[deliverable/binutils-gdb.git] / gdb / sparc-xdep.c

/* Machine-dependent code which would otherwise be in inflow.c and core.c,
   for GDB, the GNU debugger, for SPARC host systems.

   Copyright (C) 1986, 1987, 1989, 1990  Free Software Foundation, Inc.

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 "tm-sparc.h"
#include "param-no-tm.h"
#include "inferior.h"
#include "target.h"

#include <sys/param.h>
#include <sys/file.h>		/* For L_SET */

#include <sys/ptrace.h>
#include <machine/reg.h>

#include "gdbcore.h"
#include <sys/core.h>

extern char register_valid[];

/* Fetch one or more registers from the inferior.  REGNO == -1 to get
   them all.  We actually fetch more than requested, when convenient,
   marking them as valid so we won't fetch them again.  */
void
fetch_inferior_registers (regno)
     int regno;
{
  struct regs inferior_registers;
  struct fp_status inferior_fp_registers;
  int i;

  /* We should never be called with deferred stores, because a prerequisite
     for writing regs is to have fetched them all (PREPARE_TO_STORE), sigh.  */
  if (deferred_stores) abort();

  DO_DEFERRED_STORES;

  /* Global and Out regs are fetched directly, as well as the control
     registers.  If we're getting one of the in or local regs,
     and the stack pointer has not yet been fetched,
     we have to do that first, since they're found in memory relative
     to the stack pointer.  */
  if (regno < O7_REGNUM  /* including -1 */
      || regno >= Y_REGNUM
      || (!register_valid[SP_REGNUM] && regno < I7_REGNUM))
    {
      if (0 != ptrace (PTRACE_GETREGS, inferior_pid, &inferior_registers))
	    perror("ptrace_getregs");
      
      registers[REGISTER_BYTE (0)] = 0;
      bcopy (&inferior_registers.r_g1, &registers[REGISTER_BYTE (1)], 15 * REGISTER_RAW_SIZE (G0_REGNUM));
      *(int *)&registers[REGISTER_BYTE (PS_REGNUM)] = inferior_registers.r_ps; 
      *(int *)&registers[REGISTER_BYTE (PC_REGNUM)] = inferior_registers.r_pc;
      *(int *)&registers[REGISTER_BYTE (NPC_REGNUM)] = inferior_registers.r_npc;
      *(int *)&registers[REGISTER_BYTE (Y_REGNUM)] = inferior_registers.r_y;

      for (i = G0_REGNUM; i <= O7_REGNUM; i++)
	register_valid[i] = 1;
      register_valid[Y_REGNUM] = 1;
      register_valid[PS_REGNUM] = 1;
      register_valid[PC_REGNUM] = 1;
      register_valid[NPC_REGNUM] = 1;
      /* If we don't set these valid, read_register_bytes() rereads
	 all the regs every time it is called!  FIXME.  */
      register_valid[WIM_REGNUM] = 1;	/* Not true yet, FIXME */
      register_valid[TBR_REGNUM] = 1;	/* Not true yet, FIXME */
      register_valid[FPS_REGNUM] = 1;	/* Not true yet, FIXME */
      register_valid[CPS_REGNUM] = 1;	/* Not true yet, FIXME */
    }

  /* Floating point registers */
  if (regno == -1 || (regno >= FP0_REGNUM && regno <= FP0_REGNUM + 31))
    {
      if (0 != ptrace (PTRACE_GETFPREGS, inferior_pid, &inferior_fp_registers))
	    perror("ptrace_getfpregs");
      bcopy (&inferior_fp_registers, &registers[REGISTER_BYTE (FP0_REGNUM)],
	     sizeof inferior_fp_registers.fpu_fr);
      /* bcopy (&inferior_fp_registers.Fpu_fsr,
	     &registers[REGISTER_BYTE (FPS_REGNUM)],
	     sizeof (FPU_FSR_TYPE));  FIXME???  -- gnu@cyg */
      for (i = FP0_REGNUM; i <= FP0_REGNUM+31; i++)
	register_valid[i] = 1;
      register_valid[FPS_REGNUM] = 1;
    }

