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 #define USE_STRUCT_CONVENTION(gcc_p,type) (TYPE_LENGTH (type) > 8)
  67
  68 /* Offset from address of function to start of its code.
  69    Zero on most machines.  */
  70
  71 #define FUNCTION_START_OFFSET 0
  72
  73 /* Advance PC across any function entry prologue instructions
  74    to reach some "real" code.  */
  75
  76 #define SKIP_PROLOGUE(pc) pc = skip_prologue (pc)
  77 extern CORE_ADDR skip_prologue PARAMS ((CORE_ADDR));
  78
  79 /* If PC is in some function-call trampoline code, return the PC
  80    where the function itself actually starts.  If not, return NULL.  */
  81
  82 #define SKIP_TRAMPOLINE_CODE(pc) skip_trampoline_code (pc, NULL)
  83
  84 /* Return non-zero if we are in an appropriate trampoline. */
  85
  86 #define IN_SOLIB_CALL_TRAMPOLINE(pc, name) \
  87    in_solib_call_trampoline (pc, name)
  88 extern int in_solib_call_trampoline PARAMS ((CORE_ADDR, char *));
  89
  90 #define IN_SOLIB_RETURN_TRAMPOLINE(pc, name) \
  91   in_solib_return_trampoline (pc, name)
  92 extern int in_solib_return_trampoline PARAMS ((CORE_ADDR, char *));
  93
  94 /* Immediately after a function call, return the saved pc.
  95    Can't go through the frames for this because on some machines
  96    the new frame is not set up until the new function executes
  97    some instructions.  */
  98
  99 #undef  SAVED_PC_AFTER_CALL
 100 #define SAVED_PC_AFTER_CALL(frame) saved_pc_after_call (frame)
 101 extern CORE_ADDR saved_pc_after_call PARAMS ((struct frame_info *));
 102
 103 /* Stack grows upward */
 104
 105 #define INNER_THAN >
 106
 107 /* Sequence of bytes for breakpoint instruction.  */
 108
 109 #define BREAKPOINT {0x00, 0x01, 0x00, 0x04}
 110
 111 /* Amount PC must be decremented by after a breakpoint.
 112    This is often the number of bytes in BREAKPOINT
 113    but not always.
 114
 115    Not on the PA-RISC */
 116
 117 #define DECR_PC_AFTER_BREAK 0
 118
 119 /* return instruction is bv r0(rp) or bv,n r0(rp)*/
 120
 121 #define ABOUT_TO_RETURN(pc) ((read_memory_integer (pc, 4) | 0x2) == 0xE840C002)
 122
 123 /* Say how long (ordinary) registers are.  This is a piece of bogosity
 124    used in push_word and a few other places; REGISTER_RAW_SIZE is the
 125    real way to know how big a register is.  */
 126
 127 #define REGISTER_SIZE 4
 128
 129 /* Number of machine registers */
 130
 131 #define NUM_REGS 128
 132
 133 /* Initializer for an array of names of registers.
 134    There should be NUM_REGS strings in this initializer.  */
 135
 136 #define REGISTER_NAMES  \
 137  {"flags", "r1", "rp", "r3", "r4", "r5", "r6", "r7", "r8", "r9",        \
 138   "r10", "r11", "r12", "r13", "r14", "r15", "r16", "r17", "r18", "r19", \
 139   "r20", "r21", "r22", "r23", "r24", "r25", "r26", "dp", "ret0", "ret1", \
 140   "sp", "r31", "sar", "pcoqh", "pcsqh", "pcoqt", "pcsqt", \
 141   "eiem", "iir", "isr", "ior", "ipsw", "goto", "sr4", "sr0", "sr1", "sr2", \
 142   "sr3", "sr5", "sr6", "sr7", "cr0", "cr8", "cr9", "ccr", "cr12", "cr13", \
 143   "cr24", "cr25", "cr26", "mpsfu_high", "mpsfu_low", "mpsfu_ovflo", "pad", \
 144   "fpsr", "fpe1", "fpe2", "fpe3", "fpe4", "fpe5", "fpe6", "fpe7", \
 145   "fr4", "fr4R", "fr5", "fr5R", "fr6", "fr6R", "fr7", "fr7R", \
 146   "fr8", "fr8R", "fr9", "fr9R", "fr10", "fr10R", "fr11", "fr11R", \
 147   "fr12", "fr12R", "fr13", "fr13R", "fr14", "fr14R", "fr15", "fr15R", \
 148   "fr16", "fr16R", "fr17", "fr17R", "fr18", "fr18R", "fr19", "fr19R", \
 149   "fr20", "fr20R", "fr21", "fr21R", "fr22", "fr22R", "fr23", "fr23R", \
 150   "fr24", "fr24R", "fr25", "fr25R", "fr26", "fr26R", "fr27", "fr27R", \
 151   "fr28", "fr28R", "fr29", "fr29R", "fr30", "fr30R", "fr31", "fr31R"}
 152
 153 /* Register numbers of various important registers.
