[deliverable/binutils-gdb.git] / gdb / infptrace.c

/* Low level Unix child interface to ptrace, for GDB when running under Unix.
   Copyright 1988, 1989, 1990, 1991, 1992 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"

#include "nm.h"

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

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

#ifdef PTRACE_IN_WRONG_PLACE
#include <ptrace.h>
#else
#include <sys/ptrace.h>
#endif

#if !defined (PT_KILL)
#define PT_KILL 8
#define PT_STEP 9
#define PT_CONTINUE 7
#define PT_READ_U 3
#define PT_WRITE_U 6
#define PT_READ_I 1
#define	PT_READ_D 2
#define PT_WRITE_I 4
#define PT_WRITE_D 5
#endif /* No PT_KILL.  */

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

#include "gdbcore.h"
#ifndef	NO_SYS_FILE
#include <sys/file.h>
#endif
#include <sys/stat.h>

#if !defined (FETCH_INFERIOR_REGISTERS)
#include <sys/user.h>		/* Probably need to poke the user structure */
#if defined (KERNEL_U_ADDR_BSD)
#include <a.out.h>		/* For struct nlist */
#endif /* KERNEL_U_ADDR_BSD.  */
#endif /* !FETCH_INFERIOR_REGISTERS */

\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

void
kill_inferior ()
{
  if (inferior_pid == 0)
    return;
  /* ptrace PT_KILL only works if process is stopped!!!  So stop it with
     a real signal first, if we can.  */
  kill (inferior_pid, SIGKILL);
  ptrace (PT_KILL, inferior_pid, (PTRACE_ARG3_TYPE) 0, 0);
  wait ((int *)0);
  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 this system does not support PT_STEP, a higher level function will
     have called single_step() to transmute the step request into a
     continue request (by setting breakpoints on all possible successor
     instructions), so we don't have to worry about that here.  */

  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;

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 ()
{
    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_READ_U, 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);
	}
    }
  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);
	    }
	}
    }
}
#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 */