  /* These regs are saved on the stack by the kernel.  Only read them
     all (16 ptrace calls!) if we really need them.  */
  if (regno == -1)
    {
      target_xfer_memory (*(CORE_ADDR*)&registers[REGISTER_BYTE (SP_REGNUM)],
		          &registers[REGISTER_BYTE (L0_REGNUM)],
			  16*REGISTER_RAW_SIZE (L0_REGNUM), 0);
      for (i = L0_REGNUM; i <= I7_REGNUM; i++)
	register_valid[i] = 1;
    }
  else if (regno >= L0_REGNUM && regno <= I7_REGNUM)
    {
      CORE_ADDR sp = *(CORE_ADDR*)&registers[REGISTER_BYTE (SP_REGNUM)];
      i = REGISTER_BYTE (regno);
      if (register_valid[regno])
	printf("register %d valid and read\n", regno);
      target_xfer_memory (sp + i - REGISTER_BYTE (L0_REGNUM),
			  &registers[i], REGISTER_RAW_SIZE (regno), 0);
      register_valid[regno] = 1;
    }
}

/* 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).  */

#define	INT_REGS	1
#define	STACK_REGS	2
#define	FP_REGS		4
int deferred_stores = 0;	/* Cumulates stores we want to do eventually. */

int
store_inferior_registers (regno)
     int regno;
{
  struct regs inferior_registers;
  struct fp_status inferior_fp_registers;
  int wanna_store = INT_REGS + STACK_REGS + FP_REGS;

  /* First decide which pieces of machine-state we need to modify.  
     Default for regno == -1 case is all pieces.  */
  if (regno >= 0)
    if (FP0_REGNUM <= regno && regno < FP0_REGNUM + 32)
      {
	wanna_store = FP_REGS;
      }
    else 
      {
	if (regno == SP_REGNUM)
	  wanna_store = INT_REGS + STACK_REGS;
	else if (regno < L0_REGNUM || regno > I7_REGNUM)
	  wanna_store = INT_REGS;
	else
	  wanna_store = STACK_REGS;
      }

  /* See if we're forcing the stores to happen now, or deferring. */
  if (regno == -2)
    {
      wanna_store = deferred_stores;
      deferred_stores = 0;
    }
  else
    {
      if (wanna_store == STACK_REGS)
	{
	  /* Fall through and just store one stack reg.  If we deferred
	     it, we'd have to store them all, or remember more info.  */
	}
      else
	{
	  deferred_stores |= wanna_store;
	  return 0;
	}
    }

  if (wanna_store & STACK_REGS)
    {
      CORE_ADDR sp = *(CORE_ADDR *)&registers[REGISTER_BYTE (SP_REGNUM)];

      if (regno < 0 || regno == SP_REGNUM)
	{
	  if (!register_valid[L0_REGNUM+5]) abort();
	  target_xfer_memory (sp, 
			      &registers[REGISTER_BYTE (L0_REGNUM)],
			      16*REGISTER_RAW_SIZE (L0_REGNUM), 1);
	}
      else
	{
	  if (!register_valid[regno]) abort();
	  target_xfer_memory (sp + REGISTER_BYTE (regno) - REGISTER_BYTE (L0_REGNUM),
			      &registers[REGISTER_BYTE (regno)],
			      REGISTER_RAW_SIZE (regno), 1);
	}
	
