Commit | Line | Data |
---|---|---|
0a8f9d31 SC |
1 | /* Parameters for execution on a H8/300 series machine. |
2 | Copyright (C) 1992 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GDB. | |
5 | ||
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. | |
10 | ||
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. | |
15 | ||
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., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
20 | /* Contributed by Steve Chamberlain sac@cygnus.com */ | |
21 | ||
1f46923f SC |
22 | |
23 | #define UNSIGNED_SHORT(X) ((X) & 0xffff) | |
24 | ||
25 | ||
26 | #define EXTRA_FRAME_INFO \ | |
27 | struct frame_saved_regs *fsr; \ | |
28 | CORE_ADDR from_pc; \ | |
29 | CORE_ADDR args_pointer;\ | |
30 | CORE_ADDR locals_pointer ; | |
31 | ||
32 | ||
33 | ||
34 | /* Zero the frame_saved_regs pointer when the frame is initialized, | |
35 | so that FRAME_FIND_SAVED_REGS () will know to allocate and | |
36 | initialize a frame_saved_regs struct the first time it is called. | |
37 | Set the arg_pointer to -1, which is not valid; 0 and other values | |
38 | indicate real, cached values. */ | |
39 | ||
40 | #define INIT_EXTRA_FRAME_INFO(fromleaf, fi) \ | |
41 | init_extra_frame_info (fromleaf, fi) | |
42 | ||
43 | extern void init_extra_frame_info (); | |
44 | ||
45 | ||
46 | #define IEEE_FLOAT | |
0a8f9d31 SC |
47 | |
48 | /* Define the bit, byte, and word ordering of the machine. */ | |
49 | #define TARGET_BYTE_ORDER BIG_ENDIAN | |
fa4b55a1 | 50 | #undef TARGET_INT_BIT |
0a8f9d31 | 51 | #define TARGET_INT_BIT 16 |
0a8f9d31 SC |
52 | |
53 | ||
54 | /* Offset from address of function to start of its code. | |
55 | Zero on most machines. */ | |
56 | ||
57 | #define FUNCTION_START_OFFSET 0 | |
58 | ||
59 | /* Advance PC across any function entry prologue instructions | |
60 | to reach some "real" code. */ | |
61 | ||
62 | ||
63 | #define SKIP_PROLOGUE(ip) {(ip) = h8300_skip_prologue(ip);} | |
64 | extern CORE_ADDR h8300_skip_prologue (); | |
65 | ||
66 | ||
67 | /* Immediately after a function call, return the saved pc. | |
68 | Can't always go through the frames for this because on some machines | |
69 | the new frame is not set up until the new function executes | |
70 | some instructions. */ | |
71 | ||
72 | #define SAVED_PC_AFTER_CALL(frame) \ | |
1f46923f | 73 | UNSIGNED_SHORT(read_memory_integer (read_register (SP_REGNUM), 2)) |
0a8f9d31 SC |
74 | |
75 | /* Stack grows downward. */ | |
76 | ||
77 | #define INNER_THAN < | |
78 | ||
79 | /* Sequence of bytes for breakpoint instruction. | |
80 | This is a TRAP instruction. The last 4 bits (0xf below) is the | |
81 | vector. Systems which don't use 0xf should define BPT_VECTOR | |
82 | themselves before including this file. */ | |
83 | ||
84 | ||
85 | #define BPT_VECTOR 0xf | |
86 | ||
87 | ||
88 | ||
89 | #define BREAKPOINT {0x4e, (0x40 | BPT_VECTOR)} | |
90 | ||
91 | ||
92 | /* If your kernel resets the pc after the trap happens you may need to | |
93 | define this before including this file. */ | |
94 | ||
95 | ||
1f46923f | 96 | #define DECR_PC_AFTER_BREAK 0 |
0a8f9d31 SC |
97 | |
98 | ||
99 | /* Nonzero if instruction at PC is a return instruction. */ | |
100 | /* Allow any of the return instructions, including a trapv and a return | |
101 | from interupt. */ | |
102 | ||
103 | #define ABOUT_TO_RETURN(pc) ((read_memory_integer (pc, 2) & ~0x3) == 0x4e74) | |
104 | ||
105 | /* Return 1 if P points to an invalid floating point value. */ | |
106 | ||
107 | #define INVALID_FLOAT(p, len) 0 /* Just a first guess; not checked */ | |
108 | ||
109 | /* Say how long registers are. */ | |
110 | ||
fa4b55a1 | 111 | #define REGISTER_TYPE unsigned short |
0a8f9d31 SC |
112 | |
113 | # define NUM_REGS 10 | |
114 | # define REGISTER_BYTES (10*2) | |
115 | ||
116 | ||
117 | /* Index within `registers' of the first byte of the space for | |
