gdb/m-sun2.h

   1 /* Parameters for execution on a Sun, 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
  21 #ifndef sun2
  22 #define sun2
  23 #endif
  24
  25 /* Define this if the C compiler puts an underscore at the front
  26    of external names before giving them to the linker.  */
  27
  28 #define NAMES_HAVE_UNDERSCORE
  29
  30 /* Debugger information will be in DBX format.  */
  31
  32 #define READ_DBX_FORMAT
  33
  34 /* Offset from address of function to start of its code.
  35    Zero on most machines.  */
  36
  37 #define FUNCTION_START_OFFSET 0
  38
  39 /* Advance PC across any function entry prologue instructions
  40    to reach some "real" code.  */
  41
  42 #define SKIP_PROLOGUE(pc)   \
  43 { register int op = read_memory_integer (pc, 2);        \
  44   if (op == 0047126)                            \
  45     pc += 4;   /* Skip link #word */                    \
  46   else if (op == 0044016)                       \
  47     pc += 6;   /* Skip link #long */                    \
  48 }
  49
  50 /* Immediately after a function call, return the saved pc.
  51    Can't go through the frames for this because on some machines
  52    the new frame is not set up until the new function executes
  53    some instructions.  */
  54
  55 #define SAVED_PC_AFTER_CALL(frame) \
  56 read_memory_integer (read_register (SP_REGNUM), 4)
  57
  58 /* This is the amount to subtract from u.u_ar0
  59    to get the offset in the core file of the register values.  */
  60
  61 #define KERNEL_U_ADDR 0x2800
  62
  63 /* Address of end of stack space.  */
  64
  65 #define STACK_END_ADDR 0x1000000
  66
  67 /* Stack grows downward.  */
  68
  69 #define INNER_THAN <
  70
  71 /* Sequence of bytes for breakpoint instruction.  */
  72
  73 #define BREAKPOINT {0x4e, 0x4f}
  74
  75 /* Amount PC must be decremented by after a breakpoint.
  76    This is often the number of bytes in BREAKPOINT
  77    but not always.  */
  78
  79 #define DECR_PC_AFTER_BREAK 2
  80
  81 /* Nonzero if instruction at PC is a return instruction.  */
  82
  83 #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 2) == 0x4e76)
  84
  85 /* Return 1 if P points to an invalid floating point value.  */
  86
  87 #define INVALID_FLOAT(p, len) 0   /* Just a first guess; not checked */
  88
  89 /* Say how long registers are.  */
  90
  91 #define REGISTER_TYPE long
  92
  93 /* Number of machine registers */
  94
  95 #define NUM_REGS 18
  96
  97 /* Number that are really general registers */
  98
  99 #define NUM_GENERAL_REGS 16
 100
 101 /* Initializer for an array of names of registers.
 102    There should be NUM_REGS strings in this initializer.  */
 103
 104 #define REGISTER_NAMES {"d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", "a0", "a1", "a2", "a3", "a4", "a5", "fp", "sp", "ps", "pc"}
 105
 106 /* Register numbers of various important registers.
 107    Note that some of these values are "real" register numbers,
 108    and correspond to the general registers of the machine,
 109    and some are "phony" register numbers which are too large
 110    to be actual register numbers as far as the user is concerned
 111    but do serve to get the desired values when passed to read_register.  */
 112
 113 #define FP_REGNUM 14            /* Contains address of executing stack frame */
 114 #define SP_REGNUM 15            /* Contains address of top of stack */
 115 #define PS_REGNUM 16            /* Contains processor status */
 116 #define PC_REGNUM 17            /* Contains program counter */
 117
 118 /* Total amount of space needed to store our copies of the machine's
 119    register state, the array `registers'.  */
 120 #define REGISTER_BYTES (16*4+8)
 121
 122 /* Index within `registers' of the first byte of the space for
 123    register N.  */
 124
 125 #define REGISTER_BYTE(N)  ((N) * 4)
 126
 127 /* Number of bytes of storage in the actual machine representation
 128    for register N.  On the 68000, all regs are 4 bytes.  */
 129
 130 #define REGISTER_RAW_SIZE(N) 4
 131
 132 /* Number of bytes of storage in the program's representation
 133    for register N.  On the 68000, all regs are 4 bytes.  */
 134
 135 #define REGISTER_VIRTUAL_SIZE(N) 4
 136
 137 /* Largest value REGISTER_RAW_SIZE can have.  */
 138
 139 #define MAX_REGISTER_RAW_SIZE 4
 140
 141 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 142
 143 #define MAX_REGISTER_VIRTUAL_SIZE 4
 144
 145 /* Nonzero if register N requires conversion
