[thirdparty/binutils-gdb.git] / 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., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#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 "gdb_stat.h"
#include <sys/core.h>
\f

/* Machine-dependent code which would otherwise be in corefile.c */
/* Work with core files, for GDB. */
\f

void
core_file_command (filename, from_tty)
     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)
    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\".");
      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 (&registers[REGISTER_BYTE (FP0_REGNUM)],
		corestr.c_fpu.f_fpstatus.f_st,
		sizeof corestr.c_fpu.f_fpstatus.f_st);
	memcpy (&registers[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 (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");
}

void
fetch_inferior_registers (regno)
     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 (&registers[REGISTER_BYTE (FP0_REGNUM)], inferior_fp_registers.f_st,
	  sizeof inferior_fp_registers.f_st);
  memcpy (&registers[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 (regno)
     int regno;
{
  struct regs inferior_registers;
  struct fp_state inferior_fp_registers;

  memcpy (&inferior_registers, registers, 20 * 4);

  memcpy (inferior_fp_registers.f_st,
	  &registers[REGISTER_BYTE (FP0_REGNUM)],
	  sizeof inferior_fp_registers.f_st);
  memcpy (&inferior_fp_registers.f_ctrl,
	  &registers[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);
}
Commit	Line	Data
c906108c SS	1	/* Native support for Sun 386i's for GDB, the GNU debugger.
	2	Copyright (C) 1986, 1987, 1989, 1991, 1992 Free Software Foundation, Inc.
	3	Changes for sun386i by Jean Daniel Fekete (jdf@litp.univ-p6-7.fr),
	4	C2V Paris, April 89.
	5
c5aa993b	6	This file is part of GDB.
c906108c	7
c5aa993b JM	8	This program is free software; you can redistribute it and/or modify
	9	it under the terms of the GNU General Public License as published by
	10	the Free Software Foundation; either version 2 of the License, or
	11	(at your option) any later version.
c906108c	12
c5aa993b JM	13	This program is distributed in the hope that it will be useful,
	14	but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	GNU General Public License for more details.
c906108c	17
c5aa993b JM	18	You should have received a copy of the GNU General Public License
	19	along with this program; if not, write to the Free Software
	20	Foundation, Inc., 59 Temple Place - Suite 330,
	21	Boston, MA 02111-1307, USA. */
c906108c SS	22
	23	#include "defs.h"
	24	#include "frame.h"
	25	#include "inferior.h"
	26	#include "gdbcore.h"
	27
	28	#include <sys/param.h>
	29	#include <sys/dir.h>
	30	#include <sys/user.h>
	31	#include <signal.h>
	32	#include <sys/ioctl.h>
	33	#include <fcntl.h>
	34
	35	#include <sys/ptrace.h>
	36	#include <machine/reg.h>
	37
	38	#include <sys/file.h>
	39	#include "gdb_stat.h"
	40	#include <sys/core.h>
c906108c	41	\f
c5aa993b	42
c906108c SS	43	/* Machine-dependent code which would otherwise be in corefile.c */
c906108c SS	44	/* Work with core files, for GDB. */
c906108c	45	\f
c5aa993b	46
c906108c SS	47	void
	48	core_file_command (filename, from_tty)
	49	char *filename;
	50	int from_tty;
	51	{
	52	int val;
c906108c SS	53
	54	/* Discard all vestiges of any previous core file
	55	and mark data and stack spaces as empty. */
	56
	57	if (corefile)
	58	free (corefile);
	59	corefile = 0;
	60
	61	if (corechan >= 0)
	62	close (corechan);
	63	corechan = -1;
	64
	65	data_start = 0;
