1 /* Definitions to make GDB run on Convex Unix (4bsd)
2 Copyright 1989, 1991, 1993 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 /* There is come problem with the debugging symbols generated by the
23 compiler such that the debugging symbol for the first line of a
24 function overlap with the function prologue. */
25 #define PROLOGUE_FIRSTLINE_OVERLAP
27 /* When convex pcc says CHAR or SHORT, it provides the correct address. */
29 #define BELIEVE_PCC_PROMOTION 1
31 /* Symbol types to ignore. */
32 /* 0xc4 is N_MONPT. Use the numeric value for the benefit of people
33 with (rather) old OS's. */
34 #define IGNORE_SYMBOL(TYPE) \
35 (((TYPE) & ~N_EXT) == N_TBSS \
36 || ((TYPE) & ~N_EXT) == N_TDATA \
37 || ((TYPE) & ~N_EXT) == 0xc4)
39 /* Offset from address of function to start of its code.
40 Zero on most machines. */
42 #define FUNCTION_START_OFFSET 0
44 /* Advance PC across any function entry prologue instructions
45 to reach some "real" code.
47 [sub.w #-,sp] in one of 3 possible sizes
48 [mov psw,- fc/vc main program prolog
49 and #-,- (skip it because the "mov psw" saves the
50 mov -,psw] T bit, so continue gets a surprise trap)
51 [and #-,sp] fc/vc O2 main program prolog
52 [ld.- -(ap),-] pcc/gcc register arg loads
55 #define SKIP_PROLOGUE(pc) \
57 op = read_memory_integer (pc, 2); \
58 if ((op & 0xffc7) == 0x5ac0) pc += 2; \
59 else if (op == 0x1580) pc += 4; \
60 else if (op == 0x15c0) pc += 6; \
61 if ((read_memory_integer (pc, 2) & 0xfff8) == 0x7c40 \
62 && (read_memory_integer (pc + 2, 2) & 0xfff8) == 0x1240 \
63 && (read_memory_integer (pc + 8, 2) & 0xfff8) == 0x7c48) \
65 if (read_memory_integer (pc, 2) == 0x1240) pc += 6; \
67 op = read_memory_integer (pc, 2); \
70 if ((op & 0xfcc0) == 0x3000) pc += 4; \
71 else if ((op & 0xfcc0) == 0x3040) pc += 6; \
72 else if ((op & 0xfcc0) == 0x2800) pc += 4; \
73 else if ((op & 0xfcc0) == 0x2840) pc += 6; \
76 /* Immediately after a function call, return the saved pc.
77 (ignore frame and return *$sp so we can handle both calls and callq) */
79 #define SAVED_PC_AFTER_CALL(frame) \
80 read_memory_integer (read_register (SP_REGNUM), 4)
82 /* Address of end of stack space.
83 This is ((USRSTACK + 0xfff) & -0x1000)) from <convex/vmparam.h> but
84 that expression depends on the kernel version; instead, fetch a
85 page-zero pointer and get it from that. This will be invalid if
86 they ever change the way bkpt signals are delivered. */
88 #define STACK_END_ADDR (0xfffff000 & *(unsigned *) 0x80000050)
90 /* User-mode traps push an extended rtn block,
91 then fault with one of the following PCs */
93 #define is_trace_pc(pc) ((unsigned) ((pc) - (*(int *) 0x80000040)) <= 4)
94 #define is_arith_pc(pc) ((unsigned) ((pc) - (*(int *) 0x80000044)) <= 4)
95 #define is_break_pc(pc) ((unsigned) ((pc) - (*(int *) 0x80000050)) <= 4)
97 /* We need to manipulate trap bits in the psw */
99 #define PSW_TRAP_FLAGS 0x69670000
100 #define PSW_T_BIT 0x08000000
101 #define PSW_S_BIT 0x01000000
103 /* Stack grows downward. */
107 /* Sequence of bytes for breakpoint instruction. (bkpt) */
109 #define BREAKPOINT {0x7d,0x50}
111 /* Amount PC must be decremented by after a breakpoint.
