3bf57d21 |
1 | /* Parameters for execution on a Gould PN, for GDB, the GNU debugger. |
2 | Copyright (C) 1986, 1987 Free Software Foundation, Inc. |
3 | |
4 | GDB is distributed in the hope that it will be useful, but WITHOUT ANY |
5 | WARRANTY. No author or distributor accepts responsibility to anyone |
6 | for the consequences of using it or for whether it serves any |
7 | particular purpose or works at all, unless he says so in writing. |
8 | Refer to the GDB General Public License for full details. |
9 | |
10 | Everyone is granted permission to copy, modify and redistribute GDB, |
11 | but only under the conditions described in the GDB General Public |
12 | License. A copy of this license is supposed to have been given to you |
13 | along with GDB so you can know your rights and responsibilities. It |
14 | should be in a file named COPYING. Among other things, the copyright |
15 | notice and this notice must be preserved on all copies. |
16 | |
17 | In other words, go ahead and share GDB, but don't try to stop |
18 | anyone else from sharing it farther. Help stamp out software hoarding! */ |
19 | |
20 | /* Read file headers properly in core.c */ |
21 | #define gould |
22 | |
23 | /* Macro for text-offset and data info (in PN a.out format). */ |
24 | #define TEXTINFO \ |
25 | text_offset = N_TXTOFF (exec_coffhdr); \ |
26 | exec_data_offset = N_TXTOFF (exec_coffhdr) \ |
27 | + exec_aouthdr.a_text |
28 | |
29 | /* Macro for number of symbol table entries */ |
30 | #define END_OF_TEXT_DEFAULT \ |
31 | (0xffffff) |
32 | |
33 | /* Macro for number of symbol table entries */ |
34 | #define NUMBER_OF_SYMBOLS \ |
35 | (coffhdr.f_nsyms) |
36 | |
37 | /* Macro for file-offset of symbol table (in usual a.out format). */ |
38 | #define SYMBOL_TABLE_OFFSET \ |
39 | N_SYMOFF (coffhdr) |
40 | |
41 | /* Macro for file-offset of string table (in usual a.out format). */ |
42 | #define STRING_TABLE_OFFSET \ |
43 | (N_STROFF (coffhdr) + sizeof(int)) |
44 | |
45 | /* Macro to store the length of the string table data in INTO. */ |
46 | #define READ_STRING_TABLE_SIZE(INTO) \ |
47 | { INTO = hdr.a_stsize; } |
48 | |
49 | /* Macro to declare variables to hold the file's header data. */ |
50 | #define DECLARE_FILE_HEADERS struct old_exec hdr; \ |
51 | FILHDR coffhdr |
52 | |
53 | /* Macro to read the header data from descriptor DESC and validate it. |
54 | NAME is the file name, for error messages. */ |
55 | #define READ_FILE_HEADERS(DESC, NAME) \ |
56 | { val = myread (DESC, &coffhdr, sizeof coffhdr); \ |
57 | if (val < 0) \ |
58 | perror_with_name (NAME); \ |
59 | val = myread (DESC, &hdr, sizeof hdr); \ |
60 | if (val < 0) \ |
61 | perror_with_name (NAME); \ |
62 | if (coffhdr.f_magic != GNP1MAGIC) \ |
63 | error ("File \"%s\" not in coff executable format.", NAME); \ |
64 | if (N_BADMAG (hdr)) \ |
65 | error ("File \"%s\" not in executable format.", NAME); } |
66 | |
67 | /* Define COFF and other symbolic names needed on NP1 */ |
68 | #define NS32GMAGIC GDPMAGIC |
69 | #define NS32SMAGIC PN_MAGIC |
70 | #define vprintf printf |
71 | |
72 | /* Get rid of any system-imposed stack limit if possible. */ |
73 | #define SET_STACK_LIMIT_HUGE |
74 | |
75 | /* Define this if the C compiler puts an underscore at the front |
