[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 ()
{
  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).  */

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.  */

void
fetch_inferior_registers ()
{
}

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

/* ARGSUSED */
void
fetch_core_registers (core_reg_sect, core_reg_size, which)
     char *core_reg_sect;
     unsigned core_reg_size;
     int which;
{
}

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