112 This is often the number of bytes in BREAKPOINT but not always.
113 (The break PC needs to be decremented by 2, but we do it when the
114 break frame is recognized and popped. That way gdb can tell breaks
115 from trace traps with certainty.) */
117 #define DECR_PC_AFTER_BREAK 0
119 /* Nonzero if instruction at PC is a return instruction. (rtn or rtnq) */
121 #define ABOUT_TO_RETURN(pc) \
122 ((read_memory_integer (pc, 2) & 0xffe0) == 0x7c80)
124 /* Return 1 if P points to an invalid floating point value. */
126 #define INVALID_FLOAT(p,len) 0
128 /* Say how long (ordinary) registers are. */
130 #define REGISTER_TYPE long long
132 /* Number of machine registers */
136 /* Initializer for an array of names of registers.
137 There should be NUM_REGS strings in this initializer. */
139 #define REGISTER_NAMES {"pc","psw","fp","ap","a5","a4","a3","a2","a1","sp",\
140 "s7","s6","s5","s4","s3","s2","s1","s0",\
141 "S7","S6","S5","S4","S3","S2","S1","S0"}
143 /* Register numbers of various important registers.
144 Note that some of these values are "real" register numbers,
145 and correspond to the general registers of the machine,
146 and some are "phony" register numbers which are too large
147 to be actual register numbers as far as the user is concerned
148 but do serve to get the desired values when passed to read_register. */
150 #define S0_REGNUM 25 /* the real S regs */
152 #define s0_REGNUM 17 /* low-order halves of S regs */
154 #define SP_REGNUM 9 /* A regs */
158 #define FP_REGNUM 2 /* Contains address of executing stack frame */
159 #define PS_REGNUM 1 /* Contains processor status */
160 #define PC_REGNUM 0 /* Contains program counter */
162 /* convert dbx stab register number (from `r' declaration) to a gdb REGNUM */
164 #define STAB_REG_TO_REGNUM(value) \
165 ((value) < 8 ? S0_REGNUM - (value) : SP_REGNUM - ((value) - 8))
167 /* Vector register numbers, not handled as ordinary regs.
168 They are treated as convenience variables whose values are read
169 from the inferior when needed. */
177 /* Total amount of space needed to store our copies of the machine's
178 register state, the array `registers'. */
179 #define REGISTER_BYTES (4*10 + 8*8)
181 /* Index within `registers' of the first byte of the space for
183 NB: must match structure of struct syscall_context for correct operation */
185 #define REGISTER_BYTE(N) ((N) < s7_REGNUM ? 4*(N) : \
186 (N) < S7_REGNUM ? 44 + 8 * ((N)-s7_REGNUM) : \
187 40 + 8 * ((N)-S7_REGNUM))
189 /* Number of bytes of storage in the actual machine representation
192 #define REGISTER_RAW_SIZE(N) ((N) < S7_REGNUM ? 4 : 8)
194 /* Number of bytes of storage in the program's representation
197 #define REGISTER_VIRTUAL_SIZE(N) REGISTER_RAW_SIZE(N)
199 /* Largest value REGISTER_RAW_SIZE can have. */
201 #define MAX_REGISTER_RAW_SIZE 8
203 /* Largest value REGISTER_VIRTUAL_SIZE can have. */
205 #define MAX_REGISTER_VIRTUAL_SIZE 8
207 /* Nonzero if register N requires conversion
208 from raw format to virtual format. */
210 #define REGISTER_CONVERTIBLE(N) 0
212 /* Convert data from raw format for register REGNUM
213 to virtual format for register REGNUM. */
215 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
216 bcopy ((FROM), (TO), REGISTER_RAW_SIZE (REGNUM));
218 /* Convert data from virtual format for register REGNUM
219 to raw format for register REGNUM. */
221 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
222 bcopy ((FROM), (TO), REGISTER_RAW_SIZE (REGNUM));
224 /* Return the GDB type object for the "standard" data type
225 of data in register N. */
227 #define REGISTER_VIRTUAL_TYPE(N) \
228 ((N) < S7_REGNUM ? builtin_type_int : builtin_type_long_long)
230 /* Store the address of the place in which to copy the structure the
231 subroutine will return. This is called from call_function. */
233 #define STORE_STRUCT_RETURN(ADDR, SP) \
234 { write_register (A1_REGNUM, (ADDR)); }
236 /* Extract from an array REGBUF containing the (raw) register state
237 a function return value of type TYPE, and copy that, in virtual format,
240 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
241 bcopy (&((char *) REGBUF) [REGISTER_BYTE (S0_REGNUM) + \
242 8 - TYPE_LENGTH (TYPE)],\
243 VALBUF, TYPE_LENGTH (TYPE))
245 /* Write into appropriate registers a function return value
246 of type TYPE, given in virtual format. */
248 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
249 write_register_bytes (REGISTER_BYTE (S0_REGNUM), VALBUF, 8)
251 /* Extract from an array REGBUF containing the (raw) register state
252 the address in which a function should return its structure value,
253 as a CORE_ADDR (or an expression that can be used as one). */
255 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \
256 (*(int *) & ((char *) REGBUF) [REGISTER_BYTE (s0_REGNUM)])
258 /* Define trapped internal variable hooks to read and write
259 vector and communication registers. */
261 #define IS_TRAPPED_INTERNALVAR is_trapped_internalvar
262 #define VALUE_OF_TRAPPED_INTERNALVAR value_of_trapped_internalvar
263 #define SET_TRAPPED_INTERNALVAR set_trapped_internalvar
265 extern struct value *value_of_trapped_internalvar ();
267 /* Hooks to read data from soff exec and core files,
268 and to describe the files. */
270 #define XFER_CORE_FILE
271 #define FILES_INFO_HOOK print_maps
273 /* Hook to call to print a typeless integer value, normally printed in decimal.