76 | of external names before giving them to the linker. */ |
77 | #define NAMES_HAVE_UNDERSCORE |
78 | |
79 | /* Debugger information will be in DBX format. */ |
80 | #define READ_DBX_FORMAT |
81 | |
82 | /* Offset from address of function to start of its code. |
83 | Zero on most machines. */ |
84 | #define FUNCTION_START_OFFSET 4 |
85 | |
86 | /* Advance PC across any function entry prologue instructions |
87 | to reach some "real" code. One PN we can have one or two startup |
88 | sequences depending on the size of the local stack: |
89 | |
90 | Either: |
91 | "suabr b2, #" |
92 | of |
93 | "lil r4, #", "suabr b2, #(r4)" |
94 | |
95 | "lwbr b6, #", "stw r1, 8(b2)" |
96 | Optional "stwbr b3, c(b2)" |
97 | Optional "trr r2,r7" (Gould first argument register passing) |
98 | or |
99 | Optional "stw r2,8(b3)" (Gould first argument register passing) |
100 | */ |
101 | #define SKIP_PROLOGUE(pc) { \ |
102 | register int op = read_memory_integer ((pc), 4); \ |
103 | if ((op & 0xffff0000) == 0x580B0000) { \ |
104 | pc += 4; \ |
105 | op = read_memory_integer ((pc), 4); \ |
106 | if ((op & 0xffff0000) == 0x59400000) { \ |
107 | pc += 4; \ |
108 | op = read_memory_integer ((pc), 4); \ |
109 | if ((op & 0xffff0000) == 0x5F000000) { \ |
110 | pc += 4; \ |
111 | op = read_memory_integer ((pc), 4); \ |
112 | if (op == 0xD4820008) { \ |
113 | pc += 4; \ |
114 | op = read_memory_integer ((pc), 4); \ |
115 | if (op == 0x5582000C) { \ |
116 | pc += 4; \ |
117 | op = read_memory_integer ((pc), 2); \ |
118 | if (op == 0x2fa0) { \ |
119 | pc += 2; \ |
120 | } else { \ |
121 | op = read_memory_integer ((pc), 4); \ |
122 | if (op == 0xd5030008) { \ |
123 | pc += 4; \ |
124 | } \ |
125 | } \ |
126 | } else { \ |
127 | op = read_memory_integer ((pc), 2); \ |
128 | if (op == 0x2fa0) { \ |
129 | pc += 2; \ |
130 | } \ |
131 | } \ |
132 | } \ |
133 | } \ |
134 | } \ |
135 | } \ |
136 | if ((op & 0xffff0000) == 0x59000000) { \ |
137 | pc += 4; \ |
138 | op = read_memory_integer ((pc), 4); \ |
139 | if ((op & 0xffff0000) == 0x5F000000) { \ |
140 | pc += 4; \ |
141 | op = read_memory_integer ((pc), 4); \ |
142 | if (op == 0xD4820008) { \ |
143 | pc += 4; \ |
144 | op = read_memory_integer ((pc), 4); \ |
145 | if (op == 0x5582000C) { \ |
146 | pc += 4; \ |
147 | op = read_memory_integer ((pc), 2); \ |
148 | if (op == 0x2fa0) { \ |
149 | pc += 2; \ |
150 | } else { \ |
151 | op = read_memory_integer ((pc), 4); \ |
152 | if (op == 0xd5030008) { \ |
153 | pc += 4; \ |
154 | } \ |
155 | } \ |
156 | } else { \ |
157 | op = read_memory_integer ((pc), 2); \ |
158 | if (op == 0x2fa0) { \ |
159 | pc += 2; \ |
160 | } \ |
161 | } \ |
162 | } \ |
163 | } \ |
164 | } \ |
165 | } |
166 | |
167 | /* Immediately after a function call, return the saved pc. |
168 | Can't go through the frames for this because on some machines |
169 | the new frame is not set up until the new function executes |
170 | some instructions. True on PN! Return address is in R1. |
171 | Note: true return location is 4 bytes past R1! */ |
172 | #define SAVED_PC_AFTER_CALL(frame) \ |
173 | (read_register(R1_REGNUM) + 4) |
174 | |
175 | /* Address of U in kernel space */ |
176 | #define KERNEL_U_ADDR 0x3fc000 |
177 | |
178 | /* Address of end of stack space. */ |
