1 /* Definitions to make GDB run on Convex Unix (4bsd)
2 Copyright (C) 1989, 1991 Free Software Foundation, Inc.
4 This file is part of GDB.
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.
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.
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. */
20 #define TARGET_BYTE_ORDER BIG_ENDIAN
22 /* Define this if the C compiler puts an underscore at the front
23 of external names before giving them to the linker. */
25 #define NAMES_HAVE_UNDERSCORE
27 /* There is come problem with the debugging symbols generated by the
28 compiler such that the debugging symbol for the first line of a
29 function overlap with the function prologue. */
30 #define PROLOGUE_FIRSTLINE_OVERLAP
32 /* When convex pcc says CHAR or SHORT, it provides the correct address. */
34 #define BELIEVE_PCC_PROMOTION 1
36 /* Symbol types to ignore. */
37 /* 0xc4 is N_MONPT. Use the numeric value for the benefit of people
38 with (rather) old OS's. */
39 #define IGNORE_SYMBOL(TYPE) \
40 (((TYPE) & ~N_EXT) == N_TBSS \
41 || ((TYPE) & ~N_EXT) == N_TDATA \
42 || ((TYPE) & ~N_EXT) == 0xc4)
44 /* Offset from address of function to start of its code.
45 Zero on most machines. */
47 #define FUNCTION_START_OFFSET 0
49 /* Advance PC across any function entry prologue instructions
50 to reach some "real" code.
52 [sub.w #-,sp] in one of 3 possible sizes
53 [mov psw,- fc/vc main program prolog
54 and #-,- (skip it because the "mov psw" saves the
55 mov -,psw] T bit, so continue gets a surprise trap)
56 [and #-,sp] fc/vc O2 main program prolog
57 [ld.- -(ap),-] pcc/gcc register arg loads
60 #define SKIP_PROLOGUE(pc) \
62 op = read_memory_integer (pc, 2); \
63 if ((op & 0xffc7) == 0x5ac0) pc += 2; \
64 else if (op == 0x1580) pc += 4; \
65 else if (op == 0x15c0) pc += 6; \
66 if ((read_memory_integer (pc, 2) & 0xfff8) == 0x7c40 \
67 && (read_memory_integer (pc + 2, 2) & 0xfff8) == 0x1240 \
68 && (read_memory_integer (pc + 8, 2) & 0xfff8) == 0x7c48) \
70 if (read_memory_integer (pc, 2) == 0x1240) pc += 6; \
72 op = read_memory_integer (pc, 2); \
75 if ((op & 0xfcc0) == 0x3000) pc += 4; \
76 else if ((op & 0xfcc0) == 0x3040) pc += 6; \
77 else if ((op & 0xfcc0) == 0x2800) pc += 4; \
78 else if ((op & 0xfcc0) == 0x2840) pc += 6; \
81 /* Immediately after a function call, return the saved pc.
82 (ignore frame and return *$sp so we can handle both calls and callq) */
84 #define SAVED_PC_AFTER_CALL(frame) \
85 read_memory_integer (read_register (SP_REGNUM), 4)
87 /* Address of end of stack space.
88 This is ((USRSTACK + 0xfff) & -0x1000)) from <convex/vmparam.h> but
89 that expression depends on the kernel version; instead, fetch a
90 page-zero pointer and get it from that. This will be invalid if
91 they ever change the way bkpt signals are delivered. */
93 #define STACK_END_ADDR (0xfffff000 & *(unsigned *) 0x80000050)
95 /* User-mode traps push an extended rtn block,
96 then fault with one of the following PCs */
98 #define is_trace_pc(pc) ((unsigned) ((pc) - (*(int *) 0x80000040)) <= 4)
99 #define is_arith_pc(pc) ((unsigned) ((pc) - (*(int *) 0x80000044)) <= 4)
100 #define is_break_pc(pc) ((unsigned) ((pc) - (*(int *) 0x80000050)) <= 4)
102 /* We need to manipulate trap bits in the psw */
104 #define PSW_TRAP_FLAGS 0x69670000
105 #define PSW_T_BIT 0x08000000
106 #define PSW_S_BIT 0x01000000
108 /* Stack grows downward. */
112 /* Sequence of bytes for breakpoint instruction. (bkpt) */
114 #define BREAKPOINT {0x7d,0x50}
116 /* Amount PC must be decremented by after a breakpoint.
