4187119d |
1 | /* Definitions to make GDB run on an ISI Optimum V (3.05) under 4.3bsd. |
2 | Copyright (C) 1987, 1989 Free Software Foundation, Inc. |
7b4ac7e1 |
3 | |
4187119d |
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 | /* This has not been tested on ISI's running BSD 4.2, but it will probably |
21 | work. */ |
7b4ac7e1 |
22 | |
e91b87a3 |
23 | /* Identify this machine */ |
24 | #ifndef ISI68K |
25 | #define ISI68K |
7b4ac7e1 |
26 | #endif |
27 | |
4187119d |
28 | /* Define the bit, byte, and word ordering of the machine. */ |
29 | #define BITS_BIG_ENDIAN |
30 | #define BYTES_BIG_ENDIAN |
31 | #define WORDS_BIG_ENDIAN |
32 | |
7b4ac7e1 |
33 | /* Define this if the C compiler puts an underscore at the front |
34 | of external names before giving them to the linker. */ |
35 | |
36 | #define NAMES_HAVE_UNDERSCORE |
37 | |
38 | /* Debugger information will be in DBX format. */ |
39 | |
40 | #define READ_DBX_FORMAT |
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 |
48 | to reach some "real" code. */ |
49 | |
50 | #define SKIP_PROLOGUE(pc) \ |
51 | { register int op = read_memory_integer (pc, 2); \ |
e91b87a3 |
52 | if (op == 0047126) \ |
7b4ac7e1 |
53 | pc += 4; /* Skip link #word */ \ |
e91b87a3 |
54 | else if (op == 0044016) \ |
7b4ac7e1 |
55 | pc += 6; /* Skip link #long */ \ |
e91b87a3 |
56 | else if (op == 0060000) \ |
57 | pc += 4; /* Skip bra #word */ \ |
58 | else if (op == 00600377) \ |
59 | pc += 6; /* skip bra #long */ \ |
60 | else if ((op & 0177400) == 0060000) \ |
61 | pc += 2; /* skip bra #char */ \ |
7b4ac7e1 |
62 | } |
63 | |
e91b87a3 |
64 | |
7b4ac7e1 |
65 | /* Immediately after a function call, return the saved pc. |
e91b87a3 |
66 | Can't always go through the frames for this because on some machines |
7b4ac7e1 |
67 | the new frame is not set up until the new function executes |
68 | some instructions. */ |
69 | |
70 | #define SAVED_PC_AFTER_CALL(frame) \ |
71 | read_memory_integer (read_register (SP_REGNUM), 4) |
72 | |
73 | /* This is the amount to subtract from u.u_ar0 |
74 | to get the offset in the core file of the register values. */ |
75 | |
4187119d |
76 | /*#define KERNEL_U_ADDR 0x10800000*/ |
77 | #define KERNEL_U_ADDR 0 |
7b4ac7e1 |
78 | |
79 | /* Address of end of stack space. */ |
80 | |
4187119d |
81 | /*#define STACK_END_ADDR 0x10000000*/ |
82 | #define STACK_END_ADDR 0xfffe000 |
7b4ac7e1 |
83 | |
84 | /* Stack grows downward. */ |
85 | |
86 | #define INNER_THAN < |
87 | |
88 | /* Sequence of bytes for breakpoint instruction. */ |
89 | |
e91b87a3 |
90 | #define BREAKPOINT {0x4e, 0x4f} |
91 | |
92 | /* Data segment starts at etext rounded up to DATAROUND in {N,Z}MAGIC files */ |
93 | |
94 | #define DATAROUND 0x20000 |
95 | #define N_DATADDR(hdr) (hdr.a_magic != OMAGIC ? \ |
96 | (hdr.a_text + DATAROUND) & ~(DATAROUND-1) : hdr.a_text) |
97 | |
98 | /* Text segment starts at sizeof (struct exec) in {N,Z}MAGIC files */ |
99 | |
100 | #define N_TXTADDR(hdr) (hdr.a_magic != OMAGIC ? sizeof (struct exec) : 0) |
7b4ac7e1 |
101 | |
102 | /* Amount PC must be decremented by after a breakpoint. |
103 | This is often the number of bytes in BREAKPOINT |
4187119d |
104 | but not always. |
e91b87a3 |
