}
static void
-mn10300_extract_return_value (struct type *type, char *regbuf, char *valbuf)
+mn10300_extract_return_value (struct gdbarch *gdbarch, struct type *type,
+ struct regcache *regcache, void *valbuf)
{
+ char buf[MAX_REGISTER_SIZE];
+ int len = TYPE_LENGTH (type);
+ int reg, regsz;
+
if (TYPE_CODE (type) == TYPE_CODE_PTR)
- memcpy (valbuf, regbuf + DEPRECATED_REGISTER_BYTE (4), TYPE_LENGTH (type));
+ reg = 4;
else
- memcpy (valbuf, regbuf + DEPRECATED_REGISTER_BYTE (0), TYPE_LENGTH (type));
+ reg = 0;
+
+ regsz = register_size (gdbarch, reg);
+ if (len <= regsz)
+ {
+ regcache_raw_read (regcache, reg, buf);
+ memcpy (valbuf, buf, len);
+ }
+ else if (len <= 2 * regsz)
+ {
+ regcache_raw_read (regcache, reg, buf);
+ memcpy (valbuf, buf, regsz);
+ gdb_assert (regsz == register_size (gdbarch, reg + 1));
+ regcache_raw_read (regcache, reg + 1, buf);
+ memcpy ((char *) valbuf + regsz, buf, len - regsz);
+ }
+ else
+ internal_error (__FILE__, __LINE__,
+ "Cannot extract return value %d bytes long.", len);
}
static void
-mn10300_store_return_value (struct type *type, char *valbuf)
+mn10300_store_return_value (struct gdbarch *gdbarch, struct type *type,
+ struct regcache *regcache, const void *valbuf)
{
+ int len = TYPE_LENGTH (type);
+ int reg, regsz;
+
if (TYPE_CODE (type) == TYPE_CODE_PTR)
- deprecated_write_register_bytes (DEPRECATED_REGISTER_BYTE (4), valbuf,
- TYPE_LENGTH (type));
+ reg = 4;
+ else
+ reg = 0;
+
+ regsz = register_size (gdbarch, reg);
+
+ if (len <= regsz)
+ regcache_raw_write_part (regcache, reg, 0, len, valbuf);
+ else if (len <= 2 * regsz)
+ {
+ regcache_raw_write (regcache, reg, valbuf);
+ gdb_assert (regsz == register_size (gdbarch, reg + 1));
+ regcache_raw_write_part (regcache, reg+1, 0,
+ len - regsz, (char *) valbuf + regsz);
+ }
else
- deprecated_write_register_bytes (DEPRECATED_REGISTER_BYTE (0), valbuf,
- TYPE_LENGTH (type));
+ internal_error (__FILE__, __LINE__,
+ "Cannot store return value %d bytes long.", len);
}
static struct frame_info *analyze_dummy_frame (CORE_ADDR, CORE_ADDR);
#define MY_FRAME_IN_FP 0x2
#define NO_MORE_FRAMES 0x4
+/* Compute the alignment required by a type. */
+
+static int
+mn10300_type_align (struct type *type)
+{
+ int i, align = 1;
+
+ switch (TYPE_CODE (type))
+ {
+ case TYPE_CODE_INT:
+ case TYPE_CODE_ENUM:
+ case TYPE_CODE_SET:
+ case TYPE_CODE_RANGE:
+ case TYPE_CODE_CHAR:
+ case TYPE_CODE_BOOL:
+ case TYPE_CODE_FLT:
+ case TYPE_CODE_PTR:
+ case TYPE_CODE_REF:
+ return TYPE_LENGTH (type);
+
+ case TYPE_CODE_COMPLEX:
+ return TYPE_LENGTH (type) / 2;
+
+ case TYPE_CODE_STRUCT:
+ case TYPE_CODE_UNION:
+ for (i = 0; i < TYPE_NFIELDS (type); i++)
+ {
+ int falign = mn10300_type_align (TYPE_FIELD_TYPE (type, i));
+ while (align < falign)
+ align <<= 1;
+ }
+ return align;
+
+ case TYPE_CODE_ARRAY:
+ /* HACK! Structures containing arrays, even small ones, are not
+ elligible for returning in registers. */
+ return 256;
+
+ case TYPE_CODE_TYPEDEF:
+ return mn10300_type_align (check_typedef (type));
+
+ default:
+ abort ();
+ }
+}
/* Should call_function allocate stack space for a struct return? */
static int
-mn10300_use_struct_convention (int gcc_p, struct type *type)
