745b8ca0fc
* bcache.h, bcache.c, c-valprint.c, coffread.c, stabsread.c, stack.c, valprint.c: Change variables to unsigned. * bcache.c: Rearrange to avoid warnings about variables not being set. * c-lang.c, ch-lang.c, f-lang.c, m2-lang.c: Include valprint.h rather than declaring print_max and repeat_count_threashold ourselves (incorrectly). * valprint.h: Do declare repeat_count_threashold. * ch-exp.c: Use default case for internal error. * findvar.c: Don't omit argument type. * symtab.c: Remove unused variable.
1759 lines
44 KiB
C
1759 lines
44 KiB
C
/* Find a variable's value in memory, for GDB, the GNU debugger.
|
||
Copyright 1986, 87, 89, 91, 94, 95, 96, 1998
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Free Software Foundation, Inc.
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This file is part of GDB.
|
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This program is free software; you can redistribute it and/or modify
|
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it under the terms of the GNU General Public License as published by
|
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the Free Software Foundation; either version 2 of the License, or
|
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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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.
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You should have received a copy of the GNU General Public License
|
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along with this program; if not, write to the Free Software
|
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "symtab.h"
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#include "gdbtypes.h"
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#include "frame.h"
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#include "value.h"
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#include "gdbcore.h"
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#include "inferior.h"
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#include "target.h"
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#include "gdb_string.h"
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#include "floatformat.h"
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#include "symfile.h" /* for overlay functions */
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/* This is used to indicate that we don't know the format of the floating point
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number. Typically, this is useful for native ports, where the actual format
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is irrelevant, since no conversions will be taking place. */
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const struct floatformat floatformat_unknown;
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/* Registers we shouldn't try to store. */
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#if !defined (CANNOT_STORE_REGISTER)
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#define CANNOT_STORE_REGISTER(regno) 0
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#endif
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static void write_register_gen PARAMS ((int, char *));
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static int read_relative_register_raw_bytes_for_frame PARAMS ((int regnum, char *myaddr, struct frame_info * frame));
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/* Basic byte-swapping routines. GDB has needed these for a long time...
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All extract a target-format integer at ADDR which is LEN bytes long. */
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#if TARGET_CHAR_BIT != 8 || HOST_CHAR_BIT != 8
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/* 8 bit characters are a pretty safe assumption these days, so we
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assume it throughout all these swapping routines. If we had to deal with
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9 bit characters, we would need to make len be in bits and would have
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to re-write these routines... */
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you lose
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#endif
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LONGEST
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extract_signed_integer (addr, len)
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PTR addr;
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int len;
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{
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LONGEST retval;
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unsigned char *p;
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unsigned char *startaddr = (unsigned char *) addr;
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unsigned char *endaddr = startaddr + len;
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if (len > (int) sizeof (LONGEST))
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error ("\
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That operation is not available on integers of more than %d bytes.",
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sizeof (LONGEST));
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/* Start at the most significant end of the integer, and work towards
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the least significant. */
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if (TARGET_BYTE_ORDER == BIG_ENDIAN)
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{
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p = startaddr;
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/* Do the sign extension once at the start. */
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retval = ((LONGEST) * p ^ 0x80) - 0x80;
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for (++p; p < endaddr; ++p)
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retval = (retval << 8) | *p;
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}
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else
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{
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p = endaddr - 1;
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/* Do the sign extension once at the start. */
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retval = ((LONGEST) * p ^ 0x80) - 0x80;
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for (--p; p >= startaddr; --p)
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retval = (retval << 8) | *p;
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}
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return retval;
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}
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ULONGEST
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extract_unsigned_integer (addr, len)
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PTR addr;
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int len;
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{
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ULONGEST retval;
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unsigned char *p;
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unsigned char *startaddr = (unsigned char *) addr;
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unsigned char *endaddr = startaddr + len;
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if (len > (int) sizeof (ULONGEST))
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error ("\
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That operation is not available on integers of more than %d bytes.",
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sizeof (ULONGEST));
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/* Start at the most significant end of the integer, and work towards
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the least significant. */
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retval = 0;
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if (TARGET_BYTE_ORDER == BIG_ENDIAN)
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{
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for (p = startaddr; p < endaddr; ++p)
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retval = (retval << 8) | *p;
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}
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else
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{
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for (p = endaddr - 1; p >= startaddr; --p)
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retval = (retval << 8) | *p;
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}
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return retval;
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}
