+ get_frame_saved_regs (fi, &ignore);
+
+ }
+
+ return fi->args_pointer;
+}
+
+/* Function: push_arguments
+ Setup the function arguments for calling a function in the inferior.
+
+ On the Hitachi H8/300 architecture, there are three registers (R0 to R2)
+ which are dedicated for passing function arguments. Up to the first
+ three arguments (depending on size) may go into these registers.
+ The rest go on the stack.
+
+ Arguments that are smaller than WORDSIZE bytes will still take up a
+ whole register or a whole WORDSIZE word on the stack, and will be
+ right-justified in the register or the stack word. This includes
+ chars and small aggregate types. Note that WORDSIZE depends on the
+ cpu type.
+
+ Arguments that are larger than WORDSIZE bytes will be split between
+ two or more registers as available, but will NOT be split between a
+ register and the stack.
+
+ An exceptional case exists for struct arguments (and possibly other
+ aggregates such as arrays) -- if the size is larger than WORDSIZE
+ bytes but not a multiple of WORDSIZE bytes. In this case the
+ argument is never split between the registers and the stack, but
+ instead is copied in its entirety onto the stack, AND also copied
+ into as many registers as there is room for. In other words, space
+ in registers permitting, two copies of the same argument are passed
+ in. As far as I can tell, only the one on the stack is used,
+ although that may be a function of the level of compiler
+ optimization. I suspect this is a compiler bug. Arguments of
+ these odd sizes are left-justified within the word (as opposed to
+ arguments smaller than WORDSIZE bytes, which are right-justified).
+
+ If the function is to return an aggregate type such as a struct,
+ the caller must allocate space into which the callee will copy the
+ return value. In this case, a pointer to the return value location
+ is passed into the callee in register R0, which displaces one of
+ the other arguments passed in via registers R0 to R2. */
+
+CORE_ADDR
+h8300_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
+ unsigned char struct_return, CORE_ADDR struct_addr)
+{
+ int stack_align, stack_alloc, stack_offset;
+ int wordsize;
+ int argreg;
+ int argnum;
+ struct type *type;
+ CORE_ADDR regval;
+ char *val;
+ char valbuf[4];
+ int len;
+
+ if (h8300hmode || h8300smode)
+ {
+ stack_align = 3;
+ wordsize = 4;
+ }
+ else
+ {
+ stack_align = 1;
+ wordsize = 2;
+ }
+
+ /* first force sp to a n-byte alignment */
+ sp = sp & ~stack_align;
+
+ /* Now make sure there's space on the stack */
+ for (argnum = 0, stack_alloc = 0;
+ argnum < nargs; argnum++)
+ stack_alloc += ((TYPE_LENGTH (VALUE_TYPE (args[argnum])) + stack_align)
+ & ~stack_align);
+ sp -= stack_alloc; /* make room on stack for args */
+ /* we may over-allocate a little here, but that won't hurt anything */
+
+ argreg = ARG0_REGNUM;
+ if (struct_return) /* "struct return" pointer takes up one argreg */
+ {
+ write_register (argreg++, struct_addr);
+ }
+
+ /* Now load as many as possible of the first arguments into
+ registers, and push the rest onto the stack. There are 3N bytes
+ in three registers available. Loop thru args from first to last. */
+
+ for (argnum = 0, stack_offset = 0; argnum < nargs; argnum++)
+ {
+ type = VALUE_TYPE (args[argnum]);
+ len = TYPE_LENGTH (type);
+ memset (valbuf, 0, sizeof (valbuf));
+ if (len < wordsize)
+ {
+ /* the purpose of this is to right-justify the value within the word */
+ memcpy (valbuf + (wordsize - len),
+ (char *) VALUE_CONTENTS (args[argnum]), len);
+ val = valbuf;
+ }
+ else
+ val = (char *) VALUE_CONTENTS (args[argnum]);
+
+ if (len > (ARGLAST_REGNUM + 1 - argreg) * REGISTER_RAW_SIZE (ARG0_REGNUM) ||
+ (len > wordsize && (len & stack_align) != 0))
+ { /* passed on the stack */
+ write_memory (sp + stack_offset, val,
+ len < wordsize ? wordsize : len);
+ stack_offset += (len + stack_align) & ~stack_align;
+ }
+ /* NOTE WELL!!!!! This is not an "else if" clause!!!
