static struct value *
value_of_builtin_frame_fp_reg (struct frame_info *frame, const void *baton)
{
struct gdbarch *gdbarch = get_frame_arch (frame);
if (gdbarch_deprecated_fp_regnum (gdbarch) >= 0)
/* NOTE: cagney/2003-04-24: Since the mere presence of "fp" in the
register name table overrides this built-in $fp register, there
is no real reason for this gdbarch_deprecated_fp_regnum trickery here.
An architecture wanting to implement "$fp" as alias for a raw
register can do so by adding "fp" to register name table (mind
you, doing this is probably a dangerous thing). */
return value_of_register (gdbarch_deprecated_fp_regnum (gdbarch),
frame);
else
{
struct type *data_ptr_type = builtin_type (gdbarch)->builtin_data_ptr;
struct value *val = allocate_value (data_ptr_type);
gdb_byte *buf = value_contents_raw (val);
if (frame == NULL)
memset (buf, 0, TYPE_LENGTH (value_type (val)));
else
gdbarch_address_to_pointer (gdbarch, data_ptr_type,
buf, get_frame_base_address (frame));
return val;
}
}
void
legacy_virtual_frame_pointer (struct gdbarch *gdbarch,
CORE_ADDR pc,
int *frame_regnum,
LONGEST *frame_offset)
{
/* FIXME: cagney/2002-09-13: This code is used when identifying the
frame pointer of the current PC. It is assuming that a single
register and an offset can determine this. I think it should
instead generate a byte code expression as that would work better
with things like Dwarf2's CFI. */
if (gdbarch_deprecated_fp_regnum (gdbarch) >= 0
&& gdbarch_deprecated_fp_regnum (gdbarch)
< gdbarch_num_regs (gdbarch))
*frame_regnum = gdbarch_deprecated_fp_regnum (gdbarch);
else if (gdbarch_sp_regnum (gdbarch) >= 0
&& gdbarch_sp_regnum (gdbarch)
< gdbarch_num_regs (gdbarch))
*frame_regnum = gdbarch_sp_regnum (gdbarch);
else
/* Should this be an internal error? I guess so, it is reflecting
an architectural limitation in the current design. */
internal_error (__FILE__, __LINE__,
_("No virtual frame pointer available"));
*frame_offset = 0;
}