274 For convex, use hex instead if the number looks like an address. */
276 #define PRINT_TYPELESS_INTEGER decout
278 /* For the native compiler, variables for a particular lexical context
279 are listed after the beginning LBRAC instead of before in the
280 executables list of symbols. Using "gcc_compiled." to distinguish
281 between GCC and native compiler doesn't work on Convex because the
282 linker sorts the symbols to put "gcc_compiled." in the wrong place.
283 desc is nonzero for native, zero for gcc. */
284 #define VARIABLES_INSIDE_BLOCK(desc, gcc_p) (desc != 0)
286 /* Pcc occaisionally puts an SO where there should be an SOL. */
287 #define PCC_SOL_BROKEN
289 /* Describe the pointer in each stack frame to the previous stack frame
292 /* FRAME_CHAIN takes a frame_info with a frame's nominal address in fi->frame,
293 and produces the frame's chain-pointer. */
295 /* (caller fp is saved at 8(fp)) */
297 #define FRAME_CHAIN(fi) (read_memory_integer ((fi)->frame + 8, 4))
299 /* Define other aspects of the stack frame. */
301 /* We need the boundaries of the text in the exec file, as a kludge,
302 for FRAMELESS_FUNCTION_INVOCATION and CALL_DUMMY_LOCATION. */
304 #define NEED_TEXT_START_END
306 /* A macro that tells us whether the function invocation represented
307 by FI does not have a frame on the stack associated with it. If it
308 does not, FRAMELESS is set to 1, else 0.
309 On convex, check at the return address for `callq' -- if so, frameless,
312 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
314 extern CORE_ADDR text_start, text_end; \
315 CORE_ADDR call_addr = SAVED_PC_AFTER_CALL (FI); \
316 (FRAMELESS) = (call_addr >= text_start && call_addr < text_end \
317 && read_memory_integer (call_addr - 6, 1) == 0x22); \
320 #define FRAME_SAVED_PC(fi) (read_memory_integer ((fi)->frame, 4))
322 #define FRAME_ARGS_ADDRESS(fi) (read_memory_integer ((fi)->frame + 12, 4))
324 #define FRAME_LOCALS_ADDRESS(fi) (fi)->frame
326 /* Return number of args passed to a frame.
327 Can return -1, meaning no way to tell. */
329 #define FRAME_NUM_ARGS(numargs, fi) \
330 { numargs = read_memory_integer (FRAME_ARGS_ADDRESS (fi) - 4, 4); \
331 if (numargs < 0 || numargs >= 256) numargs = -1;}
333 /* Return number of bytes at start of arglist that are not really args. */
335 #define FRAME_ARGS_SKIP 0
337 /* Put here the code to store, into a struct frame_saved_regs,
338 the addresses of the saved registers of frame described by FRAME_INFO.
