1 /* Definitions to make GDB run on Convex Unix (4bsd)
2 Copyright (C) 1989 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 /* I don't know if this will work for cross-debugging, even if you do get
24 /* Include certain files for dbxread.c */
25 #include <convex/filehdr.h>
26 #include <convex/opthdr.h>
27 #include <convex/scnhdr.h>
30 /* Define this if the C compiler puts an underscore at the front
31 of external names before giving them to the linker. */
33 #define NAMES_HAVE_UNDERSCORE
35 /* Debugger information will be in DBX format. */
37 #define READ_DBX_FORMAT
39 /* There is come problem with the debugging symbols generated by the
40 compiler such that the debugging symbol for the first line of a
41 function overlap with the function prologue. */
42 #define PROLOGUE_FIRSTLINE_OVERLAP
44 /* When convex pcc says CHAR or SHORT, it provides the correct address. */
46 #define BELIEVE_PCC_PROMOTION 1
48 /* Symbol types to ignore. */
49 /* 0xc4 is N_MONPT. Use the numeric value for the benefit of people
50 with (rather) old OS's. */
51 #define IGNORE_SYMBOL(TYPE) \
52 (((TYPE) & ~N_EXT) == N_TBSS \
53 || ((TYPE) & ~N_EXT) == N_TDATA \
54 || ((TYPE) & ~N_EXT) == 0xc4)
56 /* Offset from address of function to start of its code.
57 Zero on most machines. */
59 #define FUNCTION_START_OFFSET 0
61 /* Advance PC across any function entry prologue instructions
62 to reach some "real" code.
64 [sub.w #-,sp] in one of 3 possible sizes
65 [mov psw,- fc/vc main program prolog
66 and #-,- (skip it because the "mov psw" saves the
67 mov -,psw] T bit, so continue gets a surprise trap)
68 [and #-,sp] fc/vc O2 main program prolog
69 [ld.- -(ap),-] pcc/gcc register arg loads
72 #define SKIP_PROLOGUE(pc) \
74 op = read_memory_integer (pc, 2); \
75 if ((op & 0xffc7) == 0x5ac0) pc += 2; \
76 else if (op == 0x1580) pc += 4; \
77 else if (op == 0x15c0) pc += 6; \
78 if ((read_memory_integer (pc, 2) & 0xfff8) == 0x7c40 \
79 && (read_memory_integer (pc + 2, 2) & 0xfff8) == 0x1240 \
80 && (read_memory_integer (pc + 8, 2) & 0xfff8) == 0x7c48) \
82 if (read_memory_integer (pc, 2) == 0x1240) pc += 6; \
84 op = read_memory_integer (pc, 2); \
87 if ((op & 0xfcc0) == 0x3000) pc += 4; \
88 else if ((op & 0xfcc0) == 0x3040) pc += 6; \
89 else if ((op & 0xfcc0) == 0x2800) pc += 4; \
90 else if ((op & 0xfcc0) == 0x2840) pc += 6; \
93 /* Immediately after a function call, return the saved pc.
94 (ignore frame and return *$sp so we can handle both calls and callq) */
96 #define SAVED_PC_AFTER_CALL(frame) \
97 read_memory_integer (read_register (SP_REGNUM), 4)
99 /* Address of end of stack space.
100 This is ((USRSTACK + 0xfff) & -0x1000)) from <convex/vmparam.h> but
101 that expression depends on the kernel version; instead, fetch a
102 page-zero pointer and get it from that. This will be invalid if
103 they ever change the way bkpt signals are delivered. */
105 #define STACK_END_ADDR (0xfffff000 & *(unsigned *) 0x80000050)
107 /* User-mode traps push an extended rtn block,
108 then fault with one of the following PCs */
110 #define is_trace_pc(pc) ((unsigned) ((pc) - (*(int *) 0x80000040)) <= 4)
111 #define is_arith_pc(pc) ((unsigned) ((pc) - (*(int *) 0x80000044)) <= 4)
112 #define is_break_pc(pc) ((unsigned) ((pc) - (*(int *) 0x80000050)) <= 4)
114 /* We need to manipulate trap bits in the psw */
116 #define PSW_TRAP_FLAGS 0x69670000
117 #define PSW_T_BIT 0x08000000
118 #define PSW_S_BIT 0x01000000
120 /* Stack grows downward. */
124 /* Sequence of bytes for breakpoint instruction. (bkpt) */
126 #define BREAKPOINT {0x7d,0x50}
128 /* Amount PC must be decremented by after a breakpoint.
