250 lines
7.6 KiB
C
250 lines
7.6 KiB
C
/* Native support for Sun 386i's for GDB, the GNU debugger.
|
||
Copyright 1986, 1987, 1989, 1991, 1992, 1993, 1995, 1999, 2000, 2001
|
||
Free Software Foundation, Inc.
|
||
Changes for sun386i by Jean Daniel Fekete (jdf@litp.univ-p6-7.fr),
|
||
C2V Paris, April 89.
|
||
|
||
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 "frame.h"
|
||
#include "inferior.h"
|
||
#include "gdbcore.h"
|
||
#include "regcache.h"
|
||
|
||
#include <sys/param.h>
|
||
#include <sys/dir.h>
|
||
#include <sys/user.h>
|
||
#include <signal.h>
|
||
#include <sys/ioctl.h>
|
||
#include <fcntl.h>
|
||
|
||
#include <sys/ptrace.h>
|
||
#include <machine/reg.h>
|
||
|
||
#include <sys/file.h>
|
||
#include "gdb_stat.h"
|
||
#include <sys/core.h>
|
||
|
||
|
||
/* Machine-dependent code which would otherwise be in corefile.c */
|
||
/* Work with core files, for GDB. */
|
||
|
||
|
||
void
|
||
core_file_command (char *filename, int from_tty)
|
||
{
|
||
int val;
|
||
|
||
/* Discard all vestiges of any previous core file
|
||
and mark data and stack spaces as empty. */
|
||
|
||
if (corefile)
|
||
xfree (corefile);
|
||
corefile = 0;
|
||
|
||
if (corechan >= 0)
|
||
close (corechan);
|
||
corechan = -1;
|
||
|
||
data_start = 0;
|
||
data_end = 0;
|
||
stack_start = STACK_END_ADDR;
|
||
stack_end = STACK_END_ADDR;
|
||
|
||
/* Now, if a new core file was specified, open it and digest it. */
|
||
|
||
if (filename)
|
||
{
|
||
filename = tilde_expand (filename);
|
||
make_cleanup (xfree, filename);
|
||
|
||
if (have_inferior_p ())
|
||
error ("To look at a core file, you must kill the program with \"kill\".");
|
||
corechan = open (filename, O_RDONLY, 0);
|
||
if (corechan < 0)
|
||
perror_with_name (filename);
|
||
|
||
{
|
||
struct core corestr;
|
||
|
||
val = myread (corechan, &corestr, sizeof corestr);
|
||
if (val < 0)
|
||
perror_with_name (filename);
|
||
if (corestr.c_magic != CORE_MAGIC)
|
||
error ("\"%s\" does not appear to be a core dump file (magic 0x%x, expected 0x%x)",
|
||
filename, corestr.c_magic, (int) CORE_MAGIC);
|
||
else if (sizeof (struct core) != corestr.c_len)
|
||
error ("\"%s\" has an invalid struct core length (%d, expected %d)",
|
||
filename, corestr.c_len, (int) sizeof (struct core));
|
||
|
||
data_start = exec_data_start;
|
||
data_end = data_start + corestr.c_dsize;
|
||
stack_start = stack_end - corestr.c_ssize;
|
||
data_offset = sizeof corestr;
|
||
stack_offset = sizeof corestr + corestr.c_dsize;
|
||
|
||
memcpy (registers, &corestr.c_regs, sizeof corestr.c_regs);
|
||
|
||
memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)],
|
||
corestr.c_fpu.f_fpstatus.f_st,
|
||
sizeof corestr.c_fpu.f_fpstatus.f_st);
|
||
memcpy (®isters[REGISTER_BYTE (FPC_REGNUM)],
|
||
&corestr.c_fpu.f_fpstatus.f_ctrl,
|
||
sizeof corestr.c_fpu.f_fpstatus -
|
||
sizeof corestr.c_fpu.f_fpstatus.f_st);
|
||
|
||
/* the struct aouthdr of sun coff is not the struct exec stored
|
||
in the core file. */
|
||
memcpy (&core_aouthdr, &corestr.c_aouthdr, sizeof (struct exec));
|
||
#ifndef COFF_ENCAPSULATE
|
||
core_aouthdr.magic = corestr.c_aouthdr.a_info;
|
||
core_aouthdr.vstamp = /*SUNVERSION */ 31252;
|
||
#endif
|
||
printf_unfiltered ("Core file is from \"%s\".\n", corestr.c_cmdname);
|
||
if (corestr.c_signo > 0)
|
||
printf_unfiltered ("Program terminated with signal %d, %s.\n",
|
||
corestr.c_signo, safe_strsignal (corestr.c_signo));
|
||
}
|
||
if (filename[0] == '/')
|
||
corefile = savestring (filename, strlen (filename));
|
||
else
|
||
{
|
||
corefile = concat (current_directory, "/", filename, NULL);
|
||
}
|
||
|
||
flush_cached_frames ();
|
||
select_frame (get_current_frame (), 0);
|
||
|
||
validate_files ();
|
||
}
|
||
else if (from_tty)