339 This includes special registers such as pc and fp saved in special
340 ways in the stack frame. sp is even more special:
341 the address we return for it IS the sp for the next frame. */
343 /* Normal (short) frames save only PC, FP, (callee's) AP. To reasonably
344 handle gcc and pcc register variables, scan the code following the
345 call for the instructions the compiler inserts to reload register
346 variables from stack slots and record the stack slots as the saved
347 locations of those registers. This will occasionally identify some
348 random load as a saved register; this is harmless. vc does not
349 declare its register allocation actions in the stabs. */
351 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
352 { register int regnum; \
353 register int frame_length = /* 3 short, 2 long, 1 extended, 0 context */\
354 (read_memory_integer ((frame_info)->frame + 4, 4) >> 25) & 3; \
355 register CORE_ADDR frame_fp = \
356 read_memory_integer ((frame_info)->frame + 8, 4); \
357 register CORE_ADDR next_addr; \
358 bzero (&frame_saved_regs, sizeof frame_saved_regs); \
359 (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 0; \
360 (frame_saved_regs).regs[PS_REGNUM] = (frame_info)->frame + 4; \
361 (frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame + 8; \
362 (frame_saved_regs).regs[AP_REGNUM] = frame_fp + 12; \
363 next_addr = (frame_info)->frame + 12; \
364 if (frame_length < 3) \
365 for (regnum = A5_REGNUM; regnum < SP_REGNUM; ++regnum) \
366 (frame_saved_regs).regs[regnum] = (next_addr += 4); \
367 if (frame_length < 2) \
368 (frame_saved_regs).regs[SP_REGNUM] = (next_addr += 4); \
370 if (frame_length < 3) \
371 for (regnum = S7_REGNUM; regnum < S0_REGNUM; ++regnum) \
372 (frame_saved_regs).regs[regnum] = (next_addr += 8); \
373 if (frame_length < 2) \
374 (frame_saved_regs).regs[S0_REGNUM] = (next_addr += 8); \
376 (frame_saved_regs).regs[SP_REGNUM] = next_addr + 8; \
377 if (frame_length == 3) { \
378 CORE_ADDR pc = read_memory_integer ((frame_info)->frame, 4); \
380 op = read_memory_integer (pc, 2); \
381 if ((op & 0xffc7) == 0x1480) pc += 4; /* add.w #-,sp */ \
382 else if ((op & 0xffc7) == 0x58c0) pc += 2; /* add.w #-,sp */ \
383 op = read_memory_integer (pc, 2); \
384 if ((op & 0xffc7) == 0x2a06) pc += 4; /* ld.w -,ap */ \
386 op = read_memory_integer (pc, 2); \
387 ix = (op >> 3) & 7; \
388 if ((op & 0xfcc0) == 0x2800) { /* ld.- -,ak */ \
389 regnum = SP_REGNUM - (op & 7); \
390 disp = read_memory_integer (pc + 2, 2); \
392 else if ((op & 0xfcc0) == 0x2840) { /* ld.- -,ak */ \
393 regnum = SP_REGNUM - (op & 7); \
394 disp = read_memory_integer (pc + 2, 4); \
396 if ((op & 0xfcc0) == 0x3000) { /* ld.- -,sk */ \
397 regnum = S0_REGNUM - (op & 7); \
398 disp = read_memory_integer (pc + 2, 2); \
400 else if ((op & 0xfcc0) == 0x3040) { /* ld.- -,sk */ \
401 regnum = S0_REGNUM - (op & 7); \
402 disp = read_memory_integer (pc + 2, 4); \
404 else if ((op & 0xff00) == 0x7100) { /* br crossjump */ \
405 pc += 2 * (char) op; \
407 else if (op == 0x0140) { /* jmp crossjump */ \
408 pc = read_memory_integer (pc + 2, 4); \
411 if ((frame_saved_regs).regs[regnum]) \
413 if (ix == 7) disp += frame_fp; \
414 else if (ix == 6) disp += read_memory_integer (frame_fp + 12, 4); \
415 else if (ix != 0) break; \
416 (frame_saved_regs).regs[regnum] = \
417 disp - 8 + (1 << ((op >> 8) & 3)); \
418 if (regnum >= S7_REGNUM) \
419 (frame_saved_regs).regs[regnum - S0_REGNUM + s0_REGNUM] = \
420 disp - 4 + (1 << ((op >> 8) & 3)); \
425 /* Things needed for making the inferior call functions. */
427 #define CALL_DUMMY_LOCATION BEFORE_TEXT_END
429 /* Push an empty stack frame, to record the current PC, etc. */
