gdb/tm-hppahpux.h

   1 /* Parameters for execution on a Hewlett-Packard PA-RISC machine, running
   2    HPUX or BSD.
   3    Copyright (C) 1986, 1987, 1989, 1990, 1991 Free Software Foundation, Inc.
   4
   5    Contributed by the Center for Software Science at the
   6    University of Utah (pa-gdb-bugs@cs.utah.edu).
   7
   8 This file is part of GDB.
   9
  10 GDB is free software; you can redistribute it and/or modify
  11 it under the terms of the GNU General Public License as published by
  12 the Free Software Foundation; either version 1, or (at your option)
  13 any later version.
  14
  15 GDB is distributed in the hope that it will be useful,
  16 but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 GNU General Public License for more details.
  19
  20 You should have received a copy of the GNU General Public License
  21 along with GDB; see the file COPYING.  If not, write to
  22 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  23
  24
  25 /* Get at various relevent fields of an instruction word. */
  26
  27 #define MASK_5 0x1f
  28 #define MASK_11 0x7ff
  29 #define MASK_14 0x3fff
  30 #define MASK_21 0x1fffff
  31
  32 /* This macro gets bit fields using HP's numbering (MSB = 0) */
  33
  34 #define GET_FIELD(X, FROM, TO) \
  35   ((X) >> 31 - (TO) & (1 << ((TO) - (FROM) + 1)) - 1)
  36
  37 /* Watch out for NaNs */
  38
  39 #define IEEE_FLOAT
  40
  41 /* Groan */
  42
  43 #define ARGS_GROW_DOWN
  44
  45 /* Get rid of any system-imposed stack limit if possible.  */
  46
  47
  48
  49 /* Define this if the C compiler puts an underscore at the front
  50    of external names before giving them to the linker.  */
  51
  52 /* #define NAMES_HAVE_UNDERSCORE */
  53
  54 /* Debugger information will be in DBX format.  */
  55
  56 #define READ_DBX_FORMAT
  57
  58 /* Offset from address of function to start of its code.
  59    Zero on most machines.  */
  60
  61 #define FUNCTION_START_OFFSET 0
  62
  63 /* Advance PC across any function entry prologue instructions
  64    to reach some "real" code.  */
  65
  66 /* skip (stw rp, -20(0,sp)); copy 4,1; copy sp, 4; stwm 1,framesize(sp)
  67    for gcc, or (stw rp, -20(0,sp); stwm 1, framesize(sp) for hcc */
  68
  69 #define SKIP_PROLOGUE(pc) \
  70 { if (read_memory_integer ((pc), 4) == 0x6BC23FD9)                      \
  71     { if (read_memory_integer ((pc) + 4, 4) == 0x8040241)               \
  72         (pc) += 16;                                                     \
  73       else if ((read_memory_integer (pc + 4, 4) & ~MASK_14) == 0x68810000) \
  74         (pc) += 8;}                                                     \
  75   else if (read_memory_integer ((pc), 4) == 0x8040241)                  \
  76     (pc) += 12;                                                         \
  77   else if ((read_memory_integer (pc, 4) & ~MASK_14) == 0x68810000)      \
  78     (pc) += 4;}
  79
  80 /* Immediately after a function call, return the saved pc.
  81    Can't go through the frames for this because on some machines
  82    the new frame is not set up until the new function executes
  83    some instructions.  */
  84
  85
  86 #define SAVED_PC_AFTER_CALL(frame)              \
  87   ((get_frame_pc (frame) >= millicode_start     \
  88     && get_frame_pc (frame) < millicode_end) ?  \
  89    read_register (31) & ~3                      \
  90    : read_register (RP_REGNUM) & ~3)
  91
  92 /* Address of end of stack space. Who knows.  */
  93
  94 #define STACK_END_ADDR 0x80000000
  95
  96 /* Stack grows upward */
  97
  98 #define INNER_THAN >
  99
 100
 101 /* Sequence of bytes for breakpoint instruction.  */
 102
 103 /*#define BREAKPOINT {0x00, 0x00, 0x00, 0x00}*/
 104 #ifdef  KERNELDEBUG     /* XXX */
 105 #define BREAKPOINT {0x00, 0x00, 0xa0, 0x00}
 106 #else
 107 #define BREAKPOINT {0x00, 0x01, 0x00, 0x04}
 108 #endif
 109
 110 /* Amount PC must be decremented by after a breakpoint.
