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 /* 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 /* There is come problem with the debugging symbols generated by the
36 compiler such that the debugging symbol for the first line of a
37 function overlap with the function prologue. */
38 #define PROLOGUE_FIRSTLINE_OVERLAP
40 /* When convex pcc says CHAR or SHORT, it provides the correct address. */
42 #define BELIEVE_PCC_PROMOTION 1
44 /* Symbol types to ignore. */
45 /* 0xc4 is N_MONPT. Use the numeric value for the benefit of people
46 with (rather) old OS's. */
47 #define IGNORE_SYMBOL(TYPE) \
48 (((TYPE) & ~N_EXT) == N_TBSS \
49 || ((TYPE) & ~N_EXT) == N_TDATA \
50 || ((TYPE) & ~N_EXT) == 0xc4)
52 /* Offset from address of function to start of its code.
53 Zero on most machines. */
55 #define FUNCTION_START_OFFSET 0
57 /* Advance PC across any function entry prologue instructions
58 to reach some "real" code.
60 [sub.w #-,sp] in one of 3 possible sizes
61 [mov psw,- fc/vc main program prolog
62 and #-,- (skip it because the "mov psw" saves the
63 mov -,psw] T bit, so continue gets a surprise trap)
64 [and #-,sp] fc/vc O2 main program prolog
65 [ld.- -(ap),-] pcc/gcc register arg loads
68 #define SKIP_PROLOGUE(pc) \
70 op = read_memory_integer (pc, 2); \
71 if ((op & 0xffc7) == 0x5ac0) pc += 2; \
72 else if (op == 0x1580) pc += 4; \
73 else if (op == 0x15c0) pc += 6; \
74 if ((read_memory_integer (pc, 2) & 0xfff8) == 0x7c40 \
75 && (read_memory_integer (pc + 2, 2) & 0xfff8) == 0x1240 \
76 && (read_memory_integer (pc + 8, 2) & 0xfff8) == 0x7c48) \
78 if (read_memory_integer (pc, 2) == 0x1240) pc += 6; \
80 op = read_memory_integer (pc, 2); \
83 if ((op & 0xfcc0) == 0x3000) pc += 4; \
84 else if ((op & 0xfcc0) == 0x3040) pc += 6; \
85 else if ((op & 0xfcc0) == 0x2800) pc += 4; \
86 else if ((op & 0xfcc0) == 0x2840) pc += 6; \
89 /* Immediately after a function call, return the saved pc.
90 (ignore frame and return *$sp so we can handle both calls and callq) */
92 #define SAVED_PC_AFTER_CALL(frame) \
93 read_memory_integer (read_register (SP_REGNUM), 4)
95 /* Address of end of stack space.
96 This is ((USRSTACK + 0xfff) & -0x1000)) from <convex/vmparam.h> but
97 that expression depends on the kernel version; instead, fetch a
98 page-zero pointer and get it from that. This will be invalid if
99 they ever change the way bkpt signals are delivered. */
101 #define STACK_END_ADDR (0xfffff000 & *(unsigned *) 0x80000050)
103 /* User-mode traps push an extended rtn block,
104 then fault with one of the following PCs */
106 #define is_trace_pc(pc) ((unsigned) ((pc) - (*(int *) 0x80000040)) <= 4)
107 #define is_arith_pc(pc) ((unsigned) ((pc) - (*(int *) 0x80000044)) <= 4)
108 #define is_break_pc(pc) ((unsigned) ((pc) - (*(int *) 0x80000050)) <= 4)
110 /* We need to manipulate trap bits in the psw */
112 #define PSW_TRAP_FLAGS 0x69670000
113 #define PSW_T_BIT 0x08000000
114 #define PSW_S_BIT 0x01000000
116 /* Stack grows downward. */
120 /* Sequence of bytes for breakpoint instruction. (bkpt) */
122 #define BREAKPOINT {0x7d,0x50}
124 /* Amount PC must be decremented by after a breakpoint.
125 This is often the number of bytes in BREAKPOINT but not always.
126 (The break PC needs to be decremented by 2, but we do it when the
127 break frame is recognized and popped. That way gdb can tell breaks
128 from trace traps with certainty.) */
130 #define DECR_PC_AFTER_BREAK 0
132 /* Nonzero if instruction at PC is a return instruction. (rtn or rtnq) */
134 #define ABOUT_TO_RETURN(pc) \
135 ((read_memory_integer (pc, 2) & 0xffe0) == 0x7c80)
137 /* Return 1 if P points to an invalid floating point value. */
139 #define INVALID_FLOAT(p,len) 0
141 /* Say how long (ordinary) registers are. */
143 #define REGISTER_TYPE long long
145 /* Number of machine registers */
149 /* Initializer for an array of names of registers.
