2002-02-05 Daniel Jacobowitz <drow@mvista.com>

        * gdbserver/linux-low.c: New file, copied exactly from low-linux.c.

2 files changed, 781 insertions, 0 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index ce826dc..7ba3727 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,7 @@
+2002-02-05  Daniel Jacobowitz  <drow@mvista.com>
+
+	* gdbserver/linux-low.c: New file, copied exactly from low-linux.c.
+
 2002-02-04  Pierre Muller  <muller@ics.u-strasbg.fr>
 	* win32-nat.c (handle_exception): Handle Ctrl-Break exception.
 
diff --git a/gdb/gdbserver/linux-low.c b/gdb/gdbserver/linux-low.c
new file mode 100644
index 0000000..726e276
--- /dev/null
+++ b/gdb/gdbserver/linux-low.c
@@ -0,0 +1,777 @@
+/* Low level interface to ptrace, for the remote server for GDB.
+   Copyright 1995, 1996, 1998, 1999, 2000, 2001, 2002
+   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., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include "server.h"
+#include <sys/wait.h>
+#include "frame.h"
+#include "inferior.h"
+
+#include <stdio.h>
+#include <sys/param.h>
+#include <sys/dir.h>
+#include <sys/ptrace.h>
+#include <sys/user.h>
+#include <signal.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+
+/***************Begin MY defs*********************/
+static char my_registers[REGISTER_BYTES];
+char *registers = my_registers;
+/***************End MY defs*********************/
+
+#ifdef HAVE_SYS_REG_H
+#include <sys/reg.h>
+#endif
+
+/* Default the type of the ptrace transfer to int.  */
+#ifndef PTRACE_XFER_TYPE
+#define PTRACE_XFER_TYPE int
+#endif
+
+extern int errno;
+
+static void initialize_arch (void);
+
+/* Start an inferior process and returns its pid.
+   ALLARGS is a vector of program-name and args. */
+
+int
+create_inferior (char *program, char **allargs)
+{
+  int pid;
+
+  pid = fork ();
+  if (pid < 0)
+    perror_with_name ("fork");
+
+  if (pid == 0)
+    {
+      ptrace (PTRACE_TRACEME, 0, 0, 0);
+
+      execv (program, allargs);
+
+      fprintf (stderr, "Cannot exec %s: %s.\n", program,
+	       errno < sys_nerr ? sys_errlist[errno] : "unknown error");
+      fflush (stderr);
+      _exit (0177);
+    }
+
+  return pid;
+}
+
+/* Attach to an inferior process.  */
+
+int
+myattach (int pid)
+{
+  if (ptrace (PTRACE_ATTACH, pid, 0, 0) != 0)
+    {
+      fprintf (stderr, "Cannot attach to process %d: %s (%d)\n", pid,
+	       errno < sys_nerr ? sys_errlist[errno] : "unknown error",
+	       errno);
+      fflush (stderr);
+      _exit (0177);
+    }
+
+  return 0;
+}
+
+/* Kill the inferior process.  Make us have no inferior.  */
+
+void
+kill_inferior (void)
+{
+  if (inferior_pid == 0)
+    return;
+  ptrace (PTRACE_KILL, inferior_pid, 0, 0);
+  wait (0);
+/*************inferior_died ();****VK**************/
+}
+
+/* Return nonzero if the given thread is still alive.  */
+int
+mythread_alive (int pid)
+{
+  return 1;
+}
+
+/* Wait for process, returns status */
+
+unsigned char
+mywait (char *status)
+{
+  int pid;
+  union wait w;
+
+  enable_async_io ();
+  pid = waitpid (inferior_pid, &w, 0);
+  disable_async_io ();
+  if (pid != inferior_pid)
+    perror_with_name ("wait");
+
+  if (WIFEXITED (w))
+    {
+      fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w));
+      *status = 'W';
+      return ((unsigned char) WEXITSTATUS (w));
+    }
+  else if (!WIFSTOPPED (w))
+    {
+      fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w));
+      *status = 'X';
+      return ((unsigned char) WTERMSIG (w));
+    }
+
+  fetch_inferior_registers (0);
+
+  *status = 'T';
+  return ((unsigned char) WSTOPSIG (w));
+}
+
+/* Resume execution of the inferior process.
