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dd3b648e RP |
1 | /* Parameters for execution on a Sun 386i, for GDB, the GNU debugger. |
2 | Copyright (C) 1986, 1987 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GDB. | |
5 | ||
6 | GDB 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 1, or (at your option) | |
9 | any later version. | |
10 | ||
11 | GDB 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 GDB; see the file COPYING. If not, write to | |
18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
20 | #define TARGET_BYTE_ORDER LITTLE_ENDIAN | |
21 | ||
22 | #ifndef sun386 | |
23 | #define sun386 | |
24 | #endif | |
25 | #define SUNOS4 | |
26 | #define USE_MACHINE_REG_H | |
27 | ||
28 | /* Perhaps some day this will work even without the following #define */ | |
29 | #define COFF_ENCAPSULATE | |
30 | ||
31 | #ifdef COFF_ENCAPSULATE | |
32 | #define NAMES_HAVE_UNDERSCORE | |
33 | /* Avoid conflicts between "a.out.gnu.h" and <sys/exec.h> */ | |
34 | #define _EXEC_ | |
35 | #endif | |
36 | ||
37 | #define BROKEN_LARGE_ALLOCA | |
38 | ||
39 | /* sun386 ptrace seems unable to change the frame pointer */ | |
40 | #define PTRACE_FP_BUG | |
41 | ||
42 | /* Debugger information will be in DBX format. */ | |
43 | ||
44 | #define READ_DBX_FORMAT | |
45 | ||
46 | /* Offset from address of function to start of its code. | |
47 | Zero on most machines. */ | |
48 | ||
49 | #define FUNCTION_START_OFFSET 0 | |
50 | ||
51 | /* Advance PC across any function entry prologue instructions | |
52 | to reach some "real" code. */ | |
53 | ||
54 | #define SKIP_PROLOGUE(frompc) {(frompc) = i386_skip_prologue((frompc));} | |
55 | ||
56 | /* Immediately after a function call, return the saved pc. | |
57 | Can't always go through the frames for this because on some machines | |
58 | the new frame is not set up until the new function executes | |
59 | some instructions. */ | |
60 | ||
61 | #define SAVED_PC_AFTER_CALL(frame) \ | |
62 | (read_memory_integer (read_register (SP_REGNUM), 4)) | |
63 | ||
64 | /* Address of end of stack space. */ | |
65 | ||
66 | #define STACK_END_ADDR 0xfc000000 | |
67 | ||
68 | /* Stack grows downward. */ | |
69 | ||
70 | #define INNER_THAN < | |
71 | ||
72 | /* Sequence of bytes for breakpoint instruction. */ | |
73 | ||
74 | #define BREAKPOINT {0xcc} | |
75 | ||
76 | /* Amount PC must be decremented by after a breakpoint. | |
77 | This is often the number of bytes in BREAKPOINT | |
78 | but not always. */ | |
79 | ||
80 | #define DECR_PC_AFTER_BREAK 1 | |
81 | ||
82 | /* Nonzero if instruction at PC is a return instruction. */ | |
83 | ||
84 | #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 1) == 0xc3) | |
85 | ||
86 | /* Return 1 if P points to an invalid floating point value. | |
87 | LEN is the length in bytes -- not relevant on the 386. */ | |
88 | ||
89 | #define INVALID_FLOAT(p, len) (0) | |
90 | ||
91 | /* Largest integer type */ | |
92 | #define LONGEST long | |
93 | ||
94 | /* Name of the builtin type for the LONGEST type above. */ | |
95 | #define BUILTIN_TYPE_LONGEST builtin_type_long | |
96 | ||
97 | /* Say how long (ordinary) registers are. */ | |
98 | ||
99 | #define REGISTER_TYPE long | |
100 | ||
101 | /* Number of machine registers */ | |
102 | ||
103 | #define NUM_REGS 35 | |
104 | ||
105 | /* Initializer for an array of names of registers. | |
106 | There should be NUM_REGS strings in this initializer. */ | |
107 | ||
108 | /* the order of the first 8 registers must match the compiler's | |
109 | * numbering scheme (which is the same as the 386 scheme) | |
110 | * also, this table must match regmap in i386-pinsn.c. | |
111 | */ | |
112 | #define REGISTER_NAMES { "gs", "fs", "es", "ds", \ | |
113 | "edi", "esi", "ebp", "esp", \ | |
114 | "ebx", "edx", "ecx", "eax", \ | |
115 | "retaddr", "trapnum", "errcode", "ip", \ | |
116 | "cs", "ps", "sp", "ss", \ | |
117 | "fst0", "fst1", "fst2", "fst3", \ | |
118 | "fst4", "fst5", "fst6", "fst7", \ | |
119 | "fctrl", "fstat", "ftag", "fip", \ | |
