172 lines
4.4 KiB
C
172 lines
4.4 KiB
C
/* Intel 386 native support for SYSV systems (pre-SVR4).
|
||
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>
|
||
|
||
#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,
|
||
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
|
||
*/
|
||
|
||
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]);
|
||
|
||
}
|
||
|
||
#if 0
|
||
/* using FLOAT_INFO as is would be a problem. FLOAT_INFO is called
|
||
via a command xxx and eventually calls ptrace without ever having
|
||
traversed the target vector. This would be terribly impolite
|
||
behaviour for a sun4 hosted remote gdb.
|
||
|
||
A fix might be to move this code into the "info registers" command.
|
||
rich@cygnus.com 15 Sept 92. */
|
||
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, (PTRACE_ARG3_TYPE) 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_unfiltered ("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, (PTRACE_ARG3_TYPE) 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 /* never */
|