gdb/config/pa/tm-hppa.h

   1 /* Parameters for execution on any Hewlett-Packard PA-RISC machine.
   2    Copyright 1986, 1987, 1989, 1990, 1991, 1992, 1993, 1995
   3    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 This program 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 2 of the License, or
  13 (at your option) any later version.
  14
  15 This program 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 this program; if not, write to the Free Software
  22 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  23
  24 /* Forward declarations of some types we use in prototypes */
  25
  26 #ifdef __STDC__
  27 struct frame_info;
  28 struct frame_saved_regs;
  29 struct value;
  30 struct type;
  31 struct inferior_status;
  32 #endif
  33
  34 /* Target system byte order. */
  35
  36 #define TARGET_BYTE_ORDER       BIG_ENDIAN
  37
  38 /* By default assume we don't have to worry about software floating point.  */
  39 #ifndef SOFT_FLOAT
  40 #define SOFT_FLOAT 0
  41 #endif
  42
  43 /* Get at various relevent fields of an instruction word. */
  44
  45 #define MASK_5 0x1f
  46 #define MASK_11 0x7ff
  47 #define MASK_14 0x3fff
  48 #define MASK_21 0x1fffff
  49
  50 /* This macro gets bit fields using HP's numbering (MSB = 0) */
  51
  52 #define GET_FIELD(X, FROM, TO) \
  53   ((X) >> (31 - (TO)) & ((1 << ((TO) - (FROM) + 1)) - 1))
  54
  55 /* Watch out for NaNs */
  56
  57 #define IEEE_FLOAT
  58
  59 /* On the PA, any pass-by-value structure > 8 bytes is actually
  60    passed via a pointer regardless of its type or the compiler
  61    used.  */
  62
  63 #define REG_STRUCT_HAS_ADDR(gcc_p,type) \
  64   (TYPE_LENGTH (type) > 8)
  65
  66 /* Offset from address of function to start of its code.
  67    Zero on most machines.  */
  68
  69 #define FUNCTION_START_OFFSET 0
  70
  71 /* Advance PC across any function entry prologue instructions
  72    to reach some "real" code.  */
  73
  74 #define SKIP_PROLOGUE(pc) pc = skip_prologue (pc)
  75 extern CORE_ADDR skip_prologue PARAMS ((CORE_ADDR));
  76
  77 /* If PC is in some function-call trampoline code, return the PC
  78    where the function itself actually starts.  If not, return NULL.  */
  79
  80 #define SKIP_TRAMPOLINE_CODE(pc) skip_trampoline_code (pc, NULL)
  81
  82 /* Return non-zero if we are in an appropriate trampoline. */
  83
  84 #define IN_SOLIB_CALL_TRAMPOLINE(pc, name) \
  85    in_solib_call_trampoline (pc, name)
  86 extern int in_solib_call_trampoline PARAMS ((CORE_ADDR, char *));
  87
  88 #define IN_SOLIB_RETURN_TRAMPOLINE(pc, name) \
  89   in_solib_return_trampoline (pc, name)
  90 extern int in_solib_return_trampoline PARAMS ((CORE_ADDR, char *));
  91
  92 /* Immediately after a function call, return the saved pc.
  93    Can't go through the frames for this because on some machines
  94    the new frame is not set up until the new function executes
  95    some instructions.  */
  96
  97 #undef  SAVED_PC_AFTER_CALL
  98 #define SAVED_PC_AFTER_CALL(frame) saved_pc_after_call (frame)
  99 extern CORE_ADDR saved_pc_after_call PARAMS ((struct frame_info *));
 100
 101 /* Stack grows upward */
 102
 103 #define INNER_THAN >
 104
 105 /* Sequence of bytes for breakpoint instruction.  */
 106
 107 #define BREAKPOINT {0x00, 0x01, 0x00, 0x04}
 108
 109 /* Amount PC must be decremented by after a breakpoint.
 110    This is often the number of bytes in BREAKPOINT
 111    but not always.