 154    Note that some of these values are "real" register numbers,
 155    and correspond to the general registers of the machine,
 156    and some are "phony" register numbers which are too large
 157    to be actual register numbers as far as the user is concerned
 158    but do serve to get the desired values when passed to read_register.  */
 159
 160 #define R0_REGNUM 0             /* Doesn't actually exist, used as base for
 161                                    other r registers.  */
 162 #define FLAGS_REGNUM 0          /* Various status flags */
 163 #define RP_REGNUM 2             /* return pointer */
 164 #define FP_REGNUM 3             /* Contains address of executing stack */
 165                                 /* frame */
 166 #define SP_REGNUM 30            /* Contains address of top of stack */
 167 #define SAR_REGNUM 32           /* Shift Amount Register */
 168 #define IPSW_REGNUM 41          /* Interrupt Processor Status Word */
 169 #define PCOQ_HEAD_REGNUM 33     /* instruction offset queue head */
 170 #define PCSQ_HEAD_REGNUM 34     /* instruction space queue head */
 171 #define PCOQ_TAIL_REGNUM 35     /* instruction offset queue tail */
 172 #define PCSQ_TAIL_REGNUM 36     /* instruction space queue tail */
 173 #define EIEM_REGNUM 37          /* External Interrupt Enable Mask */
 174 #define IIR_REGNUM 38           /* Interrupt Instruction Register */
 175 #define IOR_REGNUM 40           /* Interrupt Offset Register */
 176 #define SR4_REGNUM 43           /* space register 4 */
 177 #define RCR_REGNUM 51           /* Recover Counter (also known as cr0) */
 178 #define CCR_REGNUM 54           /* Coprocessor Configuration Register */
 179 #define TR0_REGNUM 57           /* Temporary Registers (cr24 -> cr31) */
 180 #define FP0_REGNUM 64           /* floating point reg. 0 */
 181 #define FP4_REGNUM 72
 182
 183 /* compatibility with the rest of gdb. */
 184 #define PC_REGNUM PCOQ_HEAD_REGNUM
 185 #define NPC_REGNUM PCOQ_TAIL_REGNUM
 186
 187 /*
 188  * Processor Status Word Masks
 189  */
 190
 191 #define PSW_T   0x01000000      /* Taken Branch Trap Enable */
 192 #define PSW_H   0x00800000      /* Higher-Privilege Transfer Trap Enable */
 193 #define PSW_L   0x00400000      /* Lower-Privilege Transfer Trap Enable */
 194 #define PSW_N   0x00200000      /* PC Queue Front Instruction Nullified */
 195 #define PSW_X   0x00100000      /* Data Memory Break Disable */
 196 #define PSW_B   0x00080000      /* Taken Branch in Previous Cycle */
 197 #define PSW_C   0x00040000      /* Code Address Translation Enable */
 198 #define PSW_V   0x00020000      /* Divide Step Correction */
 199 #define PSW_M   0x00010000      /* High-Priority Machine Check Disable */
 200 #define PSW_CB  0x0000ff00      /* Carry/Borrow Bits */
 201 #define PSW_R   0x00000010      /* Recovery Counter Enable */
 202 #define PSW_Q   0x00000008      /* Interruption State Collection Enable */
 203 #define PSW_P   0x00000004      /* Protection ID Validation Enable */
 204 #define PSW_D   0x00000002      /* Data Address Translation Enable */
 205 #define PSW_I   0x00000001      /* External, Power Failure, Low-Priority */
 206                                 /* Machine Check Interruption Enable */
 207
 208 /* When fetching register values from an inferior or a core file,
 209    clean them up using this macro.  BUF is a char pointer to
 210    the raw value of the register in the registers[] array.  */
 211
 212 #define CLEAN_UP_REGISTER_VALUE(regno, buf) \
 213   do {  \
 214     if ((regno) == PCOQ_HEAD_REGNUM || (regno) == PCOQ_TAIL_REGNUM) \
 215       (buf)[3] &= ~0x3; \
 216   } while (0)
 217
 218 /* Define DO_REGISTERS_INFO() to do machine-specific formatting
 219    of register dumps. */
 220
 221 #define DO_REGISTERS_INFO(_regnum, fp) pa_do_registers_info (_regnum, fp)
 222 extern void pa_do_registers_info PARAMS ((int, int));
 223
 224 /* PA specific macro to see if the current instruction is nullified. */
