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

/* Machine-dependent code which would otherwise be in infptrace.c,
   for GDB, the GNU debugger.  This code is for the HP PA-RISC cpu.
   Copyright (C) 1986, 1987, 1989, 1990, 1991 Free Software Foundation, Inc.

   Contributed by the Center for Software Science at the
   University of Utah (pa-gdb-bugs@cs.utah.edu).

/* Low level Unix child interface to ptrace, for GDB when running under Unix.
   Copyright (C) 1988, 1989, 1990, 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 <stdio.h>
#include "defs.h"
#include "frame.h"
#include "inferior.h"
#include "target.h"

#ifdef USG
#include <sys/types.h>
#endif

#include <sys/param.h>
#include <sys/dir.h>
#include <signal.h>
#include <sys/ioctl.h>
#ifndef USG
#include <sys/ptrace.h>
#endif


#ifndef PT_ATTACH
#define PT_ATTACH PTRACE_ATTACH
#endif
#ifndef PT_DETACH
#define PT_DETACH PTRACE_DETACH
#endif

#include "gdbcore.h"
#include <sys/user.h>		/* After a.out.h  */
#include <sys/file.h>
#include <sys/stat.h>
\f
/* This function simply calls ptrace with the given arguments.  
   It exists so that all calls to ptrace are isolated in this 
   machine-dependent file. */
int
call_ptrace (request, pid, addr, data)
     int request, pid;
     PTRACE_ARG3_TYPE addr;
     int data;
{
  return ptrace (request, pid, addr, data);
}

#ifdef DEBUG_PTRACE
/* For the rest of the file, use an extra level of indirection */
/* This lets us breakpoint usefully on call_ptrace. */
#define ptrace call_ptrace
#endif

/* This is used when GDB is exiting.  It gives less chance of error.*/

void
kill_inferior_fast ()
{
  if (inferior_pid == 0)
    return;
  ptrace (PT_KILL, inferior_pid, (PTRACE_ARG3_TYPE) 0, 0);
  wait ((int *)0);
}

void
kill_inferior ()
{
  kill_inferior_fast ();
  target_mourn_inferior ();
}

/* Resume execution of the inferior process.
   If STEP is nonzero, single-step it.
   If SIGNAL is nonzero, give it that signal.  */

void
child_resume (step, signal)
     int step;
     int signal;
{
  errno = 0;

  /* An address of (PTRACE_ARG3_TYPE) 1 tells ptrace to continue from where
     it was. (If GDB wanted it to start some other way, we have already
     written a new PC value to the child.)  */

  if (step)
    ptrace (PT_STEP, inferior_pid, (PTRACE_ARG3_TYPE) 1, signal);
  else
    ptrace (PT_CONTINUE, inferior_pid, (PTRACE_ARG3_TYPE) 1, signal);

  if (errno)
    perror_with_name ("ptrace");
}
\f
#ifdef ATTACH_DETACH
/* Nonzero if we are debugging an attached process rather than
   an inferior.  */
extern int attach_flag;

/* Start debugging the process whose number is PID.  */
int
attach (pid)
     int pid;
{
  errno = 0;
  ptrace (PT_ATTACH, pid, (PTRACE_ARG3_TYPE) 0, 0);
  if (errno)
    perror_with_name ("ptrace");
  attach_flag = 1;
  return pid;
}

/* Stop debugging the process whose number is PID
   and continue it with signal number SIGNAL.
   SIGNAL = 0 means just continue it.  */

void
detach (signal)
     int signal;
{
  errno = 0;
  ptrace (PT_DETACH, inferior_pid, (PTRACE_ARG3_TYPE) 1, signal);
  if (errno)
    perror_with_name ("ptrace");
  attach_flag = 0;
}
#endif /* ATTACH_DETACH */
\f
#if !defined (FETCH_INFERIOR_REGISTERS)

/* KERNEL_U_ADDR is the amount to subtract from u.u_ar0
   to get the offset in the core file of the register values.  */
#if defined (KERNEL_U_ADDR_BSD)
/* Get kernel_u_addr using BSD-style nlist().  */
CORE_ADDR kernel_u_addr;

#include <a.out.gnu.h>		/* For struct nlist */

void
_initialize_kernel_u_addr ()
{
  struct nlist names[2];

  names[0].n_un.n_name = "_u";
  names[1].n_un.n_name = NULL;
  if (nlist ("/vmunix", names) == 0)
    kernel_u_addr = names[0].n_value;
  else
    fatal ("Unable to get kernel u area address.");
}
#endif /* KERNEL_U_ADDR_BSD.  */