    }

  if (wanna_store & INT_REGS)
    {
      if (!register_valid[G1_REGNUM]) abort();

      bcopy (&registers[REGISTER_BYTE (G1_REGNUM)],
	     &inferior_registers.r_g1, 15 * REGISTER_RAW_SIZE (G1_REGNUM));

      inferior_registers.r_ps =
	*(int *)&registers[REGISTER_BYTE (PS_REGNUM)];
      inferior_registers.r_pc =
	*(int *)&registers[REGISTER_BYTE (PC_REGNUM)];
      inferior_registers.r_npc =
	*(int *)&registers[REGISTER_BYTE (NPC_REGNUM)];
      inferior_registers.r_y =
	*(int *)&registers[REGISTER_BYTE (Y_REGNUM)];

      if (0 != ptrace (PTRACE_SETREGS, inferior_pid, &inferior_registers))
	perror("ptrace_setregs");
    }

  if (wanna_store & FP_REGS)
    {
      if (!register_valid[FP0_REGNUM+9]) abort();
      bcopy (&registers[REGISTER_BYTE (FP0_REGNUM)],
	     &inferior_fp_registers,
	     sizeof inferior_fp_registers.fpu_fr);

/*      bcopy (&registers[REGISTER_BYTE (FPS_REGNUM)],
	     &inferior_fp_registers.Fpu_fsr,
	     sizeof (FPU_FSR_TYPE));
****/
      if (0 !=
	 ptrace (PTRACE_SETFPREGS, inferior_pid, &inferior_fp_registers))
	 perror("ptrace_setfpregs");
    }
    return 0;
}
\f
void
fetch_core_registers (core_reg_sect, core_reg_size, which)
  char *core_reg_sect;
  unsigned core_reg_size;
  int which;
{

  if (which == 0) {

    /* Integer registers */

#define gregs ((struct regs *)core_reg_sect)
    /* G0 *always* holds 0.  */
    *(int *)&registers[REGISTER_BYTE (0)] = 0;

    /* The globals and output registers.  */
    bcopy (&gregs->r_g1, 
	   &registers[REGISTER_BYTE (G1_REGNUM)],
	   15 * REGISTER_RAW_SIZE (G1_REGNUM));
    *(int *)&registers[REGISTER_BYTE (PS_REGNUM)] = gregs->r_ps;
    *(int *)&registers[REGISTER_BYTE (PC_REGNUM)] = gregs->r_pc;
    *(int *)&registers[REGISTER_BYTE (NPC_REGNUM)] = gregs->r_npc;
    *(int *)&registers[REGISTER_BYTE (Y_REGNUM)] = gregs->r_y;

    /* My best guess at where to get the locals and input
       registers is exactly where they usually are, right above
       the stack pointer.  If the core dump was caused by a bus error
       from blowing away the stack pointer (as is possible) then this
       won't work, but it's worth the try. */
    {
      int sp;

      sp = *(int *)&registers[REGISTER_BYTE (SP_REGNUM)];
      if (0 != target_read_memory (sp, &registers[REGISTER_BYTE (L0_REGNUM)], 
			  16 * REGISTER_RAW_SIZE (L0_REGNUM)))
	{
	  /* fprintf so user can still use gdb */
	  fprintf (stderr,
		   "Couldn't read input and local registers from core file\n");
	}
    }
  } else if (which == 2) {