      memcpy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, 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.  */
      memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len);
    }
  return len;
}
Commit	Line	Data
bd5635a1	1	/* Low level Unix child interface to ptrace, for GDB when running under Unix.
ee0613d1	2	Copyright 1988, 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
bd5635a1 RP	3
	4	This file is part of GDB.
	5
b6de2014	6	This program is free software; you can redistribute it and/or modify
bd5635a1	7	it under the terms of the GNU General Public License as published by
b6de2014 JG	8	the Free Software Foundation; either version 2 of the License, or
b6de2014 JG	9	(at your option) any later version.
bd5635a1	10
b6de2014	11	This program is distributed in the hope that it will be useful,
bd5635a1 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
b6de2014 JG	17	along with this program; if not, write to the Free Software
b6de2014 JG	18	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
bd5635a1	19
bd5635a1	20	#include "defs.h"
bd5635a1 RP	21	#include "frame.h"
	22	#include "inferior.h"
	23	#include "target.h"
	24
ef6f3a8b	25	#include "nm.h"
c9c23412	26
bd5635a1 RP	27	#ifdef USG
	28	#include <sys/types.h>
	29	#endif
	30
	31	#include <sys/param.h>
	32	#include <sys/dir.h>
	33	#include <signal.h>
	34	#include <sys/ioctl.h>
ef6f3a8b	35
a0f9783e SG	36	#ifdef PTRACE_IN_WRONG_PLACE
	37	#include <ptrace.h>
	38	#else
bd5635a1	39	#include <sys/ptrace.h>
8ffd75c8 JG	40	#endif
8ffd75c8 JG	41
bd5635a1 RP	42	#if !defined (PT_KILL)
	43	#define PT_KILL 8
	44	#define PT_STEP 9
	45	#define PT_CONTINUE 7
	46	#define PT_READ_U 3
	47	#define PT_WRITE_U 6
	48	#define PT_READ_I 1
8ffd75c8	49	#define PT_READ_D 2
bd5635a1	50	#define PT_WRITE_I 4
8ffd75c8	51	#define PT_WRITE_D 5
bd5635a1 RP	52	#endif /* No PT_KILL. */
	53
	54	#ifndef PT_ATTACH
	55	#define PT_ATTACH PTRACE_ATTACH
	56	#endif
	57	#ifndef PT_DETACH
	58	#define PT_DETACH PTRACE_DETACH
	59	#endif
	60
	61	#include "gdbcore.h"
ee0613d1	62	#ifndef NO_SYS_FILE
bd5635a1	63	#include <sys/file.h>
ee0613d1	64	#endif
bd5635a1	65	#include <sys/stat.h>
44ff4c96 JG	66
	67	#if !defined (FETCH_INFERIOR_REGISTERS)
	68	#include <sys/user.h> /* Probably need to poke the user structure */
	69	#if defined (KERNEL_U_ADDR_BSD)
	70	#include <a.out.h> /* For struct nlist */
	71	#endif /* KERNEL_U_ADDR_BSD. */
	72	#endif /* !FETCH_INFERIOR_REGISTERS */
e676a15f	73
bd5635a1 RP	74	\f
	75	/* This function simply calls ptrace with the given arguments.
	76	It exists so that all calls to ptrace are isolated in this
	77	machine-dependent file. */
	78	int
	79	call_ptrace (request, pid, addr, data)
e676a15f FF	80	int request, pid;
	81	PTRACE_ARG3_TYPE addr;
	82	int data;
bd5635a1 RP	83	{
	84	return ptrace (request, pid, addr, data);
	85	}
	86
	87	#ifdef DEBUG_PTRACE
	88	/* For the rest of the file, use an extra level of indirection */
	89	/* This lets us breakpoint usefully on call_ptrace. */
	90	#define ptrace call_ptrace
	91	#endif
	92
bd5635a1	93	void
c9c23412	94	kill_inferior ()
bd5635a1 RP	95	{
	96	if (inferior_pid == 0)
	97	return;
c9c23412 RP	98	/* ptrace PT_KILL only works if process is stopped!!! So stop it with
	99	a real signal first, if we can. */
	100	kill (inferior_pid, SIGKILL);
e676a15f	101	ptrace (PT_KILL, inferior_pid, (PTRACE_ARG3_TYPE) 0, 0);
bd5635a1	102	wait ((int *)0);
bd5635a1 RP	103	target_mourn_inferior ();
	104	}
	105
	106	/* Resume execution of the inferior process.
	107	If STEP is nonzero, single-step it.
	108	If SIGNAL is nonzero, give it that signal. */
	109
	110	void
	111	child_resume (step, signal)
	112	int step;
	113	int signal;
	114	{
	115	errno = 0;
d11c44f1	116
e676a15f FF	117	/* An address of (PTRACE_ARG3_TYPE)1 tells ptrace to continue from where
e676a15f FF	118	it was. (If GDB wanted it to start some other way, we have already
997cc2c0 JG	119	written a new PC value to the child.)
	120
	121	If this system does not support PT_STEP, a higher level function will
	122	have called single_step() to transmute the step request into a
	123	continue request (by setting breakpoints on all possible successor
	124	instructions), so we don't have to worry about that here. */
d11c44f1	125
bd5635a1	126	if (step)
6bb40269	127	ptrace (PT_STEP, inferior_pid, (PTRACE_ARG3_TYPE) 1, signal);
bd5635a1	128	else
e676a15f	129	ptrace (PT_CONTINUE, inferior_pid, (PTRACE_ARG3_TYPE) 1, signal);
d11c44f1	130
bd5635a1 RP	131	if (errno)
	132	perror_with_name ("ptrace");
	133	}
	134	\f
