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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 | ||
22 | #define IEEE_FLOAT 1 | |
23 | ||
24 | /* Define the bit, byte, and word ordering of the machine. */ | |
25 | #define TARGET_BYTE_ORDER BIG_ENDIAN | |
fa4b55a1 | 26 | #undef TARGET_INT_BIT |
0a8f9d31 | 27 | #define TARGET_INT_BIT 16 |
0a8f9d31 SC |
28 | |
29 | ||
30 | /* Offset from address of function to start of its code. | |
31 | Zero on most machines. */ | |
32 | ||
33 | #define FUNCTION_START_OFFSET 0 | |
34 | ||
35 | /* Advance PC across any function entry prologue instructions | |
36 | to reach some "real" code. */ | |
37 | ||
38 | ||
39 | #define SKIP_PROLOGUE(ip) {(ip) = h8300_skip_prologue(ip);} | |
40 | extern CORE_ADDR h8300_skip_prologue (); | |
41 | ||
42 | ||
43 | /* Immediately after a function call, return the saved pc. | |
44 | Can't always go through the frames for this because on some machines | |
45 | the new frame is not set up until the new function executes | |
46 | some instructions. */ | |
47 | ||
48 | #define SAVED_PC_AFTER_CALL(frame) \ | |
49 | read_memory_integer (read_register (SP_REGNUM), 2) | |
50 | ||
51 | /* Stack grows downward. */ | |
52 | ||
53 | #define INNER_THAN < | |
54 | ||
55 | /* Sequence of bytes for breakpoint instruction. | |
56 | This is a TRAP instruction. The last 4 bits (0xf below) is the | |
57 | vector. Systems which don't use 0xf should define BPT_VECTOR | |
58 | themselves before including this file. */ | |
59 | ||
60 | ||
61 | #define BPT_VECTOR 0xf | |
62 | ||
63 | ||
64 | ||
65 | #define BREAKPOINT {0x4e, (0x40 | BPT_VECTOR)} | |
66 | ||
67 | ||
68 | /* If your kernel resets the pc after the trap happens you may need to | |
69 | define this before including this file. */ | |
70 | ||
71 | ||
72 | #define DECR_PC_AFTER_BREAK 2 | |
73 | ||
74 | ||
75 | /* Nonzero if instruction at PC is a return instruction. */ | |
76 | /* Allow any of the return instructions, including a trapv and a return | |
77 | from interupt. */ | |
78 | ||
79 | #define ABOUT_TO_RETURN(pc) ((read_memory_integer (pc, 2) & ~0x3) == 0x4e74) | |
80 | ||
81 | /* Return 1 if P points to an invalid floating point value. */ | |
82 | ||
83 | #define INVALID_FLOAT(p, len) 0 /* Just a first guess; not checked */ | |
84 | ||
85 | /* Say how long registers are. */ | |
86 | ||
fa4b55a1 | 87 | #define REGISTER_TYPE unsigned short |
0a8f9d31 SC |
88 | |
89 | # define NUM_REGS 10 | |
90 | # define REGISTER_BYTES (10*2) | |
91 | ||
92 | ||
93 | /* Index within `registers' of the first byte of the space for | |
94 | register N. */ | |
95 | ||
96 | #define REGISTER_BYTE(N) ((N) * 2) | |
97 | ||
98 | /* Number of bytes of storage in the actual machine representation | |
99 | for register N. On the H8/300, all regs are 2 bytes. */ | |
100 | ||
101 | #define REGISTER_RAW_SIZE(N) 2 | |
102 | ||
103 | /* Number of bytes of storage in the program's representation | |
104 | for register N. On the H8/300, all regs are 2 bytes. */ | |
105 | ||
106 | #define REGISTER_VIRTUAL_SIZE(N) 2 | |
107 | ||
108 | /* Largest value REGISTER_RAW_SIZE can have. */ | |
109 | ||
110 | #define MAX_REGISTER_RAW_SIZE 2 | |
111 | ||
112 | /* Largest value REGISTER_VIRTUAL_SIZE can have. */ | |
113 | ||
114 | #define MAX_REGISTER_VIRTUAL_SIZE 2 | |
115 | ||
116 | /* Nonzero if register N requires conversion | |
117 | from raw format to virtual format. */ | |
118 | ||
fa4b55a1 | 119 | #define REGISTER_CONVERTIBLE(N) 1 |
0a8f9d31 SC |
120 | |
121 | /* Convert data from raw format for register REGNUM | |
122 | to virtual format for register REGNUM. */ | |
123 | ||
fa4b55a1 | 124 | /*#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) */ |
0a8f9d31 SC |
125 | |
126 | /* Convert data from virtual format for register REGNUM | |
127 | to raw format for register REGNUM. */ | |
128 | ||
fa4b55a1 | 129 | /*#define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) */ |
0a8f9d31 SC |
130 | |
131 | /* Return the GDB type object for the "standard" data type | |
132 | of data in register N. */ | |
133 | ||
fa4b55a1 | 134 | #define REGISTER_VIRTUAL_TYPE(N) builtin_type_unsigned_short |
0a8f9d31 SC |
135 | |
136 | ||
137 | /* Initializer for an array of names of registers. | |
138 | Entries beyond the first NUM_REGS are ignored. */ | |
139 | ||
140 | #define REGISTER_NAMES \ | |
141 | {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "sp","ccr","pc"} | |
142 | ||
143 | ||
144 | /* Register numbers of various important registers. | |
145 | Note that some of these values are "real" register numbers, | |
146 | and correspond to the general registers of the machine, | |
