[binutils.git] / gdb / pyr-xdep.c

/* Low level Pyramid interface to ptrace, for GDB when running under Unix.
   Copyright (C) 1988, 1989, 1991 Free Software Foundation, Inc.

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.  */

#include "defs.h"
#include "frame.h"
#include "inferior.h"

#include <sys/param.h>
#include <sys/dir.h>
#include <signal.h>
#include <sys/ioctl.h>
/* #include <fcntl.h>  Can we live without this?  */

#include "gdbcore.h"
#include <sys/user.h>		/* After a.out.h  */
#include <sys/file.h>
#include <sys/stat.h>

\f
void
fetch_inferior_registers (regno)
     int regno;
{
  register int datum;
  register unsigned int regaddr;
  int reg_buf[NUM_REGS+1];
  struct user u;
  register int skipped_frames = 0;

  registers_fetched ();
  
  for (regno = 0; regno < 64; regno++) {
    reg_buf[regno] = ptrace (3, inferior_pid, regno, 0);
    
#if defined(PYRAMID_CONTROL_FRAME_DEBUGGING)
    printf ("Fetching %s from inferior, got %0x\n",
	    reg_names[regno],
	    reg_buf[regno]);
#endif /* PYRAMID_CONTROL_FRAME_DEBUGGING */
    
    if (reg_buf[regno] == -1 && errno == EIO) {
      printf("fetch_interior_registers: fetching %s from inferior\n",
	     reg_names[regno]);
      errno = 0;
    }
    supply_register (regno, reg_buf+regno);
  }
  /* that leaves regs 64, 65, and 66 */
  datum = ptrace (3, inferior_pid,
		  ((char *)&u.u_pcb.pcb_csp) -
		  ((char *)&u), 0);
  
  
  /* FIXME: Find the Current Frame Pointer (CFP). CFP is a global
     register (ie, NOT windowed), that gets saved in a frame iff
     the code for that frame has a prologue (ie, "adsf N").  If
     there is a prologue, the adsf insn saves the old cfp in
     pr13, cfp is set to sp, and N bytes of locals are allocated
     (sp is decremented by n).
     This makes finding CFP hard. I guess the right way to do it
     is: 
     - If this is the innermost frame, believe ptrace() or
     the core area.
     - Otherwise:
     Find the first insn of the current frame.
     - find the saved pc;
     - find the call insn that saved it;
     - figure out where the call is to;
     - if the first insn is an adsf, we got a frame
     pointer. */
  
  
  /* Normal processors have separate stack pointers for user and
     kernel mode. Getting the last user mode frame on such
     machines is easy: the kernel context of the ptrace()'d
     process is on the kernel stack, and the USP points to what
     we want. But Pyramids only have a single cfp for both user and
     kernel mode.  And processes being ptrace()'d have some
     kernel-context control frames on their stack.
     To avoid tracing back into the kernel context of an inferior,
     we skip 0 or more contiguous control frames where the pc is
     in the kernel. */ 
  
  while (1) {
    register int inferior_saved_pc;
    inferior_saved_pc = ptrace (1, inferior_pid, datum+((32+15)*4), 0);
    if (inferior_saved_pc > 0) break;
#if defined(PYRAMID_CONTROL_FRAME_DEBUGGING)
    printf("skipping kernel frame %08x, pc=%08x\n", datum,
	   inferior_saved_pc);
#endif /* PYRAMID_CONTROL_FRAME_DEBUGGING */
    skipped_frames++;
    datum -= CONTROL_STACK_FRAME_SIZE;
  }
  
  reg_buf[CSP_REGNUM] = datum;
  supply_register(CSP_REGNUM, reg_buf+CSP_REGNUM);
#ifdef  PYRAMID_CONTROL_FRAME_DEBUGGING
  if (skipped_frames) {
    fprintf (stderr,
	     "skipped %d frames from %x to %x; cfp was %x, now %x\n",
	     skipped_frames, reg_buf[CSP_REGNUM]);
  }
#endif /* PYRAMID_CONTROL_FRAME_DEBUGGING */
}