	135	#ifdef ATTACH_DETACH
	136	/* Nonzero if we are debugging an attached process rather than
	137	an inferior. */
	138	extern int attach_flag;
	139
	140	/* Start debugging the process whose number is PID. */
	141	int
	142	attach (pid)
	143	int pid;
	144	{
	145	errno = 0;
e676a15f	146	ptrace (PT_ATTACH, pid, (PTRACE_ARG3_TYPE) 0, 0);
bd5635a1 RP	147	if (errno)
	148	perror_with_name ("ptrace");
	149	attach_flag = 1;
	150	return pid;
	151	}
	152
	153	/* Stop debugging the process whose number is PID
	154	and continue it with signal number SIGNAL.
	155	SIGNAL = 0 means just continue it. */
	156
	157	void
	158	detach (signal)
	159	int signal;
	160	{
	161	errno = 0;
e676a15f	162	ptrace (PT_DETACH, inferior_pid, (PTRACE_ARG3_TYPE) 1, signal);
bd5635a1 RP	163	if (errno)
	164	perror_with_name ("ptrace");
	165	attach_flag = 0;
	166	}
	167	#endif /* ATTACH_DETACH */
	168	\f
	169	#if !defined (FETCH_INFERIOR_REGISTERS)
	170
	171	/* KERNEL_U_ADDR is the amount to subtract from u.u_ar0
	172	to get the offset in the core file of the register values. */
	173	#if defined (KERNEL_U_ADDR_BSD)
	174	/* Get kernel_u_addr using BSD-style nlist(). */
	175	CORE_ADDR kernel_u_addr;
	176
	177	void
	178	_initialize_kernel_u_addr ()
	179	{
	180	struct nlist names[2];
	181
	182	names[0].n_un.n_name = "_u";
	183	names[1].n_un.n_name = NULL;
	184	if (nlist ("/vmunix", names) == 0)
	185	kernel_u_addr = names[0].n_value;
	186	else
	187	fatal ("Unable to get kernel u area address.");
	188	}
	189	#endif /* KERNEL_U_ADDR_BSD. */
	190
	191	#if defined (KERNEL_U_ADDR_HPUX)
	192	/* Get kernel_u_addr using HPUX-style nlist(). */
	193	CORE_ADDR kernel_u_addr;
	194
	195	struct hpnlist {
	196	char * n_name;
	197	long n_value;
	198	unsigned char n_type;
	199	unsigned char n_length;
	200	short n_almod;
	201	short n_unused;
	202	};
	203	static struct hpnlist nl[] = {{ "_u", -1, }, { (char *) 0, }};
	204
	205	/* read the value of the u area from the hp-ux kernel */
	206	void _initialize_kernel_u_addr ()
	207	{
bd5635a1 RP	208	nlist ("/hp-ux", &nl);
	209	kernel_u_addr = nl[0].n_value;
	210	}
	211	#endif /* KERNEL_U_ADDR_HPUX. */
	212
	213	#if !defined (offsetof)
	214	#define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
	215	#endif
	216
	217	/* U_REGS_OFFSET is the offset of the registers within the u area. */
	218	#if !defined (U_REGS_OFFSET)
	219	#define U_REGS_OFFSET \
	220	ptrace (PT_READ_U, inferior_pid, \
e676a15f FF	221	(PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0) \
e676a15f FF	222	- KERNEL_U_ADDR
bd5635a1 RP	223	#endif
bd5635a1 RP	224
44ff4c96 JG	225	/* Registers we shouldn't try to fetch. */
	226	#if !defined (CANNOT_FETCH_REGISTER)
	227	#define CANNOT_FETCH_REGISTER(regno) 0
	228	#endif
	229
bd5635a1	230	/* Fetch one register. */
44ff4c96	231
bd5635a1 RP	232	static void
	233	fetch_register (regno)
	234	int regno;
	235	{
	236	register unsigned int regaddr;
	237	char buf[MAX_REGISTER_RAW_SIZE];
44ff4c96	238	char mess[128]; /* For messages */
bd5635a1 RP	239	register int i;
	240
	241	/* Offset of registers within the u area. */
44ff4c96 JG	242	unsigned int offset;
	243
	244	if (CANNOT_FETCH_REGISTER (regno))
	245	{
	246	bzero (buf, REGISTER_RAW_SIZE (regno)); /* Supply zeroes */
	247	supply_register (regno, buf);
	248	return;
	249	}
	250
	251	offset = U_REGS_OFFSET;
bd5635a1 RP	252
	253	regaddr = register_addr (regno, offset);
	254	for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
	255	{
44ff4c96	256	errno = 0;
e676a15f FF	257	(int ) &buf[i] = ptrace (PT_READ_U, inferior_pid,
e676a15f FF	258	(PTRACE_ARG3_TYPE) regaddr, 0);
bd5635a1	259	regaddr += sizeof (int);
44ff4c96 JG	260	if (errno != 0)
	261	{
	262	sprintf (mess, "reading register %s (#%d)", reg_names[regno], regno);
	263	perror_with_name (mess);
	264	}
bd5635a1 RP	265	}
	266	supply_register (regno, buf);
	267	}
	268
44ff4c96	269
5594d534	270	/* Fetch all registers, or just one, from the child process. */
bd5635a1	271
5594d534	272	void
bd5635a1 RP	273	fetch_inferior_registers (regno)
	274	int regno;
	275	{
	276	if (regno == -1)
	277	for (regno = 0; regno < NUM_REGS; regno++)
	278	fetch_register (regno);
	279	else
	280	fetch_register (regno);
bd5635a1 RP	281	}
	282
	283	/* Registers we shouldn't try to store. */
	284	#if !defined (CANNOT_STORE_REGISTER)
	285	#define CANNOT_STORE_REGISTER(regno) 0
	286	#endif
	287
	288	/* Store our register values back into the inferior.
	289	If REGNO is -1, do this for all registers.
	290	Otherwise, REGNO specifies which register (so we can save time). */
	291
e676a15f	292	void