    /* Floating point registers */

#define fpuregs  ((struct fpu *) core_reg_sect)
    if (core_reg_size >= sizeof (struct fpu))
      {
	bcopy (fpuregs->fpu_regs,
	       &registers[REGISTER_BYTE (FP0_REGNUM)],
	       sizeof (fpuregs->fpu_regs));
	bcopy (&fpuregs->fpu_fsr,
	       &registers[REGISTER_BYTE (FPS_REGNUM)],
	       sizeof (FPU_FSR_TYPE));
      }
    else
      fprintf (stderr, "Couldn't read float regs from core file\n");
  }
}
Commit	Line	Data
dd3b648e RP	1	/* Machine-dependent code which would otherwise be in inflow.c and core.c,
	2	for GDB, the GNU debugger, for SPARC host systems.
	3
	4	Copyright (C) 1986, 1987, 1989, 1990 Free Software Foundation, Inc.
	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 "tm-sparc.h"
	25	#include "param-no-tm.h"
	26	#include "inferior.h"
	27	#include "target.h"
	28
	29	#include <sys/param.h>
	30	#include <sys/file.h> /* For L_SET */
	31
	32	#include <sys/ptrace.h>
	33	#include <machine/reg.h>
	34
	35	#include "gdbcore.h"
	36	#include <sys/core.h>
	37
	38	extern char register_valid[];
	39
	40	/* Fetch one or more registers from the inferior. REGNO == -1 to get
	41	them all. We actually fetch more than requested, when convenient,
	42	marking them as valid so we won't fetch them again. */
	43	void
	44	fetch_inferior_registers (regno)
	45	int regno;
	46	{
	47	struct regs inferior_registers;
	48	struct fp_status inferior_fp_registers;
	49	int i;
	50
	51	/* We should never be called with deferred stores, because a prerequisite
	52	for writing regs is to have fetched them all (PREPARE_TO_STORE), sigh. */
	53	if (deferred_stores) abort();
	54
	55	DO_DEFERRED_STORES;
	56
	57	/* Global and Out regs are fetched directly, as well as the control
	58	registers. If we're getting one of the in or local regs,
	59	and the stack pointer has not yet been fetched,
	60	we have to do that first, since they're found in memory relative
	61	to the stack pointer. */
	62	if (regno < O7_REGNUM /* including -1 */
	63	\|\| regno >= Y_REGNUM
	64	\|\| (!register_valid[SP_REGNUM] && regno < I7_REGNUM))
65	{
66	if (0 != ptrace (PTRACE_GETREGS, inferior_pid, &inferior_registers))
67	perror("ptrace_getregs");
68
69	registers[REGISTER_BYTE (0)] = 0;
70	bcopy (&inferior_registers.r_g1, &registers[REGISTER_BYTE (1)], 15 * REGISTER_RAW_SIZE (G0_REGNUM));
71	(int )&registers[REGISTER_BYTE (PS_REGNUM)] = inferior_registers.r_ps;
72	(int )&registers[REGISTER_BYTE (PC_REGNUM)] = inferior_registers.r_pc;
73	(int )&registers[REGISTER_BYTE (NPC_REGNUM)] = inferior_registers.r_npc;
74	(int )&registers[REGISTER_BYTE (Y_REGNUM)] = inferior_registers.r_y;
75
76	for (i = G0_REGNUM; i <= O7_REGNUM; i++)
77	register_valid[i] = 1;
78	register_valid[Y_REGNUM] = 1;
79	register_valid[PS_REGNUM] = 1;
80	register_valid[PC_REGNUM] = 1;
81	register_valid[NPC_REGNUM] = 1;
82	/* If we don't set these valid, read_register_bytes() rereads
83	all the regs every time it is called! FIXME. */
84	register_valid[WIM_REGNUM] = 1; /* Not true yet, FIXME */
85	register_valid[TBR_REGNUM] = 1; /* Not true yet, FIXME */
86	register_valid[FPS_REGNUM] = 1; /* Not true yet, FIXME */
87	register_valid[CPS_REGNUM] = 1; /* Not true yet, FIXME */