 225 #ifndef INSTRUCTION_NULLIFIED
 226 #define INSTRUCTION_NULLIFIED ((int)read_register (IPSW_REGNUM) & 0x00200000)
 227 #endif
 228
 229 /* Number of bytes of storage in the actual machine representation
 230    for register N.  On the PA-RISC, all regs are 4 bytes, including
 231    the FP registers (they're accessed as two 4 byte halves).  */
 232
 233 #define REGISTER_RAW_SIZE(N) 4
 234
 235 /* Total amount of space needed to store our copies of the machine's
 236    register state, the array `registers'.  */
 237 #define REGISTER_BYTES (NUM_REGS * 4)
 238
 239 /* Index within `registers' of the first byte of the space for
 240    register N.  */
 241
 242 #define REGISTER_BYTE(N) (N) * 4
 243
 244 /* Number of bytes of storage in the program's representation
 245    for register N. */
 246
 247 #define REGISTER_VIRTUAL_SIZE(N) REGISTER_RAW_SIZE(N)
 248
 249 /* Largest value REGISTER_RAW_SIZE can have.  */
 250
 251 #define MAX_REGISTER_RAW_SIZE 4
 252
 253 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 254
 255 #define MAX_REGISTER_VIRTUAL_SIZE 8
 256
 257 /* Return the GDB type object for the "standard" data type
 258    of data in register N.  */
 259
 260 #define REGISTER_VIRTUAL_TYPE(N) \
 261  ((N) < FP4_REGNUM ? builtin_type_int : builtin_type_float)
 262
 263 /* Store the address of the place in which to copy the structure the
 264    subroutine will return.  This is called from call_function. */
 265
 266 #define STORE_STRUCT_RETURN(ADDR, SP) {write_register (28, (ADDR)); }
 267
 268 /* Extract from an array REGBUF containing the (raw) register state
 269    a function return value of type TYPE, and copy that, in virtual format,
 270    into VALBUF.
 271
 272    FIXME: Not sure what to do for soft float here.  */
 273
 274 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 275   { \
 276     if (TYPE_CODE (TYPE) == TYPE_CODE_FLT && !SOFT_FLOAT) \
 277       memcpy ((VALBUF), \
 278               ((char *)(REGBUF)) + REGISTER_BYTE (FP4_REGNUM), \
 279               TYPE_LENGTH (TYPE)); \
 280     else \
 281       memcpy ((VALBUF), \
 282               (char *)(REGBUF) + REGISTER_BYTE (28) + \
 283               (TYPE_LENGTH (TYPE) >= 4 ? 0 : 4 - TYPE_LENGTH (TYPE)), \
 284               TYPE_LENGTH (TYPE)); \
 285   }
 286
 287 /* Write into appropriate registers a function return value
 288    of type TYPE, given in virtual format.
 289
 290    For software floating point the return value goes into the integer
 291    registers.  But we don't have any flag to key this on, so we always
 292    store the value into the integer registers, and if it's a float value,
 293    then we put it in the float registers too.  */
 294
 295 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 296   write_register_bytes (REGISTER_BYTE (28),(VALBUF), TYPE_LENGTH (TYPE)) ; \
 297   if (!SOFT_FLOAT) \
 298     write_register_bytes ((TYPE_CODE(TYPE) == TYPE_CODE_FLT \
 299                            ? REGISTER_BYTE (FP4_REGNUM) \
 300                            : REGISTER_BYTE (28)),               \
 301                           (VALBUF), TYPE_LENGTH (TYPE))
 302
 303 /* Extract from an array REGBUF containing the (raw) register state
 304    the address in which a function should return its structure value,
 305    as a CORE_ADDR (or an expression that can be used as one).  */
 306
 307 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \
 308   (*(int *)((REGBUF) + REGISTER_BYTE (28)))
 309
 310 /*
 311  * This macro defines the register numbers (from REGISTER_NAMES) that
 312  * are effectively unavailable to the user through ptrace().  It allows
 313  * us to include the whole register set in REGISTER_NAMES (inorder to
 314  * better support remote debugging).  If it is used in
 315  * fetch/store_inferior_registers() gdb will not complain about I/O errors
 316  * on fetching these registers.  If all registers in REGISTER_NAMES
 317  * are available, then return false (0).
