gdb/hppa-tdep.c

   1 /* Machine-dependent code which would otherwise be in inflow.c and core.c,
   2    for GDB, the GNU debugger.  This code is for the HP PA-RISC cpu.
   3    Copyright 1986, 1987, 1989, 1990, 1991, 1992, 1993 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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  23
  24 #include "defs.h"
  25 #include "frame.h"
  26 #include "inferior.h"
  27 #include "value.h"
  28
  29 /* For argument passing to the inferior */
  30 #include "symtab.h"
  31
  32 #ifdef USG
  33 #include <sys/types.h>
  34 #endif
  35
  36 #include <sys/param.h>
  37 #include <sys/dir.h>
  38 #include <signal.h>
  39 #include <sys/ioctl.h>
  40
  41 #ifdef COFF_ENCAPSULATE
  42 #include "a.out.encap.h"
  43 #else
  44 #include <a.out.h>
  45 #endif
  46 #ifndef N_SET_MAGIC
  47 #define N_SET_MAGIC(exec, val) ((exec).a_magic = (val))
  48 #endif
  49
  50 /*#include <sys/user.h>         After a.out.h  */
  51 #include <sys/file.h>
  52 #include <sys/stat.h>
  53 #include <machine/psl.h>
  54 #include "wait.h"
  55
  56 #include "gdbcore.h"
  57 #include "gdbcmd.h"
  58 #include "target.h"
  59 #include "symfile.h"
  60 #include "objfiles.h"
  61
  62 static int restore_pc_queue PARAMS ((struct frame_saved_regs *fsr));
  63 static int hppa_alignof PARAMS ((struct type *arg));
  64 CORE_ADDR frame_saved_pc PARAMS ((FRAME frame));
  65
  66 \f
  67 /* Routines to extract various sized constants out of hppa
  68    instructions. */
  69
  70 /* This assumes that no garbage lies outside of the lower bits of
  71    value. */
  72
  73 int
  74 sign_extend (val, bits)
  75      unsigned val, bits;
  76 {
  77   return (int)(val >> bits - 1 ? (-1 << bits) | val : val);
  78 }
  79
  80 /* For many immediate values the sign bit is the low bit! */
  81
  82 int
  83 low_sign_extend (val, bits)
  84      unsigned val, bits;
  85 {
  86   return (int)((val & 0x1 ? (-1 << (bits - 1)) : 0) | val >> 1);
  87 }
  88 /* extract the immediate field from a ld{bhw}s instruction */
  89
  90 unsigned
  91 get_field (val, from, to)
  92      unsigned val, from, to;
  93 {
  94   val = val >> 31 - to;
  95   return val & ((1 << 32 - from) - 1);
  96 }
  97
  98 unsigned
  99 set_field (val, from, to, new_val)
 100      unsigned *val, from, to;
 101 {
 102   unsigned mask = ~((1 << (to - from + 1)) << (31 - from));
 103   return *val = *val & mask | (new_val << (31 - from));
 104 }
 105
 106 /* extract a 3-bit space register number from a be, ble, mtsp or mfsp */
 107
 108 extract_3 (word)
 109      unsigned word;
 110 {
 111   return GET_FIELD (word, 18, 18) << 2 | GET_FIELD (word, 16, 17);
 112 }
 113
 114 extract_5_load (word)
 115      unsigned word;
 116 {
 117   return low_sign_extend (word >> 16 & MASK_5, 5);
 118 }
 119
 120 /* extract the immediate field from a st{bhw}s instruction */
 121
 122 int
 123 extract_5_store (word)
 124      unsigned word;
 125 {
 126   return low_sign_extend (word & MASK_5, 5);
 127 }
 128
 129 /* extract the immediate field from a break instruction */
 130
 131 unsigned
 132 extract_5r_store (word)
 133      unsigned word;
 134 {
 135   return (word & MASK_5);
 136 }
 137
 138 /* extract the immediate field from a {sr}sm instruction */
 139
 140 unsigned
 141 extract_5R_store (word)
 142      unsigned word;
 143 {
 144   return (word >> 16 & MASK_5);
 145 }
 146
 147 /* extract an 11 bit immediate field */
 148
 149 int
 150 extract_11 (word)
 151      unsigned word;
 152 {
 153   return low_sign_extend (word & MASK_11, 11);
 154 }
 155
 156 /* extract a 14 bit immediate field */
 157
 158 int
 159 extract_14 (word)
 160      unsigned word;
 161 {
 162   return low_sign_extend (word & MASK_14, 14);
 163 }
 164
 165 /* deposit a 14 bit constant in a word */
 166
 167 unsigned
 168 deposit_14 (opnd, word)
 169      int opnd;
 170      unsigned word;
 171 {
 172   unsigned sign = (opnd < 0 ? 1 : 0);
 173
 174   return word | ((unsigned)opnd << 1 & MASK_14)  | sign;
 175 }
 176
 177 /* extract a 21 bit constant */
 178
 179 int
 180 extract_21 (word)
 181      unsigned word;