105 | On the ISI, the kernel resets the pc to the trap instr */ |
7b4ac7e1 |
106 | |
e91b87a3 |
107 | #define DECR_PC_AFTER_BREAK 0 |
7b4ac7e1 |
108 | |
109 | /* Nonzero if instruction at PC is a return instruction. */ |
110 | |
3bf57d21 |
111 | #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 2) == 0x4e75) |
7b4ac7e1 |
112 | |
113 | /* Return 1 if P points to an invalid floating point value. */ |
114 | |
115 | #define INVALID_FLOAT(p, len) 0 /* Just a first guess; not checked */ |
116 | |
e91b87a3 |
117 | /* Largest integer type */ |
118 | #define LONGEST long |
119 | |
120 | /* Name of the builtin type for the LONGEST type above. */ |
121 | #define BUILTIN_TYPE_LONGEST builtin_type_long |
122 | |
123 | /* Say how long registers are. */ |
7b4ac7e1 |
124 | |
125 | #define REGISTER_TYPE long |
126 | |
127 | /* Number of machine registers */ |
7b4ac7e1 |
128 | #define NUM_REGS 29 |
129 | |
130 | /* Initializer for an array of names of registers. |
131 | There should be NUM_REGS strings in this initializer. */ |
132 | |
133 | #define REGISTER_NAMES \ |
134 | {"d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", \ |
e91b87a3 |
135 | "a0", "a1", "a2", "a3", "a4", "a5", "fp", "sp", \ |
7b4ac7e1 |
136 | "ps", "pc", \ |
137 | "fp0", "fp1", "fp2", "fp3", "fp4", "fp5", "fp6", "fp7", \ |
138 | "fpcontrol", "fpstatus", "fpiaddr" } |
139 | |
140 | /* Register numbers of various important registers. |
141 | Note that some of these values are "real" register numbers, |
142 | and correspond to the general registers of the machine, |
143 | and some are "phony" register numbers which are too large |
144 | to be actual register numbers as far as the user is concerned |
145 | but do serve to get the desired values when passed to read_register. */ |
146 | |
147 | #define FP_REGNUM 14 /* Contains address of executing stack frame */ |
148 | #define SP_REGNUM 15 /* Contains address of top of stack */ |
149 | #define PS_REGNUM 16 /* Contains processor status */ |
150 | #define PC_REGNUM 17 /* Contains program counter */ |
151 | #define FP0_REGNUM 18 /* Floating point register 0 */ |
152 | #define FPC_REGNUM 26 /* 68881 control register */ |
e91b87a3 |
153 | |
4187119d |
154 | /* expects blockend to be u.u_ar0 */ |
155 | extern int rloc[]; /* Defined in isi-dep.c */ |
156 | #define REGISTER_U_ADDR(addr, blockend, regno) \ |
157 | { blockend &= UPAGES*NBPG - 1; \ |
158 | if (regno < 18) addr = (int)blockend + rloc[regno]*4; \ |
159 | else if (regno < 26) addr = (int) &((struct user *)0)->u_68881_regs \ |
160 | + (regno - 18) * 12; \ |
161 | else if (regno < 29) addr = (int) &((struct user *)0)->u_68881_regs \ |
162 | + 8 * 12 + (regno - 26) * 4; \ |
e91b87a3 |
163 | } |
7b4ac7e1 |
164 | |
165 | /* Total amount of space needed to store our copies of the machine's |
166 | register state, the array `registers'. */ |
e91b87a3 |
167 | #define REGISTER_BYTES (16*4+8*12+8+20) |
7b4ac7e1 |
168 | |
169 | /* Index within `registers' of the first byte of the space for |
170 | register N. */ |
171 | |
172 | #define REGISTER_BYTE(N) \ |
173 | ((N) >= FPC_REGNUM ? (((N) - FPC_REGNUM) * 4) + 168 \ |
174 | : (N) >= FP0_REGNUM ? (((N) - FP0_REGNUM) * 12) + 72 \ |
175 | : (N) * 4) |
176 | |