120 | "fcs", "fopoff", "fopsel" \ | |
121 | } | |
122 | ||
123 | /* Register numbers of various important registers. | |
124 | Note that some of these values are "real" register numbers, | |
125 | and correspond to the general registers of the machine, | |
126 | and some are "phony" register numbers which are too large | |
127 | to be actual register numbers as far as the user is concerned | |
128 | but do serve to get the desired values when passed to read_register. */ | |
129 | ||
130 | #define FP_REGNUM 6 /* Contains address of executing stack frame */ | |
131 | #define SP_REGNUM 18 /* Contains address of top of stack */ | |
132 | #define PS_REGNUM 17 /* Contains processor status */ | |
133 | #define PC_REGNUM 15 /* Contains program counter */ | |
134 | #define FP0_REGNUM 20 /* Floating point register 0 */ | |
135 | #define FPC_REGNUM 28 /* 80387 control register */ | |
136 | ||
137 | /* Total amount of space needed to store our copies of the machine's | |
138 | register state, the array `registers'. */ | |
139 | #define REGISTER_BYTES (20*4+8*10+7*4) | |
140 | ||
141 | /* Index within `registers' of the first byte of the space for | |
142 | register N. */ | |
143 | ||
144 | #define REGISTER_BYTE(N) \ | |
145 | ((N) >= FPC_REGNUM ? (((N) - FPC_REGNUM) * 4) + 160 \ | |
146 | : (N) >= FP0_REGNUM ? (((N) - FP0_REGNUM) * 10) + 80 \ | |
147 | : (N) * 4) | |
148 | ||
149 | /* Number of bytes of storage in the actual machine representation | |
150 | for register N. */ | |
151 | ||
152 | #define REGISTER_RAW_SIZE(N) (((unsigned)((N) - FP0_REGNUM)) < 8 ? 10 : 4) | |
153 | ||
154 | /* Number of bytes of storage in the program's representation | |
155 | for register N. */ | |
156 | ||
157 | #define REGISTER_VIRTUAL_SIZE(N) (((unsigned)((N) - FP0_REGNUM)) < 8 ? 8 : 4) | |
158 | ||
159 | /* Largest value REGISTER_RAW_SIZE can have. */ | |
160 | ||
161 | #define MAX_REGISTER_RAW_SIZE 10 | |
162 | ||
163 | /* Largest value REGISTER_VIRTUAL_SIZE can have. */ | |
164 | ||
165 | #define MAX_REGISTER_VIRTUAL_SIZE 8 | |
166 | ||
167 | /* Nonzero if register N requires conversion | |
168 | from raw format to virtual format. */ | |
169 | ||
170 | #define REGISTER_CONVERTIBLE(N) (((unsigned)((N) - FP0_REGNUM)) < 8) | |
171 | ||
172 | /* Convert data from raw format for register REGNUM | |
173 | to virtual format for register REGNUM. */ | |
174 | ||
175 | #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \ | |
176 | { if ((REGNUM) >= FP0_REGNUM && (REGNUM) < FPC_REGNUM) \ | |
177 | i387_to_double ((FROM), (TO)); \ | |
178 | else \ | |
179 | bcopy ((FROM), (TO), 4); } | |
180 | ||
181 | /* Convert data from virtual format for register REGNUM | |
182 | to raw format for register REGNUM. */ | |
183 | ||
184 | #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \ | |
185 | { if ((REGNUM) >= FP0_REGNUM && (REGNUM) < FPC_REGNUM) \ | |
186 | double_to_i387 ((FROM), (TO)); \ | |
187 | else \ | |
188 | bcopy ((FROM), (TO), 4); } | |
189 | ||
190 | /* Return the GDB type object for the "standard" data type | |
191 | of data in register N. */ | |
192 | ||
193 | #define REGISTER_VIRTUAL_TYPE(N) \ | |
194 | (((unsigned)((N) - FP0_REGNUM)) < 8 ? builtin_type_double : builtin_type_int) | |
195 | ||
196 | /* Store the address of the place in which to copy the structure the | |
197 | subroutine will return. This is called from call_function. */ | |
198 | ||
199 | #define STORE_STRUCT_RETURN(ADDR, SP) \ | |
200 | { (SP) -= sizeof (ADDR); \ | |
201 | write_memory ((SP), &(ADDR), sizeof (ADDR)); } | |
202 | ||
203 | /* Extract from an array REGBUF containing the (raw) register state | |
204 | a function return value of type TYPE, and copy that, in virtual format, | |
205 | into VALBUF. */ | |
206 | ||
207 | #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ | |
208 | bcopy (REGBUF + REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 11), VALBUF, TYPE_LENGTH (TYPE)) | |
209 | ||
210 | /* Write into appropriate registers a function return value | |
211 | of type TYPE, given in virtual format. */ | |