|
||
printf_unfiltered ("No core file now.\n");
|
||
}
|
||
|
||
i387_to_double (char *from, char *to)
|
||
{
|
||
long *lp;
|
||
/* push extended mode on 387 stack, then pop in double mode
|
||
|
||
* first, set exception masks so no error is generated -
|
||
* number will be rounded to inf or 0, if necessary
|
||
*/
|
||
asm ("pushl %eax"); /* grab a stack slot */
|
||
asm ("fstcw (%esp)"); /* get 387 control word */
|
||
asm ("movl (%esp),%eax"); /* save old value */
|
||
asm ("orl $0x3f,%eax"); /* mask all exceptions */
|
||
asm ("pushl %eax");
|
||
asm ("fldcw (%esp)"); /* load new value into 387 */
|
||
|
||
asm ("movl 8(%ebp),%eax");
|
||
asm ("fldt (%eax)"); /* push extended number on 387 stack */
|
||
asm ("fwait");
|
||
asm ("movl 12(%ebp),%eax");
|
||
asm ("fstpl (%eax)"); /* pop double */
|
||
asm ("fwait");
|
||
|
||
asm ("popl %eax"); /* flush modified control word */
|
||
asm ("fnclex"); /* clear exceptions */
|
||
asm ("fldcw (%esp)"); /* restore original control word */
|
||
asm ("popl %eax"); /* flush saved copy */
|
||
}
|
||
|
||
double_to_i387 (char *from, char *to)
|
||
{
|
||
/* push double mode on 387 stack, then pop in extended mode
|
||
* no errors are possible because every 64-bit pattern
|
||
* can be converted to an extended
|
||
*/
|
||
asm ("movl 8(%ebp),%eax");
|
||
asm ("fldl (%eax)");
|
||
asm ("fwait");
|
||
asm ("movl 12(%ebp),%eax");
|
||
asm ("fstpt (%eax)");
|
||
asm ("fwait");
|
||
}
|
||
|
||
void
|
||
fetch_inferior_registers (int regno)
|
||
{
|
||
struct regs inferior_registers;
|
||
struct fp_state inferior_fp_registers;
|
||
|
||
registers_fetched ();
|
||
|
||
ptrace (PTRACE_GETREGS, inferior_pid,
|
||
(PTRACE_ARG3_TYPE) & inferior_registers);
|
||
ptrace (PTRACE_GETFPREGS, inferior_pid,
|
||
(PTRACE_ARG3_TYPE) & inferior_fp_registers);
|
||
|
||
memcpy (registers, &inferior_registers, sizeof inferior_registers);
|
||
|
||
memcpy (®isters[REGISTER_BYTE (FP0_REGNUM)], inferior_fp_registers.f_st,
|
||
sizeof inferior_fp_registers.f_st);
|
||
memcpy (®isters[REGISTER_BYTE (FPC_REGNUM)],
|
||
&inferior_fp_registers.f_ctrl,
|
||
sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
|
||
}
|
||
|
||
/* 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 (int regno)
|
||
{
|
||
struct regs inferior_registers;
|
||
struct fp_state inferior_fp_registers;
|
||
|
||
memcpy (&inferior_registers, registers, 20 * 4);
|
||
|
||
memcpy (inferior_fp_registers.f_st,
|
||
®isters[REGISTER_BYTE (FP0_REGNUM)],
|
||
sizeof inferior_fp_registers.f_st);
|
||
memcpy (&inferior_fp_registers.f_ctrl,
|
||
®isters[REGISTER_BYTE (FPC_REGNUM)],
|
||
sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
|
||
|
||
#ifdef PTRACE_FP_BUG
|
||
if (regno == FP_REGNUM || regno == -1)
|
||
/* Storing the frame pointer requires a gross hack, in which an
|
||
instruction that moves eax into ebp gets single-stepped. */
|
||
{
|
||
int stack = inferior_registers.r_reg[SP_REGNUM];
|
||
int stuff = ptrace (PTRACE_PEEKDATA, inferior_pid,
|
||
(PTRACE_ARG3_TYPE) stack);
|
||
int reg = inferior_registers.r_reg[EAX];
|
||
inferior_registers.r_reg[EAX] =
|
||
inferior_registers.r_reg[FP_REGNUM];
|
||
ptrace (PTRACE_SETREGS, inferior_pid,
|
||
(PTRACE_ARG3_TYPE) & inferior_registers);
|
||
ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack,
|
||
0xc589);
|
||
ptrace (PTRACE_SINGLESTEP, inferior_pid, (PTRACE_ARG3_TYPE) stack,
|
||
0);
|
||
wait (0);
|
||
ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack,
|
||
stuff);
|
||
inferior_registers.r_reg[EAX] = reg;
|
||
}
|
||
#endif
|
||
ptrace (PTRACE_SETREGS, inferior_pid,
|
||
(PTRACE_ARG3_TYPE) & inferior_registers);
|
||
ptrace (PTRACE_SETFPREGS, inferior_pid,
|
||
(PTRACE_ARG3_TYPE) & inferior_fp_registers);
|
||
}
|