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/* Intel 386 native support.
Copyright (C) 1988, 1989, 1991, 1992 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "defs.h"
#include "frame.h"
#include "inferior.h"
#include "language.h"
#include "gdbcore.h"
#ifdef USG
#include <sys/types.h>
#endif
#include <sys/param.h>
#include <sys/dir.h>
#include <signal.h>
#include <sys/user.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <stddef.h>
#include <sys/ptrace.h>
/* Does AIX define this in <errno.h>? */
extern int errno;
#ifndef NO_SYS_REG_H
#include <sys/reg.h>
#endif
#include "ieee-float.h"
#include "target.h"
extern struct ext_format ext_format_i387;
/* this table must line up with REGISTER_NAMES in tm-i386v.h */
/* symbols like 'EAX' come from <sys/reg.h> */
static int regmap[] =
{
EAX, ECX, EDX, EBX,
USP, EBP, ESI, EDI,
EIP, EFL, CS, SS,
DS, ES, FS, GS,
};
/* blockend is the value of u.u_ar0, and points to the
* place where GS is stored
*/
int
i386_register_u_addr (blockend, regnum)
int blockend;
int regnum;
{
#if 0
/* this will be needed if fp registers are reinstated */
/* for now, you can look at them with 'info float'
* sys5 wont let you change them with ptrace anyway
*/
if (regnum >= FP0_REGNUM && regnum <= FP7_REGNUM)
{
int ubase, fpstate;
struct user u;
ubase = blockend + 4 * (SS + 1) - KSTKSZ;
fpstate = ubase + ((char *)&u.u_fpstate - (char *)&u);
return (fpstate + 0x1c + 10 * (regnum - FP0_REGNUM));
}
else
#endif
return (blockend + 4 * regmap[regnum]);
}
/* The code below only work on the aix ps/2 (i386-ibm-aix) -
* mtranle@paris - Sat Apr 11 10:34:12 1992
*/
struct env387
{
unsigned short control;
unsigned short r0;
unsigned short status;
unsigned short r1;
unsigned short tag;
unsigned short r2;
unsigned long eip;
unsigned short code_seg;
unsigned short opcode;
unsigned long operand;
unsigned short operand_seg;
unsigned short r3;
unsigned char regs[8][10];
};
static
print_387_status (status, ep)
unsigned short status;
struct env387 *ep;
{
int i;
int bothstatus;
int top;
int fpreg;
unsigned char *p;
bothstatus = ((status != 0) && (ep->status != 0));
if (status != 0)
{
if (bothstatus)
printf_unfiltered ("u: ");
print_387_status_word (status);
}
if (ep->status != 0)
{
if (bothstatus)
printf_unfiltered ("e: ");
print_387_status_word (ep->status);
}
print_387_control_word (ep->control);
printf_unfiltered ("last exception: ");
printf_unfiltered ("opcode %s; ", local_hex_string(ep->opcode));
printf_unfiltered ("pc %s:", local_hex_string(ep->code_seg));
printf_unfiltered ("%s; ", local_hex_string(ep->eip));
printf_unfiltered ("operand %s", local_hex_string(ep->operand_seg));
printf_unfiltered (":%s\n", local_hex_string(ep->operand));
top = 7- ((ep->status >> 11) & 7);
printf_unfiltered ("regno tag msb lsb value\n");
for (fpreg = 7; fpreg >= 0; fpreg--)
{
double val;
printf_unfiltered ("%s %d: ", fpreg == top ? "=>" : " ", fpreg);
switch ((ep->tag >> ((7 - fpreg) * 2)) & 3)
{
case 0: printf_unfiltered ("valid "); break;
case 1: printf_unfiltered ("zero "); break;
case 2: printf_unfiltered ("trap "); break;
case 3: printf_unfiltered ("empty "); break;
}
for (i = 9; i >= 0; i--)
printf_unfiltered ("%02x", ep->regs[fpreg][i]);
i387_to_double ((char *)ep->regs[fpreg], (char *)&val);
printf_unfiltered (" %#g\n", val);
