptrace (PT_GETREGS, inferior_pid, (PTRACE_ARG3_TYPE) &gregs, 0) == -1)
perror_with_name ("Couldn't get registers");
supply_gregset (&gregs);
if (regno == -1 || regno >= FP0_REGNUM)
{
fpregset_t fpregs;
if (ptrace (PT_GETFPREGS, inferior_pid,
(PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
perror_with_name ("Couldn't get floating point status");
supply_fpregset (&fpregs);
}
}
/* Store register REGNO back into the inferior. If REGNO is -1, do
this for all registers (including the floating point registers). */
void
store_inferior_registers (int regno)
{
gregset_t gregs;
if (ptrace (PT_GETREGS, inferior_pid, (PTRACE_ARG3_TYPE) &gregs, 0) == -1)
perror_with_name ("Couldn't get registers");
fill_gregset (&gregs, regno);
if (ptrace (PT_SETREGS, inferior_pid, (PTRACE_ARG3_TYPE) &gregs, 0) == -1)
perror_with_name ("Couldn't write registers");
if (regno == -1 || regno >= FP0_REGNUM)
{
fpregset_t fpregs;
if (ptrace (PT_GETFPREGS, inferior_pid,
(PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
perror_with_name ("Couldn't get floating point status");
fill_fpregset (&fpregs, regno);
if (ptrace (PT_SETFPREGS, inferior_pid,
(PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
perror_with_name ("Couldn't write floating point status");
}
}
/* Support for the user struct. */
/* Return the address register REGNO. BLOCKEND is the value of
u.u_ar0, which should point to the registers. */
CORE_ADDR
register_u_addr (CORE_ADDR blockend, int regno)
{
return (CORE_ADDR) REG_ADDR (blockend, regno);
}
#include <sys/param.h>
#include <sys/user.h>
/* Return the size of the user struct. */
int
kernel_u_size (void)
{
return (sizeof (struct user));
}