177 | /* Number of bytes of storage in the actual machine representation |
178 | for register N. On the 68000, all regs are 4 bytes |
179 | except the floating point regs which are 12 bytes. */ |
180 | |
181 | #define REGISTER_RAW_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 8 ? 12 : 4) |
182 | |
183 | /* Number of bytes of storage in the program's representation |
184 | for register N. On the 68000, all regs are 4 bytes |
185 | except the floating point regs which are 8-byte doubles. */ |
186 | |
187 | #define REGISTER_VIRTUAL_SIZE(N) (((unsigned)(N) - FP0_REGNUM) < 8 ? 8 : 4) |
188 | |
189 | /* Largest value REGISTER_RAW_SIZE can have. */ |
190 | |
191 | #define MAX_REGISTER_RAW_SIZE 12 |
192 | |
193 | /* Largest value REGISTER_VIRTUAL_SIZE can have. */ |
194 | |
195 | #define MAX_REGISTER_VIRTUAL_SIZE 8 |
196 | |
197 | /* Nonzero if register N requires conversion |
198 | from raw format to virtual format. */ |
199 | |
200 | #define REGISTER_CONVERTIBLE(N) (((unsigned)(N) - FP0_REGNUM) < 8) |
201 | |
202 | /* Convert data from raw format for register REGNUM |
203 | to virtual format for register REGNUM. */ |
204 | |
205 | #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \ |
206 | { if ((REGNUM) >= FP0_REGNUM && (REGNUM) < FPC_REGNUM) \ |
207 | convert_from_68881 ((FROM), (TO)); \ |
208 | else \ |
209 | bcopy ((FROM), (TO), 4); } |
210 | |
211 | /* Convert data from virtual format for register REGNUM |
212 | to raw format for register REGNUM. */ |
213 | |
214 | #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \ |
215 | { if ((REGNUM) >= FP0_REGNUM && (REGNUM) < FPC_REGNUM) \ |
216 | convert_to_68881 ((FROM), (TO)); \ |
217 | else \ |
218 | bcopy ((FROM), (TO), 4); } |
219 | |
220 | /* Return the GDB type object for the "standard" data type |
221 | of data in register N. */ |
222 | |
223 | #define REGISTER_VIRTUAL_TYPE(N) \ |
224 | (((unsigned)(N) - FP0_REGNUM) < 8 ? builtin_type_double : builtin_type_int) |
225 | |
e91b87a3 |
226 | /* Store the address of the place in which to copy the structure the |
227 | subroutine will return. This is called from call_function. */ |
228 | |
229 | #define STORE_STRUCT_RETURN(ADDR, SP) \ |
230 | { write_register (9, (ADDR)); } |
231 | |
7b4ac7e1 |
232 | /* Extract from an array REGBUF containing the (raw) register state |
233 | a function return value of type TYPE, and copy that, in virtual format, |
234 | into VALBUF. */ |
235 | |
236 | #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ |
237 | bcopy (REGBUF, VALBUF, TYPE_LENGTH (TYPE)) |
238 | |
239 | /* Write into appropriate registers a function return value |
240 | of type TYPE, given in virtual format. */ |
241 | |
242 | #define STORE_RETURN_VALUE(TYPE,VALBUF) \ |
243 | write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE)) |
244 | |
245 | /* Extract from an array REGBUF containing the (raw) register state |
246 | the address in which a function should return its structure value, |
247 | as a CORE_ADDR (or an expression that can be used as one). */ |
248 | |
249 | #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF)) |
250 | \f |
251 | /* Describe the pointer in each stack frame to the previous stack frame |
252 | (its caller). */ |
253 | |
