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, 1999
   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,
  23    Boston, MA 02111-1307, USA.  */
  24
  25 /* Forward declarations of some types we use in prototypes */
  26
  27 #ifdef __STDC__
  28 struct frame_info;
  29 struct frame_saved_regs;
  30 struct value;
  31 struct type;
  32 struct inferior_status;
  33 #endif
  34
  35 /* Target system byte order. */
  36
  37 #define TARGET_BYTE_ORDER       BIG_ENDIAN
  38
  39 /* By default assume we don't have to worry about software floating point.  */
  40 #ifndef SOFT_FLOAT
  41 #define SOFT_FLOAT 0
  42 #endif
  43
  44 /* Get at various relevent fields of an instruction word. */
  45
  46 #define MASK_5 0x1f
  47 #define MASK_11 0x7ff
  48 #define MASK_14 0x3fff
  49 #define MASK_21 0x1fffff
  50
  51 /* This macro gets bit fields using HP's numbering (MSB = 0) */
  52 #ifndef GET_FIELD
  53 #define GET_FIELD(X, FROM, TO) \
  54   ((X) >> (31 - (TO)) & ((1 << ((TO) - (FROM) + 1)) - 1))
  55 #endif
  56
  57 /* Watch out for NaNs */
  58
  59 #define IEEE_FLOAT
  60
  61 /* On the PA, any pass-by-value structure > 8 bytes is actually
  62    passed via a pointer regardless of its type or the compiler
  63    used.  */
  64
  65 #define REG_STRUCT_HAS_ADDR(gcc_p,type) \
  66   (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 extern CORE_ADDR hppa_skip_prologue PARAMS ((CORE_ADDR));
  77 #define SKIP_PROLOGUE(pc) (hppa_skip_prologue (pc))
  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 extern CORE_ADDR skip_trampoline_code PARAMS ((CORE_ADDR, char *));
  84
  85 /* Return non-zero if we are in an appropriate trampoline. */
  86
  87 #define IN_SOLIB_CALL_TRAMPOLINE(pc, name) \
  88    in_solib_call_trampoline (pc, name)
  89 extern int in_solib_call_trampoline PARAMS ((CORE_ADDR, char *));
  90
  91 #define IN_SOLIB_RETURN_TRAMPOLINE(pc, name) \
  92   in_solib_return_trampoline (pc, name)
  93 extern int in_solib_return_trampoline PARAMS ((CORE_ADDR, char *));
  94
  95 /* Immediately after a function call, return the saved pc.
  96    Can't go through the frames for this because on some machines
  97    the new frame is not set up until the new function executes
  98    some instructions.  */
  99
 100 #undef  SAVED_PC_AFTER_CALL
 101 #define SAVED_PC_AFTER_CALL(frame) saved_pc_after_call (frame)
 102 extern CORE_ADDR saved_pc_after_call PARAMS ((struct frame_info *));
 103
 104 /* Stack grows upward */
 105 #define INNER_THAN(lhs,rhs) ((lhs) > (rhs))
 106
 107 /* elz: adjust the quantity to the next highest value which is 64-bit aligned.
 108    This is used in valops.c, when the sp is adjusted.
 109    On hppa the sp must always be kept 64-bit aligned */
 110
 111 #define STACK_ALIGN(arg) ( ((arg)%8) ? (((arg)+7)&-8) : (arg))
 112 #define NO_EXTRA_ALIGNMENT_NEEDED 1
 113
 114 /* Sequence of bytes for breakpoint instruction.  */
 115
 116 #define BREAKPOINT {0x00, 0x01, 0x00, 0x04}
 117 #define BREAKPOINT32 0x10004
 118
 119 /* Amount PC must be decremented by after a breakpoint.
 120    This is often the number of bytes in BREAKPOINT
 121    but not always.
 122
 123    Not on the PA-RISC */
 124
 125 #define DECR_PC_AFTER_BREAK 0
 126
 127 /* Sometimes we may pluck out a minimal symbol that has a negative
 128    address.
 129
 130    An example of this occurs when an a.out is linked against a foo.sl.
 131    The foo.sl defines a global bar(), and the a.out declares a signature
 132    for bar().  However, the a.out doesn't directly call bar(), but passes
 133    its address in another call.
 134
 135    If you have this scenario and attempt to "break bar" before running,
 136    gdb will find a minimal symbol for bar() in the a.out.  But that
 137    symbol's address will be negative.  What this appears to denote is
 138    an index backwards from the base of the procedure linkage table (PLT)
 139    into the data linkage table (DLT), the end of which is contiguous
 140    with the start of the PLT.  This is clearly not a valid address for
 141    us to set a breakpoint on.
 142
 143    Note that one must be careful in how one checks for a negative address.
 144    0xc0000000 is a legitimate address of something in a shared text
 145    segment, for example.  Since I don't know what the possible range
 146    is of these "really, truly negative" addresses that come from the
 147    minimal symbols, I'm resorting to the gross hack of checking the
 148    top byte of the address for all 1's.  Sigh.
