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4879254531
i386m3-nat.c, config/m68k/tm-m68k.h, i960-tdep.c config/i960/tm-i960.h, remote-nindy.c, config/m88k/tm-m88k.h, m88k-tdep.c: Use floatformat.h instead of ieee-float.h. * sparc-tdep.c: Remove now-obsolete ieee-float.h stuff * findvar.c: Update comment regarding ieee-float.h.
1046 lines
28 KiB
C
1046 lines
28 KiB
C
/* Find a variable's value in memory, for GDB, the GNU debugger.
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Copyright 1986, 1987, 1989, 1991 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
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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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., 675 Mass Ave, Cambridge, MA 02139, 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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/* 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 > 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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p = startaddr;
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#else
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p = endaddr - 1;
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#endif
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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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#if TARGET_BYTE_ORDER == BIG_ENDIAN
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for (++p; p < endaddr; ++p)
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#else
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for (--p; p >= startaddr; --p)
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#endif
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{
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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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unsigned LONGEST
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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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unsigned 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 > sizeof (unsigned 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 (unsigned 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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retval = 0;
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#if TARGET_BYTE_ORDER == BIG_ENDIAN
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for (p = startaddr; p < endaddr; ++p)
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#else
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for (p = endaddr - 1; p >= startaddr; --p)
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#endif
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{
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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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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 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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for (p = endaddr - 1; p >= startaddr; --p)
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#else
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for (p = startaddr; p < endaddr; ++p)
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#endif
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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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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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unsigned 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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for (p = endaddr - 1; p >= startaddr; --p)
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#else
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for (p = startaddr; p < endaddr; ++p)
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#endif
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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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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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CORE_ADDR val;
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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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store_unsigned_integer (addr, len, (LONGEST)val);
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}
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/* Swap LEN bytes at BUFFER between target and host byte-order. This is
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the wrong way to do byte-swapping because it assumes that you have a way
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to have a host variable of exactly the right size. Once extract_floating
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and store_floating have been fixed, this can go away. */
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#if TARGET_BYTE_ORDER == HOST_BYTE_ORDER
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#define SWAP_TARGET_AND_HOST(buffer,len)
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#else /* Target and host byte order differ. */
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#define SWAP_TARGET_AND_HOST(buffer,len) \
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{ \
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char tmp; \
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char *p = (char *)(buffer); \
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char *q = ((char *)(buffer)) + len - 1; \
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for (; p < q; p++, q--) \
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{ \
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tmp = *q; \
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*q = *p; \
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*p = tmp; \
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} \
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}
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#endif /* Target and host byte order differ. */
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/* There are many problems with floating point cross-debugging.
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1. These routines only handle byte-swapping, not conversion of
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formats. So if host is IEEE floating and target is VAX floating,
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or vice-versa, it loses. This means that we can't (yet) use these
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routines for extendeds. Extendeds are handled by
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REGISTER_CONVERTIBLE. What we want is to use floatformat.h, but that
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doesn't yet handle VAX floating at all.
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2. We can't deal with it if there is more than one floating point
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format in use. This has to be fixed at the unpack_double level.