179 | #define STACK_END_ADDR 0x480000 |
180 | |
181 | /* Stack grows downward. */ |
182 | #define INNER_THAN < |
183 | |
184 | /* Sequence of bytes for breakpoint instruction. */ |
185 | #define BREAKPOINT {0x28, 0x09} |
186 | |
187 | /* Amount PC must be decremented by after a breakpoint. |
188 | This is often the number of bytes in BREAKPOINT |
189 | but not always. */ |
190 | #define DECR_PC_AFTER_BREAK 2 |
191 | |
192 | /* Nonzero if instruction at PC is a return instruction. "bu 4(r1)" */ |
193 | #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 4) == 0xEC100004) |
194 | |
195 | /* Return 1 if P points to an invalid floating point value. */ |
196 | #define INVALID_FLOAT(p, len) ((*(short *)p & 0xff80) == 0x8000) |
197 | |
198 | /* Say how long (ordinary) registers are. */ |
199 | #define REGISTER_TYPE long |
200 | |
201 | /* Number of machine registers */ |
202 | #define NUM_REGS 19 |
203 | #define NUM_GEN_REGS 16 |
204 | #define NUM_CPU_REGS 3 |
205 | |
206 | /* Initializer for an array of names of registers. |
207 | There should be NUM_REGS strings in this initializer. */ |
208 | #define REGISTER_NAMES { \ |
209 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \ |
210 | "b0", "b1", "b2", "b3", "b4", "b5", "b6", "b7", \ |
211 | "sp", "ps", "pc", \ |
212 | } |
213 | |
214 | /* Register numbers of various important registers. |
215 | Note that some of these values are "real" register numbers, |
216 | and correspond to the general registers of the machine, |
217 | and some are "phony" register numbers which are too large |
218 | to be actual register numbers as far as the user is concerned |
219 | but do serve to get the desired values when passed to read_register. */ |
220 | #define R1_REGNUM 1 /* Gr1 => return address of caller */ |
221 | #define R4_REGNUM 4 /* Gr4 => register save area */ |
222 | #define R5_REGNUM 5 /* Gr5 => register save area */ |
223 | #define R6_REGNUM 6 /* Gr6 => register save area */ |
224 | #define R7_REGNUM 7 /* Gr7 => register save area */ |
225 | #define B1_REGNUM 9 /* Br1 => start of this code routine */ |
226 | #define FP_REGNUM 10 /* Br2 == (sp) */ |
227 | #define AP_REGNUM 11 /* Br3 == (ap) */ |
228 | #define SP_REGNUM 16 /* A copy of Br2 saved in trap */ |
229 | #define PS_REGNUM 17 /* Contains processor status */ |
230 | #define PC_REGNUM 18 /* Contains program counter */ |
231 | |
232 | /* This is a piece of magic that is given a register number REGNO |
233 | and as BLOCKEND the address in the system of the end of the user structure |
234 | and stores in ADDR the address in the kernel or core dump |
235 | of that register. */ |
236 | #define REGISTER_U_ADDR(addr, blockend, regno) { \ |
237 | addr = blockend + regno * 4; \ |
238 | if (regno == PC_REGNUM) addr = blockend - 8 * 4; \ |
239 | if (regno == PS_REGNUM) addr = blockend - 7 * 4; \ |
240 | if (regno == SP_REGNUM) addr = blockend - 6 * 4; \ |
241 | } |
242 | |
243 | /* Total amount of space needed to store our copies of the machine's |
244 | register state, the array `registers'. */ |
245 | #define REGISTER_BYTES (NUM_GEN_REGS*4 + NUM_CPU_REGS*4) |
246 | |
247 | /* Index within `registers' of the first byte of the space for |
248 | register N. */ |
249 | #define REGISTER_BYTE(N) ((N) * 4) |