 149  */
 150 #define PC_REQUIRES_RUN_BEFORE_USE(pc) \
 151   (! target_has_stack && (pc & 0xFF000000))
 152
 153 /* return instruction is bv r0(rp) or bv,n r0(rp) */
 154
 155 #define ABOUT_TO_RETURN(pc) ((read_memory_integer (pc, 4) | 0x2) == 0xE840C002)
 156
 157 /* Say how long (ordinary) registers are.  This is a piece of bogosity
 158    used in push_word and a few other places; REGISTER_RAW_SIZE is the
 159    real way to know how big a register is.  */
 160
 161 #define REGISTER_SIZE 4
 162
 163 /* Number of machine registers */
 164
 165 #define NUM_REGS 128
 166
 167 /* Initializer for an array of names of registers.
 168    There should be NUM_REGS strings in this initializer.
 169    They are in rows of eight entries  */
 170
 171 #define REGISTER_NAMES  \
 172  {"flags",  "r1",      "rp",      "r3",    "r4",     "r5",      "r6",     "r7",    \
 173   "r8",     "r9",      "r10",     "r11",   "r12",    "r13",     "r14",    "r15",   \
 174   "r16",    "r17",     "r18",     "r19",   "r20",    "r21",     "r22",    "r23",   \
 175   "r24",    "r25",     "r26",     "dp",    "ret0",   "ret1",    "sp",     "r31",   \
 176   "sar",    "pcoqh",   "pcsqh",   "pcoqt", "pcsqt",  "eiem",    "iir",    "isr",   \
 177   "ior",    "ipsw",    "goto",    "sr4",   "sr0",    "sr1",     "sr2",    "sr3",   \
 178   "sr5",    "sr6",     "sr7",     "cr0",   "cr8",    "cr9",     "ccr",    "cr12",  \
 179   "cr13",   "cr24",    "cr25",    "cr26",  "mpsfu_high","mpsfu_low","mpsfu_ovflo","pad",\
 180   "fpsr",    "fpe1",   "fpe2",    "fpe3",  "fpe4",   "fpe5",    "fpe6",   "fpe7",  \
 181   "fr4",     "fr4R",   "fr5",     "fr5R",  "fr6",    "fr6R",    "fr7",    "fr7R",  \
 182   "fr8",     "fr8R",   "fr9",     "fr9R",  "fr10",   "fr10R",   "fr11",   "fr11R", \
 183   "fr12",    "fr12R",  "fr13",    "fr13R", "fr14",   "fr14R",   "fr15",   "fr15R", \
 184   "fr16",    "fr16R",  "fr17",    "fr17R", "fr18",   "fr18R",   "fr19",   "fr19R", \
 185   "fr20",    "fr20R",  "fr21",    "fr21R", "fr22",   "fr22R",   "fr23",   "fr23R", \
 186   "fr24",    "fr24R",  "fr25",    "fr25R", "fr26",   "fr26R",   "fr27",   "fr27R", \
 187   "fr28",    "fr28R",  "fr29",    "fr29R", "fr30",   "fr30R",   "fr31",   "fr31R"}
 188
 189 /* Register numbers of various important registers.
 190    Note that some of these values are "real" register numbers,
 191    and correspond to the general registers of the machine,
 192    and some are "phony" register numbers which are too large
 193    to be actual register numbers as far as the user is concerned
 194    but do serve to get the desired values when passed to read_register.  */
 195
 196 #define R0_REGNUM 0             /* Doesn't actually exist, used as base for
 197                                    other r registers.  */
 198 #define FLAGS_REGNUM 0          /* Various status flags */
 199 #define RP_REGNUM 2             /* return pointer */
 200 #define FP_REGNUM 3             /* Contains address of executing stack */
 201                                 /* frame */
 202 #define SP_REGNUM 30            /* Contains address of top of stack */
 203 #define SAR_REGNUM 32           /* Shift Amount Register */
 204 #define IPSW_REGNUM 41          /* Interrupt Processor Status Word */
 205 #define PCOQ_HEAD_REGNUM 33     /* instruction offset queue head */
 206 #define PCSQ_HEAD_REGNUM 34     /* instruction space queue head */
 207 #define PCOQ_TAIL_REGNUM 35     /* instruction offset queue tail */
 208 #define PCSQ_TAIL_REGNUM 36     /* instruction space queue tail */
 209 #define EIEM_REGNUM 37          /* External Interrupt Enable Mask */
 210 #define IIR_REGNUM 38           /* Interrupt Instruction Register */
 211 #define IOR_REGNUM 40           /* Interrupt Offset Register */
 212 #define SR4_REGNUM 43           /* space register 4 */
 213 #define RCR_REGNUM 51           /* Recover Counter (also known as cr0) */
 214 #define CCR_REGNUM 54           /* Coprocessor Configuration Register */
 215 #define TR0_REGNUM 57           /* Temporary Registers (cr24 -> cr31) */
 216 #define CR27_REGNUM 60          /* Base register for thread-local storage, cr27 */
 217 #define FP0_REGNUM 64           /* floating point reg. 0 (fspr) */
 218 #define FP4_REGNUM 72
 219
 220 #define ARG0_REGNUM 26          /* The first argument of a callee. */
