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 to use floatformat.h, but that
+ doesn't yet handle VAX floating at all.
+
+ 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
{
CORE_ADDR addr;
int optim;
- register value val;
+ register value reg_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));
- VALUE_LVAL (val) = lval;
- VALUE_ADDRESS (val) = addr;
- VALUE_REGNO (val) = regnum;
- VALUE_OPTIMIZED_OUT (val) = optim;
- return val;
+ reg_val = allocate_value (REGISTER_VIRTUAL_TYPE (regnum));
+
+ /* Convert raw data to virtual format if necessary. */
+
+#ifdef REGISTER_CONVERTIBLE
+ if (REGISTER_CONVERTIBLE (regnum))
+ {
+ REGISTER_CONVERT_TO_VIRTUAL (regnum, REGISTER_VIRTUAL_TYPE (regnum),
+ raw_buffer, VALUE_CONTENTS_RAW (reg_val));
+ }
+ else
+#endif
+ memcpy (VALUE_CONTENTS_RAW (reg_val), raw_buffer,
+ REGISTER_RAW_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;
}
\f
/* Low level examining and depositing of registers.
void
write_register (regno, val)
int regno;
- long val;
+ LONGEST val;
{
PTR buf;
int size;
#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.
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);
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