binutils-gdb/gdb/i386v4-nat.c

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/* Native-dependent code for Unix SVR4 running on i386's.
Copyright 1988, 1989, 1991, 1992, 1996, 1997, 1998, 1999, 2000,
2001, 2002, 2004
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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
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.
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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.
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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 "value.h"
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#include "inferior.h"
#include "regcache.h"
#ifdef HAVE_SYS_REG_H
#include <sys/reg.h>
#endif
#include "i386-tdep.h"
#include "i387-tdep.h"
#ifdef HAVE_SYS_PROCFS_H
#include <sys/procfs.h>
/* Prototypes for supply_gregset etc. */
#include "gregset.h"
/* The `/proc' interface divides the target machine's register set up
into two different sets, the general purpose register set (gregset)
and the floating-point register set (fpregset). For each set,
there is an ioctl to get the current register set and another ioctl
to set the current values.
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The actual structure passed through the ioctl interface is, of
course, naturally machine dependent, and is different for each set
of registers. For the i386 for example, the general-purpose
register set is typically defined by:
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typedef int gregset_t[19]; (in <sys/regset.h>)
#define GS 0 (in <sys/reg.h>)
#define FS 1
...
#define UESP 17
#define SS 18
and the floating-point set by:
typedef struct fpregset {
union {
struct fpchip_state // fp extension state //
{
int state[27]; // 287/387 saved state //
int status; // status word saved at //
// exception //
} fpchip_state;
struct fp_emul_space // for emulators //
{
char fp_emul[246];
char fp_epad[2];
} fp_emul_space;
int f_fpregs[62]; // union of the above //
} fp_reg_set;
long f_wregs[33]; // saved weitek state //
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} fpregset_t;
Incidentally fpchip_state contains the FPU state in the same format
as used by the "fsave" instruction, and that's the only thing we
support here. I don't know how the emulator stores it state. The
Weitek stuff definitely isn't supported.
The routines defined here, provide the packing and unpacking of
gregset_t and fpregset_t formatted data. */
#ifdef HAVE_GREGSET_T
/* Mapping between the general-purpose registers in `/proc'
format and GDB's register array layout. */
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static int regmap[] =
{
EAX, ECX, EDX, EBX,
UESP, EBP, ESI, EDI,
EIP, EFL, CS, SS,
DS, ES, FS, GS
};
/* Fill GDB's register array with the general-purpose register values
in *GREGSETP. */
void
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supply_gregset (gregset_t *gregsetp)
{
greg_t *regp = (greg_t *) gregsetp;
int regnum;
for (regnum = 0; regnum < I386_NUM_GREGS; regnum++)
regcache_raw_supply (current_regcache, regnum, regp + regmap[regnum]);
}
/* 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)
{
greg_t *regp = (greg_t *) gregsetp;
int i;
for (i = 0; i < I386_NUM_GREGS; i++)
if (regnum == -1 || regnum == i)
regcache_raw_collect (current_regcache, i, regp + regmap[i]);
}
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#endif /* HAVE_GREGSET_T */
#ifdef HAVE_FPREGSET_T
/* Fill GDB's register array with the floating-point register values in
*FPREGSETP. */
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void
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supply_fpregset (fpregset_t *fpregsetp)
{
if (FP0_REGNUM == 0)
return;
i387_supply_fsave (current_regcache, -1, 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
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fill_fpregset (fpregset_t *fpregsetp, int regno)
{
if (FP0_REGNUM == 0)
return;
i387_fill_fsave ((char *) fpregsetp, regno);
}
#endif /* HAVE_FPREGSET_T */
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#endif /* HAVE_SYS_PROCFS_H */