1 /* Parameters for execution on a H8/300 series machine.
2 Copyright 1992, 1993 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
21 /* Contributed by Steve Chamberlain sac@cygnus.com */
24 struct frame_saved_regs
;
28 /* 1 if debugging H8/300H application */
29 extern int h8300hmode
;
30 extern int h8300smode
;
32 /* Number of bytes in a word */
34 #define BINWORD (h8300hmode?4:2)
36 #define EXTRA_FRAME_INFO \
37 struct frame_saved_regs *fsr; \
39 CORE_ADDR args_pointer;\
40 CORE_ADDR locals_pointer ;
42 /* Zero the frame_saved_regs pointer when the frame is initialized,
43 so that FRAME_FIND_SAVED_REGS () will know to allocate and
44 initialize a frame_saved_regs struct the first time it is called.
45 Set the arg_pointer to -1, which is not valid; 0 and other values
46 indicate real, cached values. */
48 #define INIT_EXTRA_FRAME_INFO(fromleaf, fi) \
49 h8300_init_extra_frame_info (fromleaf, fi)
51 extern void h8300_init_extra_frame_info ();
53 #define IEEE_FLOAT (1)
54 /* Define the bit, byte, and word ordering of the machine. */
55 #define TARGET_BYTE_ORDER BIG_ENDIAN
57 #define TARGET_INT_BIT 16
58 #undef TARGET_LONG_BIT
59 #define TARGET_LONG_BIT 32
61 #define TARGET_PTR_BIT (h8300hmode ? 32:16)
63 /* Offset from address of function to start of its code.
64 Zero on most machines. */
66 #define FUNCTION_START_OFFSET 0
68 /* Advance PC across any function entry prologue instructions
69 to reach some "real" code. */
71 #define SKIP_PROLOGUE(ip) (h8300_skip_prologue(ip))
72 extern CORE_ADDR
h8300_skip_prologue ();
74 /* Immediately after a function call, return the saved pc.
75 Can't always go through the frames for this because on some machines
76 the new frame is not set up until the new function executes
79 #define SAVED_PC_AFTER_CALL(frame) \
80 read_memory_unsigned_integer (read_register (SP_REGNUM), BINWORD)
82 /* Stack grows downward. */
84 #define INNER_THAN(lhs,rhs) ((lhs) < (rhs))
86 /*#define BREAKPOINT {0x7A, 0xFF} */
87 #define BREAKPOINT {0x01, 0x80} /* Sleep */
88 #define REMOTE_BREAKPOINT { 0x57, 0x30} /* trapa #3 */
89 /* If your kernel resets the pc after the trap happens you may need to
90 define this before including this file. */
92 #define DECR_PC_AFTER_BREAK 0
94 /* Say how long registers are. */
96 #define REGISTER_SIZE 4
100 #define REGISTER_BYTES (NUM_REGS * 4)
102 /* Index within `registers' of the first byte of the space for
105 #define REGISTER_BYTE(N) ((N) * 4)
107 /* Number of bytes of storage in the actual machine representation
108 for register N. On the H8/300, all regs are 2 bytes. */
110 #define REGISTER_RAW_SIZE(N) (h8300hmode ? 4 : 2)
112 /* Number of bytes of storage in the program's representation
115 #define REGISTER_VIRTUAL_SIZE(N) (h8300hmode ? 4 : 2)
117 /* Largest value REGISTER_RAW_SIZE can have. */
119 #define MAX_REGISTER_RAW_SIZE 4
121 /* Largest value REGISTER_VIRTUAL_SIZE can have. */
123 #define MAX_REGISTER_VIRTUAL_SIZE 4
125 /* Return the GDB type object for the "standard" data type
126 of data in register N. */
128 #define REGISTER_VIRTUAL_TYPE(N) \
129 (h8300hmode ? builtin_type_unsigned_long : builtin_type_unsigned_short)
131 /* Initializer for an array of names of registers.
132 Entries beyond the first NUM_REGS are ignored. */
134 #define REGISTER_NAMES \
135 {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "sp", "ccr","pc","cycles","tick","inst"}
137 /* An array of names of registers. */
139 extern char **h8300_register_names
;
140 #define REGISTER_NAME(i) h8300_register_names[i]
142 /* Register numbers of various important registers.
143 Note that some of these values are "real" register numbers,
144 and correspond to the general registers of the machine,
145 and some are "phony" register numbers which are too large
146 to be actual register numbers as far as the user is concerned
147 but do serve to get the desired values when passed to read_register. */
149 #define ARG0_REGNUM 0 /* first reg in which an arg may be passed */
150 #define ARGLAST_REGNUM 2 /* last reg in which an arg may be passed */
151 #define FP_REGNUM 6 /* Contain saddress of executing stack frame */
152 #define SP_REGNUM 7 /* Contains address of top of stack */
153 #define CCR_REGNUM 8 /* Contains processor status */
154 #define PC_REGNUM 9 /* Contains program counter */
156 /* Extract from an array REGBUF containing the (raw) register state
157 a function return value of type TYPE, and copy that, in virtual format,
160 /* FIXME: Won't work with both h8/300's. */
162 extern void h8300_extract_return_value (struct type
*, char *, char *);
163 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
164 h8300_extract_return_value (TYPE, (char *)(REGBUF), (char *)(VALBUF))
166 /* Write into appropriate registers a function return value
167 of type TYPE, given in virtual format. Assumes floats are passed
169 /* FIXME: Won't work with both h8/300's. */
171 extern void h8300_store_return_value (struct type
*, char *);
172 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
173 h8300_store_return_value(TYPE, (char *) (VALBUF))
175 /* struct passing and returning stuff */
176 #define STORE_STRUCT_RETURN(STRUCT_ADDR, SP) \
177 write_register (0, STRUCT_ADDR)
179 #define USE_STRUCT_CONVENTION(gcc_p, type) (1)
181 /* Extract from an array REGBUF containing the (raw) register state
182 the address in which a function should return its structure value,
183 as a CORE_ADDR (or an expression that can be used as one). */
185 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \
186 extract_address (REGBUF + REGISTER_BYTE (0), \
187 REGISTER_RAW_SIZE (0))
189 /* Describe the pointer in each stack frame to the previous stack frame
192 /* FRAME_CHAIN takes a frame's nominal address
193 and produces the frame's chain-pointer.