250 | |
251 | /* Number of bytes of storage in the actual machine representation |
252 | for register N. On the PN, all normal regs are 4 bytes. */ |
253 | #define REGISTER_RAW_SIZE(N) (4) |
254 | |
255 | /* Number of bytes of storage in the program's representation |
256 | for register N. On the PN, all regs are 4 bytes. */ |
257 | #define REGISTER_VIRTUAL_SIZE(N) (4) |
258 | |
259 | /* Largest value REGISTER_RAW_SIZE can have. */ |
260 | #define MAX_REGISTER_RAW_SIZE (4) |
261 | |
262 | /* Largest value REGISTER_VIRTUAL_SIZE can have. */ |
263 | #define MAX_REGISTER_VIRTUAL_SIZE (4) |
264 | |
265 | /* Nonzero if register N requires conversion |
266 | from raw format to virtual format. */ |
267 | #define REGISTER_CONVERTIBLE(N) (0) |
268 | |
269 | /* Convert data from raw format for register REGNUM |
270 | to virtual format for register REGNUM. */ |
271 | #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \ |
272 | bcopy ((FROM), (TO), REGISTER_RAW_SIZE(REGNUM)); |
273 | |
274 | /* Convert data from virtual format for register REGNUM |
275 | to raw format for register REGNUM. */ |
276 | #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \ |
277 | bcopy ((FROM), (TO), REGISTER_VIRTUAL_SIZE(REGNUM)); |
278 | |
279 | /* Return the GDB type object for the "standard" data type |
280 | of data in register N. */ |
281 | #define REGISTER_VIRTUAL_TYPE(N) (builtin_type_int) |
282 | |
283 | /* Extract from an arrary REGBUF containing the (raw) register state |
284 | a function return value of type TYPE, and copy that, in virtual format, |
285 | into VALBUF. */ |
286 | |
287 | #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ |
288 | bcopy (REGBUF, VALBUF, TYPE_LENGTH (TYPE)) |
289 | |
290 | /* Write into appropriate registers a function return value |
291 | of type TYPE, given in virtual format. */ |
292 | |
293 | #define STORE_RETURN_VALUE(TYPE,VALBUF) \ |
294 | write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE)) |
295 | |
296 | /* Extract from an array REGBUF containing the (raw) register state |
297 | the address in which a function should return its structure value, |
298 | as a CORE_ADDR (or an expression that can be used as one). */ |
299 | |
300 | #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF)) |
301 | |
302 | \f |
303 | /* Describe the pointer in each stack frame to the previous stack frame |
304 | (its caller). */ |
305 | |
306 | /* FRAME_CHAIN takes a frame's nominal address |
307 | and produces the frame's chain-pointer. |
308 | |
309 | FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address |
310 | and produces the nominal address of the caller frame. |
311 | |
312 | However, if FRAME_CHAIN_VALID returns zero, |
313 | it means the given frame is the outermost one and has no caller. |
314 | In that case, FRAME_CHAIN_COMBINE is not used. */ |
315 | |
316 | /* In the case of the NPL, the frame's norminal address is Br2 and the |
317 | previous routines frame is up the stack X bytes, where X is the |
318 | value stored in the code function header xA(Br1). */ |
319 | #define FRAME_CHAIN(thisframe) (findframe(thisframe)) |
320 | |
321 | #define FRAME_CHAIN_VALID(chain, thisframe) \ |
322 | (chain != 0 && chain != thisframe) |
323 | |
324 | #define FRAME_CHAIN_COMBINE(chain, thisframe) \ |
