#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 = ((LONGEST)*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
+/* Swap LEN bytes at BUFFER between target and host byte-order. This is
+ the wrong way to do byte-swapping because it assumes that you have a way
+ to have a host variable of exactly the right size. Once extract_floating
+ and store_floating have been fixed, this can go away. */
+#if TARGET_BYTE_ORDER == HOST_BYTE_ORDER
+#define SWAP_TARGET_AND_HOST(buffer,len)
+#else /* Target and host byte order differ. */
+#define SWAP_TARGET_AND_HOST(buffer,len) \
+ { \
+ char tmp; \
+ char *p = (char *)(buffer); \
+ char *q = ((char *)(buffer)) + len - 1; \
+ for (; p < q; p++, q--) \
+ { \
+ tmp = *q; \
+ *q = *p; \
+ *p = tmp; \
+ } \
+ }
+#endif /* Target and host byte order differ. */
+
+/* There are many problems with floating point cross-debugging.
+
+ 1. These routines only handle byte-swapping, not conversion of
+ formats. So if host is IEEE floating and target is VAX floating,
+ or vice-versa, it loses. This means that we can't (yet) use these
+ routines for extendeds. Extendeds are handled by
+ REGISTER_CONVERTIBLE. What we want is a fixed version of
+ ieee-float.c (the current version can't deal with single or double,
+ and I suspect it is probably broken for some extendeds too).
+
+ 2. We can't deal with it if there is more than one floating point
+ format in use. This has to be fixed at the unpack_double level.
+
+ 3. We probably should have a LONGEST_DOUBLE or DOUBLEST or whatever
+ we want to call it which is long double where available. */
+
+double
+extract_floating (addr, len)
+ PTR addr;
+ int len;
+{
+ if (len == sizeof (float))
+ {
+ float retval;
+ memcpy (&retval, addr, sizeof (retval));
+ SWAP_TARGET_AND_HOST (&retval, sizeof (retval));
+ return retval;
+ }
+ else if (len == sizeof (double))
+ {
+ double retval;
+ memcpy (&retval, addr, sizeof (retval));
+ SWAP_TARGET_AND_HOST (&retval, sizeof (retval));
+ return retval;
+ }
+ else
+ {
+ error ("Can't deal with a floating point number of %d bytes.", len);
+ }
+}
+
+void
+store_floating (addr, len, val)
+ PTR addr;
+ int len;
+ double val;
+{
+ if (len == sizeof (float))
+ {
+ float floatval = val;
+ SWAP_TARGET_AND_HOST (&floatval, sizeof (floatval));
+ memcpy (addr, &floatval, sizeof (floatval));
+ }
+ else if (len == sizeof (double))
+ {
+ SWAP_TARGET_AND_HOST (&val, sizeof (val));
+ memcpy (addr, &val, sizeof (val));
+ }
+ else
+ {
+ error ("Can't deal with a floating point number of %d bytes.", len);
+ }
+}
+\f
#if !defined (GET_SAVED_REGISTER)
/* Return the address in which frame FRAME's value of register REGNUM
{
if (raw_buffer != NULL)
{
- *(CORE_ADDR *)raw_buffer = addr;
- /* Put it back in target byte order. */
- SWAP_TARGET_AND_HOST (raw_buffer, sizeof (CORE_ADDR));
+ /* Put it back in target format. */
+ store_address (raw_buffer, REGISTER_RAW_SIZE (regnum), addr);
}
if (addrp != NULL)
*addrp = 0;
int optim;
if (regnum == FP_REGNUM && selected_frame)
{
- memcpy (myaddr, &FRAME_FP(selected_frame), REGISTER_RAW_SIZE(FP_REGNUM));
- SWAP_TARGET_AND_HOST (myaddr, REGISTER_RAW_SIZE(FP_REGNUM)); /* in target order */
+ /* Put it back in target format. */
+ store_address (myaddr, REGISTER_RAW_SIZE(FP_REGNUM),
+ FRAME_FP(selected_frame));
return 0;
}
int optim;
register value val;
char raw_buffer[MAX_REGISTER_RAW_SIZE];
- char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE];
enum lval_type lval;
