[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.

GDB 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 1, or (at your option)
any later version.

GDB 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 GDB; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include <stdio.h>
#include "defs.h"
#include "param.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);
	}

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