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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 | ||
c5aa993b | 4 | This file is part of GDB. |
c906108c | 5 | |
c5aa993b JM |
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. | |
c906108c | 10 | |
c5aa993b JM |
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. | |
c906108c | 15 | |
c5aa993b JM |
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. */ | |
c906108c SS |
20 | |
21 | /* Contributed by Steve Chamberlain sac@cygnus.com */ | |
22 | ||
c906108c SS |
23 | struct frame_info; |
24 | struct frame_saved_regs; | |
25 | struct value; | |
26 | struct type; | |
c906108c SS |
27 | |
28 | /* 1 if debugging H8/300H application */ | |
29 | extern int h8300hmode; | |
30 | extern int h8300smode; | |
31 | ||
32 | /* Number of bytes in a word */ | |
33 | ||
34 | #define BINWORD (h8300hmode?4:2) | |
35 | ||
36 | #define EXTRA_FRAME_INFO \ | |
37 | struct frame_saved_regs *fsr; \ | |
38 | CORE_ADDR from_pc; \ | |
39 | CORE_ADDR args_pointer;\ | |
40 | CORE_ADDR locals_pointer ; | |
41 | ||
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. */ | |
47 | ||
48 | #define INIT_EXTRA_FRAME_INFO(fromleaf, fi) \ | |
49 | h8300_init_extra_frame_info (fromleaf, fi) | |
50 | ||
51 | extern void h8300_init_extra_frame_info (); | |
52 | ||
7355ddba | 53 | #define IEEE_FLOAT (1) |
c906108c SS |
54 | /* Define the bit, byte, and word ordering of the machine. */ |
55 | #define TARGET_BYTE_ORDER BIG_ENDIAN | |
56 | #undef TARGET_INT_BIT | |
57 | #define TARGET_INT_BIT 16 | |
58 | #undef TARGET_LONG_BIT | |
59 | #define TARGET_LONG_BIT 32 | |
60 | #undef TARGET_PTR_BIT | |
61 | #define TARGET_PTR_BIT (h8300hmode ? 32:16) | |
62 | ||
63 | /* Offset from address of function to start of its code. | |
64 | Zero on most machines. */ | |
65 | ||
66 | #define FUNCTION_START_OFFSET 0 | |
67 | ||
68 | /* Advance PC across any function entry prologue instructions | |
69 | to reach some "real" code. */ | |
70 | ||
b83266a0 | 71 | #define SKIP_PROLOGUE(ip) (h8300_skip_prologue(ip)) |
c906108c SS |
72 | extern CORE_ADDR h8300_skip_prologue (); |
73 | ||
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 | |
77 | some instructions. */ | |
78 | ||
79 | #define SAVED_PC_AFTER_CALL(frame) \ | |
80 | read_memory_unsigned_integer (read_register (SP_REGNUM), BINWORD) | |
81 | ||
82 | /* Stack grows downward. */ | |
83 | ||
84 | #define INNER_THAN(lhs,rhs) ((lhs) < (rhs)) | |
85 | ||
c5aa993b JM |
86 | /*#define BREAKPOINT {0x7A, 0xFF} */ |
87 | #define BREAKPOINT {0x01, 0x80} /* Sleep */ | |
88 | #define REMOTE_BREAKPOINT { 0x57, 0x30} /* trapa #3 */ | |
c906108c SS |
89 | /* If your kernel resets the pc after the trap happens you may need to |
90 | define this before including this file. */ | |
91 | ||
92 | #define DECR_PC_AFTER_BREAK 0 | |
93 | ||
94 | /* Say how long registers are. */ | |
95 | ||
96 | #define REGISTER_SIZE 4 | |
97 | ||
c5aa993b | 98 | #define NUM_REGS 13 |
c906108c SS |
99 | |
100 | #define REGISTER_BYTES (NUM_REGS * 4) | |
101 | ||
102 | /* Index within `registers' of the first byte of the space for | |
103 | register N. */ | |
104 | ||
105 | #define REGISTER_BYTE(N) ((N) * 4) | |
106 | ||
107 | /* Number of bytes of storage in the actual machine representation | |