	66	data_end = 0;
	67	stack_start = STACK_END_ADDR;
	68	stack_end = STACK_END_ADDR;
	69
	70	/* Now, if a new core file was specified, open it and digest it. */
	71
	72	if (filename)
	73	{
	74	filename = tilde_expand (filename);
	75	make_cleanup (free, filename);
c5aa993b	76
c906108c SS	77	if (have_inferior_p ())
	78	error ("To look at a core file, you must kill the program with \"kill\".");
	79	corechan = open (filename, O_RDONLY, 0);
	80	if (corechan < 0)
	81	perror_with_name (filename);
	82
	83	{
	84	struct core corestr;
	85
	86	val = myread (corechan, &corestr, sizeof corestr);
	87	if (val < 0)
	88	perror_with_name (filename);
	89	if (corestr.c_magic != CORE_MAGIC)
	90	error ("\"%s\" does not appear to be a core dump file (magic 0x%x, expected 0x%x)",
	91	filename, corestr.c_magic, (int) CORE_MAGIC);
	92	else if (sizeof (struct core) != corestr.c_len)
c5aa993b JM	93	error ("\"%s\" has an invalid struct core length (%d, expected %d)",
c5aa993b JM	94	filename, corestr.c_len, (int) sizeof (struct core));
c906108c SS	95
	96	data_start = exec_data_start;
	97	data_end = data_start + corestr.c_dsize;
	98	stack_start = stack_end - corestr.c_ssize;
	99	data_offset = sizeof corestr;
	100	stack_offset = sizeof corestr + corestr.c_dsize;
	101
	102	memcpy (registers, &corestr.c_regs, sizeof corestr.c_regs);
	103
	104	memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)],
c5aa993b JM	105	corestr.c_fpu.f_fpstatus.f_st,
c5aa993b JM	106	sizeof corestr.c_fpu.f_fpstatus.f_st);
c906108c	107	memcpy (&registers[REGISTER_BYTE (FPC_REGNUM)],
c5aa993b JM	108	&corestr.c_fpu.f_fpstatus.f_ctrl,
	109	sizeof corestr.c_fpu.f_fpstatus -
	110	sizeof corestr.c_fpu.f_fpstatus.f_st);
c906108c SS	111
	112	/* the struct aouthdr of sun coff is not the struct exec stored
	113	in the core file. */
	114	memcpy (&core_aouthdr, &corestr.c_aouthdr, sizeof (struct exec));
	115	#ifndef COFF_ENCAPSULATE
	116	core_aouthdr.magic = corestr.c_aouthdr.a_info;
c5aa993b	117	core_aouthdr.vstamp = /SUNVERSION / 31252;
c906108c SS	118	#endif
	119	printf_unfiltered ("Core file is from \"%s\".\n", corestr.c_cmdname);
	120	if (corestr.c_signo > 0)
	121	printf_unfiltered ("Program terminated with signal %d, %s.\n",
c5aa993b	122	corestr.c_signo, safe_strsignal (corestr.c_signo));
c906108c SS	123	}
	124	if (filename[0] == '/')
	125	corefile = savestring (filename, strlen (filename));
	126	else
	127	{
	128	corefile = concat (current_directory, "/", filename, NULL);
	129	}
	130
	131	flush_cached_frames ();
	132	select_frame (get_current_frame (), 0);
	133
	134	validate_files ();
	135	}
	136	else if (from_tty)
	137	printf_unfiltered ("No core file now.\n");
	138	}
	139
	140	i387_to_double (from, to)
	141	char *from;
	142	char *to;
	143	{
	144	long *lp;
	145	/* push extended mode on 387 stack, then pop in double mode
c5aa993b	146
c906108c SS	147	* first, set exception masks so no error is generated -
	148	* number will be rounded to inf or 0, if necessary
	149	*/
c5aa993b	150	asm ("pushl %eax"); /* grab a stack slot */
c906108c SS	151	asm ("fstcw (%esp)"); /* get 387 control word */
c906108c SS	152	asm ("movl (%esp),%eax"); /* save old value */
c5aa993b	153	asm ("orl $0x3f,%eax"); /* mask all exceptions */
c906108c SS	154	asm ("pushl %eax");
c906108c SS	155	asm ("fldcw (%esp)"); /* load new value into 387 */
c5aa993b	156
c906108c SS	157	asm ("movl 8(%ebp),%eax");
	158	asm ("fldt (%eax)"); /* push extended number on 387 stack */
	159	asm ("fwait");
	160	asm ("movl 12(%ebp),%eax");