150 There should be NUM_REGS strings in this initializer. */
152 #define REGISTER_NAMES {"pc","psw","fp","ap","a5","a4","a3","a2","a1","sp",\
153 "s7","s6","s5","s4","s3","s2","s1","s0",\
154 "S7","S6","S5","S4","S3","S2","S1","S0"}
156 /* Register numbers of various important registers.
157 Note that some of these values are "real" register numbers,
158 and correspond to the general registers of the machine,
159 and some are "phony" register numbers which are too large
160 to be actual register numbers as far as the user is concerned
161 but do serve to get the desired values when passed to read_register. */
163 #define S0_REGNUM 25 /* the real S regs */
165 #define s0_REGNUM 17 /* low-order halves of S regs */
167 #define SP_REGNUM 9 /* A regs */
171 #define FP_REGNUM 2 /* Contains address of executing stack frame */
172 #define PS_REGNUM 1 /* Contains processor status */
173 #define PC_REGNUM 0 /* Contains program counter */
175 /* convert dbx stab register number (from `r' declaration) to a gdb REGNUM */
177 #define STAB_REG_TO_REGNUM(value) \
178 ((value) < 8 ? S0_REGNUM - (value) : SP_REGNUM - ((value) - 8))
180 /* Vector register numbers, not handled as ordinary regs.
181 They are treated as convenience variables whose values are read
182 from the inferior when needed. */
190 /* Total amount of space needed to store our copies of the machine's
191 register state, the array `registers'. */
192 #define REGISTER_BYTES (4*10 + 8*8)
194 /* Index within `registers' of the first byte of the space for
196 NB: must match structure of struct syscall_context for correct operation */
198 #define REGISTER_BYTE(N) ((N) < s7_REGNUM ? 4*(N) : \
199 (N) < S7_REGNUM ? 44 + 8 * ((N)-s7_REGNUM) : \
200 40 + 8 * ((N)-S7_REGNUM))
202 /* Number of bytes of storage in the actual machine representation
205 #define REGISTER_RAW_SIZE(N) ((N) < S7_REGNUM ? 4 : 8)
207 /* Number of bytes of storage in the program's representation
210 #define REGISTER_VIRTUAL_SIZE(N) REGISTER_RAW_SIZE(N)
212 /* Largest value REGISTER_RAW_SIZE can have. */
214 #define MAX_REGISTER_RAW_SIZE 8
216 /* Largest value REGISTER_VIRTUAL_SIZE can have. */
218 #define MAX_REGISTER_VIRTUAL_SIZE 8
220 /* Nonzero if register N requires conversion
221 from raw format to virtual format. */
223 #define REGISTER_CONVERTIBLE(N) 0
225 /* Convert data from raw format for register REGNUM
226 to virtual format for register REGNUM. */
228 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
229 bcopy ((FROM), (TO), REGISTER_RAW_SIZE (REGNUM));
231 /* Convert data from virtual format for register REGNUM
232 to raw format for register REGNUM. */
234 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
235 bcopy ((FROM), (TO), REGISTER_RAW_SIZE (REGNUM));
237 /* Return the GDB type object for the "standard" data type
238 of data in register N. */
240 #define REGISTER_VIRTUAL_TYPE(N) \
241 ((N) < S7_REGNUM ? builtin_type_int : builtin_type_long_long)
243 /* Store the address of the place in which to copy the structure the
244 subroutine will return. This is called from call_function. */
246 #define STORE_STRUCT_RETURN(ADDR, SP) \
247 { write_register (A1_REGNUM, (ADDR)); }
249 /* Extract from an array REGBUF containing the (raw) register state
250 a function return value of type TYPE, and copy that, in virtual format,
253 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
254 bcopy (&((char *) REGBUF) [REGISTER_BYTE (S0_REGNUM) + \
255 8 - TYPE_LENGTH (TYPE)],\
256 VALBUF, TYPE_LENGTH (TYPE))
258 /* Write into appropriate registers a function return value
259 of type TYPE, given in virtual format. */
261 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
262 write_register_bytes (REGISTER_BYTE (S0_REGNUM), VALBUF, 8)
264 /* Extract from an array REGBUF containing the (raw) register state
265 the address in which a function should return its structure value,
266 as a CORE_ADDR (or an expression that can be used as one). */
268 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \
269 (*(int *) & ((char *) REGBUF) [REGISTER_BYTE (s0_REGNUM)])
271 /* Define trapped internal variable hooks to read and write
272 vector and communication registers. */
274 #define IS_TRAPPED_INTERNALVAR is_trapped_internalvar
275 #define VALUE_OF_TRAPPED_INTERNALVAR value_of_trapped_internalvar
276 #define SET_TRAPPED_INTERNALVAR set_trapped_internalvar
278 extern struct value *value_of_trapped_internalvar ();
280 /* Hooks to read data from soff exec and core files,
281 and to describe the files. */
283 #define XFER_CORE_FILE
284 #define FILES_INFO_HOOK print_maps
286 /* Hook to call to print a typeless integer value, normally printed in decimal.