+ That's because some *&^%$ things get passed on the stack
+ AND in the registers! */
+ if (len <= (ARGLAST_REGNUM + 1 - argreg) * REGISTER_RAW_SIZE (ARG0_REGNUM))
+ while (len > 0)
+ { /* there's room in registers */
+ regval = extract_address (val, wordsize);
+ write_register (argreg, regval);
+ len -= wordsize;
+ val += wordsize;
+ argreg++;
+ }
+ }
+ return sp;
+}
+
+/* Function: push_return_address
+ Setup the return address for a dummy frame, as called by
+ call_function_by_hand. Only necessary when you are using an
+ empty CALL_DUMMY, ie. the target will not actually be executing
+ a JSR/BSR instruction. */
+
+CORE_ADDR
+h8300_push_return_address (CORE_ADDR pc, CORE_ADDR sp)
+{
+ unsigned char buf[4];
+ int wordsize;
+
+ if (h8300hmode || h8300smode)
+ wordsize = 4;
+ else
+ wordsize = 2;
+
+ sp -= wordsize;
+ store_unsigned_integer (buf, wordsize, CALL_DUMMY_ADDRESS ());
+ write_memory (sp, buf, wordsize);
+ return sp;
+}
+
+/* Function: h8300_pop_frame
+ Restore the machine to the state it had before the current frame
+ was created. Usually used either by the "RETURN" command, or by
+ call_function_by_hand after the dummy_frame is finished. */
+
+void
+h8300_pop_frame (void)
+{
+ unsigned regnum;
+ struct frame_saved_regs fsr;
+ struct frame_info *frame = get_current_frame ();
+
+ if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame))
+ {
+ generic_pop_dummy_frame ();
+ }
+ else
+ {
+ get_frame_saved_regs (frame, &fsr);
+
+ for (regnum = 0; regnum < 8; regnum++)
+ {
+ /* Don't forget SP_REGNUM is a frame_saved_regs struct is the
+ actual value we want, not the address of the value we want. */
+ if (fsr.regs[regnum] && regnum != SP_REGNUM)
+ write_register (regnum,
+ read_memory_integer (fsr.regs[regnum], BINWORD));
+ else if (fsr.regs[regnum] && regnum == SP_REGNUM)
+ write_register (regnum, frame->frame + 2 * BINWORD);
+ }
+
+ /* Don't forget the update the PC too! */
+ write_pc (frame->from_pc);
+ }
+ flush_cached_frames ();
+}
+
+/* Function: extract_return_value
+ Figure out where in REGBUF the called function has left its return value.
+ Copy that into VALBUF. Be sure to account for CPU type. */
+
+void
+h8300_extract_return_value (struct type *type, char *regbuf, char *valbuf)
+{
+ int wordsize, len;
+
+ if (h8300smode || h8300hmode)
+ wordsize = 4;
+ else
+ wordsize = 2;
+
+ len = TYPE_LENGTH (type);
+
+ switch (len)
+ {
+ case 1: /* (char) */
+ case 2: /* (short), (int) */
+ memcpy (valbuf, regbuf + REGISTER_BYTE (0) + (wordsize - len), len);
+ break;
+ case 4: /* (long), (float) */
+ if (h8300smode || h8300hmode)
+ {
+ memcpy (valbuf, regbuf + REGISTER_BYTE (0), 4);
+ }
+ else
+ {
+ memcpy (valbuf, regbuf + REGISTER_BYTE (0), 2);
+ memcpy (valbuf + 2, regbuf + REGISTER_BYTE (1), 2);
+ }
+ break;
+ case 8: /* (double) (doesn't seem to happen, which is good,
+ because this almost certainly isn't right. */
+ error ("I don't know how a double is returned.");
+ break;
+ }
+}
+
+/* Function: store_return_value
+ Place the appropriate value in the appropriate registers.
