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5076de82 FF |
1 | /* Parameters for a Sun 386i target machine, for GDB, the GNU debugger. |
2 | Copyright 1986, 1987, 1991, 1992, 1993 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 | #define TARGET_BYTE_ORDER LITTLE_ENDIAN | |
21 | ||
22 | #ifndef sun386 | |
23 | #define sun386 | |
24 | #endif | |
25 | #define GDB_TARGET_IS_SUN386 1 | |
26 | #define SUNOS4 | |
27 | #define USE_MACHINE_REG_H | |
28 | ||
29 | /* Perhaps some day this will work even without the following #define */ | |
30 | #define COFF_ENCAPSULATE | |
31 | ||
32 | #ifdef COFF_ENCAPSULATE | |
33 | /* Avoid conflicts between our include files and <sys/exec.h> | |
34 | (maybe not needed anymore). */ | |
35 | #define _EXEC_ | |
36 | #endif | |
37 | ||
38 | /* sun386 ptrace seems unable to change the frame pointer */ | |
39 | #define PTRACE_FP_BUG | |
40 | ||
41 | /* Offset from address of function to start of its code. | |
42 | Zero on most machines. */ | |
43 | ||
44 | #define FUNCTION_START_OFFSET 0 | |
45 | ||
46 | /* Advance PC across any function entry prologue instructions | |
47 | to reach some "real" code. */ | |
48 | ||
49 | #define SKIP_PROLOGUE(frompc) {(frompc) = i386_skip_prologue((frompc));} | |
50 | ||
51 | extern int | |
52 | i386_skip_prologue PARAMS ((int)); | |
53 | ||
54 | /* Immediately after a function call, return the saved pc. | |
55 | Can't always go through the frames for this because on some machines | |
56 | the new frame is not set up until the new function executes | |
57 | some instructions. */ | |
58 | ||
59 | #define SAVED_PC_AFTER_CALL(frame) \ | |
60 | (read_memory_integer (read_register (SP_REGNUM), 4)) | |
61 | ||
62 | /* Address of end of stack space. */ | |
63 | ||
64 | #define STACK_END_ADDR 0xfc000000 | |
65 | ||
66 | /* Stack grows downward. */ | |
67 | ||
68 | #define INNER_THAN < | |
69 | ||
70 | /* Sequence of bytes for breakpoint instruction. */ | |
71 | ||
72 | #define BREAKPOINT {0xcc} | |
73 | ||
74 | /* Amount PC must be decremented by after a breakpoint. | |
75 | This is often the number of bytes in BREAKPOINT | |
76 | but not always. */ | |
77 | ||
78 | #define DECR_PC_AFTER_BREAK 1 | |
79 | ||
80 | /* Nonzero if instruction at PC is a return instruction. */ | |
81 | ||
82 | #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 1) == 0xc3) | |
83 | ||
84 | /* Return 1 if P points to an invalid floating point value. | |
85 | LEN is the length in bytes -- not relevant on the 386. */ | |
86 | ||
87 | #define INVALID_FLOAT(p, len) (0) | |
88 | ||
f4f0d174 JK |
89 | /* Say how long (ordinary) registers are. This is a piece of bogosity |
90 | used in push_word and a few other places; REGISTER_RAW_SIZE is the | |
91 | real way to know how big a register is. */ | |
5076de82 | 92 | |
f4f0d174 | 93 | #define REGISTER_SIZE 4 |
5076de82 FF |
94 | |
95 | /* Number of machine registers */ | |
96 | ||
97 | #define NUM_REGS 35 | |
98 | ||
99 | /* Initializer for an array of names of registers. | |
100 | There should be NUM_REGS strings in this initializer. */ | |
101 | ||
102 | /* the order of the first 8 registers must match the compiler's | |
103 | * numbering scheme (which is the same as the 386 scheme) | |
104 | * also, this table must match regmap in i386-pinsn.c. | |
105 | */ | |
106 | #define REGISTER_NAMES { "gs", "fs", "es", "ds", \ | |
107 | "edi", "esi", "ebp", "esp", \ | |
108 | "ebx", "edx", "ecx", "eax", \ | |
109 | "retaddr", "trapnum", "errcode", "ip", \ | |
110 | "cs", "ps", "sp", "ss", \ | |
111 | "fst0", "fst1", "fst2", "fst3", \ | |
112 | "fst4", "fst5", "fst6", "fst7", \ | |
113 | "fctrl", "fstat", "ftag", "fip", \ | |
114 | "fcs", "fopoff", "fopsel" \ | |
115 | } | |
116 | ||
117 | /* Register numbers of various important registers. | |
118 | Note that some of these values are "real" register numbers, | |
119 | and correspond to the general registers of the machine, | |
120 | and some are "phony" register numbers which are too large | |