287 For convex, use hex instead if the number looks like an address. */
289 #define PRINT_TYPELESS_INTEGER decout
291 /* For the native compiler, variables for a particular lexical context
292 are listed after the beginning LBRAC instead of before in the
293 executables list of symbols. Using "gcc_compiled." to distinguish
294 between GCC and native compiler doesn't work on Convex because the
295 linker sorts the symbols to put "gcc_compiled." in the wrong place.
296 desc is nonzero for native, zero for gcc. */
297 #define VARIABLES_INSIDE_BLOCK(desc, gcc_p) (desc != 0)
299 /* Pcc occaisionally puts an SO where there should be an SOL. */
300 #define PCC_SOL_BROKEN
302 /* Describe the pointer in each stack frame to the previous stack frame
305 /* FRAME_CHAIN takes a frame_info with a frame's nominal address in fi->frame,
306 and produces the frame's chain-pointer.
308 FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address
309 and produces the nominal address of the caller frame.
311 However, if FRAME_CHAIN_VALID returns zero,
312 it means the given frame is the outermost one and has no caller.
313 In that case, FRAME_CHAIN_COMBINE is not used. */
315 /* (caller fp is saved at 8(fp)) */
317 #define FRAME_CHAIN(fi) (read_memory_integer ((fi)->frame + 8, 4))
319 #define FRAME_CHAIN_VALID(chain, thisframe) \
320 (chain != 0 && (outside_startup_file (FRAME_SAVED_PC (thisframe))))
322 #define FRAME_CHAIN_COMBINE(chain, thisframe) (chain)
324 /* Define other aspects of the stack frame. */
326 /* We need the boundaries of the text in the exec file, as a kludge,
327 for FRAMELESS_FUNCTION_INVOCATION and CALL_DUMMY_LOCATION. */
329 #define NEED_TEXT_START_END
331 /* A macro that tells us whether the function invocation represented
332 by FI does not have a frame on the stack associated with it. If it
333 does not, FRAMELESS is set to 1, else 0.
334 On convex, check at the return address for `callq' -- if so, frameless,
337 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
339 extern CORE_ADDR text_start, text_end; \
340 CORE_ADDR call_addr = SAVED_PC_AFTER_CALL (FI); \
341 (FRAMELESS) = (call_addr >= text_start && call_addr < text_end \
342 && read_memory_integer (call_addr - 6, 1) == 0x22); \
345 #define FRAME_SAVED_PC(fi) (read_memory_integer ((fi)->frame, 4))
347 #define FRAME_ARGS_ADDRESS(fi) (read_memory_integer ((fi)->frame + 12, 4))
349 #define FRAME_LOCALS_ADDRESS(fi) (fi)->frame
351 /* Return number of args passed to a frame.
352 Can return -1, meaning no way to tell. */
354 #define FRAME_NUM_ARGS(numargs, fi) \
355 { numargs = read_memory_integer (FRAME_ARGS_ADDRESS (fi) - 4, 4); \
356 if (numargs < 0 || numargs >= 256) numargs = -1;}
358 /* Return number of bytes at start of arglist that are not really args. */
360 #define FRAME_ARGS_SKIP 0
362 /* Put here the code to store, into a struct frame_saved_regs,
363 the addresses of the saved registers of frame described by FRAME_INFO.
