struct type *type, struct regcache *regcache,
gdb_byte *readbuf, const gdb_byte *writebuf)
{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ int fp_return_type = 0;
+ int offset, regnum, xfer;
+
if (TYPE_LENGTH (type) > 2 * mips_abi_regsize (gdbarch))
return RETURN_VALUE_STRUCT_CONVENTION;
- if (readbuf)
- memset (readbuf, 0, TYPE_LENGTH (type));
+
+ /* Floating point type? */
+ if (tdep->mips_fpu_type != MIPS_FPU_NONE)
+ {
+ if (TYPE_CODE (type) == TYPE_CODE_FLT)
+ fp_return_type = 1;
+ /* Structs with a single field of float type
+ are returned in a floating point register. */
+ if ((TYPE_CODE (type) == TYPE_CODE_STRUCT
+ || TYPE_CODE (type) == TYPE_CODE_UNION)
+ && TYPE_NFIELDS (type) == 1)
+ {
+ struct type *fieldtype = TYPE_FIELD_TYPE (type, 0);
+
+ if (TYPE_CODE (check_typedef (fieldtype)) == TYPE_CODE_FLT)
+ fp_return_type = 1;
+ }
+ }
+
+ if (fp_return_type)
+ {
+ /* A floating-point value belongs in the least significant part
+ of FP0/FP1. */
+ if (mips_debug)
+ fprintf_unfiltered (gdb_stderr, "Return float in $fp0\n");
+ regnum = mips_regnum (gdbarch)->fp0;
+ }
+ else
+ {
+ /* An integer value goes in V0/V1. */
+ if (mips_debug)
+ fprintf_unfiltered (gdb_stderr, "Return scalar in $v0\n");
+ regnum = MIPS_V0_REGNUM;
+ }
+ for (offset = 0;
+ offset < TYPE_LENGTH (type);
+ offset += mips_abi_regsize (gdbarch), regnum++)
+ {
+ xfer = mips_abi_regsize (gdbarch);
+ if (offset + xfer > TYPE_LENGTH (type))
+ xfer = TYPE_LENGTH (type) - offset;
+ mips_xfer_register (gdbarch, regcache,
+ gdbarch_num_regs (gdbarch) + regnum, xfer,
+ gdbarch_byte_order (gdbarch), readbuf, writebuf,
+ offset);
+ }
+
return RETURN_VALUE_REGISTER_CONVENTION;
}