325 | (chain) |
326 | |
327 | /* Define other aspects of the stack frame on NPL. */ |
328 | #define FRAME_SAVED_PC(frame) \ |
329 | (read_memory_integer (frame + 8, 4)) |
330 | |
331 | #define FRAME_ARGS_ADDRESS(fi) \ |
332 | ((fi).next_frame ? \ |
333 | read_memory_integer ((fi).frame + 12, 4) : \ |
334 | read_register (AP_REGNUM)) |
335 | |
336 | #define FRAME_LOCALS_ADDRESS(fi) ((fi).frame + 80) |
337 | |
338 | /* Set VAL to the number of args passed to frame described by FI. |
339 | Can set VAL to -1, meaning no way to tell. */ |
340 | |
341 | /* We can check the stab info to see how |
342 | many arg we have. No info in stack will tell us */ |
343 | #define FRAME_NUM_ARGS(val,fi) (val = findarg(fi)) |
344 | |
345 | /* Return number of bytes at start of arglist that are not really args. */ |
346 | #define FRAME_ARGS_SKIP 8 |
347 | |
348 | /* Put here the code to store, into a struct frame_saved_regs, |
349 | the addresses of the saved registers of frame described by FRAME_INFO. |
350 | This includes special registers such as pc and fp saved in special |
351 | ways in the stack frame. sp is even more special: |
352 | the address we return for it IS the sp for the next frame. */ |
353 | |
354 | #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \ |
355 | { \ |
356 | bzero (&frame_saved_regs, sizeof frame_saved_regs); \ |
357 | (frame_saved_regs).regs[PC_REGNUM] = (frame_info).frame + 8; \ |
358 | (frame_saved_regs).regs[R4_REGNUM] = (frame_info).frame + 0x30; \ |
359 | (frame_saved_regs).regs[R5_REGNUM] = (frame_info).frame + 0x34; \ |
360 | (frame_saved_regs).regs[R6_REGNUM] = (frame_info).frame + 0x38; \ |
361 | (frame_saved_regs).regs[R7_REGNUM] = (frame_info).frame + 0x3C; \ |
362 | } |
363 | \f |
364 | /* Things needed for making the inferior call functions. */ |
365 | |
366 | /* Push an empty stack frame, to record the current PC, etc. */ |
367 | |
368 | #define PUSH_DUMMY_FRAME \ |
369 | { register CORE_ADDR sp = read_register (SP_REGNUM); \ |
370 | register int regnum; \ |
371 | sp = push_word (sp, read_register (PC_REGNUM)); \ |
372 | sp = push_word (sp, read_register (FP_REGNUM)); \ |
373 | write_register (FP_REGNUM, sp); \ |
374 | for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--) \ |
375 | sp = push_word (sp, read_register (regnum)); \ |
376 | sp = push_word (sp, read_register (PS_REGNUM)); \ |
377 | write_register (SP_REGNUM, sp); } |
378 | |
379 | /* Discard from the stack the innermost frame, |
380 | restoring all saved registers. */ |
381 | |
382 | #define POP_FRAME \ |
383 | { register CORE_ADDR fp = read_register (FP_REGNUM); \ |
384 | register int regnum; \ |
385 | struct frame_saved_regs fsr; \ |
386 | struct frame_info fi; \ |
387 | fi = get_frame_info (fp); \ |
388 | get_frame_saved_regs (&fi, &fsr); \ |
389 | for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--) \ |
390 | if (fsr.regs[regnum]) \ |
391 | write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \ |
392 | if (fsr.regs[PS_REGNUM]) \ |
393 | write_register (PS_REGNUM, read_memory_integer (fsr.regs[PS_REGNUM], 4)); \ |
394 | write_register (FP_REGNUM, read_memory_integer (fp, 4)); \ |
395 | write_register (PC_REGNUM, read_memory_integer (fp + 4, 4)); \ |
