/* Find a variable's value in memory, for GDB, the GNU debugger.
- Copyright (C) 1986, 1987, 1989 Free Software Foundation, Inc.
+ Copyright 1986, 1987, 1989, 1991 Free Software Foundation, Inc.
This file is part of GDB.
-GDB is free software; you can redistribute it and/or modify
+This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 1, or (at your option)
-any later version.
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
-GDB is distributed in the hope that it will be useful,
+This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
-along with GDB; see the file COPYING. If not, write to
-the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+along with this program; if not, write to the Free Software
+Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
-#include <stdio.h>
#include "defs.h"
-#include "param.h"
#include "symtab.h"
+#include "gdbtypes.h"
#include "frame.h"
#include "value.h"
#include "gdbcore.h"
#include "inferior.h"
#include "target.h"
+/* Basic byte-swapping routines. GDB has needed these for a long time...
+ All extract a target-format integer at ADDR which is LEN bytes long. */
+
+#if TARGET_CHAR_BIT != 8 || HOST_CHAR_BIT != 8
+ /* 8 bit characters are a pretty safe assumption these days, so we
+ assume it throughout all these swapping routines. If we had to deal with
+ 9 bit characters, we would need to make len be in bits and would have
+ to re-write these routines... */
+ you lose
+#endif
+
+LONGEST
+extract_signed_integer (addr, len)
+ PTR addr;
+ int len;
+{
+ LONGEST retval;
+ unsigned char *p;
+ unsigned char *startaddr = (unsigned char *)addr;
+ unsigned char *endaddr = startaddr + len;
+
+ if (len > sizeof (LONGEST))
+ error ("\
+That operation is not available on integers of more than %d bytes.",
+ sizeof (LONGEST));
+
+ /* Start at the most significant end of the integer, and work towards
+ the least significant. */
+#if TARGET_BYTE_ORDER == BIG_ENDIAN
+ p = startaddr;
+#else
+ p = endaddr - 1;
+#endif
+ /* Do the sign extension once at the start. */
+ retval = (*p ^ 0x80) - 0x80;
+#if TARGET_BYTE_ORDER == BIG_ENDIAN
+ for (++p; p < endaddr; ++p)
+#else
+ for (--p; p >= startaddr; --p)
+#endif
+ {
+ retval = (retval << 8) | *p;
+ }
+ return retval;
+}
+
+unsigned LONGEST
+extract_unsigned_integer (addr, len)
+ PTR addr;
+ int len;
+{
+ unsigned LONGEST retval;
+ unsigned char *p;
+ unsigned char *startaddr = (unsigned char *)addr;
+ unsigned char *endaddr = startaddr + len;
+
+ if (len > sizeof (unsigned LONGEST))
+ error ("\
+That operation is not available on integers of more than %d bytes.",
+ sizeof (unsigned LONGEST));
+
+ /* Start at the most significant end of the integer, and work towards
+ the least significant. */
+ retval = 0;
+#if TARGET_BYTE_ORDER == BIG_ENDIAN
+ for (p = startaddr; p < endaddr; ++p)
+#else
+ for (p = endaddr - 1; p >= startaddr; --p)
+#endif
+ {
+ retval = (retval << 8) | *p;
+ }
+ return retval;
+}
+
+CORE_ADDR
+extract_address (addr, len)
+ PTR addr;
+ int len;
+{
+ /* Assume a CORE_ADDR can fit in a LONGEST (for now). Not sure
+ whether we want this to be true eventually. */
+ return extract_unsigned_integer (addr, len);
+}
+
+void
+store_signed_integer (addr, len, val)
+ PTR addr;
+ int len;
+ LONGEST val;
+{
+ unsigned char *p;
+ unsigned char *startaddr = (unsigned char *)addr;
+ unsigned char *endaddr = startaddr + len;
+
+ /* Start at the least significant end of the integer, and work towards
+ the most significant. */
+#if TARGET_BYTE_ORDER == BIG_ENDIAN
+ for (p = endaddr - 1; p >= startaddr; --p)
+#else
+ for (p = startaddr; p < endaddr; ++p)
+#endif
+ {
+ *p = val & 0xff;
+ val >>= 8;
+ }
+}
+
+void
+store_unsigned_integer (addr, len, val)
+ PTR addr;
+ int len;
+ unsigned LONGEST val;
+{
+ unsigned char *p;
+ unsigned char *startaddr = (unsigned char *)addr;
+ unsigned char *endaddr = startaddr + len;
+
+ /* Start at the least significant end of the integer, and work towards
+ the most significant. */
+#if TARGET_BYTE_ORDER == BIG_ENDIAN
+ for (p = endaddr - 1; p >= startaddr; --p)
+#else
+ for (p = startaddr; p < endaddr; ++p)
+#endif
+ {
+ *p = val & 0xff;
+ val >>= 8;
+ }
+}
+
+void
+store_address (addr, len, val)
+ PTR addr;
+ int len;
+ CORE_ADDR val;
+{
+ /* Assume a CORE_ADDR can fit in a LONGEST (for now). Not sure
+ whether we want this to be true eventually. */
+ store_unsigned_integer (addr, len, (LONGEST)val);
+}
+\f
#if !defined (GET_SAVED_REGISTER)
/* Return the address in which frame FRAME's value of register REGNUM
return addr;
}
-/* Find register number REGNUM relative to FRAME and put its
- (raw) 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
+/* 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.
