Commit | Line | Data |
---|---|---|
c906108c SS |
1 | /* Macro definitions for GDB on an Intel i[345]86. |
2 | Copyright (C) 1995, 1996 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 | |
7a292a7a | 18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
c906108c SS |
19 | |
20 | #ifndef TM_I386_H | |
21 | #define TM_I386_H 1 | |
22 | ||
23 | #ifdef __STDC__ /* Forward decl's for prototypes */ | |
24 | struct frame_info; | |
25 | struct frame_saved_regs; | |
26 | struct type; | |
27 | #endif | |
28 | ||
29 | #define TARGET_BYTE_ORDER LITTLE_ENDIAN | |
30 | ||
31 | /* Used for example in valprint.c:print_floating() to enable checking | |
32 | for NaN's */ | |
33 | ||
34 | #define IEEE_FLOAT | |
35 | ||
36 | /* Number of traps that happen between exec'ing the shell to run an | |
37 | inferior, and when we finally get to the inferior code. This is 2 | |
38 | on most implementations. */ | |
39 | ||
40 | #define START_INFERIOR_TRAPS_EXPECTED 2 | |
41 | ||
42 | /* Offset from address of function to start of its code. | |
43 | Zero on most machines. */ | |
44 | ||
45 | #define FUNCTION_START_OFFSET 0 | |
46 | ||
47 | /* Advance PC across any function entry prologue instructions to reach some | |
48 | "real" code. */ | |
49 | ||
50 | #define SKIP_PROLOGUE(frompc) {(frompc) = i386_skip_prologue((frompc));} | |
51 | ||
52 | extern int i386_skip_prologue PARAMS ((int)); | |
53 | ||
54 | /* Immediately after a function call, return the saved pc. Can't always go | |
55 | through the frames for this because on some machines the new frame is not | |
56 | set up until the new function executes some instructions. */ | |
57 | ||
58 | #define SAVED_PC_AFTER_CALL(frame) (read_memory_integer (read_register (SP_REGNUM), 4)) | |
59 | ||
60 | /* Stack grows downward. */ | |
61 | ||
62 | #define INNER_THAN(lhs,rhs) ((lhs) < (rhs)) | |
63 | ||
64 | /* Sequence of bytes for breakpoint instruction. */ | |
65 | ||
66 | #define BREAKPOINT {0xcc} | |
67 | ||
68 | /* Amount PC must be decremented by after a breakpoint. This is often the | |
69 | number of bytes in BREAKPOINT but not always. */ | |
70 | ||
71 | #define DECR_PC_AFTER_BREAK 1 | |
72 | ||
73 | /* Say how long (ordinary) registers are. This is a piece of bogosity | |
74 | used in push_word and a few other places; REGISTER_RAW_SIZE is the | |
75 | real way to know how big a register is. */ | |
76 | ||
77 | #define REGISTER_SIZE 4 | |
78 | ||
79 | /* Number of machine registers */ | |
80 | ||
81 | #define NUM_FREGS 0 /*8*/ /* Number of FP regs */ | |
82 | #define NUM_REGS (16 + NUM_FREGS) /* Basic i*86 regs + FP regs */ | |
83 | ||
84 | /* Initializer for an array of names of registers. There should be at least | |
85 | NUM_REGS strings in this initializer. Any excess ones are simply ignored. | |
86 | The order of the first 8 registers must match the compiler's numbering | |
87 | scheme (which is the same as the 386 scheme) and also regmap in the various | |
88 | *-nat.c files. */ | |
89 | ||
90 | #define REGISTER_NAMES { "eax", "ecx", "edx", "ebx", \ | |
91 | "esp", "ebp", "esi", "edi", \ | |
92 | "eip", "eflags", "cs", "ss", \ | |
93 | "ds", "es", "fs", "gs", \ | |
94 | "st0", "st1", "st2", "st3", \ | |
95 | "st4", "st5", "st6", "st7", \ | |
96 | } | |
97 | ||
98 | /* Register numbers of various important registers. | |
99 | Note that some of these values are "real" register numbers, | |
100 | and correspond to the general registers of the machine, | |
101 | and some are "phony" register numbers which are too large | |
102 | to be actual register numbers as far as the user is concerned | |
103 | but do serve to get the desired values when passed to read_register. */ | |
104 | ||
105 | #define FP_REGNUM 5 /* (ebp) Contains address of executing stack frame */ | |
106 | #define SP_REGNUM 4 /* (usp) Contains address of top of stack */ | |
107 | #define PC_REGNUM 8 /* (eip) Contains program counter */ | |
108 | #define PS_REGNUM 9 /* (ps) Contains processor status */ | |
109 | ||
110 | #define FP0_REGNUM 16 /* (st0) 387 register */ | |
111 | #define FPC_REGNUM 25 /* 80387 control register */ | |
