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, 1994, 1995, 1996,
   3    1998, 1999, 2000, 2001, 2002, 2003 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 #include "regcache.h"
  26
  27 #define GDB_MULTI_ARCH 0
  28
  29 /* NOTE: cagney/2002-11-24: This is a guess.  */
  30 #define DEPRECATED_USE_GENERIC_DUMMY_FRAMES 0
  31 #define CALL_DUMMY_LOCATION ON_STACK
  32 #define DEPRECATED_PC_IN_CALL_DUMMY(pc, sp, frame_address) deprecated_pc_in_call_dummy_on_stack (pc, sp, frame_address)
  33 #define DEPRECATED_INIT_FRAME_PC(l,f) (init_frame_pc_default (l, f))
  34
  35 /* Forward declarations of some types we use in prototypes */
  36
  37 struct frame_info;
  38 struct frame_saved_regs;
  39 struct value;
  40 struct type;
  41 struct inferior_status;
  42
  43 /* By default assume we don't have to worry about software floating point.  */
  44 #ifndef SOFT_FLOAT
  45 #define SOFT_FLOAT 0
  46 #endif
  47
  48 /* Get at various relevent fields of an instruction word. */
  49
  50 #define MASK_5 0x1f
  51 #define MASK_11 0x7ff
  52 #define MASK_14 0x3fff
  53 #define MASK_21 0x1fffff
  54
  55 /* This macro gets bit fields using HP's numbering (MSB = 0) */
  56 #ifndef GET_FIELD
  57 #define GET_FIELD(X, FROM, TO) \
  58   ((X) >> (31 - (TO)) & ((1 << ((TO) - (FROM) + 1)) - 1))
  59 #endif
  60
  61 #if !GDB_MULTI_ARCH
  62 extern int hppa_reg_struct_has_addr (int gcc_p, struct type *type);
  63 #define REG_STRUCT_HAS_ADDR(gcc_p,type) hppa_reg_struct_has_addr (gcc_p,type)
  64 #endif
  65
  66 /* Offset from address of function to start of its code.
  67    Zero on most machines.  */
  68
  69 #if !GDB_MULTI_ARCH
  70 #define FUNCTION_START_OFFSET 0
  71 #endif
  72
  73 /* Advance PC across any function entry prologue instructions
  74    to reach some "real" code.  */
  75
  76 #if !GDB_MULTI_ARCH
  77 extern CORE_ADDR hppa_skip_prologue (CORE_ADDR);
  78 #define SKIP_PROLOGUE(pc) (hppa_skip_prologue (pc))
  79 #endif
  80
  81 /* If PC is in some function-call trampoline code, return the PC
  82    where the function itself actually starts.  If not, return NULL.  */
  83
  84 #if !GDB_MULTI_ARCH
  85 #define SKIP_TRAMPOLINE_CODE(pc) hppa_skip_trampoline_code (pc)
  86 extern CORE_ADDR hppa_skip_trampoline_code (CORE_ADDR);
  87 #endif
  88
  89 /* Return non-zero if we are in an appropriate trampoline. */
  90
  91 #if !GDB_MULTI_ARCH
  92 #define IN_SOLIB_CALL_TRAMPOLINE(pc, name) \
  93    hppa_in_solib_call_trampoline (pc, name)
  94 extern int hppa_in_solib_call_trampoline (CORE_ADDR, char *);
  95 #endif
  96
  97 #if !GDB_MULTI_ARCH
  98 #define IN_SOLIB_RETURN_TRAMPOLINE(pc, name) \
  99   hppa_in_solib_return_trampoline (pc, name)
 100 extern int hppa_in_solib_return_trampoline (CORE_ADDR, char *);
 101 #endif
 102
 103 #if !GDB_MULTI_ARCH
 104 #undef  SAVED_PC_AFTER_CALL
 105 #define SAVED_PC_AFTER_CALL(frame) hppa_saved_pc_after_call (frame)
 106 extern CORE_ADDR hppa_saved_pc_after_call (struct frame_info *);
 107 #endif
 108
 109 #if !GDB_MULTI_ARCH
 110 extern int hppa_inner_than (CORE_ADDR lhs, CORE_ADDR rhs);
 111 #define INNER_THAN(lhs,rhs) hppa_inner_than(lhs,rhs)
 112 #endif
 113
 114 #if !GDB_MULTI_ARCH
 115 extern CORE_ADDR hppa_stack_align (CORE_ADDR sp);
 116 #define STACK_ALIGN(sp) hppa_stack_align (sp)
 117 #endif
 118
 119 /* Sequence of bytes for breakpoint instruction.  */
 120
 121 #define BREAKPOINT {0x00, 0x01, 0x00, 0x04}
 122 #define BREAKPOINT32 0x10004
 123
 124 /* Amount PC must be decremented by after a breakpoint.
 125    This is often the number of bytes in BREAKPOINT
 126    but not always.