 318  */
 319
 320 #define CANNOT_STORE_REGISTER(regno)            \
 321                    ((regno) == 0) ||     \
 322                    ((regno) == PCSQ_HEAD_REGNUM) || \
 323                    ((regno) >= PCSQ_TAIL_REGNUM && (regno) < IPSW_REGNUM) ||  \
 324                    ((regno) > IPSW_REGNUM && (regno) < FP4_REGNUM)
 325
 326 #define INIT_EXTRA_FRAME_INFO(fromleaf, frame) init_extra_frame_info (fromleaf, frame)
 327 extern void init_extra_frame_info PARAMS ((int, struct frame_info *));
 328
 329 /* Describe the pointer in each stack frame to the previous stack frame
 330    (its caller).  */
 331
 332 /* FRAME_CHAIN takes a frame's nominal address
 333    and produces the frame's chain-pointer.
 334
 335    FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address
 336    and produces the nominal address of the caller frame.
 337
 338    However, if FRAME_CHAIN_VALID returns zero,
 339    it means the given frame is the outermost one and has no caller.
 340    In that case, FRAME_CHAIN_COMBINE is not used.  */
 341
 342 /* In the case of the PA-RISC, the frame's nominal address
 343    is the address of a 4-byte word containing the calling frame's
 344    address (previous FP).  */
 345
 346 #define FRAME_CHAIN(thisframe) frame_chain (thisframe)
 347 extern CORE_ADDR frame_chain PARAMS ((struct frame_info *));
 348
 349 #define FRAME_CHAIN_VALID(chain, thisframe) \
 350   frame_chain_valid (chain, thisframe)
 351 extern int frame_chain_valid PARAMS ((CORE_ADDR, struct frame_info *));
 352
 353 #define FRAME_CHAIN_COMBINE(chain, thisframe) (chain)
 354
 355 /* Define other aspects of the stack frame.  */
 356
 357 /* A macro that tells us whether the function invocation represented
 358    by FI does not have a frame on the stack associated with it.  If it
 359    does not, FRAMELESS is set to 1, else 0.  */
 360 #define FRAMELESS_FUNCTION_INVOCATION(FI, FRAMELESS) \
 361   (FRAMELESS) = frameless_function_invocation(FI)
 362 extern int frameless_function_invocation PARAMS ((struct frame_info *));
 363
 364 #define FRAME_SAVED_PC(FRAME) frame_saved_pc (FRAME)
 365
 366 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
 367
 368 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 369 /* Set VAL to the number of args passed to frame described by FI.
 370    Can set VAL to -1, meaning no way to tell.  */
 371
 372 /* We can't tell how many args there are
 373    now that the C compiler delays popping them.  */
 374 #define FRAME_NUM_ARGS(val,fi) (val = -1)
 375
 376 /* Return number of bytes at start of arglist that are not really args.  */
 377
 378 #define FRAME_ARGS_SKIP 0
 379
 380 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
 381   hppa_frame_find_saved_regs (frame_info, &frame_saved_regs)
 382 extern void
 383 hppa_frame_find_saved_regs PARAMS ((struct frame_info *,
 384                                     struct frame_saved_regs *));
 385
 386 \f
 387 /* Things needed for making the inferior call functions.  */
 388
 389 /* Push an empty stack frame, to record the current PC, etc. */
 390
 391 #define PUSH_DUMMY_FRAME push_dummy_frame (&inf_status)
 392 extern void push_dummy_frame PARAMS ((struct inferior_status *));
 393
 394 /* Discard from the stack the innermost frame,
 395    restoring all saved registers.  */
 396 #define POP_FRAME  hppa_pop_frame ()
 397 extern void hppa_pop_frame PARAMS ((void));
 398
 399 #define INSTRUCTION_SIZE 4
 400
 401 #ifndef PA_LEVEL_0
 402
 403 /* Non-level zero PA's have space registers (but they don't always have
 404    floating-point, do they????  */
 405
 406 /* This sequence of words is the instructions
 407
 408 ; Call stack frame has already been built by gdb. Since we could be calling
 409 ; a varargs function, and we do not have the benefit of a stub to put things in
 410 ; the right place, we load the first 4 word of arguments into both the general
 411 ; and fp registers.
