[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 <stdio.h>
#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 RP	24	#include <stdio.h>
dd3b648e RP	25	#include "defs.h"
dd3b648e RP	26	#include "frame.h"
	27	#include "inferior.h"
	28	#include "signame.h"
	29	#include "gdbcore.h"
	30
	31	#include <sys/param.h>
	32	#include <sys/dir.h>
	33	#include <sys/user.h>
	34	#include <signal.h>
	35	#include <sys/ioctl.h>
	36	#include <fcntl.h>
	37
	38	#include <sys/ptrace.h>
	39	#include <machine/reg.h>
	40
	41	#include <sys/file.h>
	42	#include <sys/stat.h>
	43	#include <sys/core.h>
7919c3ed	44
dd3b648e RP	45	\f
dd3b648e RP	46	void
7919c3ed JG	47	fetch_inferior_registers (regno)
7919c3ed JG	48	int regno;
dd3b648e RP	49	{
	50	struct regs inferior_registers;
	51	struct fp_state inferior_fp_registers;
	52	extern char registers[];
	53
	54	registers_fetched ();
	55
	56	ptrace (PTRACE_GETREGS, inferior_pid, &inferior_registers);
	57	ptrace (PTRACE_GETFPREGS, inferior_pid, &inferior_fp_registers);
	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];
	94	int stuff = ptrace (PTRACE_PEEKDATA, inferior_pid, stack);
	95	int reg = inferior_registers.r_reg[EAX];
	96	inferior_registers.r_reg[EAX] =
	97	inferior_registers.r_reg[FP_REGNUM];
	98	ptrace (PTRACE_SETREGS, inferior_pid, &inferior_registers);
	99	ptrace (PTRACE_POKEDATA, inferior_pid, stack, 0xc589);
	100	ptrace (PTRACE_SINGLESTEP, inferior_pid, stack, 0);
	101	wait (0);
	102	ptrace (PTRACE_POKEDATA, inferior_pid, stack, stuff);
	103	inferior_registers.r_reg[EAX] = reg;
	104	}
	105	#endif
	106	ptrace (PTRACE_SETREGS, inferior_pid, &inferior_registers);
	107	ptrace (PTRACE_SETFPREGS, inferior_pid, &inferior_fp_registers);
	108	}
	109
	110	/* Machine-dependent code which would otherwise be in core.c */
	111	/* Work with core files, for GDB. */
	112
	113	\f
	114	void
	115	core_file_command (filename, from_tty)
	116	char *filename;
	117	int from_tty;
	118	{
	119	int val;
	120	extern char registers[];
	121
	122	/* Discard all vestiges of any previous core file
	123	and mark data and stack spaces as empty. */
	124
	125	if (corefile)
	126	free (corefile);
	127	corefile = 0;
	128
	129	if (corechan >= 0)
	130	close (corechan);
	131	corechan = -1;
	132
	133	data_start = 0;
	134	data_end = 0;
	135	stack_start = STACK_END_ADDR;
	136	stack_end = STACK_END_ADDR;
137
138	/* Now, if a new core file was specified, open it and digest it. */
139
140	if (filename)
141	{
142	filename = tilde_expand (filename);
143	make_cleanup (free, filename);
144
145	if (have_inferior_p ())
146	error ("To look at a core file, you must kill the inferior with \"kill\".");
147	corechan = open (filename, O_RDONLY, 0);
148	if (corechan < 0)
149	perror_with_name (filename);
150
151	{
152	struct core corestr;
153
154	val = myread (corechan, &corestr, sizeof corestr);
155	if (val < 0)
156	perror_with_name (filename);
157	if (corestr.c_magic != CORE_MAGIC)
158	error ("\"%s\" does not appear to be a core dump file (magic 0x%x, expected 0x%x)",
159	filename, corestr.c_magic, (int) CORE_MAGIC);
160	else if (sizeof (struct core) != corestr.c_len)
161	error ("\"%s\" has an invalid struct core length (%d, expected %d)",
162	filename, corestr.c_len, (int) sizeof (struct core));
163
164	data_start = exec_data_start;
165	data_end = data_start + corestr.c_dsize;
166	stack_start = stack_end - corestr.c_ssize;
167	data_offset = sizeof corestr;
168	stack_offset = sizeof corestr + corestr.c_dsize;
169
170	bcopy (&corestr.c_regs, registers, sizeof corestr.c_regs);
