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c906108c SS |
1 | /* Macro definitions for GDB on an Intel i[345]86. |
2 | Copyright (C) 1995, 1996 Free Software Foundation, Inc. | |
3 | ||
c5aa993b | 4 | This file is part of GDB. |
c906108c | 5 | |
c5aa993b JM |
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. | |
c906108c | 10 | |
c5aa993b JM |
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. | |
c906108c | 15 | |
c5aa993b JM |
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., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
20 | |
21 | #ifndef TM_I386_H | |
22 | #define TM_I386_H 1 | |
23 | ||
c5aa993b | 24 | #ifdef __STDC__ /* Forward decl's for prototypes */ |
c906108c SS |
25 | struct frame_info; |
26 | struct frame_saved_regs; | |
27 | struct type; | |
28 | #endif | |
29 | ||
30 | #define TARGET_BYTE_ORDER LITTLE_ENDIAN | |
31 | ||
32 | /* Used for example in valprint.c:print_floating() to enable checking | |
33 | for NaN's */ | |
34 | ||
35 | #define IEEE_FLOAT | |
36 | ||
37 | /* Number of traps that happen between exec'ing the shell to run an | |
38 | inferior, and when we finally get to the inferior code. This is 2 | |
39 | on most implementations. */ | |
40 | ||
41 | #define START_INFERIOR_TRAPS_EXPECTED 2 | |
42 | ||
43 | /* Offset from address of function to start of its code. | |
44 | Zero on most machines. */ | |
45 | ||
46 | #define FUNCTION_START_OFFSET 0 | |
47 | ||
48 | /* Advance PC across any function entry prologue instructions to reach some | |
49 | "real" code. */ | |
50 | ||
b83266a0 | 51 | #define SKIP_PROLOGUE(frompc) (i386_skip_prologue (frompc)) |
c906108c SS |
52 | |
53 | extern int i386_skip_prologue PARAMS ((int)); | |
54 | ||
55 | /* Immediately after a function call, return the saved pc. Can't always go | |
56 | through the frames for this because on some machines the new frame is not | |
57 | set up until the new function executes some instructions. */ | |
58 | ||
59 | #define SAVED_PC_AFTER_CALL(frame) (read_memory_integer (read_register (SP_REGNUM), 4)) | |
60 | ||
61 | /* Stack grows downward. */ | |
62 | ||
63 | #define INNER_THAN(lhs,rhs) ((lhs) < (rhs)) | |
64 | ||
65 | /* Sequence of bytes for breakpoint instruction. */ | |
66 | ||
67 | #define BREAKPOINT {0xcc} | |
68 | ||
69 | /* Amount PC must be decremented by after a breakpoint. This is often the | |
70 | number of bytes in BREAKPOINT but not always. */ | |
71 | ||
72 | #define DECR_PC_AFTER_BREAK 1 | |
73 | ||
74 | /* Say how long (ordinary) registers are. This is a piece of bogosity | |
75 | used in push_word and a few other places; REGISTER_RAW_SIZE is the | |
76 | real way to know how big a register is. */ | |
77 | ||
78 | #define REGISTER_SIZE 4 | |
79 | ||
80 | /* Number of machine registers */ | |
81 | ||
c5aa993b | 82 | #define NUM_FREGS 0 /*8*/ /* Number of FP regs */ |
c906108c SS |
83 | #define NUM_REGS (16 + NUM_FREGS) /* Basic i*86 regs + FP regs */ |
84 | ||
85 | /* Initializer for an array of names of registers. There should be at least | |
86 | NUM_REGS strings in this initializer. Any excess ones are simply ignored. | |
87 | The order of the first 8 registers must match the compiler's numbering | |
88 | scheme (which is the same as the 386 scheme) and also regmap in the various | |
89 | *-nat.c files. */ | |
90 | ||
91 | #define REGISTER_NAMES { "eax", "ecx", "edx", "ebx", \ | |
92 | "esp", "ebp", "esi", "edi", \ | |
93 | "eip", "eflags", "cs", "ss", \ | |
94 | "ds", "es", "fs", "gs", \ | |
95 | "st0", "st1", "st2", "st3", \ | |
96 | "st4", "st5", "st6", "st7", \ | |
97 | } | |
98 | ||
99 | /* Register numbers of various important registers. | |
100 | Note that some of these values are "real" register numbers, | |
101 | and correspond to the general registers of the machine, | |
102 | and some are "phony" register numbers which are too large | |
103 | to be actual register numbers as far as the user is concerned | |
104 | but do serve to get the desired values when passed to read_register. */ | |
105 | ||
c5aa993b JM |
106 | #define FP_REGNUM 5 /* (ebp) Contains address of executing stack frame */ |
107 | #define SP_REGNUM 4 /* (usp) Contains address of top of stack */ | |
