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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., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
20 | /* Contributed by Steve Chamberlain sac@cygnus.com */ | |
21 | ||
ad8aefa5 | 22 | extern int HMODE; |
5076de82 | 23 | |
36e73225 | 24 | #define BINWORD (HMODE?4:2) |
ad8aefa5 | 25 | |
5076de82 FF |
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 | ||
5076de82 FF |
32 | /* Zero the frame_saved_regs pointer when the frame is initialized, |
33 | so that FRAME_FIND_SAVED_REGS () will know to allocate and | |
34 | initialize a frame_saved_regs struct the first time it is called. | |
35 | Set the arg_pointer to -1, which is not valid; 0 and other values | |
36 | indicate real, cached values. */ | |
37 | ||
38 | #define INIT_EXTRA_FRAME_INFO(fromleaf, fi) \ | |
39 | init_extra_frame_info (fromleaf, fi) | |
40 | ||
41 | extern void init_extra_frame_info (); | |
42 | ||
5076de82 FF |
43 | #define IEEE_FLOAT |
44 | /* Define the bit, byte, and word ordering of the machine. */ | |
45 | #define TARGET_BYTE_ORDER BIG_ENDIAN | |
46 | #undef TARGET_INT_BIT | |
36e73225 SC |
47 | #define TARGET_INT_BIT 16 |
48 | #undef TARGET_LONG_BIT | |
49 | #define TARGET_LONG_BIT 32 | |
5076de82 | 50 | #undef TARGET_PTR_BIT |
36e73225 | 51 | #define TARGET_PTR_BIT (HMODE ? 32:16) |
5076de82 | 52 | |
5076de82 FF |
53 | /* Offset from address of function to start of its code. |
54 | Zero on most machines. */ | |
55 | ||
56 | #define FUNCTION_START_OFFSET 0 | |
57 | ||
58 | /* Advance PC across any function entry prologue instructions | |
59 | to reach some "real" code. */ | |
60 | ||
5076de82 FF |
61 | #define SKIP_PROLOGUE(ip) {(ip) = h8300_skip_prologue(ip);} |
62 | extern CORE_ADDR h8300_skip_prologue (); | |
63 | ||
5076de82 FF |
64 | /* Immediately after a function call, return the saved pc. |
65 | Can't always go through the frames for this because on some machines | |
66 | the new frame is not set up until the new function executes | |
67 | some instructions. */ | |
68 | ||
69 | #define SAVED_PC_AFTER_CALL(frame) \ | |
36e73225 | 70 | read_memory_unsigned_integer (read_register (SP_REGNUM), BINWORD) |
5076de82 FF |
71 | |
72 | /* Stack grows downward. */ | |
73 | ||
74 | #define INNER_THAN < | |
75 | ||
36e73225 | 76 | #define BREAKPOINT {0x7A, 0xFF} |
5076de82 | 77 | |
5076de82 FF |
78 | /* If your kernel resets the pc after the trap happens you may need to |
79 | define this before including this file. */ | |
80 | ||
5076de82 FF |
81 | #define DECR_PC_AFTER_BREAK 0 |
82 | ||
5076de82 FF |
83 | /* Nonzero if instruction at PC is a return instruction. */ |
84 | /* Allow any of the return instructions, including a trapv and a return | |
85 | from interupt. */ | |
86 | ||
36e73225 | 87 | #define ABOUT_TO_RETURN(pc) ((read_memory_unsigned_integer (pc, 2) & ~0x3) == 0x4e74) |
5076de82 FF |
88 | |
89 | /* Return 1 if P points to an invalid floating point value. */ | |
90 | ||
91 | #define INVALID_FLOAT(p, len) 0 /* Just a first guess; not checked */ | |
92 | ||
93 | /* Say how long registers are. */ | |
94 | ||
95 | #define REGISTER_TYPE unsigned short | |
96 | ||
97 | /*# define NUM_REGS 20 /* 20 for fake HW support */ | |
ad8aefa5 DE |
98 | #define NUM_REGS 13 |
99 | #define REGISTER_BYTES (NUM_REGS * 4) | |
5076de82 FF |
100 | |
101 | /* Index within `registers' of the first byte of the space for | |
102 | register N. */ | |
103 | ||
36e73225 | 104 | #define REGISTER_BYTE(N) ((N) * 4) |
5076de82 FF |
105 | |
106 | /* Number of bytes of storage in the actual machine representation | |
107 | for register N. On the H8/300, all regs are 2 bytes. */ | |
108 | ||
ad8aefa5 | 109 | #define REGISTER_RAW_SIZE(N) (HMODE ? 4 : 2) |
5076de82 FF |
110 | |
111 | /* Number of bytes of storage in the program's representation | |
36e73225 | 112 | for register N. */ |
5076de82 | 113 | |
