binutils-gdb/gdb/sun386-nat.c

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/* 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 program with \"kill\".");
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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;
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memcpy (registers, &corestr.c_regs, sizeof corestr.c_regs);
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memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)],
corestr.c_fpu.f_fpstatus.f_st,
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sizeof corestr.c_fpu.f_fpstatus.f_st);
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memcpy (&registers[REGISTER_BYTE (FPC_REGNUM)],
&corestr.c_fpu.f_fpstatus.f_ctrl,
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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. */
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memcpy (&core_aouthdr, &corestr.c_aouthdr, sizeof (struct exec));
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#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);
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if (corestr.c_signo > 0)
printf_unfiltered ("Program terminated with signal %d, %s.\n",
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corestr.c_signo, safe_strsignal (corestr.c_signo));
}
if (filename[0] == '/')
corefile = savestring (filename, strlen (filename));
else
{
corefile = concat (current_directory, "/", filename, NULL);
}
The point of these changes is to avoid reading the frame pointer and stack pointer during stepping, to speed things up. A. Changes to not select a frame until we need a selected frame: * blockframe.c (flush_cached_frames): Call select_frame (NULL, -1). * infrun.c (wait_for_inferior): Move call to select_frame back to normal_stop. This reverts a change of 13 Apr 94 (it says Jeff Law, but the change was my idea); the only reason for that change was so we could save and restore the selected frame in wait_for_inferior, and now that flush_cached frames clears the selected frame, that should work OK now. B. Changes to not create a current_frame until we need one: * blockframe.c (get_current_frame): If current_frame is NULL, try to create an innermost frame. * sparc-tdep.c (sparc_pop_frame), infcmd.c (run-stack_dummy), infrun.c (wait_for_inferior), thread.c (thread_switch), convex-tdep.c (set_thread_command), a29k-tdep.c (pop_frame), alpha-tdep.c (alpha_pop_frame), convex-xdep.c (core_file_command), h8300-tdep.c (h8300_pop_frame), h8500-tdep.c (h8300_pop_frame), hppa-tdep.c (hppa_pop_frame), i386-tdep.c (i386_pop_frame), i960-tdep.c (pop_frame), m68k-tdep.c (m68k_pop_frame), mips-tdep.c (mips_pop_frame), rs6000-tdep.c (push_dummy_frame, pop_dummy_frame, pop_frame), sh-tdep.c (pop_frame), config/arm/tm-arm.h (POP_FRAME), config/convex/tm-convex.h (POP_FRAME), config/gould/tm-pn.h (POP_FRAME), config/ns32k/tm-merlin.h (POP_FRAME), config/ns32k/tm-umax.h (POP_FRAME), config/tahoe/tm-tahoe.h (POP_FRAME), config/vax/tm-vax.h (POP_FRAME): Don't call create_new_frame. * corelow.c (core_open), altos-xdep.c (core_file_command), arm-xdep.c (core_file_command), gould-xdep.c (core_file_command), m3-nat.c (select_thread), sun386-nat.c (core_file_command), umax-xdep.c (core_file_command): Don't call create_new_frame; do call flush_cached_frames. * blockframe.c (reinit_frame_cache): Don't call create_new_frame or select_frame. C. Changes to get rid of stop_frame_address and instead only fetch the frame pointer when we need it. * breakpoint.c (bpstat_stop_status): Remove argument frame_address; use FRAME_FP (get_current_frame ()). * infrun.c (wait_for_inferior): Don't pass frame pointer to bpstat_stop_status. * infrun.c (wait_for_inferior): Use FRAME_FP (get_current_frame ()) instead of stop_frame_address. * infrun.c (save_inferior_status, restore_inferior_status), inferior.h (struct inferior_status): Don't save and restore stop_frame_address. * inferior.h, infcmd.c, thread.c (thread_switch), m3-nat.c (select_thread): Remove stop_frame_address and uses thereof. D. Same thing for the stack pointer. * infrun.c (wait_for_inferior): Remove stop_sp and replace uses thereof with read_sp (). E. Change to eliminate one nasty little spot where we were wanting to know the frame pointer from before the current step (idea from GDB 3.5, which saved my ass, because my other ideas of how to fix it were very baroque). * infrun.c: Remove prev_frame_address. * infrun.c (wait_for_inferior, step_over_function): Use step_frame_address instead of prev_frame_address. F. Same basic idea for the stack pointer. * inferior.h, infcmd.c: New variable step_sp. * infcmd.c (step_1, until_next_command): Set it. * infrun.c: Remove prev_sp and replace uses by step_sp. * infrun.c (wait_for_inferior): If we get out of the step range, then set step_sp to the current stack pointer before we start going again.
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flush_cached_frames ();
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select_frame (get_current_frame (), 0);
validate_files ();
}
else if (from_tty)
printf_unfiltered ("No core file now.\n");
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}
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);
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memcpy (registers, &inferior_registers, sizeof inferior_registers);
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memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)],inferior_fp_registers.f_st,
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sizeof inferior_fp_registers.f_st);
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memcpy (&registers[REGISTER_BYTE (FPC_REGNUM)],
&inferior_fp_registers.f_ctrl,
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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[];
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memcpy (&inferior_registers, registers, 20 * 4);
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memcpy (inferior_fp_registers.f_st,
&registers[REGISTER_BYTE (FP0_REGNUM)],
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sizeof inferior_fp_registers.f_st);
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memcpy (&inferior_fp_registers.f_ctrl,
&registers[REGISTER_BYTE (FPC_REGNUM)],
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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);
}