396 | write_register (SP_REGNUM, fp + 8); \ |
397 | set_current_frame (read_register (FP_REGNUM)); } |
398 | |
399 | /* This sequence of words is the instructions: |
400 | halt |
401 | halt |
402 | halt |
403 | halt |
404 | suabr b2, #<stacksize> |
405 | lwbr b6, #con |
406 | stw r1, 8(b2) - save caller address, do we care? |
407 | lw r2, 60(b2) - arg1 |
408 | labr b3, 50(b2) |
409 | std r4, 30(b2) - save r4-r7 |
410 | std r6, 38(b2) |
411 | lwbr b1, #<func> - load function call address |
412 | brlnk r1, 8(b1) - call function |
413 | halt |
414 | halt |
415 | ld r4, 30(b2) - restore r4-r7 |
416 | ld r6, 38(b2) |
417 | |
418 | Setup our stack frame, load argumemts, call and then restore registers. |
419 | */ |
420 | |
421 | #define CALL_DUMMY {0xf227e0ff, 0x48e7fffc, 0x426742e7, 0x4eb93232, 0x3232dffc, 0x69696969, 0x4e4f4e71} |
422 | |
423 | #define CALL_DUMMY_LENGTH 28 |
424 | |
425 | #define CALL_DUMMY_START_OFFSET 12 |
426 | |
427 | /* Insert the specified number of args and function address |
428 | into a call sequence of the above form stored at DUMMYNAME. */ |
429 | |
430 | #define FIX_CALL_DUMMY(dummyname, fun, nargs) \ |
431 | { *(int *)((char *) dummyname + 20) = nargs * 4; \ |
432 | *(int *)((char *) dummyname + 14) = fun; } |
433 | \f |
434 | /* |
435 | * No KDB support, Yet! */ |
436 | /* Interface definitions for kernel debugger KDB. */ |
437 | |
438 | /* Map machine fault codes into signal numbers. |
439 | First subtract 0, divide by 4, then index in a table. |
440 | Faults for which the entry in this table is 0 |
441 | are not handled by KDB; the program's own trap handler |
442 | gets to handle then. */ |
443 | |
444 | #define FAULT_CODE_ORIGIN 0 |
445 | #define FAULT_CODE_UNITS 4 |
446 | #define FAULT_TABLE \ |
447 | { 0, 0, 0, 0, SIGTRAP, 0, 0, 0, \ |
448 | 0, SIGTRAP, 0, 0, 0, 0, 0, SIGKILL, \ |
449 | 0, 0, 0, 0, 0, 0, 0, 0, \ |
450 | SIGILL } |
451 | |
452 | /* Start running with a stack stretching from BEG to END. |
453 | BEG and END should be symbols meaningful to the assembler. |
454 | This is used only for kdb. */ |
455 | |
456 | #define INIT_STACK(beg, end) \ |
457 | { asm (".globl end"); \ |
458 | asm ("movel $ end, sp"); \ |
459 | asm ("clrl fp"); } |
460 | |
461 | /* Push the frame pointer register on the stack. */ |
462 | #define PUSH_FRAME_PTR \ |
463 | asm ("movel fp, -(sp)"); |
464 | |
465 | /* Copy the top-of-stack to the frame pointer register. */ |
466 | #define POP_FRAME_PTR \ |
467 | asm ("movl (sp), fp"); |
468 | |
469 | /* After KDB is entered by a fault, push all registers |
470 | that GDB thinks about (all NUM_REGS of them), |
471 | so that they appear in order of ascending GDB register number. |
472 | The fault code will be on the stack beyond the last register. */ |
473 | |
474 | #define PUSH_REGISTERS \ |
475 | { asm ("clrw -(sp)"); \ |
476 | asm ("pea 10(sp)"); \ |
477 | asm ("movem $ 0xfffe,-(sp)"); } |
478 | |
479 | /* Assuming the registers (including processor status) have been |
480 | pushed on the stack in order of ascending GDB register number, |
481 | restore them and return to the address in the saved PC register. */ |
482 | |
483 | #define POP_REGISTERS \ |
484 | { asm ("subil $8,28(sp)"); \ |
485 | asm ("movem (sp),$ 0xffff"); \ |
486 | asm ("rte"); } |