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c906108c SS |
1 | /* Parameters for execution on a H8/300 series machine. |
2 | Copyright 1992, 1993 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
19 | ||
20 | /* Contributed by Steve Chamberlain sac@cygnus.com */ | |
21 | ||
22 | #ifdef __STDC__ | |
23 | struct frame_info; | |
24 | struct frame_saved_regs; | |
25 | struct value; | |
26 | struct type; | |
27 | #endif | |
28 | ||
29 | /* 1 if debugging H8/300H application */ | |
30 | extern int h8300hmode; | |
31 | extern int h8300smode; | |
32 | ||
33 | /* Number of bytes in a word */ | |
34 | ||
35 | #define BINWORD (h8300hmode?4:2) | |
36 | ||
37 | #define EXTRA_FRAME_INFO \ | |
38 | struct frame_saved_regs *fsr; \ | |
39 | CORE_ADDR from_pc; \ | |
40 | CORE_ADDR args_pointer;\ | |
41 | CORE_ADDR locals_pointer ; | |
42 | ||
43 | /* Zero the frame_saved_regs pointer when the frame is initialized, | |
44 | so that FRAME_FIND_SAVED_REGS () will know to allocate and | |
45 | initialize a frame_saved_regs struct the first time it is called. | |
46 | Set the arg_pointer to -1, which is not valid; 0 and other values | |
47 | indicate real, cached values. */ | |
48 | ||
49 | #define INIT_EXTRA_FRAME_INFO(fromleaf, fi) \ | |
50 | h8300_init_extra_frame_info (fromleaf, fi) | |
51 | ||
52 | extern void h8300_init_extra_frame_info (); | |
53 | ||
54 | #define IEEE_FLOAT | |
55 | /* Define the bit, byte, and word ordering of the machine. */ | |
56 | #define TARGET_BYTE_ORDER BIG_ENDIAN | |
57 | #undef TARGET_INT_BIT | |
58 | #define TARGET_INT_BIT 16 | |
59 | #undef TARGET_LONG_BIT | |
60 | #define TARGET_LONG_BIT 32 | |
61 | #undef TARGET_PTR_BIT | |
62 | #define TARGET_PTR_BIT (h8300hmode ? 32:16) | |
63 | ||
64 | /* Offset from address of function to start of its code. | |
65 | Zero on most machines. */ | |
66 | ||
67 | #define FUNCTION_START_OFFSET 0 | |
68 | ||
69 | /* Advance PC across any function entry prologue instructions | |
70 | to reach some "real" code. */ | |
71 | ||
b83266a0 | 72 | #define SKIP_PROLOGUE(ip) (h8300_skip_prologue(ip)) |
c906108c SS |
73 | extern CORE_ADDR h8300_skip_prologue (); |
74 | ||
75 | /* Immediately after a function call, return the saved pc. | |
76 | Can't always go through the frames for this because on some machines | |
77 | the new frame is not set up until the new function executes | |
78 | some instructions. */ | |
79 | ||
80 | #define SAVED_PC_AFTER_CALL(frame) \ | |
81 | read_memory_unsigned_integer (read_register (SP_REGNUM), BINWORD) | |
82 | ||
83 | /* Stack grows downward. */ | |
84 | ||
85 | #define INNER_THAN(lhs,rhs) ((lhs) < (rhs)) | |
86 | ||
87 | /*#define BREAKPOINT {0x7A, 0xFF}*/ | |
88 | #define BREAKPOINT {0x01, 0x80} /* Sleep */ | |
89 | #define REMOTE_BREAKPOINT { 0x57, 0x30} /* trapa #3 */ | |
90 | /* If your kernel resets the pc after the trap happens you may need to | |
91 | define this before including this file. */ | |
92 | ||
93 | #define DECR_PC_AFTER_BREAK 0 | |
94 | ||
95 | /* Say how long registers are. */ | |
96 | ||
97 | #define REGISTER_SIZE 4 | |
98 | ||
99 | #define NUM_REGS 13 | |
100 | ||
101 | #define REGISTER_BYTES (NUM_REGS * 4) | |
102 | ||
103 | /* Index within `registers' of the first byte of the space for | |
104 | register N. */ | |
105 | ||
106 | #define REGISTER_BYTE(N) ((N) * 4) | |
107 | ||
108 | /* Number of bytes of storage in the actual machine representation | |
109 | for register N. On the H8/300, all regs are 2 bytes. */ | |
110 | ||
111 | #define REGISTER_RAW_SIZE(N) (h8300hmode ? 4 : 2) | |
112 | ||
113 | /* Number of bytes of storage in the program's representation | |
114 | for register N. */ | |
115 | ||
116 | #define REGISTER_VIRTUAL_SIZE(N) (h8300hmode ? 4 : 2) | |
117 | ||
118 | /* Largest value REGISTER_RAW_SIZE can have. */ | |
119 | ||
120 | #define MAX_REGISTER_RAW_SIZE 4 | |
121 | ||
122 | /* Largest value REGISTER_VIRTUAL_SIZE can have. */ | |
123 | ||
124 | #define MAX_REGISTER_VIRTUAL_SIZE 4 | |
125 | ||
126 | /* Return the GDB type object for the "standard" data type | |