/* 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;
{
  register unsigned int regaddr;
  char buf[80];

  if (regno >= 0)
    {
      if ((0 <= regno) && (regno < 64)) {
	/*regaddr = register_addr (regno, offset);*/
	regaddr = regno;
	errno = 0;
	ptrace (6, inferior_pid, regaddr, read_register (regno));
	if (errno != 0)
	  {
	    sprintf (buf, "writing register number %d", regno);
	    perror_with_name (buf);
	  }
      }
    }
  else
    {
      for (regno = 0; regno < NUM_REGS; regno++)
	{
	  /*regaddr = register_addr (regno, offset);*/
	  regaddr = regno;
	  errno = 0;
	  ptrace (6, inferior_pid, regaddr, read_register (regno));
	  if (errno != 0)
	    {
	      sprintf (buf, "writing all regs, number %d", regno);
	      perror_with_name (buf);
	    }
	}
}
\f
/*** Extensions to  core and dump files, for GDB. */

extern unsigned int last_frame_offset;

#ifdef PYRAMID_CORE

/* Can't make definitions here static, since core.c needs them
   to do bounds checking on the core-file areas. O well. */

/* have two stacks: one for data, one for register windows. */
extern CORE_ADDR reg_stack_start;
extern CORE_ADDR reg_stack_end;

/* need this so we can find the global registers: they never get saved. */
CORE_ADDR global_reg_offset;
static CORE_ADDR last_frame_address;
CORE_ADDR last_frame_offset;


/* Address in core file of start of register window stack area.
   Don't know if is this any of meaningful, useful or necessary.   */
extern int reg_stack_offset;

#endif /* PYRAMID_CORE */  

\f
/* Work with core dump and executable files, for GDB. 
   This code would be in core.c if it weren't machine-dependent. */

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;

#ifdef PYRAMID_CORE
  reg_stack_start = CONTROL_STACK_ADDR;
  reg_stack_end = CONTROL_STACK_ADDR;	/* this isn't strictly true...*/
#endif /* PYRAMID_CORE */

  /* 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);
      /* 4.2-style (and perhaps also sysV-style) core dump file.  */
      {
	struct user u;

	unsigned int reg_offset;

	val = myread (corechan, &u, sizeof u);
	if (val < 0)
	  perror_with_name ("Not a core file: reading upage");
	if (val != sizeof u)
	  error ("Not a core file: could only read %d bytes", val);
	data_start = exec_data_start;

	data_end = data_start + NBPG * u.u_dsize;
	data_offset = NBPG * UPAGES;
	stack_offset = NBPG * (UPAGES + u.u_dsize);

	/* find registers in core file */
#ifdef PYRAMID_PTRACE
	stack_start = stack_end - NBPG * u.u_ussize;
	reg_stack_offset = stack_offset + (NBPG *u.u_ussize);
	reg_stack_end = reg_stack_start + NBPG * u.u_cssize;

	last_frame_address = ((int) u.u_pcb.pcb_csp);
	last_frame_offset = reg_stack_offset + last_frame_address
		- CONTROL_STACK_ADDR ;
	global_reg_offset = (char *)&u - (char *)&u.u_pcb.pcb_gr0 ;

	/* skip any control-stack frames that were executed in the
	   kernel. */

	while (1) {
	    char buf[4];
	    val = lseek (corechan, last_frame_offset+(47*4), 0);
	    if (val < 0)
		    perror_with_name (filename);
	    val = myread (corechan, buf, sizeof buf);
	    if (val < 0)
		    perror_with_name (filename);

	    if (*(int *)buf >= 0)
		    break;
	    printf ("skipping frame %s\n", local_hex_string (last_frame_address));
	    last_frame_offset -= CONTROL_STACK_FRAME_SIZE;
	    last_frame_address -= CONTROL_STACK_FRAME_SIZE;
	}
	reg_offset = last_frame_offset;

#if 1 || defined(PYRAMID_CONTROL_FRAME_DEBUGGING)
	printf ("Control stack pointer = %s\n",
		local_hex_string (u.u_pcb.pcb_csp));
	printf ("offset to control stack %d outermost frame %d (%s)\n",
	      reg_stack_offset, reg_offset, local_hex_string (last_frame_address));
#endif /* PYRAMID_CONTROL_FRAME_DEBUGGING */

#else /* not PYRAMID_CORE */
	stack_start = stack_end - NBPG * u.u_ssize;
        reg_offset = (int) u.u_ar0 - KERNEL_U_ADDR;
#endif /* not PYRAMID_CORE */