+mn10300_use_struct_convention (struct type *type)
+{
+ /* Structures bigger than a pair of words can't be returned in
+ registers. */
+ if (TYPE_LENGTH (type) > 8)
+ return 1;
+
+ switch (TYPE_CODE (type))
+ {
+ case TYPE_CODE_STRUCT:
+ case TYPE_CODE_UNION:
+ /* Structures with a single field are handled as the field
+ itself. */
+ if (TYPE_NFIELDS (type) == 1)
+ return mn10300_use_struct_convention (TYPE_FIELD_TYPE (type, 0));
+
+ /* Structures with word or double-word size are passed in memory, as
+ long as they require at least word alignment. */
+ if (mn10300_type_align (type) >= 4)
+ return 0;
+
+ return 1;
+
+ /* Arrays are addressable, so they're never returned in
+ registers. This condition can only hold when the array is
+ the only field of a struct or union. */
+ case TYPE_CODE_ARRAY:
+ return 1;
+
+ case TYPE_CODE_TYPEDEF:
+ return mn10300_use_struct_convention (check_typedef (type));
+
+ default:
+ return 0;
+ }
+}
+
+/* Determine, for architecture GDBARCH, how a return value of TYPE
+ should be returned. If it is supposed to be returned in registers,
+ and READBUF is non-zero, read the appropriate value from REGCACHE,
+ and copy it into READBUF. If WRITEBUF is non-zero, write the value
+ from WRITEBUF into REGCACHE. */
+
+static enum return_value_convention
+mn10300_return_value (struct gdbarch *gdbarch, struct type *type,
+ struct regcache *regcache, void *readbuf,
+ const void *writebuf)
{
- return (TYPE_NFIELDS (type) > 1 || TYPE_LENGTH (type) > 8);
+ if (mn10300_use_struct_convention (type))
+ return RETURN_VALUE_STRUCT_CONVENTION;
+
+ if (readbuf)
+ mn10300_extract_return_value (gdbarch, type, regcache, readbuf);
+ if (writebuf)
+ mn10300_store_return_value (gdbarch, type, regcache, writebuf);
+
+ return RETURN_VALUE_REGISTER_CONVENTION;
}
/* The breakpoint instruction must be the same size as the smallest
write_register (regnum, value);
}
- /* Actually cut back the stack. */
- write_register (SP_REGNUM, get_frame_base (frame));
-
- /* Don't we need to set the PC?!? XXX FIXME. */
+ /* Actually cut back the stack, adjusted by the saved registers like
+ ret would. */
+ write_register (SP_REGNUM, get_frame_base (frame) + saved_regs_size (frame));
}
/* Function: pop_frame
set_gdbarch_deprecated_frame_init_saved_regs (gdbarch, mn10300_frame_init_saved_regs);
set_gdbarch_deprecated_frame_chain (gdbarch, mn10300_frame_chain);
set_gdbarch_deprecated_frame_saved_pc (gdbarch, mn10300_frame_saved_pc);
- set_gdbarch_deprecated_extract_return_value (gdbarch, mn10300_extract_return_value);
- set_gdbarch_deprecated_store_return_value (gdbarch, mn10300_store_return_value);
+ set_gdbarch_return_value (gdbarch, mn10300_return_value);
set_gdbarch_deprecated_store_struct_return (gdbarch, mn10300_store_struct_return);
set_gdbarch_deprecated_pop_frame (gdbarch, mn10300_pop_frame);
set_gdbarch_skip_prologue (gdbarch, mn10300_skip_prologue);
set_gdbarch_deprecated_reg_struct_has_addr
(gdbarch, mn10300_reg_struct_has_addr);
set_gdbarch_deprecated_push_return_address (gdbarch, mn10300_push_return_address);
- set_gdbarch_use_struct_convention (gdbarch, mn10300_use_struct_convention);
tdep->am33_mode = am33_mode;
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