 221 #define ARG1_REGNUM 25          /* The second argument of a callee. */
 222 #define ARG2_REGNUM 24          /* The third argument of a callee. */
 223 #define ARG3_REGNUM 23          /* The fourth argument of a callee. */
 224
 225 /* compatibility with the rest of gdb. */
 226 #define PC_REGNUM PCOQ_HEAD_REGNUM
 227 #define NPC_REGNUM PCOQ_TAIL_REGNUM
 228
 229 /*
 230  * Processor Status Word Masks
 231  */
 232
 233 #define PSW_T   0x01000000      /* Taken Branch Trap Enable */
 234 #define PSW_H   0x00800000      /* Higher-Privilege Transfer Trap Enable */
 235 #define PSW_L   0x00400000      /* Lower-Privilege Transfer Trap Enable */
 236 #define PSW_N   0x00200000      /* PC Queue Front Instruction Nullified */
 237 #define PSW_X   0x00100000      /* Data Memory Break Disable */
 238 #define PSW_B   0x00080000      /* Taken Branch in Previous Cycle */
 239 #define PSW_C   0x00040000      /* Code Address Translation Enable */
 240 #define PSW_V   0x00020000      /* Divide Step Correction */
 241 #define PSW_M   0x00010000      /* High-Priority Machine Check Disable */
 242 #define PSW_CB  0x0000ff00      /* Carry/Borrow Bits */
 243 #define PSW_R   0x00000010      /* Recovery Counter Enable */
 244 #define PSW_Q   0x00000008      /* Interruption State Collection Enable */
 245 #define PSW_P   0x00000004      /* Protection ID Validation Enable */
 246 #define PSW_D   0x00000002      /* Data Address Translation Enable */
 247 #define PSW_I   0x00000001      /* External, Power Failure, Low-Priority */
 248                                 /* Machine Check Interruption Enable */
 249
 250 /* When fetching register values from an inferior or a core file,
 251    clean them up using this macro.  BUF is a char pointer to
 252    the raw value of the register in the registers[] array.  */
 253
 254 #define CLEAN_UP_REGISTER_VALUE(regno, buf) \
 255   do {  \
 256     if ((regno) == PCOQ_HEAD_REGNUM || (regno) == PCOQ_TAIL_REGNUM) \
 257       (buf)[sizeof(CORE_ADDR) -1] &= ~0x3; \
 258   } while (0)
 259
 260 /* Define DO_REGISTERS_INFO() to do machine-specific formatting
 261    of register dumps. */
 262
 263 #define DO_REGISTERS_INFO(_regnum, fp) pa_do_registers_info (_regnum, fp)
 264 extern void pa_do_registers_info PARAMS ((int, int));
 265
 266 #if 0
 267 #define STRCAT_REGISTER(regnum, fpregs, stream, precision) pa_do_strcat_registers_info (regnum, fpregs, stream, precision)
 268 extern void pa_do_strcat_registers_info PARAMS ((int, int, GDB_FILE *, enum precision_type));
 269 #endif
 270
 271 /* PA specific macro to see if the current instruction is nullified. */
 272 #ifndef INSTRUCTION_NULLIFIED
 273 #define INSTRUCTION_NULLIFIED \
 274     (((int)read_register (IPSW_REGNUM) & 0x00200000) && \
 275      !((int)read_register (FLAGS_REGNUM) & 0x2))
 276 #endif
 277
 278 /* Number of bytes of storage in the actual machine representation
 279    for register N.  On the PA-RISC, all regs are 4 bytes, including
 280    the FP registers (they're accessed as two 4 byte halves).  */
 281
 282 #define REGISTER_RAW_SIZE(N) 4
 283
 284 /* Total amount of space needed to store our copies of the machine's
 285    register state, the array `registers'.  */
 286 #define REGISTER_BYTES (NUM_REGS * 4)
 287
 288 /* Index within `registers' of the first byte of the space for
 289    register N.  */
 290
 291 #define REGISTER_BYTE(N) (N) * 4
 292
 293 /* Number of bytes of storage in the program's representation
 294    for register N. */
 295
 296 #define REGISTER_VIRTUAL_SIZE(N) REGISTER_RAW_SIZE(N)
 297
 298 /* Largest value REGISTER_RAW_SIZE can have.  */
 299
 300 #define MAX_REGISTER_RAW_SIZE 4
 301
 302 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 303
 304 #define MAX_REGISTER_VIRTUAL_SIZE 8
 305
 306 /* Return the GDB type object for the "standard" data type
 307    of data in register N.  */
 308
 309 #define REGISTER_VIRTUAL_TYPE(N) \
 310  ((N) < FP4_REGNUM ? builtin_type_int : builtin_type_float)
 311
 312 /* Store the address of the place in which to copy the structure the
 313    subroutine will return.  This is called from call_function. */
 314
 315 #define STORE_STRUCT_RETURN(ADDR, SP) {write_register (28, (ADDR)); }
 316
 317 /* Extract from an array REGBUF containing the (raw) register state
 318    a function return value of type TYPE, and copy that, in virtual format,
 319    into VALBUF.