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3. We probably should have a LONGEST_DOUBLE or DOUBLEST or whatever
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we want to call it which is long double where available. */
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double
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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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if (len == sizeof (float))
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{
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float retval;
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memcpy (&retval, addr, sizeof (retval));
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SWAP_TARGET_AND_HOST (&retval, sizeof (retval));
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return retval;
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}
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else if (len == sizeof (double))
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{
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double retval;
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memcpy (&retval, addr, sizeof (retval));
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SWAP_TARGET_AND_HOST (&retval, sizeof (retval));
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return retval;
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}
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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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}
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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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double val;
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{
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if (len == sizeof (float))
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{
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float floatval = val;
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SWAP_TARGET_AND_HOST (&floatval, sizeof (floatval));
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memcpy (addr, &floatval, sizeof (floatval));
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}
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else if (len == sizeof (double))
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{
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SWAP_TARGET_AND_HOST (&val, sizeof (val));
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memcpy (addr, &val, sizeof (val));
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}
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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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}
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#if !defined (GET_SAVED_REGISTER)
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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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CORE_ADDR
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find_saved_register (frame, regnum)
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FRAME frame;
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int regnum;
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{
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struct frame_info *fi;
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struct frame_saved_regs saved_regs;
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register FRAME frame1 = 0;
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register CORE_ADDR addr = 0;
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if (frame == 0) /* 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
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towards inner frames), so we only call get_frame_saved_regs on
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the current frame. This is directly in contradiction to the
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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
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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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/* 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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if (REGISTER_IN_WINDOW_P(regnum))
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{
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frame1 = get_next_frame (frame);
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if (!frame1) return 0; /* Registers of this frame are
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active. */
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/* Get the SP from the next frame in; it will be this
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current frame. */
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if (regnum != SP_REGNUM)
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frame1 = frame;
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fi = get_frame_info (frame1);
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get_frame_saved_regs (fi, &saved_regs);
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return saved_regs.regs[regnum]; /* ... which might be zero */
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}
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#endif /* HAVE_REGISTER_WINDOWS */
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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. */
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while (1)
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{
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QUIT;
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frame1 = get_prev_frame (frame1);
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if (frame1 == 0 || frame1 == frame)
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break;
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fi = get_frame_info (frame1);
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get_frame_saved_regs (fi, &saved_regs);
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if (saved_regs.regs[regnum])
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addr = saved_regs.regs[regnum];
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}
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return addr;
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}
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/* Find register number REGNUM relative to FRAME and put its (raw,
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target format) contents in *RAW_BUFFER. Set *OPTIMIZED if the
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variable was optimized out (and thus can't be fetched). Set *LVAL
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to lval_memory, lval_register, or not_lval, depending on whether
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the value was fetched from memory, from a register, or in a strange
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and non-modifiable way (e.g. a frame pointer which was calculated
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rather than fetched). Set *ADDRP to the address, either in memory
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on as a REGISTER_BYTE offset into the registers array.
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Note that this implementation never sets *LVAL to not_lval. But
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it can be replaced by defining GET_SAVED_REGISTER and supplying
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your own.
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The argument RAW_BUFFER must point to aligned memory. */
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void
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get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval)
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char *raw_buffer;
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int *optimized;
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CORE_ADDR *addrp;
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FRAME frame;
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int regnum;
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enum lval_type *lval;
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{
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CORE_ADDR addr;
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/* Normal systems don't optimize out things with register numbers. */
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if (optimized != NULL)
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*optimized = 0;
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addr = find_saved_register (frame, regnum);
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if (addr != 0)
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{
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if (lval != NULL)
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*lval = lval_memory;
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if (regnum == SP_REGNUM)
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{
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if (raw_buffer != NULL)
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{
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/* Put it back in target format. */
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store_address (raw_buffer, REGISTER_RAW_SIZE (regnum), addr);
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}
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if (addrp != NULL)
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*addrp = 0;
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return;
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}
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if (raw_buffer != NULL)
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read_memory (addr, raw_buffer, REGISTER_RAW_SIZE (regnum));
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}
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else
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{
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if (lval != NULL)
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*lval = lval_register;
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addr = REGISTER_BYTE (regnum);
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if (raw_buffer != NULL)
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read_register_gen (regnum, raw_buffer);
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}
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if (addrp != NULL)
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*addrp = addr;
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}
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#endif /* GET_SAVED_REGISTER. */
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/* Copy the bytes of register REGNUM, relative to the current stack frame,
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into our memory at MYADDR, in target byte order.
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The number of bytes copied is REGISTER_RAW_SIZE (REGNUM).
