[deliverable/binutils-gdb.git] / gdb / sun386-xdep.c

/* Machine-dependent code for host Sun 386i's for GDB, the GNU debugger.
   Copyright (C) 1986, 1987, 1989, 1991 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>

\f
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,&registers[REGISTER_BYTE (FP0_REGNUM)],
	 sizeof inferior_fp_registers.f_st);
  bcopy (&inferior_fp_registers.f_ctrl,
	 &registers[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 (&registers[REGISTER_BYTE (FP0_REGNUM)],inferior_fp_registers.f_st,
	 sizeof inferior_fp_registers.f_st);
  bcopy (&registers[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);
}

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

\f
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,
	       &registers[REGISTER_BYTE (FP0_REGNUM)],
	       sizeof corestr.c_fpu.f_fpstatus.f_st);
	bcopy (&corestr.c_fpu.f_fpstatus.f_ctrl,
	       &registers[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_inferior_registers (regno)
     int regno;
{
}

/* ARGSUSED */
void
store_inferior_registers (regno)
     int regno;
{
}

/* 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.  */
Commit	Line	Data
dd3b648e RP	1	/* Machine-dependent code for host Sun 386i's for GDB, the GNU debugger.
	2	Copyright (C) 1986, 1987, 1989, 1991 Free Software Foundation, Inc.
	3	Changes for sun386i by Jean Daniel Fekete (jdf@litp.univ-p6-7.fr),
	4	C2V Paris, April 89.
	5
	6	This file is part of GDB.
	7
99a7de40	8	This program is free software; you can redistribute it and/or modify
dd3b648e	9	it under the terms of the GNU General Public License as published by
99a7de40 JG	10	the Free Software Foundation; either version 2 of the License, or
99a7de40 JG	11	(at your option) any later version.
dd3b648e	12
99a7de40	13	This program is distributed in the hope that it will be useful,
dd3b648e RP	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
99a7de40 JG	19	along with this program; if not, write to the Free Software
99a7de40 JG	20	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
dd3b648e	21
f0ca24b9 JK	22	#if defined (GDB_TARGET_IS_SUN386)
f0ca24b9 JK	23
dd3b648e	24	#include "defs.h"
dd3b648e RP	25	#include "frame.h"
dd3b648e RP	26	#include "inferior.h"
dd3b648e RP	27	#include "gdbcore.h"
	28
	29	#include <sys/param.h>
	30	#include <sys/dir.h>
	31	#include <sys/user.h>
	32	#include <signal.h>
	33	#include <sys/ioctl.h>
	34	#include <fcntl.h>
	35
	36	#include <sys/ptrace.h>
	37	#include <machine/reg.h>
	38
	39	#include <sys/file.h>
	40	#include <sys/stat.h>
	41	#include <sys/core.h>
7919c3ed	42
dd3b648e RP	43	\f
dd3b648e RP	44	void
7919c3ed JG	45	fetch_inferior_registers (regno)
7919c3ed JG	46	int regno;
dd3b648e RP	47	{
	48	struct regs inferior_registers;
	49	struct fp_state inferior_fp_registers;
	50	extern char registers[];
	51
	52	registers_fetched ();
	53
e676a15f FF	54	ptrace (PTRACE_GETREGS, inferior_pid,
	55	(PTRACE_ARG3_TYPE) &inferior_registers);
	56	ptrace (PTRACE_GETFPREGS, inferior_pid,
	57	(PTRACE_ARG3_TYPE) &inferior_fp_registers);
dd3b648e RP	58
	59	bcopy (&inferior_registers, registers, sizeof inferior_registers);
	60
	61	bcopy (inferior_fp_registers.f_st,&registers[REGISTER_BYTE (FP0_REGNUM)],
	62	sizeof inferior_fp_registers.f_st);
	63	bcopy (&inferior_fp_registers.f_ctrl,
	64	&registers[REGISTER_BYTE (FPC_REGNUM)],
	65	sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
	66	}
	67
	68	/* Store our register values back into the inferior.
	69	If REGNO is -1, do this for all registers.