254 | /* FRAME_CHAIN takes a frame's nominal address |
255 | and produces the frame's chain-pointer. |
256 | |
257 | FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address |
258 | and produces the nominal address of the caller frame. |
259 | |
260 | However, if FRAME_CHAIN_VALID returns zero, |
261 | it means the given frame is the outermost one and has no caller. |
262 | In that case, FRAME_CHAIN_COMBINE is not used. */ |
263 | |
e91b87a3 |
264 | /* In the case of the ISI, the frame's nominal address |
7b4ac7e1 |
265 | is the address of a 4-byte word containing the calling frame's address. */ |
266 | |
4187119d |
267 | #define FRAME_CHAIN(thisframe) \ |
268 | (outside_startup_file ((thisframe)->pc) ? \ |
269 | read_memory_integer ((thisframe)->frame, 4) :\ |
270 | 0) |
7b4ac7e1 |
271 | |
272 | #define FRAME_CHAIN_VALID(chain, thisframe) \ |
4187119d |
273 | (chain != 0 && outside_startup_file (FRAME_SAVED_PC (thisframe))) |
7b4ac7e1 |
274 | |
275 | #define FRAME_CHAIN_COMBINE(chain, thisframe) (chain) |
276 | |
277 | /* Define other aspects of the stack frame. */ |
278 | |
4187119d |
279 | /* A macro that tells us whether the function invocation represented |
280 | by FI does not have a frame on the stack associated with it. If it |
281 | does not, FRAMELESS is set to 1, else 0. */ |
282 | #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \ |
283 | FRAMELESS_LOOK_FOR_PROLOGUE(FI, FRAMELESS) |
284 | |
e91b87a3 |
285 | #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4)) |
7b4ac7e1 |
286 | |
e91b87a3 |
287 | #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame) |
7b4ac7e1 |
288 | |
e91b87a3 |
289 | #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame) |
7b4ac7e1 |
290 | |
e91b87a3 |
291 | /* Return number of args passed to a frame. |
292 | Can return -1, meaning no way to tell. */ |
7b4ac7e1 |
293 | |
294 | #define FRAME_NUM_ARGS(val, fi) \ |
e91b87a3 |
295 | { register CORE_ADDR pc = FRAME_SAVED_PC (fi); \ |
7b4ac7e1 |
296 | register int insn = 0177777 & read_memory_integer (pc, 2); \ |
297 | val = 0; \ |
298 | if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */ \ |
299 | val = read_memory_integer (pc + 2, 2); \ |
300 | else if ((insn & 0170777) == 0050217 /* addql #N, sp */ \ |
301 | || (insn & 0170777) == 0050117) /* addqw */ \ |
302 | { val = (insn >> 9) & 7; if (val == 0) val = 8; } \ |
303 | else if (insn == 0157774) /* addal #WW, sp */ \ |
304 | val = read_memory_integer (pc + 2, 4); \ |
305 | val >>= 2; } |
306 | |
307 | /* Return number of bytes at start of arglist that are not really args. */ |
308 | |
309 | #define FRAME_ARGS_SKIP 8 |
310 | |
311 | /* Put here the code to store, into a struct frame_saved_regs, |
312 | the addresses of the saved registers of frame described by FRAME_INFO. |
313 | This includes special registers such as pc and fp saved in special |
314 | ways in the stack frame. sp is even more special: |
315 | the address we return for it IS the sp for the next frame. */ |
316 | |
317 | #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \ |
318 | { register int regnum; \ |
319 | register int regmask; \ |
320 | register CORE_ADDR next_addr; \ |
321 | register CORE_ADDR pc; \ |
e91b87a3 |
322 | register int insn; \ |
