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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 | /* Define the bit, byte, and word ordering of the machine. */ |
48 | #define TARGET_BYTE_ORDER BIG_ENDIAN | |
fa4b55a1 | 49 | #undef TARGET_INT_BIT |
0a8f9d31 | 50 | #define TARGET_INT_BIT 16 |
96743d3c SC |
51 | #undef TARGET_PTR_BIT |
52 | #define TARGET_PTR_BIT 16 | |
0a8f9d31 SC |
53 | |
54 | ||
55 | /* Offset from address of function to start of its code. | |
56 | Zero on most machines. */ | |
57 | ||
58 | #define FUNCTION_START_OFFSET 0 | |
59 | ||
60 | /* Advance PC across any function entry prologue instructions | |
61 | to reach some "real" code. */ | |
62 | ||
63 | ||
64 | #define SKIP_PROLOGUE(ip) {(ip) = h8300_skip_prologue(ip);} | |
65 | extern CORE_ADDR h8300_skip_prologue (); | |
66 | ||
67 | ||
68 | /* Immediately after a function call, return the saved pc. | |
69 | Can't always go through the frames for this because on some machines | |
70 | the new frame is not set up until the new function executes | |
71 | some instructions. */ | |
72 | ||
73 | #define SAVED_PC_AFTER_CALL(frame) \ | |
1f46923f | 74 | UNSIGNED_SHORT(read_memory_integer (read_register (SP_REGNUM), 2)) |
0a8f9d31 SC |
75 | |
76 | /* Stack grows downward. */ | |
77 | ||
78 | #define INNER_THAN < | |
79 | ||
80 | /* Sequence of bytes for breakpoint instruction. | |
81 | This is a TRAP instruction. The last 4 bits (0xf below) is the | |
82 | vector. Systems which don't use 0xf should define BPT_VECTOR | |
83 | themselves before including this file. */ | |
84 | ||
85 | ||
86 | #define BPT_VECTOR 0xf | |
87 | ||
88 | ||
89 | ||
90 | #define BREAKPOINT {0x4e, (0x40 | BPT_VECTOR)} | |
91 | ||
92 | ||
93 | /* If your kernel resets the pc after the trap happens you may need to | |
94 | define this before including this file. */ | |
95 | ||
96 | ||
1f46923f | 97 | #define DECR_PC_AFTER_BREAK 0 |
0a8f9d31 SC |
98 | |
99 | ||
100 | /* Nonzero if instruction at PC is a return instruction. */ | |
101 | /* Allow any of the return instructions, including a trapv and a return | |
102 | from interupt. */ | |
103 | ||
104 | #define ABOUT_TO_RETURN(pc) ((read_memory_integer (pc, 2) & ~0x3) == 0x4e74) | |
105 | ||
106 | /* Return 1 if P points to an invalid floating point value. */ | |
107 | ||
108 | #define INVALID_FLOAT(p, len) 0 /* Just a first guess; not checked */ | |
109 | ||
110 | /* Say how long registers are. */ | |
111 | ||
fa4b55a1 | 112 | #define REGISTER_TYPE unsigned short |
0a8f9d31 SC |
113 | |
114 | # define NUM_REGS 10 | |
115 | # define REGISTER_BYTES (10*2) | |
116 | ||
117 | ||
118 | /* Index within `registers' of the first byte of the space for | |
119 | register N. */ | |
120 | ||
121 | #define REGISTER_BYTE(N) ((N) * 2) | |
122 | ||
123 | /* Number of bytes of storage in the actual machine representation | |
124 | for register N. On the H8/300, all regs are 2 bytes. */ | |
125 | ||
126 | #define REGISTER_RAW_SIZE(N) 2 | |
127 | ||
128 | /* Number of bytes of storage in the program's representation | |
129 | for register N. On the H8/300, all regs are 2 bytes. */ | |
130 | ||
131 | #define REGISTER_VIRTUAL_SIZE(N) 2 | |
132 | ||
133 | /* Largest value REGISTER_RAW_SIZE can have. */ | |
134 | ||
135 | #define MAX_REGISTER_RAW_SIZE 2 | |
136 | ||
137 | /* Largest value REGISTER_VIRTUAL_SIZE can have. */ | |
138 | ||
139 | #define MAX_REGISTER_VIRTUAL_SIZE 2 | |
140 | ||
141 | /* Nonzero if register N requires conversion | |
142 | from raw format to virtual format. */ | |
143 | ||