#if defined (KERNEL_U_ADDR_HPUX)
/* Get kernel_u_addr using HPUX-style nlist().  */
CORE_ADDR kernel_u_addr;

struct hpnlist {      
        char *          n_name;
        long            n_value;  
        unsigned char   n_type;   
        unsigned char   n_length;  
        short           n_almod;   
        short           n_unused;
};
static struct hpnlist nl[] = {{ "_u", -1, }, { (char *) 0, }};

/* read the value of the u area from the hp-ux kernel */
void _initialize_kernel_u_addr ()
{
    struct user u;
    nlist ("/hp-ux", &nl);
    kernel_u_addr = nl[0].n_value;
}
#endif /* KERNEL_U_ADDR_HPUX.  */

#if !defined (offsetof)
#define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
#endif

/* U_REGS_OFFSET is the offset of the registers within the u area.  */
#if !defined (U_REGS_OFFSET)
#define U_REGS_OFFSET \
  ptrace (PT_READ_U, inferior_pid, \
          (PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0) \
    - KERNEL_U_ADDR
#endif

/* Registers we shouldn't try to fetch.  */
#if !defined (CANNOT_FETCH_REGISTER)
#define CANNOT_FETCH_REGISTER(regno) 0
#endif

/* Fetch one register.  */

static void
fetch_register (regno)
     int regno;
{
  register unsigned int regaddr;
  char buf[MAX_REGISTER_RAW_SIZE];
  char mess[128];				/* For messages */
  register int i;

  /* Offset of registers within the u area.  */
  unsigned int offset;

  if (CANNOT_FETCH_REGISTER (regno))
    {
      bzero (buf, REGISTER_RAW_SIZE (regno));	/* Supply zeroes */
      supply_register (regno, buf);
      return;
    }

  offset = U_REGS_OFFSET;

  regaddr = register_addr (regno, offset);
  for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
    {
      errno = 0;
      *(int *) &buf[i] = ptrace (PT_RUREGS, inferior_pid,
				 (PTRACE_ARG3_TYPE) regaddr, 0);
      regaddr += sizeof (int);
      if (errno != 0)
	{
	  sprintf (mess, "reading register %s (#%d)", reg_names[regno], regno);
	  perror_with_name (mess);
	}
    }
  if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM)
    buf[3] &= ~0x3;
  supply_register (regno, buf);
}


/* Fetch all registers, or just one, from the child process.  */

void
fetch_inferior_registers (regno)
     int regno;
{
  if (regno == -1)
    for (regno = 0; regno < NUM_REGS; regno++)
      fetch_register (regno);
  else
    fetch_register (regno);
}

/* Registers we shouldn't try to store.  */
#if !defined (CANNOT_STORE_REGISTER)
#define CANNOT_STORE_REGISTER(regno) 0
#endif

/* 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];
  extern char registers[];
  register int i;

  unsigned int offset = U_REGS_OFFSET;

  if (regno >= 0)
    {
      regaddr = register_addr (regno, offset);
      for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof(int))
	{
	  errno = 0;
	  ptrace (PT_WRITE_U, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
		  *(int *) &registers[REGISTER_BYTE (regno) + i]);
	  if (errno != 0)
	    {
	      sprintf (buf, "writing register number %d(%d)", regno, i);
	      perror_with_name (buf);
	    }
	  regaddr += sizeof(int);
	}
    }
  else
    {
      for (regno = 0; regno < NUM_REGS; regno++)
	{
	  if (CANNOT_STORE_REGISTER (regno))
	    continue;
	  regaddr = register_addr (regno, offset);
	  for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof(int))
	    {
	      errno = 0;
	      ptrace (PT_WRITE_U, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
		      *(int *) &registers[REGISTER_BYTE (regno) + i]);
	      if (errno != 0)
		{
		  sprintf (buf, "writing register number %d(%d)", regno, i);
		  perror_with_name (buf);
		}
	      regaddr += sizeof(int);
	    }
	}
    }
  return;
}
#endif /* !defined (FETCH_INFERIOR_REGISTERS).  */
\f
/* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
   in the NEW_SUN_PTRACE case.
   It ought to be straightforward.  But it appears that writing did
   not write the data that I specified.  I cannot understand where
   it got the data that it actually did write.  */

/* Copy LEN bytes to or from inferior's memory starting at MEMADDR
   to debugger memory starting at MYADDR.   Copy to inferior if
   WRITE is nonzero.
  