323 | register int offset; \ |
7b4ac7e1 |
324 | bzero (&frame_saved_regs, sizeof frame_saved_regs); \ |
e91b87a3 |
325 | if ((frame_info)->pc >= (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM*4 - 8*12 - 4 \ |
326 | && (frame_info)->pc <= (frame_info)->frame) \ |
327 | { next_addr = (frame_info)->frame; \ |
328 | pc = (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM * 4 - 8*12 - 4; }\ |
7b4ac7e1 |
329 | else \ |
e91b87a3 |
330 | { pc = get_pc_function_start ((frame_info)->pc); \ |
331 | /* Verify we have a link a6 instruction next, \ |
332 | or a branch followed by a link a6 instruction; \ |
7b4ac7e1 |
333 | if not we lose. If we win, find the address above the saved \ |
334 | regs using the amount of storage from the link instruction. */\ |
e91b87a3 |
335 | retry: \ |
336 | insn = read_memory_integer (pc, 2); \ |
337 | if (insn == 044016) \ |
338 | next_addr = (frame_info)->frame - read_memory_integer (pc += 2, 4), pc+=4; \ |
339 | else if (insn == 047126) \ |
340 | next_addr = (frame_info)->frame - read_memory_integer (pc += 2, 2), pc+=2; \ |
341 | else if ((insn & 0177400) == 060000) /* bra insn */ \ |
342 | { offset = insn & 0377; \ |
343 | pc += 2; /* advance past bra */ \ |
344 | if (offset == 0) /* bra #word */ \ |
345 | offset = read_memory_integer (pc, 2), pc += 2; \ |
346 | else if (offset == 0377) /* bra #long */ \ |
347 | offset = read_memory_integer (pc, 4), pc += 4; \ |
348 | pc += offset; \ |
349 | goto retry; \ |
350 | } else goto lose; \ |
7b4ac7e1 |
351 | /* If have an addal #-n, sp next, adjust next_addr. */ \ |
352 | if ((0177777 & read_memory_integer (pc, 2)) == 0157774) \ |
353 | next_addr += read_memory_integer (pc += 2, 4), pc += 4; \ |
354 | } \ |
355 | /* next should be a moveml to (sp) or -(sp) or a movl r,-(sp) */ \ |
e91b87a3 |
356 | insn = read_memory_integer (pc, 2), pc += 2; \ |
357 | regmask = read_memory_integer (pc, 2); \ |
358 | if ((insn & 0177760) == 022700) /* movl rn, (sp) */ \ |
359 | (frame_saved_regs).regs[(insn&7) + ((insn&010)?8:0)] = next_addr; \ |
360 | else if ((insn & 0177760) == 024700) /* movl rn, -(sp) */ \ |
361 | (frame_saved_regs).regs[(insn&7) + ((insn&010)?8:0)] = next_addr-=4; \ |
362 | else if (insn == 0044327) /* moveml mask, (sp) */ \ |
363 | { pc += 2; \ |
364 | /* Regmask's low bit is for register 0, the first written */ \ |
365 | next_addr -= 4; \ |
7b4ac7e1 |
366 | for (regnum = 0; regnum < 16; regnum++, regmask >>= 1) \ |
367 | if (regmask & 1) \ |
e91b87a3 |
368 | (frame_saved_regs).regs[regnum] = (next_addr += 4); \ |
369 | } else if (insn == 0044347) /* moveml mask, -(sp) */ \ |
370 | { pc += 2; \ |
371 | /* Regmask's low bit is for register 15, the first pushed */ \ |
7b4ac7e1 |
372 | for (regnum = 15; regnum >= 0; regnum--, regmask >>= 1) \ |
373 | if (regmask & 1) \ |
374 | (frame_saved_regs).regs[regnum] = (next_addr -= 4); } \ |
375 | /* clrw -(sp); movw ccr,-(sp) may follow. */ \ |
e91b87a3 |
376 | if (read_memory_integer (pc, 2) == 041147 \ |
377 | && read_memory_integer (pc+2, 2) == 042347) \ |
7b4ac7e1 |
378 | (frame_saved_regs).regs[PS_REGNUM] = (next_addr -= 4); \ |
379 | lose: ; \ |
e91b87a3 |
380 | (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 8; \ |