get_saved_register (raw_buffer, &optim, &addr,
selected_frame, regnum, &lval);
- REGISTER_CONVERT_TO_VIRTUAL (regnum, raw_buffer, virtual_buffer);
val = allocate_value (REGISTER_VIRTUAL_TYPE (regnum));
- memcpy (VALUE_CONTENTS_RAW (val), virtual_buffer,
- REGISTER_VIRTUAL_SIZE (regnum));
+
+ /* Convert raw data to virtual format if necessary. */
+
+#ifdef REGISTER_CONVERTIBLE
+ if (REGISTER_CONVERTIBLE (regnum))
+ {
+ REGISTER_CONVERT_TO_VIRTUAL (regnum, REGISTER_VIRTUAL_TYPE (regnum),
+ raw_buffer, VALUE_CONTENTS_RAW (val));
+ }
+ else
+#endif
+ memcpy (VALUE_CONTENTS_RAW (val), raw_buffer,
+ REGISTER_RAW_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];
target_store_registers (-1);
}
-/* Return the contents of register REGNO, regarding it as an integer. */
-/* FIXME, this loses when the REGISTER_VIRTUAL (REGNO) is true. Also,
- why is the return type CORE_ADDR rather than some integer type? */
+/* 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;
{
- unsigned short sval;
- unsigned int ival;
- unsigned long lval;
- LONGEST llval;
-
- int size;
-
if (!register_valid[regno])
target_fetch_registers (regno);
- size = REGISTER_RAW_SIZE(regno);
-
- if (size == sizeof (unsigned char))
- return registers[REGISTER_BYTE (regno)];
- else if (size == sizeof (sval))
- {
- memcpy (&sval, ®isters[REGISTER_BYTE (regno)], sizeof (sval));
- SWAP_TARGET_AND_HOST (&sval, sizeof (sval));
- return sval;
- }
- else if (size == sizeof (ival))
- {
- memcpy (&ival, ®isters[REGISTER_BYTE (regno)], sizeof (ival));
- SWAP_TARGET_AND_HOST (&ival, sizeof (ival));
- return ival;
- }
- else if (size == sizeof (lval))
- {
- memcpy (&lval, ®isters[REGISTER_BYTE (regno)], sizeof (lval));
- SWAP_TARGET_AND_HOST (&lval, sizeof (lval));
- return lval;
- }
- else if (size == sizeof (llval))
- {
- memcpy (&llval, ®isters[REGISTER_BYTE (regno)], sizeof (llval));
- SWAP_TARGET_AND_HOST (&llval, sizeof (llval));
- return llval;
- }
- else
- {
- error ("GDB Internal Error in read_register() for register %d, size %d",
- regno, REGISTER_RAW_SIZE(regno));
- }
+ 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. */
-/* FIXME, this loses when REGISTER_VIRTUAL (REGNO) is true. Also,
- shouldn't the val arg be a LONGEST or something? */
+/* 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;
+ int regno;
+ LONGEST val;
{
- unsigned char cval;
- unsigned short sval;
- unsigned int ival;
- unsigned long lval;
- LONGEST llval;
+ PTR buf;
int size;
- PTR ptr;
-
+
/* 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. */
- size = REGISTER_RAW_SIZE(regno);
-
- if (size == sizeof(cval))
- {
- ptr = (PTR) &cval;
- cval = val;
- }
- else if (size == sizeof(sval))
- {
- ptr = (PTR) &sval;
- sval = val;
- }
- else if (size == sizeof(ival))
- {
- ptr = (PTR) &ival;
- ival = val;
- }
- else if (size == sizeof(lval))
- {
- ptr = (PTR) &lval;
- lval = val;
- }
- else if (size == sizeof(llval))
- {
- ptr = (PTR) &llval;
- llval = val;
- }
- else
- {
- error ("GDB Internal Error in write_register() for register %d, size %d",
- regno, size);
- }
-
- SWAP_TARGET_AND_HOST (ptr, size);
if (register_valid [regno])
{
- if (memcmp (®isters[REGISTER_BYTE (regno)],
- ptr, size) == 0)
+ if (memcmp (®isters[REGISTER_BYTE (regno)], buf, size) == 0)
return;
}
target_prepare_to_store ();
- memcpy (®isters[REGISTER_BYTE (regno)], ptr, size);
+ memcpy (®isters[REGISTER_BYTE (regno)], buf, size);
register_valid [regno] = 1;
#endif
}
\f
+/* 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.
