return (TYPE_LENGTH (value_type) > 8);
}
+
+
+/* The 64 bit ABI retun value convention.
+
+ Return non-zero if the return-value is stored in a register, return
+ 0 if the return-value is instead stored on the stack (a.k.a.,
+ struct return convention).
+
+ For a return-value stored in a register: when INVAL is non-NULL,
+ copy the buffer to the corresponding register return-value location
+ location; when OUTVAL is non-NULL, fill the buffer from the
+ corresponding register return-value location. */
+
+/* Potential ways that a function can return a value of a given type. */
+enum return_value_convention
+{
+ /* Where the return value has been squeezed into one or more
+ registers. */
+ RETURN_VALUE_REGISTER_CONVENTION,
+ /* Commonly known as the "struct return convention". The caller
+ passes an additional hidden first parameter to the caller. That
+ parameter contains the address at which the value being returned
+ should be stored. While typically, and historically, used for
+ large structs, this is convention is applied to values of many
+ different types. */
+ RETURN_VALUE_STRUCT_CONVENTION
+};
+
+static enum return_value_convention
+ppc64_sysv_abi_return_value (struct type *valtype, struct regcache *regcache,
+ const void *inval, void *outval)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+ /* Floats and doubles in F1. */
+ if (TYPE_CODE (valtype) == TYPE_CODE_FLT
+ && TYPE_LENGTH (valtype) <= 8)
+ {
+ char regval[MAX_REGISTER_SIZE];
+ struct type *regtype = register_type (current_gdbarch, FP0_REGNUM);
+ if (inval != NULL)
+ {
+ convert_typed_floating (inval, valtype, regval, regtype);
+ regcache_cooked_write (regcache, FP0_REGNUM + 1, regval);
+ }
+ if (outval != NULL)
+ {
+ regcache_cooked_read (regcache, FP0_REGNUM + 1, regval);
+ convert_typed_floating (regval, regtype, outval, valtype);
+ }
+ return RETURN_VALUE_REGISTER_CONVENTION;
+ }
+ if (TYPE_CODE (valtype) == TYPE_CODE_INT
+ && TYPE_LENGTH (valtype) <= 8)
+ {
+ /* Integers in r3. */
+ if (inval != NULL)
+ {
+ /* Be careful to sign extend the value. */
+ regcache_cooked_write_unsigned (regcache, tdep->ppc_gp0_regnum + 3,
+ unpack_long (valtype, inval));
+ }
+ if (outval != NULL)
+ {
+ /* Extract the integer from r3. Since this is truncating the
+ value, there isn't a sign extension problem. */
+ ULONGEST regval;
+ regcache_cooked_read_unsigned (regcache, tdep->ppc_gp0_regnum + 3,
+ ®val);
+ store_unsigned_integer (outval, TYPE_LENGTH (valtype), regval);
+ }
+ return RETURN_VALUE_REGISTER_CONVENTION;
+ }
+ /* All pointers live in r3. */
+ if (TYPE_CODE (valtype) == TYPE_CODE_PTR)
+ {
+ /* All pointers live in r3. */
+ if (inval != NULL)
+ regcache_cooked_write (regcache, tdep->ppc_gp0_regnum + 3, inval);
+ if (outval != NULL)
+ regcache_cooked_read (regcache, tdep->ppc_gp0_regnum + 3, outval);
+ return RETURN_VALUE_REGISTER_CONVENTION;
+ }
+ if (TYPE_CODE (valtype) == TYPE_CODE_ARRAY
+ && TYPE_LENGTH (valtype) <= 8
+ && TYPE_CODE (TYPE_TARGET_TYPE (valtype)) == TYPE_CODE_INT
+ && TYPE_LENGTH (TYPE_TARGET_TYPE (valtype)) == 1)
+ {
+ /* Small character arrays are returned, right justified, in r3. */