 320
 321    elz: changed what to return when length is > 4: the stored result is
 322    in register 28 and in register 29, with the lower order word being in reg 29,
 323    so we must start reading it from somehere in the middle of reg28
 324
 325    FIXME: Not sure what to do for soft float here.  */
 326
 327 #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 328   { \
 329     if (TYPE_CODE (TYPE) == TYPE_CODE_FLT && !SOFT_FLOAT) \
 330       memcpy ((VALBUF), \
 331               ((char *)(REGBUF)) + REGISTER_BYTE (FP4_REGNUM), \
 332               TYPE_LENGTH (TYPE)); \
 333     else \
 334       memcpy ((VALBUF), \
 335               (char *)(REGBUF) + REGISTER_BYTE (28) + \
 336               (TYPE_LENGTH (TYPE) > 4 ? (8 - TYPE_LENGTH (TYPE)) : (4 - TYPE_LENGTH (TYPE))), \
 337               TYPE_LENGTH (TYPE)); \
 338   }
 339
 340
 341  /* elz: decide whether the function returning a value of type type
 342     will put it on the stack or in the registers.
 343     The pa calling convention says that:
 344     register 28 (called ret0 by gdb) contains any ASCII char,
 345     and any non_floating point value up to 32-bits.
 346     reg 28 and 29 contain non-floating point up tp 64 bits and larger
 347     than 32 bits. (higer order word in reg 28).
 348     fr4: floating point up to 64 bits
 349     sr1: space identifier (32-bit)
 350     stack: any lager than 64-bit, with the address in r28
 351   */
 352 extern use_struct_convention_fn hppa_use_struct_convention;
 353 #define USE_STRUCT_CONVENTION(gcc_p,type) hppa_use_struct_convention (gcc_p,type)
 354
 355 /* Write into appropriate registers a function return value
 356    of type TYPE, given in virtual format.
 357
 358    For software floating point the return value goes into the integer
 359    registers.  But we don't have any flag to key this on, so we always
 360    store the value into the integer registers, and if it's a float value,
 361    then we put it in the float registers too.  */
 362
 363 #define STORE_RETURN_VALUE(TYPE,VALBUF) \
 364   write_register_bytes (REGISTER_BYTE (28),(VALBUF), TYPE_LENGTH (TYPE)) ; \
 365   if (!SOFT_FLOAT) \
 366     write_register_bytes ((TYPE_CODE(TYPE) == TYPE_CODE_FLT \
 367                            ? REGISTER_BYTE (FP4_REGNUM) \
 368                            : REGISTER_BYTE (28)),               \
 369                           (VALBUF), TYPE_LENGTH (TYPE))
 370
 371 /* Extract from an array REGBUF containing the (raw) register state
 372    the address in which a function should return its structure value,
 373    as a CORE_ADDR (or an expression that can be used as one).  */
 374
 375 #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \
 376   (*(int *)((REGBUF) + REGISTER_BYTE (28)))
 377
 378 /* elz: Return a large value, which is stored on the stack at addr.
 379    This is defined only for the hppa, at this moment.
 380    The above macro EXTRACT_STRUCT_VALUE_ADDRESS is not called anymore,
 381    because it assumes that on exit from a called function which returns
 382    a large structure on the stack, the address of the ret structure is
 383    still in register 28. Unfortunately this register is usually overwritten
 384    by the called function itself, on hppa. This is specified in the calling
 385    convention doc. As far as I know, the only way to get the return value
 386    is to have the caller tell us where it told the callee to put it, rather
 387    than have the callee tell us.
 388  */
 389 #define VALUE_RETURNED_FROM_STACK(valtype,addr) \
 390   hppa_value_returned_from_stack (valtype, addr)
 391
 392 /*
 393  * This macro defines the register numbers (from REGISTER_NAMES) that
 394  * are effectively unavailable to the user through ptrace().  It allows
 395  * us to include the whole register set in REGISTER_NAMES (inorder to
 396  * better support remote debugging).  If it is used in
 397  * fetch/store_inferior_registers() gdb will not complain about I/O errors
 398  * on fetching these registers.  If all registers in REGISTER_NAMES
 399  * are available, then return false (0).