 127
 128    Not on the PA-RISC */
 129
 130 #if !GDB_MULTI_ARCH
 131 #define DECR_PC_AFTER_BREAK 0
 132 #endif
 133
 134 extern int hppa_pc_requires_run_before_use (CORE_ADDR pc);
 135 #define PC_REQUIRES_RUN_BEFORE_USE(pc) hppa_pc_requires_run_before_use (pc)
 136
 137 /* Say how long (ordinary) registers are.  This is a piece of bogosity
 138    used in push_word and a few other places; REGISTER_RAW_SIZE is the
 139    real way to know how big a register is.  */
 140
 141 #if !GDB_MULTI_ARCH
 142 #define REGISTER_SIZE 4
 143 #endif
 144
 145 /* Number of machine registers */
 146
 147 #if !GDB_MULTI_ARCH
 148 #define NUM_REGS 128
 149 #endif
 150
 151 /* Initializer for an array of names of registers.
 152    There should be NUM_REGS strings in this initializer.
 153    They are in rows of eight entries  */
 154
 155 #define REGISTER_NAMES  \
 156  {"flags",  "r1",      "rp",      "r3",    "r4",     "r5",      "r6",     "r7",    \
 157   "r8",     "r9",      "r10",     "r11",   "r12",    "r13",     "r14",    "r15",   \
 158   "r16",    "r17",     "r18",     "r19",   "r20",    "r21",     "r22",    "r23",   \
 159   "r24",    "r25",     "r26",     "dp",    "ret0",   "ret1",    "sp",     "r31",   \
 160   "sar",    "pcoqh",   "pcsqh",   "pcoqt", "pcsqt",  "eiem",    "iir",    "isr",   \
 161   "ior",    "ipsw",    "goto",    "sr4",   "sr0",    "sr1",     "sr2",    "sr3",   \
 162   "sr5",    "sr6",     "sr7",     "cr0",   "cr8",    "cr9",     "ccr",    "cr12",  \
 163   "cr13",   "cr24",    "cr25",    "cr26",  "mpsfu_high","mpsfu_low","mpsfu_ovflo","pad",\
 164   "fpsr",    "fpe1",   "fpe2",    "fpe3",  "fpe4",   "fpe5",    "fpe6",   "fpe7",  \
 165   "fr4",     "fr4R",   "fr5",     "fr5R",  "fr6",    "fr6R",    "fr7",    "fr7R",  \
 166   "fr8",     "fr8R",   "fr9",     "fr9R",  "fr10",   "fr10R",   "fr11",   "fr11R", \
 167   "fr12",    "fr12R",  "fr13",    "fr13R", "fr14",   "fr14R",   "fr15",   "fr15R", \
 168   "fr16",    "fr16R",  "fr17",    "fr17R", "fr18",   "fr18R",   "fr19",   "fr19R", \
 169   "fr20",    "fr20R",  "fr21",    "fr21R", "fr22",   "fr22R",   "fr23",   "fr23R", \
 170   "fr24",    "fr24R",  "fr25",    "fr25R", "fr26",   "fr26R",   "fr27",   "fr27R", \
 171   "fr28",    "fr28R",  "fr29",    "fr29R", "fr30",   "fr30R",   "fr31",   "fr31R"}
 172
 173 /* Register numbers of various important registers.
 174    Note that some of these values are "real" register numbers,
 175    and correspond to the general registers of the machine,
 176    and some are "phony" register numbers which are too large
 177    to be actual register numbers as far as the user is concerned
 178    but do serve to get the desired values when passed to read_register.  */
 179
 180 #define R0_REGNUM 0             /* Doesn't actually exist, used as base for
 181                                    other r registers.  */
 182 #define FLAGS_REGNUM 0          /* Various status flags */
 183 #define RP_REGNUM 2             /* return pointer */
 184 #if !GDB_MULTI_ARCH
 185 #define FP_REGNUM 3             /* Contains address of executing stack */
 186                                 /* frame */
 187 #endif
 188 #if !GDB_MULTI_ARCH
 189 #define SP_REGNUM 30            /* Contains address of top of stack */
 190 #endif
 191 #define SAR_REGNUM 32           /* Shift Amount Register */
 192 #define IPSW_REGNUM 41          /* Interrupt Processor Status Word */
 193 #define PCOQ_HEAD_REGNUM 33     /* instruction offset queue head */
 194 #define PCSQ_HEAD_REGNUM 34     /* instruction space queue head */
 195 #define PCOQ_TAIL_REGNUM 35     /* instruction offset queue tail */