your own.
The argument RAW_BUFFER must point to aligned memory. */
+
void
get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval)
char *raw_buffer;
if (optimized != NULL)
*optimized = 0;
addr = find_saved_register (frame, regnum);
- if (addr != NULL)
+ if (addr != 0)
{
if (lval != NULL)
*lval = lval_memory;
if (regnum == SP_REGNUM)
{
if (raw_buffer != NULL)
- *(CORE_ADDR *)raw_buffer = addr;
+ {
+ /* Put it back in target format. */
+ store_address (raw_buffer, REGISTER_RAW_SIZE (regnum), addr);
+ }
if (addrp != NULL)
*addrp = 0;
return;
int optim;
if (regnum == FP_REGNUM && selected_frame)
{
- bcopy (&FRAME_FP(selected_frame), myaddr, sizeof (CORE_ADDR));
- SWAP_TARGET_AND_HOST (myaddr, sizeof (CORE_ADDR)); /* in target order */
+ /* Put it back in target format. */
+ store_address (myaddr, REGISTER_RAW_SIZE(FP_REGNUM),
+ FRAME_FP(selected_frame));
return 0;
}
get_saved_register (raw_buffer, &optim, &addr,
selected_frame, regnum, &lval);
- target_convert_to_virtual (regnum, raw_buffer, virtual_buffer);
+ REGISTER_CONVERT_TO_VIRTUAL (regnum, raw_buffer, virtual_buffer);
val = allocate_value (REGISTER_VIRTUAL_TYPE (regnum));
- bcopy (virtual_buffer, VALUE_CONTENTS_RAW (val),
- REGISTER_VIRTUAL_SIZE (regnum));
+ memcpy (VALUE_CONTENTS_RAW (val), virtual_buffer,
+ REGISTER_VIRTUAL_SIZE (regnum));
VALUE_LVAL (val) = lval;
VALUE_ADDRESS (val) = addr;
VALUE_REGNO (val) = regnum;
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 bcopy's around `registers',
+ 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];
break;
}
if (myaddr != NULL)
- bcopy (®isters[regbyte], myaddr, len);
+ memcpy (myaddr, ®isters[regbyte], len);
}
/* Read register REGNO into memory at MYADDR, which must be large enough
{
if (!register_valid[regno])
target_fetch_registers (regno);
- bcopy (®isters[REGISTER_BYTE (regno)], myaddr, REGISTER_RAW_SIZE (regno));
+ memcpy (myaddr, ®isters[REGISTER_BYTE (regno)],
+ REGISTER_RAW_SIZE (regno));
}
/* Copy LEN bytes of consecutive data from memory at MYADDR
{
/* Make sure the entire registers array is valid. */
read_register_bytes (0, (char *)NULL, REGISTER_BYTES);
- bcopy (myaddr, ®isters[regbyte], len);
+ memcpy (®isters[regbyte], myaddr, len);
target_store_registers (-1);
}
-/* Return the contents of register REGNO, regarding it as an integer. */
+/* 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;
{
- int reg;
if (!register_valid[regno])
target_fetch_registers (regno);
- /* FIXME, this loses when REGISTER_RAW_SIZE (regno) != sizeof (int) */
- reg = *(int *) ®isters[REGISTER_BYTE (regno)];
- SWAP_TARGET_AND_HOST (®, sizeof (int));
- return reg;
+
+ return extract_address (®isters[REGISTER_BYTE (regno)],
+ REGISTER_RAW_SIZE(regno));
}
/* Registers we shouldn't try to store. */
#define CANNOT_STORE_REGISTER(regno) 0
#endif
-/* Store VALUE in the register number REGNO, regarded as an integer. */
+/* 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, 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;
- SWAP_TARGET_AND_HOST (&val, sizeof (int));
+ 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;
- /* FIXME, this loses when REGISTER_RAW_SIZE (regno) != sizeof (int) */
- /* FIXME, this depends on REGISTER_BYTE (regno) being aligned for host */