108 | #define PC_REGNUM 8 /* (eip) Contains program counter */ | |
109 | #define PS_REGNUM 9 /* (ps) Contains processor status */ | |
c906108c | 110 | |
c5aa993b JM |
111 | #define FP0_REGNUM 16 /* (st0) 387 register */ |
112 | #define FPC_REGNUM 25 /* 80387 control register */ | |
c906108c SS |
113 | |
114 | /* Total amount of space needed to store our copies of the machine's register | |
115 | state, the array `registers'. */ | |
116 | ||
117 | #define REGISTER_BYTES ((NUM_REGS - NUM_FREGS)*4 + NUM_FREGS*10) | |
118 | ||
119 | /* Index within `registers' of the first byte of the space for register N. */ | |
120 | ||
121 | #define REGISTER_BYTE(N) \ | |
122 | (((N) < FP0_REGNUM) ? ((N) * 4) : ((((N) - FP0_REGNUM) * 10) + 64)) | |
c5aa993b | 123 | |
c906108c SS |
124 | /* Number of bytes of storage in the actual machine representation for |
125 | register N. All registers are 4 bytes, except 387 st(0) - st(7), | |
126 | which are 80 bits each. */ | |
127 | ||
128 | #define REGISTER_RAW_SIZE(N) (((N) < FP0_REGNUM) ? 4 : 10) | |
129 | ||
130 | /* Largest value REGISTER_RAW_SIZE can have. */ | |
131 | ||
132 | #define MAX_REGISTER_RAW_SIZE 10 | |
133 | ||
134 | /* Number of bytes of storage in the program's representation | |
135 | for register N. */ | |
136 | ||
137 | #define REGISTER_VIRTUAL_SIZE(N) (((N) < FP0_REGNUM) ? 4 : 8) | |
138 | ||
139 | /* Largest value REGISTER_VIRTUAL_SIZE can have. */ | |
140 | ||
141 | #define MAX_REGISTER_VIRTUAL_SIZE 8 | |
142 | ||
143 | /* Return the GDB type object for the "standard" data type of data in | |
144 | register N. Perhaps si and di should go here, but potentially they | |
145 | could be used for things other than address. */ | |
146 | ||
147 | #define REGISTER_VIRTUAL_TYPE(N) \ | |
148 | (((N) == PC_REGNUM || (N) == FP_REGNUM || (N) == SP_REGNUM) \ | |
149 | ? lookup_pointer_type (builtin_type_void) \ | |
150 | : (((N) < FP0_REGNUM) \ | |
151 | ? builtin_type_int \ | |
152 | : builtin_type_double)) | |
153 | ||
154 | /* Store the address of the place in which to copy the structure the | |
155 | subroutine will return. This is called from call_function. */ | |
156 | ||
157 | #define STORE_STRUCT_RETURN(ADDR, SP) \ | |
158 | { char buf[REGISTER_SIZE]; \ | |
159 | (SP) -= sizeof (ADDR); \ | |
160 | store_address (buf, sizeof (ADDR), ADDR); \ | |
161 | write_memory ((SP), buf, sizeof (ADDR)); } | |
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. */ | |
166 | ||
167 | #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ | |
168 | i386_extract_return_value ((TYPE),(REGBUF),(VALBUF)) | |
169 | ||
c5aa993b | 170 | extern void i386_extract_return_value PARAMS ((struct type *, char[], char *)); |
c906108c SS |
171 | |
172 | /* Write into appropriate registers a function return value of type TYPE, given | |
173 | in virtual format. */ | |
174 | ||
175 | #define STORE_RETURN_VALUE(TYPE,VALBUF) \ | |
176 | { \ | |
177 | if (TYPE_CODE (TYPE) == TYPE_CODE_FLT) \ | |
178 | write_register_bytes (REGISTER_BYTE (FP0_REGNUM), (VALBUF), \ | |
179 | TYPE_LENGTH (TYPE)); \ | |
180 | else \ | |
181 | write_register_bytes (0, (VALBUF), TYPE_LENGTH (TYPE)); \ | |
182 | } | |
183 | ||
184 | /* Extract from an array REGBUF containing the (raw) register state the address | |
185 | in which a function should return its structure value, as a CORE_ADDR (or an | |
186 | expression that can be used as one). */ | |
187 | ||
188 | #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF)) | |
189 | ||
190 | /* The following redefines make backtracing through sigtramp work. | |
191 | They manufacture a fake sigtramp frame and obtain the saved pc in sigtramp | |
192 | from the sigcontext structure which is pushed by the kernel on the | |
193 | user stack, along with a pointer to it. */ | |
194 | ||
195 | /* FRAME_CHAIN takes a frame's nominal address and produces the frame's | |
196 | chain-pointer. | |
197 | In the case of the i386, the frame's nominal address | |
198 | is the address of a 4-byte word containing the calling frame's address. */ | |
199 | ||
200 | #define FRAME_CHAIN(thisframe) \ | |
201 | ((thisframe)->signal_handler_caller \ | |
202 | ? (thisframe)->frame \ | |
