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

/* Acorn Risc Machine host machine support.
   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 "arm-opcode.h"

#include <sys/param.h>
#include <sys/dir.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <sys/ptrace.h>
#include <machine/reg.h>

#define N_TXTADDR(hdr) 0x8000
#define N_DATADDR(hdr) (hdr.a_text + 0x8000)

#include "gdbcore.h"

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

#include <errno.h>

void
fetch_inferior_registers (regno)
     int regno;		/* Original value discarded */
{
  register unsigned int regaddr;
  char buf[MAX_REGISTER_RAW_SIZE];
  register int i;

  struct user u;
  unsigned int offset = (char *) &u.u_ar0 - (char *) &u;
  offset = ptrace (PT_READ_U, inferior_pid, (PTRACE_ARG3_TYPE) offset, 0)
      - KERNEL_U_ADDR;

  registers_fetched ();
  
  for (regno = 0; regno < 16; regno++)
    {
      regaddr = offset + regno * 4;
      *(int *)&buf[0] = ptrace (PT_READ_U, inferior_pid,
				(PTRACE_ARG3_TYPE) regaddr, 0);
      if (regno == PC_REGNUM)
	  *(int *)&buf[0] = GET_PC_PART(*(int *)&buf[0]);
      supply_register (regno, buf);
    }
  *(int *)&buf[0] = ptrace (PT_READ_U, inferior_pid,
			    (PTRACE_ARG3_TYPE) (offset + PC*4), 0);
  supply_register (PS_REGNUM, buf); /* set virtual register ps same as pc */

  /* read the floating point registers */
  offset = (char *) &u.u_fp_regs - (char *)&u;
  *(int *)buf = ptrace (PT_READ_U, inferior_pid, (PTRACE_ARG3_TYPE) offset, 0);
  supply_register (FPS_REGNUM, buf);
  for (regno = 16; regno < 24; regno++) {
      regaddr = offset + 4 + 12 * (regno - 16);
      for (i = 0; i < 12; i += sizeof(int))
	  *(int *) &buf[i] = ptrace (PT_READ_U, inferior_pid,
				     (PTRACE_ARG3_TYPE) (regaddr + i), 0);
      supply_register (regno, buf);
  }
}

/* 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];

  struct user u;
  unsigned long value;
  unsigned int offset = (char *) &u.u_ar0 - (char *) &u;
  offset = ptrace (PT_READ_U, inferior_pid, (PTRACE_ARG3_TYPE) offset, 0)
      - KERNEL_U_ADDR;

  if (regno >= 0) {
      if (regno >= 16) return;
      regaddr = offset + 4 * regno;
      errno = 0;
      value = read_register(regno);
      if (regno == PC_REGNUM)
	  value = SET_PC_PART(read_register (PS_REGNUM), value);
      ptrace (PT_WRITE_U, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, value);
      if (errno != 0)
	{
	  sprintf (buf, "writing register number %d", regno);
	  perror_with_name (buf);
	}
    }
  else for (regno = 0; regno < 15; regno++)
    {
      regaddr = offset + regno * 4;
      errno = 0;
      value = read_register(regno);
      if (regno == PC_REGNUM)
	  value = SET_PC_PART(read_register (PS_REGNUM), value);
      ptrace (6, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, value);
      if (errno != 0)
	{
	  sprintf (buf, "writing all regs, number %d", regno);
	  perror_with_name (buf);
	}
    }
}
\f
/* Work with core dump and executable files, for GDB. 
   This code would be in core.c if it weren't machine-dependent. */

/* Structure to describe the chain of shared libraries used
   by the execfile.
   e.g. prog shares Xt which shares X11 which shares c. */

struct shared_library {
    struct exec_header header;
    char name[SHLIBLEN];
    CORE_ADDR text_start;	/* CORE_ADDR of 1st byte of text, this file */
    long data_offset;		/* offset of data section in file */
    int chan;			/* file descriptor for the file */
    struct shared_library *shares; /* library this one shares */
};
static struct shared_library *shlib = 0;

