Initial creation of sourceware repository

1 files changed, 0 insertions, 1553 deletions

diff --git a/gdb/findvar.c b/gdb/findvar.c
deleted file mode 100644
index 298abf7..0000000
--- a/gdb/findvar.c
+++ /dev/null
@@ -1,1553 +0,0 @@
-/* Find a variable's value in memory, for GDB, the GNU debugger.
-   Copyright 1986, 87, 89, 91, 94, 95, 96, 1998
-   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 "defs.h"
-#include "symtab.h"
-#include "gdbtypes.h"
-#include "frame.h"
-#include "value.h"
-#include "gdbcore.h"
-#include "inferior.h"
-#include "target.h"
-#include "gdb_string.h"
-#include "floatformat.h"
-#include "symfile.h"	/* for overlay functions */
-
-/* This is used to indicate that we don't know the format of the floating point
-   number.  Typically, this is useful for native ports, where the actual format
-   is irrelevant, since no conversions will be taking place.  */
-
-const struct floatformat floatformat_unknown;
-
-/* Registers we shouldn't try to store.  */
-#if !defined (CANNOT_STORE_REGISTER)
-#define CANNOT_STORE_REGISTER(regno) 0
-#endif
-
-static void
-write_register_gen PARAMS ((int, char *));
-
-/* Basic byte-swapping routines.  GDB has needed these for a long time...
-   All extract a target-format integer at ADDR which is LEN bytes long.  */
-
-#if TARGET_CHAR_BIT != 8 || HOST_CHAR_BIT != 8
-  /* 8 bit characters are a pretty safe assumption these days, so we
-     assume it throughout all these swapping routines.  If we had to deal with
-     9 bit characters, we would need to make len be in bits and would have
-     to re-write these routines...  */
-  you lose
-#endif
-
-LONGEST
-extract_signed_integer (addr, len)
-     PTR addr;
-     int len;
-{
-  LONGEST retval;
-  unsigned char *p;
-  unsigned char *startaddr = (unsigned char *)addr;
-  unsigned char *endaddr = startaddr + len;
-
-  if (len > (int) sizeof (LONGEST))
-    error ("\
-That operation is not available on integers of more than %d bytes.",
-	   sizeof (LONGEST));
-
-  /* Start at the most significant end of the integer, and work towards
-     the least significant.  */
-  if (TARGET_BYTE_ORDER == BIG_ENDIAN)
-    {
-      p = startaddr;
-      /* Do the sign extension once at the start.  */
-      retval = ((LONGEST)*p ^ 0x80) - 0x80;
-      for (++p; p < endaddr; ++p)
-	retval = (retval << 8) | *p;
-    }
-  else
-    {
-      p = endaddr - 1;
-      /* Do the sign extension once at the start.  */
-      retval = ((LONGEST)*p ^ 0x80) - 0x80;
-      for (--p; p >= startaddr; --p)
-	retval = (retval << 8) | *p;
-    }
-  return retval;
-}
-
-ULONGEST
-extract_unsigned_integer (addr, len)
-     PTR addr;
-     int len;
-{
-  ULONGEST retval;
-  unsigned char *p;
-  unsigned char *startaddr = (unsigned char *)addr;
-  unsigned char *endaddr = startaddr + len;
-
-  if (len > (int) sizeof (ULONGEST))
-    error ("\
-That operation is not available on integers of more than %d bytes.",
-	   sizeof (ULONGEST));
-
-  /* Start at the most significant end of the integer, and work towards
-     the least significant.  */
-  retval = 0;
-  if (TARGET_BYTE_ORDER == BIG_ENDIAN)
-    {
-      for (p = startaddr; p < endaddr; ++p)
-	retval = (retval << 8) | *p;
-    }
-  else
-    {
-      for (p = endaddr - 1; p >= startaddr; --p)
-	retval = (retval << 8) | *p;
-    }
-  return retval;
-}
-
-/* Sometimes a long long unsigned integer can be extracted as a
-   LONGEST value.  This is done so that we can print these values
-   better.  If this integer can be converted to a LONGEST, this
-   function returns 1 and sets *PVAL.  Otherwise it returns 0.  */
-
-int
-extract_long_unsigned_integer (addr, orig_len, pval)
-     PTR addr;
-     int orig_len;
-     LONGEST *pval;
-{
-  char *p, *first_addr;
-  int len;
-
-  len = orig_len;
-  if (TARGET_BYTE_ORDER == BIG_ENDIAN)
-    {
-      for (p = (char *) addr;
-	   len > (int) sizeof (LONGEST) && p < (char *) addr + orig_len;
-	   p++)
-	{
-	  if (*p == 0)
-	    len--;
-	  else
-	    break;
-	}
-      first_addr = p;
-    }
-  else
-    {
-      first_addr = (char *) addr;
-      for (p = (char *) addr + orig_len - 1;
-	   len > (int) sizeof (LONGEST) && p >= (char *) addr;
-	   p--)
-	{
-	  if (*p == 0)
-	    len--;
-	  else
-	    break;
-	}
-    }
-
-  if (len <= (int) sizeof (LONGEST))
-    {
-      *pval = (LONGEST) extract_unsigned_integer (first_addr,
-						  sizeof (LONGEST));
-      return 1;
-    }
-
-  return 0;
-}
-
-CORE_ADDR
-extract_address (addr, len)
-     PTR addr;
-     int len;
-{
-  /* Assume a CORE_ADDR can fit in a LONGEST (for now).  Not sure
-     whether we want this to be true eventually.  */
-  return extract_unsigned_integer (addr, len);
-}
-
-void
-store_signed_integer (addr, len, val)
-     PTR addr;
-     int len;
-     LONGEST val;
-{
-  unsigned char *p;
-  unsigned char *startaddr = (unsigned char *)addr;
-  unsigned char *endaddr = startaddr + len;
-
-  /* Start at the least significant end of the integer, and work towards
-     the most significant.  */
