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