fa4b55a1 | 144 | #define REGISTER_CONVERTIBLE(N) 1 |
0a8f9d31 SC |
145 | |
146 | /* Convert data from raw format for register REGNUM | |
147 | to virtual format for register REGNUM. */ | |
148 | ||
fa4b55a1 | 149 | /*#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) */ |
0a8f9d31 SC |
150 | |
151 | /* Convert data from virtual format for register REGNUM | |
152 | to raw format for register REGNUM. */ | |
153 | ||
fa4b55a1 | 154 | /*#define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) */ |
0a8f9d31 SC |
155 | |
156 | /* Return the GDB type object for the "standard" data type | |
157 | of data in register N. */ | |
158 | ||
fa4b55a1 | 159 | #define REGISTER_VIRTUAL_TYPE(N) builtin_type_unsigned_short |
0a8f9d31 SC |
160 | |
161 | ||
162 | /* Initializer for an array of names of registers. | |
163 | Entries beyond the first NUM_REGS are ignored. */ | |
164 | ||
165 | #define REGISTER_NAMES \ | |
166 | {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "sp","ccr","pc"} | |
167 | ||
168 | ||
169 | /* Register numbers of various important registers. | |
170 | Note that some of these values are "real" register numbers, | |
171 | and correspond to the general registers of the machine, | |
172 | and some are "phony" register numbers which are too large | |
173 | to be actual register numbers as far as the user is concerned | |
174 | but do serve to get the desired values when passed to read_register. */ | |
175 | ||
176 | ||
177 | #define FP_REGNUM 6 /* Contains address of executing stack frame */ | |
178 | #define SP_REGNUM 7 /* Contains address of top of stack */ | |
179 | #define CCR_REGNUM 8 /* Contains processor status */ | |
180 | #define PC_REGNUM 9 /* Contains program counter */ | |
181 | ||
182 | /* Store the address of the place in which to copy the structure the | |
183 | subroutine will return. This is called from call_function. */ | |
184 | ||
1f46923f SC |
185 | /*#define STORE_STRUCT_RETURN(ADDR, SP) \ |
186 | { write_register (0, (ADDR)); abort(); }*/ | |
0a8f9d31 SC |
187 | |
188 | /* Extract from an array REGBUF containing the (raw) register state | |
189 | a function return value of type TYPE, and copy that, in virtual format, | |
1f46923f | 190 | into VALBUF. */ |
0a8f9d31 SC |
191 | |
192 | #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ | |
1f46923f | 193 | bcopy ((char *)(REGBUF), VALBUF, TYPE_LENGTH(TYPE)) |
0a8f9d31 SC |
194 | |
195 | ||
196 | /* Write into appropriate registers a function return value | |
197 | of type TYPE, given in virtual format. Assumes floats are passed | |
198 | in d0/d1. */ | |
199 | ||
200 | ||
201 | #define STORE_RETURN_VALUE(TYPE,VALBUF) \ | |
202 | write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE)) | |
203 | ||
204 | ||
205 | /* Extract from an array REGBUF containing the (raw) register state | |
206 | the address in which a function should return its structure value, | |
207 | as a CORE_ADDR (or an expression that can be used as one). */ | |
208 | ||
209 | #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF)) | |
210 | \f | |
211 | /* Describe the pointer in each stack frame to the previous stack frame | |
212 | (its caller). */ | |
213 | ||
214 | /* FRAME_CHAIN takes a frame's nominal address | |
215 | and produces the frame's chain-pointer. | |
216 | ||
217 | However, if FRAME_CHAIN_VALID returns zero, | |
218 | it means the given frame is the outermost one and has no caller. */ | |
219 | ||
220 | /* In the case of the H8/300, the frame's nominal address | |
221 | is the address of a 2-byte word containing the calling frame's address. */ | |