364 This includes special registers such as pc and fp saved in special
365 ways in the stack frame. sp is even more special:
366 the address we return for it IS the sp for the next frame. */
368 /* Normal (short) frames save only PC, FP, (callee's) AP. To reasonably
369 handle gcc and pcc register variables, scan the code following the
370 call for the instructions the compiler inserts to reload register
371 variables from stack slots and record the stack slots as the saved
372 locations of those registers. This will occasionally identify some
373 random load as a saved register; this is harmless. vc does not
374 declare its register allocation actions in the stabs. */
376 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
377 { register int regnum; \
378 register int frame_length = /* 3 short, 2 long, 1 extended, 0 context */\
379 (read_memory_integer ((frame_info)->frame + 4, 4) >> 25) & 3; \
380 register CORE_ADDR frame_fp = \
381 read_memory_integer ((frame_info)->frame + 8, 4); \
382 register CORE_ADDR next_addr; \
383 bzero (&frame_saved_regs, sizeof frame_saved_regs); \
384 (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 0; \
385 (frame_saved_regs).regs[PS_REGNUM] = (frame_info)->frame + 4; \
386 (frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame + 8; \
387 (frame_saved_regs).regs[AP_REGNUM] = frame_fp + 12; \
388 next_addr = (frame_info)->frame + 12; \
389 if (frame_length < 3) \
390 for (regnum = A5_REGNUM; regnum < SP_REGNUM; ++regnum) \
391 (frame_saved_regs).regs[regnum] = (next_addr += 4); \
392 if (frame_length < 2) \
393 (frame_saved_regs).regs[SP_REGNUM] = (next_addr += 4); \
395 if (frame_length < 3) \
396 for (regnum = S7_REGNUM; regnum < S0_REGNUM; ++regnum) \
397 (frame_saved_regs).regs[regnum] = (next_addr += 8); \
398 if (frame_length < 2) \
399 (frame_saved_regs).regs[S0_REGNUM] = (next_addr += 8); \
401 (frame_saved_regs).regs[SP_REGNUM] = next_addr + 8; \
402 if (frame_length == 3) { \
403 CORE_ADDR pc = read_memory_integer ((frame_info)->frame, 4); \
405 op = read_memory_integer (pc, 2); \
406 if ((op & 0xffc7) == 0x1480) pc += 4; /* add.w #-,sp */ \
407 else if ((op & 0xffc7) == 0x58c0) pc += 2; /* add.w #-,sp */ \
408 op = read_memory_integer (pc, 2); \
409 if ((op & 0xffc7) == 0x2a06) pc += 4; /* ld.w -,ap */ \
411 op = read_memory_integer (pc, 2); \
412 ix = (op >> 3) & 7; \
413 if ((op & 0xfcc0) == 0x2800) { /* ld.- -,ak */ \
414 regnum = SP_REGNUM - (op & 7); \
415 disp = read_memory_integer (pc + 2, 2); \
417 else if ((op & 0xfcc0) == 0x2840) { /* ld.- -,ak */ \
418 regnum = SP_REGNUM - (op & 7); \
419 disp = read_memory_integer (pc + 2, 4); \
421 if ((op & 0xfcc0) == 0x3000) { /* ld.- -,sk */ \
422 regnum = S0_REGNUM - (op & 7); \
423 disp = read_memory_integer (pc + 2, 2); \
425 else if ((op & 0xfcc0) == 0x3040) { /* ld.- -,sk */ \
426 regnum = S0_REGNUM - (op & 7); \
427 disp = read_memory_integer (pc + 2, 4); \
429 else if ((op & 0xff00) == 0x7100) { /* br crossjump */ \
430 pc += 2 * (char) op; \
432 else if (op == 0x0140) { /* jmp crossjump */ \
433 pc = read_memory_integer (pc + 2, 4); \
436 if ((frame_saved_regs).regs[regnum]) \
438 if (ix == 7) disp += frame_fp; \
439 else if (ix == 6) disp += read_memory_integer (frame_fp + 12, 4); \
440 else if (ix != 0) break; \
441 (frame_saved_regs).regs[regnum] = \
442 disp - 8 + (1 << ((op >> 8) & 3)); \
443 if (regnum >= S7_REGNUM) \
444 (frame_saved_regs).regs[regnum - S0_REGNUM + s0_REGNUM] = \
445 disp - 4 + (1 << ((op >> 8) & 3)); \
450 /* Things needed for making the inferior call functions. */
452 #define CALL_DUMMY_LOCATION BEFORE_TEXT_END
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) \