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/* Sometimes a long long unsigned integer can be extracted as a
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LONGEST value. This is done so that we can print these values
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better. If this integer can be converted to a LONGEST, this
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function returns 1 and sets *PVAL. Otherwise it returns 0. */
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int
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extract_long_unsigned_integer (addr, orig_len, pval)
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PTR addr;
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int orig_len;
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LONGEST *pval;
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{
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char *p, *first_addr;
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int len;
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len = orig_len;
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if (TARGET_BYTE_ORDER == BIG_ENDIAN)
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{
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for (p = (char *) addr;
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len > (int) sizeof (LONGEST) && p < (char *) addr + orig_len;
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p++)
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{
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if (*p == 0)
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len--;
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else
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break;
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}
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first_addr = p;
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}
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else
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{
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first_addr = (char *) addr;
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for (p = (char *) addr + orig_len - 1;
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len > (int) sizeof (LONGEST) && p >= (char *) addr;
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p--)
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{
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if (*p == 0)
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len--;
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else
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break;
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}
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}
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if (len <= (int) sizeof (LONGEST))
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{
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*pval = (LONGEST) extract_unsigned_integer (first_addr,
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sizeof (LONGEST));
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return 1;
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}
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return 0;
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}
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CORE_ADDR
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extract_address (addr, len)
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PTR addr;
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int len;
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{
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/* Assume a CORE_ADDR can fit in a LONGEST (for now). Not sure
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whether we want this to be true eventually. */
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return (CORE_ADDR) extract_unsigned_integer (addr, len);
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}
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void
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store_signed_integer (addr, len, val)
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PTR addr;
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int len;
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LONGEST val;
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{
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unsigned char *p;
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unsigned char *startaddr = (unsigned char *) addr;
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unsigned char *endaddr = startaddr + len;
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/* Start at the least significant end of the integer, and work towards
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the most significant. */
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if (TARGET_BYTE_ORDER == BIG_ENDIAN)
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{
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for (p = endaddr - 1; p >= startaddr; --p)
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{
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*p = val & 0xff;
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val >>= 8;
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}
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}
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else
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{
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for (p = startaddr; p < endaddr; ++p)
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{
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*p = val & 0xff;
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val >>= 8;
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}
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}
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}
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void
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store_unsigned_integer (addr, len, val)
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PTR addr;
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int len;
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ULONGEST val;
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{
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unsigned char *p;
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unsigned char *startaddr = (unsigned char *) addr;
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unsigned char *endaddr = startaddr + len;
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/* Start at the least significant end of the integer, and work towards
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the most significant. */
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if (TARGET_BYTE_ORDER == BIG_ENDIAN)
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{
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for (p = endaddr - 1; p >= startaddr; --p)
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{
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*p = val & 0xff;
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val >>= 8;
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}
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}
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else
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{
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for (p = startaddr; p < endaddr; ++p)
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{
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*p = val & 0xff;
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val >>= 8;
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}
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}
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}
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/* Store the literal address "val" into
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gdb-local memory pointed to by "addr"
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for "len" bytes. */
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void
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store_address (addr, len, val)
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PTR addr;
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int len;
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LONGEST val;
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{
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store_unsigned_integer (addr, len, val);
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}
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/* Extract a floating-point number from a target-order byte-stream at ADDR.
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Returns the value as type DOUBLEST.