129 This is often the number of bytes in BREAKPOINT but not always.
130 (The break PC needs to be decremented by 2, but we do it when the
131 break frame is recognized and popped. That way gdb can tell breaks
132 from trace traps with certainty.) */
134 #define DECR_PC_AFTER_BREAK 0
136 /* Nonzero if instruction at PC is a return instruction. (rtn or rtnq) */
138 #define ABOUT_TO_RETURN(pc) \
139 ((read_memory_integer (pc, 2) & 0xffe0) == 0x7c80)
141 /* Return 1 if P points to an invalid floating point value. */
143 #define INVALID_FLOAT(p,len) 0
145 /* Say how long (ordinary) registers are. */
147 #define REGISTER_TYPE long long
149 /* Number of machine registers */
153 /* Initializer for an array of names of registers.
154 There should be NUM_REGS strings in this initializer. */
156 #define REGISTER_NAMES {"pc","psw","fp","ap","a5","a4","a3","a2","a1","sp",\
157 "s7","s6","s5","s4","s3","s2","s1","s0",\
158 "S7","S6","S5","S4","S3","S2","S1","S0"}
160 /* Register numbers of various important registers.
161 Note that some of these values are "real" register numbers,
162 and correspond to the general registers of the machine,
163 and some are "phony" register numbers which are too large
164 to be actual register numbers as far as the user is concerned
165 but do serve to get the desired values when passed to read_register. */
167 #define S0_REGNUM 25 /* the real S regs */
169 #define s0_REGNUM 17 /* low-order halves of S regs */
171 #define SP_REGNUM 9 /* A regs */
175 #define FP_REGNUM 2 /* Contains address of executing stack frame */
176 #define PS_REGNUM 1 /* Contains processor status */
177 #define PC_REGNUM 0 /* Contains program counter */
179 /* convert dbx stab register number (from `r' declaration) to a gdb REGNUM */
181 #define STAB_REG_TO_REGNUM(value) \
182 ((value) < 8 ? S0_REGNUM - (value) : SP_REGNUM - ((value) - 8))
184 /* Vector register numbers, not handled as ordinary regs.
185 They are treated as convenience variables whose values are read
186 from the inferior when needed. */
194 /* Total amount of space needed to store our copies of the machine's
195 register state, the array `registers'. */
196 #define REGISTER_BYTES (4*10 + 8*8)
198 /* Index within `registers' of the first byte of the space for
200 NB: must match structure of struct syscall_context for correct operation */
202 #define REGISTER_BYTE(N) ((N) < s7_REGNUM ? 4*(N) : \
203 (N) < S7_REGNUM ? 44 + 8 * ((N)-s7_REGNUM) : \
204 40 + 8 * ((N)-S7_REGNUM))
206 /* Number of bytes of storage in the actual machine representation
209 #define REGISTER_RAW_SIZE(N) ((N) < S7_REGNUM ? 4 : 8)
211 /* Number of bytes of storage in the program's representation
214 #define REGISTER_VIRTUAL_SIZE(N) REGISTER_RAW_SIZE(N)
216 /* Largest value REGISTER_RAW_SIZE can have. */
218 #define MAX_REGISTER_RAW_SIZE 8
220 /* Largest value REGISTER_VIRTUAL_SIZE can have. */
222 #define MAX_REGISTER_VIRTUAL_SIZE 8
224 /* Nonzero if register N requires conversion
225 from raw format to virtual format. */
227 #define REGISTER_CONVERTIBLE(N) 0
229 /* Convert data from raw format for register REGNUM
230 to virtual format for register REGNUM. */
232 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
233 bcopy ((FROM), (TO), REGISTER_RAW_SIZE (REGNUM));
235 /* Convert data from virtual format for register REGNUM
236 to raw format for register REGNUM. */
238 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
239 bcopy ((FROM), (TO), REGISTER_RAW_SIZE (REGNUM));
241 /* Return the GDB type object for the "standard" data type
242 of data in register N. */
244 #define REGISTER_VIRTUAL_TYPE(N) \
245 ((N) < S7_REGNUM ? builtin_type_int : builtin_type_long_long)
247 /* Store the address of the place in which to copy the structure the
248 subroutine will return. This is called from call_function. */
250 #define STORE_STRUCT_RETURN(ADDR, SP) \
251 { write_register (A1_REGNUM, (ADDR)); }
253 /* Extract from an array REGBUF containing the (raw) register state
254 a function return value of type TYPE, and copy that, in virtual format,
257 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
258 bcopy (&((char *) REGBUF) [REGISTER_BYTE (S0_REGNUM) + \
259 8 - TYPE_LENGTH (TYPE)],\
260 VALBUF, TYPE_LENGTH (TYPE))
262 /* Write into appropriate registers a function return value
263 of type TYPE, given in virtual format. */
265 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
266 write_register_bytes (REGISTER_BYTE (S0_REGNUM), VALBUF, 8)
268 /* Extract from an array REGBUF containing the (raw) register state
269 the address in which a function should return its structure value,
270 as a CORE_ADDR (or an expression that can be used as one). */
272 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \
273 (*(int *) & ((char *) REGBUF) [REGISTER_BYTE (s0_REGNUM)])
275 /* Define trapped internal variable hooks to read and write
276 vector and communication registers. */
278 #define IS_TRAPPED_INTERNALVAR is_trapped_internalvar
279 #define VALUE_OF_TRAPPED_INTERNALVAR value_of_trapped_internalvar
280 #define SET_TRAPPED_INTERNALVAR set_trapped_internalvar
282 extern struct value *value_of_trapped_internalvar ();
284 /* Hooks to read data from soff exec and core files,
285 and to describe the files. */
287 #define XFER_CORE_FILE
288 #define FILES_INFO_HOOK print_maps
290 /* Hook to call to print a typeless integer value, normally printed in decimal.