- *(int *) ®isters[REGISTER_BYTE (regno)] = val;
target_store_registers (regno);
}
char *val;
{
register_valid[regno] = 1;
- bcopy (val, ®isters[REGISTER_BYTE (regno)], REGISTER_RAW_SIZE (regno));
+ 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
}
\f
/* Given a struct symbol for a variable,
switch (SYMBOL_CLASS (var))
{
case LOC_CONST:
- bcopy (&SYMBOL_VALUE (var), VALUE_CONTENTS_RAW (v), len);
- SWAP_TARGET_AND_HOST (VALUE_CONTENTS_RAW (v), len);
+ /* 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:
- addr = SYMBOL_VALUE_ADDRESS (var);
- bcopy (&addr, VALUE_CONTENTS_RAW (v), len);
- SWAP_TARGET_AND_HOST (VALUE_CONTENTS_RAW (v), len);
+ /* 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:
- addr = SYMBOL_VALUE_ADDRESS (var);
- bcopy (addr, VALUE_CONTENTS_RAW (v), len);
- VALUE_LVAL (v) = not_lval;
- return v;
+ {
+ 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:
- case LOC_EXTERNAL:
addr = SYMBOL_VALUE_ADDRESS (var);
break;
-/* Nonzero if a struct which is located in a register or a LOC_ARG
- really contains
- the address of the struct, not the struct itself. GCC_P is nonzero
- if the function was compiled with GCC. */
-#if !defined (REG_STRUCT_HAS_ADDR)
-#define REG_STRUCT_HAS_ADDR(gcc_p) 0
-#endif
-
case LOC_ARG:
fi = get_frame_info (frame);
if (fi == NULL)
return 0;
addr = FRAME_ARGS_ADDRESS (fi);
- if (!addr) {
- return 0;
- }
+ 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;
- }
+ if (!addr)
+ {
+ return 0;
+ }
addr += SYMBOL_VALUE (var);
- read_memory (addr, &addr, sizeof (CORE_ADDR));
+ 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 = SYMBOL_VALUE (var) + FRAME_LOCALS_ADDRESS (fi);
+ 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_REGISTER:
case LOC_REGPARM:
+ case LOC_REGPARM_ADDR:
{
struct block *b;
v = value_from_register (type, SYMBOL_VALUE (var), frame);
- if (REG_STRUCT_HAS_ADDR (BLOCK_GCC_COMPILED (b))
- && TYPE_CODE (type) == TYPE_CODE_STRUCT)
- addr = *(CORE_ADDR *)VALUE_CONTENTS (v);
+ 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;
((len - 1) / REGISTER_RAW_SIZE (regnum)) + 1 :
1);
- if (num_storage_locs > 1)
+ if (num_storage_locs > 1
+#ifdef GDB_TARGET_IS_H8500
+ || TYPE_CODE (type) == TYPE_CODE_PTR
+#endif
+ )
{
/* Value spread across multiple storage locations. */
/* Copy all of the data out, whereever it may be. */
- for (local_regnum = regnum;
- value_bytes_copied < len;
- (value_bytes_copied += REGISTER_RAW_SIZE (local_regnum),
- ++local_regnum))
+#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)
{
- get_saved_register (value_bytes + value_bytes_copied,
+ 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,
- local_regnum,
+ regnum,
&lval);
+
if (lval == lval_register)
reg_stor++;
else
{
mem_stor++;
-
- if (regnum == local_regnum)
- first_addr = addr;
-
- mem_tracking =
- (mem_tracking
- && (regnum == local_regnum
- || addr == last_addr));
+ 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))
endian machines. */
/* Copy into the contents section of the value. */
- bcopy (value_bytes, VALUE_CONTENTS_RAW (v), len);
+ 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;
}
/* Convert the raw contents to virtual contents.