 112
 113    Not on the PA-RISC */
 114
 115 #define DECR_PC_AFTER_BREAK 0
 116
 117 /* return instruction is bv r0(rp) or bv,n r0(rp)*/
 118
 119 #define ABOUT_TO_RETURN(pc) ((read_memory_integer (pc, 4) | 0x2) == 0xE840C002)
 120
 121 /* Say how long (ordinary) registers are.  This is a piece of bogosity
 122    used in push_word and a few other places; REGISTER_RAW_SIZE is the
 123    real way to know how big a register is.  */
 124
 125 #define REGISTER_SIZE 4
 126
 127 /* Number of machine registers */
 128
 129 #define NUM_REGS 128
 130
 131 /* Initializer for an array of names of registers.
 132    There should be NUM_REGS strings in this initializer.  */
 133
 134 #define REGISTER_NAMES  \
 135  {"flags", "r1", "rp", "r3", "r4", "r5", "r6", "r7", "r8", "r9",        \
 136   "r10", "r11", "r12", "r13", "r14", "r15", "r16", "r17", "r18", "r19", \
 137   "r20", "r21", "r22", "r23", "r24", "r25", "r26", "dp", "ret0", "ret1", \
 138   "sp", "r31", "sar", "pcoqh", "pcsqh", "pcoqt", "pcsqt", \
 139   "eiem", "iir", "isr", "ior", "ipsw", "goto", "sr4", "sr0", "sr1", "sr2", \
 140   "sr3", "sr5", "sr6", "sr7", "cr0", "cr8", "cr9", "ccr", "cr12", "cr13", \
 141   "cr24", "cr25", "cr26", "mpsfu_high", "mpsfu_low", "mpsfu_ovflo", "pad", \
 142   "fpsr", "fpe1", "fpe2", "fpe3", "fpe4", "fpe5", "fpe6", "fpe7", \
 143   "fr4", "fr4R", "fr5", "fr5R", "fr6", "fr6R", "fr7", "fr7R", \
 144   "fr8", "fr8R", "fr9", "fr9R", "fr10", "fr10R", "fr11", "fr11R", \
 145   "fr12", "fr12R", "fr13", "fr13R", "fr14", "fr14R", "fr15", "fr15R", \
 146   "fr16", "fr16R", "fr17", "fr17R", "fr18", "fr18R", "fr19", "fr19R", \
 147   "fr20", "fr20R", "fr21", "fr21R", "fr22", "fr22R", "fr23", "fr23R", \
 148   "fr24", "fr24R", "fr25", "fr25R", "fr26", "fr26R", "fr27", "fr27R", \
 149   "fr28", "fr28R", "fr29", "fr29R", "fr30", "fr30R", "fr31", "fr31R"}
 150
 151 /* Register numbers of various important registers.
 152    Note that some of these values are "real" register numbers,
 153    and correspond to the general registers of the machine,
 154    and some are "phony" register numbers which are too large
 155    to be actual register numbers as far as the user is concerned
 156    but do serve to get the desired values when passed to read_register.  */
 157
 158 #define R0_REGNUM 0             /* Doesn't actually exist, used as base for
 159                                    other r registers.  */
 160 #define FLAGS_REGNUM 0          /* Various status flags */
 161 #define RP_REGNUM 2             /* return pointer */
 162 #define FP_REGNUM 3             /* Contains address of executing stack */
 163                                 /* frame */
 164 #define SP_REGNUM 30            /* Contains address of top of stack */
 165 #define SAR_REGNUM 32           /* Shift Amount Register */
 166 #define IPSW_REGNUM 41          /* Interrupt Processor Status Word */
 167 #define PCOQ_HEAD_REGNUM 33     /* instruction offset queue head */
 168 #define PCSQ_HEAD_REGNUM 34     /* instruction space queue head */
 169 #define PCOQ_TAIL_REGNUM 35     /* instruction offset queue tail */
 170 #define PCSQ_TAIL_REGNUM 36     /* instruction space queue tail */
 171 #define EIEM_REGNUM 37          /* External Interrupt Enable Mask */
 172 #define IIR_REGNUM 38           /* Interrupt Instruction Register */
 173 #define IOR_REGNUM 40           /* Interrupt Offset Register */
 174 #define SR4_REGNUM 43           /* space register 4 */
 175 #define RCR_REGNUM 51           /* Recover Counter (also known as cr0) */
 176 #define CCR_REGNUM 54           /* Coprocessor Configuration Register */
 177 #define TR0_REGNUM 57           /* Temporary Registers (cr24 -> cr31) */
 178 #define FP0_REGNUM 64           /* floating point reg. 0 */
 179 #define FP4_REGNUM 72
 180