-  if (TARGET_BYTE_ORDER == BIG_ENDIAN)
-    {
-      for (p = endaddr - 1; p >= startaddr; --p)
-	{
-	  *p = val & 0xff;
-	  val >>= 8;
-	}
-    }
-  else
-    {
-      for (p = startaddr; p < endaddr; ++p)
-	{
-	  *p = val & 0xff;
-	  val >>= 8;
-	}
-    }
-}
-
-void
-store_unsigned_integer (addr, len, val)
-     PTR addr;
-     int len;
-     ULONGEST val;
-{
-  unsigned char *p;
-  unsigned char *startaddr = (unsigned char *)addr;
-  unsigned char *endaddr = startaddr + len;
-
-  /* Start at the least significant end of the integer, and work towards
-     the most significant.  */
-  if (TARGET_BYTE_ORDER == BIG_ENDIAN)
-    {
-      for (p = endaddr - 1; p >= startaddr; --p)
-	{
-	  *p = val & 0xff;
-	  val >>= 8;
-	}
-    }
-  else
-    {
-      for (p = startaddr; p < endaddr; ++p)
-	{
-	  *p = val & 0xff;
-	  val >>= 8;
-	}
-    }
-}
-
-void
-store_address (addr, len, val)
-     PTR addr;
-     int len;
-     CORE_ADDR val;
-{
-  /* Assume a CORE_ADDR can fit in a LONGEST (for now).  Not sure
-     whether we want this to be true eventually.  */
-  store_unsigned_integer (addr, len, (LONGEST)val);
-}
-
-/* Swap LEN bytes at BUFFER between target and host byte-order.  */
-#define SWAP_FLOATING(buffer,len) \
-  do                                                                    \
-    {                                                                   \
-      if (TARGET_BYTE_ORDER != HOST_BYTE_ORDER)                         \
-        {                                                               \
-          char tmp;                                                     \
-          char *p = (char *)(buffer);                                   \
-          char *q = ((char *)(buffer)) + len - 1;                       \
-          for (; p < q; p++, q--)                                       \
-            {                                                           \
-              tmp = *q;                                                 \
-              *q = *p;                                                  \
-              *p = tmp;                                                 \
-            }                                                           \
-        }                                                               \
-    }                                                                   \
-  while (0)
-
-/* Extract a floating-point number from a target-order byte-stream at ADDR.
-   Returns the value as type DOUBLEST.
-
-   If the host and target formats agree, we just copy the raw data into the
-   appropriate type of variable and return, letting the host increase precision
-   as necessary.  Otherwise, we call the conversion routine and let it do the
-   dirty work.  */
-
-DOUBLEST
-extract_floating (addr, len)
-     PTR addr;
-     int len;
-{
-  DOUBLEST dretval;
-
-  if (len == sizeof (float))
-    {
-      if (HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT)
-	{
-	  float retval;
-
-	  memcpy (&retval, addr, sizeof (retval));
-	  return retval;
-	}
-      else
-	floatformat_to_doublest (TARGET_FLOAT_FORMAT, addr, &dretval);
-    }
-  else if (len == sizeof (double))
-    {
-      if (HOST_DOUBLE_FORMAT == TARGET_DOUBLE_FORMAT)
-	{
-	  double retval;
-
-	  memcpy (&retval, addr, sizeof (retval));
-	  return retval;
-	}
-      else
-	floatformat_to_doublest (TARGET_DOUBLE_FORMAT, addr, &dretval);
-    }
-  else if (len == sizeof (DOUBLEST))
-    {
-      if (HOST_LONG_DOUBLE_FORMAT == TARGET_LONG_DOUBLE_FORMAT)
-	{
-	  DOUBLEST retval;
-
-	  memcpy (&retval, addr, sizeof (retval));
-	  return retval;
-	}
-      else
-	floatformat_to_doublest (TARGET_LONG_DOUBLE_FORMAT, addr, &dretval);
-    }
-  else
-    {
-      error ("Can't deal with a floating point number of %d bytes.", len);
-    }
-
-  return dretval;
-}
-
-void
-store_floating (addr, len, val)
-     PTR addr;
-     int len;
-     DOUBLEST val;
-{
-  if (len == sizeof (float))
-    {
-      if (HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT)
-	{
-	  float floatval = val;
-
-	  memcpy (addr, &floatval, sizeof (floatval));
-	}
-      else
-	floatformat_from_doublest (TARGET_FLOAT_FORMAT, &val, addr);
-    }
-  else if (len == sizeof (double))
-    {
-      if (HOST_DOUBLE_FORMAT == TARGET_DOUBLE_FORMAT)
-	{
-	  double doubleval = val;
-
-	  memcpy (addr, &doubleval, sizeof (doubleval));
-	}
-      else
-	floatformat_from_doublest (TARGET_DOUBLE_FORMAT, &val, addr);
-    }
-  else if (len == sizeof (DOUBLEST))
-    {
-      if (HOST_LONG_DOUBLE_FORMAT == TARGET_LONG_DOUBLE_FORMAT)
-	memcpy (addr, &val, sizeof (val));
-      else
-	floatformat_from_doublest (TARGET_LONG_DOUBLE_FORMAT, &val, addr);
-    }
-  else
-    {
-      error ("Can't deal with a floating point number of %d bytes.", len);
-    }
-}
-
-#if !defined (GET_SAVED_REGISTER)
-
-/* Return the address in which frame FRAME's value of register REGNUM
-   has been saved in memory.  Or return zero if it has not been saved.