195 However, if FRAME_CHAIN_VALID returns zero,
196 it means the given frame is the outermost one and has no caller. */
198 #define FRAME_CHAIN(FRAME) h8300_frame_chain(FRAME)
199 CORE_ADDR
h8300_frame_chain (struct frame_info
*);
201 /* In the case of the H8/300, the frame's nominal address
202 is the address of a 2-byte word containing the calling frame's address. */
204 /* Use the alternate method of avoiding running up off the end of
205 the frame chain or following frames back into the startup code.
206 See the comments in objfile.h */
208 #define FRAME_CHAIN_VALID(fp,fi) func_frame_chain_valid (fp, fi)
210 /* Define other aspects of the stack frame. */
212 /* A macro that tells us whether the function invocation represented
213 by FI does not have a frame on the stack associated with it. If it
214 does not, FRAMELESS is set to 1, else 0. */
215 #define FRAMELESS_FUNCTION_INVOCATION(FI) \
216 (frameless_look_for_prologue (FI))
218 /* Any function with a frame looks like this
224 SAVED FP <-FP POINTS HERE
226 LOCALS1 <-SP POINTS HERE
229 #define FRAME_SAVED_PC(FRAME) h8300_frame_saved_pc(FRAME)
231 #define FRAME_ARGS_ADDRESS(fi) frame_args_address(fi)
233 #define FRAME_LOCALS_ADDRESS(fi) frame_locals_address(fi);
235 /* Set VAL to the number of args passed to frame described by FI.
236 Can set VAL to -1, meaning no way to tell. */
238 /* We can't tell how many args there are
239 now that the C compiler delays popping them. */
241 #define FRAME_NUM_ARGS(fi) (-1)
243 /* Return number of bytes at start of arglist that are not really args. */
245 #define FRAME_ARGS_SKIP 0
247 /* Put here the code to store, into a struct frame_saved_regs,
248 the addresses of the saved registers of frame described by FRAME_INFO.
249 This includes special registers such as pc and fp saved in special
250 ways in the stack frame. sp is even more special:
251 the address we return for it IS the sp for the next frame. */
253 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
254 h8300_frame_find_saved_regs(frame_info, &(frame_saved_regs))
257 typedef unsigned short INSN_WORD
;
260 #define PRINT_REGISTER_HOOK(regno) print_register_hook(regno)
262 #define GDB_TARGET_IS_H8300
264 #define NUM_REALREGS 10
265 #define NOP { 0x01, 0x80} /* A sleep insn */
267 #define BELIEVE_PCC_PROMOTION 1
273 #define USE_GENERIC_DUMMY_FRAMES 1
274 #define CALL_DUMMY {0}
275 #define CALL_DUMMY_LENGTH (0)
276 #define CALL_DUMMY_ADDRESS() entry_point_address ()
277 #define CALL_DUMMY_LOCATION AT_ENTRY_POINT
278 #define CALL_DUMMY_START_OFFSET (0)
279 #define CALL_DUMMY_BREAKPOINT_OFFSET (0)
281 extern CORE_ADDR
h8300_push_arguments (int nargs
,
284 unsigned char struct_return
,
285 CORE_ADDR struct_addr
);
286 extern CORE_ADDR
h8300_push_return_address (CORE_ADDR
, CORE_ADDR
);
288 #define PC_IN_CALL_DUMMY(PC, SP, FP) generic_pc_in_call_dummy (PC, SP, FP)
289 #define FIX_CALL_DUMMY(DUMMY, START_SP, FUNADDR, NARGS, ARGS, TYPE, GCCP)
290 #define PUSH_ARGUMENTS(NARGS, ARGS, SP, STRUCT_RETURN, STRUCT_ADDR) \
291 (h8300_push_arguments (NARGS, ARGS, SP, STRUCT_RETURN, STRUCT_ADDR))
292 /* Push an empty stack frame, to record the current PC, etc. */
293 #define PUSH_DUMMY_FRAME generic_push_dummy_frame ()
294 /* Discard from the stack the innermost frame, restoring all registers. */
295 #define POP_FRAME h8300_pop_frame ()
296 #define PUSH_RETURN_ADDRESS(PC, SP) h8300_push_return_address (PC, SP)
298 /* override the standard get_saved_register function with
299 one that takes account of generic CALL_DUMMY frames */
300 #define GET_SAVED_REGISTER(raw_buffer, optimized, addrp, frame, regnum, lval) \
301 generic_get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval)
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