112 | ||
113 | /* Total amount of space needed to store our copies of the machine's register | |
114 | state, the array `registers'. */ | |
115 | ||
116 | #define REGISTER_BYTES ((NUM_REGS - NUM_FREGS)*4 + NUM_FREGS*10) | |
117 | ||
118 | /* Index within `registers' of the first byte of the space for register N. */ | |
119 | ||
120 | #define REGISTER_BYTE(N) \ | |
121 | (((N) < FP0_REGNUM) ? ((N) * 4) : ((((N) - FP0_REGNUM) * 10) + 64)) | |
122 | ||
123 | /* Number of bytes of storage in the actual machine representation for | |
124 | register N. All registers are 4 bytes, except 387 st(0) - st(7), | |
125 | which are 80 bits each. */ | |
126 | ||
127 | #define REGISTER_RAW_SIZE(N) (((N) < FP0_REGNUM) ? 4 : 10) | |
128 | ||
129 | /* Largest value REGISTER_RAW_SIZE can have. */ | |
130 | ||
131 | #define MAX_REGISTER_RAW_SIZE 10 | |
132 | ||
133 | /* Number of bytes of storage in the program's representation | |
134 | for register N. */ | |
135 | ||
136 | #define REGISTER_VIRTUAL_SIZE(N) (((N) < FP0_REGNUM) ? 4 : 8) | |
137 | ||
138 | /* Largest value REGISTER_VIRTUAL_SIZE can have. */ | |
139 | ||
140 | #define MAX_REGISTER_VIRTUAL_SIZE 8 | |
141 | ||
142 | /* Return the GDB type object for the "standard" data type of data in | |
143 | register N. Perhaps si and di should go here, but potentially they | |
144 | could be used for things other than address. */ | |
145 | ||
146 | #define REGISTER_VIRTUAL_TYPE(N) \ | |
147 | (((N) == PC_REGNUM || (N) == FP_REGNUM || (N) == SP_REGNUM) \ | |
148 | ? lookup_pointer_type (builtin_type_void) \ | |
149 | : (((N) < FP0_REGNUM) \ | |
150 | ? builtin_type_int \ | |
151 | : builtin_type_double)) | |
152 | ||
153 | /* Store the address of the place in which to copy the structure the | |
154 | subroutine will return. This is called from call_function. */ | |
155 | ||
156 | #define STORE_STRUCT_RETURN(ADDR, SP) \ | |
157 | { char buf[REGISTER_SIZE]; \ | |
158 | (SP) -= sizeof (ADDR); \ | |
159 | store_address (buf, sizeof (ADDR), ADDR); \ | |
160 | write_memory ((SP), buf, sizeof (ADDR)); } | |
161 | ||
162 | /* Extract from an array REGBUF containing the (raw) register state | |
163 | a function return value of type TYPE, and copy that, in virtual format, | |
164 | into VALBUF. */ | |
165 | ||
166 | #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ | |
167 | i386_extract_return_value ((TYPE),(REGBUF),(VALBUF)) | |
168 | ||
169 | extern void i386_extract_return_value PARAMS ((struct type *, char [], char *)); | |
170 | ||
171 | /* Write into appropriate registers a function return value of type TYPE, given | |
172 | in virtual format. */ | |
173 | ||
174 | #define STORE_RETURN_VALUE(TYPE,VALBUF) \ | |
175 | { \ | |
176 | if (TYPE_CODE (TYPE) == TYPE_CODE_FLT) \ | |
177 | write_register_bytes (REGISTER_BYTE (FP0_REGNUM), (VALBUF), \ | |
178 | TYPE_LENGTH (TYPE)); \ | |
179 | else \ | |
180 | write_register_bytes (0, (VALBUF), TYPE_LENGTH (TYPE)); \ | |
181 | } | |
182 | ||
183 | /* Extract from an array REGBUF containing the (raw) register state the address | |
184 | in which a function should return its structure value, as a CORE_ADDR (or an | |
185 | expression that can be used as one). */ | |
186 | ||
187 | #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF)) | |
188 | ||
189 | /* The following redefines make backtracing through sigtramp work. | |
190 | They manufacture a fake sigtramp frame and obtain the saved pc in sigtramp | |
191 | from the sigcontext structure which is pushed by the kernel on the | |
192 | user stack, along with a pointer to it. */ | |
193 | ||
194 | /* FRAME_CHAIN takes a frame's nominal address and produces the frame's | |
195 | chain-pointer. | |
196 | In the case of the i386, the frame's nominal address | |
197 | is the address of a 4-byte word containing the calling frame's address. */ | |
198 | ||
199 | #define FRAME_CHAIN(thisframe) \ | |
200 | ((thisframe)->signal_handler_caller \ | |
201 | ? (thisframe)->frame \ | |
202 | : (!inside_entry_file ((thisframe)->pc) \ | |
203 | ? read_memory_integer ((thisframe)->frame, 4) \ | |
204 | : 0)) | |