 181 /* compatibility with the rest of gdb. */
 182 #define PC_REGNUM PCOQ_HEAD_REGNUM
 183 #define NPC_REGNUM PCOQ_TAIL_REGNUM
 184
 185 /*
 186  * Processor Status Word Masks
 187  */
 188
 189 #define PSW_T   0x01000000      /* Taken Branch Trap Enable */
 190 #define PSW_H   0x00800000      /* Higher-Privilege Transfer Trap Enable */
 191 #define PSW_L   0x00400000      /* Lower-Privilege Transfer Trap Enable */
 192 #define PSW_N   0x00200000      /* PC Queue Front Instruction Nullified */
 193 #define PSW_X   0x00100000      /* Data Memory Break Disable */
 194 #define PSW_B   0x00080000      /* Taken Branch in Previous Cycle */
 195 #define PSW_C   0x00040000      /* Code Address Translation Enable */
 196 #define PSW_V   0x00020000      /* Divide Step Correction */
 197 #define PSW_M   0x00010000      /* High-Priority Machine Check Disable */
 198 #define PSW_CB  0x0000ff00      /* Carry/Borrow Bits */
 199 #define PSW_R   0x00000010      /* Recovery Counter Enable */
 200 #define PSW_Q   0x00000008      /* Interruption State Collection Enable */
 201 #define PSW_P   0x00000004      /* Protection ID Validation Enable */
 202 #define PSW_D   0x00000002      /* Data Address Translation Enable */
 203 #define PSW_I   0x00000001      /* External, Power Failure, Low-Priority */
 204                                 /* Machine Check Interruption Enable */
 205
 206 /* When fetching register values from an inferior or a core file,
 207    clean them up using this macro.  BUF is a char pointer to
 208    the raw value of the register in the registers[] array.  */
 209
 210 #define CLEAN_UP_REGISTER_VALUE(regno, buf) \
 211   do {  \
 212     if ((regno) == PCOQ_HEAD_REGNUM || (regno) == PCOQ_TAIL_REGNUM) \
 213       (buf)[3] &= ~0x3; \
 214   } while (0)
 215
 216 /* Define DO_REGISTERS_INFO() to do machine-specific formatting
 217    of register dumps. */
 218
 219 #define DO_REGISTERS_INFO(_regnum, fp) pa_do_registers_info (_regnum, fp)
 220 extern void pa_do_registers_info PARAMS ((int, int));
 221
 222 /* PA specific macro to see if the current instruction is nullified. */
 223 #ifndef INSTRUCTION_NULLIFIED
 224 #define INSTRUCTION_NULLIFIED ((int)read_register (IPSW_REGNUM) & 0x00200000)
 225 #endif
 226
 227 /* Number of bytes of storage in the actual machine representation
 228    for register N.  On the PA-RISC, all regs are 4 bytes, including
 229    the FP registers (they're accessed as two 4 byte halves).  */
 230
 231 #define REGISTER_RAW_SIZE(N) 4
 232
 233 /* Total amount of space needed to store our copies of the machine's
 234    register state, the array `registers'.  */
 235 #define REGISTER_BYTES (NUM_REGS * 4)
 236
 237 /* Index within `registers' of the first byte of the space for
 238    register N.  */
 239
 240 #define REGISTER_BYTE(N) (N) * 4
 241
 242 /* Number of bytes of storage in the program's representation
 243    for register N. */
 244
 245 #define REGISTER_VIRTUAL_SIZE(N) REGISTER_RAW_SIZE(N)
 246
 247 /* Largest value REGISTER_RAW_SIZE can have.  */
 248
 249 #define MAX_REGISTER_RAW_SIZE 4
 250
 251 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 252
 253 #define MAX_REGISTER_VIRTUAL_SIZE 8
 254
 255 /* Return the GDB type object for the "standard" data type
 256    of data in register N.  */
 257
 258 #define REGISTER_VIRTUAL_TYPE(N) \
 259  ((N) < FP4_REGNUM ? builtin_type_int : builtin_type_float)
 260
 261 /* Store the address of the place in which to copy the structure the
 262    subroutine will return.  This is called from call_function. */
 263
 264 #define STORE_STRUCT_RETURN(ADDR, SP) {write_register (28, (ADDR)); }
 265
 266 /* Extract from an array REGBUF containing the (raw) register state
 267    a function return value of type TYPE, and copy that, in virtual format,
 268    into VALBUF.