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Returns 1 if could not be read, 0 if could. */
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int
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read_relative_register_raw_bytes (regnum, myaddr)
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int regnum;
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char *myaddr;
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{
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int optim;
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if (regnum == FP_REGNUM && selected_frame)
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{
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/* Put it back in target format. */
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store_address (myaddr, REGISTER_RAW_SIZE(FP_REGNUM),
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FRAME_FP(selected_frame));
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return 0;
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}
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get_saved_register (myaddr, &optim, (CORE_ADDR *) NULL, selected_frame,
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regnum, (enum lval_type *)NULL);
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return optim;
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}
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/* Return a `value' with the contents of register REGNUM
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in its virtual format, with the type specified by
|
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REGISTER_VIRTUAL_TYPE. */
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value
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value_of_register (regnum)
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int regnum;
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{
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CORE_ADDR addr;
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int optim;
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register value reg_val;
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char raw_buffer[MAX_REGISTER_RAW_SIZE];
|
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enum lval_type lval;
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get_saved_register (raw_buffer, &optim, &addr,
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selected_frame, regnum, &lval);
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reg_val = allocate_value (REGISTER_VIRTUAL_TYPE (regnum));
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|
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/* Convert raw data to virtual format if necessary. */
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|
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#ifdef REGISTER_CONVERTIBLE
|
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if (REGISTER_CONVERTIBLE (regnum))
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{
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REGISTER_CONVERT_TO_VIRTUAL (regnum, REGISTER_VIRTUAL_TYPE (regnum),
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raw_buffer, VALUE_CONTENTS_RAW (reg_val));
|
||
}
|
||
else
|
||
#endif
|
||
memcpy (VALUE_CONTENTS_RAW (reg_val), raw_buffer,
|
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REGISTER_RAW_SIZE (regnum));
|
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VALUE_LVAL (reg_val) = lval;
|
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VALUE_ADDRESS (reg_val) = addr;
|
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VALUE_REGNO (reg_val) = regnum;
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VALUE_OPTIMIZED_OUT (reg_val) = optim;
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return reg_val;
|
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}
|
||
|
||
/* 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. */
|
||
char register_valid[NUM_REGS];
|
||
|
||
/* Indicate that registers may have changed, so invalidate the cache. */
|
||
void
|
||
registers_changed ()
|
||
{
|
||
int i;
|
||
for (i = 0; i < NUM_REGS; i++)
|
||
register_valid[i] = 0;
|
||
}
|
||
|
||
/* Indicate that all registers have been fetched, so mark them all valid. */
|
||
void
|
||
registers_fetched ()
|
||
{
|
||
int i;
|
||
for (i = 0; i < NUM_REGS; i++)
|
||
register_valid[i] = 1;
|
||
}
|
||
|
||
/* Copy LEN bytes of consecutive data from registers
|
||
starting with the REGBYTE'th byte of register data
|
||
into memory at MYADDR. */
|
||
|
||
void
|
||
read_register_bytes (regbyte, myaddr, len)
|
||
int regbyte;
|
||
char *myaddr;
|
||
int len;
|
||
{
|
||
/* Fetch all registers. */
|
||
int i;
|
||
for (i = 0; i < NUM_REGS; i++)
|
||
if (!register_valid[i])
|
||
{
|
||
target_fetch_registers (-1);
|
||
break;
|
||
}
|