 196 #define PCSQ_TAIL_REGNUM 36     /* instruction space queue tail */
 197 #define EIEM_REGNUM 37          /* External Interrupt Enable Mask */
 198 #define IIR_REGNUM 38           /* Interrupt Instruction Register */
 199 #define IOR_REGNUM 40           /* Interrupt Offset Register */
 200 #define SR4_REGNUM 43           /* space register 4 */
 201 #define RCR_REGNUM 51           /* Recover Counter (also known as cr0) */
 202 #define CCR_REGNUM 54           /* Coprocessor Configuration Register */
 203 #define TR0_REGNUM 57           /* Temporary Registers (cr24 -> cr31) */
 204 #define CR27_REGNUM 60          /* Base register for thread-local storage, cr27 */
 205 #if !GDB_MULTI_ARCH
 206 #define FP0_REGNUM 64           /* floating point reg. 0 (fspr) */
 207 #endif
 208 #define FP4_REGNUM 72
 209
 210 #define ARG0_REGNUM 26          /* The first argument of a callee. */
 211 #define ARG1_REGNUM 25          /* The second argument of a callee. */
 212 #define ARG2_REGNUM 24          /* The third argument of a callee. */
 213 #define ARG3_REGNUM 23          /* The fourth argument of a callee. */
 214
 215 /* compatibility with the rest of gdb. */
 216 #if !GDB_MULTI_ARCH
 217 #define PC_REGNUM PCOQ_HEAD_REGNUM
 218 #endif
 219 #if !GDB_MULTI_ARCH
 220 #define NPC_REGNUM PCOQ_TAIL_REGNUM
 221 #endif
 222
 223 /*
 224  * Processor Status Word Masks
 225  */
 226
 227 #define PSW_T   0x01000000      /* Taken Branch Trap Enable */
 228 #define PSW_H   0x00800000      /* Higher-Privilege Transfer Trap Enable */
 229 #define PSW_L   0x00400000      /* Lower-Privilege Transfer Trap Enable */
 230 #define PSW_N   0x00200000      /* PC Queue Front Instruction Nullified */
 231 #define PSW_X   0x00100000      /* Data Memory Break Disable */
 232 #define PSW_B   0x00080000      /* Taken Branch in Previous Cycle */
 233 #define PSW_C   0x00040000      /* Code Address Translation Enable */
 234 #define PSW_V   0x00020000      /* Divide Step Correction */
 235 #define PSW_M   0x00010000      /* High-Priority Machine Check Disable */
 236 #define PSW_CB  0x0000ff00      /* Carry/Borrow Bits */
 237 #define PSW_R   0x00000010      /* Recovery Counter Enable */
 238 #define PSW_Q   0x00000008      /* Interruption State Collection Enable */
 239 #define PSW_P   0x00000004      /* Protection ID Validation Enable */
 240 #define PSW_D   0x00000002      /* Data Address Translation Enable */
 241 #define PSW_I   0x00000001      /* External, Power Failure, Low-Priority */
 242                                 /* Machine Check Interruption Enable */
 243
 244 /* When fetching register values from an inferior or a core file,
 245    clean them up using this macro.  BUF is a char pointer to
 246    the raw value of the register in the registers[] array.  */
 247
 248 #define DEPRECATED_CLEAN_UP_REGISTER_VALUE(regno, buf) \
 249   do {  \
 250     if ((regno) == PCOQ_HEAD_REGNUM || (regno) == PCOQ_TAIL_REGNUM) \
 251       (buf)[sizeof(CORE_ADDR) -1] &= ~0x3; \
 252   } while (0)
 253
 254 /* Define DEPRECATED_DO_REGISTERS_INFO() to do machine-specific
 255    formatting of register dumps. */
 256
 257 #define DEPRECATED_DO_REGISTERS_INFO(_regnum, fp) pa_do_registers_info (_regnum, fp)
 258 extern void pa_do_registers_info (int, int);
 259
 260 #if 0
 261 #define STRCAT_REGISTER(regnum, fpregs, stream, precision) pa_do_strcat_registers_info (regnum, fpregs, stream, precision)
 262 extern void pa_do_strcat_registers_info (int, int, struct ui_file *, enum precision_type);
 263 #endif
 264
 265 /* PA specific macro to see if the current instruction is nullified. */
 266 #ifndef INSTRUCTION_NULLIFIED