 269
 270    FIXME: Not sure what to do for soft float here.  */
 271
 272 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 273   { \
 274     if (TYPE_CODE (TYPE) == TYPE_CODE_FLT && !SOFT_FLOAT) \
 275       memcpy ((VALBUF), \
 276               ((char *)(REGBUF)) + REGISTER_BYTE (FP4_REGNUM), \
 277               TYPE_LENGTH (TYPE)); \
 278     else \
 279       memcpy ((VALBUF), \
 280               (char *)(REGBUF) + REGISTER_BYTE (28) + \
 281               (TYPE_LENGTH (TYPE) >= 4 ? 0 : 4 - TYPE_LENGTH (TYPE)), \
 282               TYPE_LENGTH (TYPE)); \
 283   }
 284
 285 /* Write into appropriate registers a function return value
 286    of type TYPE, given in virtual format.
 287
 288    For software floating point the return value goes into the integer
 289    registers.  But we don't have any flag to key this on, so we always
 290    store the value into the integer registers, and if it's a float value,
 291    then we put it in the float registers too.  */
 292
 293 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 294   write_register_bytes (REGISTER_BYTE (28),(VALBUF), TYPE_LENGTH (TYPE)) ; \
 295   if (!SOFT_FLOAT) \
 296     write_register_bytes ((TYPE_CODE(TYPE) == TYPE_CODE_FLT \
 297                            ? REGISTER_BYTE (FP4_REGNUM) \
 298                            : REGISTER_BYTE (28)),               \
 299                           (VALBUF), TYPE_LENGTH (TYPE))
 300
 301 /* Extract from an array REGBUF containing the (raw) register state
 302    the address in which a function should return its structure value,
 303    as a CORE_ADDR (or an expression that can be used as one).  */
 304
 305 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \
 306   (*(int *)((REGBUF) + REGISTER_BYTE (28)))
 307
 308 /*
 309  * This macro defines the register numbers (from REGISTER_NAMES) that
 310  * are effectively unavailable to the user through ptrace().  It allows
 311  * us to include the whole register set in REGISTER_NAMES (inorder to
 312  * better support remote debugging).  If it is used in
 313  * fetch/store_inferior_registers() gdb will not complain about I/O errors
 314  * on fetching these registers.  If all registers in REGISTER_NAMES
 315  * are available, then return false (0).
 316  */
 317
 318 #define CANNOT_STORE_REGISTER(regno)            \
 319                    ((regno) == 0) ||     \
 320                    ((regno) == PCSQ_HEAD_REGNUM) || \
 321                    ((regno) >= PCSQ_TAIL_REGNUM && (regno) < IPSW_REGNUM) ||  \
 322                    ((regno) > IPSW_REGNUM && (regno) < FP4_REGNUM)
 323
 324 #define INIT_EXTRA_FRAME_INFO(fromleaf, frame) init_extra_frame_info (fromleaf, frame)
 325 extern void init_extra_frame_info PARAMS ((int, struct frame_info *));
 326
 327 /* Describe the pointer in each stack frame to the previous stack frame
 328    (its caller).  */
 329
 330 /* FRAME_CHAIN takes a frame's nominal address
 331    and produces the frame's chain-pointer.