88	}
89
90	/* Floating point registers */
91	if (regno == -1 \|\| (regno >= FP0_REGNUM && regno <= FP0_REGNUM + 31))
92	{
93	if (0 != ptrace (PTRACE_GETFPREGS, inferior_pid, &inferior_fp_registers))
94	perror("ptrace_getfpregs");
95	bcopy (&inferior_fp_registers, &registers[REGISTER_BYTE (FP0_REGNUM)],
96	sizeof inferior_fp_registers.fpu_fr);
97	/* bcopy (&inferior_fp_registers.Fpu_fsr,
98	&registers[REGISTER_BYTE (FPS_REGNUM)],
99	sizeof (FPU_FSR_TYPE)); FIXME??? -- gnu@cyg */
100	for (i = FP0_REGNUM; i <= FP0_REGNUM+31; i++)
101	register_valid[i] = 1;
102	register_valid[FPS_REGNUM] = 1;
103	}
104
105	/* These regs are saved on the stack by the kernel. Only read them
106	all (16 ptrace calls!) if we really need them. */
107	if (regno == -1)
108	{
109	target_xfer_memory ((CORE_ADDR)&registers[REGISTER_BYTE (SP_REGNUM)],
110	&registers[REGISTER_BYTE (L0_REGNUM)],
111	16*REGISTER_RAW_SIZE (L0_REGNUM), 0);
112	for (i = L0_REGNUM; i <= I7_REGNUM; i++)
113	register_valid[i] = 1;
114	}
115	else if (regno >= L0_REGNUM && regno <= I7_REGNUM)
116	{
117	CORE_ADDR sp = (CORE_ADDR)&registers[REGISTER_BYTE (SP_REGNUM)];
118	i = REGISTER_BYTE (regno);
119	if (register_valid[regno])
120	printf("register %d valid and read\n", regno);
121	target_xfer_memory (sp + i - REGISTER_BYTE (L0_REGNUM),
122	&registers[i], REGISTER_RAW_SIZE (regno), 0);
123	register_valid[regno] = 1;
124	}
125	}
126
127	/* Store our register values back into the inferior.
128	If REGNO is -1, do this for all registers.
129	Otherwise, REGNO specifies which register (so we can save time). */
130
131	#define INT_REGS 1
132	#define STACK_REGS 2
133	#define FP_REGS 4
134	int deferred_stores = 0; /* Cumulates stores we want to do eventually. */
135
136	int
137	store_inferior_registers (regno)
138	int regno;
139	{
140	struct regs inferior_registers;
141	struct fp_status inferior_fp_registers;
142	int wanna_store = INT_REGS + STACK_REGS + FP_REGS;
143
144	/* First decide which pieces of machine-state we need to modify.
145	Default for regno == -1 case is all pieces. */
146	if (regno >= 0)
147	if (FP0_REGNUM <= regno && regno < FP0_REGNUM + 32)
148	{
149	wanna_store = FP_REGS;
150	}
151	else
152	{
153	if (regno == SP_REGNUM)
154	wanna_store = INT_REGS + STACK_REGS;
155	else if (regno < L0_REGNUM \|\| regno > I7_REGNUM)
156	wanna_store = INT_REGS;
157	else
158	wanna_store = STACK_REGS;
159	}
160
161	/* See if we're forcing the stores to happen now, or deferring. */
162	if (regno == -2)
163	{
164	wanna_store = deferred_stores;
165	deferred_stores = 0;
166	}
167	else
168	{
169	if (wanna_store == STACK_REGS)
170	{
171	/* Fall through and just store one stack reg. If we deferred
172	it, we'd have to store them all, or remember more info. */
173	}
174	else
175	{
176	deferred_stores \|= wanna_store;
177	return 0;
178	}
179	}
180
181	if (wanna_store & STACK_REGS)
182	{
183	CORE_ADDR sp = (CORE_ADDR )&registers[REGISTER_BYTE (SP_REGNUM)];
184
185	if (regno < 0 \|\| regno == SP_REGNUM)
186	{
187	if (!register_valid[L0_REGNUM+5]) abort();
188	target_xfer_memory (sp,
189	&registers[REGISTER_BYTE (L0_REGNUM)],
190	16*REGISTER_RAW_SIZE (L0_REGNUM), 1);
191	}
192	else
193	{