 400  */
 401
 402 #define CANNOT_STORE_REGISTER(regno)            \
 403                    ((regno) == 0) ||     \
 404                    ((regno) == PCSQ_HEAD_REGNUM) || \
 405                    ((regno) >= PCSQ_TAIL_REGNUM && (regno) < IPSW_REGNUM) ||  \
 406                    ((regno) > IPSW_REGNUM && (regno) < FP4_REGNUM)
 407
 408 #define INIT_EXTRA_FRAME_INFO(fromleaf, frame) init_extra_frame_info (fromleaf, frame)
 409 extern void init_extra_frame_info PARAMS ((int, struct frame_info *));
 410
 411 /* Describe the pointer in each stack frame to the previous stack frame
 412    (its caller).  */
 413
 414 /* FRAME_CHAIN takes a frame's nominal address
 415    and produces the frame's chain-pointer.
 416
 417    FRAME_CHAIN_COMBINE takes the chain pointer and the frame's nominal address
 418    and produces the nominal address of the caller frame.
 419
 420    However, if FRAME_CHAIN_VALID returns zero,
 421    it means the given frame is the outermost one and has no caller.
 422    In that case, FRAME_CHAIN_COMBINE is not used.  */
 423
 424 /* In the case of the PA-RISC, the frame's nominal address
 425    is the address of a 4-byte word containing the calling frame's
 426    address (previous FP).  */
 427
 428 #define FRAME_CHAIN(thisframe) frame_chain (thisframe)
 429 extern CORE_ADDR frame_chain PARAMS ((struct frame_info *));
 430
 431 extern int hppa_frame_chain_valid PARAMS ((CORE_ADDR, struct frame_info *));
 432 #define FRAME_CHAIN_VALID(chain, thisframe) hppa_frame_chain_valid (chain, thisframe)
 433
 434 #define FRAME_CHAIN_COMBINE(chain, thisframe) (chain)
 435
 436 /* Define other aspects of the stack frame.  */
 437
 438 /* A macro that tells us whether the function invocation represented
 439    by FI does not have a frame on the stack associated with it.  If it
 440    does not, FRAMELESS is set to 1, else 0.  */
 441 #define FRAMELESS_FUNCTION_INVOCATION(FI) \
 442   (frameless_function_invocation (FI))
 443 extern int frameless_function_invocation PARAMS ((struct frame_info *));
 444
 445 extern CORE_ADDR hppa_frame_saved_pc PARAMS ((struct frame_info * frame));
 446 #define FRAME_SAVED_PC(FRAME) hppa_frame_saved_pc (FRAME)
 447
 448 #define FRAME_ARGS_ADDRESS(fi) ((fi)->frame)
 449
 450 #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame)
 451 /* Set VAL to the number of args passed to frame described by FI.
 452    Can set VAL to -1, meaning no way to tell.  */
 453
 454 /* We can't tell how many args there are
 455    now that the C compiler delays popping them.  */
 456 #define FRAME_NUM_ARGS(fi) (-1)
 457
 458 /* Return number of bytes at start of arglist that are not really args.  */
 459
 460 #define FRAME_ARGS_SKIP 0
 461
 462 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
 463   hppa_frame_find_saved_regs (frame_info, &frame_saved_regs)
 464 extern void
 465 hppa_frame_find_saved_regs PARAMS ((struct frame_info *,
 466                                     struct frame_saved_regs *));
 467 \f
 468
 469 /* Things needed for making the inferior call functions.  */
 470
 471 /* Push an empty stack frame, to record the current PC, etc. */
 472
 473 #define PUSH_DUMMY_FRAME push_dummy_frame (inf_status)
 474 extern void push_dummy_frame PARAMS ((struct inferior_status *));
 475
 476 /* Discard from the stack the innermost frame,
 477    restoring all saved registers.  */
 478 #define POP_FRAME  hppa_pop_frame ()
 479 extern void hppa_pop_frame PARAMS ((void));
 480
 481 #define INSTRUCTION_SIZE 4
 482
 483 #ifndef PA_LEVEL_0
 484
 485 /* Non-level zero PA's have space registers (but they don't always have
 486    floating-point, do they????  */
 487
 488 /* This sequence of words is the instructions
 489
 490    ; Call stack frame has already been built by gdb. Since we could be calling
 491    ; a varargs function, and we do not have the benefit of a stub to put things in
 492    ; the right place, we load the first 4 word of arguments into both the general
 493    ; and fp registers.