118 | register N. */ | |
119 | ||
120 | #define REGISTER_BYTE(N) ((N) * 2) | |
121 | ||
122 | /* Number of bytes of storage in the actual machine representation | |
123 | for register N. On the H8/300, all regs are 2 bytes. */ | |
124 | ||
125 | #define REGISTER_RAW_SIZE(N) 2 | |
126 | ||
127 | /* Number of bytes of storage in the program's representation | |
128 | for register N. On the H8/300, all regs are 2 bytes. */ | |
129 | ||
130 | #define REGISTER_VIRTUAL_SIZE(N) 2 | |
131 | ||
132 | /* Largest value REGISTER_RAW_SIZE can have. */ | |
133 | ||
134 | #define MAX_REGISTER_RAW_SIZE 2 | |
135 | ||
136 | /* Largest value REGISTER_VIRTUAL_SIZE can have. */ | |
137 | ||
138 | #define MAX_REGISTER_VIRTUAL_SIZE 2 | |
139 | ||
140 | /* Nonzero if register N requires conversion | |
141 | from raw format to virtual format. */ | |
142 | ||
fa4b55a1 | 143 | #define REGISTER_CONVERTIBLE(N) 1 |
0a8f9d31 SC |
144 | |
145 | /* Convert data from raw format for register REGNUM | |
146 | to virtual format for register REGNUM. */ | |
147 | ||
fa4b55a1 | 148 | /*#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) */ |
0a8f9d31 SC |
149 | |
150 | /* Convert data from virtual format for register REGNUM | |
151 | to raw format for register REGNUM. */ | |
152 | ||
fa4b55a1 | 153 | /*#define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) */ |
0a8f9d31 SC |
154 | |
155 | /* Return the GDB type object for the "standard" data type | |
156 | of data in register N. */ | |
157 | ||
fa4b55a1 | 158 | #define REGISTER_VIRTUAL_TYPE(N) builtin_type_unsigned_short |
0a8f9d31 SC |
159 | |
160 | ||
161 | /* Initializer for an array of names of registers. | |
162 | Entries beyond the first NUM_REGS are ignored. */ | |
163 | ||
164 | #define REGISTER_NAMES \ | |
165 | {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "sp","ccr","pc"} | |
166 | ||
167 | ||
168 | /* Register numbers of various important registers. | |
169 | Note that some of these values are "real" register numbers, | |
170 | and correspond to the general registers of the machine, | |
171 | and some are "phony" register numbers which are too large | |
172 | to be actual register numbers as far as the user is concerned | |
173 | but do serve to get the desired values when passed to read_register. */ | |
174 | ||
175 | ||
176 | #define FP_REGNUM 6 /* Contains address of executing stack frame */ | |
177 | #define SP_REGNUM 7 /* Contains address of top of stack */ | |
178 | #define CCR_REGNUM 8 /* Contains processor status */ | |
179 | #define PC_REGNUM 9 /* Contains program counter */ | |
180 | ||
181 | /* Store the address of the place in which to copy the structure the | |
182 | subroutine will return. This is called from call_function. */ | |
183 | ||
1f46923f SC |
184 | /*#define STORE_STRUCT_RETURN(ADDR, SP) \ |
185 | { write_register (0, (ADDR)); abort(); }*/ | |
0a8f9d31 SC |
186 | |
187 | /* Extract from an array REGBUF containing the (raw) register state | |
188 | a function return value of type TYPE, and copy that, in virtual format, | |
1f46923f | 189 | into VALBUF. */ |
0a8f9d31 SC |
190 | |
191 | #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ | |
1f46923f | 192 | bcopy ((char *)(REGBUF), VALBUF, TYPE_LENGTH(TYPE)) |
0a8f9d31 SC |
193 | |
194 | ||
195 | /* Write into appropriate registers a function return value | |
196 | of type TYPE, given in virtual format. Assumes floats are passed | |
197 | in d0/d1. */ | |
198 | ||
199 | ||
200 | #define STORE_RETURN_VALUE(TYPE,VALBUF) \ | |
201 | write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE)) | |
202 | ||
203 | ||
204 | /* Extract from an array REGBUF containing the (raw) register state | |
205 | the address in which a function should return its structure value, | |
206 | as a CORE_ADDR (or an expression that can be used as one). */ | |
207 | ||
208 | #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF)) | |
