e91b87a3 |
1 | /* |
2 | * Changes for 80386 by Pace Willisson (pace@prep.ai.mit.edu) |
3 | * July 1988 |
4 | */ |
5 | |
6 | /* |
7 | Copyright (C) 1986, 1987 Free Software Foundation, Inc. |
8 | |
9 | GDB is distributed in the hope that it will be useful, but WITHOUT ANY |
10 | WARRANTY. No author or distributor accepts responsibility to anyone |
11 | for the consequences of using it or for whether it serves any |
12 | particular purpose or works at all, unless he says so in writing. |
13 | Refer to the GDB General Public License for full details. |
14 | |
15 | Everyone is granted permission to copy, modify and redistribute GDB, |
16 | but only under the conditions described in the GDB General Public |
17 | License. A copy of this license is supposed to have been given to you |
18 | along with GDB so you can know your rights and responsibilities. It |
19 | should be in a file named COPYING. Among other things, the copyright |
20 | notice and this notice must be preserved on all copies. |
21 | |
22 | In other words, go ahead and share GDB, but don't try to stop |
23 | anyone else from sharing it farther. Help stamp out software hoarding! |
24 | */ |
25 | |
26 | #ifndef i386 |
27 | #define i386 |
28 | #endif |
29 | |
30 | /* define USG if you are using sys5 /usr/include's */ |
31 | #define USG |
32 | |
33 | /* USG systems need these */ |
34 | #define vfork() fork() |
35 | #define MAXPATHLEN 500 |
36 | |
37 | /* define this if you don't have the extension to coff that allows |
38 | * file names to appear in the string table |
39 | * (aux.x_file.x_foff) |
40 | */ |
41 | #define COFF_NO_LONG_FILE_NAMES |
42 | |
43 | /* turn this on when rest of gdb is ready */ |
44 | /* #define IEEE_FLOAT */ |
45 | |
46 | #define NBPG NBPC |
47 | #define UPAGES USIZE |
48 | |
49 | #define HAVE_TERMIO |
50 | |
51 | /* Get rid of any system-imposed stack limit if possible. */ |
52 | |
53 | /* #define SET_STACK_LIMIT_HUGE not in sys5 */ |
54 | |
55 | /* Define this if the C compiler puts an underscore at the front |
56 | of external names before giving them to the linker. */ |
57 | |
58 | /* #define NAMES_HAVE_UNDERSCORE */ |
59 | |
60 | /* Specify debugger information format. */ |
61 | |
62 | /* #define READ_DBX_FORMAT */ |
63 | #define COFF_FORMAT |
64 | |
65 | /* number of traps that happen between exec'ing the shell |
66 | * to run an inferior, and when we finally get to |
67 | * the inferior code. This is 2 on most implementations. |
68 | */ |
69 | #define START_INFERIOR_TRAPS_EXPECTED 4 |
70 | |
71 | /* Offset from address of function to start of its code. |
72 | Zero on most machines. */ |
73 | |
74 | #define FUNCTION_START_OFFSET 0 |
75 | |
76 | /* Advance PC across any function entry prologue instructions |
77 | to reach some "real" code. */ |
78 | |
79 | #define SKIP_PROLOGUE(frompc) {(frompc) = i386_skip_prologue((frompc));} |
80 | |
81 | /* Immediately after a function call, return the saved pc. |
82 | Can't always go through the frames for this because on some machines |
83 | the new frame is not set up until the new function executes |
84 | some instructions. */ |
85 | |
86 | #define SAVED_PC_AFTER_CALL(frame) \ |
87 | (read_memory_integer (read_register (SP_REGNUM), 4)) |
88 | |
89 | /* This is the amount to subtract from u.u_ar0 |
90 | to get the offset in the core file of the register values. */ |
91 | |
92 | #define KERNEL_U_ADDR 0xe0000000 |
93 | |
94 | /* Address of end of stack space. */ |
95 | |
96 | #define STACK_END_ADDR 0x80000000 |
97 | |
98 | /* Stack grows downward. */ |
99 | |
100 | #define INNER_THAN < |
101 | |
102 | /* Sequence of bytes for breakpoint instruction. */ |
103 | |
104 | #define BREAKPOINT {0xcc} |