   Returns the length copied, which is either the LEN argument or zero.
   This xfer function does not do partial moves, since child_ops
   doesn't allow memory operations to cross below us in the target stack
   anyway.  */

int
child_xfer_memory (memaddr, myaddr, len, write, target)
     CORE_ADDR memaddr;
     char *myaddr;
     int len;
     int write;
     struct target_ops *target;		/* ignored */
{
  register int i;
  /* Round starting address down to longword boundary.  */
  register CORE_ADDR addr = memaddr & - sizeof (int);
  /* Round ending address up; get number of longwords that makes.  */
  register int count
    = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int);
  /* Allocate buffer of that many longwords.  */
  register int *buffer = (int *) alloca (count * sizeof (int));

  if (write)
    {
      /* Fill start and end extra bytes of buffer with existing memory data.  */

      if (addr != memaddr || len < (int)sizeof (int)) {
	/* Need part of initial word -- fetch it.  */
        buffer[0] = ptrace (PT_READ_I, inferior_pid, (PTRACE_ARG3_TYPE) addr,
			    0);
      }

      if (count > 1)		/* FIXME, avoid if even boundary */
	{
	  buffer[count - 1]
	    = ptrace (PT_READ_I, inferior_pid,
		      (PTRACE_ARG3_TYPE) (addr + (count - 1) * sizeof (int)),
		      0);
	}

      /* Copy data to be written over corresponding part of buffer */

      bcopy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len);

      /* Write the entire buffer.  */

      for (i = 0; i < count; i++, addr += sizeof (int))
	{
	  errno = 0;
	  ptrace (PT_WRITE_D, inferior_pid, (PTRACE_ARG3_TYPE) addr,
		  buffer[i]);
	  if (errno)
	    {
	      /* Using the appropriate one (I or D) is necessary for
		 Gould NP1, at least.  */
	      errno = 0;
	      ptrace (PT_WRITE_I, inferior_pid, (PTRACE_ARG3_TYPE) addr,
		      buffer[i]);
	    }
	  if (errno)
	    return 0;
	}
    }
  else
    {
      /* Read all the longwords */
      for (i = 0; i < count; i++, addr += sizeof (int))
	{
	  errno = 0;
	  buffer[i] = ptrace (PT_READ_I, inferior_pid,
			      (PTRACE_ARG3_TYPE) addr, 0);
	  if (errno)
	    return 0;
	  QUIT;
	}