 332
 333    FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address
 334    and produces the nominal address of the caller frame.
 335
 336    However, if FRAME_CHAIN_VALID returns zero,
 337    it means the given frame is the outermost one and has no caller.
 338    In that case, FRAME_CHAIN_COMBINE is not used.  */
 339
 340 /* In the case of the PA-RISC, the frame's nominal address
 341    is the address of a 4-byte word containing the calling frame's
 342    address (previous FP).  */
 343
 344 #define FRAME_CHAIN(thisframe) frame_chain (thisframe)
 345 extern CORE_ADDR frame_chain PARAMS ((struct frame_info *));
 346
 347 #define FRAME_CHAIN_VALID(chain, thisframe) \
 348   frame_chain_valid (chain, thisframe)
 349 extern int frame_chain_valid PARAMS ((CORE_ADDR, struct frame_info *));
 350
 351 #define FRAME_CHAIN_COMBINE(chain, thisframe) (chain)
 352
 353 /* Define other aspects of the stack frame.  */
 354
 355 /* A macro that tells us whether the function invocation represented
 356    by FI does not have a frame on the stack associated with it.  If it
 357    does not, FRAMELESS is set to 1, else 0.  */
 358 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
 359   (FRAMELESS) = frameless_function_invocation(FI)
 360 extern int frameless_function_invocation PARAMS ((struct frame_info *));
 361
 362 #define FRAME_SAVED_PC(FRAME) frame_saved_pc (FRAME)
 363
 364 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
 365
 366 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 367 /* Set VAL to the number of args passed to frame described by FI.
 368    Can set VAL to -1, meaning no way to tell.  */
 369
 370 /* We can't tell how many args there are
 371    now that the C compiler delays popping them.  */
 372 #define FRAME_NUM_ARGS(val,fi) (val = -1)
 373
 374 /* Return number of bytes at start of arglist that are not really args.  */
 375
 376 #define FRAME_ARGS_SKIP 0
 377
 378 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
 379   hppa_frame_find_saved_regs (frame_info, &frame_saved_regs)
 380 extern void
 381 hppa_frame_find_saved_regs PARAMS ((struct frame_info *,
 382                                     struct frame_saved_regs *));
 383
 384 \f
 385 /* Things needed for making the inferior call functions.  */
 386
 387 /* Push an empty stack frame, to record the current PC, etc. */
 388
 389 #define PUSH_DUMMY_FRAME push_dummy_frame (&inf_status)
 390 extern void push_dummy_frame PARAMS ((struct inferior_status *));
 391
 392 /* Discard from the stack the innermost frame,
 393    restoring all saved registers.  */
 394 #define POP_FRAME  hppa_pop_frame ()
 395 extern void hppa_pop_frame PARAMS ((void));
 396
 397 #define INSTRUCTION_SIZE 4
 398
 399 #ifndef PA_LEVEL_0
 400
 401 /* Non-level zero PA's have space registers (but they don't always have
 402    floating-point, do they????  */
 403
 404 /* This sequence of words is the instructions
 405
 406 ; Call stack frame has already been built by gdb. Since we could be calling
 407 ; a varargs function, and we do not have the benefit of a stub to put things in
 408 ; the right place, we load the first 4 word of arguments into both the general
 409 ; and fp registers.