105 | |
106 | /* Amount PC must be decremented by after a breakpoint. |
107 | This is often the number of bytes in BREAKPOINT |
108 | but not always. */ |
109 | |
110 | #define DECR_PC_AFTER_BREAK 1 |
111 | |
112 | /* Nonzero if instruction at PC is a return instruction. */ |
113 | |
114 | #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 1) == 0xc3) |
115 | |
116 | /* Return 1 if P points to an invalid floating point value. |
117 | LEN is the length in bytes -- not relevant on the 386. */ |
118 | |
119 | #define INVALID_FLOAT(p, len) (0) |
120 | |
121 | /* code to execute to print interesting information about the |
122 | * floating point processor (if any) |
123 | * No need to define if there is nothing to do. |
124 | */ |
125 | #define FLOAT_INFO { i386_float_info (); } |
126 | |
127 | |
128 | /* Largest integer type */ |
129 | #define LONGEST long |
130 | |
131 | /* Name of the builtin type for the LONGEST type above. */ |
132 | #define BUILTIN_TYPE_LONGEST builtin_type_long |
133 | |
134 | /* Say how long (ordinary) registers are. */ |
135 | |
136 | #define REGISTER_TYPE long |
137 | |
138 | /* Number of machine registers */ |
139 | |
140 | #define NUM_REGS 16 |
141 | |
142 | /* Initializer for an array of names of registers. |
143 | There should be NUM_REGS strings in this initializer. */ |
144 | |
145 | /* the order of the first 8 registers must match the compiler's |
146 | * numbering scheme (which is the same as the 386 scheme) |
147 | * also, this table must match regmap in i386-pinsn.c. |
148 | */ |
149 | #define REGISTER_NAMES { "eax", "ecx", "edx", "ebx", \ |
150 | "esp", "ebp", "esi", "edi", \ |
151 | "eip", "ps", "cs", "ss", \ |
152 | "ds", "es", "fs", "gs", \ |
153 | } |
154 | |
155 | /* Register numbers of various important registers. |
156 | Note that some of these values are "real" register numbers, |
157 | and correspond to the general registers of the machine, |
158 | and some are "phony" register numbers which are too large |
159 | to be actual register numbers as far as the user is concerned |
160 | but do serve to get the desired values when passed to read_register. */ |
161 | |
162 | #define FP_REGNUM 5 /* Contains address of executing stack frame */ |
163 | #define SP_REGNUM 4 /* Contains address of top of stack */ |
164 | |
165 | #define PC_REGNUM 8 |
166 | #define PS_REGNUM 9 |
167 | |
168 | #define REGISTER_U_ADDR(addr, blockend, regno) \ |
169 | (addr) = i386_register_u_addr ((blockend),(regno)); |
170 | |
171 | /* Total amount of space needed to store our copies of the machine's |
172 | register state, the array `registers'. */ |
173 | #define REGISTER_BYTES (NUM_REGS * 4) |
174 | |
175 | /* Index within `registers' of the first byte of the space for |
176 | register N. */ |
177 | |
178 | #define REGISTER_BYTE(N) ((N)*4) |
179 | |
180 | /* Number of bytes of storage in the actual machine representation |
181 | for register N. */ |
182 | |
183 | #define REGISTER_RAW_SIZE(N) (4) |
184 | |
185 | /* Number of bytes of storage in the program's representation |
186 | for register N. */ |
187 | |
188 | #define REGISTER_VIRTUAL_SIZE(N) (4) |
189 | |
190 | /* Largest value REGISTER_RAW_SIZE can have. */ |
191 | |
192 | #define MAX_REGISTER_RAW_SIZE 4 |
193 | |
194 | /* Largest value REGISTER_VIRTUAL_SIZE can have. */ |
195 | |
196 | #define MAX_REGISTER_VIRTUAL_SIZE 4 |
197 | |
198 | /* Nonzero if register N requires conversion |
199 | from raw format to virtual format. */ |
200 | |
201 | #define REGISTER_CONVERTIBLE(N) (0) |
202 | |
203 | /* Convert data from raw format for register REGNUM |
204 | to virtual format for register REGNUM. */ |
205 | |