+   If STEP is nonzero, single-step it.
+   If SIGNAL is nonzero, give it that signal.  */
+
+void
+myresume (int step, int signal)
+{
+  errno = 0;
+  ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, inferior_pid, 1, signal);
+  if (errno)
+    perror_with_name ("ptrace");
+}
+
+
+#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
+
+#ifdef I386_GNULINUX_TARGET
+/* This module only supports access to the general purpose registers.
+   Adjust the relevant constants accordingly.
+
+   FIXME: kettenis/2001-03-28: We should really use PTRACE_GETREGS to
+   get at the registers.  Better yet, we should try to share code with
+   i386-linux-nat.c.  */
+#undef NUM_FREGS
+#define NUM_FREGS 0
+#undef NUM_REGS
+#define NUM_REGS NUM_GREGS
+
+/* This stuff comes from i386-tdep.c.  */
+
+/* i386_register_byte[i] is the offset into the register file of the
+   start of register number i.  We initialize this from
+   i386_register_raw_size.  */
+int i386_register_byte[MAX_NUM_REGS];
+
+/* i386_register_raw_size[i] is the number of bytes of storage in
+   GDB's register array occupied by register i.  */
+int i386_register_raw_size[MAX_NUM_REGS] = {
+   4,  4,  4,  4,
+   4,  4,  4,  4,
+   4,  4,  4,  4,
+   4,  4,  4,  4,
+  10, 10, 10, 10,
+  10, 10, 10, 10,
+   4,  4,  4,  4,
+   4,  4,  4,  4,
+  16, 16, 16, 16,
+  16, 16, 16, 16,
+   4
+};
+
+static void
+initialize_arch (void)
+{
+  /* Initialize the table saying where each register starts in the
+     register file.  */
+  {
+    int i, offset;
+
+    offset = 0;
+    for (i = 0; i < MAX_NUM_REGS; i++)
+      {
+	i386_register_byte[i] = offset;
+	offset += i386_register_raw_size[i];
+      }
+  }
+}
+
+/* This stuff comes from i386-linux-nat.c.  */
+
+/* Mapping between the general-purpose registers in `struct user'
+   format and GDB's register array layout.  */
+static int regmap[] = 
+{
+  EAX, ECX, EDX, EBX,
+  UESP, EBP, ESI, EDI,
+  EIP, EFL, CS, SS,
+  DS, ES, FS, GS
+};
+
+/* Return the address of register REGNUM.  BLOCKEND is the value of
+   u.u_ar0, which should point to the registers.  */
+
+CORE_ADDR
+register_u_addr (CORE_ADDR blockend, int regnum)
+{
+  return (blockend + 4 * regmap[regnum]);
+}
+#elif defined(TARGET_M68K)
+static void
+initialize_arch (void)
+{
+  return;
+}
+
+/* This table must line up with REGISTER_NAMES in tm-m68k.h */
+static int regmap[] =
+{
+#ifdef PT_D0
+  PT_D0, PT_D1, PT_D2, PT_D3, PT_D4, PT_D5, PT_D6, PT_D7,
+  PT_A0, PT_A1, PT_A2, PT_A3, PT_A4, PT_A5, PT_A6, PT_USP,
+  PT_SR, PT_PC,
+#else
+  14, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15,
+  17, 18,
+#endif
+#ifdef PT_FP0
+  PT_FP0, PT_FP1, PT_FP2, PT_FP3, PT_FP4, PT_FP5, PT_FP6, PT_FP7,
+  PT_FPCR, PT_FPSR, PT_FPIAR
+#else
+  21, 24, 27, 30, 33, 36, 39, 42, 45, 46, 47
+#endif
+};
+
+/* BLOCKEND is the value of u.u_ar0, and points to the place where GS
+   is stored.  */
+
+int
+m68k_linux_register_u_addr (int blockend, int regnum)
+{
+  return (blockend + 4 * regmap[regnum]);
+}
+#elif defined(IA64_GNULINUX_TARGET)
+#undef NUM_FREGS
+#define NUM_FREGS 0
+
+#include <asm/ptrace_offsets.h>
+
+static int u_offsets[] =
+  {
+    /* general registers */
+    -1,		/* gr0 not available; i.e, it's always zero */
+    PT_R1,
+    PT_R2,
+    PT_R3,
+    PT_R4,