 410 call_dummy
 411         ldw -36(sp), arg0
 412         ldw -40(sp), arg1
 413         ldw -44(sp), arg2
 414         ldw -48(sp), arg3
 415         ldo -36(sp), r1
 416         fldws 0(0, r1), fr4
 417         fldds -4(0, r1), fr5
 418         fldws -8(0, r1), fr6
 419         fldds -12(0, r1), fr7
 420         ldil 0, r22                     ; FUNC_LDIL_OFFSET must point here
 421         ldo 0(r22), r22                 ; FUNC_LDO_OFFSET must point here
 422         ldsid (0,r22), r4
 423         ldil 0, r1                      ; SR4EXPORT_LDIL_OFFSET must point here
 424         ldo 0(r1), r1                   ; SR4EXPORT_LDO_OFFSET must point here
 425         ldsid (0,r1), r20
 426         combt,=,n r4, r20, text_space   ; If target is in data space, do a
 427         ble 0(sr5, r22)                 ; "normal" procedure call
 428         copy r31, r2
 429         break 4, 8
 430         mtsp r21, sr0
 431         ble,n 0(sr0, r22)
 432 text_space                              ; Otherwise, go through _sr4export,
 433         ble (sr4, r1)                   ; which will return back here.
 434         stw r31,-24(r30)
 435         break 4, 8
 436         mtsp r21, sr0
 437         ble,n 0(sr0, r22)
 438         nop                             ; To avoid kernel bugs
 439         nop                             ; and keep the dummy 8 byte aligned
 440
 441    The dummy decides if the target is in text space or data space. If
 442    it's in data space, there's no problem because the target can
 443    return back to the dummy. However, if the target is in text space,
 444    the dummy calls the secret, undocumented routine _sr4export, which
 445    calls a function in text space and can return to any space. Instead
 446    of including fake instructions to represent saved registers, we
 447    know that the frame is associated with the call dummy and treat it
 448    specially.
 449
 450    The trailing NOPs are needed to avoid a bug in HPUX, BSD and OSF1
 451    kernels.   If the memory at the location pointed to by the PC is
 452    0xffffffff then a ptrace step call will fail (even if the instruction
 453    is nullified).
 454
 455    The code to pop a dummy frame single steps three instructions
 456    starting with the last mtsp.  This includes the nullified "instruction"
 457    following the ble (which is uninitialized junk).  If the
 458    "instruction" following the last BLE is 0xffffffff, then the ptrace
 459    will fail and the dummy frame is not correctly popped.
 460
 461    By placing a NOP in the delay slot of the BLE instruction we can be
 462    sure that we never try to execute a 0xffffffff instruction and
 463    avoid the kernel bug.  The second NOP is needed to keep the call
 464    dummy 8 byte aligned.  */
 465
 466 /* Define offsets into the call dummy for the target function address */
 467 #define FUNC_LDIL_OFFSET (INSTRUCTION_SIZE * 9)
 468 #define FUNC_LDO_OFFSET (INSTRUCTION_SIZE * 10)
 469
 470 /* Define offsets into the call dummy for the _sr4export address */
 471 #define SR4EXPORT_LDIL_OFFSET (INSTRUCTION_SIZE * 12)
 472 #define SR4EXPORT_LDO_OFFSET (INSTRUCTION_SIZE * 13)
 473
 474 #define CALL_DUMMY {0x4BDA3FB9, 0x4BD93FB1, 0x4BD83FA9, 0x4BD73FA1,\
 475                     0x37C13FB9, 0x24201004, 0x2C391005, 0x24311006,\
 476                     0x2C291007, 0x22C00000, 0x36D60000, 0x02C010A4,\
 477                     0x20200000, 0x34210000, 0x002010b4, 0x82842022,\
 478                     0xe6c06000, 0x081f0242, 0x00010004, 0x00151820,\
 479                     0xe6c00002, 0xe4202000, 0x6bdf3fd1, 0x00010004,\
 480                     0x00151820, 0xe6c00002, 0x08000240, 0x08000240}
 481
 482 #define CALL_DUMMY_LENGTH (INSTRUCTION_SIZE * 28)
 483
 484 #else /* defined PA_LEVEL_0 */
 485
 486 /* This is the call dummy for a level 0 PA.  Level 0's don't have space
 487    registers (or floating point??), so we skip all that inter-space call stuff,
 488    and avoid touching the fp regs.