 146    from raw format to virtual format.  */
 147
 148 #define REGISTER_CONVERTIBLE(N) 0
 149
 150 /* Convert data from raw format for register REGNUM
 151    to virtual format for register REGNUM.  */
 152
 153 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO)  bcopy ((FROM), (TO), 4);
 154
 155 /* Convert data from virtual format for register REGNUM
 156    to raw format for register REGNUM.  */
 157
 158 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO)  bcopy ((FROM), (TO), 4);
 159
 160 /* Return the GDB type object for the "standard" data type
 161    of data in register N.  */
 162
 163 #define REGISTER_VIRTUAL_TYPE(N)  builtin_type_int
 164
 165 /* Extract from an array REGBUF containing the (raw) register state
 166    a function return value of type TYPE, and copy that, in virtual format,
 167    into VALBUF.  */
 168
 169 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 170   bcopy (REGBUF, VALBUF, TYPE_LENGTH (TYPE))
 171
 172 /* Write into appropriate registers a function return value
 173    of type TYPE, given in virtual format.  */
 174
 175 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 176   write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE))
 177
 178 /* Extract from an array REGBUF containing the (raw) register state
 179    the address in which a function should return its structure value,
 180    as a CORE_ADDR (or an expression that can be used as one).  */
 181
 182 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF))
 183
 184 /* This is a piece of magic that is given a register number REGNO
 185    and as BLOCKEND the address in the system of the end of the user structure
 186    and stores in ADDR the address in the kernel or core dump
 187    of that register.  */
 188
 189 #define REGISTER_U_ADDR(addr, blockend, regno)          \
 190 { addr = blockend + regno * 4; }
 191 \f
 192 /* Describe the pointer in each stack frame to the previous stack frame
 193    (its caller).  */
 194
 195 /* FRAME_CHAIN takes a frame's nominal address
 196    and produces the frame's chain-pointer.
 197
 198    FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address
 199    and produces the nominal address of the caller frame.
 200
 201    However, if FRAME_CHAIN_VALID returns zero,
 202    it means the given frame is the outermost one and has no caller.
 203    In that case, FRAME_CHAIN_COMBINE is not used.  */
 204
 205 /* In the case of the Sun, the frame's nominal address
 206    is the address of a 4-byte word containing the calling frame's address.  */
 207
 208 #define FRAME_CHAIN(thisframe)  (read_memory_integer (thisframe, 4))
 209
 210 #define FRAME_CHAIN_VALID(chain, thisframe) \
 211   (chain != 0 && (FRAME_SAVED_PC (thisframe) >= first_object_file_end))
 212
 213 #define FRAME_CHAIN_COMBINE(chain, thisframe) (chain)
 214
 215 /* Define other aspects of the stack frame.  */
 216
 217 #define FRAME_SAVED_PC(frame) (read_memory_integer (frame + 4, 4))
 218
 219 #define FRAME_ARGS_ADDRESS(fi) (fi.frame)
 220
 221 #define FRAME_LOCALS_ADDRESS(fi) (fi.frame)
 222
 223 /* Set VAL to the number of args passed to frame described by FI.
 224    Can set VAL to -1, meaning no way to tell.  */
 225
 226 /* We can't tell how many args there are
 227    now that the C compiler delays popping them.  */
 228 #define FRAME_NUM_ARGS(val,fi) (val = -1)
 229
 230 #if 0
 231 #define FRAME_NUM_ARGS(val, fi)  \
 232 { register CORE_ADDR pc = FRAME_SAVED_PC (fi.frame);            \
 233   register int insn = 0177777 & read_memory_integer (pc, 2);    \
 234   val = 0;                                                      \
 235   if (insn == 0047757 || insn == 0157374)  /* lea W(sp),sp or addaw #W,sp */ \
 236     val = read_memory_integer (pc + 2, 2);                      \
 237   else if ((insn & 0170777) == 0050217 /* addql #N, sp */       \
 238            || (insn & 0170777) == 0050117)  /* addqw */         \
 239     { val = (insn >> 9) & 7; if (val == 0) val = 8; }           \
 240   else if (insn == 0157774) /* addal #WW, sp */                 \
 241     val = read_memory_integer (pc + 2, 4);                      \
 242   val >>= 2; }
 243 #endif
 244
 245 /* Return number of bytes at start of arglist that are not really args.  */
 246
 247 #define FRAME_ARGS_SKIP 8
 248
 249 /* Put here the code to store, into a struct frame_saved_regs,
 250    the addresses of the saved registers of frame described by FRAME_INFO.