222 | ||
223 | ||
224 | ||
225 | ||
226 | /* Use the alternate method of avoiding running up off the end of | |
227 | the frame chain or following frames back into the startup code. | |
228 | See the comments in blockframe.c */ | |
229 | ||
230 | #define FRAME_CHAIN_VALID(chain, thisframe) \ | |
231 | (chain != 0 \ | |
232 | && !(inside_main_scope ((thisframe)->pc)) \ | |
233 | && !(inside_entry_scope ((thisframe)->pc))) | |
234 | ||
235 | ||
236 | /* Define other aspects of the stack frame. */ | |
237 | ||
238 | /* A macro that tells us whether the function invocation represented | |
239 | by FI does not have a frame on the stack associated with it. If it | |
240 | does not, FRAMELESS is set to 1, else 0. */ | |
241 | #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \ | |
242 | (FRAMELESS) = frameless_look_for_prologue(FI) | |
243 | ||
1f46923f SC |
244 | /* Any function with a frame looks like this |
245 | SECOND ARG | |
246 | FIRST ARG | |
247 | RET PC | |
248 | SAVED R2 | |
249 | SAVED R3 | |
250 | SAVED FP <-FP POINTS HERE | |
251 | LOCALS0 | |
252 | LOCALS1 <-SP POINTS HERE | |
253 | ||
254 | */ | |
255 | #define FRAME_SAVED_PC(FRAME) frame_saved_pc(FRAME) | |
0a8f9d31 | 256 | |
1f46923f | 257 | #define FRAME_ARGS_ADDRESS(fi) frame_args_address(fi) |
0a8f9d31 | 258 | |
1f46923f | 259 | #define FRAME_LOCALS_ADDRESS(fi) frame_locals_address(fi); |
0a8f9d31 SC |
260 | |
261 | /* Set VAL to the number of args passed to frame described by FI. | |
262 | Can set VAL to -1, meaning no way to tell. */ | |
263 | ||
264 | /* We can't tell how many args there are | |
265 | now that the C compiler delays popping them. */ | |
266 | ||
267 | #define FRAME_NUM_ARGS(val,fi) (val = -1) | |
268 | ||
269 | ||
270 | /* Return number of bytes at start of arglist that are not really args. */ | |
271 | ||
1f46923f | 272 | #define FRAME_ARGS_SKIP 0 |
0a8f9d31 SC |
273 | |
274 | /* Put here the code to store, into a struct frame_saved_regs, | |
275 | the addresses of the saved registers of frame described by FRAME_INFO. | |
276 | This includes special registers such as pc and fp saved in special | |
277 | ways in the stack frame. sp is even more special: | |
278 | the address we return for it IS the sp for the next frame. */ | |
279 | ||
1f46923f SC |
280 | #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \ |
281 | frame_find_saved_regs(frame_info, &(frame_saved_regs)) | |
0a8f9d31 SC |
282 | \f |
283 | ||
284 | /* Push an empty stack frame, to record the current PC, etc. */ | |
285 | ||
1f46923f | 286 | /*#define PUSH_DUMMY_FRAME { h8300_push_dummy_frame (); }*/ |
0a8f9d31 SC |
287 | |
288 | /* Discard from the stack the innermost frame, restoring all registers. */ | |
289 | ||
290 | #define POP_FRAME { h8300_pop_frame (); } | |
291 | ||
fa4b55a1 SC |
292 | #define SHORT_INT_MAX 32767 |
293 | #define SHORT_INT_MIN -32768 | |
294 | ||
400943fb | 295 | |
fa4b55a1 SC |
296 | #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \ |
297 | { bcopy ((FROM), (TO), 2); } | |
298 | #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \ | |
299 | { bcopy ((FROM), (TO), 4); } | |
1f46923f SC |
300 | |
301 | #define BEFORE_MAIN_LOOP_HOOK \ | |
302 | hms_before_main_loop(); | |
303 | ||
304 | ||
305 | #define NAMES_HAVE_UNDERSCORE | |
306 | ||
307 | typedef unsigned short INSN_WORD; | |
96743d3c SC |
308 | |
309 | #define ADDR_BITS_REMOVE(addr) ((addr) & 0xffff) | |
310 | #define ADDR_BITS_SET(addr) (((addr))) | |
311 | ||
312 | #define read_memory_short(x) (read_memory_integer(x,2) & 0xffff) |