117 This is often the number of bytes in BREAKPOINT but not always.
118 (The break PC needs to be decremented by 2, but we do it when the
119 break frame is recognized and popped. That way gdb can tell breaks
120 from trace traps with certainty.) */
122 #define DECR_PC_AFTER_BREAK 0
124 /* Nonzero if instruction at PC is a return instruction. (rtn or rtnq) */
126 #define ABOUT_TO_RETURN(pc) \
127 ((read_memory_integer (pc, 2) & 0xffe0) == 0x7c80)
129 /* Return 1 if P points to an invalid floating point value. */
131 #define INVALID_FLOAT(p,len) 0
133 /* Say how long (ordinary) registers are. */
135 #define REGISTER_TYPE long long
137 /* Number of machine registers */
141 /* Initializer for an array of names of registers.
142 There should be NUM_REGS strings in this initializer. */
144 #define REGISTER_NAMES {"pc","psw","fp","ap","a5","a4","a3","a2","a1","sp",\
145 "s7","s6","s5","s4","s3","s2","s1","s0",\
146 "S7","S6","S5","S4","S3","S2","S1","S0"}
148 /* Register numbers of various important registers.
149 Note that some of these values are "real" register numbers,
150 and correspond to the general registers of the machine,
151 and some are "phony" register numbers which are too large
152 to be actual register numbers as far as the user is concerned
153 but do serve to get the desired values when passed to read_register. */
155 #define S0_REGNUM 25 /* the real S regs */
157 #define s0_REGNUM 17 /* low-order halves of S regs */
159 #define SP_REGNUM 9 /* A regs */
163 #define FP_REGNUM 2 /* Contains address of executing stack frame */
164 #define PS_REGNUM 1 /* Contains processor status */
165 #define PC_REGNUM 0 /* Contains program counter */
167 /* convert dbx stab register number (from `r' declaration) to a gdb REGNUM */
169 #define STAB_REG_TO_REGNUM(value) \
170 ((value) < 8 ? S0_REGNUM - (value) : SP_REGNUM - ((value) - 8))
172 /* Vector register numbers, not handled as ordinary regs.
173 They are treated as convenience variables whose values are read
174 from the inferior when needed. */
182 /* Total amount of space needed to store our copies of the machine's
183 register state, the array `registers'. */
184 #define REGISTER_BYTES (4*10 + 8*8)
186 /* Index within `registers' of the first byte of the space for
188 NB: must match structure of struct syscall_context for correct operation */
190 #define REGISTER_BYTE(N) ((N) < s7_REGNUM ? 4*(N) : \
191 (N) < S7_REGNUM ? 44 + 8 * ((N)-s7_REGNUM) : \
192 40 + 8 * ((N)-S7_REGNUM))
194 /* Number of bytes of storage in the actual machine representation
197 #define REGISTER_RAW_SIZE(N) ((N) < S7_REGNUM ? 4 : 8)
199 /* Number of bytes of storage in the program's representation
202 #define REGISTER_VIRTUAL_SIZE(N) REGISTER_RAW_SIZE(N)
204 /* Largest value REGISTER_RAW_SIZE can have. */
206 #define MAX_REGISTER_RAW_SIZE 8
208 /* Largest value REGISTER_VIRTUAL_SIZE can have. */
210 #define MAX_REGISTER_VIRTUAL_SIZE 8
212 /* Nonzero if register N requires conversion
213 from raw format to virtual format. */
215 #define REGISTER_CONVERTIBLE(N) 0
217 /* Convert data from raw format for register REGNUM
218 to virtual format for register REGNUM. */
220 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
221 bcopy ((FROM), (TO), REGISTER_RAW_SIZE (REGNUM));
223 /* Convert data from virtual format for register REGNUM
224 to raw format for register REGNUM. */
226 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
227 bcopy ((FROM), (TO), REGISTER_RAW_SIZE (REGNUM));
229 /* Return the GDB type object for the "standard" data type
230 of data in register N. */
232 #define REGISTER_VIRTUAL_TYPE(N) \
233 ((N) < S7_REGNUM ? builtin_type_int : builtin_type_long_long)
235 /* Store the address of the place in which to copy the structure the
236 subroutine will return. This is called from call_function. */
238 #define STORE_STRUCT_RETURN(ADDR, SP) \
239 { write_register (A1_REGNUM, (ADDR)); }
241 /* Extract from an array REGBUF containing the (raw) register state
242 a function return value of type TYPE, and copy that, in virtual format,
245 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
246 bcopy (&((char *) REGBUF) [REGISTER_BYTE (S0_REGNUM) + \
247 8 - TYPE_LENGTH (TYPE)],\
248 VALBUF, TYPE_LENGTH (TYPE))
250 /* Write into appropriate registers a function return value
251 of type TYPE, given in virtual format. */
253 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
254 write_register_bytes (REGISTER_BYTE (S0_REGNUM), VALBUF, 8)
256 /* Extract from an array REGBUF containing the (raw) register state
257 the address in which a function should return its structure value,
258 as a CORE_ADDR (or an expression that can be used as one). */
260 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \
261 (*(int *) & ((char *) REGBUF) [REGISTER_BYTE (s0_REGNUM)])
263 /* Define trapped internal variable hooks to read and write
264 vector and communication registers. */
266 #define IS_TRAPPED_INTERNALVAR is_trapped_internalvar
267 #define VALUE_OF_TRAPPED_INTERNALVAR value_of_trapped_internalvar
268 #define SET_TRAPPED_INTERNALVAR set_trapped_internalvar
270 extern struct value
*value_of_trapped_internalvar ();
272 /* Hooks to read data from soff exec and core files,
273 and to describe the files. */
275 #define XFER_CORE_FILE
276 #define FILES_INFO_HOOK print_maps
278 /* Hook to call to print a typeless integer value, normally printed in decimal.