291 For convex, use hex instead if the number looks like an address. */
293 #define PRINT_TYPELESS_INTEGER decout
295 /* For the native compiler, variables for a particular lexical context
296 are listed after the beginning LBRAC instead of before in the
297 executables list of symbols. Using "gcc_compiled." to distinguish
298 between GCC and native compiler doesn't work on Convex because the
299 linker sorts the symbols to put "gcc_compiled." in the wrong place.
300 desc is nonzero for native, zero for gcc. */
301 #define VARIABLES_INSIDE_BLOCK(desc, gcc_p) (desc != 0)
303 /* Pcc occaisionally puts an SO where there should be an SOL. */
304 #define PCC_SOL_BROKEN
306 /* Cannot execute with pc on the stack. */
307 #define CANNOT_EXECUTE_STACK
309 /* Describe the pointer in each stack frame to the previous stack frame
312 /* FRAME_CHAIN takes a frame_info with a frame's nominal address in fi->frame,
313 and produces the frame's chain-pointer.
315 FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address
316 and produces the nominal address of the caller frame.
318 However, if FRAME_CHAIN_VALID returns zero,
319 it means the given frame is the outermost one and has no caller.
320 In that case, FRAME_CHAIN_COMBINE is not used. */
322 /* (caller fp is saved at 8(fp)) */
324 #define FRAME_CHAIN(fi) (read_memory_integer ((fi)->frame + 8, 4))
326 #define FRAME_CHAIN_VALID(chain, thisframe) \
327 (chain != 0 && (outside_startup_file (FRAME_SAVED_PC (thisframe))))
329 #define FRAME_CHAIN_COMBINE(chain, thisframe) (chain)
331 /* Define other aspects of the stack frame. */
333 /* A macro that tells us whether the function invocation represented
334 by FI does not have a frame on the stack associated with it. If it
335 does not, FRAMELESS is set to 1, else 0.
336 On convex, check at the return address for `callq' -- if so, frameless,
339 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
341 extern CORE_ADDR text_start, text_end; \
342 CORE_ADDR call_addr = SAVED_PC_AFTER_CALL (FI); \
343 (FRAMELESS) = (call_addr >= text_start && call_addr < text_end \
344 && read_memory_integer (call_addr - 6, 1) == 0x22); \
347 #define FRAME_SAVED_PC(fi) (read_memory_integer ((fi)->frame, 4))
349 #define FRAME_ARGS_ADDRESS(fi) (read_memory_integer ((fi)->frame + 12, 4))
351 #define FRAME_LOCALS_ADDRESS(fi) (fi)->frame
353 /* Return number of args passed to a frame.
354 Can return -1, meaning no way to tell. */
356 #define FRAME_NUM_ARGS(numargs, fi) \
357 { numargs = read_memory_integer (FRAME_ARGS_ADDRESS (fi) - 4, 4); \
358 if (numargs < 0 || numargs >= 256) numargs = -1;}
360 /* Return number of bytes at start of arglist that are not really args. */
362 #define FRAME_ARGS_SKIP 0
364 /* Put here the code to store, into a struct frame_saved_regs,
365 the addresses of the saved registers of frame described by FRAME_INFO.