-   If REGNUM specifies the SP, the value we return is actually
-   the SP value, not an address where it was saved.  */
-
-CORE_ADDR
-find_saved_register (frame, regnum)
-     struct frame_info *frame;
-     int regnum;
-{
-  struct frame_saved_regs saved_regs;
-
-  register struct frame_info *frame1 = NULL;
-  register CORE_ADDR addr = 0;
-
-  if (frame == NULL)		/* No regs saved if want current frame */
-    return 0;
-
-#ifdef HAVE_REGISTER_WINDOWS
-  /* We assume that a register in a register window will only be saved
-     in one place (since the name changes and/or disappears as you go
-     towards inner frames), so we only call get_frame_saved_regs on
-     the current frame.  This is directly in contradiction to the
-     usage below, which assumes that registers used in a frame must be
-     saved in a lower (more interior) frame.  This change is a result
-     of working on a register window machine; get_frame_saved_regs
-     always returns the registers saved within a frame, within the
-     context (register namespace) of that frame. */
-
-  /* However, note that we don't want this to return anything if
-     nothing is saved (if there's a frame inside of this one).  Also,
-     callers to this routine asking for the stack pointer want the
-     stack pointer saved for *this* frame; this is returned from the
-     next frame.  */
-     
-  if (REGISTER_IN_WINDOW_P(regnum))
-    {
-      frame1 = get_next_frame (frame);
-      if (!frame1) return 0;	/* Registers of this frame are active.  */
-      
-      /* Get the SP from the next frame in; it will be this
-	 current frame.  */
-      if (regnum != SP_REGNUM)
-	frame1 = frame;	
-	  
-      get_frame_saved_regs (frame1, &saved_regs);
-      return saved_regs.regs[regnum];	/* ... which might be zero */
-    }
-#endif /* HAVE_REGISTER_WINDOWS */
-
-  /* Note that this next routine assumes that registers used in
-     frame x will be saved only in the frame that x calls and
-     frames interior to it.  This is not true on the sparc, but the
-     above macro takes care of it, so we should be all right. */
-  while (1)
-    {
-      QUIT;
-      frame1 = get_prev_frame (frame1);
-      if (frame1 == 0 || frame1 == frame)
-	break;
-      get_frame_saved_regs (frame1, &saved_regs);
-      if (saved_regs.regs[regnum])
-	addr = saved_regs.regs[regnum];
-    }
-
-  return addr;
-}
-
-/* Find register number REGNUM relative to FRAME and put its (raw,
-   target format) contents in *RAW_BUFFER.  Set *OPTIMIZED if the
-   variable was optimized out (and thus can't be fetched).  Set *LVAL
-   to lval_memory, lval_register, or not_lval, depending on whether
-   the value was fetched from memory, from a register, or in a strange
-   and non-modifiable way (e.g. a frame pointer which was calculated
-   rather than fetched).  Set *ADDRP to the address, either in memory
-   on as a REGISTER_BYTE offset into the registers array.
-
-   Note that this implementation never sets *LVAL to not_lval.  But
-   it can be replaced by defining GET_SAVED_REGISTER and supplying
-   your own.
-
-   The argument RAW_BUFFER must point to aligned memory.  */
-
-void
-get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval)
-     char *raw_buffer;
-     int *optimized;
-     CORE_ADDR *addrp;
-     struct frame_info *frame;
-     int regnum;
-     enum lval_type *lval;
-{
-  CORE_ADDR addr;
-
-  if (!target_has_registers)
-    error ("No registers.");
-
-  /* Normal systems don't optimize out things with register numbers.  */
-  if (optimized != NULL)
-    *optimized = 0;
-  addr = find_saved_register (frame, regnum);
-  if (addr != 0)
-    {
-      if (lval != NULL)
-	*lval = lval_memory;
-      if (regnum == SP_REGNUM)
-	{
-	  if (raw_buffer != NULL)
-	    {
-	      /* Put it back in target format.  */
-	      store_address (raw_buffer, REGISTER_RAW_SIZE (regnum), addr);
-	    }
-	  if (addrp != NULL)
-	    *addrp = 0;
-	  return;
-	}
-      if (raw_buffer != NULL)
-	read_memory (addr, raw_buffer, REGISTER_RAW_SIZE (regnum));
-    }
-  else
-    {
-      if (lval != NULL)
-	*lval = lval_register;
-      addr = REGISTER_BYTE (regnum);
-      if (raw_buffer != NULL)
-	read_register_gen (regnum, raw_buffer);
-    }
-  if (addrp != NULL)
-    *addrp = addr;
-}
-#endif /* GET_SAVED_REGISTER.  */
-
-/* Copy the bytes of register REGNUM, relative to the current stack frame,
-   into our memory at MYADDR, in target byte order.
-   The number of bytes copied is REGISTER_RAW_SIZE (REGNUM).
-
-   Returns 1 if could not be read, 0 if could.  */
-
-int
-read_relative_register_raw_bytes (regnum, myaddr)
-     int regnum;
-     char *myaddr;
-{
-  int optim;
-  if (regnum == FP_REGNUM && selected_frame)
-    {
-      /* Put it back in target format.  */
-      store_address (myaddr, REGISTER_RAW_SIZE(FP_REGNUM),
-		     FRAME_FP(selected_frame));
-      return 0;
-    }
-
-  get_saved_register (myaddr, &optim, (CORE_ADDR *) NULL, selected_frame,
-                      regnum, (enum lval_type *)NULL);
-
-  if (register_valid [regnum] < 0)
-    return 1;	/* register value not available */
-
-  return optim;
-}
-
-/* Return a `value' with the contents of register REGNUM
-   in its virtual format, with the type specified by
-   REGISTER_VIRTUAL_TYPE.  
-
-   NOTE: returns NULL if register value is not available.
-   Caller will check return value or die!  */
-
-value_ptr
-value_of_register (regnum)
-     int regnum;
-{
-  CORE_ADDR addr;
-  int optim;
-  register value_ptr reg_val;
-  char raw_buffer[MAX_REGISTER_RAW_SIZE];
-  enum lval_type lval;
-
-  get_saved_register (raw_buffer, &optim, &addr,
-		      selected_frame, regnum, &lval);
-
-  if (register_valid[regnum] < 0)
-    return NULL;	/* register value not available */
-
-  reg_val = allocate_value (REGISTER_VIRTUAL_TYPE (regnum));
-
-  /* Convert raw data to virtual format if necessary.  */
-
-#ifdef REGISTER_CONVERTIBLE
-  if (REGISTER_CONVERTIBLE (regnum))
-    {
-      REGISTER_CONVERT_TO_VIRTUAL (regnum, REGISTER_VIRTUAL_TYPE (regnum),
-				   raw_buffer, VALUE_CONTENTS_RAW (reg_val));
-    }
-  else
-#endif
-    if (REGISTER_RAW_SIZE (regnum) == REGISTER_VIRTUAL_SIZE (regnum))
-      memcpy (VALUE_CONTENTS_RAW (reg_val), raw_buffer,
-	      REGISTER_RAW_SIZE (regnum));
-    else
-      fatal ("Register \"%s\" (%d) has conflicting raw (%d) and virtual (%d) size",
-	     REGISTER_NAME (regnum), regnum,
-	     REGISTER_RAW_SIZE (regnum), REGISTER_VIRTUAL_SIZE (regnum));
-  VALUE_LVAL (reg_val) = lval;
-  VALUE_ADDRESS (reg_val) = addr;
-  VALUE_REGNO (reg_val) = regnum;
-  VALUE_OPTIMIZED_OUT (reg_val) = optim;
-  return reg_val;
-}
-
-/* Low level examining and depositing of registers.