108 | for register N. On the H8/300, all regs are 2 bytes. */ | |
109 | ||
110 | #define REGISTER_RAW_SIZE(N) (h8300hmode ? 4 : 2) | |
111 | ||
112 | /* Number of bytes of storage in the program's representation | |
113 | for register N. */ | |
114 | ||
115 | #define REGISTER_VIRTUAL_SIZE(N) (h8300hmode ? 4 : 2) | |
116 | ||
117 | /* Largest value REGISTER_RAW_SIZE can have. */ | |
118 | ||
119 | #define MAX_REGISTER_RAW_SIZE 4 | |
120 | ||
121 | /* Largest value REGISTER_VIRTUAL_SIZE can have. */ | |
122 | ||
123 | #define MAX_REGISTER_VIRTUAL_SIZE 4 | |
124 | ||
125 | /* Return the GDB type object for the "standard" data type | |
126 | of data in register N. */ | |
127 | ||
128 | #define REGISTER_VIRTUAL_TYPE(N) \ | |
129 | (h8300hmode ? builtin_type_unsigned_long : builtin_type_unsigned_short) | |
130 | ||
131 | /* Initializer for an array of names of registers. | |
132 | Entries beyond the first NUM_REGS are ignored. */ | |
133 | ||
134 | #define REGISTER_NAMES \ | |
135 | {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "sp", "ccr","pc","cycles","tick","inst"} | |
136 | ||
137 | /* An array of names of registers. */ | |
138 | ||
139 | extern char **h8300_register_names; | |
140 | #define REGISTER_NAME(i) h8300_register_names[i] | |
141 | ||
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. */ | |
148 | ||
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 */ | |
155 | ||
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, | |
158 | into VALBUF. */ | |
159 | ||
160 | /* FIXME: Won't work with both h8/300's. */ | |
161 | ||
c5aa993b | 162 | extern void h8300_extract_return_value PARAMS ((struct type *, char *, char *)); |
c906108c SS |
163 | #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ |
164 | h8300_extract_return_value (TYPE, (char *)(REGBUF), (char *)(VALBUF)) | |
165 | ||
166 | /* Write into appropriate registers a function return value | |
167 | of type TYPE, given in virtual format. Assumes floats are passed | |
168 | in d0/d1. */ | |
169 | /* FIXME: Won't work with both h8/300's. */ | |
170 | ||
c5aa993b | 171 | extern void h8300_store_return_value PARAMS ((struct type *, char *)); |
c906108c SS |
172 | #define STORE_RETURN_VALUE(TYPE,VALBUF) \ |
173 | h8300_store_return_value(TYPE, (char *) (VALBUF)) | |
174 | ||
175 | /* struct passing and returning stuff */ | |
176 | #define STORE_STRUCT_RETURN(STRUCT_ADDR, SP) \ | |
177 | write_register (0, STRUCT_ADDR) | |
178 | ||
179 | #define USE_STRUCT_CONVENTION(gcc_p, type) (1) | |
180 | ||
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). */ | |
184 | ||
185 | #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \ | |
186 | extract_address (REGBUF + REGISTER_BYTE (0), \ | |
187 | REGISTER_RAW_SIZE (0)) | |
c5aa993b | 188 | |
c906108c SS |
189 | /* Describe the pointer in each stack frame to the previous stack frame |
190 | (its caller). */ | |
191 | ||
192 | /* FRAME_CHAIN takes a frame's nominal address | |
193 | and produces the frame's chain-pointer. | |
194 | ||
195 | However, if FRAME_CHAIN_VALID returns zero, | |
196 | it means the given frame is the outermost one and has no caller. */ | |
197 | ||
198 | #define FRAME_CHAIN(FRAME) h8300_frame_chain(FRAME) | |
199 | CORE_ADDR h8300_frame_chain PARAMS ((struct frame_info *)); | |
200 | ||
