[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, (PTRACE_ARG3_TYPE) regno, 0);
    
#if defined(PYRAMID_CONTROL_FRAME_DEBUGGING)
    printf_unfiltered ("Fetching register %s, got %0x\n",
	    reg_names[regno],
	    reg_buf[regno]);
#endif /* PYRAMID_CONTROL_FRAME_DEBUGGING */
    
    if (reg_buf[regno] == -1 && errno == EIO) {
      printf_unfiltered("fetch_interior_registers: fetching register %s\n",
	     reg_names[regno]);
      errno = 0;
    }
    supply_register (regno, reg_buf+regno);
  }
  /* that leaves regs 64, 65, and 66 */
  datum = ptrace (3, inferior_pid,
		  (PTRACE_ARG3_TYPE) (((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,
				(PTRACE_ARG3_TYPE) (datum+((32+15)*4)), 0);
    if (inferior_saved_pc > 0) break;
#if defined(PYRAMID_CONTROL_FRAME_DEBUGGING)
    printf_unfiltered("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_unfiltered (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, (PTRACE_ARG3_TYPE) 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, (PTRACE_ARG3_TYPE) 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 program 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_unfiltered ("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_unfiltered ("Control stack pointer = %s\n",
		local_hex_string (u.u_pcb.pcb_csp));
	printf_unfiltered ("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_unfiltered ("[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_unfiltered ("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_unfiltered ("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++) {
e676a15f	49	reg_buf[regno] = ptrace (3, inferior_pid, (PTRACE_ARG3_TYPE) regno, 0);
dd3b648e RP	50
dd3b648e RP	51	#if defined(PYRAMID_CONTROL_FRAME_DEBUGGING)
199b2450	52	printf_unfiltered ("Fetching register %s, got %0x\n",
dd3b648e RP	53	reg_names[regno],
	54	reg_buf[regno]);
	55	#endif /* PYRAMID_CONTROL_FRAME_DEBUGGING */
	56
	57	if (reg_buf[regno] == -1 && errno == EIO) {
199b2450	58	printf_unfiltered("fetch_interior_registers: fetching register %s\n",
dd3b648e RP	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,
e676a15f FF	66	(PTRACE_ARG3_TYPE) (((char *)&u.u_pcb.pcb_csp) -
e676a15f FF	67	((char *)&u)), 0);
dd3b648e RP	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;
e676a15f FF	103	inferior_saved_pc = ptrace (1, inferior_pid,
e676a15f FF	104	(PTRACE_ARG3_TYPE) (datum+((32+15)*4)), 0);
dd3b648e RP	105	if (inferior_saved_pc > 0) break;
dd3b648e RP	106	#if defined(PYRAMID_CONTROL_FRAME_DEBUGGING)
199b2450	107	printf_unfiltered("skipping kernel frame %08x, pc=%08x\n", datum,
dd3b648e RP	108	inferior_saved_pc);
	109	#endif /* PYRAMID_CONTROL_FRAME_DEBUGGING */
	110	skipped_frames++;
	111	datum -= CONTROL_STACK_FRAME_SIZE;
	112	}
	113
	114	reg_buf[CSP_REGNUM] = datum;
	115	supply_register(CSP_REGNUM, reg_buf+CSP_REGNUM);
	116	#ifdef PYRAMID_CONTROL_FRAME_DEBUGGING
	117	if (skipped_frames) {
199b2450	118	fprintf_unfiltered (stderr,
dd3b648e RP	119	"skipped %d frames from %x to %x; cfp was %x, now %x\n",
	120	skipped_frames, reg_buf[CSP_REGNUM]);
	121	}
	122	#endif /* PYRAMID_CONTROL_FRAME_DEBUGGING */
	123	}
	124
	125	/* Store our register values back into the inferior.
