251 lines
6.2 KiB
C
251 lines
6.2 KiB
C
/* Intel 386 stuff.
|
||
Copyright (C) 1988, 1989, 1991 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 <stdio.h>
|
||
#include "defs.h"
|
||
#include "param.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 <sys/reg.h>
|
||
#include "ieee-float.h"
|
||
|
||
#include "target.h"
|
||
|
||
extern void print_387_control_word (); /* i387-tdep.h */
|
||
extern void print_387_status_word ();
|
||
|
||
extern struct ext_format ext_format_i387;
|
||
|
||
/* this table must line up with REGISTER_NAMES in m-i386.h */
|
||
/* symbols like 'EAX' come from <sys/reg.h> */
|
||
static int regmap[] =
|
||
{
|
||
EAX, ECX, EDX, EBX,
|
||
UESP, 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
|
||
*/
|
||
i386_register_u_addr (blockend, 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]);
|
||
|
||
}
|
||
|
||
#if 0
|
||
/* mauro@olympus 1991.10.20 -- compiling the following code causes
|
||
undefined symbols at link time, specifically: corechan, have_inferior_p */
|
||
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 ("u: ");
|
||
print_387_status_word (status);
|
||
}
|
||
|
||
if (ep->status != 0)
|
||
{
|
||
if (bothstatus)
|
||
printf ("e: ");
|
||
print_387_status_word (ep->status);
|
||
}
|
||
|
||
print_387_control_word (ep->control);
|
||
printf ("last exception: ");
|
||
printf ("opcode %s; ", local_hex_string(ep->opcode));
|
||
printf ("pc %s:", local_hex_string(ep->code_seg));
|
||
printf ("%s; ", local_hex_string(ep->eip));
|
||
printf ("operand %s", local_hex_string(ep->operand_seg));
|
||
printf (":%s\n", local_hex_string(ep->operand));
|
||
|
||
top = (ep->status >> 11) & 7;
|
||
|
||
printf ("regno tag msb lsb value\n");
|
||
for (fpreg = 7; fpreg >= 0; fpreg--)
|
||
{
|
||
double val;
|
||
|
||
printf ("%s %d: ", fpreg == top ? "=>" : " ", fpreg);
|
||
|
||
switch ((ep->tag >> (fpreg * 2)) & 3)
|
||
{
|
||
case 0: printf ("valid "); break;
|
||
case 1: printf ("zero "); break;
|
||
case 2: printf ("trap "); break;
|
||
case 3: printf ("empty "); break;
|
||
}
|
||
for (i = 9; i >= 0; i--)
|
||
printf ("%02x", ep->regs[fpreg][i]);
|
||
|
||
ieee_extended_to_double (&ext_format_i387, (char *)ep->regs[fpreg],
|
||
&val);
|
||
printf (" %g\n", val);
|
||
}
|
||
if (ep->r0)
|
||
printf ("warning: reserved0 is %s\n", local_hex_string(ep->r0));
|
||
if (ep->r1)
|
||
printf ("warning: reserved1 is %s\n", local_hex_string(ep->r1));
|
||
if (ep->r2)
|
||
printf ("warning: reserved2 is %s\n", local_hex_string(ep->r2));
|
||
if (ep->r3)
|
||
printf ("warning: reserved3 is %s\n", local_hex_string(ep->r3));
|
||
}
|
||
|
||
#ifndef U_FPSTATE
|
||
#define U_FPSTATE(u) u.u_fpstate
|
||
#endif
|
||
|
||
i386_float_info ()
|
||
{
|
||
struct user u; /* just for address computations */
|
||
int i;
|
||
/* fpstate defined in <sys/user.h> */
|
||
struct fpstate *fpstatep;
|
||
char buf[sizeof (struct fpstate) + 2 * sizeof (int)];
|
||
unsigned int uaddr;
|
||
char fpvalid = 0;
|
||
unsigned int rounded_addr;
|
||
unsigned int rounded_size;
|
||
extern int corechan;
|
||
int skip;
|
||
|
||
uaddr = (char *)&u.u_fpvalid - (char *)&u;
|
||
if (target_has_execution)
|
||
{
|
||
unsigned int data;
|
||
unsigned int mask;
|
||
|
||
rounded_addr = uaddr & -sizeof (int);
|
||
data = ptrace (3, inferior_pid, rounded_addr, 0);
|
||
mask = 0xff << ((uaddr - rounded_addr) * 8);
|
||
|
||
fpvalid = ((data & mask) != 0);
|
||
}
|
||
#if 0
|
||
else
|
||
{
|
||
if (lseek (corechan, uaddr, 0) < 0)
|
||
perror ("seek on core file");
|
||
if (myread (corechan, &fpvalid, 1) < 0)
|
||
perror ("read on core file");
|
||
|
||
}
|
||
#endif /* no core support yet */
|
||
|
||
if (fpvalid == 0)
|
||
{
|
||
printf ("no floating point status saved\n");
|
||
return;
|
||
}
|
||
|
||
uaddr = (char *)&U_FPSTATE(u) - (char *)&u;
|
||
if (target_has_execution)
|
||
{
|
||
int *ip;
|
||
|
||
rounded_addr = uaddr & -sizeof (int);
|
||
rounded_size = (((uaddr + sizeof (struct fpstate)) - uaddr) +
|
||
sizeof (int) - 1) / sizeof (int);
|
||
skip = uaddr - rounded_addr;
|
||
|
||
ip = (int *)buf;
|
||
for (i = 0; i < rounded_size; i++)
|
||
{
|
||
*ip++ = ptrace (3, inferior_pid, rounded_addr, 0);
|
||
rounded_addr += sizeof (int);
|
||
}
|
||
}
|
||
#if 0
|
||
else
|
||
{
|
||
if (lseek (corechan, uaddr, 0) < 0)
|
||
perror_with_name ("seek on core file");
|
||
if (myread (corechan, buf, sizeof (struct fpstate)) < 0)
|
||
perror_with_name ("read from core file");
|
||
skip = 0;
|
||
}
|
||
#endif /* 0 */
|
||
|
||
fpstatep = (struct fpstate *)(buf + skip);
|
||
print_387_status (fpstatep->status, (struct env387 *)fpstatep->state);
|
||
}
|
||
#endif /* mauro@olympus 1991.10.20 */
|