279 For convex, use hex instead if the number looks like an address. */
281 #define PRINT_TYPELESS_INTEGER decout
283 /* For the native compiler, variables for a particular lexical context
284 are listed after the beginning LBRAC instead of before in the
285 executables list of symbols. Using "gcc_compiled." to distinguish
286 between GCC and native compiler doesn't work on Convex because the
287 linker sorts the symbols to put "gcc_compiled." in the wrong place.
288 desc is nonzero for native, zero for gcc. */
289 #define VARIABLES_INSIDE_BLOCK(desc, gcc_p) (desc != 0)
291 /* Pcc occaisionally puts an SO where there should be an SOL. */
292 #define PCC_SOL_BROKEN
294 /* Describe the pointer in each stack frame to the previous stack frame
297 /* FRAME_CHAIN takes a frame_info with a frame's nominal address in fi->frame,
298 and produces the frame's chain-pointer. */
300 /* (caller fp is saved at 8(fp)) */
302 #define FRAME_CHAIN(fi) (read_memory_integer ((fi)->frame + 8, 4))
304 /* Define other aspects of the stack frame. */
306 /* We need the boundaries of the text in the exec file, as a kludge,
307 for FRAMELESS_FUNCTION_INVOCATION and CALL_DUMMY_LOCATION. */
309 #define NEED_TEXT_START_END
311 /* A macro that tells us whether the function invocation represented
312 by FI does not have a frame on the stack associated with it. If it
313 does not, FRAMELESS is set to 1, else 0.
314 On convex, check at the return address for `callq' -- if so, frameless,
317 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
319 extern CORE_ADDR text_start, text_end; \
320 CORE_ADDR call_addr = SAVED_PC_AFTER_CALL (FI); \
321 (FRAMELESS) = (call_addr >= text_start && call_addr < text_end \
322 && read_memory_integer (call_addr - 6, 1) == 0x22); \
325 #define FRAME_SAVED_PC(fi) (read_memory_integer ((fi)->frame, 4))
327 #define FRAME_ARGS_ADDRESS(fi) (read_memory_integer ((fi)->frame + 12, 4))
329 #define FRAME_LOCALS_ADDRESS(fi) (fi)->frame
331 /* Return number of args passed to a frame.
332 Can return -1, meaning no way to tell. */
334 #define FRAME_NUM_ARGS(numargs, fi) \
335 { numargs = read_memory_integer (FRAME_ARGS_ADDRESS (fi) - 4, 4); \
336 if (numargs < 0 || numargs >= 256) numargs = -1;}
338 /* Return number of bytes at start of arglist that are not really args. */
340 #define FRAME_ARGS_SKIP 0
342 /* Put here the code to store, into a struct frame_saved_regs,
343 the addresses of the saved registers of frame described by FRAME_INFO.