 412 call_dummy
 413         ldw -36(sp), arg0
 414         ldw -40(sp), arg1
 415         ldw -44(sp), arg2
 416         ldw -48(sp), arg3
 417         ldo -36(sp), r1
 418         fldws 0(0, r1), fr4
 419         fldds -4(0, r1), fr5
 420         fldws -8(0, r1), fr6
 421         fldds -12(0, r1), fr7
 422         ldil 0, r22                     ; FUNC_LDIL_OFFSET must point here
 423         ldo 0(r22), r22                 ; FUNC_LDO_OFFSET must point here
 424         ldsid (0,r22), r4
 425         ldil 0, r1                      ; SR4EXPORT_LDIL_OFFSET must point here
 426         ldo 0(r1), r1                   ; SR4EXPORT_LDO_OFFSET must point here
 427         ldsid (0,r1), r20
 428         combt,=,n r4, r20, text_space   ; If target is in data space, do a
 429         ble 0(sr5, r22)                 ; "normal" procedure call
 430         copy r31, r2
 431         break 4, 8
 432         mtsp r21, sr0
 433         ble,n 0(sr0, r22)
 434 text_space                              ; Otherwise, go through _sr4export,
 435         ble (sr4, r1)                   ; which will return back here.
 436         stw r31,-24(r30)
 437         break 4, 8
 438         mtsp r21, sr0
 439         ble,n 0(sr0, r22)
 440         nop                             ; To avoid kernel bugs
 441         nop                             ; and keep the dummy 8 byte aligned
 442
 443    The dummy decides if the target is in text space or data space. If
 444    it's in data space, there's no problem because the target can
 445    return back to the dummy. However, if the target is in text space,
 446    the dummy calls the secret, undocumented routine _sr4export, which
 447    calls a function in text space and can return to any space. Instead
 448    of including fake instructions to represent saved registers, we
 449    know that the frame is associated with the call dummy and treat it
 450    specially.
 451
 452    The trailing NOPs are needed to avoid a bug in HPUX, BSD and OSF1
 453    kernels.   If the memory at the location pointed to by the PC is
 454    0xffffffff then a ptrace step call will fail (even if the instruction
 455    is nullified).
 456
 457    The code to pop a dummy frame single steps three instructions
 458    starting with the last mtsp.  This includes the nullified "instruction"
 459    following the ble (which is uninitialized junk).  If the
 460    "instruction" following the last BLE is 0xffffffff, then the ptrace
 461    will fail and the dummy frame is not correctly popped.
 462
 463    By placing a NOP in the delay slot of the BLE instruction we can be
 464    sure that we never try to execute a 0xffffffff instruction and
 465    avoid the kernel bug.  The second NOP is needed to keep the call
 466    dummy 8 byte aligned.  */
 467
 468 /* Define offsets into the call dummy for the target function address */
 469 #define FUNC_LDIL_OFFSET (INSTRUCTION_SIZE * 9)
 470 #define FUNC_LDO_OFFSET (INSTRUCTION_SIZE * 10)
 471
 472 /* Define offsets into the call dummy for the _sr4export address */
 473 #define SR4EXPORT_LDIL_OFFSET (INSTRUCTION_SIZE * 12)
 474 #define SR4EXPORT_LDO_OFFSET (INSTRUCTION_SIZE * 13)
 475
 476 #define CALL_DUMMY {0x4BDA3FB9, 0x4BD93FB1, 0x4BD83FA9, 0x4BD73FA1,\
 477                     0x37C13FB9, 0x24201004, 0x2C391005, 0x24311006,\
 478                     0x2C291007, 0x22C00000, 0x36D60000, 0x02C010A4,\
 479                     0x20200000, 0x34210000, 0x002010b4, 0x82842022,\
 480                     0xe6c06000, 0x081f0242, 0x00010004, 0x00151820,\
 481                     0xe6c00002, 0xe4202000, 0x6bdf3fd1, 0x00010004,\
 482                     0x00151820, 0xe6c00002, 0x08000240, 0x08000240}
 483
 484 #define CALL_DUMMY_LENGTH (INSTRUCTION_SIZE * 28)
 485
 486 #else /* defined PA_LEVEL_0 */
 487
 488 /* This is the call dummy for a level 0 PA.  Level 0's don't have space
 489    registers (or floating point??), so we skip all that inter-space call stuff,
 490    and avoid touching the fp regs.