 494    call_dummy
 495    ldw -36(sp), arg0
 496    ldw -40(sp), arg1
 497    ldw -44(sp), arg2
 498    ldw -48(sp), arg3
 499    ldo -36(sp), r1
 500    fldws 0(0, r1), fr4
 501    fldds -4(0, r1), fr5
 502    fldws -8(0, r1), fr6
 503    fldds -12(0, r1), fr7
 504    ldil 0, r22                  ; FUNC_LDIL_OFFSET must point here
 505    ldo 0(r22), r22                      ; FUNC_LDO_OFFSET must point here
 506    ldsid (0,r22), r4
 507    ldil 0, r1                   ; SR4EXPORT_LDIL_OFFSET must point here
 508    ldo 0(r1), r1                        ; SR4EXPORT_LDO_OFFSET must point here
 509    ldsid (0,r1), r20
 510    combt,=,n r4, r20, text_space        ; If target is in data space, do a
 511    ble 0(sr5, r22)                      ; "normal" procedure call
 512    copy r31, r2
 513    break 4, 8
 514    mtsp r21, sr0
 515    ble,n 0(sr0, r22)
 516    text_space                           ; Otherwise, go through _sr4export,
 517    ble (sr4, r1)                        ; which will return back here.
 518    stw r31,-24(r30)
 519    break 4, 8
 520    mtsp r21, sr0
 521    ble,n 0(sr0, r22)
 522    nop                          ; To avoid kernel bugs
 523    nop                          ; and keep the dummy 8 byte aligned
 524
 525    The dummy decides if the target is in text space or data space. If
 526    it's in data space, there's no problem because the target can
 527    return back to the dummy. However, if the target is in text space,
 528    the dummy calls the secret, undocumented routine _sr4export, which
 529    calls a function in text space and can return to any space. Instead
 530    of including fake instructions to represent saved registers, we
 531    know that the frame is associated with the call dummy and treat it
 532    specially.
 533
 534    The trailing NOPs are needed to avoid a bug in HPUX, BSD and OSF1
 535    kernels.   If the memory at the location pointed to by the PC is
 536    0xffffffff then a ptrace step call will fail (even if the instruction
 537    is nullified).
 538
 539    The code to pop a dummy frame single steps three instructions
 540    starting with the last mtsp.  This includes the nullified "instruction"
 541    following the ble (which is uninitialized junk).  If the
 542    "instruction" following the last BLE is 0xffffffff, then the ptrace
 543    will fail and the dummy frame is not correctly popped.
 544
 545    By placing a NOP in the delay slot of the BLE instruction we can be
 546    sure that we never try to execute a 0xffffffff instruction and
 547    avoid the kernel bug.  The second NOP is needed to keep the call
 548    dummy 8 byte aligned.  */
 549
 550 /* Define offsets into the call dummy for the target function address */
 551 #define FUNC_LDIL_OFFSET (INSTRUCTION_SIZE * 9)
 552 #define FUNC_LDO_OFFSET (INSTRUCTION_SIZE * 10)
 553
 554 /* Define offsets into the call dummy for the _sr4export address */
 555 #define SR4EXPORT_LDIL_OFFSET (INSTRUCTION_SIZE * 12)
 556 #define SR4EXPORT_LDO_OFFSET (INSTRUCTION_SIZE * 13)
 557
 558 #define CALL_DUMMY {0x4BDA3FB9, 0x4BD93FB1, 0x4BD83FA9, 0x4BD73FA1,\
 559                     0x37C13FB9, 0x24201004, 0x2C391005, 0x24311006,\
 560                     0x2C291007, 0x22C00000, 0x36D60000, 0x02C010A4,\
 561                     0x20200000, 0x34210000, 0x002010b4, 0x82842022,\
 562                     0xe6c06000, 0x081f0242, 0x00010004, 0x00151820,\
 563                     0xe6c00002, 0xe4202000, 0x6bdf3fd1, 0x00010004,\
 564                     0x00151820, 0xe6c00002, 0x08000240, 0x08000240}
 565
 566 #define CALL_DUMMY_LENGTH (INSTRUCTION_SIZE * 28)
 567 #define REG_PARM_STACK_SPACE 16
 568
 569 #else /* defined PA_LEVEL_0 */
 570
 571 /* This is the call dummy for a level 0 PA.  Level 0's don't have space
 572    registers (or floating point??), so we skip all that inter-space call stuff,
 573    and avoid touching the fp regs.
 574
 575    call_dummy
 576
 577    ldw -36(%sp), %arg0
 578    ldw -40(%sp), %arg1
 579    ldw -44(%sp), %arg2
 580    ldw -48(%sp), %arg3
 581    ldil 0, %r31                 ; FUNC_LDIL_OFFSET must point here
 582    ldo 0(%r31), %r31            ; FUNC_LDO_OFFSET must point here
 583    ble 0(%sr0, %r31)
 584    copy %r31, %r2
 585    break 4, 8
 586    nop                          ; restore_pc_queue expects these
 587    bv,n 0(%r22)                 ; instructions to be here...