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If the host and target formats agree, we just copy the raw data into the
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appropriate type of variable and return, letting the host increase precision
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as necessary. Otherwise, we call the conversion routine and let it do the
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dirty work. */
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DOUBLEST
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extract_floating (addr, len)
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PTR addr;
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int len;
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{
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DOUBLEST dretval;
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if (len == sizeof (float))
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{
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if (HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT)
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{
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float retval;
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memcpy (&retval, addr, sizeof (retval));
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return retval;
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}
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else
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floatformat_to_doublest (TARGET_FLOAT_FORMAT, addr, &dretval);
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}
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else if (len == sizeof (double))
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{
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if (HOST_DOUBLE_FORMAT == TARGET_DOUBLE_FORMAT)
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{
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double retval;
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memcpy (&retval, addr, sizeof (retval));
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return retval;
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}
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else
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floatformat_to_doublest (TARGET_DOUBLE_FORMAT, addr, &dretval);
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}
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else if (len == sizeof (DOUBLEST))
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{
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if (HOST_LONG_DOUBLE_FORMAT == TARGET_LONG_DOUBLE_FORMAT)
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{
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DOUBLEST retval;
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memcpy (&retval, addr, sizeof (retval));
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return retval;
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}
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else
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floatformat_to_doublest (TARGET_LONG_DOUBLE_FORMAT, addr, &dretval);
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}
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#ifdef TARGET_EXTRACT_FLOATING
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else if (TARGET_EXTRACT_FLOATING (addr, len, &dretval))
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return dretval;
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#endif
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else
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{
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error ("Can't deal with a floating point number of %d bytes.", len);
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}
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return dretval;
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}
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void
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store_floating (addr, len, val)
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PTR addr;
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int len;
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DOUBLEST val;
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{
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if (len == sizeof (float))
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{
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if (HOST_FLOAT_FORMAT == TARGET_FLOAT_FORMAT)
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{
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float floatval = val;
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memcpy (addr, &floatval, sizeof (floatval));
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}
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else
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floatformat_from_doublest (TARGET_FLOAT_FORMAT, &val, addr);
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}
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else if (len == sizeof (double))
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{
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if (HOST_DOUBLE_FORMAT == TARGET_DOUBLE_FORMAT)
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{
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double doubleval = val;
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memcpy (addr, &doubleval, sizeof (doubleval));
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}
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else
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floatformat_from_doublest (TARGET_DOUBLE_FORMAT, &val, addr);
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}
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else if (len == sizeof (DOUBLEST))
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{
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if (HOST_LONG_DOUBLE_FORMAT == TARGET_LONG_DOUBLE_FORMAT)
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memcpy (addr, &val, sizeof (val));
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else
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floatformat_from_doublest (TARGET_LONG_DOUBLE_FORMAT, &val, addr);
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}
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#ifdef TARGET_STORE_FLOATING
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else if (TARGET_STORE_FLOATING (addr, len, val))
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return;
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#endif
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else
|
||
{
|