-
-   The caller is responsible for making
-   sure that the inferior is stopped before calling the fetching routines,
-   or it will get garbage.  (a change from GDB version 3, in which
-   the caller got the value from the last stop).  */
-
-/* Contents of the registers in target byte order.
-   We allocate some extra slop since we do a lot of memcpy's around 
-   `registers', and failing-soft is better than failing hard.  */
-
-char registers[REGISTER_BYTES + /* SLOP */ 256];
-
-/* Nonzero if that register has been fetched,
-   -1 if register value not available. */
-SIGNED char register_valid[NUM_REGS];
-
-/* The thread/process associated with the current set of registers.  For now,
-   -1 is special, and means `no current process'.  */
-int registers_pid = -1;
-
-/* Indicate that registers may have changed, so invalidate the cache.  */
-
-void
-registers_changed ()
-{
-  int i;
-  int numregs = ARCH_NUM_REGS;
-
-  registers_pid = -1;
-
-  /* Force cleanup of any alloca areas if using C alloca instead of
-     a builtin alloca.  This particular call is used to clean up
-     areas allocated by low level target code which may build up
-     during lengthy interactions between gdb and the target before
-     gdb gives control to the user (ie watchpoints).  */
-  alloca (0);
-
-  for (i = 0; i < numregs; i++)
-    register_valid[i] = 0;
-
-  if (registers_changed_hook)
-    registers_changed_hook ();
-}
-
-/* Indicate that all registers have been fetched, so mark them all valid.  */
-void
-registers_fetched ()
-{
-  int i;
-  int numregs = ARCH_NUM_REGS;
-  for (i = 0; i < numregs; i++)
-    register_valid[i] = 1;
-}
-
-/* read_register_bytes and write_register_bytes are generally a *BAD* idea.
-   They are inefficient because they need to check for partial updates, which
-   can only be done by scanning through all of the registers and seeing if the
-   bytes that are being read/written fall inside of an invalid register.  [The
-    main reason this is necessary is that register sizes can vary, so a simple
-    index won't suffice.]  It is far better to call read_register_gen if you
-   want to get at the raw register contents, as it only takes a regno as an
-   argument, and therefore can't do a partial register update.  It would also
-   be good to have a write_register_gen for similar reasons.
-
-   Prior to the recent fixes to check for partial updates, both read and
-   write_register_bytes always checked to see if any registers were stale, and
-   then called target_fetch_registers (-1) to update the whole set.  This
-   caused really slowed things down for remote targets.  */
-
-/* Copy INLEN bytes of consecutive data from registers
-   starting with the INREGBYTE'th byte of register data
-   into memory at MYADDR.  */
-
-void
-read_register_bytes (inregbyte, myaddr, inlen)
-     int inregbyte;
-     char *myaddr;
-     int inlen;
-{
-  int inregend = inregbyte + inlen;
-  int regno;
-
-  if (registers_pid != inferior_pid)
-    {
-      registers_changed ();
-      registers_pid = inferior_pid;
-    }
-
-  /* See if we are trying to read bytes from out-of-date registers.  If so,
-     update just those registers.  */
-
-  for (regno = 0; regno < NUM_REGS; regno++)
-    {
-      int regstart, regend;
-      int startin, endin;
-
-      if (register_valid[regno])
-	continue;
-
-      if (REGISTER_NAME (regno) == NULL || *REGISTER_NAME (regno) == '\0')
-	continue;
-
-      regstart = REGISTER_BYTE (regno);
-      regend = regstart + REGISTER_RAW_SIZE (regno);
-
-      startin = regstart >= inregbyte && regstart < inregend;
-      endin = regend > inregbyte && regend <= inregend;
-
-      if (!startin && !endin)
-	continue;
-
-      /* We've found an invalid register where at least one byte will be read.
-	 Update it from the target.  */
-
-      target_fetch_registers (regno);
-
-      if (!register_valid[regno])
-	error ("read_register_bytes:  Couldn't update register %d.", regno);
-    }
-
-  if (myaddr != NULL)
-    memcpy (myaddr, &registers[inregbyte], inlen);
-}
-
-/* Read register REGNO into memory at MYADDR, which must be large enough
-   for REGISTER_RAW_BYTES (REGNO).  Target byte-order.