171
172	bcopy (corestr.c_fpu.f_fpstatus.f_st,
173	&registers[REGISTER_BYTE (FP0_REGNUM)],
174	sizeof corestr.c_fpu.f_fpstatus.f_st);
175	bcopy (&corestr.c_fpu.f_fpstatus.f_ctrl,
176	&registers[REGISTER_BYTE (FPC_REGNUM)],
177	sizeof corestr.c_fpu.f_fpstatus -
178	sizeof corestr.c_fpu.f_fpstatus.f_st);
179
180	/* the struct aouthdr of sun coff is not the struct exec stored
181	in the core file. */
182	bcopy (&corestr.c_aouthdr, &core_aouthdr, sizeof (struct exec));
183	#ifndef COFF_ENCAPSULATE
184	core_aouthdr.magic = corestr.c_aouthdr.a_info;
185	core_aouthdr.vstamp = /SUNVERSION/ 31252;
186	#endif
187	printf ("Core file is from \"%s\".\n", corestr.c_cmdname);
188	if (corestr.c_signo > 0)
189	printf ("Program terminated with signal %d, %s.\n",
190	corestr.c_signo,
191	corestr.c_signo < NSIG
192	? sys_siglist[corestr.c_signo]
193	: "(undocumented)");
194	}
195	if (filename[0] == '/')
196	corefile = savestring (filename, strlen (filename));
197	else
198	{
58ae87f6	199	corefile = concat (current_directory, "/", filename, NULL);
dd3b648e RP	200	}
	201
	202	set_current_frame ( create_new_frame (read_register (FP_REGNUM),
	203	read_pc ()));
	204	select_frame (get_current_frame (), 0);
	205
	206	validate_files ();
	207	}
	208	else if (from_tty)
	209	printf ("No core file now.\n");
	210	}
	211
	212	i387_to_double (from, to)
	213	char *from;
	214	char *to;
	215	{
	216	long *lp;
	217	/* push extended mode on 387 stack, then pop in double mode
	218	*
	219	* first, set exception masks so no error is generated -
	220	* number will be rounded to inf or 0, if necessary
	221	*/
	222	asm ("pushl %eax"); /* grab a stack slot */
	223	asm ("fstcw (%esp)"); /* get 387 control word */
	224	asm ("movl (%esp),%eax"); /* save old value */
	225	asm ("orl $0x3f,%eax"); /* mask all exceptions */
	226	asm ("pushl %eax");
	227	asm ("fldcw (%esp)"); /* load new value into 387 */
	228
	229	asm ("movl 8(%ebp),%eax");
	230	asm ("fldt (%eax)"); /* push extended number on 387 stack */
	231	asm ("fwait");
	232	asm ("movl 12(%ebp),%eax");
	233	asm ("fstpl (%eax)"); /* pop double */
	234	asm ("fwait");
	235
	236	asm ("popl %eax"); /* flush modified control word */
	237	asm ("fnclex"); /* clear exceptions */
	238	asm ("fldcw (%esp)"); /* restore original control word */
	239	asm ("popl %eax"); /* flush saved copy */
	240	}
	241
	242	double_to_i387 (from, to)
	243	char *from;
	244	char *to;
	245	{
	246	/* push double mode on 387 stack, then pop in extended mode
	247	* no errors are possible because every 64-bit pattern
	248	* can be converted to an extended
	249	*/
	250	asm ("movl 8(%ebp),%eax");
	251	asm ("fldl (%eax)");
	252	asm ("fwait");
	253	asm ("movl 12(%ebp),%eax");
	254	asm ("fstpt (%eax)");
	255	asm ("fwait");
	256	}
f0ca24b9 JK	257	#else /* Not sun386 target. */
	258
	259	/* These functions shouldn't be called when we're cross-debugging. */
	260
7919c3ed	261	/* ARGSUSED */
f0ca24b9	262	void
7919c3ed JG	263	fetch_inferior_registers (regno)
7919c3ed JG	264	int regno;
f0ca24b9 JK	265	{
	266	}
	267
	268	/* ARGSUSED */
7919c3ed	269	void
f0ca24b9 JK	270	store_inferior_registers (regno)
	271	int regno;
	272	{
	273	}
	274
	275	/* ARGSUSED */
	276	void
7919c3ed	277	fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
f0ca24b9 JK	278	char *core_reg_sect;
	279	unsigned core_reg_size;
	280	int which;
7919c3ed	281	unsigned int reg_addr; /* Unused in this version */
f0ca24b9 JK	282	{
	283	}
	284
	285	#endif /* Not sun386 target. */