[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., 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
/* 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 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;

	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_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.  */

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);
}
Commit	Line	Data
61bbb1c2 RP	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., 675 Mass Ave, Cambridge, MA 02139, USA. */
	21
	22	#if defined (GDB_TARGET_IS_SUN386)
	23
	24	#include "defs.h"
	25	#include "frame.h"
	26	#include "inferior.h"
	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>
	42
	43	\f
	44	/* Machine-dependent code which would otherwise be in core.c */
	45	/* Work with core files, for GDB. */
	46
	47	\f
	48	void
	49	core_file_command (filename, from_tty)
	50	char *filename;
	51	int from_tty;
	52	{
	53	int val;
	54	extern char registers[];
	55
	56	/* Discard all vestiges of any previous core file
	57	and mark data and stack spaces as empty. */
	58
	59	if (corefile)
	60	free (corefile);
	61	corefile = 0;
	62
	63	if (corechan >= 0)
	64	close (corechan);
65	corechan = -1;
66
67	data_start = 0;
68	data_end = 0;
69	stack_start = STACK_END_ADDR;
70	stack_end = STACK_END_ADDR;
71
72	/* Now, if a new core file was specified, open it and digest it. */
73
74	if (filename)
75	{
76	filename = tilde_expand (filename);
77	make_cleanup (free, filename);
78
79	if (have_inferior_p ())
6fe90fc8	80	error ("To look at a core file, you must kill the program with \"kill\".");
61bbb1c2 RP	81	corechan = open (filename, O_RDONLY, 0);
	82	if (corechan < 0)
	83	perror_with_name (filename);
	84
	85	{
	86	struct core corestr;
	87
	88	val = myread (corechan, &corestr, sizeof corestr);
	89	if (val < 0)
	90	perror_with_name (filename);
	91	if (corestr.c_magic != CORE_MAGIC)
	92	error ("\"%s\" does not appear to be a core dump file (magic 0x%x, expected 0x%x)",
	93	filename, corestr.c_magic, (int) CORE_MAGIC);
	94	else if (sizeof (struct core) != corestr.c_len)
	95	error ("\"%s\" has an invalid struct core length (%d, expected %d)",
	96	filename, corestr.c_len, (int) sizeof (struct core));
	97
	98	data_start = exec_data_start;
	99	data_end = data_start + corestr.c_dsize;
	100	stack_start = stack_end - corestr.c_ssize;
	101	data_offset = sizeof corestr;
	102	stack_offset = sizeof corestr + corestr.c_dsize;
	103
	104	bcopy (&corestr.c_regs, registers, sizeof corestr.c_regs);
	105
	106	bcopy (corestr.c_fpu.f_fpstatus.f_st,
	107	&registers[REGISTER_BYTE (FP0_REGNUM)],
	108	sizeof corestr.c_fpu.f_fpstatus.f_st);
	109	bcopy (&corestr.c_fpu.f_fpstatus.f_ctrl,
	110	&registers[REGISTER_BYTE (FPC_REGNUM)],
	111	sizeof corestr.c_fpu.f_fpstatus -
	112	sizeof corestr.c_fpu.f_fpstatus.f_st);
	113
	114	/* the struct aouthdr of sun coff is not the struct exec stored
	115	in the core file. */
	116	bcopy (&corestr.c_aouthdr, &core_aouthdr, sizeof (struct exec));
	117	#ifndef COFF_ENCAPSULATE
	118	core_aouthdr.magic = corestr.c_aouthdr.a_info;
	119	core_aouthdr.vstamp = /SUNVERSION/ 31252;
	120	#endif
	121	printf ("Core file is from \"%s\".\n", corestr.c_cmdname);
	122	if (corestr.c_signo > 0)
	123	printf ("Program terminated with signal %d, %s.\n",
	124	corestr.c_signo, safe_strsignal (corestr.c_signo));
	125	}
	126	if (filename[0] == '/')
	127	corefile = savestring (filename, strlen (filename));
	128	else
	129	{
	130	corefile = concat (current_directory, "/", filename, NULL);
	131	}
	132
	133	set_current_frame ( create_new_frame (read_register (FP_REGNUM),
	134	read_pc ()));
	135	select_frame (get_current_frame (), 0);
	136
	137	validate_files ();
	138	}
	139	else if (from_tty)
	140	printf ("No core file now.\n");
	141	}
	142
	143	i387_to_double (from, to)
	144	char *from;
145	char *to;
146	{
147	long *lp;
148	/* push extended mode on 387 stack, then pop in double mode
149	*
150	* first, set exception masks so no error is generated -