 489
 490 call_dummy
 491
 492         ldw -36(%sp), %arg0
 493         ldw -40(%sp), %arg1
 494         ldw -44(%sp), %arg2
 495         ldw -48(%sp), %arg3
 496         ldil 0, %r31                    ; FUNC_LDIL_OFFSET must point here
 497         ldo 0(%r31), %r31               ; FUNC_LDO_OFFSET must point here
 498         ble 0(%sr0, %r31)
 499         copy %r31, %r2
 500         break 4, 8
 501         nop                             ; restore_pc_queue expects these
 502         bv,n 0(%r22)                    ; instructions to be here...
 503         nop
 504 */
 505
 506 /* Define offsets into the call dummy for the target function address */
 507 #define FUNC_LDIL_OFFSET (INSTRUCTION_SIZE * 4)
 508 #define FUNC_LDO_OFFSET (INSTRUCTION_SIZE * 5)
 509
 510 #define CALL_DUMMY {0x4bda3fb9, 0x4bd93fb1, 0x4bd83fa9, 0x4bd73fa1,\
 511                     0x23e00000, 0x37ff0000, 0xe7e00000, 0x081f0242,\
 512                     0x00010004, 0x08000240, 0xeac0c002, 0x08000240}
 513
 514 #define CALL_DUMMY_LENGTH (INSTRUCTION_SIZE * 12)
 515
 516 #endif
 517
 518 #define CALL_DUMMY_START_OFFSET 0
 519
 520 /*
 521  * Insert the specified number of args and function address
 522  * into a call sequence of the above form stored at DUMMYNAME.
 523  *
 524  * On the hppa we need to call the stack dummy through $$dyncall.
 525  * Therefore our version of FIX_CALL_DUMMY takes an extra argument,
 526  * real_pc, which is the location where gdb should start up the
 527  * inferior to do the function call.
 528  */
 529
 530 #define FIX_CALL_DUMMY hppa_fix_call_dummy
 531
 532 extern CORE_ADDR
 533 hppa_fix_call_dummy PARAMS ((char *, CORE_ADDR, CORE_ADDR, int,
 534                              struct value **, struct type *, int));
 535
 536 #define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \
 537     sp = hppa_push_arguments(nargs, args, sp, struct_return, struct_addr)
 538 extern CORE_ADDR
 539 hppa_push_arguments PARAMS ((int, struct value **, CORE_ADDR, int,
 540                              CORE_ADDR));
 541 \f
 542 /* The low two bits of the PC on the PA contain the privilege level.  Some
 543    genius implementing a (non-GCC) compiler apparently decided this means
 544    that "addresses" in a text section therefore include a privilege level,
 545    and thus symbol tables should contain these bits.  This seems like a
 546    bonehead thing to do--anyway, it seems to work for our purposes to just
 547    ignore those bits.  */
 548 #define SMASH_TEXT_ADDRESS(addr) ((addr) &= ~0x3)
 549
 550 #define GDB_TARGET_IS_HPPA
 551
 552 #define BELIEVE_PCC_PROMOTION 1
 553
 554 /*
 555  * Unwind table and descriptor.
 556  */
 557
 558 struct unwind_table_entry {
 559   unsigned int region_start;
 560   unsigned int region_end;
 561
 562   unsigned int Cannot_unwind         :  1;
 563   unsigned int Millicode             :  1;
 564   unsigned int Millicode_save_sr0    :  1;
 565   unsigned int Region_description    :  2;
 566   unsigned int reserved1             :  1;
 567   unsigned int Entry_SR              :  1;
 568   unsigned int Entry_FR              :  4; /* number saved */
 569   unsigned int Entry_GR              :  5; /* number saved */
 570   unsigned int Args_stored           :  1;
 571   unsigned int Variable_Frame        :  1;
 572   unsigned int Separate_Package_Body :  1;
 573   unsigned int Frame_Extension_Millicode:1;
 574   unsigned int Stack_Overflow_Check  :  1;
 575   unsigned int Two_Instruction_SP_Increment:1;
 576   unsigned int Ada_Region            :  1;
 577 /* Use this field to store a stub unwind type.  */
 578 #define stub_type reserved2
 579   unsigned int reserved2             :  4;
 580   unsigned int Save_SP               :  1;
 581   unsigned int Save_RP               :  1;
 582   unsigned int Save_MRP_in_frame     :  1;
 583   unsigned int extn_ptr_defined      :  1;
 584   unsigned int Cleanup_defined       :  1;
 585
 586   unsigned int MPE_XL_interrupt_marker: 1;
 587   unsigned int HP_UX_interrupt_marker:  1;
 588   unsigned int Large_frame           :  1;
 589   unsigned int reserved4             :  2;
 590   unsigned int Total_frame_size      : 27;
 591 };
 592
 593 /* HP linkers also generate unwinds for various linker-generated stubs.