205 | ||
206 | /* A macro that tells us whether the function invocation represented | |
207 | by FI does not have a frame on the stack associated with it. If it | |
208 | does not, FRAMELESS is set to 1, else 0. */ | |
209 | ||
210 | #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \ | |
211 | do { \ | |
212 | if ((FI)->signal_handler_caller) \ | |
213 | (FRAMELESS) = 0; \ | |
214 | else \ | |
215 | (FRAMELESS) = frameless_look_for_prologue(FI); \ | |
216 | } while (0) | |
217 | ||
218 | /* Saved Pc. Get it from sigcontext if within sigtramp. */ | |
219 | ||
220 | #define FRAME_SAVED_PC(FRAME) \ | |
221 | (((FRAME)->signal_handler_caller \ | |
222 | ? sigtramp_saved_pc (FRAME) \ | |
223 | : read_memory_integer ((FRAME)->frame + 4, 4)) \ | |
224 | ) | |
225 | ||
226 | extern CORE_ADDR sigtramp_saved_pc PARAMS ((struct frame_info *)); | |
227 | ||
228 | #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame) | |
229 | ||
230 | #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame) | |
231 | ||
232 | /* Return number of args passed to a frame. Can return -1, meaning no way | |
233 | to tell, which is typical now that the C compiler delays popping them. */ | |
234 | ||
235 | #define FRAME_NUM_ARGS(numargs, fi) (numargs) = i386_frame_num_args(fi) | |
236 | ||
237 | extern int i386_frame_num_args PARAMS ((struct frame_info *)); | |
238 | ||
239 | /* Return number of bytes at start of arglist that are not really args. */ | |
240 | ||
241 | #define FRAME_ARGS_SKIP 8 | |
242 | ||
243 | /* Put here the code to store, into a struct frame_saved_regs, | |
244 | the addresses of the saved registers of frame described by FRAME_INFO. | |
245 | This includes special registers such as pc and fp saved in special | |
246 | ways in the stack frame. sp is even more special: | |
247 | the address we return for it IS the sp for the next frame. */ | |
248 | ||
249 | #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \ | |
250 | { i386_frame_find_saved_regs ((frame_info), &(frame_saved_regs)); } | |
251 | ||
252 | extern void i386_frame_find_saved_regs PARAMS ((struct frame_info *, | |
253 | struct frame_saved_regs *)); | |
254 | ||
255 | \f | |
256 | /* Things needed for making the inferior call functions. */ | |
257 | ||
258 | /* Push an empty stack frame, to record the current PC, etc. */ | |
259 | ||
260 | #define PUSH_DUMMY_FRAME { i386_push_dummy_frame (); } | |
261 | ||
262 | extern void i386_push_dummy_frame PARAMS ((void)); | |
263 | ||
264 | /* Discard from the stack the innermost frame, restoring all registers. */ | |
265 | ||
266 | #define POP_FRAME { i386_pop_frame (); } | |
267 | ||
268 | extern void i386_pop_frame PARAMS ((void)); | |
269 | ||
270 | \f | |
271 | /* this is | |
272 | * call 11223344 (32 bit relative) | |
273 | * int3 | |
274 | */ | |
275 | ||
276 | #define CALL_DUMMY { 0x223344e8, 0xcc11 } | |
277 | ||
278 | #define CALL_DUMMY_LENGTH 8 | |
279 | ||
280 | #define CALL_DUMMY_START_OFFSET 0 /* Start execution at beginning of dummy */ | |
281 | ||
282 | #define CALL_DUMMY_BREAKPOINT_OFFSET 5 | |
283 | ||
284 | /* Insert the specified number of args and function address | |
285 | into a call sequence of the above form stored at DUMMYNAME. */ | |
286 | ||
287 | #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \ | |
288 | { \ | |
289 | int from, to, delta, loc; \ | |
290 | loc = (int)(read_register (SP_REGNUM) - CALL_DUMMY_LENGTH); \ | |
291 | from = loc + 5; \ | |
292 | to = (int)(fun); \ | |
293 | delta = to - from; \ | |
294 | *((char *)(dummyname) + 1) = (delta & 0xff); \ | |
295 | *((char *)(dummyname) + 2) = ((delta >> 8) & 0xff); \ | |
296 | *((char *)(dummyname) + 3) = ((delta >> 16) & 0xff); \ | |
297 | *((char *)(dummyname) + 4) = ((delta >> 24) & 0xff); \ | |
298 | } | |
299 | ||
300 | extern void print_387_control_word PARAMS ((unsigned int)); | |
301 | extern void print_387_status_word PARAMS ((unsigned int)); | |
302 | ||
303 | /* Offset from SP to first arg on stack at first instruction of a function */ | |
304 | ||
305 | #define SP_ARG0 (1 * 4) | |
306 | ||
307 | #endif /* ifndef TM_I386_H */ |