344 This includes special registers such as pc and fp saved in special
345 ways in the stack frame. sp is even more special:
346 the address we return for it IS the sp for the next frame. */
348 /* Normal (short) frames save only PC, FP, (callee's) AP. To reasonably
349 handle gcc and pcc register variables, scan the code following the
350 call for the instructions the compiler inserts to reload register
351 variables from stack slots and record the stack slots as the saved
352 locations of those registers. This will occasionally identify some
353 random load as a saved register; this is harmless. vc does not
354 declare its register allocation actions in the stabs. */
356 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
357 { register int regnum; \
358 register int frame_length = /* 3 short, 2 long, 1 extended, 0 context */\
359 (read_memory_integer ((frame_info)->frame + 4, 4) >> 25) & 3; \
360 register CORE_ADDR frame_fp = \
361 read_memory_integer ((frame_info)->frame + 8, 4); \
362 register CORE_ADDR next_addr; \
363 bzero (&frame_saved_regs, sizeof frame_saved_regs); \
364 (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 0; \
365 (frame_saved_regs).regs[PS_REGNUM] = (frame_info)->frame + 4; \
366 (frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame + 8; \
367 (frame_saved_regs).regs[AP_REGNUM] = frame_fp + 12; \
368 next_addr = (frame_info)->frame + 12; \
369 if (frame_length < 3) \
370 for (regnum = A5_REGNUM; regnum < SP_REGNUM; ++regnum) \
371 (frame_saved_regs).regs[regnum] = (next_addr += 4); \
372 if (frame_length < 2) \
373 (frame_saved_regs).regs[SP_REGNUM] = (next_addr += 4); \
375 if (frame_length < 3) \
376 for (regnum = S7_REGNUM; regnum < S0_REGNUM; ++regnum) \
377 (frame_saved_regs).regs[regnum] = (next_addr += 8); \
378 if (frame_length < 2) \
379 (frame_saved_regs).regs[S0_REGNUM] = (next_addr += 8); \
381 (frame_saved_regs).regs[SP_REGNUM] = next_addr + 8; \
382 if (frame_length == 3) { \
383 CORE_ADDR pc = read_memory_integer ((frame_info)->frame, 4); \
385 op = read_memory_integer (pc, 2); \
386 if ((op & 0xffc7) == 0x1480) pc += 4; /* add.w #-,sp */ \
387 else if ((op & 0xffc7) == 0x58c0) pc += 2; /* add.w #-,sp */ \
388 op = read_memory_integer (pc, 2); \
389 if ((op & 0xffc7) == 0x2a06) pc += 4; /* ld.w -,ap */ \
391 op = read_memory_integer (pc, 2); \
392 ix = (op >> 3) & 7; \
393 if ((op & 0xfcc0) == 0x2800) { /* ld.- -,ak */ \
394 regnum = SP_REGNUM - (op & 7); \
395 disp = read_memory_integer (pc + 2, 2); \
397 else if ((op & 0xfcc0) == 0x2840) { /* ld.- -,ak */ \
398 regnum = SP_REGNUM - (op & 7); \
399 disp = read_memory_integer (pc + 2, 4); \
401 if ((op & 0xfcc0) == 0x3000) { /* ld.- -,sk */ \
402 regnum = S0_REGNUM - (op & 7); \
403 disp = read_memory_integer (pc + 2, 2); \
405 else if ((op & 0xfcc0) == 0x3040) { /* ld.- -,sk */ \
406 regnum = S0_REGNUM - (op & 7); \
407 disp = read_memory_integer (pc + 2, 4); \
409 else if ((op & 0xff00) == 0x7100) { /* br crossjump */ \
410 pc += 2 * (char) op; \
412 else if (op == 0x0140) { /* jmp crossjump */ \
413 pc = read_memory_integer (pc + 2, 4); \
416 if ((frame_saved_regs).regs[regnum]) \
418 if (ix == 7) disp += frame_fp; \
419 else if (ix == 6) disp += read_memory_integer (frame_fp + 12, 4); \
420 else if (ix != 0) break; \
421 (frame_saved_regs).regs[regnum] = \
422 disp - 8 + (1 << ((op >> 8) & 3)); \
423 if (regnum >= S7_REGNUM) \
424 (frame_saved_regs).regs[regnum - S0_REGNUM + s0_REGNUM] = \
425 disp - 4 + (1 << ((op >> 8) & 3)); \
430 /* Things needed for making the inferior call functions. */
432 #define CALL_DUMMY_LOCATION BEFORE_TEXT_END
434 /* Push an empty stack frame, to record the current PC, etc. */