209 | \f | |
210 | /* Describe the pointer in each stack frame to the previous stack frame | |
211 | (its caller). */ | |
212 | ||
213 | /* FRAME_CHAIN takes a frame's nominal address | |
214 | and produces the frame's chain-pointer. | |
215 | ||
216 | However, if FRAME_CHAIN_VALID returns zero, | |
217 | it means the given frame is the outermost one and has no caller. */ | |
218 | ||
219 | /* In the case of the H8/300, the frame's nominal address | |
220 | is the address of a 2-byte word containing the calling frame's address. */ | |
221 | ||
222 | ||
223 | ||
224 | ||
225 | /* Use the alternate method of avoiding running up off the end of | |
226 | the frame chain or following frames back into the startup code. | |
227 | See the comments in blockframe.c */ | |
228 | ||
229 | #define FRAME_CHAIN_VALID(chain, thisframe) \ | |
230 | (chain != 0 \ | |
231 | && !(inside_main_scope ((thisframe)->pc)) \ | |
232 | && !(inside_entry_scope ((thisframe)->pc))) | |
233 | ||
234 | ||
235 | /* Define other aspects of the stack frame. */ | |
236 | ||
237 | /* A macro that tells us whether the function invocation represented | |
238 | by FI does not have a frame on the stack associated with it. If it | |
239 | does not, FRAMELESS is set to 1, else 0. */ | |
240 | #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \ | |
241 | (FRAMELESS) = frameless_look_for_prologue(FI) | |
242 | ||
1f46923f SC |
243 | /* Any function with a frame looks like this |
244 | SECOND ARG | |
245 | FIRST ARG | |
246 | RET PC | |
247 | SAVED R2 | |
248 | SAVED R3 | |
249 | SAVED FP <-FP POINTS HERE | |
250 | LOCALS0 | |
251 | LOCALS1 <-SP POINTS HERE | |
252 | ||
253 | */ | |
254 | #define FRAME_SAVED_PC(FRAME) frame_saved_pc(FRAME) | |
0a8f9d31 | 255 | |
1f46923f | 256 | #define FRAME_ARGS_ADDRESS(fi) frame_args_address(fi) |
0a8f9d31 | 257 | |
1f46923f | 258 | #define FRAME_LOCALS_ADDRESS(fi) frame_locals_address(fi); |
0a8f9d31 SC |
259 | |
260 | /* Set VAL to the number of args passed to frame described by FI. | |
261 | Can set VAL to -1, meaning no way to tell. */ | |
262 | ||
263 | /* We can't tell how many args there are | |
264 | now that the C compiler delays popping them. */ | |
265 | ||
266 | #define FRAME_NUM_ARGS(val,fi) (val = -1) | |
267 | ||
268 | ||
269 | /* Return number of bytes at start of arglist that are not really args. */ | |
270 | ||
1f46923f | 271 | #define FRAME_ARGS_SKIP 0 |
0a8f9d31 SC |
272 | |
273 | /* Put here the code to store, into a struct frame_saved_regs, | |
274 | the addresses of the saved registers of frame described by FRAME_INFO. | |
275 | This includes special registers such as pc and fp saved in special | |
276 | ways in the stack frame. sp is even more special: | |
277 | the address we return for it IS the sp for the next frame. */ | |
278 | ||
1f46923f SC |
279 | #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \ |
280 | frame_find_saved_regs(frame_info, &(frame_saved_regs)) | |
0a8f9d31 SC |
281 | \f |
282 | ||
283 | /* Push an empty stack frame, to record the current PC, etc. */ | |
284 | ||
1f46923f | 285 | /*#define PUSH_DUMMY_FRAME { h8300_push_dummy_frame (); }*/ |
0a8f9d31 SC |
286 | |
287 | /* Discard from the stack the innermost frame, restoring all registers. */ | |
288 | ||
289 | #define POP_FRAME { h8300_pop_frame (); } | |
290 | ||
fa4b55a1 SC |
291 | #define SHORT_INT_MAX 32767 |
292 | #define SHORT_INT_MIN -32768 | |
293 | ||
400943fb | 294 | |
fa4b55a1 SC |
295 | #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \ |
296 | { bcopy ((FROM), (TO), 2); } | |
297 | #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \ | |
298 | { bcopy ((FROM), (TO), 4); } | |
1f46923f SC |
299 | |
300 | #define BEFORE_MAIN_LOOP_HOOK \ | |
301 | hms_before_main_loop(); | |
302 | ||
303 | ||
304 | #define NAMES_HAVE_UNDERSCORE | |
305 | ||
306 | typedef unsigned short INSN_WORD; |