+    PT_R5,
+    PT_R6,
+    PT_R7,
+    PT_R8,
+    PT_R9,
+    PT_R10,
+    PT_R11,
+    PT_R12,
+    PT_R13,
+    PT_R14,
+    PT_R15,
+    PT_R16,
+    PT_R17,
+    PT_R18,
+    PT_R19,
+    PT_R20,
+    PT_R21,
+    PT_R22,
+    PT_R23,
+    PT_R24,
+    PT_R25,
+    PT_R26,
+    PT_R27,
+    PT_R28,
+    PT_R29,
+    PT_R30,
+    PT_R31,
+    /* gr32 through gr127 not directly available via the ptrace interface */
+    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+    /* Floating point registers */
+    -1, -1,	/* f0 and f1 not available (f0 is +0.0 and f1 is +1.0) */
+    PT_F2,
+    PT_F3,
+    PT_F4,
+    PT_F5,
+    PT_F6,
+    PT_F7,
+    PT_F8,
+    PT_F9,
+    PT_F10,
+    PT_F11,
+    PT_F12,
+    PT_F13,
+    PT_F14,
+    PT_F15,
+    PT_F16,
+    PT_F17,
+    PT_F18,
+    PT_F19,
+    PT_F20,
+    PT_F21,
+    PT_F22,
+    PT_F23,
+    PT_F24,
+    PT_F25,
+    PT_F26,
+    PT_F27,
+    PT_F28,
+    PT_F29,
+    PT_F30,
+    PT_F31,
+    PT_F32,
+    PT_F33,
+    PT_F34,
+    PT_F35,
+    PT_F36,
+    PT_F37,
+    PT_F38,
+    PT_F39,
+    PT_F40,
+    PT_F41,
+    PT_F42,
+    PT_F43,
+    PT_F44,
+    PT_F45,
+    PT_F46,
+    PT_F47,
+    PT_F48,
+    PT_F49,
+    PT_F50,
+    PT_F51,
+    PT_F52,
+    PT_F53,
+    PT_F54,
+    PT_F55,
+    PT_F56,
+    PT_F57,
+    PT_F58,
+    PT_F59,
+    PT_F60,
+    PT_F61,
+    PT_F62,
+    PT_F63,
+    PT_F64,
+    PT_F65,
+    PT_F66,
+    PT_F67,
+    PT_F68,
+    PT_F69,
+    PT_F70,
+    PT_F71,
+    PT_F72,
+    PT_F73,
+    PT_F74,
+    PT_F75,
+    PT_F76,
+    PT_F77,
+    PT_F78,
+    PT_F79,
+    PT_F80,
+    PT_F81,
+    PT_F82,
+    PT_F83,
+    PT_F84,
+    PT_F85,
+    PT_F86,
+    PT_F87,
+    PT_F88,
+    PT_F89,
+    PT_F90,
+    PT_F91,
+    PT_F92,
+    PT_F93,
+    PT_F94,
+    PT_F95,
+    PT_F96,
+    PT_F97,
+    PT_F98,
+    PT_F99,
+    PT_F100,
+    PT_F101,
+    PT_F102,
+    PT_F103,
+    PT_F104,
+    PT_F105,
+    PT_F106,
+    PT_F107,
+    PT_F108,
+    PT_F109,
+    PT_F110,
+    PT_F111,
+    PT_F112,
+    PT_F113,
+    PT_F114,
+    PT_F115,
+    PT_F116,
+    PT_F117,
+    PT_F118,
+    PT_F119,
+    PT_F120,
+    PT_F121,
+    PT_F122,
+    PT_F123,
+    PT_F124,
+    PT_F125,
+    PT_F126,
+    PT_F127,
+    /* predicate registers - we don't fetch these individually */
+    -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1,
+    /* branch registers */
+    PT_B0,
+    PT_B1,
+    PT_B2,
+    PT_B3,
+    PT_B4,
+    PT_B5,
+    PT_B6,
+    PT_B7,
+    /* virtual frame pointer and virtual return address pointer */
+    -1, -1,
+    /* other registers */
+    PT_PR,
+    PT_CR_IIP,	/* ip */
+    PT_CR_IPSR, /* psr */
+    PT_CFM,	/* cfm */
+    /* kernel registers not visible via ptrace interface (?) */
+    -1, -1, -1, -1, -1, -1, -1, -1,
+    /* hole */
+    -1, -1, -1, -1, -1, -1, -1, -1,
+    PT_AR_RSC,
+    PT_AR_BSP,
+    PT_AR_BSPSTORE,
+    PT_AR_RNAT,
+    -1,
+    -1,		/* Not available: FCR, IA32 floating control register */
+    -1, -1,
+    -1,		/* Not available: EFLAG */
+    -1,		/* Not available: CSD */
+    -1,		/* Not available: SSD */
+    -1,		/* Not available: CFLG */
+    -1,		/* Not available: FSR */
+    -1,		/* Not available: FIR */
+    -1,		/* Not available: FDR */
+    -1,
+    PT_AR_CCV,