 267 extern int hppa_instruction_nullified (void);
 268 #define INSTRUCTION_NULLIFIED hppa_instruction_nullified ()
 269 #endif
 270
 271 /* Number of bytes of storage in the actual machine representation
 272    for register N.  On the PA-RISC, all regs are 4 bytes, including
 273    the FP registers (they're accessed as two 4 byte halves).  */
 274
 275 #if !GDB_MULTI_ARCH
 276 extern int hppa_register_raw_size (int reg_nr);
 277 #define REGISTER_RAW_SIZE(N) hppa_register_raw_size (N)
 278 #endif
 279
 280 /* Total amount of space needed to store our copies of the machine's
 281    register state, the array `registers'.  */
 282 #if !GDB_MULTI_ARCH
 283 #define REGISTER_BYTES (NUM_REGS * 4)
 284 #endif
 285
 286 #if !GDB_MULTI_ARCH
 287 extern int hppa_register_byte (int reg_nr);
 288 #define REGISTER_BYTE(N) hppa_register_byte (N)
 289 #endif
 290
 291 /* Number of bytes of storage in the program's representation
 292    for register N. */
 293
 294 #if !GDB_MULTI_ARCH
 295 #define REGISTER_VIRTUAL_SIZE(N) REGISTER_RAW_SIZE(N)
 296 #endif
 297
 298 /* Largest value REGISTER_RAW_SIZE can have.  */
 299
 300 #if !GDB_MULTI_ARCH
 301 #define DEPRECATED_MAX_REGISTER_RAW_SIZE 4
 302 #endif
 303
 304 /* Largest value REGISTER_VIRTUAL_SIZE can have.  */
 305
 306 #if !GDB_MULTI_ARCH
 307 #define DEPRECATED_MAX_REGISTER_VIRTUAL_SIZE 8
 308 #endif
 309
 310 #if !GDB_MULTI_ARCH
 311 extern struct type * hppa_register_virtual_type (int reg_nr);
 312 #define REGISTER_VIRTUAL_TYPE(N) hppa_register_virtual_type (N)
 313 #endif
 314
 315 #if !GDB_MULTI_ARCH
 316 extern void hppa_store_struct_return (CORE_ADDR addr, CORE_ADDR sp);
 317 #define STORE_STRUCT_RETURN(ADDR, SP) hppa_store_struct_return (ADDR, SP)
 318 #endif
 319
 320 /* Extract from an array REGBUF containing the (raw) register state
 321    a function return value of type TYPE, and copy that, in virtual format,
 322    into VALBUF.  */
 323
 324 #if !GDB_MULTI_ARCH
 325 void hppa_extract_return_value (struct type *type, char *regbuf, char *valbuf);
 326 #define DEPRECATED_EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \
 327   hppa_extract_return_value (TYPE, REGBUF, VALBUF);
 328 #endif
 329
 330  /* elz: decide whether the function returning a value of type type
 331     will put it on the stack or in the registers.
 332     The pa calling convention says that:
 333     register 28 (called ret0 by gdb) contains any ASCII char,
 334     and any non_floating point value up to 32-bits.
 335     reg 28 and 29 contain non-floating point up tp 64 bits and larger
 336     than 32 bits. (higer order word in reg 28).
 337     fr4: floating point up to 64 bits
 338     sr1: space identifier (32-bit)
 339     stack: any lager than 64-bit, with the address in r28
 340   */
 341 #if !GDB_MULTI_ARCH
 342 extern use_struct_convention_fn hppa_use_struct_convention;
 343 #define USE_STRUCT_CONVENTION(gcc_p,type) hppa_use_struct_convention (gcc_p,type)
 344 #endif
 345
 346 /* Write into appropriate registers a function return value
 347    of type TYPE, given in virtual format.  */
 348
 349 #if !GDB_MULTI_ARCH
 350 extern void hppa_store_return_value (struct type *type, char *valbuf);
 351 #define DEPRECATED_STORE_RETURN_VALUE(TYPE,VALBUF) \
 352   hppa_store_return_value (TYPE, VALBUF);
 353 #endif
 354
 355 #if !GDB_MULTI_ARCH
 356 extern CORE_ADDR hppa_extract_struct_value_address (char *regbuf);
 357 #define DEPRECATED_EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) \
 358   hppa_extract_struct_value_address (REGBUF)
 359 #endif
 360
 361 /* elz: Return a large value, which is stored on the stack at addr.