 111    This is often the number of bytes in BREAKPOINT
 112    but not always.
 113
 114    Not on the PA-RISC */
 115
 116 #define DECR_PC_AFTER_BREAK 0
 117
 118 /* return instruction is bv r0(rp) */
 119
 120 #define ABOUT_TO_RETURN(pc) (read_memory_integer (pc, 4) == 0xE840C000)
 121
 122 /* Return 1 if P points to an invalid floating point value.  */
 123
 124 #define INVALID_FLOAT(p, len) 0   /* Just a first guess; not checked */
 125
 126 /* Largest integer type */
 127 #define LONGEST long
 128
 129 /* Name of the builtin type for the LONGEST type above. */
 130 #define BUILTIN_TYPE_LONGEST builtin_type_long
 131
 132 /* Say how long (ordinary) registers are.  */
 133
 134 #define REGISTER_TYPE long
 135
 136 /* Number of machine registers */
 137
 138 #define NUM_REGS 100
 139
 140 /* Initializer for an array of names of registers.
 141    There should be NUM_REGS strings in this initializer.  */
 142
 143 #define REGISTER_NAMES  \
 144  {"flags", "r1", "rp", "r3", "r4", "r5", "r6", "r7", "r8", "r9",        \
 145   "r10", "r11", "r12", "r13", "r14", "r15", "r16", "r17", "r18", "r19", \
 146   "r20", "r21", "r22", "arg3", "arg2", "arg1", "arg0", "dp", "ret0", "ret1", \
 147   "sp", "r31", "sar", "pcoqh", "pcsqh", "pcoqt", "pcsqt", \
 148   "eiem", "iir", "isr", "ior", "ipsw", "goto", "sr4", "sr0", "sr1", "sr2", \
 149   "sr3", "sr5", "sr6", "sr7", "cr0", "cr8", "cr9", "ccr", "cr12", "cr13", \
 150   "cr24", "cr25", "cr26", "mpsfu_high", "mpsfu_low", "mpsfu_ovflo", "pad", \
 151   "fpsr", "fpe1", "fpe2", "fpe3", "fpe4", "fpe5", "fpe6", "fpe7", \
 152   "fp4", "fp5", "fp6", "fp7", "fp8", \
 153   "fp9", "fp10", "fp11", "fp12", "fp13", "fp14", "fp15", \
 154   "fp16", "fp17", "fp18", "fp19", "fp20", "fp21", "fp22", "fp23", \
 155   "fp24", "fp25", "fp26", "fp27", "fp28", "fp29", "fp30", "fp31"}
 156
 157
 158
 159 /* Register numbers of various important registers.