+    -1, -1, -1,
+    PT_AR_UNAT,
+    -1, -1, -1,
+    PT_AR_FPSR,
+    -1, -1, -1,
+    -1,		/* Not available: ITC */
+    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1, -1,
+    PT_AR_PFS,
+    PT_AR_LC,
+    -1,		/* Not available: EC, the Epilog Count register */
+    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+    -1,
+    /* nat bits - not fetched directly; instead we obtain these bits from
+       either rnat or unat or from memory. */
+    -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1,
+    -1, -1, -1, -1, -1, -1, -1, -1,
+  };
+
+int
+ia64_register_u_addr (int blockend, int regnum)
+{
+  int addr;
+
+  if (regnum < 0 || regnum >= NUM_REGS)
+    error ("Invalid register number %d.", regnum);
+
+  addr = u_offsets[regnum];
+  if (addr == -1)
+    addr = 0;
+
+  return addr;
+}
+
+static void
+initialize_arch (void)
+{
+  return;
+}
+
+#elif defined(ARM_GNULINUX_TARGET)
+int arm_register_u_addr(blockend, regnum)
+     int blockend;
+     int regnum;
+{
+  return blockend + REGISTER_BYTE(regnum);  
+}
+
+static void
+initialize_arch ()
+{
+}
+#endif
+
+CORE_ADDR
+register_addr (int regno, CORE_ADDR blockend)
+{
+  CORE_ADDR addr;
+
+  if (regno < 0 || regno >= NUM_REGS)
+    error ("Invalid register number %d.", regno);
+
+  REGISTER_U_ADDR (addr, blockend, regno);
+
+  return addr;
+}
+
+/* Fetch one register.  */
+
+static void
+fetch_register (int regno)
+{
+  CORE_ADDR regaddr;
+  register int i;
+
+  /* Offset of registers within the u area.  */
+  unsigned int offset;
+
+  offset = U_REGS_OFFSET;
+
+  regaddr = register_addr (regno, offset);
+  for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (PTRACE_XFER_TYPE))
+    {
+      errno = 0;
+      *(PTRACE_XFER_TYPE *) &registers[REGISTER_BYTE (regno) + i] =
+	ptrace (PTRACE_PEEKUSER, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, 0);
+      regaddr += sizeof (PTRACE_XFER_TYPE);
+      if (errno != 0)
+	{
+	  /* Warning, not error, in case we are attached; sometimes the
+	     kernel doesn't let us at the registers.  */
+	  char *err = strerror (errno);
+	  char *msg = alloca (strlen (err) + 128);
+	  sprintf (msg, "reading register %d: %s", regno, err);
+	  error (msg);
+	  goto error_exit;
+	}
+    }
+error_exit:;
+}
+
+/* Fetch all registers, or just one, from the child process.  */
+
+void
+fetch_inferior_registers (int regno)
+{
+  if (regno == -1 || regno == 0)
+    for (regno = 0; regno < NUM_REGS - NUM_FREGS; regno++)
+      fetch_register (regno);
+  else
+    fetch_register (regno);
+}
+
+/* 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 (int regno)
+{
+  CORE_ADDR regaddr;
+  int i;
+  unsigned int offset = U_REGS_OFFSET;
+
+  if (regno >= 0)
+    {
+#if 0
+      if (CANNOT_STORE_REGISTER (regno))
+	return;
+#endif
+      regaddr = register_addr (regno, offset);
+      errno = 0;
+#if 0
+      if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM)
+	{
+	  scratch = *(int *) &registers[REGISTER_BYTE (regno)] | 0x3;
+	  ptrace (PT_WUREGS, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
+		  scratch, 0);
+	  if (errno != 0)
+	    {
+	      /* Error, even if attached.  Failing to write these two
+	         registers is pretty serious.  */
+	      sprintf (buf, "writing register number %d", regno);