381 | (frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame; \ |
382 | (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 4; \ |
7b4ac7e1 |
383 | } |
e91b87a3 |
384 | |
4187119d |
385 | /* Compensate for lack of `vprintf' function. */ |
386 | #ifndef HAVE_VPRINTF |
387 | #define vprintf(format, ap) _doprnt (format, ap, stdout) |
388 | #endif |
7b4ac7e1 |
389 | \f |
390 | /* Things needed for making the inferior call functions. */ |
391 | |
392 | /* Push an empty stack frame, to record the current PC, etc. */ |
393 | |
394 | #define PUSH_DUMMY_FRAME \ |
395 | { register CORE_ADDR sp = read_register (SP_REGNUM); \ |
396 | register int regnum; \ |
397 | char raw_buffer[12]; \ |
398 | sp = push_word (sp, read_register (PC_REGNUM)); \ |
399 | sp = push_word (sp, read_register (FP_REGNUM)); \ |
400 | write_register (FP_REGNUM, sp); \ |
401 | for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--) \ |
402 | { read_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12); \ |
403 | sp = push_bytes (sp, raw_buffer, 12); } \ |
404 | for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--) \ |
405 | sp = push_word (sp, read_register (regnum)); \ |
406 | sp = push_word (sp, read_register (PS_REGNUM)); \ |
407 | write_register (SP_REGNUM, sp); } |
408 | |
e91b87a3 |
409 | /* Discard from the stack the innermost frame, restoring all registers. */ |
7b4ac7e1 |
410 | |
411 | #define POP_FRAME \ |
e91b87a3 |
412 | { register FRAME frame = get_current_frame (); \ |
413 | register CORE_ADDR fp; \ |
414 | register int regnum; \ |
415 | struct frame_saved_regs fsr; \ |
416 | struct frame_info *fi; \ |
417 | char raw_buffer[12]; \ |
418 | fi = get_frame_info (frame); \ |
419 | fp = fi->frame; \ |
420 | get_frame_saved_regs (fi, &fsr); \ |
421 | for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--) \ |
422 | if (fsr.regs[regnum]) \ |
423 | { read_memory (fsr.regs[regnum], raw_buffer, 12); \ |
7b4ac7e1 |
424 | write_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12); }\ |
e91b87a3 |
425 | for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--) \ |
426 | if (fsr.regs[regnum]) \ |
7b4ac7e1 |
427 | write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \ |
e91b87a3 |
428 | if (fsr.regs[PS_REGNUM]) \ |
7b4ac7e1 |
429 | write_register (PS_REGNUM, read_memory_integer (fsr.regs[PS_REGNUM], 4)); \ |
e91b87a3 |
430 | write_register (FP_REGNUM, read_memory_integer (fp, 4)); \ |
431 | write_register (PC_REGNUM, read_memory_integer (fp + 4, 4)); \ |
432 | write_register (SP_REGNUM, fp + 8); \ |
433 | flush_cached_frames (); \ |
434 | set_current_frame ( create_new_frame (read_register (FP_REGNUM), \ |
435 | read_pc ())); } |
7b4ac7e1 |
436 | |
437 | /* This sequence of words is the instructions |
e91b87a3 |
438 | fmovem #<f0-f7>,-(sp) |
7b4ac7e1 |
439 | moveml 0xfffc,-(sp) |
440 | clrw -(sp) |
441 | movew ccr,-(sp) |
442 | /..* The arguments are pushed at this point by GDB; |
443 | no code is needed in the dummy for this. |
4187119d |
444 | The CALL_DUMMY_START_OFFSET gives the position of |
7b4ac7e1 |
445 | the following jsr instruction. *../ |
446 | jsr @#32323232 |
447 | addl #69696969,sp |
e91b87a3 |
448 | bpt |
7b4ac7e1 |
449 | nop |
e91b87a3 |