/* Hook for `exec_file_command' command to call.  */

extern void (*exec_file_display_hook) ();
   
static CORE_ADDR unshared_text_start;

/* extended header from exec file (for shared library info) */

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

	unsigned int reg_offset, fp_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);

	/* We are depending on exec_file_command having been called
	   previously to set exec_data_start.  Since the executable
	   and the core file share the same text segment, the address
	   of the data segment will be the same in both.  */
	data_start = exec_data_start;

	data_end = data_start + NBPG * u.u_dsize;
	stack_start = stack_end - NBPG * u.u_ssize;
	data_offset = NBPG * UPAGES;
	stack_offset = NBPG * (UPAGES + u.u_dsize);

	/* 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;
	fp_reg_offset = (char *) &u.u_fp_regs - (char *)&u;

	/* 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 < NUM_REGS; regno++)
	    {
	      char buf[MAX_REGISTER_RAW_SIZE];

	      if (regno < 16)
		  val = lseek (corechan, reg_offset + 4 * regno, 0);
	      else if (regno < 24)
		  val = lseek (corechan, fp_reg_offset + 4 + 12*(regno - 24), 0);
	      else if (regno == 24)
		  val = lseek (corechan, fp_reg_offset, 0);
	      else if (regno == 25)
		  val = lseek (corechan, reg_offset + 4 * PC, 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 (regno == PC_REGNUM)
		  *(int *)buf = GET_PC_PART(*(int *)buf);
	      supply_register (regno, buf);
	    }
	}
      }
      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");
}
Commit	Line	Data
dd3b648e RP	1	/* Acorn Risc Machine host machine support.
	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 RP	19
dd3b648e RP	20	#include "defs.h"
dd3b648e RP	21	#include "frame.h"
	22	#include "inferior.h"
	23	#include "arm-opcode.h"
	24
dd3b648e RP	25	#include <sys/param.h>
	26	#include <sys/dir.h>
	27	#include <signal.h>
	28	#include <sys/ioctl.h>
	29	#include <sys/ptrace.h>
	30	#include <machine/reg.h>
	31
	32	#define N_TXTADDR(hdr) 0x8000
	33	#define N_DATADDR(hdr) (hdr.a_text + 0x8000)
	34
	35	#include "gdbcore.h"
	36
	37	#include <sys/user.h> /* After a.out.h */
	38	#include <sys/file.h>
	39	#include <sys/stat.h>
	40
	41	#include <errno.h>
	42
	43	void
	44	fetch_inferior_registers (regno)
1ab3bf1b	45	int regno; /* Original value discarded */
dd3b648e	46	{
dd3b648e RP	47	register unsigned int regaddr;
	48	char buf[MAX_REGISTER_RAW_SIZE];
	49	register int i;
	50
	51	struct user u;
	52	unsigned int offset = (char ) &u.u_ar0 - (char ) &u;
e676a15f FF	53	offset = ptrace (PT_READ_U, inferior_pid, (PTRACE_ARG3_TYPE) offset, 0)
e676a15f FF	54	- KERNEL_U_ADDR;
dd3b648e RP	55
	56	registers_fetched ();
	57
	58	for (regno = 0; regno < 16; regno++)
	59	{
	60	regaddr = offset + regno * 4;
e676a15f FF	61	(int )&buf[0] = ptrace (PT_READ_U, inferior_pid,
e676a15f FF	62	(PTRACE_ARG3_TYPE) regaddr, 0);
dd3b648e RP	63	if (regno == PC_REGNUM)
	64	(int )&buf[0] = GET_PC_PART((int )&buf[0]);
	65	supply_register (regno, buf);
	66	}
e676a15f FF	67	(int )&buf[0] = ptrace (PT_READ_U, inferior_pid,
e676a15f FF	68	(PTRACE_ARG3_TYPE) (offset + PC*4), 0);
dd3b648e RP	69	supply_register (PS_REGNUM, buf); /* set virtual register ps same as pc */
	70