 251    This includes special registers such as pc and fp saved in special
 252    ways in the stack frame.  sp is even more special:
 253    the address we return for it IS the sp for the next frame.  */
 254
 255 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs)             \
 256 { register int regnum;                                                  \
 257   register int regmask;                                                 \
 258   register CORE_ADDR next_addr;                                         \
 259   register CORE_ADDR pc;                                                \
 260   bzero (&frame_saved_regs, sizeof frame_saved_regs);                   \
 261   if ((frame_info).pc >= (frame_info).frame - CALL_DUMMY_LENGTH - FP_REGNUM*4 - 4 \
 262       && (frame_info).pc <= (frame_info).frame)                         \
 263     { next_addr = (frame_info).frame;                                   \
 264       pc = (frame_info).frame - CALL_DUMMY_LENGTH - FP_REGNUM * 4 - 4; }\
 265   else                                                                  \
 266     { pc = get_pc_function_start ((frame_info).pc);                     \
 267       /* Verify we have a link a6 instruction next;                     \
 268          if not we lose.  If we win, find the address above the saved   \
 269          regs using the amount of storage from the link instruction.  */\
 270       if (044016 == read_memory_integer (pc, 2))                        \
 271         next_addr = (frame_info).frame + read_memory_integer (pc += 2, 4), pc+=4; \
 272       else if (047126 == read_memory_integer (pc, 2))                   \
 273         next_addr = (frame_info).frame + read_memory_integer (pc += 2, 2), pc+=2; \
 274       else goto lose;                                                   \
 275       /* If have an addal #-n, sp next, adjust next_addr.  */           \
 276       if ((0177777 & read_memory_integer (pc, 2)) == 0157774)           \
 277         next_addr += read_memory_integer (pc += 2, 4), pc += 4;         \
 278     }                                                                   \
 279   /* next should be a moveml to (sp) or -(sp) or a movl r,-(sp) */      \
 280   regmask = read_memory_integer (pc + 2, 2);                            \
 281   if (0044327 == read_memory_integer (pc, 2))                           \
 282     { pc += 4; /* Regmask's low bit is for register 0, the first written */ \
 283       for (regnum = 0; regnum < 16; regnum++, regmask >>= 1)            \
 284         if (regmask & 1)                                                \
 285           (frame_saved_regs).regs[regnum] = (next_addr += 4) - 4; }     \
 286   else if (0044347 == read_memory_integer (pc, 2))                      \
 287     { pc += 4; /* Regmask's low bit is for register 15, the first pushed */ \
 288       for (regnum = 15; regnum >= 0; regnum--, regmask >>= 1)           \
 289         if (regmask & 1)                                                \
 290           (frame_saved_regs).regs[regnum] = (next_addr -= 4); }         \
 291   else if (0x2f00 == 0xfff0 & read_memory_integer (pc, 2))              \
 292     { regnum = 0xf & read_memory_integer (pc, 2); pc += 2;              \
 293       (frame_saved_regs).regs[regnum] = (next_addr -= 4); }             \
 294   /* clrw -(sp); movw ccr,-(sp) may follow.  */                         \
 295   if (0x426742e7 == read_memory_integer (pc, 4))                        \
 296     (frame_saved_regs).regs[PS_REGNUM] = (next_addr -= 4);              \
 297   lose: ;                                                               \
 298   (frame_saved_regs).regs[SP_REGNUM] = (frame_info).frame + 8;          \
 299   (frame_saved_regs).regs[FP_REGNUM] = (frame_info).frame;              \
 300   (frame_saved_regs).regs[PC_REGNUM] = (frame_info).frame + 4;          \
 301 }
 302 \f
 303 /* Things needed for making the inferior call functions.  */
 304
 305 /* Push an empty stack frame, to record the current PC, etc.  */
 306
 307 #define PUSH_DUMMY_FRAME \
 308 { register CORE_ADDR sp = read_register (SP_REGNUM);\
 309   register int regnum;                              \
 310   sp = push_word (sp, read_register (PC_REGNUM));   \
 311   sp = push_word (sp, read_register (FP_REGNUM));   \
 312   write_register (FP_REGNUM, sp);                   \
 313   for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--)  \
 314     sp = push_word (sp, read_register (regnum));    \
 315   sp = push_word (sp, read_register (PS_REGNUM));   \
 316   write_register (SP_REGNUM, sp);  }
 317
 318 /* Discard from the stack the innermost frame, restoring all registers.  */
 319
 320 #define POP_FRAME  \
 321 { register CORE_ADDR fp = read_register (FP_REGNUM);             \
 322   register int regnum;                                           \
 323   struct frame_saved_regs fsr;                                   \
 324   struct frame_info fi;                                          \
 325   fi = get_frame_info (fp);                                      \
 326   get_frame_saved_regs (&fi, &fsr);                              \
 327   for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--)            \
 328     if (fsr.regs[regnum])                                        \
 329       write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \
 330   if (fsr.regs[PS_REGNUM])                                       \
 331     write_register (PS_REGNUM, read_memory_integer (fsr.regs[PS_REGNUM], 4)); \
 332   write_register (FP_REGNUM, read_memory_integer (fp, 4));       \
 333   write_register (PC_REGNUM, read_memory_integer (fp + 4, 4));   \
 334   write_register (SP_REGNUM, fp + 8);                            \
 335 }
 336
 337 /* This sequence of words is the instructions
 338      moveml 0xfffc,-(sp)
 339      clrw -(sp)
 340      movew ccr,-(sp)
 341      /..* The arguments are pushed at this point by GDB;
 342         no code is needed in the dummy for this.