 160    Note that some of these values are "real" register numbers,
 161    and correspond to the general registers of the machine,
 162    and some are "phony" register numbers which are too large
 163    to be actual register numbers as far as the user is concerned
 164    but do serve to get the desired values when passed to read_register.  */
 165
 166 #define RP_REGNUM 2             /* return pointer */
 167 #define FP_REGNUM 4             /* Contains address of executing stack */
 168                                 /* frame */
 169 #define SP_REGNUM 30            /* Contains address of top of stack */
 170 #define SAR_REGNUM 32           /* shift amount register */
 171 #define IPSW_REGNUM 41          /* processor status word. ? */
 172 #define PCOQ_HEAD_REGNUM 33     /* instruction offset queue head */
 173 #define PCSQ_HEAD_REGNUM 34     /* instruction space queue head */
 174 #define PCOQ_TAIL_REGNUM 35     /* instruction offset queue tail */
 175 #define PCSQ_TAIL_REGNUM 36     /* instruction space queue tail */
 176 #define FP0_REGNUM 64           /* floating point reg. 0 */
 177 #define FP4_REGNUM 72
 178
 179 /* compatibility with the rest of gdb. */
 180 #define PC_REGNUM PCOQ_HEAD_REGNUM
 181 #define NPC_REGNUM PCOQ_TAIL_REGNUM
 182
 183 /* Define DO_REGISTERS_INFO() to do machine-specific formatting
 184    of register dumps. */
 185
 186 #define DO_REGISTERS_INFO(_regnum, fp) pa_do_registers_info (_regnum, fp)
 187
 188 /* PA specific macro to see if the current instruction is nullified. */
 189 #define INSTRUCTION_NULLIFIED ((int)read_register (IPSW_REGNUM) & 0x00200000)
 190
 191 /* Total amount of space needed to store our copies of the machine's
 192    register state, the array `registers'.  */
 193 #define REGISTER_BYTES (32 * 4 + 11 * 4 + 8 * 4 + 12 * 4 + 4 + 32 * 8)
 194
 195 /* Index within `registers' of the first byte of the space for
 196    register N.  */
 197
 198 #define REGISTER_BYTE(N) \
 199  ((N) >= FP4_REGNUM ? ((N) - FP4_REGNUM) * 8 + 288 : (N) * 4)
 200
 201 /* Number of bytes of storage in the actual machine representation
 202    for register N.  On the PA-RISC, all regs are 4 bytes
 203    except the floating point regs which are 8 bytes.  */
 204
 205 #define REGISTER_RAW_SIZE(N) ((N) < FP4_REGNUM ? 4 : 8)
 206
 207 /* Number of bytes of storage in the program's representation
 208    for register N. */
 209
 210 #define REGISTER_VIRTUAL_SIZE(N) REGISTER_RAW_SIZE(N)
 211
 212 /* Largest value REGISTER_RAW_SIZE can have.  */
 213
 214 #define MAX_REGISTER_RAW_SIZE 8
 215
 216 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 217
 218 #define MAX_REGISTER_VIRTUAL_SIZE 8
 219
 220 /* Nonzero if register N requires conversion
 221    from raw format to virtual format.  */
 222
 223 #define REGISTER_CONVERTIBLE(N) 0
 224
 225 /* Convert data from raw format for register REGNUM
 226    to virtual format for register REGNUM.  */
 227
 228 #define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,FROM,TO) \
 229 { bcopy ((FROM), (TO), (REGNUM) < FP4_REGNUM ? 4 : 8); }
 230
 231 /* Convert data from virtual format for register REGNUM
 232    to raw format for register REGNUM.  */
 233
 234 #define REGISTER_CONVERT_TO_RAW(REGNUM,FROM,TO) \
 235 { bcopy ((FROM), (TO), (REGNUM) < FP4_REGNUM ? 4 : 8); }
 236
 237 /* Return the GDB type object for the "standard" data type
 238    of data in register N.  */
 239
 240 #define REGISTER_VIRTUAL_TYPE(N) \
 241  ((N) < FP4_REGNUM ? builtin_type_int : builtin_type_double)
 242
 243 /* Store the address of the place in which to copy the structure the
 244    subroutine will return.  This is called from call_function. */
 245
 246 #define STORE_STRUCT_RETURN(ADDR, SP) {write_register (28, (ADDR)); }
 247
 248 /* Extract from an array REGBUF containing the (raw) register state
 249    a function return value of type TYPE, and copy that, in virtual format,
 250    into VALBUF.  */
 251
 252 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 253   bcopy ((REGBUF) + REGISTER_BYTE(TYPE_LENGTH(TYPE) > 4 ? \
 254         FP4_REGNUM :28), VALBUF, TYPE_LENGTH (TYPE))
 255
 256 /* Write into appropriate registers a function return value
 257    of type TYPE, given in virtual format.  */
 258
 259 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 260   write_register_bytes (TYPE_LENGTH(TYPE) > 4 ? FP4_REGNUM :28,         \
 261                         VALBUF, TYPE_LENGTH (TYPE))
 262
 263 /* Extract from an array REGBUF containing the (raw) register state
 264    the address in which a function should return its structure value,
 265    as a CORE_ADDR (or an expression that can be used as one).  */
 266
 267 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)((REGBUF) + 28))
 268
 269 /* This is a piece of magic that is given a register number REGNO
 270    and as BLOCKEND the address in the system of the end of the user structure
 271    and stores in ADDR the address in the kernel or core dump
 272    of that register.  */
 273
 274
 275 /* Describe the pointer in each stack frame to the previous stack frame
 276    (its caller).  */
 277
 278 /* FRAME_CHAIN takes a frame's nominal address
 279    and produces the frame's chain-pointer.