	71	/* read the floating point registers */
	72	offset = (char ) &u.u_fp_regs - (char )&u;
e676a15f	73	(int )buf = ptrace (PT_READ_U, inferior_pid, (PTRACE_ARG3_TYPE) offset, 0);
dd3b648e RP	74	supply_register (FPS_REGNUM, buf);
	75	for (regno = 16; regno < 24; regno++) {
	76	regaddr = offset + 4 + 12 * (regno - 16);
	77	for (i = 0; i < 12; i += sizeof(int))
e676a15f FF	78	(int ) &buf[i] = ptrace (PT_READ_U, inferior_pid,
e676a15f FF	79	(PTRACE_ARG3_TYPE) (regaddr + i), 0);
dd3b648e RP	80	supply_register (regno, buf);
	81	}
	82	}
	83
	84	/* Store our register values back into the inferior.
	85	If REGNO is -1, do this for all registers.
	86	Otherwise, REGNO specifies which register (so we can save time). */
	87
1ab3bf1b	88	void
dd3b648e RP	89	store_inferior_registers (regno)
	90	int regno;
	91	{
	92	register unsigned int regaddr;
	93	char buf[80];
	94
	95	struct user u;
	96	unsigned long value;
	97	unsigned int offset = (char ) &u.u_ar0 - (char ) &u;
e676a15f FF	98	offset = ptrace (PT_READ_U, inferior_pid, (PTRACE_ARG3_TYPE) offset, 0)
e676a15f FF	99	- KERNEL_U_ADDR;
dd3b648e RP	100
	101	if (regno >= 0) {
	102	if (regno >= 16) return;
	103	regaddr = offset + 4 * regno;
	104	errno = 0;
	105	value = read_register(regno);
	106	if (regno == PC_REGNUM)
	107	value = SET_PC_PART(read_register (PS_REGNUM), value);
e676a15f	108	ptrace (PT_WRITE_U, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, value);
dd3b648e RP	109	if (errno != 0)
	110	{
	111	sprintf (buf, "writing register number %d", regno);
	112	perror_with_name (buf);
	113	}
	114	}
	115	else for (regno = 0; regno < 15; regno++)
	116	{
	117	regaddr = offset + regno * 4;
	118	errno = 0;
	119	value = read_register(regno);
	120	if (regno == PC_REGNUM)
	121	value = SET_PC_PART(read_register (PS_REGNUM), value);
e676a15f	122	ptrace (6, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, value);
dd3b648e RP	123	if (errno != 0)
	124	{
	125	sprintf (buf, "writing all regs, number %d", regno);
	126	perror_with_name (buf);
	127	}
	128	}
	129	}
	130	\f
	131	/* Work with core dump and executable files, for GDB.
	132	This code would be in core.c if it weren't machine-dependent. */
	133
	134	/* Structure to describe the chain of shared libraries used
	135	by the execfile.
	136	e.g. prog shares Xt which shares X11 which shares c. */
	137
	138	struct shared_library {
	139	struct exec_header header;
	140	char name[SHLIBLEN];
	141	CORE_ADDR text_start; /* CORE_ADDR of 1st byte of text, this file */
	142	long data_offset; /* offset of data section in file */
	143	int chan; /* file descriptor for the file */
	144	struct shared_library shares; / library this one shares */
	145	};
	146	static struct shared_library *shlib = 0;
	147
	148	/* Hook for `exec_file_command' command to call. */
	149
	150	extern void (*exec_file_display_hook) ();
	151
	152	static CORE_ADDR unshared_text_start;
	153
	154	/* extended header from exec file (for shared library info) */
	155
	156	static struct exec_header exec_header;
	157	\f
	158	void
	159	core_file_command (filename, from_tty)
	160	char *filename;
	161	int from_tty;
	162	{
	163	int val;
	164	extern char registers[];
	165
	166	/* Discard all vestiges of any previous core file
	167	and mark data and stack spaces as empty. */
	168
	169	if (corefile)
	170	free (corefile);