 362    This is defined only for the hppa, at this moment.  The above macro
 363    DEPRECATED_EXTRACT_STRUCT_VALUE_ADDRESS is not called anymore,
 364    because it assumes that on exit from a called function which
 365    returns a large structure on the stack, the address of the ret
 366    structure is still in register 28. Unfortunately this register is
 367    usually overwritten by the called function itself, on hppa. This is
 368    specified in the calling convention doc. As far as I know, the only
 369    way to get the return value is to have the caller tell us where it
 370    told the callee to put it, rather than have the callee tell us.  */
 371 struct value *hppa_value_returned_from_stack (register struct type *valtype,
 372                                               CORE_ADDR addr);
 373 #define VALUE_RETURNED_FROM_STACK(valtype,addr) \
 374   hppa_value_returned_from_stack (valtype, addr)
 375
 376 #if !GDB_MULTI_ARCH
 377 extern int hppa_cannot_store_register (int regnum);
 378 #define CANNOT_STORE_REGISTER(regno) hppa_cannot_store_register (regno)
 379 #endif
 380
 381 #if !GDB_MULTI_ARCH
 382 #define DEPRECATED_INIT_EXTRA_FRAME_INFO(fromleaf, frame) hppa_init_extra_frame_info (fromleaf, frame)
 383 extern void hppa_init_extra_frame_info (int, struct frame_info *);
 384 #endif
 385
 386 /* Describe the pointer in each stack frame to the previous stack frame
 387    (its caller).  */
 388
 389 /* DEPRECATED_FRAME_CHAIN takes a frame's nominal address and produces
 390    the frame's chain-pointer.  */
 391
 392 /* In the case of the PA-RISC, the frame's nominal address
 393    is the address of a 4-byte word containing the calling frame's
 394    address (previous FP).  */
 395
 396 #if !GDB_MULTI_ARCH
 397 #define DEPRECATED_FRAME_CHAIN(thisframe) hppa_frame_chain (thisframe)
 398 extern CORE_ADDR hppa_frame_chain (struct frame_info *);
 399 #endif
 400
 401 #if !GDB_MULTI_ARCH
 402 extern int hppa_frame_chain_valid (CORE_ADDR, struct frame_info *);
 403 #define DEPRECATED_FRAME_CHAIN_VALID(chain, thisframe) hppa_frame_chain_valid (chain, thisframe)
 404 #endif
 405
 406 /* Define other aspects of the stack frame.  */
 407
 408 /* A macro that tells us whether the function invocation represented
 409    by FI does not have a frame on the stack associated with it.  If it
 410    does not, FRAMELESS is set to 1, else 0.  */
 411 #if !GDB_MULTI_ARCH
 412 #define FRAMELESS_FUNCTION_INVOCATION(FI) \
 413   (hppa_frameless_function_invocation (FI))
 414 extern int hppa_frameless_function_invocation (struct frame_info *);
 415 #endif
 416
 417 #if !GDB_MULTI_ARCH
 418 extern CORE_ADDR hppa_frame_saved_pc (struct frame_info *frame);
 419 #define DEPRECATED_FRAME_SAVED_PC(FRAME) hppa_frame_saved_pc (FRAME)
 420 #endif
 421
 422 #if !GDB_MULTI_ARCH
 423 extern CORE_ADDR hppa_frame_args_address (struct frame_info *fi);
 424 #define FRAME_ARGS_ADDRESS(fi) hppa_frame_args_address (fi)
 425 #endif
 426
 427 #if !GDB_MULTI_ARCH
 428 extern CORE_ADDR hppa_frame_locals_address (struct frame_info *fi);
 429 #define FRAME_LOCALS_ADDRESS(fi) hppa_frame_locals_address (fi)
 430 #endif
 431
 432 #if !GDB_MULTI_ARCH
 433 extern int hppa_frame_num_args (struct frame_info *frame);
 434 #define FRAME_NUM_ARGS(fi) hppa_frame_num_args (fi)
 435 #endif
 436
 437 #if !GDB_MULTI_ARCH
 438 #define FRAME_ARGS_SKIP 0
 439 #endif
 440
 441 #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \
 442   hppa_frame_find_saved_regs (frame_info, &frame_saved_regs)
 443 extern void hppa_frame_find_saved_regs (struct frame_info *,
 444                                         struct frame_saved_regs *);
 445 \f
 446
 447 /* Things needed for making the inferior call functions.  */
 448
 449 #if !GDB_MULTI_ARCH
 450 #define DEPRECATED_PUSH_DUMMY_FRAME hppa_push_dummy_frame ()
 451 extern void hppa_push_dummy_frame (void);
 452 #endif
 453
 454 /* Discard from the stack the innermost frame,
 455    restoring all saved registers.  */
 456 #if !GDB_MULTI_ARCH
 457 #define DEPRECATED_POP_FRAME  hppa_pop_frame ()
 458 extern void hppa_pop_frame (void);
 459 #endif
 460
 461 #define INSTRUCTION_SIZE 4
 462
 463 #ifndef PA_LEVEL_0
 464
 465 /* Non-level zero PA's have space registers (but they don't always have
 466    floating-point, do they????  */
 467
 468 /* This sequence of words is the instructions
 469
 470    ; Call stack frame has already been built by gdb. Since we could be calling
 471    ; a varargs function, and we do not have the benefit of a stub to put things in
 472    ; the right place, we load the first 4 word of arguments into both the general
 473    ; and fp registers.
 474    call_dummy
 475    ldw -36(sp), arg0
 476    ldw -40(sp), arg1
 477    ldw -44(sp), arg2
 478    ldw -48(sp), arg3
 479    ldo -36(sp), r1
 480    fldws 0(0, r1), fr4
 481    fldds -4(0, r1), fr5
 482    fldws -8(0, r1), fr6
 483    fldds -12(0, r1), fr7
 484    ldil 0, r22                  ; FUNC_LDIL_OFFSET must point here
 485    ldo 0(r22), r22                      ; FUNC_LDO_OFFSET must point here
 486    ldsid (0,r22), r4
 487    ldil 0, r1                   ; SR4EXPORT_LDIL_OFFSET must point here
 488    ldo 0(r1), r1                        ; SR4EXPORT_LDO_OFFSET must point here
 489    ldsid (0,r1), r20
 490    combt,=,n r4, r20, text_space        ; If target is in data space, do a
 491    ble 0(sr5, r22)                      ; "normal" procedure call
 492    copy r31, r2
 493    break 4, 8
 494    mtsp r21, sr0
 495    ble,n 0(sr0, r22)
 496    text_space                           ; Otherwise, go through _sr4export,
 497    ble (sr4, r1)                        ; which will return back here.