203 | : (!inside_entry_file ((thisframe)->pc) \ | |
204 | ? read_memory_integer ((thisframe)->frame, 4) \ | |
205 | : 0)) | |
206 | ||
207 | /* A macro that tells us whether the function invocation represented | |
208 | by FI does not have a frame on the stack associated with it. If it | |
209 | does not, FRAMELESS is set to 1, else 0. */ | |
210 | ||
392a587b JM |
211 | #define FRAMELESS_FUNCTION_INVOCATION(FI) \ |
212 | (((FI)->signal_handler_caller) ? 0 : frameless_look_for_prologue(FI)) | |
c906108c SS |
213 | |
214 | /* Saved Pc. Get it from sigcontext if within sigtramp. */ | |
215 | ||
216 | #define FRAME_SAVED_PC(FRAME) \ | |
217 | (((FRAME)->signal_handler_caller \ | |
218 | ? sigtramp_saved_pc (FRAME) \ | |
219 | : read_memory_integer ((FRAME)->frame + 4, 4)) \ | |
220 | ) | |
221 | ||
222 | extern CORE_ADDR sigtramp_saved_pc PARAMS ((struct frame_info *)); | |
223 | ||
224 | #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame) | |
225 | ||
226 | #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame) | |
227 | ||
228 | /* Return number of args passed to a frame. Can return -1, meaning no way | |
229 | to tell, which is typical now that the C compiler delays popping them. */ | |
230 | ||
392a587b | 231 | #define FRAME_NUM_ARGS(fi) (i386_frame_num_args(fi)) |
c906108c SS |
232 | |
233 | extern int i386_frame_num_args PARAMS ((struct frame_info *)); | |
234 | ||
235 | /* Return number of bytes at start of arglist that are not really args. */ | |
236 | ||
237 | #define FRAME_ARGS_SKIP 8 | |
238 | ||
239 | /* Put here the code to store, into a struct frame_saved_regs, | |
240 | the addresses of the saved registers of frame described by FRAME_INFO. | |
241 | This includes special registers such as pc and fp saved in special | |
242 | ways in the stack frame. sp is even more special: | |
243 | the address we return for it IS the sp for the next frame. */ | |
244 | ||
245 | #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \ | |
246 | { i386_frame_find_saved_regs ((frame_info), &(frame_saved_regs)); } | |
247 | ||
248 | extern void i386_frame_find_saved_regs PARAMS ((struct frame_info *, | |
249 | struct frame_saved_regs *)); | |
c906108c | 250 | \f |
c5aa993b | 251 | |
c906108c SS |
252 | /* Things needed for making the inferior call functions. */ |
253 | ||
254 | /* Push an empty stack frame, to record the current PC, etc. */ | |
255 | ||
256 | #define PUSH_DUMMY_FRAME { i386_push_dummy_frame (); } | |
257 | ||
258 | extern void i386_push_dummy_frame PARAMS ((void)); | |
259 | ||
260 | /* Discard from the stack the innermost frame, restoring all registers. */ | |
261 | ||
262 | #define POP_FRAME { i386_pop_frame (); } | |
263 | ||
264 | extern void i386_pop_frame PARAMS ((void)); | |
c906108c | 265 | \f |
c5aa993b | 266 | |
c906108c SS |
267 | /* this is |
268 | * call 11223344 (32 bit relative) | |
269 | * int3 | |
270 | */ | |
271 | ||
272 | #define CALL_DUMMY { 0x223344e8, 0xcc11 } | |
273 | ||
274 | #define CALL_DUMMY_LENGTH 8 | |
275 | ||
c5aa993b | 276 | #define CALL_DUMMY_START_OFFSET 0 /* Start execution at beginning of dummy */ |
c906108c SS |
277 | |
278 | #define CALL_DUMMY_BREAKPOINT_OFFSET 5 | |
279 | ||
280 | /* Insert the specified number of args and function address | |
281 | into a call sequence of the above form stored at DUMMYNAME. */ | |
282 | ||
283 | #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \ | |
284 | { \ | |
285 | int from, to, delta, loc; \ | |
286 | loc = (int)(read_register (SP_REGNUM) - CALL_DUMMY_LENGTH); \ | |
287 | from = loc + 5; \ | |
288 | to = (int)(fun); \ | |
289 | delta = to - from; \ | |
290 | *((char *)(dummyname) + 1) = (delta & 0xff); \ | |
291 | *((char *)(dummyname) + 2) = ((delta >> 8) & 0xff); \ | |
292 | *((char *)(dummyname) + 3) = ((delta >> 16) & 0xff); \ | |
293 | *((char *)(dummyname) + 4) = ((delta >> 24) & 0xff); \ | |
294 | } | |
295 | ||
296 | extern void print_387_control_word PARAMS ((unsigned int)); | |
297 | extern void print_387_status_word PARAMS ((unsigned int)); | |
298 | ||
299 | /* Offset from SP to first arg on stack at first instruction of a function */ | |
300 | ||
301 | #define SP_ARG0 (1 * 4) | |
302 | ||
303 | #endif /* ifndef TM_I386_H */ |