 588    nop
 589  */
 590
 591 /* Define offsets into the call dummy for the target function address */
 592 #define FUNC_LDIL_OFFSET (INSTRUCTION_SIZE * 4)
 593 #define FUNC_LDO_OFFSET (INSTRUCTION_SIZE * 5)
 594
 595 #define CALL_DUMMY {0x4bda3fb9, 0x4bd93fb1, 0x4bd83fa9, 0x4bd73fa1,\
 596                     0x23e00000, 0x37ff0000, 0xe7e00000, 0x081f0242,\
 597                     0x00010004, 0x08000240, 0xeac0c002, 0x08000240}
 598
 599 #define CALL_DUMMY_LENGTH (INSTRUCTION_SIZE * 12)
 600
 601 #endif
 602
 603 #define CALL_DUMMY_START_OFFSET 0
 604
 605 /* If we've reached a trap instruction within the call dummy, then
 606    we'll consider that to mean that we've reached the call dummy's
 607    end after its successful completion. */
 608 #define CALL_DUMMY_HAS_COMPLETED(pc, sp, frame_address) \
 609   (PC_IN_CALL_DUMMY((pc), (sp), (frame_address)) && \
 610    (read_memory_integer((pc), 4) == BREAKPOINT32))
 611
 612 /*
 613  * Insert the specified number of args and function address
 614  * into a call sequence of the above form stored at DUMMYNAME.
 615  *
 616  * On the hppa we need to call the stack dummy through $$dyncall.
 617  * Therefore our version of FIX_CALL_DUMMY takes an extra argument,
 618  * real_pc, which is the location where gdb should start up the
 619  * inferior to do the function call.
 620  */
 621
 622 #define FIX_CALL_DUMMY hppa_fix_call_dummy
 623
 624 extern CORE_ADDR
 625   hppa_fix_call_dummy PARAMS ((char *, CORE_ADDR, CORE_ADDR, int,
 626                                struct value **, struct type *, int));
 627
 628 #define PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \
 629   (hppa_push_arguments((nargs), (args), (sp), (struct_return), (struct_addr)))
 630 extern CORE_ADDR
 631   hppa_push_arguments PARAMS ((int, struct value **, CORE_ADDR, int,
 632                                CORE_ADDR));
 633 \f
 634 /* The low two bits of the PC on the PA contain the privilege level.  Some
 635    genius implementing a (non-GCC) compiler apparently decided this means
 636    that "addresses" in a text section therefore include a privilege level,
 637    and thus symbol tables should contain these bits.  This seems like a
 638    bonehead thing to do--anyway, it seems to work for our purposes to just
 639    ignore those bits.  */
 640 #define SMASH_TEXT_ADDRESS(addr) ((addr) &= ~0x3)
 641
 642 #define GDB_TARGET_IS_HPPA
 643
 644 #define BELIEVE_PCC_PROMOTION 1
 645
 646 /*
 647  * Unwind table and descriptor.
 648  */
 649
 650 struct unwind_table_entry
 651   {
 652     CORE_ADDR region_start;
 653     CORE_ADDR region_end;
 654
 655     unsigned int Cannot_unwind:1;       /* 0 */
 656     unsigned int Millicode:1;   /* 1 */
 657     unsigned int Millicode_save_sr0:1;  /* 2 */
 658     unsigned int Region_description:2;  /* 3..4 */
 659     unsigned int reserved1:1;   /* 5 */
 660     unsigned int Entry_SR:1;    /* 6 */
 661     unsigned int Entry_FR:4;    /* number saved *//* 7..10 */
 662     unsigned int Entry_GR:5;    /* number saved *//* 11..15 */
 663     unsigned int Args_stored:1; /* 16 */
 664     unsigned int Variable_Frame:1;      /* 17 */
 665     unsigned int Separate_Package_Body:1;       /* 18 */
 666     unsigned int Frame_Extension_Millicode:1;   /* 19 */
 667     unsigned int Stack_Overflow_Check:1;        /* 20 */
 668     unsigned int Two_Instruction_SP_Increment:1;        /* 21 */
 669     unsigned int Ada_Region:1;  /* 22 */
 670     unsigned int cxx_info:1;    /* 23 */
 671     unsigned int cxx_try_catch:1;       /* 24 */
 672     unsigned int sched_entry_seq:1;     /* 25 */
 673     unsigned int reserved2:1;   /* 26 */
 674     unsigned int Save_SP:1;     /* 27 */
 675     unsigned int Save_RP:1;     /* 28 */
 676     unsigned int Save_MRP_in_frame:1;   /* 29 */
 677     unsigned int extn_ptr_defined:1;    /* 30 */
 678     unsigned int Cleanup_defined:1;     /* 31 */
 679
 680     unsigned int MPE_XL_interrupt_marker:1;     /* 0 */
 681     unsigned int HP_UX_interrupt_marker:1;      /* 1 */
 682     unsigned int Large_frame:1; /* 2 */
 683     unsigned int Pseudo_SP_Set:1;       /* 3 */
 684     unsigned int reserved4:1;   /* 4 */
 685     unsigned int Total_frame_size:27;   /* 5..31 */
 686
 687     /* This is *NOT* part of an actual unwind_descriptor in an object
 688        file.  It is *ONLY* part of the "internalized" descriptors that
 689        we create from those in a file.