 498    stw r31,-24(r30)
 499    break 4, 8
 500    mtsp r21, sr0
 501    ble,n 0(sr0, r22)
 502    nop                          ; To avoid kernel bugs
 503    nop                          ; and keep the dummy 8 byte aligned
 504
 505    The dummy decides if the target is in text space or data space. If
 506    it's in data space, there's no problem because the target can
 507    return back to the dummy. However, if the target is in text space,
 508    the dummy calls the secret, undocumented routine _sr4export, which
 509    calls a function in text space and can return to any space. Instead
 510    of including fake instructions to represent saved registers, we
 511    know that the frame is associated with the call dummy and treat it
 512    specially.
 513
 514    The trailing NOPs are needed to avoid a bug in HPUX, BSD and OSF1
 515    kernels.   If the memory at the location pointed to by the PC is
 516    0xffffffff then a ptrace step call will fail (even if the instruction
 517    is nullified).
 518
 519    The code to pop a dummy frame single steps three instructions
 520    starting with the last mtsp.  This includes the nullified "instruction"
 521    following the ble (which is uninitialized junk).  If the
 522    "instruction" following the last BLE is 0xffffffff, then the ptrace
 523    will fail and the dummy frame is not correctly popped.
 524
 525    By placing a NOP in the delay slot of the BLE instruction we can be
 526    sure that we never try to execute a 0xffffffff instruction and
 527    avoid the kernel bug.  The second NOP is needed to keep the call
 528    dummy 8 byte aligned.  */
 529
 530 /* Define offsets into the call dummy for the target function address */
 531 #define FUNC_LDIL_OFFSET (INSTRUCTION_SIZE * 9)
 532 #define FUNC_LDO_OFFSET (INSTRUCTION_SIZE * 10)
 533
 534 /* Define offsets into the call dummy for the _sr4export address */
 535 #define SR4EXPORT_LDIL_OFFSET (INSTRUCTION_SIZE * 12)
 536 #define SR4EXPORT_LDO_OFFSET (INSTRUCTION_SIZE * 13)
 537
 538 #define CALL_DUMMY {0x4BDA3FB9, 0x4BD93FB1, 0x4BD83FA9, 0x4BD73FA1,\
 539                     0x37C13FB9, 0x24201004, 0x2C391005, 0x24311006,\
 540                     0x2C291007, 0x22C00000, 0x36D60000, 0x02C010A4,\
 541                     0x20200000, 0x34210000, 0x002010b4, 0x82842022,\
 542                     0xe6c06000, 0x081f0242, 0x00010004, 0x00151820,\
 543                     0xe6c00002, 0xe4202000, 0x6bdf3fd1, 0x00010004,\
 544                     0x00151820, 0xe6c00002, 0x08000240, 0x08000240}
 545
 546 #if !GDB_MULTI_ARCH
 547 #define CALL_DUMMY_LENGTH (INSTRUCTION_SIZE * 28)
 548 #endif
 549 #define REG_PARM_STACK_SPACE 16
 550
 551 #else /* defined PA_LEVEL_0 */
 552
 553 /* FIXME: brobecker 2002-12-26.  PA_LEVEL_0 is only defined for the
 554    hppa-pro target, which should be obsoleted soon.  The following
 555    section will therefore not be included in the multiarch conversion.  */
 556 /* This is the call dummy for a level 0 PA.  Level 0's don't have space
 557    registers (or floating point?), so we skip all that inter-space call stuff,
 558    and avoid touching the fp regs.
 559
 560    call_dummy
 561
 562    ldw -36(%sp), %arg0
 563    ldw -40(%sp), %arg1
 564    ldw -44(%sp), %arg2
 565    ldw -48(%sp), %arg3
 566    ldil 0, %r31                 ; FUNC_LDIL_OFFSET must point here
 567    ldo 0(%r31), %r31            ; FUNC_LDO_OFFSET must point here
 568    ble 0(%sr0, %r31)
 569    copy %r31, %r2
 570    break 4, 8
 571    nop                          ; restore_pc_queue expects these
 572    bv,n 0(%r22)                 ; instructions to be here...