||
if (myaddr != NULL)
|
||
memcpy (myaddr, ®isters[regbyte], len);
|
||
}
|
||
|
||
/* 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 (!register_valid[regno])
|
||
target_fetch_registers (regno);
|
||
memcpy (myaddr, ®isters[REGISTER_BYTE (regno)],
|
||
REGISTER_RAW_SIZE (regno));
|
||
}
|
||
|
||
/* Copy LEN bytes of consecutive data from memory at MYADDR
|
||
into registers starting with the REGBYTE'th byte of register data. */
|
||
|
||
void
|
||
write_register_bytes (regbyte, myaddr, len)
|
||
int regbyte;
|
||
char *myaddr;
|
||
int len;
|
||
{
|
||
/* Make sure the entire registers array is valid. */
|
||
read_register_bytes (0, (char *)NULL, REGISTER_BYTES);
|
||
memcpy (®isters[regbyte], myaddr, len);
|
||
target_store_registers (-1);
|
||
}
|
||
|
||
/* 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 (!register_valid[regno])
|
||
target_fetch_registers (regno);
|
||
|
||
return extract_address (®isters[REGISTER_BYTE (regno)],
|
||
REGISTER_RAW_SIZE(regno));
|
||
}
|
||
|
||
/* Registers we shouldn't try to store. */
|
||
#if !defined (CANNOT_STORE_REGISTER)
|
||
#define CANNOT_STORE_REGISTER(regno) 0
|
||
#endif
|
||
|
||
/* Store VALUE, into the raw contents of register number REGNO. */
|
||
/* FIXME: The val arg should probably be a LONGEST. */
|
||
|
||
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;
|
||
|
||
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])
|
||
{
|
||
if (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);
|
||
}
|
||
|
||
/* 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. */
|
||
|
||
void
|
||
supply_register (regno, val)
|
||
int regno;
|
||
char *val;
|
||
{
|
||
register_valid[regno] = 1;
|
||
memcpy (®isters[REGISTER_BYTE (regno)], val, 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
|
||
}
|
||
|
||
/* 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_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
|
||
read_var_value (var, frame)
|
||
register struct symbol *var;
|
||
FRAME frame;
|
||
{
|
||
register value v;
|
||
struct frame_info *fi;
|
||
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. */
|
||
len = TYPE_LENGTH (type);
|
||
|
||
if (frame == 0) 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. */
|
||
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:
|
||
addr = SYMBOL_VALUE_ADDRESS (var);
|
||
break;
|
||
|
||
case LOC_ARG:
|
||
fi = get_frame_info (frame);
|
||
if (fi == NULL)
|
||
return 0;
|
||
addr = FRAME_ARGS_ADDRESS (fi);
|
||
if (!addr)
|
||
{
|
||
return 0;
|
||
}
|
||
addr += SYMBOL_VALUE (var);
|
||
break;
|
||
|
||
case LOC_REF_ARG:
|
||
fi = get_frame_info (frame);
|
||
if (fi == NULL)
|
||
return 0;
|
||
addr = FRAME_ARGS_ADDRESS (fi);
|
||
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:
|
||
fi = get_frame_info (frame);
|
||
if (fi == NULL)
|
||
return 0;
|
||
addr = FRAME_LOCALS_ADDRESS (fi);
|
||
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:
|
||
VALUE_ADDRESS (v) = BLOCK_START (SYMBOL_BLOCK_VALUE (var));
|
||
return v;
|
||
|
||
case LOC_REGISTER:
|
||
case LOC_REGPARM:
|
||
case LOC_REGPARM_ADDR:
|
||
{
|
||
struct block *b;
|
||
|
||
if (frame == NULL)
|
||
return 0;
|
||
b = get_frame_block (frame);
|
||
|
||
v = value_from_register (type, SYMBOL_VALUE (var), frame);
|
||
|
||
if (SYMBOL_CLASS (var) == LOC_REGPARM_ADDR)
|
||
{
|
||
addr = *(CORE_ADDR *)VALUE_CONTENTS (v);
|
||
VALUE_LVAL (v) = lval_memory;
|
||
}
|
||
else
|
||
return v;
|
||
}
|
||
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. */
|
||
|
||
value
|
||
value_from_register (type, regnum, frame)
|
||
struct type *type;
|
||
int regnum;
|
||
FRAME frame;
|
||
{
|
||
char raw_buffer [MAX_REGISTER_RAW_SIZE];
|
||
CORE_ADDR addr;
|
||
int optim;
|
||
value v = allocate_value (type);
|
||
int len = TYPE_LENGTH (type);
|
||
char *value_bytes = 0;
|
||
int value_bytes_copied = 0;
|
||
int num_storage_locs;
|
||
enum lval_type lval;
|
||
|
||
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 (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 (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 (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);
|
||
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
|
||
if (len < REGISTER_RAW_SIZE (regnum))
|
||
{
|
||
/* Big-endian, and we want less than full size. */
|
||
VALUE_OFFSET (v) = REGISTER_RAW_SIZE (regnum) - len;
|
||
}
|
||
#endif
|
||
|
||
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
|
||
locate_var_value (var, frame)
|
||
register struct symbol *var;
|
||
FRAME frame;
|
||
{
|
||
CORE_ADDR addr = 0;
|
||
struct type *type = SYMBOL_TYPE (var);
|
||
value 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)
|
||
{
|
||
addr = VALUE_ADDRESS (lazy_value);
|
||
return value_from_longest (lookup_pointer_type (type), (LONGEST) addr);
|
||
}
|
||
|
||
/* 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 */
|
||
}
|