      /* Copy appropriate bytes out of the buffer.  */
      bcopy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len);
    }
  return len;
}
Commit	Line	Data
7da1e27d SG	1	/* Machine-dependent code which would otherwise be in infptrace.c,
	2	for GDB, the GNU debugger. This code is for the HP PA-RISC cpu.
	3	Copyright (C) 1986, 1987, 1989, 1990, 1991 Free Software Foundation, Inc.
	4
	5	Contributed by the Center for Software Science at the
	6	University of Utah (pa-gdb-bugs@cs.utah.edu).
	7
	8	/* Low level Unix child interface to ptrace, for GDB when running under Unix.
	9	Copyright (C) 1988, 1989, 1990, 1991 Free Software Foundation, Inc.
	10
	11	This file is part of GDB.
	12
	13	This program is free software; you can redistribute it and/or modify
	14	it under the terms of the GNU General Public License as published by
	15	the Free Software Foundation; either version 2 of the License, or
	16	(at your option) any later version.
	17
	18	This program is distributed in the hope that it will be useful,
	19	but WITHOUT ANY WARRANTY; without even the implied warranty of
	20	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	21	GNU General Public License for more details.
	22
	23	You should have received a copy of the GNU General Public License
	24	along with this program; if not, write to the Free Software
	25	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
	26
	27	#include <stdio.h>
	28	#include "defs.h"
	29	#include "frame.h"
	30	#include "inferior.h"
	31	#include "target.h"
	32
	33	#ifdef USG
	34	#include <sys/types.h>
	35	#endif
	36
	37	#include <sys/param.h>
	38	#include <sys/dir.h>
	39	#include <signal.h>
	40	#include <sys/ioctl.h>
	41	#ifndef USG
	42	#include <sys/ptrace.h>
	43	#endif
	44
	45
	46	#ifndef PT_ATTACH
	47	#define PT_ATTACH PTRACE_ATTACH
	48	#endif
	49	#ifndef PT_DETACH
	50	#define PT_DETACH PTRACE_DETACH
	51	#endif
	52
	53	#include "gdbcore.h"
	54	#include <sys/user.h> /* After a.out.h */
	55	#include <sys/file.h>
	56	#include <sys/stat.h>
	57	\f
	58	/* This function simply calls ptrace with the given arguments.
	59	It exists so that all calls to ptrace are isolated in this
	60	machine-dependent file. */
	61	int
	62	call_ptrace (request, pid, addr, data)
e676a15f FF	63	int request, pid;
	64	PTRACE_ARG3_TYPE addr;
	65	int data;
7da1e27d SG	66	{
	67	return ptrace (request, pid, addr, data);
	68	}
	69
	70	#ifdef DEBUG_PTRACE
	71	/* For the rest of the file, use an extra level of indirection */
	72	/* This lets us breakpoint usefully on call_ptrace. */
	73	#define ptrace call_ptrace
	74	#endif
	75
	76	/* This is used when GDB is exiting. It gives less chance of error.*/
	77
	78	void
	79	kill_inferior_fast ()
	80	{
	81	if (inferior_pid == 0)
	82	return;
e676a15f	83	ptrace (PT_KILL, inferior_pid, (PTRACE_ARG3_TYPE) 0, 0);
7da1e27d SG	84	wait ((int *)0);
	85	}
	86
	87	void
	88	kill_inferior ()
	89	{
	90	kill_inferior_fast ();
	91	target_mourn_inferior ();
	92	}
	93
	94	/* Resume execution of the inferior process.
	95	If STEP is nonzero, single-step it.
	96	If SIGNAL is nonzero, give it that signal. */
	97
	98	void
	99	child_resume (step, signal)
	100	int step;
	101	int signal;
	102	{
	103	errno = 0;
	104
e676a15f FF	105	/* An address of (PTRACE_ARG3_TYPE) 1 tells ptrace to continue from where
	106	it was. (If GDB wanted it to start some other way, we have already
	107	written a new PC value to the child.) */
7da1e27d SG	108
7da1e27d SG	109	if (step)
e676a15f	110	ptrace (PT_STEP, inferior_pid, (PTRACE_ARG3_TYPE) 1, signal);
7da1e27d	111	else
e676a15f	112	ptrace (PT_CONTINUE, inferior_pid, (PTRACE_ARG3_TYPE) 1, signal);
7da1e27d SG	113
	114	if (errno)
	115	perror_with_name ("ptrace");
	116	}
	117	\f
	118	#ifdef ATTACH_DETACH
	119	/* Nonzero if we are debugging an attached process rather than
	120	an inferior. */
	121	extern int attach_flag;
	122
	123	/* Start debugging the process whose number is PID. */
	124	int
	125	attach (pid)
	126	int pid;
	127	{
	128	errno = 0;
e676a15f	129	ptrace (PT_ATTACH, pid, (PTRACE_ARG3_TYPE) 0, 0);
7da1e27d SG	130	if (errno)
	131	perror_with_name ("ptrace");
	132	attach_flag = 1;
	133	return pid;
	134	}
	135
	136	/* Stop debugging the process whose number is PID
