[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 1986, 1987, 1989, 1990, 1991, 1992 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 "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,
7da1e27d SG	2	for GDB, the GNU debugger. This code is for the HP PA-RISC cpu.
5140562f	3	Copyright 1986, 1987, 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
7da1e27d SG	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
7da1e27d SG	27	#include "defs.h"
	28	#include "frame.h"
	29	#include "inferior.h"
	30	#include "target.h"
	31
	32	#ifdef USG
	33	#include <sys/types.h>
	34	#endif
	35
	36	#include <sys/param.h>
	37	#include <sys/dir.h>
	38	#include <signal.h>
	39	#include <sys/ioctl.h>
	40	#ifndef USG
	41	#include <sys/ptrace.h>
	42	#endif
	43
	44
	45	#ifndef PT_ATTACH
	46	#define PT_ATTACH PTRACE_ATTACH
	47	#endif
	48	#ifndef PT_DETACH
	49	#define PT_DETACH PTRACE_DETACH
	50	#endif
	51
	52	#include "gdbcore.h"
	53	#include <sys/user.h> /* After a.out.h */
	54	#include <sys/file.h>
	55	#include <sys/stat.h>
	56	\f
	57	/* This function simply calls ptrace with the given arguments.
	58	It exists so that all calls to ptrace are isolated in this
	59	machine-dependent file. */
	60	int
	61	call_ptrace (request, pid, addr, data)
e676a15f FF	62	int request, pid;
	63	PTRACE_ARG3_TYPE addr;
	64	int data;
7da1e27d SG	65	{
	66	return ptrace (request, pid, addr, data);
	67	}
	68
	69	#ifdef DEBUG_PTRACE
	70	/* For the rest of the file, use an extra level of indirection */
	71	/* This lets us breakpoint usefully on call_ptrace. */
	72	#define ptrace call_ptrace
	73	#endif
	74
	75	/* This is used when GDB is exiting. It gives less chance of error.*/
	76
	77	void
	78	kill_inferior_fast ()
	79	{
	80	if (inferior_pid == 0)
	81	return;
e676a15f	82	ptrace (PT_KILL, inferior_pid, (PTRACE_ARG3_TYPE) 0, 0);
7da1e27d SG	83	wait ((int *)0);
	84	}
	85
	86	void
	87	kill_inferior ()
	88	{
	89	kill_inferior_fast ();
	90	target_mourn_inferior ();
	91	}
	92
	93	/* Resume execution of the inferior process.
	94	If STEP is nonzero, single-step it.
	95	If SIGNAL is nonzero, give it that signal. */
	96
	97	void
	98	child_resume (step, signal)
	99	int step;
	100	int signal;
	101	{
	102	errno = 0;
	103
e676a15f FF	104	/* An address of (PTRACE_ARG3_TYPE) 1 tells ptrace to continue from where
	105	it was. (If GDB wanted it to start some other way, we have already
	106	written a new PC value to the child.) */
7da1e27d SG	107
7da1e27d SG	108	if (step)
e676a15f	109	ptrace (PT_STEP, inferior_pid, (PTRACE_ARG3_TYPE) 1, signal);
7da1e27d	110	else
e676a15f	111	ptrace (PT_CONTINUE, inferior_pid, (PTRACE_ARG3_TYPE) 1, signal);
7da1e27d SG	112
	113	if (errno)
	114	perror_with_name ("ptrace");
	115	}
	116	\f
	117	#ifdef ATTACH_DETACH
	118	/* Nonzero if we are debugging an attached process rather than
	119	an inferior. */
	120	extern int attach_flag;
	121
	122	/* Start debugging the process whose number is PID. */
	123	int
	124	attach (pid)
	125	int pid;
	126	{
	127	errno = 0;
e676a15f	128	ptrace (PT_ATTACH, pid, (PTRACE_ARG3_TYPE) 0, 0);
7da1e27d SG	129	if (errno)
	130	perror_with_name ("ptrace");
	131	attach_flag = 1;
	132	return pid;
	133	}
	134
	135	/* Stop debugging the process whose number is PID
	136	and continue it with signal number SIGNAL.