36e73225 | 114 | #define REGISTER_VIRTUAL_SIZE(N) (HMODE ? 4 : 2) |
5076de82 FF |
115 | |
116 | /* Largest value REGISTER_RAW_SIZE can have. */ | |
117 | ||
36e73225 | 118 | #define MAX_REGISTER_RAW_SIZE 4 |
5076de82 FF |
119 | |
120 | /* Largest value REGISTER_VIRTUAL_SIZE can have. */ | |
121 | ||
36e73225 | 122 | #define MAX_REGISTER_VIRTUAL_SIZE 4 |
5076de82 FF |
123 | |
124 | /* Nonzero if register N requires conversion | |
125 | from raw format to virtual format. */ | |
126 | ||
127 | #define REGISTER_CONVERTIBLE(N) 1 | |
128 | ||
129 | /* Convert data from raw format for register REGNUM | |
130 | to virtual format for register REGNUM. */ | |
131 | ||
132 | /*#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) */ | |
133 | ||
134 | /* Convert data from virtual format for register REGNUM | |
135 | to raw format for register REGNUM. */ | |
136 | ||
137 | /*#define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) */ | |
138 | ||
139 | /* Return the GDB type object for the "standard" data type | |
140 | of data in register N. */ | |
141 | ||
36e73225 | 142 | #define REGISTER_VIRTUAL_TYPE(N) \ |
ad8aefa5 | 143 | (HMODE ? builtin_type_unsigned_long : builtin_type_unsigned_short) |
5076de82 FF |
144 | |
145 | /* Initializer for an array of names of registers. | |
146 | Entries beyond the first NUM_REGS are ignored. */ | |
147 | ||
148 | #if NUM_REGS==20 | |
149 | #define REGISTER_NAMES \ | |
150 | {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "sp",\ | |
151 | "ccr","pc","cycles","hcheck","tier","tcsr","frc",\ | |
152 | "ocra","ocrb","tcr","tocr","icra"} | |
153 | #else | |
154 | #define REGISTER_NAMES \ | |
36e73225 | 155 | {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "sp", "ccr","pc","cycles","tick","inst"} |
5076de82 FF |
156 | #endif |
157 | ||
158 | /* Register numbers of various important registers. | |
159 | Note that some of these values are "real" register numbers, | |
160 | and correspond to the general registers of the machine, | |
161 | and some are "phony" register numbers which are too large | |
162 | to be actual register numbers as far as the user is concerned | |
163 | but do serve to get the desired values when passed to read_register. */ | |
164 | ||
5076de82 FF |
165 | #define FP_REGNUM 6 /* Contains address of executing stack frame */ |
166 | #define SP_REGNUM 7 /* Contains address of top of stack */ | |
167 | #define CCR_REGNUM 8 /* Contains processor status */ | |
168 | #define PC_REGNUM 9 /* Contains program counter */ | |
169 | ||
170 | /* Store the address of the place in which to copy the structure the | |
171 | subroutine will return. This is called from call_function. */ | |
172 | ||
173 | /*#define STORE_STRUCT_RETURN(ADDR, SP) \ | |
174 | { write_register (0, (ADDR)); abort(); }*/ | |
175 | ||
176 | /* Extract from an array REGBUF containing the (raw) register state | |
177 | a function return value of type TYPE, and copy that, in virtual format, | |
178 | into VALBUF. */ | |
ad8aefa5 | 179 | /* FIXME: Won't work with both h8/300's. */ |
5076de82 FF |
180 | |
181 | #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ | |
182 | bcopy ((char *)(REGBUF), VALBUF, TYPE_LENGTH(TYPE)) | |
183 | ||
5076de82 FF |
184 | /* Write into appropriate registers a function return value |
185 | of type TYPE, given in virtual format. Assumes floats are passed | |
186 | in d0/d1. */ | |
ad8aefa5 | 187 | /* FIXME: Won't work with both h8/300's. */ |
5076de82 FF |
188 | |
189 | #define STORE_RETURN_VALUE(TYPE,VALBUF) \ | |
190 | write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE)) | |
191 | ||
5076de82 FF |
192 | /* Extract from an array REGBUF containing the (raw) register state |
193 | the address in which a function should return its structure value, | |
194 | as a CORE_ADDR (or an expression that can be used as one). */ | |
ad8aefa5 | 195 | /* FIXME: Won't work with both h8/300's. */ |