121 | to be actual register numbers as far as the user is concerned | |
122 | but do serve to get the desired values when passed to read_register. */ | |
123 | ||
124 | #define FP_REGNUM 6 /* Contains address of executing stack frame */ | |
125 | #define SP_REGNUM 18 /* Contains address of top of stack */ | |
126 | #define PS_REGNUM 17 /* Contains processor status */ | |
127 | #define PC_REGNUM 15 /* Contains program counter */ | |
128 | #define FP0_REGNUM 20 /* Floating point register 0 */ | |
129 | #define FPC_REGNUM 28 /* 80387 control register */ | |
130 | ||
131 | /* Total amount of space needed to store our copies of the machine's | |
132 | register state, the array `registers'. */ | |
133 | #define REGISTER_BYTES (20*4+8*10+7*4) | |
134 | ||
135 | /* Index within `registers' of the first byte of the space for | |
136 | register N. */ | |
137 | ||
138 | #define REGISTER_BYTE(N) \ | |
139 | ((N) >= FPC_REGNUM ? (((N) - FPC_REGNUM) * 4) + 160 \ | |
140 | : (N) >= FP0_REGNUM ? (((N) - FP0_REGNUM) * 10) + 80 \ | |
141 | : (N) * 4) | |
142 | ||
143 | /* Number of bytes of storage in the actual machine representation | |
144 | for register N. */ | |
145 | ||
146 | #define REGISTER_RAW_SIZE(N) (((unsigned)((N) - FP0_REGNUM)) < 8 ? 10 : 4) | |
147 | ||
148 | /* Number of bytes of storage in the program's representation | |
149 | for register N. */ | |
150 | ||
151 | #define REGISTER_VIRTUAL_SIZE(N) (((unsigned)((N) - FP0_REGNUM)) < 8 ? 8 : 4) | |
152 | ||
153 | /* Largest value REGISTER_RAW_SIZE can have. */ | |
154 | ||
155 | #define MAX_REGISTER_RAW_SIZE 10 | |
156 | ||
157 | /* Largest value REGISTER_VIRTUAL_SIZE can have. */ | |
158 | ||
159 | #define MAX_REGISTER_VIRTUAL_SIZE 8 | |
160 | ||
161 | /* Nonzero if register N requires conversion | |
162 | from raw format to virtual format. */ | |
163 | ||
164 | #define REGISTER_CONVERTIBLE(N) (((unsigned)((N) - FP0_REGNUM)) < 8) | |
165 | ||
ad09cb2b PS |
166 | /* Convert data from raw format for register REGNUM in buffer FROM |
167 | to virtual format with type TYPE in buffer TO. */ | |
168 | ||
169 | #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,TYPE,FROM,TO) \ | |
170 | { \ | |
171 | double val; \ | |
172 | i387_to_double ((FROM), (char *)&val); \ | |
173 | store_floating ((TO), TYPE_LENGTH (TYPE), val); \ | |
174 | } | |
5076de82 FF |
175 | extern void |
176 | i387_to_double PARAMS ((char *, char *)); | |
177 | ||
ad09cb2b PS |
178 | /* Convert data from virtual format with type TYPE in buffer FROM |
179 | to raw format for register REGNUM in buffer TO. */ | |
5076de82 | 180 | |
ad09cb2b PS |
181 | #define REGISTER_CONVERT_TO_RAW(TYPE,REGNUM,FROM,TO) \ |
182 | { \ | |
183 | double val = extract_floating ((FROM), TYPE_LENGTH (TYPE)); \ | |
57a9fee3 | 184 | double_to_i387((char *)&val, (TO))) \ |
ad09cb2b | 185 | } |
5076de82 FF |
186 | extern void |
187 | double_to_i387 PARAMS ((char *, char *)); | |
188 | ||
189 | /* Return the GDB type object for the "standard" data type | |
190 | of data in register N. */ | |
191 | ||
192 | #define REGISTER_VIRTUAL_TYPE(N) \ | |
193 | (((unsigned)((N) - FP0_REGNUM)) < 8 ? builtin_type_double : builtin_type_int) | |
194 | ||
195 | /* Store the address of the place in which to copy the structure the | |
196 | subroutine will return. This is called from call_function. */ | |
197 | ||
198 | #define STORE_STRUCT_RETURN(ADDR, SP) \ | |
199 | { (SP) -= sizeof (ADDR); \ | |
200 | write_memory ((SP), &(ADDR), sizeof (ADDR)); } | |
201 | ||
202 | /* Extract from an array REGBUF containing the (raw) register state | |
203 | a function return value of type TYPE, and copy that, in virtual format, | |
204 | into VALBUF. */ | |
205 | ||
206 | #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ | |
ade40d31 | 207 | memcpy (VALBUF, REGBUF + REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 11), TYPE_LENGTH (TYPE)) |
5076de82 FF |
208 | |
209 | /* Write into appropriate registers a function return value | |
210 | of type TYPE, given in virtual format. */ | |