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. */ | |
203 | ||
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 */ | |
207 | ||
c4093a6a | 208 | #define FRAME_CHAIN_VALID(fp,fi) func_frame_chain_valid (fp, fi) |
c906108c SS |
209 | |
210 | /* Define other aspects of the stack frame. */ | |
211 | ||
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. */ | |
392a587b JM |
215 | #define FRAMELESS_FUNCTION_INVOCATION(FI) \ |
216 | (frameless_look_for_prologue (FI)) | |
c906108c SS |
217 | |
218 | /* Any function with a frame looks like this | |
219 | SECOND ARG | |
220 | FIRST ARG | |
221 | RET PC | |
222 | SAVED R2 | |
223 | SAVED R3 | |
224 | SAVED FP <-FP POINTS HERE | |
225 | LOCALS0 | |
226 | LOCALS1 <-SP POINTS HERE | |
c5aa993b | 227 | */ |
c906108c SS |
228 | |
229 | #define FRAME_SAVED_PC(FRAME) h8300_frame_saved_pc(FRAME) | |
230 | ||
231 | #define FRAME_ARGS_ADDRESS(fi) frame_args_address(fi) | |
232 | ||
233 | #define FRAME_LOCALS_ADDRESS(fi) frame_locals_address(fi); | |
234 | ||
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. */ | |
237 | ||
238 | /* We can't tell how many args there are | |
239 | now that the C compiler delays popping them. */ | |
240 | ||
392a587b | 241 | #define FRAME_NUM_ARGS(fi) (-1) |
c906108c SS |
242 | |
243 | /* Return number of bytes at start of arglist that are not really args. */ | |
244 | ||
245 | #define FRAME_ARGS_SKIP 0 | |
246 | ||
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. */ | |
252 | ||
253 | #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \ | |
254 | h8300_frame_find_saved_regs(frame_info, &(frame_saved_regs)) | |
255 | \f | |
256 | ||
257 | typedef unsigned short INSN_WORD; | |
258 | ||
259 | ||
260 | #define PRINT_REGISTER_HOOK(regno) print_register_hook(regno) | |
261 | ||
262 | #define GDB_TARGET_IS_H8300 | |
263 | ||
264 | #define NUM_REALREGS 10 | |
c5aa993b | 265 | #define NOP { 0x01, 0x80} /* A sleep insn */ |
c906108c SS |
266 | |
267 | #define BELIEVE_PCC_PROMOTION 1 | |
268 | ||
269 | /* | |
270 | * CALL_DUMMY stuff: | |
271 | */ | |
272 | ||
7a292a7a | 273 | #define USE_GENERIC_DUMMY_FRAMES 1 |
c906108c SS |
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) | |
280 | ||
c5aa993b JM |
281 | extern CORE_ADDR h8300_push_arguments PARAMS ((int nargs, |
282 | struct value ** args, | |
c906108c SS |
283 | CORE_ADDR sp, |
284 | unsigned char struct_return, | |
285 | CORE_ADDR struct_addr)); | |
286 | extern CORE_ADDR h8300_push_return_address PARAMS ((CORE_ADDR, CORE_ADDR)); | |
287 | ||
7a292a7a | 288 | #define PC_IN_CALL_DUMMY(PC, SP, FP) generic_pc_in_call_dummy (PC, SP, FP) |
c906108c SS |
289 | #define FIX_CALL_DUMMY(DUMMY, START_SP, FUNADDR, NARGS, ARGS, TYPE, GCCP) |
290 | #define PUSH_ARGUMENTS(NARGS, ARGS, SP, STRUCT_RETURN, STRUCT_ADDR) \ | |
392a587b | 291 | (h8300_push_arguments (NARGS, ARGS, SP, STRUCT_RETURN, STRUCT_ADDR)) |
c906108c SS |
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) | |
297 | ||
298 | /* override the standard get_saved_register function with | |
299 | one that takes account of generic CALL_DUMMY frames */ | |
7a292a7a SS |
300 | #define GET_SAVED_REGISTER(raw_buffer, optimized, addrp, frame, regnum, lval) \ |
301 | generic_get_saved_register (raw_buffer, optimized, addrp, frame, regnum, lval) |