 573    nop
 574  */
 575
 576 /* Define offsets into the call dummy for the target function address */
 577 #define FUNC_LDIL_OFFSET (INSTRUCTION_SIZE * 4)
 578 #define FUNC_LDO_OFFSET (INSTRUCTION_SIZE * 5)
 579
 580 #define CALL_DUMMY {0x4bda3fb9, 0x4bd93fb1, 0x4bd83fa9, 0x4bd73fa1,\
 581                     0x23e00000, 0x37ff0000, 0xe7e00000, 0x081f0242,\
 582                     0x00010004, 0x08000240, 0xeac0c002, 0x08000240}
 583
 584 #define CALL_DUMMY_LENGTH (INSTRUCTION_SIZE * 12)
 585
 586 #endif /* defined PA_LEVEL_0 */
 587
 588 #if !GDB_MULTI_ARCH
 589 #define CALL_DUMMY_START_OFFSET 0
 590 #endif
 591
 592 /* If we've reached a trap instruction within the call dummy, then
 593    we'll consider that to mean that we've reached the call dummy's
 594    end after its successful completion. */
 595 #define CALL_DUMMY_HAS_COMPLETED(pc, sp, frame_address) \
 596   (DEPRECATED_PC_IN_CALL_DUMMY((pc), (sp), (frame_address)) && \
 597    (read_memory_integer((pc), 4) == BREAKPOINT32))
 598
 599 /*
 600  * Insert the specified number of args and function address
 601  * into a call sequence of the above form stored at DUMMYNAME.
 602  *
 603  * On the hppa we need to call the stack dummy through $$dyncall.
 604  * Therefore our version of FIX_CALL_DUMMY takes an extra argument,
 605  * real_pc, which is the location where gdb should start up the
 606  * inferior to do the function call.
 607  */
 608
 609 /* FIXME: brobecker 2002-12-26.  This macro is going to cause us some
 610    problems before we can go to multiarch partial as it has been diverted
 611    on HPUX to return the value of the PC!  */
 612 #define FIX_CALL_DUMMY hppa_fix_call_dummy
 613 extern CORE_ADDR hppa_fix_call_dummy (char *, CORE_ADDR, CORE_ADDR, int,
 614                                       struct value **, struct type *, int);
 615
 616 #if !GDB_MULTI_ARCH
 617 #define DEPRECATED_PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr) \
 618   (hppa_push_arguments((nargs), (args), (sp), (struct_return), (struct_addr)))
 619 extern CORE_ADDR hppa_push_arguments (int, struct value **, CORE_ADDR, int,
 620                                       CORE_ADDR);
 621 #endif
 622
 623 \f
 624 #if !GDB_MULTI_ARCH
 625 extern CORE_ADDR hppa_smash_text_address (CORE_ADDR addr);
 626 #define SMASH_TEXT_ADDRESS(addr) hppa_smash_text_address (addr)
 627 #endif
 628
 629 #define GDB_TARGET_IS_HPPA
 630
 631 #if !GDB_MULTI_ARCH
 632 #define BELIEVE_PCC_PROMOTION 1
 633 #endif
 634
 635 /*
 636  * Unwind table and descriptor.
 637  */
 638
 639 struct unwind_table_entry
 640   {
 641     CORE_ADDR region_start;
 642     CORE_ADDR region_end;
 643
 644     unsigned int Cannot_unwind:1;       /* 0 */
 645     unsigned int Millicode:1;   /* 1 */
 646     unsigned int Millicode_save_sr0:1;  /* 2 */
 647     unsigned int Region_description:2;  /* 3..4 */
 648     unsigned int reserved1:1;   /* 5 */
 649     unsigned int Entry_SR:1;    /* 6 */
 650     unsigned int Entry_FR:4;    /* number saved *//* 7..10 */
 651     unsigned int Entry_GR:5;    /* number saved *//* 11..15 */
 652     unsigned int Args_stored:1; /* 16 */
 653     unsigned int Variable_Frame:1;      /* 17 */
 654     unsigned int Separate_Package_Body:1;       /* 18 */
 655     unsigned int Frame_Extension_Millicode:1;   /* 19 */
 656     unsigned int Stack_Overflow_Check:1;        /* 20 */
 657     unsigned int Two_Instruction_SP_Increment:1;        /* 21 */
 658     unsigned int Ada_Region:1;  /* 22 */
 659     unsigned int cxx_info:1;    /* 23 */
 660     unsigned int cxx_try_catch:1;       /* 24 */
 661     unsigned int sched_entry_seq:1;     /* 25 */
 662     unsigned int reserved2:1;   /* 26 */
 663     unsigned int Save_SP:1;     /* 27 */
 664     unsigned int Save_RP:1;     /* 28 */
 665     unsigned int Save_MRP_in_frame:1;   /* 29 */
 666     unsigned int extn_ptr_defined:1;    /* 30 */
 667     unsigned int Cleanup_defined:1;     /* 31 */
 668
 669     unsigned int MPE_XL_interrupt_marker:1;     /* 0 */
 670     unsigned int HP_UX_interrupt_marker:1;      /* 1 */
 671     unsigned int Large_frame:1; /* 2 */
 672     unsigned int Pseudo_SP_Set:1;       /* 3 */
 673     unsigned int reserved4:1;   /* 4 */
 674     unsigned int Total_frame_size:27;   /* 5..31 */
 675
 676     /* This is *NOT* part of an actual unwind_descriptor in an object
 677        file.  It is *ONLY* part of the "internalized" descriptors that
 678        we create from those in a file.