#ifdef __not_on_pyr_yet
	/* Some machines put an absolute address in here and some put
	   the offset in the upage of the regs.  */
	reg_offset = (int) u.u_ar0;
	if (reg_offset > NBPG * UPAGES)
	  reg_offset -= KERNEL_U_ADDR;
#endif

	/* I don't know where to find this info.
	   So, for now, mark it as not available.  */
	N_SET_MAGIC (core_aouthdr, 0);

	/* Read the register values out of the core file and store
	   them where `read_register' will find them.  */

	{
	  register int regno;

	  for (regno = 0; regno < 64; regno++)
	    {
	      char buf[MAX_REGISTER_RAW_SIZE];

	      val = lseek (corechan, register_addr (regno, reg_offset), 0);
	      if (val < 0
		  || (val = myread (corechan, buf, sizeof buf)) < 0)
		{
		  char * buffer = (char *) alloca (strlen (reg_names[regno])
						   + 30);
		  strcpy (buffer, "Reading register ");
		  strcat (buffer, reg_names[regno]);
						   
		  perror_with_name (buffer);
		}

	      if (val < 0)
		perror_with_name (filename);
#ifdef PYRAMID_CONTROL_FRAME_DEBUGGING
      printf ("[reg %s(%d), offset in file %s=0x%0x, addr =0x%0x, =%0x]\n",
	      reg_names[regno], regno, filename,
	      register_addr(regno, reg_offset),
	      regno * 4 + last_frame_address,
	      *((int *)buf));
#endif /* PYRAMID_CONTROL_FRAME_DEBUGGING */
	      supply_register (regno, buf);
	    }
	}
      }
      if (filename[0] == '/')
	corefile = savestring (filename, strlen (filename));
      else
	{
	  corefile = concat (current_directory, "/", filename, NULL);
	}

#if 1 || defined(PYRAMID_CONTROL_FRAME_DEBUGGING)
      printf ("Providing CSP (%s) as nominal address of current frame.\n",
	      local_hex_string(last_frame_address));
#endif PYRAMID_CONTROL_FRAME_DEBUGGING
      /* FIXME: Which of the following is correct? */
#if 0
      set_current_frame ( create_new_frame (read_register (FP_REGNUM),
					    read_pc ()));
#else
      set_current_frame ( create_new_frame (last_frame_address,
					    read_pc ()));
#endif