+ Primarily used by the RETURN command. */
+
+void
+h8300_store_return_value (struct type *type, char *valbuf)
+{
+ int wordsize, len, regval;
+
+ if (h8300hmode || h8300smode)
+ wordsize = 4;
+ else
+ wordsize = 2;
+
+ len = TYPE_LENGTH (type);
+ switch (len)
+ {
+ case 1: /* char */
+ case 2: /* short, int */
+ regval = extract_address (valbuf, len);
+ write_register (0, regval);
+ break;
+ case 4: /* long, float */
+ regval = extract_address (valbuf, len);
+ if (h8300smode || h8300hmode)
+ {
+ write_register (0, regval);
+ }
+ else
+ {
+ write_register (0, regval >> 16);
+ write_register (1, regval & 0xffff);
+ }
+ break;
+ case 8: /* presumeably double, but doesn't seem to happen */
+ error ("I don't know how to return a double.");
+ break;
+ }
+}
+
+struct cmd_list_element *setmemorylist;
+
+static void
+set_register_names (void)
+{
+ if (h8300hmode != 0)
+ h8300_register_names = h8300h_register_names;
+ else
+ h8300_register_names = original_register_names;
+}
+
+static void
+h8300_command (char *args, int from_tty)
+{
+ extern int h8300hmode;
+ h8300hmode = 0;
+ h8300smode = 0;
+ set_register_names ();
+}
+
+static void
+h8300h_command (char *args, int from_tty)
+{
+ extern int h8300hmode;
+ h8300hmode = 1;
+ h8300smode = 0;
+ set_register_names ();
+}
+
+static void
+h8300s_command (char *args, int from_tty)
+{
+ extern int h8300smode;
+ extern int h8300hmode;
+ h8300smode = 1;
+ h8300hmode = 1;
+ set_register_names ();
+}
+
+
+static void
+set_machine (char *args, int from_tty)
+{
+ printf_unfiltered ("\"set machine\" must be followed by h8300, h8300h");
+ printf_unfiltered ("or h8300s");
+ help_list (setmemorylist, "set memory ", -1, gdb_stdout);
+}
+
+/* set_machine_hook is called as the exec file is being opened, but
+ before the symbol file is opened. This allows us to set the
+ h8300hmode flag based on the machine type specified in the exec
+ file. This in turn will cause subsequently defined pointer types
+ to be 16 or 32 bits as appropriate for the machine. */
+
+static void
+set_machine_hook (char *filename)
+{
+ if (bfd_get_mach (exec_bfd) == bfd_mach_h8300s)
+ {
+ h8300smode = 1;
+ h8300hmode = 1;
+ }
+ else if (bfd_get_mach (exec_bfd) == bfd_mach_h8300h)
+ {
+ h8300smode = 0;
+ h8300hmode = 1;
+ }
+ else
+ {
+ h8300smode = 0;
+ h8300hmode = 0;
+ }
+ set_register_names ();
+}
+
+void
+_initialize_h8300m (void)
+{
+ add_prefix_cmd ("machine", no_class, set_machine,
+ "set the machine type",
+ &setmemorylist, "set machine ", 0,
+ &setlist);
+
+ add_cmd ("h8300", class_support, h8300_command,
+ "Set machine to be H8/300.", &setmemorylist);
+
+ add_cmd ("h8300h", class_support, h8300h_command,
+ "Set machine to be H8/300H.", &setmemorylist);
+
+ add_cmd ("h8300s", class_support, h8300s_command,
+ "Set machine to be H8/300S.", &setmemorylist);
+
+ /* Add a hook to set the machine type when we're loading a file. */
+
+ specify_exec_file_hook (set_machine_hook);
+}
+
+
+
+void
+h8300_print_register_hook (int regno)
+{
+ if (regno == 8)
+ {
+ /* CCR register */
+ int C, Z, N, V;
+ unsigned char b[4];
+ unsigned char l;
+ read_relative_register_raw_bytes (regno, b);
+ l = b[REGISTER_VIRTUAL_SIZE (8) - 1];
+ printf_unfiltered ("\t");
+ printf_unfiltered ("I-%d - ", (l & 0x80) != 0);
+ printf_unfiltered ("H-%d - ", (l & 0x20) != 0);
+ N = (l & 0x8) != 0;
+ Z = (l & 0x4) != 0;
+ V = (l & 0x2) != 0;
+ C = (l & 0x1) != 0;
+ printf_unfiltered ("N-%d ", N);
+ printf_unfiltered ("Z-%d ", Z);
+ printf_unfiltered ("V-%d ", V);
+ printf_unfiltered ("C-%d ", C);
+ if ((C | Z) == 0)
+ printf_unfiltered ("u> ");
+ if ((C | Z) == 1)
+ printf_unfiltered ("u<= ");
+ if ((C == 0))
+ printf_unfiltered ("u>= ");
+ if (C == 1)
+ printf_unfiltered ("u< ");
+ if (Z == 0)
+ printf_unfiltered ("!= ");
+ if (Z == 1)
+ printf_unfiltered ("== ");
+ if ((N ^ V) == 0)
+ printf_unfiltered (">= ");
+ if ((N ^ V) == 1)
+ printf_unfiltered ("< ");
+ if ((Z | (N ^ V)) == 0)
+ printf_unfiltered ("> ");
+ if ((Z | (N ^ V)) == 1)
+ printf_unfiltered ("<= ");
+ }
+}
+
+void
+_initialize_h8300_tdep (void)
+{
+ tm_print_insn = gdb_print_insn_h8300;
+}