 280
 281    FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address
 282    and produces the nominal address of the caller frame.
 283
 284    However, if FRAME_CHAIN_VALID returns zero,
 285    it means the given frame is the outermost one and has no caller.
 286    In that case, FRAME_CHAIN_COMBINE is not used.  */
 287
 288 /* In the case of the PA-RISC, the frame's nominal address
 289    is the address of a 4-byte word containing the calling frame's
 290    address (previous FP).  */
 291
 292 #define FRAME_CHAIN(thisframe)  \
 293   (inside_entry_file ((thisframe)->pc) ? \
 294    read_memory_integer ((thisframe)->frame, 4) :\
 295    0)
 296
 297 #define FRAME_CHAIN_VALID(chain, thisframe) \
 298   frame_chain_valid (chain, thisframe)
 299
 300 #define FRAME_CHAIN_COMBINE(chain, thisframe) (chain)
 301
 302 /* Define other aspects of the stack frame.  */
 303
 304 /* A macro that tells us whether the function invocation represented
 305    by FI does not have a frame on the stack associated with it.  If it
 306    does not, FRAMELESS is set to 1, else 0.  */
 307 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
 308   (FRAMELESS) = frameless_look_for_prologue(FI)
 309
 310 #define FRAME_SAVED_PC(FRAME) frame_saved_pc (FRAME)
 311
 312 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
 313
 314 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 315 /* Set VAL to the number of args passed to frame described by FI.
 316    Can set VAL to -1, meaning no way to tell.  */
 317
 318 /* We can't tell how many args there are
 319    now that the C compiler delays popping them.  */
 320 #define FRAME_NUM_ARGS(val,fi) (val = -1)
 321
 322 /* Return number of bytes at start of arglist that are not really args.  */
 323
 324 #define FRAME_ARGS_SKIP 0
 325
 326 /* Put here the code to store, into a struct frame_saved_regs,
 327    the addresses of the saved registers of frame described by FRAME_INFO.
 328    This includes special registers such as pc and fp saved in special
 329    ways in the stack frame.  sp is even more special:
 330    the address we return for it IS the sp for the next frame.  */
 331
 332 /* Deal with dummy functions later. */
 333
 334 #define STW_P(INSN) (((INSN) & 0xfc000000) == 0x68000000)
 335 #define ADDIL_P(INSN) (((INSN) & 0xfc000000) == 0x28000000)
 336 #define LDO_P(INSN) (((INSN) & 0xfc00c000) == 0x34000000)
 337
 338 int millicode_start, millicode_end;
 339
 340 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs)             \
 341 { register int regnum;                                                  \
 342   register CORE_ADDR next_addr;                                         \
 343   register CORE_ADDR pc;                                                \
 344   unsigned this_insn;                                                   \
 345   unsigned address;                                                     \
 346                                                                         \
 347   bzero (&frame_saved_regs, sizeof frame_saved_regs);                   \
 348   if ((frame_info)->pc <= ((frame_info)->frame - CALL_DUMMY_LENGTH -    \
 349                            FP_REGNUM * 4 - 16 * 8)                      \
 350       && (frame_info)->pc > (frame_info)->frame)                        \
 351     find_dummy_frame_regs ((frame_info), &(frame_saved_regs));          \
 352   else                                                                  \
 353     { pc = get_pc_function_start ((frame_info)->pc);                    \
 354       if (read_memory_integer (pc, 4) == 0x6BC23FD9)                    \
 355         { (frame_saved_regs).regs[RP_REGNUM] = (frame_info)->frame - 20;\
 356           pc = pc + 4;                                                  \
 357         }                                                               \
 358       if (read_memory_integer (pc, 4) != 0x8040241) goto lose;          \
 359       pc += 8;                  /* skip "copy 4,1; copy 30, 4" */       \
 360       /* skip either "stw 1,0(4);addil L'fsize,30;ldo R'fsize(1),30"    \
 361          or "stwm 1,fsize(30)" */                                       \
 362       if ((read_memory_integer (pc, 4) & ~MASK_14) == 0x68810000)       \
 363         pc += 12;                                                       \
 364       else                                                              \
 365         pc += 4;                                                        \