switch (SYMBOL_CLASS (var))
{
case LOC_CONST:
- memcpy (VALUE_CONTENTS_RAW (v), &SYMBOL_VALUE (var), 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);
- memcpy (VALUE_CONTENTS_RAW (v), &addr, 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;
break;
case LOC_ARG:
- if (SYMBOL_BASEREG_VALID (var))
- {
- addr = FRAME_GET_BASEREG_VALUE (frame, SYMBOL_BASEREG (var));
- }
- else
- {
- fi = get_frame_info (frame);
- if (fi == NULL)
- return 0;
- addr = FRAME_ARGS_ADDRESS (fi);
- }
+ 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:
- if (SYMBOL_BASEREG_VALID (var))
- {
- addr = FRAME_GET_BASEREG_VALUE (frame, SYMBOL_BASEREG (var));
- }
- else
- {
- fi = get_frame_info (frame);
- if (fi == NULL)
- return 0;
- addr = FRAME_ARGS_ADDRESS (fi);
- }
+ fi = get_frame_info (frame);
+ if (fi == NULL)
+ return 0;
+ addr = FRAME_ARGS_ADDRESS (fi);
if (!addr)
{
return 0;
}
addr += SYMBOL_VALUE (var);
- read_memory (addr, (char *) &addr, sizeof (CORE_ADDR));
+ addr = read_memory_unsigned_integer
+ (addr, TARGET_PTR_BIT / TARGET_CHAR_BIT);
break;
-
+
case LOC_LOCAL:
case LOC_LOCAL_ARG:
- if (SYMBOL_BASEREG_VALID (var))
- {
- addr = FRAME_GET_BASEREG_VALUE (frame, SYMBOL_BASEREG (var));
- }
- else
- {
- fi = get_frame_info (frame);
- if (fi == NULL)
- return 0;
- addr = FRAME_LOCALS_ADDRESS (fi);
- }
+ 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;
FRAME frame;
{
char raw_buffer [MAX_REGISTER_RAW_SIZE];
- char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE];
CORE_ADDR addr;
int optim;
value v = allocate_value (type);
int mem_stor = 0, reg_stor = 0;
int mem_tracking = 1;
CORE_ADDR last_addr = 0;
- CORE_ADDR first_addr;
+ CORE_ADDR first_addr = 0;
value_bytes = (char *) alloca (len + MAX_REGISTER_RAW_SIZE);
VALUE_OPTIMIZED_OUT (v) = optim;
VALUE_LVAL (v) = lval;
VALUE_ADDRESS (v) = addr;
+
+ /* Convert raw data to virtual format if necessary. */
- /* Convert the raw contents to virtual contents.
- (Just copy them if the formats are the same.) */
-
- REGISTER_CONVERT_TO_VIRTUAL (regnum, raw_buffer, virtual_buffer);
-
+#ifdef REGISTER_CONVERTIBLE
if (REGISTER_CONVERTIBLE (regnum))
{
- /* When the raw and virtual formats differ, the virtual format
- corresponds to a specific data type. If we want that type,
- copy the data into the value.
- Otherwise, do a type-conversion. */
-
- if (type != REGISTER_VIRTUAL_TYPE (regnum))
- {
- /* eg a variable of type `float' in a 68881 register
- 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));
- memcpy (VALUE_CONTENTS_RAW (v), virtual_buffer, len);
- v = value_cast (type, v);
- }
- else
- memcpy (VALUE_CONTENTS_RAW (v), virtual_buffer, len);
+ REGISTER_CONVERT_TO_VIRTUAL (regnum, type,
+ raw_buffer, VALUE_CONTENTS_RAW (v));
}
else
+#endif
{
/* Raw and virtual formats are the same for this register. */
}
#endif
- memcpy (VALUE_CONTENTS_RAW (v), virtual_buffer + VALUE_OFFSET (v), len);
+ memcpy (VALUE_CONTENTS_RAW (v), raw_buffer + VALUE_OFFSET (v), len);
}
return v;
projects / deliverable / binutils-gdb.git / blobdiff