	137	SIGNAL = 0 means just continue it. */
	138
	139	void
	140	detach (signal)
	141	int signal;
	142	{
	143	errno = 0;
e676a15f	144	ptrace (PT_DETACH, inferior_pid, (PTRACE_ARG3_TYPE) 1, signal);
7da1e27d SG	145	if (errno)
	146	perror_with_name ("ptrace");
	147	attach_flag = 0;
	148	}
	149	#endif /* ATTACH_DETACH */
	150	\f
	151	#if !defined (FETCH_INFERIOR_REGISTERS)
	152
	153	/* KERNEL_U_ADDR is the amount to subtract from u.u_ar0
	154	to get the offset in the core file of the register values. */
	155	#if defined (KERNEL_U_ADDR_BSD)
	156	/* Get kernel_u_addr using BSD-style nlist(). */
	157	CORE_ADDR kernel_u_addr;
	158
	159	#include <a.out.gnu.h> /* For struct nlist */
	160
	161	void
	162	_initialize_kernel_u_addr ()
	163	{
	164	struct nlist names[2];
	165
	166	names[0].n_un.n_name = "_u";
	167	names[1].n_un.n_name = NULL;
	168	if (nlist ("/vmunix", names) == 0)
	169	kernel_u_addr = names[0].n_value;
	170	else
	171	fatal ("Unable to get kernel u area address.");
	172	}
	173	#endif /* KERNEL_U_ADDR_BSD. */
	174
	175	#if defined (KERNEL_U_ADDR_HPUX)
	176	/* Get kernel_u_addr using HPUX-style nlist(). */
	177	CORE_ADDR kernel_u_addr;
	178
	179	struct hpnlist {
	180	char * n_name;
	181	long n_value;
	182	unsigned char n_type;
	183	unsigned char n_length;
	184	short n_almod;
	185	short n_unused;
	186	};
	187	static struct hpnlist nl[] = {{ "_u", -1, }, { (char *) 0, }};
	188
	189	/* read the value of the u area from the hp-ux kernel */
	190	void _initialize_kernel_u_addr ()
	191	{
	192	struct user u;
	193	nlist ("/hp-ux", &nl);
	194	kernel_u_addr = nl[0].n_value;
	195	}
	196	#endif /* KERNEL_U_ADDR_HPUX. */
	197
	198	#if !defined (offsetof)
	199	#define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
	200	#endif
	201
	202	/* U_REGS_OFFSET is the offset of the registers within the u area. */
	203	#if !defined (U_REGS_OFFSET)
	204	#define U_REGS_OFFSET \
	205	ptrace (PT_READ_U, inferior_pid, \
e676a15f FF	206	(PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0) \
e676a15f FF	207	- KERNEL_U_ADDR
7da1e27d SG	208	#endif
	209
	210	/* Registers we shouldn't try to fetch. */
	211	#if !defined (CANNOT_FETCH_REGISTER)
	212	#define CANNOT_FETCH_REGISTER(regno) 0
	213	#endif
	214
	215	/* Fetch one register. */
	216
	217	static void
	218	fetch_register (regno)
	219	int regno;
	220	{
	221	register unsigned int regaddr;
	222	char buf[MAX_REGISTER_RAW_SIZE];
	223	char mess[128]; /* For messages */
	224	register int i;
	225
	226	/* Offset of registers within the u area. */
	227	unsigned int offset;
	228
	229	if (CANNOT_FETCH_REGISTER (regno))
	230	{
	231	bzero (buf, REGISTER_RAW_SIZE (regno)); /* Supply zeroes */
	232	supply_register (regno, buf);
	233	return;
	234	}
	235
	236	offset = U_REGS_OFFSET;
	237
	238	regaddr = register_addr (regno, offset);
	239	for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
	240	{
	241	errno = 0;
e676a15f FF	242	(int ) &buf[i] = ptrace (PT_RUREGS, inferior_pid,
e676a15f FF	243	(PTRACE_ARG3_TYPE) regaddr, 0);
7da1e27d SG	244	regaddr += sizeof (int);
	245	if (errno != 0)
	246	{
	247	sprintf (mess, "reading register %s (#%d)", reg_names[regno], regno);
	248	perror_with_name (mess);
	249	}
	250	}
	251	if (regno == PCOQ_HEAD_REGNUM \|\| regno == PCOQ_TAIL_REGNUM)
	252	buf[3] &= ~0x3;
	253	supply_register (regno, buf);
	254	}
	255
	256
	257	/* Fetch all registers, or just one, from the child process. */
	258
	259	void
	260	fetch_inferior_registers (regno)
	261	int regno;
	262	{
	263	if (regno == -1)
	264	for (regno = 0; regno < NUM_REGS; regno++)
	265	fetch_register (regno);
	266	else
	267	fetch_register (regno);
	268	}
	269
	270	/* Registers we shouldn't try to store. */
	271	#if !defined (CANNOT_STORE_REGISTER)
	272	#define CANNOT_STORE_REGISTER(regno) 0
	273	#endif
	274
	275	/* Store our register values back into the inferior.