 366       while (1)                                                         \
 367         { this_insn = read_memory_integer(pc, 4);                       \
 368           if (STW_P (this_insn)) /* stw */                              \
 369             { regnum = GET_FIELD (this_insn, 11, 15);                   \
 370               if (!regnum) goto lose;                                   \
 371               (frame_saved_regs).regs[regnum] = (frame_info)->frame +   \
 372                 extract_14 (this_insn);                                 \
 373               pc += 4;                                                  \
 374             }                                                           \
 375           else if (ADDIL_P (this_insn)) /* addil */                     \
 376             { int next_insn;                                            \
 377               next_insn = read_memory_integer(pc + 4, 4);               \
 378               if (STW_P (next_insn)) /* stw */                          \
 379                 { regnum = GET_FIELD (this_insn, 6, 10);                \
 380                   if (!regnum) goto lose;                               \
 381                   (frame_saved_regs).regs[regnum] = (frame_info)->frame +\
 382                     (extract_21 (this_insn) << 11) + extract_14 (next_insn);\
 383                   pc += 8;                                              \
 384                 }                                                       \
 385               else                                                      \
 386                 break;                                                  \
 387             }                                                           \
 388           else                                                          \
 389             { pc += 4;                                                  \
 390               break;                                                    \
 391             }                                                           \
 392         }                                                               \
 393       this_insn = read_memory_integer (pc, 4);                          \
 394       if (LDO_P (this_insn))                                            \
 395         { next_addr = (frame_info)->frame + extract_14 (this_insn);     \
 396           pc += 4;                                                      \
 397         }                                                               \
 398       else if (ADDIL_P (this_insn))                                     \
 399         { next_addr = (frame_info)->frame + (extract_21 (this_insn) << 11)\
 400             + extract_14 (read_memory_integer (pc + 4, 4));             \
 401             pc += 8;                                                    \
 402           }                                                             \
 403       while (1)                                                         \
 404         { this_insn = read_memory_integer (pc, 4);                      \
 405           if ((this_insn & 0xfc001fe0) == 0x2c001220) /* fstds,ma */    \
 406             { regnum = GET_FIELD (this_insn, 27, 31);                   \
 407               (frame_saved_regs).regs[regnum + FP0_REGNUM] = next_addr; \
 408               next_addr += 8;                                           \
 409             }                                                           \
 410           else                                                          \
 411             break;                                                      \
 412         }                                                               \
 413     lose:                                                               \
 414       (frame_saved_regs).regs[FP_REGNUM] = (frame_info)->frame;         \
 415       (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame -4;      \
 416     }}
 417 \f
 418 /* Things needed for making the inferior call functions.  */
 419
 420 /* Push an empty stack frame, to record the current PC, etc. */
 421
 422 #define PUSH_DUMMY_FRAME \
 423 { register CORE_ADDR sp = read_register (SP_REGNUM);                    \
 424   register int regnum;                                                  \
 425   int int_buffer;                                                       \
 426   double freg_buffer;                                                   \