206 | #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) {bcopy ((FROM), (TO), 4);} |
207 | |
208 | /* Convert data from virtual format for register REGNUM |
209 | to raw format for register REGNUM. */ |
210 | |
211 | #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) {bcopy ((FROM), (TO), 4);} |
212 | |
213 | /* Return the GDB type object for the "standard" data type |
214 | of data in register N. */ |
215 | |
216 | #define REGISTER_VIRTUAL_TYPE(N) (builtin_type_int) |
217 | |
218 | /* Store the address of the place in which to copy the structure the |
219 | subroutine will return. This is called from call_function. */ |
220 | |
221 | #define STORE_STRUCT_RETURN(ADDR, SP) \ |
222 | { (SP) -= sizeof (ADDR); \ |
223 | write_memory ((SP), &(ADDR), sizeof (ADDR)); } |
224 | |
225 | /* Extract from an array REGBUF containing the (raw) register state |
226 | a function return value of type TYPE, and copy that, in virtual format, |
227 | into VALBUF. */ |
228 | |
229 | #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ |
230 | bcopy (REGBUF, VALBUF, TYPE_LENGTH (TYPE)) |
231 | |
232 | /* Write into appropriate registers a function return value |
233 | of type TYPE, given in virtual format. */ |
234 | |
235 | #define STORE_RETURN_VALUE(TYPE,VALBUF) \ |
236 | write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE)) |
237 | |
238 | /* Extract from an array REGBUF containing the (raw) register state |
239 | the address in which a function should return its structure value, |
240 | as a CORE_ADDR (or an expression that can be used as one). */ |
241 | |
242 | #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF)) |
243 | |
244 | \f |
245 | /* Describe the pointer in each stack frame to the previous stack frame |
246 | (its caller). */ |
247 | |
248 | /* FRAME_CHAIN takes a frame's nominal address |
249 | and produces the frame's chain-pointer. |
250 | |
251 | FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address |
252 | and produces the nominal address of the caller frame. |
253 | |
254 | However, if FRAME_CHAIN_VALID returns zero, |
255 | it means the given frame is the outermost one and has no caller. |
256 | In that case, FRAME_CHAIN_COMBINE is not used. */ |
257 | |
258 | #define FRAME_CHAIN(thisframe) (read_memory_integer ((thisframe)->frame, 4)) |
259 | |
260 | #define FRAME_CHAIN_VALID(chain, thisframe) \ |
261 | (chain != 0 && (FRAME_SAVED_PC (thisframe) >= first_object_file_end)) |
262 | |
263 | #define FRAME_CHAIN_COMBINE(chain, thisframe) (chain) |
264 | |
265 | /* Define other aspects of the stack frame. */ |
266 | |
267 | #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4)) |
268 | |
269 | #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame) |
270 | |
271 | #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame) |
272 | |
273 | /* Return number of args passed to a frame. |
274 | Can return -1, meaning no way to tell. */ |
275 | |
276 | /* on the 386, the instruction following the call could be: |
277 | * popl %ecx - one arg |
278 | * addl $imm, %esp - imm/4 args; imm may be 8 or 32 bits |
279 | * anything else - zero args |
280 | */ |
281 | #define FRAME_NUM_ARGS(numargs, fi) { \ |
282 | int retpc; \ |
283 | unsigned char op; \ |
284 | struct frame_info *pfi; \ |
285 | pfi = get_prev_frame_info ((fi)); \ |
286 | retpc = pfi->pc; \ |
287 | numargs = 0; \ |
288 | op = read_memory_integer (retpc, 1); \ |
289 | if (op == 0x59) \ |
290 | /* pop %ecx */ \ |
291 | (numargs) = 1; \ |
292 | else if (op == 0x83) { \ |
293 | op = read_memory_integer (retpc+1, 1); \ |
294 | if (op == 0xc4) \ |
295 | /* addl $<signed imm 8 bits>, %esp */ \ |
296 | (numargs) = (read_memory_integer (retpc+2,1)&0xff)/4;\ |