	126	If REGNO is -1, do this for all registers.
	127	Otherwise, REGNO specifies which register (so we can save time). */
	128
1ab3bf1b	129	void
dd3b648e RP	130	store_inferior_registers (regno)
	131	int regno;
	132	{
	133	register unsigned int regaddr;
	134	char buf[80];
	135
	136	if (regno >= 0)
	137	{
	138	if ((0 <= regno) && (regno < 64)) {
	139	/regaddr = register_addr (regno, offset);/
	140	regaddr = regno;
	141	errno = 0;
e676a15f FF	142	ptrace (6, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
e676a15f FF	143	read_register (regno));
dd3b648e RP	144	if (errno != 0)
	145	{
	146	sprintf (buf, "writing register number %d", regno);
	147	perror_with_name (buf);
	148	}
	149	}
	150	}
	151	else
	152	{
	153	for (regno = 0; regno < NUM_REGS; regno++)
	154	{
	155	/regaddr = register_addr (regno, offset);/
	156	regaddr = regno;
	157	errno = 0;
e676a15f FF	158	ptrace (6, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
e676a15f FF	159	read_register (regno));
dd3b648e RP	160	if (errno != 0)
	161	{
	162	sprintf (buf, "writing all regs, number %d", regno);
	163	perror_with_name (buf);
	164	}
	165	}
	166	}
	167	\f
	168	/*** Extensions to core and dump files, for GDB. */
	169
	170	extern unsigned int last_frame_offset;
	171
	172	#ifdef PYRAMID_CORE
	173
	174	/* Can't make definitions here static, since core.c needs them
	175	to do bounds checking on the core-file areas. O well. */
	176
	177	/* have two stacks: one for data, one for register windows. */
	178	extern CORE_ADDR reg_stack_start;
	179	extern CORE_ADDR reg_stack_end;
	180
	181	/* need this so we can find the global registers: they never get saved. */
	182	CORE_ADDR global_reg_offset;
	183	static CORE_ADDR last_frame_address;
	184	CORE_ADDR last_frame_offset;
	185
	186
	187	/* Address in core file of start of register window stack area.
	188	Don't know if is this any of meaningful, useful or necessary. */
	189	extern int reg_stack_offset;
	190
	191	#endif /* PYRAMID_CORE */
	192
	193	\f
	194	/* Work with core dump and executable files, for GDB.
	195	This code would be in core.c if it weren't machine-dependent. */
	196
	197	void
	198	core_file_command (filename, from_tty)
	199	char *filename;
	200	int from_tty;
	201	{
	202	int val;
	203	extern char registers[];
	204
	205	/* Discard all vestiges of any previous core file
	206	and mark data and stack spaces as empty. */
	207
	208	if (corefile)
	209	free (corefile);
	210	corefile = 0;
	211
	212	if (corechan >= 0)
	213	close (corechan);
	214	corechan = -1;
	215
	216	data_start = 0;
	217	data_end = 0;
	218	stack_start = STACK_END_ADDR;
	219	stack_end = STACK_END_ADDR;
	220
	221	#ifdef PYRAMID_CORE
	222	reg_stack_start = CONTROL_STACK_ADDR;
	223	reg_stack_end = CONTROL_STACK_ADDR; /* this isn't strictly true...*/
224	#endif /* PYRAMID_CORE */
225
226	/* Now, if a new core file was specified, open it and digest it. */
227
228	if (filename)
229	{
230	filename = tilde_expand (filename);
231	make_cleanup (free, filename);
232
233	if (have_inferior_p ())
6fe90fc8	234	error ("To look at a core file, you must kill the program with \"kill\".");
dd3b648e RP	235	corechan = open (filename, O_RDONLY, 0);
	236	if (corechan < 0)
	237	perror_with_name (filename);
	238	/* 4.2-style (and perhaps also sysV-style) core dump file. */
	239	{
	240	struct user u;
	241
	242	unsigned int reg_offset;
	243
	244	val = myread (corechan, &u, sizeof u);
	245	if (val < 0)
	246	perror_with_name ("Not a core file: reading upage");
	247	if (val != sizeof u)
	248	error ("Not a core file: could only read %d bytes", val);
	249	data_start = exec_data_start;
	250
	251	data_end = data_start + NBPG * u.u_dsize;
	252	data_offset = NBPG * UPAGES;
	253	stack_offset = NBPG * (UPAGES + u.u_dsize);
	254
	255	/* find registers in core file */
	256	#ifdef PYRAMID_PTRACE
	257	stack_start = stack_end - NBPG * u.u_ussize;