366 This includes special registers such as pc and fp saved in special
367 ways in the stack frame. sp is even more special:
368 the address we return for it IS the sp for the next frame. */
370 /* Normal (short) frames save only PC, FP, (callee's) AP. To reasonably
371 handle gcc and pcc register variables, scan the code following the
372 call for the instructions the compiler inserts to reload register
373 variables from stack slots and record the stack slots as the saved
374 locations of those registers. This will occasionally identify some
375 random load as a saved register; this is harmless. vc does not
376 declare its register allocation actions in the stabs. */
378 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
379 { register int regnum; \
380 register int frame_length = /* 3 short, 2 long, 1 extended, 0 context */\
381 (read_memory_integer ((frame_info)->frame + 4, 4) >> 25) & 3; \
382 register CORE_ADDR frame_fp = \
383 read_memory_integer ((frame_info)->frame + 8, 4); \
384 register CORE_ADDR next_addr; \
385 bzero (&frame_saved_regs, sizeof frame_saved_regs); \
386 (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 0; \
387 (frame_saved_regs).regs[PS_REGNUM] = (frame_info)->frame + 4; \
388 (frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame + 8; \
389 (frame_saved_regs).regs[AP_REGNUM] = frame_fp + 12; \
390 next_addr = (frame_info)->frame + 12; \
391 if (frame_length < 3) \
392 for (regnum = A5_REGNUM; regnum < SP_REGNUM; ++regnum) \
393 (frame_saved_regs).regs[regnum] = (next_addr += 4); \
394 if (frame_length < 2) \
395 (frame_saved_regs).regs[SP_REGNUM] = (next_addr += 4); \
397 if (frame_length < 3) \
398 for (regnum = S7_REGNUM; regnum < S0_REGNUM; ++regnum) \
399 (frame_saved_regs).regs[regnum] = (next_addr += 8); \
400 if (frame_length < 2) \
401 (frame_saved_regs).regs[S0_REGNUM] = (next_addr += 8); \
403 (frame_saved_regs).regs[SP_REGNUM] = next_addr + 8; \
404 if (frame_length == 3) { \
405 CORE_ADDR pc = read_memory_integer ((frame_info)->frame, 4); \
407 op = read_memory_integer (pc, 2); \
408 if ((op & 0xffc7) == 0x1480) pc += 4; /* add.w #-,sp */ \
409 else if ((op & 0xffc7) == 0x58c0) pc += 2; /* add.w #-,sp */ \
410 op = read_memory_integer (pc, 2); \
411 if ((op & 0xffc7) == 0x2a06) pc += 4; /* ld.w -,ap */ \
413 op = read_memory_integer (pc, 2); \
414 ix = (op >> 3) & 7; \
415 if ((op & 0xfcc0) == 0x2800) { /* ld.- -,ak */ \
416 regnum = SP_REGNUM - (op & 7); \
417 disp = read_memory_integer (pc + 2, 2); \
419 else if ((op & 0xfcc0) == 0x2840) { /* ld.- -,ak */ \
420 regnum = SP_REGNUM - (op & 7); \
421 disp = read_memory_integer (pc + 2, 4); \
423 if ((op & 0xfcc0) == 0x3000) { /* ld.- -,sk */ \
424 regnum = S0_REGNUM - (op & 7); \
425 disp = read_memory_integer (pc + 2, 2); \
427 else if ((op & 0xfcc0) == 0x3040) { /* ld.- -,sk */ \
428 regnum = S0_REGNUM - (op & 7); \
429 disp = read_memory_integer (pc + 2, 4); \
431 else if ((op & 0xff00) == 0x7100) { /* br crossjump */ \
432 pc += 2 * (char) op; \
434 else if (op == 0x0140) { /* jmp crossjump */ \
435 pc = read_memory_integer (pc + 2, 4); \
438 if ((frame_saved_regs).regs[regnum]) \
440 if (ix == 7) disp += frame_fp; \
441 else if (ix == 6) disp += read_memory_integer (frame_fp + 12, 4); \
442 else if (ix != 0) break; \
443 (frame_saved_regs).regs[regnum] = \
444 disp - 8 + (1 << ((op >> 8) & 3)); \
445 if (regnum >= S7_REGNUM) \
446 (frame_saved_regs).regs[regnum - S0_REGNUM + s0_REGNUM] = \
447 disp - 4 + (1 << ((op >> 8) & 3)); \
452 /* Things needed for making the inferior call functions. */
454 /* Push an empty stack frame, to record the current PC, etc. */