 491
 492 call_dummy
 493
 494         ldw -36(%sp), %arg0
 495         ldw -40(%sp), %arg1
 496         ldw -44(%sp), %arg2
 497         ldw -48(%sp), %arg3
 498         ldil 0, %r31                    ; FUNC_LDIL_OFFSET must point here
 499         ldo 0(%r31), %r31               ; FUNC_LDO_OFFSET must point here
 500         ble 0(%sr0, %r31)
 501         copy %r31, %r2
 502         break 4, 8
 503         nop                             ; restore_pc_queue expects these
 504         bv,n 0(%r22)                    ; instructions to be here...
 505         nop
 506 */
 507
 508 /* Define offsets into the call dummy for the target function address */
 509 #define FUNC_LDIL_OFFSET (INSTRUCTION_SIZE * 4)
 510 #define FUNC_LDO_OFFSET (INSTRUCTION_SIZE * 5)
 511
 512 #define CALL_DUMMY {0x4bda3fb9, 0x4bd93fb1, 0x4bd83fa9, 0x4bd73fa1,\
 513                     0x23e00000, 0x37ff0000, 0xe7e00000, 0x081f0242,\
 514                     0x00010004, 0x08000240, 0xeac0c002, 0x08000240}
 515
 516 #define CALL_DUMMY_LENGTH (INSTRUCTION_SIZE * 12)
 517
 518 #endif
 519
 520 #define CALL_DUMMY_START_OFFSET 0
 521
 522 /*
 523  * Insert the specified number of args and function address
 524  * into a call sequence of the above form stored at DUMMYNAME.
 525  *
 526  * On the hppa we need to call the stack dummy through $$dyncall.
 527  * Therefore our version of FIX_CALL_DUMMY takes an extra argument,
 528  * real_pc, which is the location where gdb should start up the
 529  * inferior to do the function call.
 530  */
 531
 532 #define FIX_CALL_DUMMY hppa_fix_call_dummy
 533
 534 extern CORE_ADDR
 535 hppa_fix_call_dummy PARAMS ((char *, CORE_ADDR, CORE_ADDR, int,
 536                              struct value **, struct type *, int));
 537
 538 #define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \
 539     sp = hppa_push_arguments(nargs, args, sp, struct_return, struct_addr)
 540 extern CORE_ADDR
 541 hppa_push_arguments PARAMS ((int, struct value **, CORE_ADDR, int,
 542                              CORE_ADDR));
 543 \f
 544 /* The low two bits of the PC on the PA contain the privilege level.  Some
 545    genius implementing a (non-GCC) compiler apparently decided this means
 546    that "addresses" in a text section therefore include a privilege level,
 547    and thus symbol tables should contain these bits.  This seems like a
 548    bonehead thing to do--anyway, it seems to work for our purposes to just
 549    ignore those bits.  */
 550 #define SMASH_TEXT_ADDRESS(addr) ((addr) &= ~0x3)
 551
 552 #define GDB_TARGET_IS_HPPA
 553
 554 #define BELIEVE_PCC_PROMOTION 1
 555
 556 /*
 557  * Unwind table and descriptor.