-   If the register is known to be the size of a CORE_ADDR or smaller,
-   read_register can be used instead.  */
-void
-read_register_gen (regno, myaddr)
-     int regno;
-     char *myaddr;
-{
-  if (registers_pid != inferior_pid)
-    {
-      registers_changed ();
-      registers_pid = inferior_pid;
-    }
-
-  if (!register_valid[regno])
-    target_fetch_registers (regno);
-  memcpy (myaddr, &registers[REGISTER_BYTE (regno)],
-	  REGISTER_RAW_SIZE (regno));
-}
-
-/* Write register REGNO at MYADDR to the target.  MYADDR points at
-   REGISTER_RAW_BYTES(REGNO), which must be in target byte-order.  */
-
-static void
-write_register_gen (regno, myaddr)
-     int regno;
-     char *myaddr;
-{
-  int size;
-
-  /* On the sparc, writing %g0 is a no-op, so we don't even want to change
-     the registers array if something writes to this register.  */
-  if (CANNOT_STORE_REGISTER (regno))
-    return;
-
-  if (registers_pid != inferior_pid)
-    {
-      registers_changed ();
-      registers_pid = inferior_pid;
-    }
-
-  size = REGISTER_RAW_SIZE(regno);
-
-  /* If we have a valid copy of the register, and new value == old value,
-     then don't bother doing the actual store. */
-
-  if (register_valid [regno]
-      && memcmp (&registers[REGISTER_BYTE (regno)], myaddr, size) == 0)
-    return;
-  
-  target_prepare_to_store ();
-
-  memcpy (&registers[REGISTER_BYTE (regno)], myaddr, size);
-
-  register_valid [regno] = 1;
-
-  target_store_registers (regno);
-
-  if (regno == PC_REGNUM && pc_changed_hook)
-    pc_changed_hook ();
-}
-
-/* Copy INLEN bytes of consecutive data from memory at MYADDR
-   into registers starting with the MYREGSTART'th byte of register data.  */
-
-void
-write_register_bytes (myregstart, myaddr, inlen)
-     int myregstart;
-     char *myaddr;
-     int inlen;
-{
-  int myregend = myregstart + inlen;
-  int regno;
-
-  target_prepare_to_store ();
-
-  /* Scan through the registers updating any that are covered by the range
-     myregstart<=>myregend using write_register_gen, which does nice things
-     like handling threads, and avoiding updates when the new and old contents
-     are the same.  */
-
-  for (regno = 0; regno < NUM_REGS; regno++)
-    {
-      int regstart, regend;
-      int startin, endin;
-      char regbuf[MAX_REGISTER_RAW_SIZE];
-
-      regstart = REGISTER_BYTE (regno);
-      regend = regstart + REGISTER_RAW_SIZE (regno);
-
-      startin = regstart >= myregstart && regstart < myregend;
-      endin = regend > myregstart && regend <= myregend;
-
-      if (!startin && !endin)
-	continue;		/* Register is completely out of range */
-
-      if (startin && endin)	/* register is completely in range */
-	{
-	  write_register_gen (regno, myaddr + (regstart - myregstart));
-	  continue;
-	}
-
-      /* We may be doing a partial update of an invalid register.  Update it
-	 from the target before scribbling on it.  */
-      read_register_gen (regno, regbuf);
-
-      if (startin)
-	memcpy (registers + regstart,
-		myaddr + regstart - myregstart,
-		myregend - regstart);
-      else			/* endin */
-	memcpy (registers + myregstart,
-		myaddr,
-		regend - myregstart);
-      target_store_registers (regno);
-    }
-}
-
-/* Return the raw contents of register REGNO, regarding it as an integer.  */
-/* This probably should be returning LONGEST rather than CORE_ADDR.  */
-
-CORE_ADDR
-read_register (regno)
-     int regno;
-{
-  if (registers_pid != inferior_pid)
-    {
-      registers_changed ();
-      registers_pid = inferior_pid;
-    }
-
-  if (!register_valid[regno])
-    target_fetch_registers (regno);
-
-  return extract_address (&registers[REGISTER_BYTE (regno)],
-			  REGISTER_RAW_SIZE(regno));
-}
-
-CORE_ADDR
-read_register_pid (regno, pid)
-     int regno, pid;
-{
-  int save_pid;
-  CORE_ADDR retval;
-
-  if (pid == inferior_pid)
-    return read_register (regno);
-
-  save_pid = inferior_pid;
-
-  inferior_pid = pid;
-
-  retval = read_register (regno);
-
-  inferior_pid = save_pid;
-
-  return retval;
-}
-
-/* Store VALUE, into the raw contents of register number REGNO.  */
-
-void
-write_register (regno, val)
-     int regno;
-     LONGEST val;
-{
-  PTR buf;
-  int size;
-
-  /* On the sparc, writing %g0 is a no-op, so we don't even want to change
-     the registers array if something writes to this register.  */
-  if (CANNOT_STORE_REGISTER (regno))
-    return;
-
-  if (registers_pid != inferior_pid)
-    {
-      registers_changed ();
-      registers_pid = inferior_pid;
-    }
-
-  size = REGISTER_RAW_SIZE(regno);
-  buf = alloca (size);
-  store_signed_integer (buf, size, (LONGEST) val);
-
-  /* If we have a valid copy of the register, and new value == old value,
-     then don't bother doing the actual store. */
-
-  if (register_valid [regno]
-      && memcmp (&registers[REGISTER_BYTE (regno)], buf, size) == 0)
-    return;
-  
-  target_prepare_to_store ();
-
-  memcpy (&registers[REGISTER_BYTE (regno)], buf, size);
-
-  register_valid [regno] = 1;
-
-  target_store_registers (regno);
-}
-
-void
-write_register_pid (regno, val, pid)
-     int regno;
-     LONGEST val;
-     int pid;
-{
-  int save_pid;
-
-  if (pid == inferior_pid)
-    {
-      write_register (regno, val);
-      return;
-    }
-
-  save_pid = inferior_pid;
-
-  inferior_pid = pid;
-
-  write_register (regno, val);
-
-  inferior_pid = save_pid;
-}
-
-/* Record that register REGNO contains VAL.
-   This is used when the value is obtained from the inferior or core dump,
-   so there is no need to store the value there.
-
-   If VAL is a NULL pointer, then it's probably an unsupported register.  We
-   just set it's value to all zeros.  We might want to record this fact, and
-   report it to the users of read_register and friends.
-*/
-
-void
-supply_register (regno, val)
-     int regno;
-     char *val;
-{
-#if 1
-  if (registers_pid != inferior_pid)
-    {
-      registers_changed ();
-      registers_pid = inferior_pid;
-    }
-#endif
-
-  register_valid[regno] = 1;
-  if (val)
-    memcpy (&registers[REGISTER_BYTE (regno)], val, REGISTER_RAW_SIZE (regno));
-  else
-    memset (&registers[REGISTER_BYTE (regno)], '\000', REGISTER_RAW_SIZE (regno));
-
-  /* On some architectures, e.g. HPPA, there are a few stray bits in some
-     registers, that the rest of the code would like to ignore.  */
-#ifdef CLEAN_UP_REGISTER_VALUE
-  CLEAN_UP_REGISTER_VALUE(regno, &registers[REGISTER_BYTE(regno)]);
-#endif
-}
-
-
-/* This routine is getting awfully cluttered with #if's.  It's probably
-   time to turn this into READ_PC and define it in the tm.h file.