456 #define PUSH_DUMMY_FRAME \
457 { register CORE_ADDR sp = read_register (SP_REGNUM); \
458 register int regnum; \
461 for (regnum = S0_REGNUM; regnum >= S7_REGNUM; --regnum) { \
462 read_register_bytes (REGISTER_BYTE (regnum), buf, 8); \
463 sp = push_bytes (sp, buf, 8);} \
464 for (regnum = SP_REGNUM; regnum >= FP_REGNUM; --regnum) { \
465 word = read_register (regnum); \
466 sp = push_bytes (sp, &word, 4);} \
467 word = (read_register (PS_REGNUM) &~ (3<<25)) | (1<<25); \
468 sp = push_bytes (sp, &word, 4); \
469 word = read_register (PC_REGNUM); \
470 sp = push_bytes (sp, &word, 4); \
471 write_register (SP_REGNUM, sp); \
472 write_register (FP_REGNUM, sp); \
473 write_register (AP_REGNUM, sp);}
475 /* Discard from the stack the innermost frame, restoring all registers. */
477 #define POP_FRAME do {\
478 register CORE_ADDR fp = read_register (FP_REGNUM); \
479 register int regnum; \
480 register int frame_length = /* 3 short, 2 long, 1 extended, 0 context */ \
481 (read_memory_integer (fp + 4, 4) >> 25) & 3; \
483 write_register (PC_REGNUM, read_memory_integer (fp, 4)); \
484 write_register (PS_REGNUM, read_memory_integer (fp += 4, 4)); \
485 write_register (FP_REGNUM, read_memory_integer (fp += 4, 4)); \
486 write_register (AP_REGNUM, read_memory_integer (fp += 4, 4)); \
487 if (frame_length < 3) \
488 for (regnum = A5_REGNUM; regnum < SP_REGNUM; ++regnum) \
489 write_register (regnum, read_memory_integer (fp += 4, 4)); \
490 if (frame_length < 2) \
491 write_register (SP_REGNUM, read_memory_integer (fp += 4, 4)); \
493 if (frame_length < 3) \
494 for (regnum = S7_REGNUM; regnum < S0_REGNUM; ++regnum) { \
495 read_memory (fp += 8, buf, 8); \
496 write_register_bytes (REGISTER_BYTE (regnum), buf, 8);} \
497 if (frame_length < 2) { \
498 read_memory (fp += 8, buf, 8); \
499 write_register_bytes (REGISTER_BYTE (regnum), buf, 8);} \
500 else write_register (SP_REGNUM, fp + 8); \
501 flush_cached_frames (); \
502 set_current_frame (create_new_frame (read_register (FP_REGNUM), \
506 /* This sequence of words is the instructions
511 Note this is 16 bytes. */
513 #define CALL_DUMMY {0x50860d4069696969LL,0x2140323232327d50LL}
515 #define CALL_DUMMY_LENGTH 16
517 #define CALL_DUMMY_START_OFFSET 0
519 /* Insert the specified number of args and function address
520 into a call sequence of the above form stored at DUMMYNAME. */
522 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
523 { *(int *)((char *) dummyname + 4) = nargs; \
524 *(int *)((char *) dummyname + 10) = fun; }
526 /* Defs to read soff symbol tables, see dbxread.c */
528 #define NUMBER_OF_SYMBOLS ((long) opthdr.o_nsyms)
529 #define STRING_TABLE_OFFSET ((long) filehdr.h_strptr)
530 #define SYMBOL_TABLE_OFFSET ((long) opthdr.o_symptr)
531 #define STRING_TABLE_SIZE ((long) filehdr.h_strsiz)
532 #define SIZE_OF_TEXT_SEGMENT ((long) txthdr.s_size)
533 #define ENTRY_POINT ((long) opthdr.o_entry)
535 #define READ_STRING_TABLE_SIZE(BUFFER) \
536 (BUFFER = STRING_TABLE_SIZE)
538 #define DECLARE_FILE_HEADERS \
543 #define READ_FILE_HEADERS(DESC,NAME) \
546 val = myread (DESC, &filehdr, sizeof filehdr); \
548 perror_with_name (NAME); \
549 if (! IS_SOFF_MAGIC (filehdr.h_magic)) \
550 error ("%s: not an executable file.", NAME); \
551 lseek (DESC, 0L, 0); \
552 if (myread (DESC, &filehdr, sizeof filehdr) < 0) \
553 perror_with_name (NAME); \
554 if (myread (DESC, &opthdr, filehdr.h_opthdr) <= 0) \
555 perror_with_name (NAME); \
556 for (n = 0; n < filehdr.h_nscns; n++) \
558 if (myread (DESC, &txthdr, sizeof txthdr) < 0) \
559 perror_with_name (NAME); \
560 if ((txthdr.s_flags & S_TYPMASK) == S_TEXT) \