[binutils.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 ([email protected]),
   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 ([email protected]),
	4	C2V Paris, April 89.
	5
	6	This file is part of GDB.
	7
	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.
	12
	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.
	17
	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, Boston, MA 02111-1307, USA. */
	21
	22	#include "defs.h"
	23	#include "frame.h"
	24	#include "inferior.h"
	25	#include "gdbcore.h"
	26
	27	#include <sys/param.h>
	28	#include <sys/dir.h>
	29	#include <sys/user.h>
	30	#include <signal.h>
	31	#include <sys/ioctl.h>
	32	#include <fcntl.h>
	33
	34	#include <sys/ptrace.h>
	35	#include <machine/reg.h>
	36
	37	#include <sys/file.h>
	38	#include "gdb_stat.h"
	39	#include <sys/core.h>
	40
	41	\f
	42	/* Machine-dependent code which would otherwise be in corefile.c */
	43	/* Work with core files, for GDB. */
	44
	45	\f
	46	void
	47	core_file_command (filename, from_tty)
	48	char *filename;
	49	int from_tty;
	50	{
	51	int val;
c906108c SS	52
	53	/* Discard all vestiges of any previous core file
	54	and mark data and stack spaces as empty. */
	55
	56	if (corefile)
	57	free (corefile);
	58	corefile = 0;
	59
	60	if (corechan >= 0)
	61	close (corechan);
	62	corechan = -1;
	63
	64	data_start = 0;
	65	data_end = 0;
	66	stack_start = STACK_END_ADDR;
	67	stack_end = STACK_END_ADDR;
	68
	69	/* Now, if a new core file was specified, open it and digest it. */
	70
	71	if (filename)
	72	{
	73	filename = tilde_expand (filename);
	74	make_cleanup (free, filename);
	75
	76	if (have_inferior_p ())
	77	error ("To look at a core file, you must kill the program with \"kill\".");
	78	corechan = open (filename, O_RDONLY, 0);
	79	if (corechan < 0)
	80	perror_with_name (filename);
	81
	82	{
	83	struct core corestr;
	84
	85	val = myread (corechan, &corestr, sizeof corestr);
	86	if (val < 0)
	87	perror_with_name (filename);
	88	if (corestr.c_magic != CORE_MAGIC)
	89	error ("\"%s\" does not appear to be a core dump file (magic 0x%x, expected 0x%x)",
	90	filename, corestr.c_magic, (int) CORE_MAGIC);
	91	else if (sizeof (struct core) != corestr.c_len)
	92	error ("\"%s\" has an invalid struct core length (%d, expected %d)",
	93	filename, corestr.c_len, (int) sizeof (struct core));
	94
	95	data_start = exec_data_start;
	96	data_end = data_start + corestr.c_dsize;
	97	stack_start = stack_end - corestr.c_ssize;
	98	data_offset = sizeof corestr;
	99	stack_offset = sizeof corestr + corestr.c_dsize;
	100
	101	memcpy (registers, &corestr.c_regs, sizeof corestr.c_regs);
	102
	103	memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)],
	104	corestr.c_fpu.f_fpstatus.f_st,
	105	sizeof corestr.c_fpu.f_fpstatus.f_st);
	106	memcpy (&registers[REGISTER_BYTE (FPC_REGNUM)],
	107	&corestr.c_fpu.f_fpstatus.f_ctrl,
	108	sizeof corestr.c_fpu.f_fpstatus -
	109	sizeof corestr.c_fpu.f_fpstatus.f_st);
	110
	111	/* the struct aouthdr of sun coff is not the struct exec stored
	112	in the core file. */
	113	memcpy (&core_aouthdr, &corestr.c_aouthdr, sizeof (struct exec));
	114	#ifndef COFF_ENCAPSULATE
	115	core_aouthdr.magic = corestr.c_aouthdr.a_info;
116	core_aouthdr.vstamp = /SUNVERSION/ 31252;
117	#endif
118	printf_unfiltered ("Core file is from \"%s\".\n", corestr.c_cmdname);
119	if (corestr.c_signo > 0)
120	printf_unfiltered ("Program terminated with signal %d, %s.\n",
121	corestr.c_signo, safe_strsignal (corestr.c_signo));
122	}
123	if (filename[0] == '/')
124	corefile = savestring (filename, strlen (filename));
125	else
126	{
127	corefile = concat (current_directory, "/", filename, NULL);
128	}
129
130	flush_cached_frames ();
131	select_frame (get_current_frame (), 0);
132
133	validate_files ();
134	}
135	else if (from_tty)
136	printf_unfiltered ("No core file now.\n");
137	}
138
139	i387_to_double (from, to)