211 | ||
212 | #define STORE_RETURN_VALUE(TYPE,VALBUF) \ | |
213 | write_register_bytes (REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 11), VALBUF, TYPE_LENGTH (TYPE)) | |
214 | ||
215 | /* Extract from an array REGBUF containing the (raw) register state | |
216 | the address in which a function should return its structure value, | |
217 | as a CORE_ADDR (or an expression that can be used as one). */ | |
218 | ||
219 | #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF)) | |
220 | \f | |
221 | /* Describe the pointer in each stack frame to the previous stack frame | |
222 | (its caller). */ | |
223 | ||
224 | /* FRAME_CHAIN takes a frame's nominal address | |
225 | and produces the frame's chain-pointer. */ | |
226 | ||
227 | #define FRAME_CHAIN(thisframe) \ | |
228 | (!inside_entry_file ((thisframe)->pc) ? \ | |
229 | read_memory_integer ((thisframe)->frame, 4) :\ | |
230 | 0) | |
231 | ||
232 | /* Define other aspects of the stack frame. */ | |
233 | ||
234 | /* A macro that tells us whether the function invocation represented | |
235 | by FI does not have a frame on the stack associated with it. If it | |
236 | does not, FRAMELESS is set to 1, else 0. */ | |
237 | #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \ | |
238 | { (FRAMELESS) = frameless_look_for_prologue (FI); } | |
239 | ||
240 | #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4)) | |
241 | ||
242 | #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame) | |
243 | ||
244 | #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame) | |
245 | ||
246 | /* Return number of args passed to a frame. | |
247 | Can return -1, meaning no way to tell. */ | |
248 | ||
249 | #define FRAME_NUM_ARGS(numargs, fi) (numargs) = i386_frame_num_args(fi) | |
250 | ||
251 | #ifdef __STDC__ /* Forward decl's for prototypes */ | |
252 | struct frame_info; | |
253 | struct frame_saved_regs; | |
254 | #endif | |
255 | ||
256 | extern int | |
257 | i386_frame_num_args PARAMS ((struct frame_info *)); | |
258 | ||
259 | /* Return number of bytes at start of arglist that are not really args. */ | |
260 | ||
261 | #define FRAME_ARGS_SKIP 8 | |
262 | ||
263 | /* Put here the code to store, into a struct frame_saved_regs, | |
264 | the addresses of the saved registers of frame described by FRAME_INFO. | |
265 | This includes special registers such as pc and fp saved in special | |
266 | ways in the stack frame. sp is even more special: | |
267 | the address we return for it IS the sp for the next frame. */ | |
268 | ||
269 | #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \ | |
270 | { i386_frame_find_saved_regs ((frame_info), &(frame_saved_regs)); } | |
271 | ||
272 | extern void | |
273 | i386_frame_find_saved_regs PARAMS ((struct frame_info *, | |
274 | struct frame_saved_regs *)); | |
275 | ||
276 | \f | |
277 | /* Things needed for making the inferior call functions. */ | |
278 | ||
279 | /* Push an empty stack frame, to record the current PC, etc. */ | |
280 | ||
281 | #define PUSH_DUMMY_FRAME { i386_push_dummy_frame (); } | |
282 | ||
283 | extern void | |
284 | i386_push_dummy_frame PARAMS ((void)); | |
285 | ||
286 | /* Discard from the stack the innermost frame, restoring all registers. */ | |
287 | ||
288 | #define POP_FRAME { i386_pop_frame (); } | |
289 | ||
290 | extern void | |
291 | i386_pop_frame PARAMS ((void)); | |
292 | ||
293 | /* this is | |
294 | * call 11223344 (32 bit relative) | |
295 | * int3 | |
296 | */ | |
297 | ||
298 | #define CALL_DUMMY { 0x223344e8, 0xcc11 } | |
299 | ||
300 | #define CALL_DUMMY_LENGTH 8 | |
301 | ||
302 | #define CALL_DUMMY_START_OFFSET 0 /* Start execution at beginning of dummy */ | |
303 | ||
304 | /* Insert the specified number of args and function address | |
305 | into a call sequence of the above form stored at DUMMYNAME. */ | |
306 | ||
307 | #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \ | |
308 | { \ | |
309 | *(int *)((char *)(dummyname) + 1) = (int)(fun) - (pc) - 5; \ | |
310 | } |