 558  */
 559
 560 struct unwind_table_entry {
 561   unsigned int region_start;
 562   unsigned int region_end;
 563
 564   unsigned int Cannot_unwind         :  1;
 565   unsigned int Millicode             :  1;
 566   unsigned int Millicode_save_sr0    :  1;
 567   unsigned int Region_description    :  2;
 568   unsigned int reserved1             :  1;
 569   unsigned int Entry_SR              :  1;
 570   unsigned int Entry_FR              :  4; /* number saved */
 571   unsigned int Entry_GR              :  5; /* number saved */
 572   unsigned int Args_stored           :  1;
 573   unsigned int Variable_Frame        :  1;
 574   unsigned int Separate_Package_Body :  1;
 575   unsigned int Frame_Extension_Millicode:1;
 576   unsigned int Stack_Overflow_Check  :  1;
 577   unsigned int Two_Instruction_SP_Increment:1;
 578   unsigned int Ada_Region            :  1;
 579 /* Use this field to store a stub unwind type.  */
 580 #define stub_type reserved2
 581   unsigned int reserved2             :  4;
 582   unsigned int Save_SP               :  1;
 583   unsigned int Save_RP               :  1;
 584   unsigned int Save_MRP_in_frame     :  1;
 585   unsigned int extn_ptr_defined      :  1;
 586   unsigned int Cleanup_defined       :  1;
 587
 588   unsigned int MPE_XL_interrupt_marker: 1;
 589   unsigned int HP_UX_interrupt_marker:  1;
 590   unsigned int Large_frame           :  1;
 591   unsigned int reserved4             :  2;
 592   unsigned int Total_frame_size      : 27;
 593 };
 594
 595 /* HP linkers also generate unwinds for various linker-generated stubs.
 596    GDB reads in the stubs from the $UNWIND_END$ subspace, then
 597    "converts" them into normal unwind entries using some of the reserved
 598    fields to store the stub type.  */
 599
 600 struct stub_unwind_entry
 601 {
 602   /* The offset within the executable for the associated stub.  */
 603   unsigned stub_offset;
 604
 605   /* The type of stub this unwind entry describes.  */
 606   char type;
 607
 608   /* Unknown.  Not needed by GDB at this time.  */
 609   char prs_info;
 610
 611   /* Length (in instructions) of the associated stub.  */
 612   short stub_length;
 613 };
 614
 615 /* Sizes (in bytes) of the native unwind entries.  */
 616 #define UNWIND_ENTRY_SIZE 16
 617 #define STUB_UNWIND_ENTRY_SIZE 8
 618
 619 /* The gaps represent linker stubs used in MPE and space for future
 620    expansion.  */
 621 enum unwind_stub_types
 622 {
 623   LONG_BRANCH = 1,
 624   PARAMETER_RELOCATION = 2,
 625   EXPORT = 10,
 626   IMPORT = 11,
 627 };
 628
 629
 630 /* Info about the unwind table associated with an object file.  This is hung
 631    off of the objfile->obj_private pointer, and is allocated in the objfile's
 632    psymbol obstack.  This allows us to have unique unwind info for each
 633    executable and shared library that we are debugging.  */
 634
 635 struct obj_unwind_info {
 636   struct unwind_table_entry *table; /* Pointer to unwind info */
 637   struct unwind_table_entry *cache; /* Pointer to last entry we found */
 638   int last;                     /* Index of last entry */
 639 };
 640
 641 #define OBJ_UNWIND_INFO(obj) ((struct obj_unwind_info *)obj->obj_private)
 642
 643 extern CORE_ADDR target_read_pc PARAMS ((int));
 644 extern void target_write_pc PARAMS ((CORE_ADDR, int));
 645 extern CORE_ADDR skip_trampoline_code PARAMS ((CORE_ADDR, char *));
 646
 647 #define TARGET_READ_PC(pid) target_read_pc (pid)
 648 #define TARGET_WRITE_PC(v,pid) target_write_pc (v,pid)
 649
 650 /* For a number of horrible reasons we may have to adjust the location
 651    of variables on the stack.  Ugh.  */
 652 #define HPREAD_ADJUST_STACK_ADDRESS(ADDR) hpread_adjust_stack_address(ADDR)
 653
 654 extern int hpread_adjust_stack_address PARAMS ((CORE_ADDR));
 655
 656 /* If the current gcc for for this target does not produce correct debugging
 657    information for float parameters, both prototyped and unprototyped, then
 658    define this macro.  This forces gdb to  always assume that floats are
 659    passed as doubles and then converted in the callee.
 660
 661    For the pa, it appears that the debug info marks the parameters as
 662    floats regardless of whether the function is prototyped, but the actual
 663    values are passed as doubles for the non-prototyped case and floats for
 664    the prototyped case.  Thus we choose to make the non-prototyped case work
 665    for C and break the prototyped case, since the non-prototyped case is
 666    probably much more common.  (FIXME). */
 667
 668 #define COERCE_FLOAT_TO_DOUBLE (current_language -> la_language == language_c)
 669
 670 #define STACK_ALIGN(ADDR) (((ADDR) + 7) & -8)