	70	Otherwise, REGNO specifies which register (so we can save time). */
	71
7919c3ed	72	void
dd3b648e RP	73	store_inferior_registers (regno)
	74	int regno;
	75	{
	76	struct regs inferior_registers;
	77	struct fp_state inferior_fp_registers;
	78	extern char registers[];
	79
	80	bcopy (registers, &inferior_registers, 20 * 4);
	81
	82	bcopy (&registers[REGISTER_BYTE (FP0_REGNUM)],inferior_fp_registers.f_st,
	83	sizeof inferior_fp_registers.f_st);
	84	bcopy (&registers[REGISTER_BYTE (FPC_REGNUM)],
	85	&inferior_fp_registers.f_ctrl,
	86	sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
	87
	88	#ifdef PTRACE_FP_BUG
	89	if (regno == FP_REGNUM \|\| regno == -1)
	90	/* Storing the frame pointer requires a gross hack, in which an
	91	instruction that moves eax into ebp gets single-stepped. */
	92	{
	93	int stack = inferior_registers.r_reg[SP_REGNUM];
e676a15f FF	94	int stuff = ptrace (PTRACE_PEEKDATA, inferior_pid,
e676a15f FF	95	(PTRACE_ARG3_TYPE) stack);
dd3b648e RP	96	int reg = inferior_registers.r_reg[EAX];
	97	inferior_registers.r_reg[EAX] =
	98	inferior_registers.r_reg[FP_REGNUM];
e676a15f FF	99	ptrace (PTRACE_SETREGS, inferior_pid,
	100	(PTRACE_ARG3_TYPE) &inferior_registers);
	101	ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack,
	102	0xc589);
	103	ptrace (PTRACE_SINGLESTEP, inferior_pid, (PTRACE_ARG3_TYPE) stack,
	104	0);
dd3b648e	105	wait (0);
e676a15f FF	106	ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack,
e676a15f FF	107	stuff);
dd3b648e RP	108	inferior_registers.r_reg[EAX] = reg;
	109	}
	110	#endif
e676a15f FF	111	ptrace (PTRACE_SETREGS, inferior_pid,
	112	(PTRACE_ARG3_TYPE) &inferior_registers);
	113	ptrace (PTRACE_SETFPREGS, inferior_pid,
	114	(PTRACE_ARG3_TYPE) &inferior_fp_registers);
dd3b648e RP	115	}
	116
	117	/* Machine-dependent code which would otherwise be in core.c */
	118	/* Work with core files, for GDB. */
	119
	120	\f
	121	void
	122	core_file_command (filename, from_tty)
	123	char *filename;
	124	int from_tty;
	125	{
	126	int val;
	127	extern char registers[];
	128
	129	/* Discard all vestiges of any previous core file
	130	and mark data and stack spaces as empty. */
	131
	132	if (corefile)
	133	free (corefile);
	134	corefile = 0;
	135
	136	if (corechan >= 0)
	137	close (corechan);
	138	corechan = -1;
	139
	140	data_start = 0;
	141	data_end = 0;
	142	stack_start = STACK_END_ADDR;
	143	stack_end = STACK_END_ADDR;
	144
	145	/* Now, if a new core file was specified, open it and digest it. */
	146
	147	if (filename)
	148	{
	149	filename = tilde_expand (filename);
	150	make_cleanup (free, filename);
	151
	152	if (have_inferior_p ())
	153	error ("To look at a core file, you must kill the inferior with \"kill\".");
	154	corechan = open (filename, O_RDONLY, 0);
	155	if (corechan < 0)
	156	perror_with_name (filename);
	157
	158	{
	159	struct core corestr;
	160
	161	val = myread (corechan, &corestr, sizeof corestr);
	162	if (val < 0)
	163	perror_with_name (filename);
	164	if (corestr.c_magic != CORE_MAGIC)
	165	error ("\"%s\" does not appear to be a core dump file (magic 0x%x, expected 0x%x)",
	166	filename, corestr.c_magic, (int) CORE_MAGIC);
	167	else if (sizeof (struct core) != corestr.c_len)
	168	error ("\"%s\" has an invalid struct core length (%d, expected %d)",
	169	filename, corestr.c_len, (int) sizeof (struct core));
	170
	171	data_start = exec_data_start;
	172	data_end = data_start + corestr.c_dsize;
	173	stack_start = stack_end - corestr.c_ssize;
	174	data_offset = sizeof corestr;
	175	stack_offset = sizeof corestr + corestr.c_dsize;