	161	asm ("fstpl (%eax)"); /* pop double */
	162	asm ("fwait");
c5aa993b	163
c906108c	164	asm ("popl %eax"); /* flush modified control word */
c5aa993b	165	asm ("fnclex"); /* clear exceptions */
c906108c SS	166	asm ("fldcw (%esp)"); /* restore original control word */
	167	asm ("popl %eax"); /* flush saved copy */
	168	}
	169
	170	double_to_i387 (from, to)
	171	char *from;
	172	char *to;
	173	{
	174	/* push double mode on 387 stack, then pop in extended mode
	175	* no errors are possible because every 64-bit pattern
	176	* can be converted to an extended
	177	*/
	178	asm ("movl 8(%ebp),%eax");
	179	asm ("fldl (%eax)");
	180	asm ("fwait");
	181	asm ("movl 12(%ebp),%eax");
	182	asm ("fstpt (%eax)");
	183	asm ("fwait");
	184	}
	185
	186	void
	187	fetch_inferior_registers (regno)
	188	int regno;
	189	{
	190	struct regs inferior_registers;
	191	struct fp_state inferior_fp_registers;
c906108c SS	192
	193	registers_fetched ();
	194
	195	ptrace (PTRACE_GETREGS, inferior_pid,
c5aa993b	196	(PTRACE_ARG3_TYPE) & inferior_registers);
c906108c	197	ptrace (PTRACE_GETFPREGS, inferior_pid,
c5aa993b	198	(PTRACE_ARG3_TYPE) & inferior_fp_registers);
c906108c SS	199
	200	memcpy (registers, &inferior_registers, sizeof inferior_registers);
	201
c5aa993b JM	202	memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)], inferior_fp_registers.f_st,
c5aa993b JM	203	sizeof inferior_fp_registers.f_st);
c906108c	204	memcpy (&registers[REGISTER_BYTE (FPC_REGNUM)],
c5aa993b JM	205	&inferior_fp_registers.f_ctrl,
c5aa993b JM	206	sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
c906108c SS	207	}
	208
	209	/* Store our register values back into the inferior.
	210	If REGNO is -1, do this for all registers.
	211	Otherwise, REGNO specifies which register (so we can save time). */
	212
	213	void
	214	store_inferior_registers (regno)
	215	int regno;
	216	{
	217	struct regs inferior_registers;
	218	struct fp_state inferior_fp_registers;
c906108c SS	219
	220	memcpy (&inferior_registers, registers, 20 * 4);
	221
	222	memcpy (inferior_fp_registers.f_st,
c5aa993b JM	223	&registers[REGISTER_BYTE (FP0_REGNUM)],
c5aa993b JM	224	sizeof inferior_fp_registers.f_st);
c906108c	225	memcpy (&inferior_fp_registers.f_ctrl,
c5aa993b JM	226	&registers[REGISTER_BYTE (FPC_REGNUM)],
	227	sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
	228
c906108c SS	229	#ifdef PTRACE_FP_BUG
	230	if (regno == FP_REGNUM \|\| regno == -1)
	231	/* Storing the frame pointer requires a gross hack, in which an
	232	instruction that moves eax into ebp gets single-stepped. */
	233	{
	234	int stack = inferior_registers.r_reg[SP_REGNUM];
	235	int stuff = ptrace (PTRACE_PEEKDATA, inferior_pid,
	236	(PTRACE_ARG3_TYPE) stack);
	237	int reg = inferior_registers.r_reg[EAX];
	238	inferior_registers.r_reg[EAX] =
	239	inferior_registers.r_reg[FP_REGNUM];
c5aa993b JM	240	ptrace (PTRACE_SETREGS, inferior_pid,
c5aa993b JM	241	(PTRACE_ARG3_TYPE) & inferior_registers);
c906108c SS	242	ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack,
	243	0xc589);
	244	ptrace (PTRACE_SINGLESTEP, inferior_pid, (PTRACE_ARG3_TYPE) stack,
	245	0);
	246	wait (0);
	247	ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack,
	248	stuff);
	249	inferior_registers.r_reg[EAX] = reg;
	250	}
	251	#endif
	252	ptrace (PTRACE_SETREGS, inferior_pid,
c5aa993b	253	(PTRACE_ARG3_TYPE) & inferior_registers);
c906108c	254	ptrace (PTRACE_SETFPREGS, inferior_pid,
c5aa993b	255	(PTRACE_ARG3_TYPE) & inferior_fp_registers);
c906108c	256	}