      select_frame (get_current_frame (), 0);
      validate_files ();
    }
  else if (from_tty)
    printf ("No core file now.\n");
}
Commit	Line	Data
dd3b648e RP	1	/* Low level Pyramid interface to ptrace, for GDB when running under Unix.
	2	Copyright (C) 1988, 1989, 1991 Free Software Foundation, Inc.
	3
	4	This file is part of GDB.
	5
99a7de40	6	This program is free software; you can redistribute it and/or modify
dd3b648e	7	it under the terms of the GNU General Public License as published by
99a7de40 JG	8	the Free Software Foundation; either version 2 of the License, or
99a7de40 JG	9	(at your option) any later version.
dd3b648e	10
99a7de40	11	This program is distributed in the hope that it will be useful,
dd3b648e RP	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	GNU General Public License for more details.
	15
	16	You should have received a copy of the GNU General Public License
99a7de40 JG	17	along with this program; if not, write to the Free Software
99a7de40 JG	18	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
dd3b648e	19
dd3b648e	20	#include "defs.h"
dd3b648e RP	21	#include "frame.h"
	22	#include "inferior.h"
	23
	24	#include <sys/param.h>
	25	#include <sys/dir.h>
	26	#include <signal.h>
	27	#include <sys/ioctl.h>
	28	/* #include <fcntl.h> Can we live without this? */
	29
	30	#include "gdbcore.h"
	31	#include <sys/user.h> /* After a.out.h */
	32	#include <sys/file.h>
	33	#include <sys/stat.h>
1ab3bf1b	34
dd3b648e RP	35	\f
dd3b648e RP	36	void
1ab3bf1b JG	37	fetch_inferior_registers (regno)
1ab3bf1b JG	38	int regno;
dd3b648e	39	{
1ab3bf1b	40	register int datum;
dd3b648e RP	41	register unsigned int regaddr;
	42	int reg_buf[NUM_REGS+1];
	43	struct user u;
	44	register int skipped_frames = 0;
	45
	46	registers_fetched ();
	47
	48	for (regno = 0; regno < 64; regno++) {
	49	reg_buf[regno] = ptrace (3, inferior_pid, regno, 0);
	50
	51	#if defined(PYRAMID_CONTROL_FRAME_DEBUGGING)
	52	printf ("Fetching %s from inferior, got %0x\n",
	53	reg_names[regno],
	54	reg_buf[regno]);
	55	#endif /* PYRAMID_CONTROL_FRAME_DEBUGGING */
	56
	57	if (reg_buf[regno] == -1 && errno == EIO) {
	58	printf("fetch_interior_registers: fetching %s from inferior\n",
	59	reg_names[regno]);
	60	errno = 0;
	61	}
	62	supply_register (regno, reg_buf+regno);
	63	}
	64	/* that leaves regs 64, 65, and 66 */
	65	datum = ptrace (3, inferior_pid,
	66	((char *)&u.u_pcb.pcb_csp) -
	67	((char *)&u), 0);
	68
	69
	70
	71	/* FIXME: Find the Current Frame Pointer (CFP). CFP is a global
	72	register (ie, NOT windowed), that gets saved in a frame iff
	73	the code for that frame has a prologue (ie, "adsf N"). If
	74	there is a prologue, the adsf insn saves the old cfp in
	75	pr13, cfp is set to sp, and N bytes of locals are allocated
	76	(sp is decremented by n).
	77	This makes finding CFP hard. I guess the right way to do it
	78	is:
	79	- If this is the innermost frame, believe ptrace() or
	80	the core area.
	81	- Otherwise:
	82	Find the first insn of the current frame.
	83	- find the saved pc;
	84	- find the call insn that saved it;
	85	- figure out where the call is to;
	86	- if the first insn is an adsf, we got a frame
	87	pointer. */
	88
	89
	90	/* Normal processors have separate stack pointers for user and
	91	kernel mode. Getting the last user mode frame on such
	92	machines is easy: the kernel context of the ptrace()'d
	93	process is on the kernel stack, and the USP points to what
	94	we want. But Pyramids only have a single cfp for both user and
	95	kernel mode. And processes being ptrace()'d have some
	96	kernel-context control frames on their stack.
	97	To avoid tracing back into the kernel context of an inferior,
	98	we skip 0 or more contiguous control frames where the pc is
	99	in the kernel. */
	100
	101	while (1) {
	102	register int inferior_saved_pc;
	103	inferior_saved_pc = ptrace (1, inferior_pid, datum+((32+15)*4), 0);
	104	if (inferior_saved_pc > 0) break;
105	#if defined(PYRAMID_CONTROL_FRAME_DEBUGGING)