 427   /* Space for "arguments"; the RP goes in here. */                     \
 428   sp += 48;                                                             \
 429   int_buffer = read_register (RP_REGNUM) | 0x3;                         \
 430   write_memory (sp - 20, &int_buffer, 4);                               \
 431   int_buffer = read_register (FP_REGNUM);                               \
 432   write_memory (sp, &int_buffer, 4);                                    \
 433   write_register (FP_REGNUM, sp);                                       \
 434   sp += 4;                                                              \
 435   for (regnum = 1; regnum < 31; regnum++)                               \
 436     if (regnum != RP_REGNUM && regnum != FP_REGNUM)                     \
 437       sp = push_word (sp, read_register (regnum));                      \
 438   for (regnum = FP0_REGNUM; regnum < NUM_REGS; regnum++)                \
 439     { read_register_bytes (REGISTER_BYTE (regnum), &freg_buffer, 8);    \
 440       sp = push_bytes (sp, &freg_buffer, 8);}                           \
 441   sp = push_word (sp, read_register (IPSW_REGNUM));                     \
 442   sp = push_word (sp, read_register (SAR_REGNUM));                      \
 443   sp = push_word (sp, read_register (PCOQ_TAIL_REGNUM));                \
 444   sp = push_word (sp, read_register (PCSQ_TAIL_REGNUM));                \
 445   write_register (SP_REGNUM, sp);}
 446
 447 /* Discard from the stack the innermost frame,
 448    restoring all saved registers.  */
 449 #define POP_FRAME  \
 450 { register FRAME frame = get_current_frame ();                          \
 451   register CORE_ADDR fp;                                                \
 452   register int regnum;                                                  \
 453   struct frame_saved_regs fsr;                                          \
 454   struct frame_info *fi;                                                \
 455   double freg_buffer;                                                   \
 456   fi = get_frame_info (frame);                                          \
 457   fp = fi->frame;                                                       \
 458   get_frame_saved_regs (fi, &fsr);                                      \
 459   for (regnum = 31; regnum > 0; regnum--)                               \
 460     if (fsr.regs[regnum])                                               \
 461       write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \
 462   for (regnum = NUM_REGS - 1; regnum >= FP0_REGNUM ; regnum--)          \
 463     if (fsr.regs[regnum])                                               \
 464       { read_memory (fsr.regs[regnum], &freg_buffer, 8);                \
 465         write_register_bytes (REGISTER_BYTE (regnum), &freg_buffer, 8); }\
 466   if (fsr.regs[IPSW_REGNUM])                                            \
 467     write_register (IPSW_REGNUM,                                        \
 468                     read_memory_integer (fsr.regs[IPSW_REGNUM], 4));    \
 469   if (fsr.regs[SAR_REGNUM])                                             \
 470     write_register (SAR_REGNUM,                                         \
 471                     read_memory_integer (fsr.regs[SAR_REGNUM], 4));     \
 472   if (fsr.regs[PCOQ_TAIL_REGNUM])                                       \
 473     write_register (PCOQ_TAIL_REGNUM,                                   \
 474                     read_memory_integer (fsr.regs[PCOQ_TAIL_REGNUM], 4));\
 475   if (fsr.regs[PCSQ_TAIL_REGNUM])                                       \
 476     write_register (PCSQ_TAIL_REGNUM,                                   \
 477                     read_memory_integer (fsr.regs[PCSQ_TAIL_REGNUM], 4));\
 478   write_register (FP_REGNUM, read_memory_integer (fp, 4));       \
 479   write_register (SP_REGNUM, fp + 8);                            \
 480   flush_cached_frames ();                                        \
 481   set_current_frame (create_new_frame (read_register (FP_REGNUM),\
 482                                         read_pc ())); }
 483
 484 /* This sequence of words is the instructions
 485
 486 ; Call stack frame has already been built by gdb. Since we could be calling
 487 ; a varargs function, and we do not have the benefit of a stub to put things in
 488 ; the right place, we load the first 4 word of arguments into both the general
 489 ; and fp registers.