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error ("Can't deal with a floating point number of %d bytes.", len);
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}
|
||
}
|
||
|
||
|
||
/* Return the address in which frame FRAME's value of register REGNUM
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has been saved in memory. Or return zero if it has not been saved.
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If REGNUM specifies the SP, the value we return is actually
|
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the SP value, not an address where it was saved. */
|
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|
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CORE_ADDR
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find_saved_register (frame, regnum)
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struct frame_info *frame;
|
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int regnum;
|
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{
|
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register struct frame_info *frame1 = NULL;
|
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register CORE_ADDR addr = 0;
|
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|
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if (frame == NULL) /* No regs saved if want current frame */
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return 0;
|
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|
||
#ifdef HAVE_REGISTER_WINDOWS
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/* We assume that a register in a register window will only be saved
|
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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
|
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saved in a lower (more interior) frame. This change is a result
|
||
of working on a register window machine; get_frame_saved_regs
|
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always returns the registers saved within a frame, within the
|
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context (register namespace) of that frame. */
|
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|
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/* However, note that we don't want this to return anything if
|
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nothing is saved (if there's a frame inside of this one). Also,
|
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callers to this routine asking for the stack pointer want the
|
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stack pointer saved for *this* frame; this is returned from the
|
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next frame. */
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||
|
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if (REGISTER_IN_WINDOW_P (regnum))
|
||
{
|
||
frame1 = get_next_frame (frame);
|
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if (!frame1)
|
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return 0; /* Registers of this frame are active. */
|
||
|
||
/* Get the SP from the next frame in; it will be this
|
||
current frame. */
|
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if (regnum != SP_REGNUM)
|
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frame1 = frame;
|
||
|
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FRAME_INIT_SAVED_REGS (frame1);
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return frame1->saved_regs[regnum]; /* ... which might be zero */
|
||
}
|
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#endif /* HAVE_REGISTER_WINDOWS */
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|
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/* Note that this next routine assumes that registers used in
|
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frame x will be saved only in the frame that x calls and
|
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frames interior to it. This is not true on the sparc, but the
|
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above macro takes care of it, so we should be all right. */
|
||
while (1)
|
||
{
|
||
QUIT;
|
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frame1 = get_prev_frame (frame1);
|
||
if (frame1 == 0 || frame1 == frame)
|
||
break;
|
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FRAME_INIT_SAVED_REGS (frame1);
|
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if (frame1->saved_regs[regnum])
|
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addr = frame1->saved_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
|
||
default_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), (LONGEST) 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;
|
||
}
|
||
|
||
#if !defined (GET_SAVED_REGISTER)
|
||
#define GET_SAVED_REGISTER(raw_buffer, optimized, addrp, frame, regnum, lval) \
|
||
default_get_saved_register(raw_buffer, optimized, addrp, frame, regnum, lval)
|
||
#endif
|
||
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;
|
||
{
|
||
GET_SAVED_REGISTER (raw_buffer, optimized, addrp, frame, regnum, lval);
|
||
}
|
||
|
||
/* Copy the bytes of register REGNUM, relative to the input 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. */
|
||
|
||
static int
|
||
read_relative_register_raw_bytes_for_frame (regnum, myaddr, frame)
|
||
int regnum;
|
||
char *myaddr;
|
||
struct frame_info *frame;
|
||
{
|
||
int optim;
|
||
if (regnum == FP_REGNUM && frame)
|
||
{
|
||
/* Put it back in target format. */
|
||
store_address (myaddr, REGISTER_RAW_SIZE (FP_REGNUM),
|
||
(LONGEST) FRAME_FP (frame));
|
||
|
||
return 0;
|
||
}
|
||
|
||
get_saved_register (myaddr, &optim, (CORE_ADDR *) NULL, frame,
|
||
regnum, (enum lval_type *) NULL);
|
||
|
||
if (register_valid[regnum] < 0)
|
||
return 1; /* register value not available */
|
||
|
||
return optim;
|
||
}
|
||
|
||
/* 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;
|
||
{
|
||
return read_relative_register_raw_bytes_for_frame (regnum, myaddr,
|
||
selected_frame);
|
||
}
|
||
|
||
/* 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. */
|
||
|
||
if (REGISTER_CONVERTIBLE (regnum))
|
||
{
|
||
REGISTER_CONVERT_TO_VIRTUAL (regnum, REGISTER_VIRTUAL_TYPE (regnum),
|
||
raw_buffer, VALUE_CONTENTS_RAW (reg_val));
|
||
}
|
||
else if (REGISTER_RAW_SIZE (regnum) == REGISTER_VIRTUAL_SIZE (regnum))
|
||
memcpy (VALUE_CONTENTS_RAW (reg_val), raw_buffer,
|
||
REGISTER_RAW_SIZE (regnum));
|
||
else
|
||
internal_error ("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 and state of the registers (in target byte order). */
|
||
|
||
char *registers;
|
||
|
||
/* VALID_REGISTER is non-zero if it has been fetched, -1 if the
|
||
register value was not available. */
|
||
|
||
signed char *register_valid;
|
||
|
||
/* 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 and write_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.