+ int offset = (register_size (current_gdbarch, tdep->ppc_gp0_regnum + 3)
+ - TYPE_LENGTH (valtype));
+ if (inval != NULL)
+ regcache_cooked_write_part (regcache, tdep->ppc_gp0_regnum + 3,
+ offset, TYPE_LENGTH (valtype), inval);
+ if (outval != NULL)
+ regcache_cooked_read_part (regcache, tdep->ppc_gp0_regnum + 3,
+ offset, TYPE_LENGTH (valtype), outval);
+ return RETURN_VALUE_REGISTER_CONVENTION;
+ }
+ /* Big floating point values get stored in adjacent floating
+ point registers. */
+ if (TYPE_CODE (valtype) == TYPE_CODE_FLT
+ && (TYPE_LENGTH (valtype) == 16
+ || TYPE_LENGTH (valtype) == 32))
+ {
+ if (inval || outval != NULL)
+ {
+ int i;
+ for (i = 0; i < TYPE_LENGTH (valtype) / 8; i++)
+ {
+ if (inval != NULL)
+ regcache_cooked_write (regcache, FP0_REGNUM + 1 + i,
+ (const bfd_byte *) inval + i * 8);
+ if (outval != NULL)
+ regcache_cooked_read (regcache, FP0_REGNUM + 1 + i,
+ (bfd_byte *) outval + i * 8);
+ }
+ }
+ return RETURN_VALUE_REGISTER_CONVENTION;
+ }
+ /* Complex values get returned in f1:f2, need to convert. */
+ if (TYPE_CODE (valtype) == TYPE_CODE_COMPLEX
+ && (TYPE_LENGTH (valtype) == 8 || TYPE_LENGTH (valtype) == 16))
+ {
+ if (regcache != NULL)
+ {
+ int i;
+ for (i = 0; i < 2; i++)
+ {
+ char regval[MAX_REGISTER_SIZE];
+ struct type *regtype = register_type (current_gdbarch, FP0_REGNUM);
+ if (inval != NULL)
+ {
+ convert_typed_floating ((const bfd_byte *) inval + i * (TYPE_LENGTH (valtype) / 2),
+ valtype, regval, regtype);
+ regcache_cooked_write (regcache, FP0_REGNUM + 1 + i, regval);
+ }
+ if (outval != NULL)
+ {
+ regcache_cooked_read (regcache, FP0_REGNUM + 1 + i, regval);
+ convert_typed_floating (regval, regtype,
+ (bfd_byte *) outval + i * (TYPE_LENGTH (valtype) / 2),
+ valtype);
+ }
+ }
+ }
+ return RETURN_VALUE_REGISTER_CONVENTION;
+ }
+ /* Big complex values get stored in f1:f4. */
+ if (TYPE_CODE (valtype) == TYPE_CODE_COMPLEX
+ && TYPE_LENGTH (valtype) == 32)
+ {
+ if (regcache != NULL)
+ {
+ int i;
+ for (i = 0; i < 4; i++)
+ {
+ if (inval != NULL)
+ regcache_cooked_write (regcache, FP0_REGNUM + 1 + i,
+ (const bfd_byte *) inval + i * 8);
+ if (outval != NULL)
+ regcache_cooked_read (regcache, FP0_REGNUM + 1 + i,
+ (bfd_byte *) outval + i * 8);
+ }
+ }
+ return RETURN_VALUE_REGISTER_CONVENTION;
+ }
+ return RETURN_VALUE_STRUCT_CONVENTION;
+}
+
+int
+ppc64_sysv_abi_use_struct_convention (int gcc_p, struct type *value_type)
+{
+ return (ppc64_sysv_abi_return_value (value_type, NULL, NULL, NULL)
+ == RETURN_VALUE_STRUCT_CONVENTION);
+}
+
+void
+ppc64_sysv_abi_extract_return_value (struct type *valtype,
+ struct regcache *regbuf,
+ void *valbuf)
+{
+ if (ppc64_sysv_abi_return_value (valtype, regbuf, NULL, valbuf)
+ != RETURN_VALUE_REGISTER_CONVENTION)
+ error ("Function return value unknown");
+}
+
+void
+ppc64_sysv_abi_store_return_value (struct type *valtype,
+ struct regcache *regbuf,
+ const void *valbuf)
+{
+ if (!ppc64_sysv_abi_return_value (valtype, regbuf, valbuf, NULL))
+ error ("Function return value location unknown");
+}
projects / external / binutils.git / commitdiff