 490 call_dummy
 491         ldw -36(sp), arg0
 492         ldw -40(sp), arg1
 493         ldw -44(sp), arg2
 494         ldw -48(sp), arg3
 495         ldo -36(sp), r1
 496         fldws 0(0, r1), fr4
 497         fldds -4(0, r1), fr5
 498         fldws -8(0, r1), fr6
 499         fldds -12(0, r1), fr7
 500         ldil 0, r22                     ; target will be placed here.
 501         ldo 0(r22), r22
 502         ldsid (0,r22), r3
 503         ldil 0, r1                      ; _sr4export will be placed here.
 504         ldo 0(r1), r1
 505         ldsid (0,r1), r4
 506         combt,=,n r3, r4, text_space    ; If target is in data space, do a
 507         ble 0(sr5, r22)                 ; "normal" procedure call
 508         copy r31, r2
 509         break 4, 8
 510 text_space                              ; Otherwise, go through _sr4export,
 511         ble (sr4, r1)                   ; which will return back here.
 512         stw 31,-24(r30)
 513         break 4, 8
 514
 515    The dummy decides if the target is in text space or data space. If
 516    it's in data space, there's no problem because the target can
 517    return back to the dummy. However, if the target is in text space,
 518    the dummy calls the secret, undocumented routine _sr4export, which
 519    calls a function in text space and can return to any space. Instead
 520    of including fake instructions to represent saved registers, we
 521    know that the frame is associated with the call dummy and treat it
 522    specially. */
 523
 524 #define CALL_DUMMY { 0x4bda3fb9, 0x4bd93fb1, 0x4bd83fa9, 0x4bd73fa1,    \
 525                      0x37c13fb9, 0x24201004, 0x2c391005, 0x24311006,    \
 526                      0x2c291007, 0x22c00000, 0x36d60000, 0x02c010a3,    \
 527                      0x20200000, 0x34210000, 0x002010a4, 0x80832012,    \
 528                      0xe6c06000, 0x081f0242, 0x00010004, 0xe4202000,    \
 529                      0x6bdf3fd1, 0x00010004}
 530
 531 #define CALL_DUMMY_LENGTH 88
 532 #define CALL_DUMMY_START_OFFSET 0
 533 /* Insert the specified number of args and function address
 534    into a call sequence of the above form stored at DUMMYNAME.  */
 535
 536 #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \
 537 { static CORE_ADDR sr4export_address = 0;                               \
 538                                                                         \
 539   if (!sr4export_address)                                               \
 540     {                                                                   \
 541       struct minimal_symbol *msymbol;                                   \
 542       msymbol = lookup_minimal_symbol ("_sr4export", (struct objfile *) NULL);\
 543       if (msymbol = NULL)                                               \
 544         error ("Can't find an address for _sr4export trampoline");      \
 545       else                                                              \
 546         sr4export_address = msymbol -> address;                         \
 547     }                                                                   \
 548   dummyname[9] = deposit_21 (fun >> 11, dummyname[9]);                  \
 549   dummyname[10] = deposit_14 (fun & MASK_11, dummyname[10]);            \
 550   dummyname[12] = deposit_21 (sr4export_address >> 11, dummyname[12]);  \
 551   dummyname[13] = deposit_14 (sr4export_address & MASK_11, dummyname[13]);\
 552 }
 553
 554 /* Write the PC to a random value.
 555    On PA-RISC, we need to be sure that the PC space queue is correct. */
 556
 557 #define WRITE_PC(addr) \
 558 { int space_reg, space = ((addr) >> 30);                \
 559   int space_val;                                        \
 560   if (space == 0)                                       \
 561     space_reg = 43;             /* Space reg sr4 */     \
 562   else if (space == 1)                                  \
 563     space_reg = 48;             /* Space reg sr5*/      \
 564   else                                                  \
 565     error ("pc = %x is in illegal space.", addr);       \
 566   space_val = read_register (space_reg);                \
 567   write_register (PCOQ_HEAD_REGNUM, addr);              \
 568   write_register (PCSQ_HEAD_REGNUM, space_val);         \
 569   write_register (PCOQ_TAIL_REGNUM, addr);              \
 570   write_register (PCSQ_TAIL_REGNUM, space_val);}
 571
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