|
||
|
||
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;
|
||
|
||
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);
|
||
|
||
if (regend <= inregbyte || inregend <= regstart)
|
||
/* The range the user wants to read doesn't overlap with regno. */
|
||
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, ®isters[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, ®isters[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 (®isters[REGISTER_BYTE (regno)], myaddr, size) == 0)
|
||
return;
|
||
|
||
target_prepare_to_store ();
|
||
|
||
memcpy (®isters[REGISTER_BYTE (regno)], myaddr, size);
|
||
|
||
register_valid[regno] = 1;
|
||
|
||
target_store_registers (regno);
|
||
}
|
||
|
||
/* 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;
|
||
|
||
regstart = REGISTER_BYTE (regno);
|
||
regend = regstart + REGISTER_RAW_SIZE (regno);
|
||
|
||
/* Is this register completely outside the range the user is writing? */
|
||
if (myregend <= regstart || regend <= myregstart)
|
||
/* do nothing */ ;
|
||
|
||
/* Is this register completely within the range the user is writing? */
|
||
else if (myregstart <= regstart && regend <= myregend)
|
||
write_register_gen (regno, myaddr + (regstart - myregstart));
|
||
|
||
/* The register partially overlaps the range being written. */
|
||
else
|
||
{
|
||
char regbuf[MAX_REGISTER_RAW_SIZE];
|
||
/* What's the overlap between this register's bytes and
|
||
those the caller wants to write? */
|
||
int overlapstart = max (regstart, myregstart);
|
||
int overlapend = min (regend, myregend);
|
||
|
||
/* 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);
|
||
|
||
memcpy (registers + overlapstart,
|
||
myaddr + (overlapstart - myregstart),
|
||
overlapend - overlapstart);
|
||
|
||
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 (CORE_ADDR) extract_address (®isters[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.
|
||
This should probably write a LONGEST rather than a CORE_ADDR */
|
||
|
||
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 (®isters[REGISTER_BYTE (regno)], buf, size) == 0)
|
||
return;
|
||
|
||
target_prepare_to_store ();
|
||
|
||
memcpy (®isters[REGISTER_BYTE (regno)], buf, size);
|
||
|
||
register_valid[regno] = 1;
|
||
|
||
target_store_registers (regno);
|
||
}
|
||
|
||
void
|
||
write_register_pid (regno, val, pid)
|
||
int regno;
|
||
CORE_ADDR 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 (®isters[REGISTER_BYTE (regno)], val, REGISTER_RAW_SIZE (regno));
|
||
else
|
||
memset (®isters[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, ®isters[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.
|
||
|
||
1999-06-08: The following were re-written so that it assumes the
|
||
existance of a TARGET_READ_PC et.al. macro. A default generic
|
||
version of that macro is made available where needed.
|
||
|
||
Since the ``TARGET_READ_PC'' et.al. macro is going to be controlled
|
||
by the multi-arch framework, it will eventually be possible to
|
||
eliminate the intermediate read_pc_pid(). The client would call
|
||
TARGET_READ_PC directly. (cagney). */
|
||
|
||
#ifndef TARGET_READ_PC
|
||
#define TARGET_READ_PC generic_target_read_pc
|
||
#endif
|
||
|
||
CORE_ADDR
|
||
generic_target_read_pc (int pid)
|
||
{
|
||
#ifdef PC_REGNUM
|
||
if (PC_REGNUM >= 0)
|
||
{
|
||
CORE_ADDR pc_val = ADDR_BITS_REMOVE ((CORE_ADDR) read_register_pid (PC_REGNUM, pid));