431 #define PUSH_DUMMY_FRAME \
432 { register CORE_ADDR sp = read_register (SP_REGNUM); \
433 register int regnum; \
436 for (regnum = S0_REGNUM; regnum >= S7_REGNUM; --regnum) { \
437 read_register_bytes (REGISTER_BYTE (regnum), buf, 8); \
438 sp = push_bytes (sp, buf, 8);} \
439 for (regnum = SP_REGNUM; regnum >= FP_REGNUM; --regnum) { \
440 word = read_register (regnum); \
441 sp = push_bytes (sp, &word, 4);} \
442 word = (read_register (PS_REGNUM) &~ (3<<25)) | (1<<25); \
443 sp = push_bytes (sp, &word, 4); \
444 word = read_register (PC_REGNUM); \
445 sp = push_bytes (sp, &word, 4); \
446 write_register (SP_REGNUM, sp); \
447 write_register (FP_REGNUM, sp); \
448 write_register (AP_REGNUM, sp);}
450 /* Discard from the stack the innermost frame, restoring all registers. */
452 #define POP_FRAME do {\
453 register CORE_ADDR fp = read_register (FP_REGNUM); \
454 register int regnum; \
455 register int frame_length = /* 3 short, 2 long, 1 extended, 0 context */ \
456 (read_memory_integer (fp + 4, 4) >> 25) & 3; \
458 write_register (PC_REGNUM, read_memory_integer (fp, 4)); \
459 write_register (PS_REGNUM, read_memory_integer (fp += 4, 4)); \
460 write_register (FP_REGNUM, read_memory_integer (fp += 4, 4)); \
461 write_register (AP_REGNUM, read_memory_integer (fp += 4, 4)); \
462 if (frame_length < 3) \
463 for (regnum = A5_REGNUM; regnum < SP_REGNUM; ++regnum) \
464 write_register (regnum, read_memory_integer (fp += 4, 4)); \
465 if (frame_length < 2) \
466 write_register (SP_REGNUM, read_memory_integer (fp += 4, 4)); \
468 if (frame_length < 3) \
469 for (regnum = S7_REGNUM; regnum < S0_REGNUM; ++regnum) { \
470 read_memory (fp += 8, buf, 8); \
471 write_register_bytes (REGISTER_BYTE (regnum), buf, 8);} \
472 if (frame_length < 2) { \
473 read_memory (fp += 8, buf, 8); \
474 write_register_bytes (REGISTER_BYTE (regnum), buf, 8);} \
475 else write_register (SP_REGNUM, fp + 8); \
476 flush_cached_frames (); \
477 set_current_frame (create_new_frame (read_register (FP_REGNUM), \
481 /* This sequence of words is the instructions
486 Note this is 16 bytes. */
488 #define CALL_DUMMY {0x50860d4069696969LL,0x2140323232327d50LL}
490 #define CALL_DUMMY_LENGTH 16
492 #define CALL_DUMMY_START_OFFSET 0
494 /* Insert the specified number of args and function address
495 into a call sequence of the above form stored at DUMMYNAME. */
497 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
498 { *(int *)((char *) dummyname + 4) = nargs; \
499 *(int *)((char *) dummyname + 10) = fun; }
501 /* Defs to read soff symbol tables, see dbxread.c */
503 #define NUMBER_OF_SYMBOLS ((long) opthdr.o_nsyms)
504 #define STRING_TABLE_OFFSET ((long) filehdr.h_strptr)
505 #define SYMBOL_TABLE_OFFSET ((long) opthdr.o_symptr)
506 #define STRING_TABLE_SIZE ((long) filehdr.h_strsiz)
507 #define SIZE_OF_TEXT_SEGMENT ((long) txthdr.s_size)
508 #define ENTRY_POINT ((long) opthdr.o_entry)
510 #define READ_STRING_TABLE_SIZE(BUFFER) \
511 (BUFFER = STRING_TABLE_SIZE)
513 #define DECLARE_FILE_HEADERS \
518 #define READ_FILE_HEADERS(DESC,NAME) \
521 val = myread (DESC, &filehdr, sizeof filehdr); \
523 perror_with_name (NAME); \
524 if (! IS_SOFF_MAGIC (filehdr.h_magic)) \
525 error ("%s: not an executable file.", NAME); \
526 lseek (DESC, 0L, 0); \
527 if (myread (DESC, &filehdr, sizeof filehdr) < 0) \
528 perror_with_name (NAME); \
529 if (myread (DESC, &opthdr, filehdr.h_opthdr) <= 0) \
530 perror_with_name (NAME); \
531 for (n = 0; n < filehdr.h_nscns; n++) \
533 if (myread (DESC, &txthdr, sizeof txthdr) < 0) \
534 perror_with_name (NAME); \
535 if ((txthdr.s_flags & S_TYPMASK) == S_TEXT) \