-   Ditto for write_pc.  */
-
-CORE_ADDR
-read_pc_pid (pid)
-     int pid;
-{
-#ifdef TARGET_READ_PC
-  return TARGET_READ_PC (pid);
-#else
-  return ADDR_BITS_REMOVE ((CORE_ADDR) read_register_pid (PC_REGNUM, pid));
-#endif
-}
-
-CORE_ADDR
-read_pc ()
-{
-  return read_pc_pid (inferior_pid);
-}
-
-void
-write_pc_pid (pc, pid)
-     CORE_ADDR pc;
-     int pid;
-{
-#ifdef TARGET_WRITE_PC
-  TARGET_WRITE_PC (pc, pid);
-#else
-  write_register_pid (PC_REGNUM, pc, pid);
-#ifdef NPC_REGNUM
-  write_register_pid (NPC_REGNUM, pc + 4, pid);
-#ifdef NNPC_REGNUM
-  write_register_pid (NNPC_REGNUM, pc + 8, pid);
-#endif
-#endif
-#endif
-}
-
-void
-write_pc (pc)
-     CORE_ADDR pc;
-{
-  write_pc_pid (pc, inferior_pid);
-}
-
-/* Cope with strage ways of getting to the stack and frame pointers */
-
-CORE_ADDR
-read_sp ()
-{
-#ifdef TARGET_READ_SP
-  return TARGET_READ_SP ();
-#else
-  return read_register (SP_REGNUM);
-#endif
-}
-
-void
-write_sp (val)
-     CORE_ADDR val;
-{
-#ifdef TARGET_WRITE_SP
-  TARGET_WRITE_SP (val);
-#else
-  write_register (SP_REGNUM, val);
-#endif
-}
-
-CORE_ADDR
-read_fp ()
-{
-#ifdef TARGET_READ_FP
-  return TARGET_READ_FP ();
-#else
-  return read_register (FP_REGNUM);
-#endif
-}
-
-void
-write_fp (val)
-     CORE_ADDR val;
-{
-#ifdef TARGET_WRITE_FP
-  TARGET_WRITE_FP (val);
-#else
-  write_register (FP_REGNUM, val);
-#endif
-}
-
-/* Will calling read_var_value or locate_var_value on SYM end
-   up caring what frame it is being evaluated relative to?  SYM must
-   be non-NULL.  */
-int
-symbol_read_needs_frame (sym)
-     struct symbol *sym;
-{
-  switch (SYMBOL_CLASS (sym))
-    {
-      /* All cases listed explicitly so that gcc -Wall will detect it if
-	 we failed to consider one.  */
-    case LOC_REGISTER:
-    case LOC_ARG:
-    case LOC_REF_ARG:
-    case LOC_REGPARM:
-    case LOC_REGPARM_ADDR:
-    case LOC_LOCAL:
-    case LOC_LOCAL_ARG:
-    case LOC_BASEREG:
-    case LOC_BASEREG_ARG:
-      return 1;
-
-    case LOC_UNDEF:
-    case LOC_CONST:
-    case LOC_STATIC:
-    case LOC_TYPEDEF:
-
-    case LOC_LABEL:
-      /* Getting the address of a label can be done independently of the block,
-	 even if some *uses* of that address wouldn't work so well without
-	 the right frame.  */
-
-    case LOC_BLOCK:
-    case LOC_CONST_BYTES:
-    case LOC_UNRESOLVED:
-    case LOC_OPTIMIZED_OUT:
-      return 0;
-    }
-  return 1;
-}
-
-/* Given a struct symbol for a variable,
-   and a stack frame id, read the value of the variable
-   and return a (pointer to a) struct value containing the value. 
-   If the variable cannot be found, return a zero pointer.
-   If FRAME is NULL, use the selected_frame.  */
-
-value_ptr
-read_var_value (var, frame)
-     register struct symbol *var;
-     struct frame_info *frame;
-{
-  register value_ptr v;
-  struct type *type = SYMBOL_TYPE (var);
-  CORE_ADDR addr;
-  register int len;
-
-  v = allocate_value (type);
-  VALUE_LVAL (v) = lval_memory;	/* The most likely possibility.  */
-  VALUE_BFD_SECTION (v) = SYMBOL_BFD_SECTION (var);
-
-  len = TYPE_LENGTH (type);
-
-  if (frame == NULL) frame = selected_frame;
-
-  switch (SYMBOL_CLASS (var))
-    {
-    case LOC_CONST:
-      /* Put the constant back in target format.  */
-      store_signed_integer (VALUE_CONTENTS_RAW (v), len,
-			    (LONGEST) SYMBOL_VALUE (var));
-      VALUE_LVAL (v) = not_lval;
-      return v;
-
-    case LOC_LABEL:
-      /* Put the constant back in target format.  */
-      if (overlay_debugging)
-	store_address (VALUE_CONTENTS_RAW (v), len, 
-		       symbol_overlayed_address (SYMBOL_VALUE_ADDRESS (var),
-						 SYMBOL_BFD_SECTION (var)));
-      else
-	store_address (VALUE_CONTENTS_RAW (v), len, 
-		       SYMBOL_VALUE_ADDRESS (var));
-      VALUE_LVAL (v) = not_lval;
-      return v;
-
-    case LOC_CONST_BYTES:
-      {
-	char *bytes_addr;
-	bytes_addr = SYMBOL_VALUE_BYTES (var);
-	memcpy (VALUE_CONTENTS_RAW (v), bytes_addr, len);
-	VALUE_LVAL (v) = not_lval;
-	return v;
-      }
-
-    case LOC_STATIC:
-      if (overlay_debugging)
-	addr = symbol_overlayed_address (SYMBOL_VALUE_ADDRESS (var),
-					 SYMBOL_BFD_SECTION (var));
-      else
-	addr = SYMBOL_VALUE_ADDRESS (var);
-      break;
-