147 | and some are "phony" register numbers which are too large | |
148 | to be actual register numbers as far as the user is concerned | |
149 | but do serve to get the desired values when passed to read_register. */ | |
150 | ||
151 | ||
152 | #define FP_REGNUM 6 /* Contains address 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 | /* Store the address of the place in which to copy the structure the | |
158 | subroutine will return. This is called from call_function. */ | |
159 | ||
160 | #define STORE_STRUCT_RETURN(ADDR, SP) \ | |
161 | { write_register (0, (ADDR)); abort(); } | |
162 | ||
163 | /* Extract from an array REGBUF containing the (raw) register state | |
164 | a function return value of type TYPE, and copy that, in virtual format, | |
165 | into VALBUF. This is assuming that floating point values are returned | |
166 | as doubles in d0/d1. */ | |
167 | ||
168 | ||
169 | #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ | |
170 | bcopy ((char *)(REGBUF) + \ | |
171 | (TYPE_LENGTH(TYPE) >= 4 ? 0 : 4 - TYPE_LENGTH(TYPE)), \ | |
172 | VALBUF, TYPE_LENGTH(TYPE)) | |
173 | ||
174 | ||
175 | /* Write into appropriate registers a function return value | |
176 | of type TYPE, given in virtual format. Assumes floats are passed | |
177 | in d0/d1. */ | |
178 | ||
179 | ||
180 | #define STORE_RETURN_VALUE(TYPE,VALBUF) \ | |
181 | write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE)) | |
182 | ||
183 | ||
184 | /* Extract from an array REGBUF containing the (raw) register state | |
185 | the address in which a function should return its structure value, | |
186 | as a CORE_ADDR (or an expression that can be used as one). */ | |
187 | ||
188 | #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(CORE_ADDR *)(REGBUF)) | |
189 | \f | |
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 | /* In the case of the H8/300, the frame's nominal address | |
200 | is the address of a 2-byte word containing the calling frame's address. */ | |
201 | ||
202 | ||
203 | ||
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 blockframe.c */ | |
208 | ||
209 | #define FRAME_CHAIN_VALID(chain, thisframe) \ | |
210 | (chain != 0 \ | |
211 | && !(inside_main_scope ((thisframe)->pc)) \ | |
212 | && !(inside_entry_scope ((thisframe)->pc))) | |
213 | ||
214 | ||
215 | /* Define other aspects of the stack frame. */ | |
216 | ||
217 | /* A macro that tells us whether the function invocation represented | |
218 | by FI does not have a frame on the stack associated with it. If it | |
219 | does not, FRAMELESS is set to 1, else 0. */ | |
220 | #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \ | |
221 | (FRAMELESS) = frameless_look_for_prologue(FI) | |
222 | ||
223 | #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 2, 2)) | |
224 | ||
225 | #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame) | |
226 | ||
227 | #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame) | |
228 | ||
229 | /* Set VAL to the number of args passed to frame described by FI. | |
230 | Can set VAL to -1, meaning no way to tell. */ | |
231 | ||
232 | /* We can't tell how many args there are | |
233 | now that the C compiler delays popping them. */ | |
234 | ||
235 | #define FRAME_NUM_ARGS(val,fi) (val = -1) | |
236 | ||
237 | ||
238 | /* Return number of bytes at start of arglist that are not really args. */ | |
239 | ||
240 | #define FRAME_ARGS_SKIP 4 | |
241 | ||
242 | /* Put here the code to store, into a struct frame_saved_regs, | |
243 | the addresses of the saved registers of frame described by FRAME_INFO. | |
244 | This includes special registers such as pc and fp saved in special | |
245 | ways in the stack frame. sp is even more special: | |
246 | the address we return for it IS the sp for the next frame. */ | |
247 | ||
248 | #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) abort(); | |
249 | \f | |
250 | ||
251 | /* Push an empty stack frame, to record the current PC, etc. */ | |
252 | ||
253 | #define PUSH_DUMMY_FRAME { h8300_push_dummy_frame (); } | |
254 | ||
255 | /* Discard from the stack the innermost frame, restoring all registers. */ | |
256 | ||
257 | #define POP_FRAME { h8300_pop_frame (); } | |
258 | ||
fa4b55a1 SC |
259 | #define SHORT_INT_MAX 32767 |
260 | #define SHORT_INT_MIN -32768 | |
261 | ||
262 | #undef longest_to_int | |
263 | #define longest_to_int(x) (x & 0xffff) | |
264 | ||
400943fb | 265 | |
fa4b55a1 SC |
266 | #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \ |
267 | { bcopy ((FROM), (TO), 2); } | |
268 | #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \ | |
269 | { bcopy ((FROM), (TO), 4); } |