140	char *from;
141	char *to;
142	{
143	long *lp;
144	/* push extended mode on 387 stack, then pop in double mode
145	*
146	* first, set exception masks so no error is generated -
147	* number will be rounded to inf or 0, if necessary
148	*/
149	asm ("pushl %eax"); /* grab a stack slot */
150	asm ("fstcw (%esp)"); /* get 387 control word */
151	asm ("movl (%esp),%eax"); /* save old value */
152	asm ("orl $0x3f,%eax"); /* mask all exceptions */
153	asm ("pushl %eax");
154	asm ("fldcw (%esp)"); /* load new value into 387 */
155
156	asm ("movl 8(%ebp),%eax");
157	asm ("fldt (%eax)"); /* push extended number on 387 stack */
158	asm ("fwait");
159	asm ("movl 12(%ebp),%eax");
160	asm ("fstpl (%eax)"); /* pop double */
161	asm ("fwait");
162
163	asm ("popl %eax"); /* flush modified control word */
164	asm ("fnclex"); /* clear exceptions */
165	asm ("fldcw (%esp)"); /* restore original control word */
166	asm ("popl %eax"); /* flush saved copy */
167	}
168
169	double_to_i387 (from, to)
170	char *from;
171	char *to;
172	{
173	/* push double mode on 387 stack, then pop in extended mode
174	* no errors are possible because every 64-bit pattern
175	* can be converted to an extended
176	*/
177	asm ("movl 8(%ebp),%eax");
178	asm ("fldl (%eax)");
179	asm ("fwait");
180	asm ("movl 12(%ebp),%eax");
181	asm ("fstpt (%eax)");
182	asm ("fwait");
183	}
184
185	void
186	fetch_inferior_registers (regno)
187	int regno;
188	{
189	struct regs inferior_registers;
190	struct fp_state inferior_fp_registers;
c906108c SS	191
	192	registers_fetched ();
	193
	194	ptrace (PTRACE_GETREGS, inferior_pid,
	195	(PTRACE_ARG3_TYPE) &inferior_registers);
	196	ptrace (PTRACE_GETFPREGS, inferior_pid,
	197	(PTRACE_ARG3_TYPE) &inferior_fp_registers);
	198
	199	memcpy (registers, &inferior_registers, sizeof inferior_registers);
	200
	201	memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)],inferior_fp_registers.f_st,
	202	sizeof inferior_fp_registers.f_st);
	203	memcpy (&registers[REGISTER_BYTE (FPC_REGNUM)],
	204	&inferior_fp_registers.f_ctrl,
	205	sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
	206	}
	207
	208	/* Store our register values back into the inferior.
	209	If REGNO is -1, do this for all registers.
	210	Otherwise, REGNO specifies which register (so we can save time). */
	211
	212	void
	213	store_inferior_registers (regno)
	214	int regno;
	215	{
	216	struct regs inferior_registers;
	217	struct fp_state inferior_fp_registers;
c906108c SS	218
	219	memcpy (&inferior_registers, registers, 20 * 4);
	220
	221	memcpy (inferior_fp_registers.f_st,
	222	&registers[REGISTER_BYTE (FP0_REGNUM)],
	223	sizeof inferior_fp_registers.f_st);
	224	memcpy (&inferior_fp_registers.f_ctrl,
	225	&registers[REGISTER_BYTE (FPC_REGNUM)],
	226	sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
	227
	228	#ifdef PTRACE_FP_BUG
	229	if (regno == FP_REGNUM \|\| regno == -1)
	230	/* Storing the frame pointer requires a gross hack, in which an
	231	instruction that moves eax into ebp gets single-stepped. */
	232	{
	233	int stack = inferior_registers.r_reg[SP_REGNUM];
	234	int stuff = ptrace (PTRACE_PEEKDATA, inferior_pid,
	235	(PTRACE_ARG3_TYPE) stack);
	236	int reg = inferior_registers.r_reg[EAX];
	237	inferior_registers.r_reg[EAX] =
	238	inferior_registers.r_reg[FP_REGNUM];
	239	ptrace (PTRACE_SETREGS, inferior_pid,
	240	(PTRACE_ARG3_TYPE) &inferior_registers);
	241	ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack,
	242	0xc589);
	243	ptrace (PTRACE_SINGLESTEP, inferior_pid, (PTRACE_ARG3_TYPE) stack,
	244	0);
	245	wait (0);
	246	ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack,
	247	stuff);
	248	inferior_registers.r_reg[EAX] = reg;
	249	}
	250	#endif
	251	ptrace (PTRACE_SETREGS, inferior_pid,
	252	(PTRACE_ARG3_TYPE) &inferior_registers);
	253	ptrace (PTRACE_SETFPREGS, inferior_pid,
	254	(PTRACE_ARG3_TYPE) &inferior_fp_registers);
	255	}