|
||
return pc_val;
|
||
}
|
||
#endif
|
||
internal_error ("generic_target_read_pc");
|
||
return 0;
|
||
}
|
||
|
||
CORE_ADDR
|
||
read_pc_pid (pid)
|
||
int pid;
|
||
{
|
||
int saved_inferior_pid;
|
||
CORE_ADDR pc_val;
|
||
|
||
/* In case pid != inferior_pid. */
|
||
saved_inferior_pid = inferior_pid;
|
||
inferior_pid = pid;
|
||
|
||
pc_val = TARGET_READ_PC (pid);
|
||
|
||
inferior_pid = saved_inferior_pid;
|
||
return pc_val;
|
||
}
|
||
|
||
CORE_ADDR
|
||
read_pc ()
|
||
{
|
||
return read_pc_pid (inferior_pid);
|
||
}
|
||
|
||
#ifndef TARGET_WRITE_PC
|
||
#define TARGET_WRITE_PC generic_target_write_pc
|
||
#endif
|
||
|
||
void
|
||
generic_target_write_pc (pc, pid)
|
||
CORE_ADDR pc;
|
||
int pid;
|
||
{
|
||
#ifdef PC_REGNUM
|
||
if (PC_REGNUM >= 0)
|
||
write_register_pid (PC_REGNUM, pc, pid);
|
||
#ifdef NPC_REGNUM
|
||
if (NPC_REGNUM >= 0)
|
||
write_register_pid (NPC_REGNUM, pc + 4, pid);
|
||
#ifdef NNPC_REGNUM
|
||
if (NNPC_REGNUM >= 0)
|
||
write_register_pid (NNPC_REGNUM, pc + 8, pid);
|
||
#endif
|
||
#endif
|
||
#else
|
||
internal_error ("generic_target_write_pc");
|
||
#endif
|
||
}
|
||
|
||
void
|
||
write_pc_pid (pc, pid)
|
||
CORE_ADDR pc;
|
||
int pid;
|
||
{
|
||
int saved_inferior_pid;
|
||
|
||
/* In case pid != inferior_pid. */
|
||
saved_inferior_pid = inferior_pid;
|
||
inferior_pid = pid;
|
||
|
||
TARGET_WRITE_PC (pc, pid);
|
||
|
||
inferior_pid = saved_inferior_pid;
|
||
}
|
||
|
||
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 */
|
||
|
||
#ifndef TARGET_READ_SP
|
||
#define TARGET_READ_SP generic_target_read_sp
|
||
#endif
|
||
|
||
CORE_ADDR
|
||
generic_target_read_sp ()
|
||
{
|
||
#ifdef SP_REGNUM
|
||
if (SP_REGNUM >= 0)
|
||
return read_register (SP_REGNUM);
|
||
#endif
|
||
internal_error ("generic_target_read_sp");
|
||
}
|
||
|
||
CORE_ADDR
|
||
read_sp ()
|
||
{
|
||
return TARGET_READ_SP ();
|
||
}
|
||
|
||
#ifndef TARGET_WRITE_SP
|
||
#define TARGET_WRITE_SP generic_target_write_sp
|
||
#endif
|
||
|
||
void
|
||
generic_target_write_sp (val)
|
||
CORE_ADDR val;
|
||
{
|
||
#ifdef SP_REGNUM
|
||
if (SP_REGNUM >= 0)
|
||
{
|
||
write_register (SP_REGNUM, val);
|
||
return;
|
||
}
|
||
#endif
|
||
internal_error ("generic_target_write_sp");
|
||
}
|
||
|
||
void
|
||
write_sp (val)
|
||
CORE_ADDR val;
|
||
{
|
||
TARGET_WRITE_SP (val);
|
||
}
|
||
|
||
#ifndef TARGET_READ_FP
|
||
#define TARGET_READ_FP generic_target_read_fp
|
||
#endif
|
||
|
||
CORE_ADDR
|
||
generic_target_read_fp ()
|
||
{
|
||
#ifdef FP_REGNUM
|
||
if (FP_REGNUM >= 0)
|
||
return read_register (FP_REGNUM);
|
||
#endif
|
||
internal_error ("generic_target_read_fp");
|
||
}
|
||
|
||
CORE_ADDR
|
||
read_fp ()
|
||
{
|
||
return TARGET_READ_FP ();
|
||
}
|
||
|
||
#ifndef TARGET_WRITE_FP
|
||
#define TARGET_WRITE_FP generic_target_write_fp
|
||
#endif
|
||
|
||
void
|
||
generic_target_write_fp (val)
|
||
CORE_ADDR val;
|
||
{
|
||
#ifdef FP_REGNUM
|
||
if (FP_REGNUM >= 0)
|
||
{
|
||
write_register (FP_REGNUM, val);
|
||
return;
|
||
}
|
||
#endif
|
||
internal_error ("generic_target_write_fp");
|
||
}
|
||
|
||
void
|
||
write_fp (val)
|
||
CORE_ADDR val;
|
||
{
|
||
TARGET_WRITE_FP (val);
|
||
}
|
||
|
||
/* 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:
|
||
case LOC_THREAD_LOCAL_STATIC:
|
||
return 1;
|
||
|
||
case LOC_UNDEF:
|
||
case LOC_CONST:
|
||
case LOC_STATIC:
|
||
case LOC_INDIRECT:
|
||
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,
|
||
(LONGEST) symbol_overlayed_address (SYMBOL_VALUE_ADDRESS (var),
|
||
SYMBOL_BFD_SECTION (var)));
|
||
else
|
||
store_address (VALUE_CONTENTS_RAW (v), len,
|
||
(LONGEST) 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_INDIRECT:
|
||
/* The import slot does not have a real address in it from the
|
||
dynamic loader (dld.sl on HP-UX), if the target hasn't begun
|
||
execution yet, so check for that. */
|
||
if (!target_has_execution)
|
||
error ("\
|
||
Attempt to access variable defined in different shared object or load module when\n\
|
||
addresses have not been bound by the dynamic loader. Try again when executable is running.");
|
||
|
||
addr = SYMBOL_VALUE_ADDRESS (var);
|
||
addr = read_memory_unsigned_integer
|
||
(addr, TARGET_PTR_BIT / TARGET_CHAR_BIT);
|
||
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_THREAD_LOCAL_STATIC:
|
||
{
|
||
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);
|
||
|
||
/* Pointers on D10V are really only 16 bits, but we lie to gdb elsewhere... */
|
||
if (GDB_TARGET_IS_D10V && TYPE_CODE (type) == TYPE_CODE_PTR)
|
||
len = 2;
|
||
|
||
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
|
||
internal_error ("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. */
|
||
|
||
if (REGISTER_CONVERTIBLE (regnum))
|
||
{
|
||
REGISTER_CONVERT_TO_VIRTUAL (regnum, type,
|
||
raw_buffer, VALUE_CONTENTS_RAW (v));
|
||
}
|
||
else
|
||
{
|
||
/* 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);
|
||
}
|
||
|
||
if (GDB_TARGET_IS_D10V
|
||
&& TYPE_CODE (type) == TYPE_CODE_PTR
|
||
&& TYPE_TARGET_TYPE (type)
|
||
&& (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_FUNC))
|
||
{
|
||
/* pointer to function */
|
||
unsigned long num;
|
||
unsigned short snum;
|
||
snum = (unsigned short) extract_unsigned_integer (VALUE_CONTENTS_RAW (v), 2);
|
||
num = D10V_MAKE_IADDR (snum);
|
||
store_address (VALUE_CONTENTS_RAW (v), 4, num);
|
||
}
|
||
else if (GDB_TARGET_IS_D10V
|
||
&& TYPE_CODE (type) == TYPE_CODE_PTR)
|
||
{
|
||
/* pointer to data */
|
||
unsigned long num;
|
||
unsigned short snum;
|
||
snum = (unsigned short) extract_unsigned_integer (VALUE_CONTENTS_RAW (v), 2);
|
||
num = D10V_MAKE_DADDR (snum);
|
||
store_address (VALUE_CONTENTS_RAW (v), 4, num);
|
||
}
|
||
|
||
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 */
|
||
}
|
||
|
||
|
||
static void build_findvar PARAMS ((void));
|
||
static void
|
||
build_findvar ()
|
||
{
|
||
/* We allocate some extra slop since we do a lot of memcpy's around
|
||
`registers', and failing-soft is better than failing hard. */
|
||
int sizeof_registers = REGISTER_BYTES + /* SLOP */ 256;
|
||
int sizeof_register_valid = NUM_REGS * sizeof (*register_valid);
|
||
registers = xmalloc (sizeof_registers);
|
||
memset (registers, 0, sizeof_registers);
|
||
register_valid = xmalloc (sizeof_register_valid);
|
||
memset (register_valid, 0, sizeof_register_valid);
|
||
}
|
||
|
||
void _initialize_findvar PARAMS ((void));
|
||
void
|
||
_initialize_findvar ()
|
||
{
|
||
build_findvar ();
|
||
|
||
register_gdbarch_swap (®isters, sizeof (registers), NULL);
|
||
register_gdbarch_swap (®ister_valid, sizeof (register_valid), NULL);
|
||
register_gdbarch_swap (NULL, 0, build_findvar);
|
||
}
|