(Just copy them if the formats are the same.) */
- target_convert_to_virtual (regnum, raw_buffer, virtual_buffer);
+ REGISTER_CONVERT_TO_VIRTUAL (regnum, raw_buffer, virtual_buffer);
if (REGISTER_CONVERTIBLE (regnum))
{
with raw type `extended' and virtual type `double'.
Fetch it as a `double' and then convert to `float'. */
v = allocate_value (REGISTER_VIRTUAL_TYPE (regnum));
- bcopy (virtual_buffer, VALUE_CONTENTS_RAW (v), len);
+ memcpy (VALUE_CONTENTS_RAW (v), virtual_buffer, len);
v = value_cast (type, v);
}
else
- bcopy (virtual_buffer, VALUE_CONTENTS_RAW (v), len);
+ memcpy (VALUE_CONTENTS_RAW (v), virtual_buffer, len);
}
else
{
}
#endif
- bcopy (virtual_buffer + VALUE_OFFSET (v),
- VALUE_CONTENTS_RAW (v), len);
+ memcpy (VALUE_CONTENTS_RAW (v), virtual_buffer + VALUE_OFFSET (v), len);
}
return v;
}
\f
-/* Given a struct symbol for a variable,
+/* Given a struct symbol for a variable or function,
and a stack frame id,
- return a (pointer to a) struct value containing the variable's address. */
+ return a (pointer to a) struct value containing the properly typed
+ address. */
value
locate_var_value (var, frame)
{
CORE_ADDR addr = 0;
struct type *type = SYMBOL_TYPE (var);
- struct type *result_type;
value lazy_value;
/* Evaluate it first; if the result is a memory address, we're fine.
lazy_value = read_var_value (var, frame);
if (lazy_value == 0)
- error ("Address of \"%s\" is unknown.", SYMBOL_NAME (var));
+ error ("Address of \"%s\" is unknown.", SYMBOL_SOURCE_NAME (var));
- if (VALUE_LAZY (lazy_value))
+ if (VALUE_LAZY (lazy_value)
+ || TYPE_CODE (type) == TYPE_CODE_FUNC)
{
addr = VALUE_ADDRESS (lazy_value);
-
- /* C++: The "address" of a reference should yield the address
- * of the object pointed to. So force an extra de-reference. */
-
- if (TYPE_CODE (type) == TYPE_CODE_REF)
- {
- char *buf = alloca (TYPE_LENGTH (type));
- read_memory (addr, buf, TYPE_LENGTH (type));
- addr = unpack_pointer (type, buf);
- type = TYPE_TARGET_TYPE (type);
- }
-
- /* Address of an array is of the type of address of it's elements. */
- result_type =
- lookup_pointer_type (TYPE_CODE (type) == TYPE_CODE_ARRAY ?
- TYPE_TARGET_TYPE (type) : type);
-
- return value_cast (result_type,
- value_from_long (builtin_type_long, (LONGEST) addr));
+ return value_from_longest (lookup_pointer_type (type), (LONGEST) addr);
}
/* Not a memory address; check what the problem was. */
case lval_register:
case lval_reg_frame_relative:
error ("Address requested for identifier \"%s\" which is in a register.",
- SYMBOL_NAME (var));
+ SYMBOL_SOURCE_NAME (var));
break;
default:
error ("Can't take address of \"%s\" which isn't an lvalue.",
- SYMBOL_NAME (var));
+ SYMBOL_SOURCE_NAME (var));
break;
}
return 0; /* For lint -- never reached */
projects / deliverable / binutils-gdb.git / blobdiff