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/* 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"
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;
unsigned int rounded_addr;
unsigned int rounded_size;
extern int corechan;
int skip;
uaddr = (char *)&u.u_fpvalid - (char *)&u;
if (have_inferior_p())
{
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);
}
else
{
if (lseek (corechan, uaddr, 0) < 0)
perror ("seek on core file");
if (myread (corechan, &fpvalid, 1) < 0)
perror ("read on core file");
}
if (fpvalid == 0)
{
printf ("no floating point status saved\n");
return;
}
uaddr = (char *)&U_FPSTATE(u) - (char *)&u;
if (have_inferior_p ())
{
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);
}
}
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;
}
fpstatep = (struct fpstate *)(buf + skip);
print_387_status (fpstatep->status, (struct env387 *)fpstatep->state);
}
#endif /* mauro@olympus 1991.10.20 */
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