	171	corefile = 0;
	172
	173	if (corechan >= 0)
	174	close (corechan);
	175	corechan = -1;
	176
	177	data_start = 0;
	178	data_end = 0;
	179	stack_start = STACK_END_ADDR;
	180	stack_end = STACK_END_ADDR;
	181
	182	/* Now, if a new core file was specified, open it and digest it. */
	183
	184	if (filename)
	185	{
	186	filename = tilde_expand (filename);
187	make_cleanup (free, filename);
188
189	if (have_inferior_p ())
6fe90fc8	190	error ("To look at a core file, you must kill the program with \"kill\".");
dd3b648e RP	191	corechan = open (filename, O_RDONLY, 0);
	192	if (corechan < 0)
	193	perror_with_name (filename);
	194	/* 4.2-style (and perhaps also sysV-style) core dump file. */
	195	{
	196	struct user u;
	197
	198	unsigned int reg_offset, fp_reg_offset;
	199
	200	val = myread (corechan, &u, sizeof u);
	201	if (val < 0)
	202	perror_with_name ("Not a core file: reading upage");
	203	if (val != sizeof u)
	204	error ("Not a core file: could only read %d bytes", val);
	205
	206	/* We are depending on exec_file_command having been called
	207	previously to set exec_data_start. Since the executable
	208	and the core file share the same text segment, the address
	209	of the data segment will be the same in both. */
	210	data_start = exec_data_start;
	211
	212	data_end = data_start + NBPG * u.u_dsize;
	213	stack_start = stack_end - NBPG * u.u_ssize;
	214	data_offset = NBPG * UPAGES;
	215	stack_offset = NBPG * (UPAGES + u.u_dsize);
	216
	217	/* Some machines put an absolute address in here and some put
	218	the offset in the upage of the regs. */
	219	reg_offset = (int) u.u_ar0;
	220	if (reg_offset > NBPG * UPAGES)
	221	reg_offset -= KERNEL_U_ADDR;
	222	fp_reg_offset = (char ) &u.u_fp_regs - (char )&u;
	223
	224	/* I don't know where to find this info.
	225	So, for now, mark it as not available. */
	226	N_SET_MAGIC (core_aouthdr, 0);
	227
	228	/* Read the register values out of the core file and store
	229	them where `read_register' will find them. */
	230
	231	{
	232	register int regno;
	233
	234	for (regno = 0; regno < NUM_REGS; regno++)
	235	{
	236	char buf[MAX_REGISTER_RAW_SIZE];
	237
	238	if (regno < 16)
	239	val = lseek (corechan, reg_offset + 4 * regno, 0);
	240	else if (regno < 24)
	241	val = lseek (corechan, fp_reg_offset + 4 + 12*(regno - 24), 0);
	242	else if (regno == 24)
	243	val = lseek (corechan, fp_reg_offset, 0);
	244	else if (regno == 25)
	245	val = lseek (corechan, reg_offset + 4 * PC, 0);
	246	if (val < 0
	247	\|\| (val = myread (corechan, buf, sizeof buf)) < 0)
	248	{
	249	char * buffer = (char *) alloca (strlen (reg_names[regno])
	250	+ 30);
	251	strcpy (buffer, "Reading register ");
	252	strcat (buffer, reg_names[regno]);
	253
	254	perror_with_name (buffer);
255	}
256
257	if (regno == PC_REGNUM)
258	(int )buf = GET_PC_PART((int )buf);
259	supply_register (regno, buf);
260	}
261	}
262	}
263	if (filename[0] == '/')
264	corefile = savestring (filename, strlen (filename));
265	else
266	{
58ae87f6	267	corefile = concat (current_directory, "/", filename, NULL);
dd3b648e RP	268	}
	269
	270	set_current_frame ( create_new_frame (read_register (FP_REGNUM),
	271	read_pc ()));
	272	select_frame (get_current_frame (), 0);
	273	validate_files ();
	274	}
	275	else if (from_tty)
	276	printf ("No core file now.\n");
	277	}