106	printf("skipping kernel frame %08x, pc=%08x\n", datum,
107	inferior_saved_pc);
108	#endif /* PYRAMID_CONTROL_FRAME_DEBUGGING */
109	skipped_frames++;
110	datum -= CONTROL_STACK_FRAME_SIZE;
111	}
112
113	reg_buf[CSP_REGNUM] = datum;
114	supply_register(CSP_REGNUM, reg_buf+CSP_REGNUM);
115	#ifdef PYRAMID_CONTROL_FRAME_DEBUGGING
116	if (skipped_frames) {
117	fprintf (stderr,
118	"skipped %d frames from %x to %x; cfp was %x, now %x\n",
119	skipped_frames, reg_buf[CSP_REGNUM]);
120	}
121	#endif /* PYRAMID_CONTROL_FRAME_DEBUGGING */
122	}
123
124	/* Store our register values back into the inferior.
125	If REGNO is -1, do this for all registers.
126	Otherwise, REGNO specifies which register (so we can save time). */
127
1ab3bf1b	128	void
dd3b648e RP	129	store_inferior_registers (regno)
	130	int regno;
	131	{
	132	register unsigned int regaddr;
	133	char buf[80];
	134
	135	if (regno >= 0)
	136	{
	137	if ((0 <= regno) && (regno < 64)) {
	138	/regaddr = register_addr (regno, offset);/
	139	regaddr = regno;
	140	errno = 0;
	141	ptrace (6, inferior_pid, regaddr, read_register (regno));
	142	if (errno != 0)
	143	{
	144	sprintf (buf, "writing register number %d", regno);
	145	perror_with_name (buf);
	146	}
	147	}
	148	}
	149	else
	150	{
	151	for (regno = 0; regno < NUM_REGS; regno++)
	152	{
	153	/regaddr = register_addr (regno, offset);/
	154	regaddr = regno;
	155	errno = 0;
	156	ptrace (6, inferior_pid, regaddr, read_register (regno));
	157	if (errno != 0)
	158	{
	159	sprintf (buf, "writing all regs, number %d", regno);
	160	perror_with_name (buf);
	161	}
	162	}
	163	}
	164	\f
	165	/*** Extensions to core and dump files, for GDB. */
	166
	167	extern unsigned int last_frame_offset;
	168
	169	#ifdef PYRAMID_CORE
	170
	171	/* Can't make definitions here static, since core.c needs them
	172	to do bounds checking on the core-file areas. O well. */
	173
	174	/* have two stacks: one for data, one for register windows. */
	175	extern CORE_ADDR reg_stack_start;
	176	extern CORE_ADDR reg_stack_end;
	177
	178	/* need this so we can find the global registers: they never get saved. */
	179	CORE_ADDR global_reg_offset;
	180	static CORE_ADDR last_frame_address;
	181	CORE_ADDR last_frame_offset;
	182
	183
	184	/* Address in core file of start of register window stack area.
	185	Don't know if is this any of meaningful, useful or necessary. */
	186	extern int reg_stack_offset;
	187
	188	#endif /* PYRAMID_CORE */
	189
	190	\f
	191	/* Work with core dump and executable files, for GDB.
	192	This code would be in core.c if it weren't machine-dependent. */
193
194	void
195	core_file_command (filename, from_tty)
196	char *filename;
197	int from_tty;
198	{
199	int val;
200	extern char registers[];
201
202	/* Discard all vestiges of any previous core file
203	and mark data and stack spaces as empty. */
204
205	if (corefile)
206	free (corefile);
207	corefile = 0;
208
209	if (corechan >= 0)
210	close (corechan);
211	corechan = -1;
212
213	data_start = 0;
214	data_end = 0;
215	stack_start = STACK_END_ADDR;
216	stack_end = STACK_END_ADDR;
217
218	#ifdef PYRAMID_CORE
219	reg_stack_start = CONTROL_STACK_ADDR;
220	reg_stack_end = CONTROL_STACK_ADDR; /* this isn't strictly true...*/
221	#endif /* PYRAMID_CORE */
222
223	/* Now, if a new core file was specified, open it and digest it. */
224
225	if (filename)
226	{
227	filename = tilde_expand (filename);
228	make_cleanup (free, filename);
229
230	if (have_inferior_p ())
231	error ("To look at a core file, you must kill the inferior with \"kill\".");
232	corechan = open (filename, O_RDONLY, 0);
233	if (corechan < 0)
234	perror_with_name (filename);
235	/* 4.2-style (and perhaps also sysV-style) core dump file. */
236	{
237	struct user u;
238
239	unsigned int reg_offset;
240
241	val = myread (corechan, &u, sizeof u);
242	if (val < 0)
243	perror_with_name ("Not a core file: reading upage");
244	if (val != sizeof u)
245	error ("Not a core file: could only read %d bytes", val);
246	data_start = exec_data_start;
247