	176
	177	bcopy (&corestr.c_regs, registers, sizeof corestr.c_regs);
	178
179	bcopy (corestr.c_fpu.f_fpstatus.f_st,
180	&registers[REGISTER_BYTE (FP0_REGNUM)],
181	sizeof corestr.c_fpu.f_fpstatus.f_st);
182	bcopy (&corestr.c_fpu.f_fpstatus.f_ctrl,
183	&registers[REGISTER_BYTE (FPC_REGNUM)],
184	sizeof corestr.c_fpu.f_fpstatus -
185	sizeof corestr.c_fpu.f_fpstatus.f_st);
186
187	/* the struct aouthdr of sun coff is not the struct exec stored
188	in the core file. */
189	bcopy (&corestr.c_aouthdr, &core_aouthdr, sizeof (struct exec));
190	#ifndef COFF_ENCAPSULATE
191	core_aouthdr.magic = corestr.c_aouthdr.a_info;
192	core_aouthdr.vstamp = /SUNVERSION/ 31252;
193	#endif
194	printf ("Core file is from \"%s\".\n", corestr.c_cmdname);
195	if (corestr.c_signo > 0)
196	printf ("Program terminated with signal %d, %s.\n",
4ace50a5	197	corestr.c_signo, safe_strsignal (corestr.c_signo));
dd3b648e RP	198	}
	199	if (filename[0] == '/')
	200	corefile = savestring (filename, strlen (filename));
	201	else
	202	{
58ae87f6	203	corefile = concat (current_directory, "/", filename, NULL);
dd3b648e RP	204	}
	205
	206	set_current_frame ( create_new_frame (read_register (FP_REGNUM),
	207	read_pc ()));
	208	select_frame (get_current_frame (), 0);
	209
	210	validate_files ();
	211	}
	212	else if (from_tty)
	213	printf ("No core file now.\n");
	214	}
	215
	216	i387_to_double (from, to)
	217	char *from;
	218	char *to;
	219	{
	220	long *lp;
	221	/* push extended mode on 387 stack, then pop in double mode
	222	*
	223	* first, set exception masks so no error is generated -
	224	* number will be rounded to inf or 0, if necessary
	225	*/
	226	asm ("pushl %eax"); /* grab a stack slot */
	227	asm ("fstcw (%esp)"); /* get 387 control word */
	228	asm ("movl (%esp),%eax"); /* save old value */
	229	asm ("orl $0x3f,%eax"); /* mask all exceptions */
	230	asm ("pushl %eax");
	231	asm ("fldcw (%esp)"); /* load new value into 387 */
	232
	233	asm ("movl 8(%ebp),%eax");
	234	asm ("fldt (%eax)"); /* push extended number on 387 stack */
	235	asm ("fwait");
	236	asm ("movl 12(%ebp),%eax");
	237	asm ("fstpl (%eax)"); /* pop double */
	238	asm ("fwait");
	239
	240	asm ("popl %eax"); /* flush modified control word */
	241	asm ("fnclex"); /* clear exceptions */
	242	asm ("fldcw (%esp)"); /* restore original control word */
	243	asm ("popl %eax"); /* flush saved copy */
	244	}
	245
	246	double_to_i387 (from, to)
	247	char *from;
	248	char *to;
	249	{
	250	/* push double mode on 387 stack, then pop in extended mode
	251	* no errors are possible because every 64-bit pattern
	252	* can be converted to an extended
	253	*/
	254	asm ("movl 8(%ebp),%eax");
	255	asm ("fldl (%eax)");
	256	asm ("fwait");
	257	asm ("movl 12(%ebp),%eax");
	258	asm ("fstpt (%eax)");
	259	asm ("fwait");
	260	}
f0ca24b9 JK	261	#else /* Not sun386 target. */
	262
	263	/* These functions shouldn't be called when we're cross-debugging. */
	264
7919c3ed	265	/* ARGSUSED */
f0ca24b9	266	void
7919c3ed JG	267	fetch_inferior_registers (regno)
7919c3ed JG	268	int regno;
f0ca24b9 JK	269	{
	270	}
	271
	272	/* ARGSUSED */
7919c3ed	273	void
f0ca24b9 JK	274	store_inferior_registers (regno)
	275	int regno;
	276	{
	277	}
	278
	279	/* ARGSUSED */
	280	void
7919c3ed	281	fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
f0ca24b9 JK	282	char *core_reg_sect;
	283	unsigned core_reg_size;
	284	int which;
7919c3ed	285	unsigned int reg_addr; /* Unused in this version */
f0ca24b9 JK	286	{
	287	}
	288
	289	#endif /* Not sun386 target. */