	137	and continue it with signal number SIGNAL.
	138	SIGNAL = 0 means just continue it. */
	139
	140	void
	141	detach (signal)
	142	int signal;
	143	{
	144	errno = 0;
e676a15f	145	ptrace (PT_DETACH, inferior_pid, (PTRACE_ARG3_TYPE) 1, signal);
7da1e27d SG	146	if (errno)
	147	perror_with_name ("ptrace");
	148	attach_flag = 0;
	149	}
	150	#endif /* ATTACH_DETACH */
	151	\f
	152	#if !defined (FETCH_INFERIOR_REGISTERS)
	153
	154	/* KERNEL_U_ADDR is the amount to subtract from u.u_ar0
	155	to get the offset in the core file of the register values. */
	156	#if defined (KERNEL_U_ADDR_BSD)
	157	/* Get kernel_u_addr using BSD-style nlist(). */
	158	CORE_ADDR kernel_u_addr;
	159
	160	#include <a.out.gnu.h> /* For struct nlist */
	161
	162	void
	163	_initialize_kernel_u_addr ()
	164	{
	165	struct nlist names[2];
	166
	167	names[0].n_un.n_name = "_u";
	168	names[1].n_un.n_name = NULL;
	169	if (nlist ("/vmunix", names) == 0)
	170	kernel_u_addr = names[0].n_value;
	171	else
	172	fatal ("Unable to get kernel u area address.");
	173	}
	174	#endif /* KERNEL_U_ADDR_BSD. */
	175
	176	#if defined (KERNEL_U_ADDR_HPUX)
	177	/* Get kernel_u_addr using HPUX-style nlist(). */
	178	CORE_ADDR kernel_u_addr;
	179
	180	struct hpnlist {
	181	char * n_name;
	182	long n_value;
	183	unsigned char n_type;
	184	unsigned char n_length;
	185	short n_almod;
	186	short n_unused;
	187	};
	188	static struct hpnlist nl[] = {{ "_u", -1, }, { (char *) 0, }};
	189
	190	/* read the value of the u area from the hp-ux kernel */
	191	void _initialize_kernel_u_addr ()
	192	{
	193	struct user u;
	194	nlist ("/hp-ux", &nl);
	195	kernel_u_addr = nl[0].n_value;
	196	}
	197	#endif /* KERNEL_U_ADDR_HPUX. */
	198
	199	#if !defined (offsetof)
	200	#define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
	201	#endif
	202
	203	/* U_REGS_OFFSET is the offset of the registers within the u area. */
	204	#if !defined (U_REGS_OFFSET)
	205	#define U_REGS_OFFSET \
	206	ptrace (PT_READ_U, inferior_pid, \
e676a15f FF	207	(PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0) \
e676a15f FF	208	- KERNEL_U_ADDR
7da1e27d SG	209	#endif
	210
	211	/* Registers we shouldn't try to fetch. */
	212	#if !defined (CANNOT_FETCH_REGISTER)
	213	#define CANNOT_FETCH_REGISTER(regno) 0
	214	#endif
	215
	216	/* Fetch one register. */
	217
	218	static void
	219	fetch_register (regno)
	220	int regno;
	221	{
	222	register unsigned int regaddr;
	223	char buf[MAX_REGISTER_RAW_SIZE];
	224	char mess[128]; /* For messages */
	225	register int i;
	226
	227	/* Offset of registers within the u area. */
	228	unsigned int offset;
	229
	230	if (CANNOT_FETCH_REGISTER (regno))
	231	{
	232	bzero (buf, REGISTER_RAW_SIZE (regno)); /* Supply zeroes */
	233	supply_register (regno, buf);
	234	return;
	235	}
	236
	237	offset = U_REGS_OFFSET;
	238
	239	regaddr = register_addr (regno, offset);
	240	for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
	241	{
	242	errno = 0;
e676a15f FF	243	(int ) &buf[i] = ptrace (PT_RUREGS, inferior_pid,
e676a15f FF	244	(PTRACE_ARG3_TYPE) regaddr, 0);
7da1e27d SG	245	regaddr += sizeof (int);
	246	if (errno != 0)
	247	{
	248	sprintf (mess, "reading register %s (#%d)", reg_names[regno], regno);
	249	perror_with_name (mess);
	250	}
	251	}
	252	if (regno == PCOQ_HEAD_REGNUM \|\| regno == PCOQ_TAIL_REGNUM)
	253	buf[3] &= ~0x3;
	254	supply_register (regno, buf);
	255	}
	256
	257
	258	/* Fetch all registers, or just one, from the child process. */
	259
	260	void
	261	fetch_inferior_registers (regno)
	262	int regno;
	263	{
	264	if (regno == -1)
	265	for (regno = 0; regno < NUM_REGS; regno++)
	266	fetch_register (regno);
	267	else
	268	fetch_register (regno);
	269	}
	270
	271	/* Registers we shouldn't try to store. */
	272	#if !defined (CANNOT_STORE_REGISTER)
	273	#define CANNOT_STORE_REGISTER(regno) 0
	274	#endif
	275
	276	/* Store our register values back into the inferior.
	277	If REGNO is -1, do this for all registers.
	278	Otherwise, REGNO specifies which register (so we can save time). */
	279
	280	void
	281	store_inferior_registers (regno)
	282	int regno;
	283	{
	284	register unsigned int regaddr;
	285	char buf[80];
	286	extern char registers[];
	287	register int i;
	288
	289	unsigned int offset = U_REGS_OFFSET;