 594    GDB reads in the stubs from the $UNWIND_END$ subspace, then
 595    "converts" them into normal unwind entries using some of the reserved
 596    fields to store the stub type.  */
 597
 598 struct stub_unwind_entry
 599 {
 600   /* The offset within the executable for the associated stub.  */
 601   unsigned stub_offset;
 602
 603   /* The type of stub this unwind entry describes.  */
 604   char type;
 605
 606   /* Unknown.  Not needed by GDB at this time.  */
 607   char prs_info;
 608
 609   /* Length (in instructions) of the associated stub.  */
 610   short stub_length;
 611 };
 612
 613 /* Sizes (in bytes) of the native unwind entries.  */
 614 #define UNWIND_ENTRY_SIZE 16
 615 #define STUB_UNWIND_ENTRY_SIZE 8
 616
 617 /* The gaps represent linker stubs used in MPE and space for future
 618    expansion.  */
 619 enum unwind_stub_types
 620 {
 621   LONG_BRANCH = 1,
 622   PARAMETER_RELOCATION = 2,
 623   EXPORT = 10,
 624   IMPORT = 11,
 625 };
 626
 627
 628 /* Info about the unwind table associated with an object file.  This is hung
 629    off of the objfile->obj_private pointer, and is allocated in the objfile's
 630    psymbol obstack.  This allows us to have unique unwind info for each
 631    executable and shared library that we are debugging.  */
 632
 633 struct obj_unwind_info {
 634   struct unwind_table_entry *table; /* Pointer to unwind info */
 635   struct unwind_table_entry *cache; /* Pointer to last entry we found */
 636   int last;                     /* Index of last entry */
 637 };
 638
 639 #define OBJ_UNWIND_INFO(obj) ((struct obj_unwind_info *)obj->obj_private)
 640
 641 extern CORE_ADDR target_read_pc PARAMS ((int));
 642 extern void target_write_pc PARAMS ((CORE_ADDR, int));
 643 extern CORE_ADDR skip_trampoline_code PARAMS ((CORE_ADDR, char *));
 644
 645 #define TARGET_READ_PC(pid) target_read_pc (pid)
 646 #define TARGET_WRITE_PC(v,pid) target_write_pc (v,pid)
 647
 648 /* For a number of horrible reasons we may have to adjust the location
 649    of variables on the stack.  Ugh.  */
 650 #define HPREAD_ADJUST_STACK_ADDRESS(ADDR) hpread_adjust_stack_address(ADDR)
 651
 652 extern int hpread_adjust_stack_address PARAMS ((CORE_ADDR));
 653
 654 /* If the current gcc for for this target does not produce correct debugging
 655    information for float parameters, both prototyped and unprototyped, then
 656    define this macro.  This forces gdb to  always assume that floats are
 657    passed as doubles and then converted in the callee.
 658
 659    For the pa, it appears that the debug info marks the parameters as
 660    floats regardless of whether the function is prototyped, but the actual
 661    values are passed as doubles for the non-prototyped case and floats for
 662    the prototyped case.  Thus we choose to make the non-prototyped case work
 663    for C and break the prototyped case, since the non-prototyped case is
 664    probably much more common.  (FIXME). */
 665
 666 #define COERCE_FLOAT_TO_DOUBLE (current_language -> la_language == language_c)