257 lines
6.8 KiB
C
257 lines
6.8 KiB
C
/* Native-dependent code for SVR4 Unix running on i386's, for GDB.
|
|
Copyright 1988, 1989, 1991, 1992, 1996, 1998 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 "value.h"
|
|
#include "inferior.h"
|
|
|
|
#ifdef HAVE_SYS_REG_H
|
|
#include <sys/reg.h>
|
|
#endif
|
|
|
|
|
|
#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 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.
|
|
|
|
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 register set is typically defined
|
|
by:
|
|
|
|
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 //
|
|
} fpregset_t;
|
|
|
|
These routines provide the packing and unpacking of gregset_t and
|
|
fpregset_t formatted data.
|
|
|
|
*/
|
|
|
|
#ifdef HAVE_GREGSET_T
|
|
|
|
/* This is a duplicate of the table in i386-xdep.c. */
|
|
|
|
static int regmap[] =
|
|
{
|
|
EAX, ECX, EDX, EBX,
|
|
UESP, EBP, ESI, EDI,
|
|
EIP, EFL, CS, SS,
|
|
DS, ES, FS, GS,
|
|
};
|
|
|
|
/* Prototypes for local functions */
|
|
|
|
void fill_gregset (gregset_t *, int);
|
|
|
|
void supply_gregset (gregset_t *);
|
|
|
|
void supply_fpregset (fpregset_t *);
|
|
|
|
void fill_fpregset (fpregset_t *, int);
|
|
|
|
|
|
/* FIXME: These routine absolutely depends upon (NUM_REGS - NUM_FREGS)
|
|
being less than or equal to the number of registers that can be stored
|
|
in a gregset_t. Note that with the current scheme there will typically
|
|
be more registers actually stored in a gregset_t that what we know
|
|
about. This is bogus and should be fixed. */
|
|
|
|
/* Given a pointer to a general register set in /proc format (gregset_t *),
|
|
unpack the register contents and supply them as gdb's idea of the current
|
|
register values. */
|
|
|
|
void
|
|
supply_gregset (gregsetp)
|
|
gregset_t *gregsetp;
|
|
{
|
|
register int regi;
|
|
register greg_t *regp = (greg_t *) gregsetp;
|
|
extern int regmap[];
|
|
|
|
for (regi = 0; regi < (NUM_REGS - NUM_FREGS); regi++)
|
|
{
|
|
supply_register (regi, (char *) (regp + regmap[regi]));
|
|
}
|
|
}
|
|
|
|
void
|
|
fill_gregset (gregsetp, regno)
|
|
gregset_t *gregsetp;
|
|
int regno;
|
|
{
|
|
int regi;
|
|
register greg_t *regp = (greg_t *) gregsetp;
|
|
extern int regmap[];
|
|
|
|
for (regi = 0; regi < (NUM_REGS - NUM_FREGS); regi++)
|
|
{
|
|
if ((regno == -1) || (regno == regi))
|
|
{
|
|
*(regp + regmap[regi]) = *(int *) ®isters[REGISTER_BYTE (regi)];
|
|
}
|
|
}
|
|
}
|
|
|
|
#endif /* HAVE_GREGSET_T */
|
|
|
|
#if defined (HAVE_FPREGSET_T)
|
|
|
|
/* Given a pointer to a floating point register set in /proc format
|
|
(fpregset_t *), unpack the register contents and supply them as gdb's
|
|
idea of the current floating point register values. */
|
|
|
|
/* FIXME: Assumes that fpregsetp contains an i387 FSAVE area. */
|
|
static const int freg_offset_map[] =
