4.4BSD/usr/src/contrib/gdb-4.7.lbl/gdb/sun386-nat.c
/* Native support for Sun 386i's for GDB, the GNU debugger.
Copyright (C) 1986, 1987, 1989, 1991, 1992 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
#if defined (GDB_TARGET_IS_SUN386)
#include "defs.h"
#include "frame.h"
#include "inferior.h"
#include "gdbcore.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 <sys/stat.h>
#include <sys/core.h>
/* Machine-dependent code which would otherwise be in core.c */
/* Work with core files, for GDB. */
void
core_file_command (filename, from_tty)
char *filename;
int from_tty;
{
int val;
extern char registers[];
/* Discard all vestiges of any previous core file
and mark data and stack spaces as empty. */
if (corefile)
free (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 (free, filename);
if (have_inferior_p ())
error ("To look at a core file, you must kill the inferior 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;
bcopy (&corestr.c_regs, registers, sizeof corestr.c_regs);
bcopy (corestr.c_fpu.f_fpstatus.f_st,
®isters[REGISTER_BYTE (FP0_REGNUM)],
sizeof corestr.c_fpu.f_fpstatus.f_st);
bcopy (&corestr.c_fpu.f_fpstatus.f_ctrl,
®isters[REGISTER_BYTE (FPC_REGNUM)],
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. */
bcopy (&corestr.c_aouthdr, &core_aouthdr, sizeof (struct exec));
#ifndef COFF_ENCAPSULATE
core_aouthdr.magic = corestr.c_aouthdr.a_info;
core_aouthdr.vstamp = /*SUNVERSION*/ 31252;
#endif
printf ("Core file is from \"%s\".\n", corestr.c_cmdname);
if (corestr.c_signo > 0)
printf ("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);
}
set_current_frame ( create_new_frame (read_register (FP_REGNUM),
read_pc ()));
select_frame (get_current_frame (), 0);
validate_files ();
}
else if (from_tty)
printf ("No core file now.\n");
}
i387_to_double (from, to)
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 (from, to)
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");
}
#else /* Not sun386 target. */
/* These functions shouldn't be called when we're cross-debugging. */
/* ARGSUSED */
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; /* Unused in this version */
{
}
#endif /* Not sun386 target. */
void
fetch_inferior_registers (regno)
int regno;
{
struct regs inferior_registers;
struct fp_state inferior_fp_registers;
extern char registers[];
registers_fetched ();
ptrace (PTRACE_GETREGS, inferior_pid,
(PTRACE_ARG3_TYPE) &inferior_registers);
ptrace (PTRACE_GETFPREGS, inferior_pid,
(PTRACE_ARG3_TYPE) &inferior_fp_registers);
bcopy (&inferior_registers, registers, sizeof inferior_registers);
bcopy (inferior_fp_registers.f_st,®isters[REGISTER_BYTE (FP0_REGNUM)],
sizeof inferior_fp_registers.f_st);
bcopy (&inferior_fp_registers.f_ctrl,
®isters[REGISTER_BYTE (FPC_REGNUM)],
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 (regno)
int regno;
{
struct regs inferior_registers;
struct fp_state inferior_fp_registers;
extern char registers[];
bcopy (registers, &inferior_registers, 20 * 4);
bcopy (®isters[REGISTER_BYTE (FP0_REGNUM)],inferior_fp_registers.f_st,
sizeof inferior_fp_registers.f_st);
bcopy (®isters[REGISTER_BYTE (FPC_REGNUM)],
&inferior_fp_registers.f_ctrl,
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);
}