297 | } else if (op == 0x81) { /* add with 32 bit immediate */\ |
298 | op = read_memory_integer (retpc+1, 1); \ |
299 | if (op == 0xc4) \ |
300 | /* addl $<imm 32>, %esp */ \ |
301 | (numargs) = read_memory_integer (retpc+2, 4) / 4;\ |
302 | } \ |
303 | } |
304 | |
305 | /* Return number of bytes at start of arglist that are not really args. */ |
306 | |
307 | #define FRAME_ARGS_SKIP 8 |
308 | |
309 | /* Put here the code to store, into a struct frame_saved_regs, |
310 | the addresses of the saved registers of frame described by FRAME_INFO. |
311 | This includes special registers such as pc and fp saved in special |
312 | ways in the stack frame. sp is even more special: |
313 | the address we return for it IS the sp for the next frame. */ |
314 | |
315 | #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \ |
316 | { i386_frame_find_saved_regs ((frame_info), &(frame_saved_regs)); } |
317 | |
318 | \f |
319 | /* Things needed for making the inferior call functions. */ |
320 | |
321 | /* Push an empty stack frame, to record the current PC, etc. */ |
322 | |
323 | #define PUSH_DUMMY_FRAME { i386_push_dummy_frame (); } |
324 | |
325 | /* Discard from the stack the innermost frame, restoring all registers. */ |
326 | |
327 | #define POP_FRAME { i386_pop_frame (); } |
328 | |
329 | /* this is |
330 | * call 11223344 (32 bit relative) |
331 | * int3 |
332 | */ |
333 | |
334 | #define CALL_DUMMY { 0x223344e8, 0xcc11 } |
335 | |
336 | #define CALL_DUMMY_LENGTH 8 |
337 | |
338 | #define CALL_DUMMY_START_OFFSET 0 /* Start execution at beginning of dummy */ |
339 | |
340 | /* Insert the specified number of args and function address |
341 | into a call sequence of the above form stored at DUMMYNAME. */ |
342 | |
343 | #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, type) \ |
344 | { \ |
345 | int from, to, delta, loc; \ |
346 | loc = (int)(read_register (SP_REGNUM) - CALL_DUMMY_LENGTH); \ |
347 | from = loc + 5; \ |
348 | to = (int)(fun); \ |
349 | delta = to - from; \ |
350 | *(int *)((char *)(dummyname) + 1) = delta; \ |
351 | } |
352 | |
353 | \f |
354 | #if 0 |
355 | /* Interface definitions for kernel debugger KDB. */ |
356 | |
357 | /* Map machine fault codes into signal numbers. |
358 | First subtract 0, divide by 4, then index in a table. |
359 | Faults for which the entry in this table is 0 |
360 | are not handled by KDB; the program's own trap handler |
361 | gets to handle then. */ |
362 | |
363 | #define FAULT_CODE_ORIGIN 0 |
364 | #define FAULT_CODE_UNITS 4 |
365 | #define FAULT_TABLE \ |
366 | { 0, 0, 0, 0, 0, 0, 0, 0, \ |
367 | 0, 0, 0, 0, 0, 0, 0, 0, \ |
368 | 0, 0, 0, 0, 0, 0, 0, 0} |
369 | |
370 | /* Start running with a stack stretching from BEG to END. |
371 | BEG and END should be symbols meaningful to the assembler. |
372 | This is used only for kdb. */ |
373 | |
374 | #define INIT_STACK(beg, end) {} |
375 | |
376 | /* Push the frame pointer register on the stack. */ |
377 | #define PUSH_FRAME_PTR {} |
378 | |
379 | /* Copy the top-of-stack to the frame pointer register. */ |
380 | #define POP_FRAME_PTR {} |
381 | |
382 | /* After KDB is entered by a fault, push all registers |
383 | that GDB thinks about (all NUM_REGS of them), |
384 | so that they appear in order of ascending GDB register number. |
385 | The fault code will be on the stack beyond the last register. */ |
386 | |
387 | #define PUSH_REGISTERS {} |
388 | |
389 | /* Assuming the registers (including processor status) have been |
390 | pushed on the stack in order of ascending GDB register number, |
391 | restore them and return to the address in the saved PC register. */ |
392 | |
393 | #define POP_REGISTERS {} |
394 | #endif |