	258	reg_stack_offset = stack_offset + (NBPG *u.u_ussize);
	259	reg_stack_end = reg_stack_start + NBPG * u.u_cssize;
	260
	261	last_frame_address = ((int) u.u_pcb.pcb_csp);
	262	last_frame_offset = reg_stack_offset + last_frame_address
	263	- CONTROL_STACK_ADDR ;
	264	global_reg_offset = (char )&u - (char )&u.u_pcb.pcb_gr0 ;
	265
	266	/* skip any control-stack frames that were executed in the
	267	kernel. */
	268
	269	while (1) {
	270	char buf[4];
	271	val = lseek (corechan, last_frame_offset+(47*4), 0);
	272	if (val < 0)
	273	perror_with_name (filename);
	274	val = myread (corechan, buf, sizeof buf);
	275	if (val < 0)
	276	perror_with_name (filename);
	277
	278	if ((int )buf >= 0)
	279	break;
199b2450	280	printf_unfiltered ("skipping frame %s\n", local_hex_string (last_frame_address));
dd3b648e RP	281	last_frame_offset -= CONTROL_STACK_FRAME_SIZE;
	282	last_frame_address -= CONTROL_STACK_FRAME_SIZE;
	283	}
	284	reg_offset = last_frame_offset;
	285
	286	#if 1 \|\| defined(PYRAMID_CONTROL_FRAME_DEBUGGING)
199b2450	287	printf_unfiltered ("Control stack pointer = %s\n",
e3af0493	288	local_hex_string (u.u_pcb.pcb_csp));
199b2450	289	printf_unfiltered ("offset to control stack %d outermost frame %d (%s)\n",
e3af0493	290	reg_stack_offset, reg_offset, local_hex_string (last_frame_address));
dd3b648e RP	291	#endif /* PYRAMID_CONTROL_FRAME_DEBUGGING */
	292
	293	#else /* not PYRAMID_CORE */
	294	stack_start = stack_end - NBPG * u.u_ssize;
	295	reg_offset = (int) u.u_ar0 - KERNEL_U_ADDR;
	296	#endif /* not PYRAMID_CORE */
	297
	298	#ifdef __not_on_pyr_yet
	299	/* Some machines put an absolute address in here and some put
	300	the offset in the upage of the regs. */
	301	reg_offset = (int) u.u_ar0;
	302	if (reg_offset > NBPG * UPAGES)
	303	reg_offset -= KERNEL_U_ADDR;
	304	#endif
	305
	306	/* I don't know where to find this info.
	307	So, for now, mark it as not available. */
	308	N_SET_MAGIC (core_aouthdr, 0);
	309
	310	/* Read the register values out of the core file and store
	311	them where `read_register' will find them. */
	312
	313	{
	314	register int regno;
	315
	316	for (regno = 0; regno < 64; regno++)
	317	{
	318	char buf[MAX_REGISTER_RAW_SIZE];
	319
	320	val = lseek (corechan, register_addr (regno, reg_offset), 0);
	321	if (val < 0
	322	\|\| (val = myread (corechan, buf, sizeof buf)) < 0)
	323	{
	324	char * buffer = (char *) alloca (strlen (reg_names[regno])
	325	+ 30);
	326	strcpy (buffer, "Reading register ");
	327	strcat (buffer, reg_names[regno]);
	328
	329	perror_with_name (buffer);
	330	}
	331
	332	if (val < 0)
	333	perror_with_name (filename);
	334	#ifdef PYRAMID_CONTROL_FRAME_DEBUGGING
199b2450	335	printf_unfiltered ("[reg %s(%d), offset in file %s=0x%0x, addr =0x%0x, =%0x]\n",
dd3b648e RP	336	reg_names[regno], regno, filename,
	337	register_addr(regno, reg_offset),
	338	regno * 4 + last_frame_address,
	339	((int )buf));
	340	#endif /* PYRAMID_CONTROL_FRAME_DEBUGGING */
	341	supply_register (regno, buf);
	342	}
	343	}
	344	}
	345	if (filename[0] == '/')
	346	corefile = savestring (filename, strlen (filename));
	347	else
	348	{
58ae87f6	349	corefile = concat (current_directory, "/", filename, NULL);
dd3b648e RP	350	}
	351
	352	#if 1 \|\| defined(PYRAMID_CONTROL_FRAME_DEBUGGING)
199b2450	353	printf_unfiltered ("Providing CSP (%s) as nominal address of current frame.\n",
e3af0493	354	local_hex_string(last_frame_address));
dd3b648e RP	355	#endif PYRAMID_CONTROL_FRAME_DEBUGGING
	356	/* FIXME: Which of the following is correct? */
	357	#if 0
	358	set_current_frame ( create_new_frame (read_register (FP_REGNUM),
	359	read_pc ()));
	360	#else
	361	set_current_frame ( create_new_frame (last_frame_address,
	362	read_pc ()));
	363	#endif
	364
	365	select_frame (get_current_frame (), 0);
	366	validate_files ();
	367	}
	368	else if (from_tty)
199b2450	369	printf_unfiltered ("No core file now.\n");
dd3b648e	370	}