}
}
static struct env387 core_env387;
void
i386_float_info ()
{
struct env387 fps;
int fpsaved = 0;
if (inferior_pid)
{
char buf[10];
unsigned short status;
ptrace (PT_READ_FPR, inferior_pid, buf, offsetof(struct env387, status));
memcpy (&status, buf, sizeof (status));
fpsaved = status;
}
else
{
if ((fpsaved = core_env387.status) != 0)
memcpy(&fps, &core_env387, sizeof(fps));
}
if (fpsaved == 0)
{
printf_unfiltered ("no floating point status saved\n");
return;
}
if (inferior_pid)
{
int offset;
for (offset = 0; offset < sizeof(fps); offset += 10)
{
char buf[10];
ptrace (PT_READ_FPR, inferior_pid, buf, offset);
memcpy ((char *)&fps.control + offset, buf,
MIN(10, sizeof(fps) - offset));
}
}
print_387_status (0, (struct env387 *)&fps);
}
/* Fetch one register. */
static void
fetch_register (regno)
int regno;
{
char buf[MAX_REGISTER_RAW_SIZE];
if (regno < FP0_REGNUM)
*(int *)buf = ptrace (PT_READ_GPR, inferior_pid,
PT_REG(regmap[regno]), 0, 0);
else
ptrace (PT_READ_FPR, inferior_pid, buf,
(regno - FP0_REGNUM)*10 + offsetof(struct env387, regs));
supply_register (regno, buf);
}
void
fetch_inferior_registers (regno)
int regno;
{
if (regno < 0)
for (regno = 0; regno < NUM_REGS; regno++)
fetch_register (regno);
else
fetch_register (regno);
}
/* store one register */
static void
store_register (regno)
int regno;
{
char buf[80];
extern char registers[];
errno = 0;
if (regno < FP0_REGNUM)
ptrace (PT_WRITE_GPR, inferior_pid, PT_REG(regmap[regno]),
*(int *) ®isters[REGISTER_BYTE (regno)], 0);
else
ptrace (PT_WRITE_FPR, inferior_pid, ®isters[REGISTER_BYTE (regno)],
(regno - FP0_REGNUM)*10 + offsetof(struct env387, regs));
if (errno != 0)
{
sprintf (buf, "writing register number %d", regno);
perror_with_name (buf);
}
}
/* Store our register values back into the inferior.
If REGNO is -1, do this for all registers.
Otherwise, REGNO specifies which register (so we can save time). */
void
store_inferior_registers (regno)
int regno;
{
if (regno < 0)
for (regno = 0; regno < NUM_REGS; regno++)
store_register (regno);
else
store_register (regno);
}
#ifndef CD_AX /* defined in sys/i386/coredump.h */
# define CD_AX 0
# define CD_BX 1
# define CD_CX 2
# define CD_DX 3
# define CD_SI 4
# define CD_DI 5
# define CD_BP 6
# define CD_SP 7
# define CD_FL 8
# define CD_IP 9
# define CD_CS 10
# define CD_DS 11
# define CD_ES 12
# define CD_FS 13
# define CD_GS 14
# define CD_SS 15
#endif
/*
* The order here in core_regmap[] has to be the same as in
* regmap[] above.
*/
static int core_regmap[] =
{
CD_AX, CD_CX, CD_DX, CD_BX,
CD_SP, CD_BP, CD_SI, CD_DI,
CD_IP, CD_FL, CD_CS, CD_SS,
CD_DS, CD_ES, CD_FS, CD_GS,
};
void
fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
char *core_reg_sect;
unsigned core_reg_size;
int which;
unsigned int reg_addr; /* ignored */
{
if (which == 0)
{
/* Integer registers */
#define cd_regs(n) ((int *)core_reg_sect)[n]
#define regs(n) *((int *) ®isters[REGISTER_BYTE (n)])
int i;
for (i = 0; i < FP0_REGNUM; i++)
regs(i) = cd_regs(core_regmap[i]);
}
else if (which == 2)
{
/* Floating point registers */
if (core_reg_size >= sizeof (core_env387))
memcpy (&core_env387, core_reg_sect, core_reg_size);
else
fprintf_unfiltered (gdb_stderr, "Couldn't read float regs from core file\n");
}
}
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