151	* number will be rounded to inf or 0, if necessary
152	*/
153	asm ("pushl %eax"); /* grab a stack slot */
154	asm ("fstcw (%esp)"); /* get 387 control word */
155	asm ("movl (%esp),%eax"); /* save old value */
156	asm ("orl $0x3f,%eax"); /* mask all exceptions */
157	asm ("pushl %eax");
158	asm ("fldcw (%esp)"); /* load new value into 387 */
159
160	asm ("movl 8(%ebp),%eax");
161	asm ("fldt (%eax)"); /* push extended number on 387 stack */
162	asm ("fwait");
163	asm ("movl 12(%ebp),%eax");
164	asm ("fstpl (%eax)"); /* pop double */
165	asm ("fwait");
166
167	asm ("popl %eax"); /* flush modified control word */
168	asm ("fnclex"); /* clear exceptions */
169	asm ("fldcw (%esp)"); /* restore original control word */
170	asm ("popl %eax"); /* flush saved copy */
171	}
172
173	double_to_i387 (from, to)
174	char *from;
175	char *to;
176	{
177	/* push double mode on 387 stack, then pop in extended mode
178	* no errors are possible because every 64-bit pattern
179	* can be converted to an extended
180	*/
181	asm ("movl 8(%ebp),%eax");
182	asm ("fldl (%eax)");
183	asm ("fwait");
184	asm ("movl 12(%ebp),%eax");
185	asm ("fstpt (%eax)");
186	asm ("fwait");
187	}
188	#else /* Not sun386 target. */
189
190	/* These functions shouldn't be called when we're cross-debugging. */
191
192	/* ARGSUSED */
193	void
194	fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
195	char *core_reg_sect;
196	unsigned core_reg_size;
197	int which;
198	unsigned int reg_addr; /* Unused in this version */
199	{
200	}
201
202	#endif /* Not sun386 target. */
203
204	void
205	fetch_inferior_registers (regno)
206	int regno;
207	{
208	struct regs inferior_registers;
209	struct fp_state inferior_fp_registers;
210	extern char registers[];
211
212	registers_fetched ();
213
214	ptrace (PTRACE_GETREGS, inferior_pid,
215	(PTRACE_ARG3_TYPE) &inferior_registers);
216	ptrace (PTRACE_GETFPREGS, inferior_pid,
217	(PTRACE_ARG3_TYPE) &inferior_fp_registers);
218
219	bcopy (&inferior_registers, registers, sizeof inferior_registers);
220
221	bcopy (inferior_fp_registers.f_st,&registers[REGISTER_BYTE (FP0_REGNUM)],
222	sizeof inferior_fp_registers.f_st);
223	bcopy (&inferior_fp_registers.f_ctrl,
224	&registers[REGISTER_BYTE (FPC_REGNUM)],
225	sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
226	}
227
228	/* Store our register values back into the inferior.
229	If REGNO is -1, do this for all registers.
230	Otherwise, REGNO specifies which register (so we can save time). */
231
232	void
233	store_inferior_registers (regno)
234	int regno;
235	{
236	struct regs inferior_registers;
237	struct fp_state inferior_fp_registers;
238	extern char registers[];
239
240	bcopy (registers, &inferior_registers, 20 * 4);
241
242	bcopy (&registers[REGISTER_BYTE (FP0_REGNUM)],inferior_fp_registers.f_st,
243	sizeof inferior_fp_registers.f_st);
244	bcopy (&registers[REGISTER_BYTE (FPC_REGNUM)],
245	&inferior_fp_registers.f_ctrl,
246	sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
247
248	#ifdef PTRACE_FP_BUG
249	if (regno == FP_REGNUM \|\| regno == -1)
250	/* Storing the frame pointer requires a gross hack, in which an
251	instruction that moves eax into ebp gets single-stepped. */
252	{
253	int stack = inferior_registers.r_reg[SP_REGNUM];
254	int stuff = ptrace (PTRACE_PEEKDATA, inferior_pid,
255	(PTRACE_ARG3_TYPE) stack);
256	int reg = inferior_registers.r_reg[EAX];
257	inferior_registers.r_reg[EAX] =
258	inferior_registers.r_reg[FP_REGNUM];
259	ptrace (PTRACE_SETREGS, inferior_pid,
260	(PTRACE_ARG3_TYPE) &inferior_registers);
261	ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack,
262	0xc589);
263	ptrace (PTRACE_SINGLESTEP, inferior_pid, (PTRACE_ARG3_TYPE) stack,
264	0);
265	wait (0);
266	ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack,
267	stuff);
268	inferior_registers.r_reg[EAX] = reg;
269	}
270	#endif
271	ptrace (PTRACE_SETREGS, inferior_pid,
272	(PTRACE_ARG3_TYPE) &inferior_registers);
273	ptrace (PTRACE_SETFPREGS, inferior_pid,
274	(PTRACE_ARG3_TYPE) &inferior_fp_registers);
275	}
276