450 | Note this is 24 bytes. |
7b4ac7e1 |
451 | We actually start executing at the jsr, since the pushing of the |
452 | registers is done by PUSH_DUMMY_FRAME. If this were real code, |
453 | the arguments for the function called by the jsr would be pushed |
454 | between the moveml and the jsr, and we could allow it to execute through. |
455 | But the arguments have to be pushed by GDB after the PUSH_DUMMY_FRAME is done, |
456 | and we cannot allow the moveml to push the registers again lest they be |
457 | taken for the arguments. */ |
458 | |
e91b87a3 |
459 | #define CALL_DUMMY {0xf227e0ff, 0x48e7fffc, 0x426742e7, 0x4eb93232, 0x3232dffc, 0x69696969, 0x4e4f4e71} |
7b4ac7e1 |
460 | |
461 | #define CALL_DUMMY_LENGTH 28 |
462 | |
463 | #define CALL_DUMMY_START_OFFSET 12 |
464 | |
465 | /* Insert the specified number of args and function address |
466 | into a call sequence of the above form stored at DUMMYNAME. */ |
467 | |
e91b87a3 |
468 | #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, type) \ |
7b4ac7e1 |
469 | { *(int *)((char *) dummyname + 20) = nargs * 4; \ |
470 | *(int *)((char *) dummyname + 14) = fun; } |
471 | \f |
472 | /* Interface definitions for kernel debugger KDB. */ |
473 | |
474 | /* Map machine fault codes into signal numbers. |
475 | First subtract 0, divide by 4, then index in a table. |
476 | Faults for which the entry in this table is 0 |
477 | are not handled by KDB; the program's own trap handler |
478 | gets to handle then. */ |
479 | |
480 | #define FAULT_CODE_ORIGIN 0 |
481 | #define FAULT_CODE_UNITS 4 |
482 | #define FAULT_TABLE \ |
483 | { 0, 0, 0, 0, SIGTRAP, 0, 0, 0, \ |
484 | 0, SIGTRAP, 0, 0, 0, 0, 0, SIGKILL, \ |
485 | 0, 0, 0, 0, 0, 0, 0, 0, \ |
486 | SIGILL } |
487 | |
488 | /* Start running with a stack stretching from BEG to END. |
489 | BEG and END should be symbols meaningful to the assembler. |
490 | This is used only for kdb. */ |
491 | |
492 | #define INIT_STACK(beg, end) \ |
493 | { asm (".globl end"); \ |
e91b87a3 |
494 | asm ("movl $ end, sp"); \ |
495 | asm ("clrl fp"); } |
7b4ac7e1 |
496 | |
497 | /* Push the frame pointer register on the stack. */ |
498 | #define PUSH_FRAME_PTR \ |
e91b87a3 |
499 | asm ("movel fp, -(sp)"); |
7b4ac7e1 |
500 | |
501 | /* Copy the top-of-stack to the frame pointer register. */ |
502 | #define POP_FRAME_PTR \ |
e91b87a3 |
503 | asm ("movl (sp), fp"); |
7b4ac7e1 |
504 | |
505 | /* After KDB is entered by a fault, push all registers |
506 | that GDB thinks about (all NUM_REGS of them), |
507 | so that they appear in order of ascending GDB register number. |
508 | The fault code will be on the stack beyond the last register. */ |
509 | |
510 | #define PUSH_REGISTERS \ |
511 | { asm ("clrw -(sp)"); \ |
e91b87a3 |
512 | asm ("pea 10(sp)"); \ |
513 | asm ("movem $ 0xfffe,-(sp)"); } |
7b4ac7e1 |
514 | |
515 | /* Assuming the registers (including processor status) have been |
516 | pushed on the stack in order of ascending GDB register number, |
517 | restore them and return to the address in the saved PC register. */ |
518 | |
519 | #define POP_REGISTERS \ |
e91b87a3 |
520 | { asm ("subil $8,28(sp)"); \ |
521 | asm ("movem (sp),$ 0xffff"); \ |
7b4ac7e1 |
522 | asm ("rte"); } |