-    case LOC_ARG:
-      if (frame == NULL)
-	return 0;
-      addr = FRAME_ARGS_ADDRESS (frame);
-      if (!addr)
-	return 0;
-      addr += SYMBOL_VALUE (var);
-      break;
-
-    case LOC_REF_ARG:
-      if (frame == NULL)
-	return 0;
-      addr = FRAME_ARGS_ADDRESS (frame);
-      if (!addr)
-	return 0;
-      addr += SYMBOL_VALUE (var);
-      addr = read_memory_unsigned_integer
-	(addr, TARGET_PTR_BIT / TARGET_CHAR_BIT);
-      break;
-
-    case LOC_LOCAL:
-    case LOC_LOCAL_ARG:
-      if (frame == NULL)
-	return 0;
-      addr = FRAME_LOCALS_ADDRESS (frame);
-      addr += SYMBOL_VALUE (var);
-      break;
-
-    case LOC_BASEREG:
-    case LOC_BASEREG_ARG:
-      {
-	char buf[MAX_REGISTER_RAW_SIZE];
-	get_saved_register (buf, NULL, NULL, frame, SYMBOL_BASEREG (var),
-			    NULL);
-	addr = extract_address (buf, REGISTER_RAW_SIZE (SYMBOL_BASEREG (var)));
-	addr += SYMBOL_VALUE (var);
-	break;
-      }
-			    
-    case LOC_TYPEDEF:
-      error ("Cannot look up value of a typedef");
-      break;
-
-    case LOC_BLOCK:
-      if (overlay_debugging)
-	VALUE_ADDRESS (v) = symbol_overlayed_address 
-	  (BLOCK_START (SYMBOL_BLOCK_VALUE (var)), SYMBOL_BFD_SECTION (var));
-      else
-	VALUE_ADDRESS (v) = BLOCK_START (SYMBOL_BLOCK_VALUE (var));
-      return v;
-
-    case LOC_REGISTER:
-    case LOC_REGPARM:
-    case LOC_REGPARM_ADDR:
-      {
-	struct block *b;
-	int regno = SYMBOL_VALUE (var);
-	value_ptr regval;
-
-	if (frame == NULL)
-	  return 0;
-	b = get_frame_block (frame);
-
-	if (SYMBOL_CLASS (var) == LOC_REGPARM_ADDR)
-	  {
-	    regval = value_from_register (lookup_pointer_type (type),
-					  regno, 
-					  frame);
-
-	    if (regval == NULL)
-	      error ("Value of register variable not available.");
-
-	    addr   = value_as_pointer (regval);
-	    VALUE_LVAL (v) = lval_memory;
-	  }
-	else
-	  {
-	    regval = value_from_register (type, regno, frame);
-
-	    if (regval == NULL)
-	      error ("Value of register variable not available.");
-	    return regval;
-	  }
-      }
-      break;
-
-    case LOC_UNRESOLVED:
-      {
-	struct minimal_symbol *msym;
-
-	msym = lookup_minimal_symbol (SYMBOL_NAME (var), NULL, NULL);
-	if (msym == NULL)
-	  return 0;
-	if (overlay_debugging)
-	  addr = symbol_overlayed_address (SYMBOL_VALUE_ADDRESS (msym),
-					   SYMBOL_BFD_SECTION (msym));
-	else
-	  addr = SYMBOL_VALUE_ADDRESS (msym);
-      }
-      break;
-
-    case LOC_OPTIMIZED_OUT:
-      VALUE_LVAL (v) = not_lval;
-      VALUE_OPTIMIZED_OUT (v) = 1;
-      return v;
-
-    default:
-      error ("Cannot look up value of a botched symbol.");
-      break;
-    }
-
-  VALUE_ADDRESS (v) = addr;
-  VALUE_LAZY (v) = 1;
-  return v;
-}
-
-/* Return a value of type TYPE, stored in register REGNUM, in frame
-   FRAME. 
-
-   NOTE: returns NULL if register value is not available.
-   Caller will check return value or die!  */
-
-value_ptr
-value_from_register (type, regnum, frame)
-     struct type *type;
-     int regnum;
-     struct frame_info *frame;
-{
-  char raw_buffer [MAX_REGISTER_RAW_SIZE];
-  CORE_ADDR addr;
-  int optim;
-  value_ptr v = allocate_value (type);
-  char *value_bytes = 0;
-  int value_bytes_copied = 0;
-  int num_storage_locs;
-  enum lval_type lval;
-  int len;
-
-  CHECK_TYPEDEF (type);
-  len = TYPE_LENGTH (type);
-
-  VALUE_REGNO (v) = regnum;
-
-  num_storage_locs = (len > REGISTER_VIRTUAL_SIZE (regnum) ?
-		      ((len - 1) / REGISTER_RAW_SIZE (regnum)) + 1 :
-		      1);
-
-  if (num_storage_locs > 1
-#ifdef GDB_TARGET_IS_H8500
-      || TYPE_CODE (type) == TYPE_CODE_PTR
-#endif
-      )
-    {
-      /* Value spread across multiple storage locations.  */
-      
-      int local_regnum;
-      int mem_stor = 0, reg_stor = 0;
-      int mem_tracking = 1;
-      CORE_ADDR last_addr = 0;
-      CORE_ADDR first_addr = 0;
-
-      value_bytes = (char *) alloca (len + MAX_REGISTER_RAW_SIZE);
-
-      /* Copy all of the data out, whereever it may be.  */
-
-#ifdef GDB_TARGET_IS_H8500
-/* This piece of hideosity is required because the H8500 treats registers
-   differently depending upon whether they are used as pointers or not.  As a
-   pointer, a register needs to have a page register tacked onto the front.