212 | ||
213 | #define STORE_RETURN_VALUE(TYPE,VALBUF) \ | |
214 | write_register_bytes (REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 11), VALBUF, TYPE_LENGTH (TYPE)) | |
215 | ||
216 | /* Extract from an array REGBUF containing the (raw) register state | |
217 | the address in which a function should return its structure value, | |
218 | as a CORE_ADDR (or an expression that can be used as one). */ | |
219 | ||
220 | #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF)) | |
221 | \f | |
222 | /* Describe the pointer in each stack frame to the previous stack frame | |
223 | (its caller). */ | |
224 | ||
225 | /* FRAME_CHAIN takes a frame's nominal address | |
226 | and produces the frame's chain-pointer. | |
227 | ||
228 | FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address | |
229 | and produces the nominal address of the caller frame. | |
230 | ||
231 | However, if FRAME_CHAIN_VALID returns zero, | |
232 | it means the given frame is the outermost one and has no caller. | |
233 | In that case, FRAME_CHAIN_COMBINE is not used. */ | |
234 | ||
235 | #define FRAME_CHAIN(thisframe) \ | |
236 | (outside_startup_file ((thisframe)->pc) ? \ | |
237 | read_memory_integer ((thisframe)->frame, 4) :\ | |
238 | 0) | |
239 | ||
240 | #define FRAME_CHAIN_VALID(chain, thisframe) \ | |
241 | (chain != 0 && (outside_startup_file (FRAME_SAVED_PC (thisframe)))) | |
242 | ||
243 | #define FRAME_CHAIN_COMBINE(chain, thisframe) (chain) | |
244 | ||
245 | /* Define other aspects of the stack frame. */ | |
246 | ||
247 | /* A macro that tells us whether the function invocation represented | |
248 | by FI does not have a frame on the stack associated with it. If it | |
249 | does not, FRAMELESS is set to 1, else 0. */ | |
250 | #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \ | |
251 | { (FRAMELESS) = frameless_look_for_prologue (FI); } | |
252 | ||
253 | #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4)) | |
254 | ||
255 | #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame) | |
256 | ||
257 | #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame) | |
258 | ||
259 | /* Return number of args passed to a frame. | |
260 | Can return -1, meaning no way to tell. */ | |
261 | ||
262 | #define FRAME_NUM_ARGS(numargs, fi) (numargs) = i386_frame_num_args(fi) | |
263 | ||
264 | /* Return number of bytes at start of arglist that are not really args. */ | |
265 | ||
266 | #define FRAME_ARGS_SKIP 8 | |
267 | ||
268 | /* Put here the code to store, into a struct frame_saved_regs, | |
269 | the addresses of the saved registers of frame described by FRAME_INFO. | |
270 | This includes special registers such as pc and fp saved in special | |
271 | ways in the stack frame. sp is even more special: | |
272 | the address we return for it IS the sp for the next frame. */ | |
273 | ||
274 | #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \ | |
275 | { i386_frame_find_saved_regs ((frame_info), &(frame_saved_regs)); } | |
276 | ||
277 | \f | |
278 | /* Things needed for making the inferior call functions. */ | |
279 | ||
280 | /* Push an empty stack frame, to record the current PC, etc. */ | |
281 | ||
282 | #define PUSH_DUMMY_FRAME { i386_push_dummy_frame (); } | |
283 | ||
284 | /* Discard from the stack the innermost frame, restoring all registers. */ | |
285 | ||
286 | #define POP_FRAME { i386_pop_frame (); } | |
287 | ||
288 | /* this is | |
289 | * call 11223344 (32 bit relative) | |
290 | * int3 | |
291 | */ | |
292 | ||
293 | #define CALL_DUMMY { 0x223344e8, 0xcc11 } | |
294 | ||
295 | #define CALL_DUMMY_LENGTH 8 | |
296 | ||
297 | #define CALL_DUMMY_START_OFFSET 0 /* Start execution at beginning of dummy */ | |
298 | ||
299 | /* Insert the specified number of args and function address | |
300 | into a call sequence of the above form stored at DUMMYNAME. */ | |
301 | ||
302 | #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \ | |
303 | { \ | |
304 | *(int *)((char *)(dummyname) + 1) = (int)(fun) - (pc) - 5; \ | |
305 | } |