194	if (!register_valid[regno]) abort();
195	target_xfer_memory (sp + REGISTER_BYTE (regno) - REGISTER_BYTE (L0_REGNUM),
196	&registers[REGISTER_BYTE (regno)],
197	REGISTER_RAW_SIZE (regno), 1);
198	}
199
200	}
201
202	if (wanna_store & INT_REGS)
203	{
204	if (!register_valid[G1_REGNUM]) abort();
205
206	bcopy (&registers[REGISTER_BYTE (G1_REGNUM)],
207	&inferior_registers.r_g1, 15 * REGISTER_RAW_SIZE (G1_REGNUM));
208
209	inferior_registers.r_ps =
210	(int )&registers[REGISTER_BYTE (PS_REGNUM)];
211	inferior_registers.r_pc =
212	(int )&registers[REGISTER_BYTE (PC_REGNUM)];
213	inferior_registers.r_npc =
214	(int )&registers[REGISTER_BYTE (NPC_REGNUM)];
215	inferior_registers.r_y =
216	(int )&registers[REGISTER_BYTE (Y_REGNUM)];
217
218	if (0 != ptrace (PTRACE_SETREGS, inferior_pid, &inferior_registers))
219	perror("ptrace_setregs");
220	}
221
222	if (wanna_store & FP_REGS)
223	{
224	if (!register_valid[FP0_REGNUM+9]) abort();
225	bcopy (&registers[REGISTER_BYTE (FP0_REGNUM)],
226	&inferior_fp_registers,
227	sizeof inferior_fp_registers.fpu_fr);
228
229	/* bcopy (&registers[REGISTER_BYTE (FPS_REGNUM)],
230	&inferior_fp_registers.Fpu_fsr,
231	sizeof (FPU_FSR_TYPE));
232	****/
233	if (0 !=
234	ptrace (PTRACE_SETFPREGS, inferior_pid, &inferior_fp_registers))
235	perror("ptrace_setfpregs");
236	}
237	return 0;
238	}
239	\f
240	void
241	fetch_core_registers (core_reg_sect, core_reg_size, which)
242	char *core_reg_sect;
243	unsigned core_reg_size;
244	int which;
245	{
246
247	if (which == 0) {
248
249	/* Integer registers */
250
251	#define gregs ((struct regs *)core_reg_sect)
252	/* G0 always holds 0. */
253	(int )&registers[REGISTER_BYTE (0)] = 0;
254
255	/* The globals and output registers. */
256	bcopy (&gregs->r_g1,
257	&registers[REGISTER_BYTE (G1_REGNUM)],
258	15 * REGISTER_RAW_SIZE (G1_REGNUM));
259	(int )&registers[REGISTER_BYTE (PS_REGNUM)] = gregs->r_ps;
260	(int )&registers[REGISTER_BYTE (PC_REGNUM)] = gregs->r_pc;
261	(int )&registers[REGISTER_BYTE (NPC_REGNUM)] = gregs->r_npc;
262	(int )&registers[REGISTER_BYTE (Y_REGNUM)] = gregs->r_y;
263
264	/* My best guess at where to get the locals and input
265	registers is exactly where they usually are, right above
266	the stack pointer. If the core dump was caused by a bus error
267	from blowing away the stack pointer (as is possible) then this
268	won't work, but it's worth the try. */
269	{
270	int sp;
271
272	sp = (int )&registers[REGISTER_BYTE (SP_REGNUM)];
273	if (0 != target_read_memory (sp, &registers[REGISTER_BYTE (L0_REGNUM)],
274	16 * REGISTER_RAW_SIZE (L0_REGNUM)))
275	{
276	/* fprintf so user can still use gdb */
277	fprintf (stderr,
278	"Couldn't read input and local registers from core file\n");
279	}
280	}
281	} else if (which == 2) {
282
283	/* Floating point registers */
284
285	#define fpuregs ((struct fpu *) core_reg_sect)
286	if (core_reg_size >= sizeof (struct fpu))
287	{
288	bcopy (fpuregs->fpu_regs,
289	&registers[REGISTER_BYTE (FP0_REGNUM)],
290	sizeof (fpuregs->fpu_regs));
291	bcopy (&fpuregs->fpu_fsr,
292	&registers[REGISTER_BYTE (FPS_REGNUM)],
293	sizeof (FPU_FSR_TYPE));
294	}
295	else
296	fprintf (stderr, "Couldn't read float regs from core file\n");
297	}
298	}