436 #define PUSH_DUMMY_FRAME \
437 { register CORE_ADDR sp = read_register (SP_REGNUM); \
438 register int regnum; \
441 for (regnum = S0_REGNUM; regnum >= S7_REGNUM; --regnum) { \
442 read_register_bytes (REGISTER_BYTE (regnum), buf, 8); \
443 sp = push_bytes (sp, buf, 8);} \
444 for (regnum = SP_REGNUM; regnum >= FP_REGNUM; --regnum) { \
445 word = read_register (regnum); \
446 sp = push_bytes (sp, &word, 4);} \
447 word = (read_register (PS_REGNUM) &~ (3<<25)) | (1<<25); \
448 sp = push_bytes (sp, &word, 4); \
449 word = read_register (PC_REGNUM); \
450 sp = push_bytes (sp, &word, 4); \
451 write_register (SP_REGNUM, sp); \
452 write_register (FP_REGNUM, sp); \
453 write_register (AP_REGNUM, sp);}
455 /* Discard from the stack the innermost frame, restoring all registers. */
457 #define POP_FRAME do {\
458 register CORE_ADDR fp = read_register (FP_REGNUM); \
459 register int regnum; \
460 register int frame_length = /* 3 short, 2 long, 1 extended, 0 context */ \
461 (read_memory_integer (fp + 4, 4) >> 25) & 3; \
463 write_register (PC_REGNUM, read_memory_integer (fp, 4)); \
464 write_register (PS_REGNUM, read_memory_integer (fp += 4, 4)); \
465 write_register (FP_REGNUM, read_memory_integer (fp += 4, 4)); \
466 write_register (AP_REGNUM, read_memory_integer (fp += 4, 4)); \
467 if (frame_length < 3) \
468 for (regnum = A5_REGNUM; regnum < SP_REGNUM; ++regnum) \
469 write_register (regnum, read_memory_integer (fp += 4, 4)); \
470 if (frame_length < 2) \
471 write_register (SP_REGNUM, read_memory_integer (fp += 4, 4)); \
473 if (frame_length < 3) \
474 for (regnum = S7_REGNUM; regnum < S0_REGNUM; ++regnum) { \
475 read_memory (fp += 8, buf, 8); \
476 write_register_bytes (REGISTER_BYTE (regnum), buf, 8);} \
477 if (frame_length < 2) { \
478 read_memory (fp += 8, buf, 8); \
479 write_register_bytes (REGISTER_BYTE (regnum), buf, 8);} \
480 else write_register (SP_REGNUM, fp + 8); \
481 flush_cached_frames (); \
482 set_current_frame (create_new_frame (read_register (FP_REGNUM), \
486 /* This sequence of words is the instructions
491 Note this is 16 bytes. */
493 #define CALL_DUMMY {0x50860d4069696969LL,0x2140323232327d50LL}
495 #define CALL_DUMMY_LENGTH 16
497 #define CALL_DUMMY_START_OFFSET 0
499 /* Insert the specified number of args and function address
500 into a call sequence of the above form stored at DUMMYNAME. */
502 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
503 { *(int *)((char *) dummyname + 4) = nargs; \
504 *(int *)((char *) dummyname + 10) = fun; }
506 /* Defs to read soff symbol tables, see dbxread.c */
508 #define NUMBER_OF_SYMBOLS ((long) opthdr.o_nsyms)
509 #define STRING_TABLE_OFFSET ((long) filehdr.h_strptr)
510 #define SYMBOL_TABLE_OFFSET ((long) opthdr.o_symptr)
511 #define STRING_TABLE_SIZE ((long) filehdr.h_strsiz)
512 #define SIZE_OF_TEXT_SEGMENT ((long) txthdr.s_size)
513 #define ENTRY_POINT ((long) opthdr.o_entry)
515 #define READ_STRING_TABLE_SIZE(BUFFER) \
516 (BUFFER = STRING_TABLE_SIZE)
518 #define DECLARE_FILE_HEADERS \
523 #define READ_FILE_HEADERS(DESC,NAME) \
526 val = myread (DESC, &filehdr, sizeof filehdr); \
528 perror_with_name (NAME); \
529 if (! IS_SOFF_MAGIC (filehdr.h_magic)) \
530 error ("%s: not an executable file.", NAME); \
531 lseek (DESC, 0L, 0); \
532 if (myread (DESC, &filehdr, sizeof filehdr) < 0) \
533 perror_with_name (NAME); \
534 if (myread (DESC, &opthdr, filehdr.h_opthdr) <= 0) \
535 perror_with_name (NAME); \
536 for (n = 0; n < filehdr.h_nscns; n++) \
538 if (myread (DESC, &txthdr, sizeof txthdr) < 0) \
539 perror_with_name (NAME); \
540 if ((txthdr.s_flags & S_TYPMASK) == S_TEXT) \
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