 679      */
 680     struct
 681       {
 682         unsigned int stub_type:4;       /* 0..3 */
 683         unsigned int padding:28;        /* 4..31 */
 684       }
 685     stub_unwind;
 686   };
 687
 688 /* HP linkers also generate unwinds for various linker-generated stubs.
 689    GDB reads in the stubs from the $UNWIND_END$ subspace, then
 690    "converts" them into normal unwind entries using some of the reserved
 691    fields to store the stub type.  */
 692
 693 struct stub_unwind_entry
 694   {
 695     /* The offset within the executable for the associated stub.  */
 696     unsigned stub_offset;
 697
 698     /* The type of stub this unwind entry describes.  */
 699     char type;
 700
 701     /* Unknown.  Not needed by GDB at this time.  */
 702     char prs_info;
 703
 704     /* Length (in instructions) of the associated stub.  */
 705     short stub_length;
 706   };
 707
 708 /* Sizes (in bytes) of the native unwind entries.  */
 709 #define UNWIND_ENTRY_SIZE 16
 710 #define STUB_UNWIND_ENTRY_SIZE 8
 711
 712 /* The gaps represent linker stubs used in MPE and space for future
 713    expansion.  */
 714 enum unwind_stub_types
 715   {
 716     LONG_BRANCH = 1,
 717     PARAMETER_RELOCATION = 2,
 718     EXPORT = 10,
 719     IMPORT = 11,
 720     IMPORT_SHLIB = 12,
 721   };
 722
 723 /* We use the objfile->obj_private pointer for two things:
 724
 725  * 1.  An unwind table;
 726  *
 727  * 2.  A pointer to any associated shared library object.
 728  *
 729  * #defines are used to help refer to these objects.
 730  */
 731
 732 /* Info about the unwind table associated with an object file.
 733
 734  * This is hung off of the "objfile->obj_private" pointer, and
 735  * is allocated in the objfile's psymbol obstack.  This allows
 736  * us to have unique unwind info for each executable and shared
 737  * library that we are debugging.
 738  */
 739 struct obj_unwind_info
 740   {
 741     struct unwind_table_entry *table;   /* Pointer to unwind info */
 742     struct unwind_table_entry *cache;   /* Pointer to last entry we found */
 743     int last;                   /* Index of last entry */
 744   };
 745
 746 typedef struct obj_private_struct
 747   {
 748     struct obj_unwind_info *unwind_info;        /* a pointer */
 749     struct so_list *so_info;    /* a pointer  */
 750     CORE_ADDR dp;
 751   }
 752 obj_private_data_t;
 753
 754 #if 0
 755 extern void target_write_pc (CORE_ADDR, int);
 756 extern CORE_ADDR target_read_pc (int);
 757 extern CORE_ADDR skip_trampoline_code (CORE_ADDR, char *);
 758 #endif
 759
 760 #if !GDB_MULTI_ARCH
 761 #define TARGET_READ_PC(pid) hppa_target_read_pc (pid)
 762 extern CORE_ADDR hppa_target_read_pc (ptid_t);
 763 #endif
 764
 765 #if !GDB_MULTI_ARCH
 766 #define TARGET_WRITE_PC(v,pid) hppa_target_write_pc (v,pid)
 767 extern void hppa_target_write_pc (CORE_ADDR, ptid_t);
 768 #endif
 769
 770 #if !GDB_MULTI_ARCH
 771 #define TARGET_READ_FP() hppa_target_read_fp ()
 772 extern CORE_ADDR hppa_target_read_fp (void);
 773 #endif
 774
 775 /* For a number of horrible reasons we may have to adjust the location
 776    of variables on the stack.  Ugh.  */
 777 #define HPREAD_ADJUST_STACK_ADDRESS(ADDR) hpread_adjust_stack_address(ADDR)
 778 extern int hpread_adjust_stack_address (CORE_ADDR);
 779
 780 /* Here's how to step off a permanent breakpoint.  */
 781 #define SKIP_PERMANENT_BREAKPOINT (hppa_skip_permanent_breakpoint)
 782 extern void hppa_skip_permanent_breakpoint (void);
 783
 784 /* On HP-UX, certain system routines (millicode) have names beginning
 785    with $ or $$, e.g. $$dyncall, which handles inter-space procedure
 786    calls on PA-RISC.  Tell the expression parser to check for those
 787    when parsing tokens that begin with "$".  */
 788 #define SYMBOLS_CAN_START_WITH_DOLLAR (1)