	276	If REGNO is -1, do this for all registers.
	277	Otherwise, REGNO specifies which register (so we can save time). */
	278
	279	void
	280	store_inferior_registers (regno)
	281	int regno;
	282	{
	283	register unsigned int regaddr;
	284	char buf[80];
	285	extern char registers[];
	286	register int i;
	287
	288	unsigned int offset = U_REGS_OFFSET;
	289
	290	if (regno >= 0)
	291	{
	292	regaddr = register_addr (regno, offset);
	293	for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof(int))
	294	{
	295	errno = 0;
e676a15f	296	ptrace (PT_WRITE_U, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
7da1e27d SG	297	(int ) &registers[REGISTER_BYTE (regno) + i]);
	298	if (errno != 0)
	299	{
	300	sprintf (buf, "writing register number %d(%d)", regno, i);
	301	perror_with_name (buf);
	302	}
	303	regaddr += sizeof(int);
	304	}
	305	}
	306	else
	307	{
	308	for (regno = 0; regno < NUM_REGS; regno++)
	309	{
	310	if (CANNOT_STORE_REGISTER (regno))
	311	continue;
	312	regaddr = register_addr (regno, offset);
	313	for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof(int))
	314	{
	315	errno = 0;
e676a15f	316	ptrace (PT_WRITE_U, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
7da1e27d SG	317	(int ) &registers[REGISTER_BYTE (regno) + i]);
	318	if (errno != 0)
	319	{
	320	sprintf (buf, "writing register number %d(%d)", regno, i);
	321	perror_with_name (buf);
	322	}
	323	regaddr += sizeof(int);
	324	}
	325	}
	326	}
	327	return;
	328	}
	329	#endif /* !defined (FETCH_INFERIOR_REGISTERS). */
	330	\f
	331	/* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
	332	in the NEW_SUN_PTRACE case.
	333	It ought to be straightforward. But it appears that writing did
	334	not write the data that I specified. I cannot understand where
	335	it got the data that it actually did write. */
	336
	337	/* Copy LEN bytes to or from inferior's memory starting at MEMADDR
	338	to debugger memory starting at MYADDR. Copy to inferior if
	339	WRITE is nonzero.
	340
	341	Returns the length copied, which is either the LEN argument or zero.
	342	This xfer function does not do partial moves, since child_ops
	343	doesn't allow memory operations to cross below us in the target stack
	344	anyway. */
	345
	346	int
	347	child_xfer_memory (memaddr, myaddr, len, write, target)
	348	CORE_ADDR memaddr;
	349	char *myaddr;
	350	int len;
	351	int write;
	352	struct target_ops target; / ignored */
	353	{
	354	register int i;
	355	/* Round starting address down to longword boundary. */
	356	register CORE_ADDR addr = memaddr & - sizeof (int);
	357	/* Round ending address up; get number of longwords that makes. */
	358	register int count
	359	= (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int);
	360	/* Allocate buffer of that many longwords. */
	361	register int buffer = (int ) alloca (count * sizeof (int));
	362
	363	if (write)
	364	{
	365	/* Fill start and end extra bytes of buffer with existing memory data. */
	366
	367	if (addr != memaddr \|\| len < (int)sizeof (int)) {
	368	/* Need part of initial word -- fetch it. */
e676a15f FF	369	buffer[0] = ptrace (PT_READ_I, inferior_pid, (PTRACE_ARG3_TYPE) addr,
e676a15f FF	370	0);
7da1e27d SG	371	}
	372
	373	if (count > 1) /* FIXME, avoid if even boundary */
	374	{
	375	buffer[count - 1]
	376	= ptrace (PT_READ_I, inferior_pid,
e676a15f FF	377	(PTRACE_ARG3_TYPE) (addr + (count - 1) * sizeof (int)),
e676a15f FF	378	0);
7da1e27d SG	379	}
	380
	381	/* Copy data to be written over corresponding part of buffer */
	382
	383	bcopy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len);
	384
	385	/* Write the entire buffer. */
	386
	387	for (i = 0; i < count; i++, addr += sizeof (int))
	388	{
	389	errno = 0;
e676a15f FF	390	ptrace (PT_WRITE_D, inferior_pid, (PTRACE_ARG3_TYPE) addr,
e676a15f FF	391	buffer[i]);
7da1e27d SG	392	if (errno)
	393	{
	394	/* Using the appropriate one (I or D) is necessary for
	395	Gould NP1, at least. */
	396	errno = 0;
e676a15f FF	397	ptrace (PT_WRITE_I, inferior_pid, (PTRACE_ARG3_TYPE) addr,
e676a15f FF	398	buffer[i]);
7da1e27d SG	399	}
	400	if (errno)
	401	return 0;
	402	}
	403	}
	404	else
	405	{
	406	/* Read all the longwords */
	407	for (i = 0; i < count; i++, addr += sizeof (int))
	408	{
	409	errno = 0;
e676a15f FF	410	buffer[i] = ptrace (PT_READ_I, inferior_pid,
e676a15f FF	411	(PTRACE_ARG3_TYPE) addr, 0);
7da1e27d SG	412	if (errno)
	413	return 0;
	414	QUIT;
	415	}
	416
	417	/* Copy appropriate bytes out of the buffer. */
	418	bcopy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len);
	419	}
	420	return len;
	421	}