 690      */
 691     struct
 692       {
 693         unsigned int stub_type:4;       /* 0..3 */
 694         unsigned int padding:28;        /* 4..31 */
 695       }
 696     stub_unwind;
 697   };
 698
 699 /* HP linkers also generate unwinds for various linker-generated stubs.
 700    GDB reads in the stubs from the $UNWIND_END$ subspace, then
 701    "converts" them into normal unwind entries using some of the reserved
 702    fields to store the stub type.  */
 703
 704 struct stub_unwind_entry
 705   {
 706     /* The offset within the executable for the associated stub.  */
 707     unsigned stub_offset;
 708
 709     /* The type of stub this unwind entry describes.  */
 710     char type;
 711
 712     /* Unknown.  Not needed by GDB at this time.  */
 713     char prs_info;
 714
 715     /* Length (in instructions) of the associated stub.  */
 716     short stub_length;
 717   };
 718
 719 /* Sizes (in bytes) of the native unwind entries.  */
 720 #define UNWIND_ENTRY_SIZE 16
 721 #define STUB_UNWIND_ENTRY_SIZE 8
 722
 723 /* The gaps represent linker stubs used in MPE and space for future
 724    expansion.  */
 725 enum unwind_stub_types
 726   {
 727     LONG_BRANCH = 1,
 728     PARAMETER_RELOCATION = 2,
 729     EXPORT = 10,
 730     IMPORT = 11,
 731     IMPORT_SHLIB = 12,
 732   };
 733
 734 /* We use the objfile->obj_private pointer for two things:
 735
 736  * 1.  An unwind table;
 737  *
 738  * 2.  A pointer to any associated shared library object.
 739  *
 740  * #defines are used to help refer to these objects.
 741  */
 742
 743 /* Info about the unwind table associated with an object file.
 744
 745  * This is hung off of the "objfile->obj_private" pointer, and
 746  * is allocated in the objfile's psymbol obstack.  This allows
 747  * us to have unique unwind info for each executable and shared
 748  * library that we are debugging.
 749  */
 750 struct obj_unwind_info
 751   {
 752     struct unwind_table_entry *table;   /* Pointer to unwind info */
 753     struct unwind_table_entry *cache;   /* Pointer to last entry we found */
 754     int last;                   /* Index of last entry */
 755   };
 756
 757 typedef struct data {
 758   CORE_ADDR dummy[2];
 759   CORE_ADDR func_addr;
 760   CORE_ADDR dp;
 761 } opd_data;
 762
 763 typedef struct obj_private_struct
 764   {
 765     struct obj_unwind_info *unwind_info;        /* a pointer */
 766     struct so_list *so_info;    /* a pointer  */
 767     opd_data *opd;
 768     int n_opd_entries;
 769   }
 770 obj_private_data_t;
 771
 772 #if 0
 773 extern void target_write_pc
 774 PARAMS ((CORE_ADDR, int))
 775      extern CORE_ADDR target_read_pc PARAMS ((int));
 776      extern CORE_ADDR skip_trampoline_code PARAMS ((CORE_ADDR, char *));
 777 #endif
 778
 779 #define TARGET_READ_PC(pid) target_read_pc (pid)
 780      extern CORE_ADDR target_read_pc PARAMS ((int));
 781
 782 #define TARGET_WRITE_PC(v,pid) target_write_pc (v,pid)
 783      extern void target_write_pc PARAMS ((CORE_ADDR, int));
 784
 785 #define TARGET_READ_FP() target_read_fp (inferior_pid)
 786      extern CORE_ADDR target_read_fp PARAMS ((int));
 787
 788 /* For a number of horrible reasons we may have to adjust the location
 789    of variables on the stack.  Ugh.  */
 790 #define HPREAD_ADJUST_STACK_ADDRESS(ADDR) hpread_adjust_stack_address(ADDR)
 791
 792      extern int hpread_adjust_stack_address PARAMS ((CORE_ADDR));
 793
 794 /* If the current gcc for for this target does not produce correct debugging
 795    information for float parameters, both prototyped and unprototyped, then
 796    define this macro.  This forces gdb to  always assume that floats are
 797    passed as doubles and then converted in the callee.
 798
 799    For the pa, it appears that the debug info marks the parameters as
 800    floats regardless of whether the function is prototyped, but the actual
 801    values are passed as doubles for the non-prototyped case and floats for
 802    the prototyped case.  Thus we choose to make the non-prototyped case work
 803    for C and break the prototyped case, since the non-prototyped case is
 804    probably much more common.  (FIXME). */
 805
 806 #define COERCE_FLOAT_TO_DOUBLE (current_language -> la_language == language_c)