127 | of data in register N. */ | |
128 | ||
129 | #define REGISTER_VIRTUAL_TYPE(N) \ | |
130 | (h8300hmode ? builtin_type_unsigned_long : builtin_type_unsigned_short) | |
131 | ||
132 | /* Initializer for an array of names of registers. | |
133 | Entries beyond the first NUM_REGS are ignored. */ | |
134 | ||
135 | #define REGISTER_NAMES \ | |
136 | {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "sp", "ccr","pc","cycles","tick","inst"} | |
137 | ||
138 | /* An array of names of registers. */ | |
139 | ||
140 | extern char **h8300_register_names; | |
141 | #define REGISTER_NAME(i) h8300_register_names[i] | |
142 | ||
143 | /* Register numbers of various important registers. | |
144 | Note that some of these values are "real" register numbers, | |
145 | and correspond to the general registers of the machine, | |
146 | and some are "phony" register numbers which are too large | |
147 | to be actual register numbers as far as the user is concerned | |
148 | but do serve to get the desired values when passed to read_register. */ | |
149 | ||
150 | #define ARG0_REGNUM 0 /* first reg in which an arg may be passed */ | |
151 | #define ARGLAST_REGNUM 2 /* last reg in which an arg may be passed */ | |
152 | #define FP_REGNUM 6 /* Contain saddress of executing stack frame */ | |
153 | #define SP_REGNUM 7 /* Contains address of top of stack */ | |
154 | #define CCR_REGNUM 8 /* Contains processor status */ | |
155 | #define PC_REGNUM 9 /* Contains program counter */ | |
156 | ||
157 | /* Extract from an array REGBUF containing the (raw) register state | |
158 | a function return value of type TYPE, and copy that, in virtual format, | |
159 | into VALBUF. */ | |
160 | ||
161 | /* FIXME: Won't work with both h8/300's. */ | |
162 | ||
163 | extern void h8300_extract_return_value PARAMS((struct type *, char *, char *)); | |
164 | #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ | |
165 | h8300_extract_return_value (TYPE, (char *)(REGBUF), (char *)(VALBUF)) | |
166 | ||
167 | /* Write into appropriate registers a function return value | |
168 | of type TYPE, given in virtual format. Assumes floats are passed | |
169 | in d0/d1. */ | |
170 | /* FIXME: Won't work with both h8/300's. */ | |
171 | ||
172 | extern void h8300_store_return_value PARAMS((struct type *, char *)); | |
173 | #define STORE_RETURN_VALUE(TYPE,VALBUF) \ | |
174 | h8300_store_return_value(TYPE, (char *) (VALBUF)) | |
175 | ||
176 | /* struct passing and returning stuff */ | |
177 | #define STORE_STRUCT_RETURN(STRUCT_ADDR, SP) \ | |
178 | write_register (0, STRUCT_ADDR) | |
179 | ||
180 | #define USE_STRUCT_CONVENTION(gcc_p, type) (1) | |
181 | ||
182 | /* Extract from an array REGBUF containing the (raw) register state | |
183 | the address in which a function should return its structure value, | |
184 | as a CORE_ADDR (or an expression that can be used as one). */ | |
185 | ||
186 | #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \ | |
187 | extract_address (REGBUF + REGISTER_BYTE (0), \ | |
188 | REGISTER_RAW_SIZE (0)) | |
189 | ||
190 | /* Describe the pointer in each stack frame to the previous stack frame | |
191 | (its caller). */ | |
192 | ||
193 | /* FRAME_CHAIN takes a frame's nominal address | |
194 | and produces the frame's chain-pointer. | |
195 | ||
196 | However, if FRAME_CHAIN_VALID returns zero, | |
197 | it means the given frame is the outermost one and has no caller. */ | |
198 | ||
199 | #define FRAME_CHAIN(FRAME) h8300_frame_chain(FRAME) | |
200 | CORE_ADDR h8300_frame_chain PARAMS ((struct frame_info *)); | |
201 | ||
202 | /* In the case of the H8/300, the frame's nominal address | |
203 | is the address of a 2-byte word containing the calling frame's address. */ | |
204 | ||
205 | /* Use the alternate method of avoiding running up off the end of | |
206 | the frame chain or following frames back into the startup code. | |
207 | See the comments in objfile.h */ | |
208 | ||
209 | #define FRAME_CHAIN_VALID(fp,fi) alternate_frame_chain_valid (fp, fi) | |