bd5635a1 RP	293	store_inferior_registers (regno)
	294	int regno;
	295	{
	296	register unsigned int regaddr;
	297	char buf[80];
	298	extern char registers[];
	299	register int i;
bd5635a1 RP	300
	301	unsigned int offset = U_REGS_OFFSET;
	302
	303	if (regno >= 0)
	304	{
	305	regaddr = register_addr (regno, offset);
	306	for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof(int))
	307	{
	308	errno = 0;
e676a15f	309	ptrace (PT_WRITE_U, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
bd5635a1 RP	310	(int ) &registers[REGISTER_BYTE (regno) + i]);
	311	if (errno != 0)
	312	{
	313	sprintf (buf, "writing register number %d(%d)", regno, i);
	314	perror_with_name (buf);
bd5635a1 RP	315	}
	316	regaddr += sizeof(int);
	317	}
	318	}
	319	else
	320	{
	321	for (regno = 0; regno < NUM_REGS; regno++)
	322	{
	323	if (CANNOT_STORE_REGISTER (regno))
	324	continue;
	325	regaddr = register_addr (regno, offset);
	326	for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof(int))
	327	{
	328	errno = 0;
e676a15f	329	ptrace (PT_WRITE_U, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
bd5635a1 RP	330	(int ) &registers[REGISTER_BYTE (regno) + i]);
	331	if (errno != 0)
	332	{
	333	sprintf (buf, "writing register number %d(%d)", regno, i);
	334	perror_with_name (buf);
bd5635a1 RP	335	}
	336	regaddr += sizeof(int);
	337	}
	338	}
	339	}
bd5635a1 RP	340	}
	341	#endif /* !defined (FETCH_INFERIOR_REGISTERS). */
	342	\f
	343	/* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
	344	in the NEW_SUN_PTRACE case.
	345	It ought to be straightforward. But it appears that writing did
	346	not write the data that I specified. I cannot understand where
	347	it got the data that it actually did write. */
	348
	349	/* Copy LEN bytes to or from inferior's memory starting at MEMADDR
	350	to debugger memory starting at MYADDR. Copy to inferior if
	351	WRITE is nonzero.
	352
	353	Returns the length copied, which is either the LEN argument or zero.
	354	This xfer function does not do partial moves, since child_ops
	355	doesn't allow memory operations to cross below us in the target stack
	356	anyway. */
	357
	358	int
b6de2014	359	child_xfer_memory (memaddr, myaddr, len, write, target)
bd5635a1 RP	360	CORE_ADDR memaddr;
	361	char *myaddr;
	362	int len;
	363	int write;
ee0613d1	364	struct target_ops target; / ignored */
bd5635a1 RP	365	{
	366	register int i;
	367	/* Round starting address down to longword boundary. */
	368	register CORE_ADDR addr = memaddr & - sizeof (int);
	369	/* Round ending address up; get number of longwords that makes. */
	370	register int count
	371	= (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int);
	372	/* Allocate buffer of that many longwords. */
	373	register int buffer = (int ) alloca (count * sizeof (int));
	374
	375	if (write)
	376	{
	377	/* Fill start and end extra bytes of buffer with existing memory data. */
	378
	379	if (addr != memaddr \|\| len < (int)sizeof (int)) {
	380	/* Need part of initial word -- fetch it. */
e676a15f FF	381	buffer[0] = ptrace (PT_READ_I, inferior_pid, (PTRACE_ARG3_TYPE) addr,
e676a15f FF	382	0);
bd5635a1 RP	383	}
	384
	385	if (count > 1) /* FIXME, avoid if even boundary */
	386	{
	387	buffer[count - 1]
	388	= ptrace (PT_READ_I, inferior_pid,
e676a15f FF	389	(PTRACE_ARG3_TYPE) (addr + (count - 1) * sizeof (int)),
e676a15f FF	390	0);
bd5635a1 RP	391	}
	392
	393	/* Copy data to be written over corresponding part of buffer */
	394
a0f9783e	395	memcpy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len);
bd5635a1 RP	396
	397	/* Write the entire buffer. */
	398
	399	for (i = 0; i < count; i++, addr += sizeof (int))
	400	{
	401	errno = 0;
e676a15f FF	402	ptrace (PT_WRITE_D, inferior_pid, (PTRACE_ARG3_TYPE) addr,
e676a15f FF	403	buffer[i]);
bd5635a1 RP	404	if (errno)
	405	{
	406	/* Using the appropriate one (I or D) is necessary for
	407	Gould NP1, at least. */
	408	errno = 0;
e676a15f FF	409	ptrace (PT_WRITE_I, inferior_pid, (PTRACE_ARG3_TYPE) addr,
e676a15f FF	410	buffer[i]);
bd5635a1 RP	411	}
	412	if (errno)
	413	return 0;
	414	}
	415	}
	416	else
	417	{
	418	/* Read all the longwords */
	419	for (i = 0; i < count; i++, addr += sizeof (int))
	420	{
	421	errno = 0;
e676a15f FF	422	buffer[i] = ptrace (PT_READ_I, inferior_pid,
e676a15f FF	423	(PTRACE_ARG3_TYPE) addr, 0);
bd5635a1 RP	424	if (errno)
	425	return 0;
	426	QUIT;
	427	}
	428
	429	/* Copy appropriate bytes out of the buffer. */
a0f9783e	430	memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len);
bd5635a1 RP	431	}
	432	return len;
	433	}