|
|
{
|
|
#if !defined(FPREGSET_FSAVE_OFFSET)
|
|
#define FPREGSET_FSAVE_OFFSET 0
|
|
#endif
|
|
FPREGSET_FSAVE_OFFSET + 28 + 0 * 10,
|
|
FPREGSET_FSAVE_OFFSET + 28 + 1 * 10,
|
|
FPREGSET_FSAVE_OFFSET + 28 + 2 * 10,
|
|
FPREGSET_FSAVE_OFFSET + 28 + 3 * 10,
|
|
FPREGSET_FSAVE_OFFSET + 28 + 4 * 10,
|
|
FPREGSET_FSAVE_OFFSET + 28 + 5 * 10,
|
|
FPREGSET_FSAVE_OFFSET + 28 + 6 * 10,
|
|
FPREGSET_FSAVE_OFFSET + 28 + 7 * 10,
|
|
FPREGSET_FSAVE_OFFSET + 0,
|
|
FPREGSET_FSAVE_OFFSET + 4,
|
|
FPREGSET_FSAVE_OFFSET + 8,
|
|
FPREGSET_FSAVE_OFFSET + 16,
|
|
FPREGSET_FSAVE_OFFSET + 12,
|
|
FPREGSET_FSAVE_OFFSET + 24,
|
|
FPREGSET_FSAVE_OFFSET + 20,
|
|
FPREGSET_FSAVE_OFFSET + 16
|
|
};
|
|
|
|
void
|
|
supply_fpregset (fpregsetp)
|
|
fpregset_t *fpregsetp;
|
|
{
|
|
int regi;
|
|
|
|
if (NUM_FREGS == 0)
|
|
return;
|
|
for (regi = FP0_REGNUM; regi <= LAST_FPU_CTRL_REGNUM; regi++)
|
|
{
|
|
char tbuf[4];
|
|
ULONGEST tval;
|
|
char *from = (char *) fpregsetp + freg_offset_map[regi - FP0_REGNUM];
|
|
|
|
if (regi == FCS_REGNUM)
|
|
{
|
|
tval = extract_unsigned_integer (from, 4) & 0xffff;
|
|
store_unsigned_integer (tbuf, 4, tval);
|
|
supply_register (regi, tbuf);
|
|
}
|
|
else if (regi == FOP_REGNUM)
|
|
{
|
|
tval = (extract_unsigned_integer (from, 4) >> 16) & ((1 << 11) - 1);
|
|
store_unsigned_integer (tbuf, 4, tval);
|
|
supply_register (regi, tbuf);
|
|
}
|
|
else
|
|
supply_register (regi, from);
|
|
}
|
|
}
|
|
|
|
/* Given a pointer to a floating point register set in /proc format
|
|
(fpregset_t *), update the register specified by REGNO from gdb's idea
|
|
of the current floating point register set. If REGNO is -1, update
|
|
them all. */
|
|
|
|
void
|
|
fill_fpregset (fpregsetp, regno)
|
|
fpregset_t *fpregsetp;
|
|
int regno;
|
|
{
|
|
int regi;
|
|
|
|
if (NUM_FREGS == 0)
|
|
return;
|
|
for (regi = FP0_REGNUM; regi <= LAST_FPU_CTRL_REGNUM; regi++)
|
|
{
|
|
if ((regno == -1) || (regno == regi))
|
|
{
|
|
char *to = (char *) fpregsetp + freg_offset_map[regi - FP0_REGNUM];
|
|
char *from = (char *) ®isters[REGISTER_BYTE (regi)];
|
|
ULONGEST valto;
|
|
ULONGEST valfrom;
|
|
|
|
if (regi == FCS_REGNUM)
|
|
{
|
|
valto = extract_unsigned_integer (to, 4);
|
|
valfrom = extract_unsigned_integer (from, 4);
|
|
valto = (valto & ~0xffff) | (valfrom & 0xffff);
|
|
store_unsigned_integer (to, 4, valto);
|
|
}
|
|
else if (regi == FOP_REGNUM)
|
|
{
|
|
valto = extract_unsigned_integer (to, 4);
|
|
valfrom = extract_unsigned_integer (from, 4);
|
|
valto = (valto & 0xffff) | ((valfrom & ((1 << 11) - 1)) << 16);
|
|
store_unsigned_integer (to, 4, valto);
|
|
}
|
|
else
|
|
{
|
|
memcpy (to, from, REGISTER_RAW_SIZE (regi));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
#endif /* defined (HAVE_FPREGSET_T) */
|
|
|
|
#endif /* HAVE_SYS_PROCFS_H */
|