210 | ||
211 | /* Define other aspects of the stack frame. */ | |
212 | ||
213 | /* A macro that tells us whether the function invocation represented | |
214 | by FI does not have a frame on the stack associated with it. If it | |
215 | does not, FRAMELESS is set to 1, else 0. */ | |
216 | #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \ | |
217 | (FRAMELESS) = frameless_look_for_prologue(FI) | |
218 | ||
219 | /* Any function with a frame looks like this | |
220 | SECOND ARG | |
221 | FIRST ARG | |
222 | RET PC | |
223 | SAVED R2 | |
224 | SAVED R3 | |
225 | SAVED FP <-FP POINTS HERE | |
226 | LOCALS0 | |
227 | LOCALS1 <-SP POINTS HERE | |
228 | */ | |
229 | ||
230 | #define FRAME_SAVED_PC(FRAME) h8300_frame_saved_pc(FRAME) | |
231 | ||
232 | #define FRAME_ARGS_ADDRESS(fi) frame_args_address(fi) | |
233 | ||
234 | #define FRAME_LOCALS_ADDRESS(fi) frame_locals_address(fi); | |
235 | ||
236 | /* Set VAL to the number of args passed to frame described by FI. | |
237 | Can set VAL to -1, meaning no way to tell. */ | |
238 | ||
239 | /* We can't tell how many args there are | |
240 | now that the C compiler delays popping them. */ | |
241 | ||
242 | #define FRAME_NUM_ARGS(val,fi) (val = -1) | |
243 | ||
244 | /* Return number of bytes at start of arglist that are not really args. */ | |
245 | ||
246 | #define FRAME_ARGS_SKIP 0 | |
247 | ||
248 | /* Put here the code to store, into a struct frame_saved_regs, | |
249 | the addresses of the saved registers of frame described by FRAME_INFO. | |
250 | This includes special registers such as pc and fp saved in special | |
251 | ways in the stack frame. sp is even more special: | |
252 | the address we return for it IS the sp for the next frame. */ | |
253 | ||
254 | #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \ | |
255 | h8300_frame_find_saved_regs(frame_info, &(frame_saved_regs)) | |
256 | \f | |
257 | ||
258 | typedef unsigned short INSN_WORD; | |
259 | ||
260 | ||
261 | #define PRINT_REGISTER_HOOK(regno) print_register_hook(regno) | |
262 | ||
263 | #define GDB_TARGET_IS_H8300 | |
264 | ||
265 | #define NUM_REALREGS 10 | |
266 | #define NOP { 0x01, 0x80} /* A sleep insn */ | |
267 | ||
268 | #define BELIEVE_PCC_PROMOTION 1 | |
269 | ||
270 | /* | |
271 | * CALL_DUMMY stuff: | |
272 | */ | |
273 | ||
7a292a7a | 274 | #define USE_GENERIC_DUMMY_FRAMES 1 |
c906108c SS |
275 | #define CALL_DUMMY {0} |
276 | #define CALL_DUMMY_LENGTH (0) | |
277 | #define CALL_DUMMY_ADDRESS() entry_point_address () | |
278 | #define CALL_DUMMY_LOCATION AT_ENTRY_POINT | |
279 | #define CALL_DUMMY_START_OFFSET (0) | |
280 | #define CALL_DUMMY_BREAKPOINT_OFFSET (0) | |
281 | ||
282 | extern CORE_ADDR h8300_push_arguments PARAMS ((int nargs, | |
283 | struct value **args, | |
284 | CORE_ADDR sp, | |
285 | unsigned char struct_return, | |
286 | CORE_ADDR struct_addr)); | |
287 | extern CORE_ADDR h8300_push_return_address PARAMS ((CORE_ADDR, CORE_ADDR)); | |
288 | ||
7a292a7a | 289 | #define PC_IN_CALL_DUMMY(PC, SP, FP) generic_pc_in_call_dummy (PC, SP, FP) |
c906108c SS |
290 | #define FIX_CALL_DUMMY(DUMMY, START_SP, FUNADDR, NARGS, ARGS, TYPE, GCCP) |
291 | #define PUSH_ARGUMENTS(NARGS, ARGS, SP, STRUCT_RETURN, STRUCT_ADDR) \ | |
292 | (SP) = h8300_push_arguments (NARGS, ARGS, SP, STRUCT_RETURN, STRUCT_ADDR) | |
293 | /* Push an empty stack frame, to record the current PC, etc. */ | |
294 | #define PUSH_DUMMY_FRAME generic_push_dummy_frame () | |
295 | /* Discard from the stack the innermost frame, restoring all registers. */ | |
296 | #define POP_FRAME h8300_pop_frame () | |
297 | #define PUSH_RETURN_ADDRESS(PC, SP) h8300_push_return_address (PC, SP) | |
298 | ||
299 | /* override the standard get_saved_register function with | |
300 | one that takes account of generic CALL_DUMMY frames */ | |
7a292a7a SS |
301 | #define GET_SAVED_REGISTER(raw_buffer, optimized, addrp, frame, regnum, lval) \ |
302 | generic_get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval) | |
303 | ||
c906108c SS |
304 | |
305 |