5076de82 FF |
196 | |
197 | #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF)) | |
198 | \f | |
199 | /* Describe the pointer in each stack frame to the previous stack frame | |
200 | (its caller). */ | |
201 | ||
202 | /* FRAME_CHAIN takes a frame's nominal address | |
203 | and produces the frame's chain-pointer. | |
204 | ||
205 | However, if FRAME_CHAIN_VALID returns zero, | |
206 | it means the given frame is the outermost one and has no caller. */ | |
207 | ||
208 | /* In the case of the H8/300, the frame's nominal address | |
209 | is the address of a 2-byte word containing the calling frame's address. */ | |
210 | ||
211 | /* Use the alternate method of avoiding running up off the end of | |
212 | the frame chain or following frames back into the startup code. | |
213 | See the comments in objfile.h */ | |
214 | ||
215 | #define FRAME_CHAIN_VALID_ALTERNATE | |
216 | ||
217 | /* Define other aspects of the stack frame. */ | |
218 | ||
219 | /* A macro that tells us whether the function invocation represented | |
220 | by FI does not have a frame on the stack associated with it. If it | |
221 | does not, FRAMELESS is set to 1, else 0. */ | |
222 | #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \ | |
223 | (FRAMELESS) = frameless_look_for_prologue(FI) | |
224 | ||
225 | /* Any function with a frame looks like this | |
226 | SECOND ARG | |
227 | FIRST ARG | |
228 | RET PC | |
229 | SAVED R2 | |
230 | SAVED R3 | |
231 | SAVED FP <-FP POINTS HERE | |
232 | LOCALS0 | |
233 | LOCALS1 <-SP POINTS HERE | |
5076de82 | 234 | */ |
ad8aefa5 | 235 | |
5076de82 FF |
236 | #define FRAME_SAVED_PC(FRAME) frame_saved_pc(FRAME) |
237 | ||
238 | #define FRAME_ARGS_ADDRESS(fi) frame_args_address(fi) | |
239 | ||
240 | #define FRAME_LOCALS_ADDRESS(fi) frame_locals_address(fi); | |
241 | ||
242 | /* Set VAL to the number of args passed to frame described by FI. | |
243 | Can set VAL to -1, meaning no way to tell. */ | |
244 | ||
245 | /* We can't tell how many args there are | |
246 | now that the C compiler delays popping them. */ | |
247 | ||
248 | #define FRAME_NUM_ARGS(val,fi) (val = -1) | |
249 | ||
5076de82 FF |
250 | /* Return number of bytes at start of arglist that are not really args. */ |
251 | ||
252 | #define FRAME_ARGS_SKIP 0 | |
253 | ||
254 | /* Put here the code to store, into a struct frame_saved_regs, | |
255 | the addresses of the saved registers of frame described by FRAME_INFO. | |
256 | This includes special registers such as pc and fp saved in special | |
257 | ways in the stack frame. sp is even more special: | |
258 | the address we return for it IS the sp for the next frame. */ | |
259 | ||
260 | #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \ | |
261 | frame_find_saved_regs(frame_info, &(frame_saved_regs)) | |
262 | \f | |
263 | ||
264 | /* Push an empty stack frame, to record the current PC, etc. */ | |
265 | ||
266 | /*#define PUSH_DUMMY_FRAME { h8300_push_dummy_frame (); }*/ | |
267 | ||
268 | /* Discard from the stack the innermost frame, restoring all registers. */ | |
269 | ||
270 | #define POP_FRAME { h8300_pop_frame (); } | |
271 | ||
272 | #define SHORT_INT_MAX 32767 | |
273 | #define SHORT_INT_MIN -32768 | |
274 | ||
5076de82 | 275 | #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \ |
36e73225 | 276 | { memcpy((TO), (FROM), BINWORD); } |
5076de82 | 277 | #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \ |
36e73225 | 278 | { memcpy((TO), (FROM), BINWORD); } |
5076de82 FF |
279 | |
280 | #define BEFORE_MAIN_LOOP_HOOK \ | |
281 | hms_before_main_loop(); | |
282 | ||
283 | typedef unsigned short INSN_WORD; | |
284 | ||
285 | #define ADDR_BITS_REMOVE(addr) ((addr) & 0xffff) | |
286 | #define ADDR_BITS_SET(addr) (((addr))) | |
287 | ||
5076de82 FF |
288 | #define DONT_USE_REMOTE |
289 | ||
5076de82 | 290 | #define PRINT_REGISTER_HOOK(regno) print_register_hook(regno) |