248	data_end = data_start + NBPG * u.u_dsize;
249	data_offset = NBPG * UPAGES;
250	stack_offset = NBPG * (UPAGES + u.u_dsize);
251
252	/* find registers in core file */
253	#ifdef PYRAMID_PTRACE
254	stack_start = stack_end - NBPG * u.u_ussize;
255	reg_stack_offset = stack_offset + (NBPG *u.u_ussize);
256	reg_stack_end = reg_stack_start + NBPG * u.u_cssize;
257
258	last_frame_address = ((int) u.u_pcb.pcb_csp);
259	last_frame_offset = reg_stack_offset + last_frame_address
260	- CONTROL_STACK_ADDR ;
261	global_reg_offset = (char )&u - (char )&u.u_pcb.pcb_gr0 ;
262
263	/* skip any control-stack frames that were executed in the
264	kernel. */
265
266	while (1) {
267	char buf[4];
268	val = lseek (corechan, last_frame_offset+(47*4), 0);
269	if (val < 0)
270	perror_with_name (filename);
271	val = myread (corechan, buf, sizeof buf);
272	if (val < 0)
273	perror_with_name (filename);
274
275	if ((int )buf >= 0)
276	break;
e3af0493	277	printf ("skipping frame %s\n", local_hex_string (last_frame_address));
dd3b648e RP	278	last_frame_offset -= CONTROL_STACK_FRAME_SIZE;
	279	last_frame_address -= CONTROL_STACK_FRAME_SIZE;
	280	}
	281	reg_offset = last_frame_offset;
	282
	283	#if 1 \|\| defined(PYRAMID_CONTROL_FRAME_DEBUGGING)
e3af0493 JG	284	printf ("Control stack pointer = %s\n",
	285	local_hex_string (u.u_pcb.pcb_csp));
	286	printf ("offset to control stack %d outermost frame %d (%s)\n",
	287	reg_stack_offset, reg_offset, local_hex_string (last_frame_address));
dd3b648e RP	288	#endif /* PYRAMID_CONTROL_FRAME_DEBUGGING */
	289
	290	#else /* not PYRAMID_CORE */
	291	stack_start = stack_end - NBPG * u.u_ssize;
	292	reg_offset = (int) u.u_ar0 - KERNEL_U_ADDR;
	293	#endif /* not PYRAMID_CORE */
	294
	295	#ifdef __not_on_pyr_yet
	296	/* Some machines put an absolute address in here and some put
	297	the offset in the upage of the regs. */
	298	reg_offset = (int) u.u_ar0;
	299	if (reg_offset > NBPG * UPAGES)
	300	reg_offset -= KERNEL_U_ADDR;
	301	#endif
	302
	303	/* I don't know where to find this info.
	304	So, for now, mark it as not available. */
	305	N_SET_MAGIC (core_aouthdr, 0);
	306
	307	/* Read the register values out of the core file and store
	308	them where `read_register' will find them. */
	309
	310	{
	311	register int regno;
	312
	313	for (regno = 0; regno < 64; regno++)
	314	{
	315	char buf[MAX_REGISTER_RAW_SIZE];
	316
	317	val = lseek (corechan, register_addr (regno, reg_offset), 0);
	318	if (val < 0
	319	\|\| (val = myread (corechan, buf, sizeof buf)) < 0)
	320	{
	321	char * buffer = (char *) alloca (strlen (reg_names[regno])
	322	+ 30);
	323	strcpy (buffer, "Reading register ");
	324	strcat (buffer, reg_names[regno]);
	325
	326	perror_with_name (buffer);
	327	}
	328
	329	if (val < 0)
	330	perror_with_name (filename);
	331	#ifdef PYRAMID_CONTROL_FRAME_DEBUGGING
	332	printf ("[reg %s(%d), offset in file %s=0x%0x, addr =0x%0x, =%0x]\n",
	333	reg_names[regno], regno, filename,
	334	register_addr(regno, reg_offset),
	335	regno * 4 + last_frame_address,
	336	((int )buf));
	337	#endif /* PYRAMID_CONTROL_FRAME_DEBUGGING */
	338	supply_register (regno, buf);
	339	}
	340	}
	341	}
	342	if (filename[0] == '/')
	343	corefile = savestring (filename, strlen (filename));
	344	else
	345	{
58ae87f6	346	corefile = concat (current_directory, "/", filename, NULL);
dd3b648e RP	347	}
	348
	349	#if 1 \|\| defined(PYRAMID_CONTROL_FRAME_DEBUGGING)
e3af0493 JG	350	printf ("Providing CSP (%s) as nominal address of current frame.\n",
e3af0493 JG	351	local_hex_string(last_frame_address));
dd3b648e RP	352	#endif PYRAMID_CONTROL_FRAME_DEBUGGING
	353	/* FIXME: Which of the following is correct? */
	354	#if 0
	355	set_current_frame ( create_new_frame (read_register (FP_REGNUM),
	356	read_pc ()));
	357	#else
	358	set_current_frame ( create_new_frame (last_frame_address,
	359	read_pc ()));
	360	#endif
	361
	362	select_frame (get_current_frame (), 0);
	363	validate_files ();
	364	}
	365	else if (from_tty)
	366	printf ("No core file now.\n");
	367	}