	290
	291	if (regno >= 0)
	292	{
	293	regaddr = register_addr (regno, offset);
	294	for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof(int))
	295	{
	296	errno = 0;
e676a15f	297	ptrace (PT_WRITE_U, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
7da1e27d SG	298	(int ) &registers[REGISTER_BYTE (regno) + i]);
	299	if (errno != 0)
	300	{
	301	sprintf (buf, "writing register number %d(%d)", regno, i);
	302	perror_with_name (buf);
	303	}
	304	regaddr += sizeof(int);
	305	}
	306	}
	307	else
	308	{
	309	for (regno = 0; regno < NUM_REGS; regno++)
	310	{
	311	if (CANNOT_STORE_REGISTER (regno))
	312	continue;
	313	regaddr = register_addr (regno, offset);
	314	for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof(int))
	315	{
	316	errno = 0;
e676a15f	317	ptrace (PT_WRITE_U, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
7da1e27d SG	318	(int ) &registers[REGISTER_BYTE (regno) + i]);
	319	if (errno != 0)
	320	{
	321	sprintf (buf, "writing register number %d(%d)", regno, i);
	322	perror_with_name (buf);
	323	}
	324	regaddr += sizeof(int);
	325	}
	326	}
	327	}
	328	return;
	329	}
	330	#endif /* !defined (FETCH_INFERIOR_REGISTERS). */
	331	\f
	332	/* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
	333	in the NEW_SUN_PTRACE case.
	334	It ought to be straightforward. But it appears that writing did
	335	not write the data that I specified. I cannot understand where
	336	it got the data that it actually did write. */
	337
	338	/* Copy LEN bytes to or from inferior's memory starting at MEMADDR
	339	to debugger memory starting at MYADDR. Copy to inferior if
	340	WRITE is nonzero.
	341
	342	Returns the length copied, which is either the LEN argument or zero.
	343	This xfer function does not do partial moves, since child_ops
	344	doesn't allow memory operations to cross below us in the target stack
	345	anyway. */
	346
	347	int
	348	child_xfer_memory (memaddr, myaddr, len, write, target)
	349	CORE_ADDR memaddr;
	350	char *myaddr;
	351	int len;
	352	int write;
	353	struct target_ops target; / ignored */
	354	{
	355	register int i;
	356	/* Round starting address down to longword boundary. */
	357	register CORE_ADDR addr = memaddr & - sizeof (int);
	358	/* Round ending address up; get number of longwords that makes. */
	359	register int count
	360	= (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int);
	361	/* Allocate buffer of that many longwords. */
	362	register int buffer = (int ) alloca (count * sizeof (int));
	363
	364	if (write)
	365	{
	366	/* Fill start and end extra bytes of buffer with existing memory data. */
	367
	368	if (addr != memaddr \|\| len < (int)sizeof (int)) {
	369	/* Need part of initial word -- fetch it. */
e676a15f FF	370	buffer[0] = ptrace (PT_READ_I, inferior_pid, (PTRACE_ARG3_TYPE) addr,
e676a15f FF	371	0);
7da1e27d SG	372	}
	373
	374	if (count > 1) /* FIXME, avoid if even boundary */
	375	{
	376	buffer[count - 1]
	377	= ptrace (PT_READ_I, inferior_pid,
e676a15f FF	378	(PTRACE_ARG3_TYPE) (addr + (count - 1) * sizeof (int)),
e676a15f FF	379	0);
7da1e27d SG	380	}
	381
	382	/* Copy data to be written over corresponding part of buffer */
	383
	384	bcopy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len);
	385
	386	/* Write the entire buffer. */
	387
	388	for (i = 0; i < count; i++, addr += sizeof (int))
	389	{
	390	errno = 0;
e676a15f FF	391	ptrace (PT_WRITE_D, inferior_pid, (PTRACE_ARG3_TYPE) addr,
e676a15f FF	392	buffer[i]);
7da1e27d SG	393	if (errno)
	394	{
	395	/* Using the appropriate one (I or D) is necessary for
	396	Gould NP1, at least. */
	397	errno = 0;
e676a15f FF	398	ptrace (PT_WRITE_I, inferior_pid, (PTRACE_ARG3_TYPE) addr,
e676a15f FF	399	buffer[i]);
7da1e27d SG	400	}
	401	if (errno)
	402	return 0;
	403	}
	404	}
	405	else
	406	{
	407	/* Read all the longwords */
	408	for (i = 0; i < count; i++, addr += sizeof (int))
	409	{
	410	errno = 0;
e676a15f FF	411	buffer[i] = ptrace (PT_READ_I, inferior_pid,
e676a15f FF	412	(PTRACE_ARG3_TYPE) addr, 0);
7da1e27d SG	413	if (errno)
	414	return 0;
	415	QUIT;
	416	}
	417
	418	/* Copy appropriate bytes out of the buffer. */
	419	bcopy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len);
	420	}
	421	return len;
	422	}
	423
	424
	425
	426