-   An alternate way to do this would be to have gcc output different register
-   numbers for the pointer & non-pointer form of the register.  But, it
-   doesn't, so we're stuck with this.  */
-
-      if (TYPE_CODE (type) == TYPE_CODE_PTR
-	  && len > 2)
-	{
-	  int page_regnum;
-
-	  switch (regnum)
-	    {
-	    case R0_REGNUM: case R1_REGNUM: case R2_REGNUM: case R3_REGNUM:
-	      page_regnum = SEG_D_REGNUM;
-	      break;
-	    case R4_REGNUM: case R5_REGNUM:
-	      page_regnum = SEG_E_REGNUM;
-	      break;
-	    case R6_REGNUM: case R7_REGNUM:
-	      page_regnum = SEG_T_REGNUM;
-	      break;
-	    }
-
-	  value_bytes[0] = 0;
-	  get_saved_register (value_bytes + 1,
-			      &optim,
-			      &addr,
-			      frame,
-			      page_regnum,
-			      &lval);
-
-	  if (register_valid[page_regnum] == -1)
-	    return NULL;	/* register value not available */
-
-	  if (lval == lval_register)
-	    reg_stor++;
-	  else
-	    mem_stor++;
-	  first_addr = addr;
-	  last_addr = addr;
-
-	  get_saved_register (value_bytes + 2,
-			      &optim,
-			      &addr,
-			      frame,
-			      regnum,
-			      &lval);
-
-	  if (register_valid[regnum] == -1)
-	    return NULL;	/* register value not available */
-
-	  if (lval == lval_register)
-	    reg_stor++;
-	  else
-	    {
-	      mem_stor++;
-	      mem_tracking = mem_tracking && (addr == last_addr);
-	    }
-	  last_addr = addr;
-	}
-      else
-#endif				/* GDB_TARGET_IS_H8500 */
-	for (local_regnum = regnum;
-	     value_bytes_copied < len;
-	     (value_bytes_copied += REGISTER_RAW_SIZE (local_regnum),
-	      ++local_regnum))
-	  {
-	    get_saved_register (value_bytes + value_bytes_copied,
-				&optim,
-				&addr,
-				frame,
-				local_regnum,
-				&lval);
-
-	  if (register_valid[local_regnum] == -1)
-	    return NULL;	/* register value not available */
-
-	    if (regnum == local_regnum)
-	      first_addr = addr;
-	    if (lval == lval_register)
-	      reg_stor++;
-	    else
-	      {
-		mem_stor++;
-	      
-		mem_tracking =
-		  (mem_tracking
-		   && (regnum == local_regnum
-		       || addr == last_addr));
-	      }
-	    last_addr = addr;
-	  }
-
-      if ((reg_stor && mem_stor)
-	  || (mem_stor && !mem_tracking))
-	/* Mixed storage; all of the hassle we just went through was
-	   for some good purpose.  */
-	{
-	  VALUE_LVAL (v) = lval_reg_frame_relative;
-	  VALUE_FRAME (v) = FRAME_FP (frame);
-	  VALUE_FRAME_REGNUM (v) = regnum;
-	}
-      else if (mem_stor)
-	{
-	  VALUE_LVAL (v) = lval_memory;
-	  VALUE_ADDRESS (v) = first_addr;
-	}
-      else if (reg_stor)
-	{
-	  VALUE_LVAL (v) = lval_register;
-	  VALUE_ADDRESS (v) = first_addr;
-	}
-      else
-	fatal ("value_from_register: Value not stored anywhere!");
-
-      VALUE_OPTIMIZED_OUT (v) = optim;
-
-      /* Any structure stored in more than one register will always be
-	 an integral number of registers.  Otherwise, you'd need to do
-	 some fiddling with the last register copied here for little
-	 endian machines.  */
-
-      /* Copy into the contents section of the value.  */
-      memcpy (VALUE_CONTENTS_RAW (v), value_bytes, len);
-
-      /* Finally do any conversion necessary when extracting this
-         type from more than one register.  */
-#ifdef REGISTER_CONVERT_TO_TYPE
-      REGISTER_CONVERT_TO_TYPE(regnum, type, VALUE_CONTENTS_RAW(v));
-#endif
-      return v;
-    }
-
-  /* Data is completely contained within a single register.  Locate the
-     register's contents in a real register or in core;
-     read the data in raw format.  */
-
-  get_saved_register (raw_buffer, &optim, &addr, frame, regnum, &lval);
-
-  if (register_valid[regnum] == -1)
-    return NULL;	/* register value not available */
-
-  VALUE_OPTIMIZED_OUT (v) = optim;
-  VALUE_LVAL (v) = lval;
-  VALUE_ADDRESS (v) = addr;
-
-  /* Convert raw data to virtual format if necessary.  */
-  
-#ifdef REGISTER_CONVERTIBLE
-  if (REGISTER_CONVERTIBLE (regnum))
-    {
-      REGISTER_CONVERT_TO_VIRTUAL (regnum, type,
-				   raw_buffer, VALUE_CONTENTS_RAW (v));
-    }
-  else
-#endif
-    {
-      /* Raw and virtual formats are the same for this register.  */
-
-      if (TARGET_BYTE_ORDER == BIG_ENDIAN && len < REGISTER_RAW_SIZE (regnum))
-	{
-  	  /* Big-endian, and we want less than full size.  */
-	  VALUE_OFFSET (v) = REGISTER_RAW_SIZE (regnum) - len;
-	}
-
-      memcpy (VALUE_CONTENTS_RAW (v), raw_buffer + VALUE_OFFSET (v), len);
-    }
-  
-  return v;
-}
-
-/* Given a struct symbol for a variable or function,
-   and a stack frame id, 
-   return a (pointer to a) struct value containing the properly typed
-   address.  */
-
-value_ptr
-locate_var_value (var, frame)
-     register struct symbol *var;
-     struct frame_info *frame;
-{
-  CORE_ADDR addr = 0;
-  struct type *type = SYMBOL_TYPE (var);
-  value_ptr lazy_value;
-
-  /* Evaluate it first; if the result is a memory address, we're fine.
-     Lazy evaluation pays off here. */
-
-  lazy_value = read_var_value (var, frame);
-  if (lazy_value == 0)
-    error ("Address of \"%s\" is unknown.", SYMBOL_SOURCE_NAME (var));
-
-  if (VALUE_LAZY (lazy_value)
-      || TYPE_CODE (type) == TYPE_CODE_FUNC)
-    {
-      value_ptr val;
-
-      addr = VALUE_ADDRESS (lazy_value);
-      val =  value_from_longest (lookup_pointer_type (type), (LONGEST) addr);
-      VALUE_BFD_SECTION (val) = VALUE_BFD_SECTION (lazy_value);
-      return val;
-    }
-
-  /* Not a memory address; check what the problem was.  */
-  switch (VALUE_LVAL (lazy_value)) 
-    {
-    case lval_register:
-    case lval_reg_frame_relative:
-      error ("Address requested for identifier \"%s\" which is in a register.",
-	     SYMBOL_SOURCE_NAME (var));
-      break;
-
-    default:
-      error ("Can't take address of \"%s\" which isn't an lvalue.",
-	     SYMBOL_SOURCE_NAME (var));
-      break;
-    }
-  return 0;  /* For lint -- never reached */
-}