 343         The CALL_DUMMY_START_OFFSET gives the position of
 344         the following jsr instruction.  *../
 345      jsr @#32323232
 346      addl #69696969,sp
 347      bpt
 348      nop
 349 Note this is 24 bytes.
 350 We actually start executing at the jsr, since the pushing of the
 351 registers is done by PUSH_DUMMY_FRAME.  If this were real code,
 352 the arguments for the function called by the jsr would be pushed
 353 between the moveml and the jsr, and we could allow it to execute through.
 354 But the arguments have to be pushed by GDB after the PUSH_DUMMY_FRAME is done,
 355 and we cannot allow the moveml to push the registers again lest they be
 356 taken for the arguments.  */
 357
 358 #define CALL_DUMMY {0x48e7fffc, 0x426742e7, 0x4eb93232, 0x3232dffc, 0x69696969, 0x4e4f4e71}
 359
 360 #define CALL_DUMMY_LENGTH 24
 361
 362 #define CALL_DUMMY_START_OFFSET 8
 363
 364 /* Insert the specified number of args and function address
 365    into a call sequence of the above form stored at DUMMYNAME.  */
 366
 367 #define FIX_CALL_DUMMY(dummyname, fun, nargs)     \
 368 { *(int *)((char *) dummyname + 16) = nargs * 4;  \
 369   *(int *)((char *) dummyname + 10) = fun; }
 370 \f
 371 /* Interface definitions for kernel debugger KDB.  */
 372
 373 /* Map machine fault codes into signal numbers.
 374    First subtract 0, divide by 4, then index in a table.
 375    Faults for which the entry in this table is 0
 376    are not handled by KDB; the program's own trap handler
 377    gets to handle then.  */
 378
 379 #define FAULT_CODE_ORIGIN 0
 380 #define FAULT_CODE_UNITS 4
 381 #define FAULT_TABLE    \
 382 { 0, 0, 0, 0, SIGTRAP, 0, 0, 0, \
 383   0, SIGTRAP, 0, 0, 0, 0, 0, SIGKILL, \
 384   0, 0, 0, 0, 0, 0, 0, 0, \
 385   SIGILL }
 386
 387 /* Start running with a stack stretching from BEG to END.
 388    BEG and END should be symbols meaningful to the assembler.
 389    This is used only for kdb.  */
 390
 391 #define INIT_STACK(beg, end)  \
 392 { asm (".globl end");         \
 393   asm ("movel $ end, sp");      \
 394   asm ("clrl fp"); }
 395
 396 /* Push the frame pointer register on the stack.  */
 397 #define PUSH_FRAME_PTR        \
 398   asm ("movel fp, -(sp)");
 399
 400 /* Copy the top-of-stack to the frame pointer register.  */
 401 #define POP_FRAME_PTR  \
 402   asm ("movl (sp), fp");
 403
 404 /* After KDB is entered by a fault, push all registers
 405    that GDB thinks about (all NUM_REGS of them),
 406    so that they appear in order of ascending GDB register number.
 407    The fault code will be on the stack beyond the last register.  */
 408
 409 #define PUSH_REGISTERS        \
 410 { asm ("clrw -(sp)");         \
 411   asm ("pea 10(sp)");         \
 412   asm ("movem $ 0xfffe,-(sp)"); }
 413
 414 /* Assuming the registers (including processor status) have been
 415    pushed on the stack in order of ascending GDB register number,
 416    restore them and return to the address in the saved PC register.  */
 417
 418 #define POP_REGISTERS          \
 419 { asm ("subil $8,28(sp)");     \
 420   asm ("movem (sp),$ 0xffff"); \
 421   asm ("rte"); }