+	      perror_with_name (buf);
+	    }
+	}
+      else
+#endif
+	for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
+	  {
+	    errno = 0;
+	    ptrace (PTRACE_POKEUSER, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
+		    *(int *) &registers[REGISTER_BYTE (regno) + i]);
+	    if (errno != 0)
+	      {
+		/* Warning, not error, in case we are attached; sometimes the
+		   kernel doesn't let us at the registers.  */
+		char *err = strerror (errno);
+		char *msg = alloca (strlen (err) + 128);
+		sprintf (msg, "writing register %d: %s",
+			 regno, err);
+		error (msg);
+		return;
+	      }
+	    regaddr += sizeof (int);
+	  }
+    }
+  else
+    for (regno = 0; regno < NUM_REGS - NUM_FREGS; regno++)
+      store_inferior_registers (regno);
+}
+
+/* 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 from inferior's memory starting at MEMADDR
+   to debugger memory starting at MYADDR.  */
+
+void
+read_inferior_memory (CORE_ADDR memaddr, char *myaddr, int len)
+{
+  register int i;
+  /* Round starting address down to longword boundary.  */
+  register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE);
+  /* Round ending address up; get number of longwords that makes.  */
+  register int count 
+    = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) 
+      / sizeof (PTRACE_XFER_TYPE);
+  /* Allocate buffer of that many longwords.  */
+  register PTRACE_XFER_TYPE *buffer 
+    = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE));
+
+  /* Read all the longwords */
+  for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE))
+    {
+      buffer[i] = ptrace (PTRACE_PEEKTEXT, inferior_pid, addr, 0);
+    }
+
+  /* Copy appropriate bytes out of the buffer.  */
+  memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), len);
+}
+
+/* Copy LEN bytes of data from debugger memory at MYADDR
+   to inferior's memory at MEMADDR.
+   On failure (cannot write the inferior)
+   returns the value of errno.  */
+
+int
+write_inferior_memory (CORE_ADDR memaddr, char *myaddr, int len)
+{
+  register int i;
+  /* Round starting address down to longword boundary.  */
+  register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE);
+  /* Round ending address up; get number of longwords that makes.  */
+  register int count
+  = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) / sizeof (PTRACE_XFER_TYPE);
+  /* Allocate buffer of that many longwords.  */
+  register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE));
+  extern int errno;
+
+  /* Fill start and end extra bytes of buffer with existing memory data.  */
+
+  buffer[0] = ptrace (PTRACE_PEEKTEXT, inferior_pid, addr, 0);
+
+  if (count > 1)
+    {
+      buffer[count - 1]
+	= ptrace (PTRACE_PEEKTEXT, inferior_pid,
+		  addr + (count - 1) * sizeof (PTRACE_XFER_TYPE), 0);
+    }
+
+  /* Copy data to be written over corresponding part of buffer */
+
+  memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), myaddr, len);
+
+  /* Write the entire buffer.  */
+
+  for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE))
+    {
+      errno = 0;
+      ptrace (PTRACE_POKETEXT, inferior_pid, addr, buffer[i]);
+      if (errno)
+	return errno;
+    }
+
+  return 0;
+}
+
+void
+initialize_low (void)
+{
+  initialize_arch ();
+}