 182 {
 183   int val;
 184
 185   word &= MASK_21;
 186   word <<= 11;
 187   val = GET_FIELD (word, 20, 20);
 188   val <<= 11;
 189   val |= GET_FIELD (word, 9, 19);
 190   val <<= 2;
 191   val |= GET_FIELD (word, 5, 6);
 192   val <<= 5;
 193   val |= GET_FIELD (word, 0, 4);
 194   val <<= 2;
 195   val |= GET_FIELD (word, 7, 8);
 196   return sign_extend (val, 21) << 11;
 197 }
 198
 199 /* deposit a 21 bit constant in a word. Although 21 bit constants are
 200    usually the top 21 bits of a 32 bit constant, we assume that only
 201    the low 21 bits of opnd are relevant */
 202
 203 unsigned
 204 deposit_21 (opnd, word)
 205      unsigned opnd, word;
 206 {
 207   unsigned val = 0;
 208
 209   val |= GET_FIELD (opnd, 11 + 14, 11 + 18);
 210   val <<= 2;
 211   val |= GET_FIELD (opnd, 11 + 12, 11 + 13);
 212   val <<= 2;
 213   val |= GET_FIELD (opnd, 11 + 19, 11 + 20);
 214   val <<= 11;
 215   val |= GET_FIELD (opnd, 11 + 1, 11 + 11);
 216   val <<= 1;
 217   val |= GET_FIELD (opnd, 11 + 0, 11 + 0);
 218   return word | val;
 219 }
 220
 221 /* extract a 12 bit constant from branch instructions */
 222
 223 int
 224 extract_12 (word)
 225      unsigned word;
 226 {
 227   return sign_extend (GET_FIELD (word, 19, 28) |
 228                       GET_FIELD (word, 29, 29) << 10 |
 229                       (word & 0x1) << 11, 12) << 2;
 230 }
 231
 232 /* extract a 17 bit constant from branch instructions, returning the
 233    19 bit signed value. */
 234
 235 int
 236 extract_17 (word)
 237      unsigned word;
 238 {
 239   return sign_extend (GET_FIELD (word, 19, 28) |
 240                       GET_FIELD (word, 29, 29) << 10 |
 241                       GET_FIELD (word, 11, 15) << 11 |
 242                       (word & 0x1) << 16, 17) << 2;
 243 }
 244 \f
 245 static int use_unwind = 0;
 246
 247 /* Lookup the unwind (stack backtrace) info for the given PC.  We search all
 248    of the objfiles seeking the unwind table entry for this PC.  Each objfile
 249    contains a sorted list of struct unwind_table_entry.  Since we do a binary
 250    search of the unwind tables, we depend upon them to be sorted.  */
 251
 252 static struct unwind_table_entry *
 253 find_unwind_entry(pc)
 254      CORE_ADDR pc;
 255 {
 256   int first, middle, last;
 257   struct objfile *objfile;
 258
 259   ALL_OBJFILES (objfile)
 260     {
 261       struct obj_unwind_info *ui;
 262
 263       ui = OBJ_UNWIND_INFO (objfile);
 264
 265       if (!ui)
 266         continue;
 267
 268       /* First, check the cache */
 269
 270       if (ui->cache
 271           && pc >= ui->cache->region_start
 272           && pc <= ui->cache->region_end)
 273         return ui->cache;
 274
 275       /* Not in the cache, do a binary search */
 276
 277       first = 0;
 278       last = ui->last;
 279
 280       while (first <= last)
 281         {
 282           middle = (first + last) / 2;
 283           if (pc >= ui->table[middle].region_start
 284               && pc <= ui->table[middle].region_end)
 285             {
 286               ui->cache = &ui->table[middle];
 287               return &ui->table[middle];
 288             }
 289
 290           if (pc < ui->table[middle].region_start)
 291             last = middle - 1;
 292           else
 293             first = middle + 1;
 294         }
 295     }                           /* ALL_OBJFILES() */
 296   return NULL;
 297 }
 298
 299 static int
 300 find_return_regnum(pc)
 301      CORE_ADDR pc;
 302 {
 303   struct unwind_table_entry *u;
 304
 305   u = find_unwind_entry (pc);
 306
 307   if (!u)
 308     return RP_REGNUM;
 309
 310   if (u->Millicode)
 311     return 31;
 312
 313   return RP_REGNUM;
 314 }
 315
 316 int
 317 find_proc_framesize(pc)
 318      CORE_ADDR pc;
 319 {
 320   struct unwind_table_entry *u;
 321
 322   if (!use_unwind)
 323     return -1;
 324
 325   u = find_unwind_entry (pc);
 326
 327   if (!u)
 328     return -1;
 329
 330   return u->Total_frame_size << 3;
 331 }
 332
 333 int
 334 rp_saved(pc)
 335 {
 336   struct unwind_table_entry *u;
 337
 338   u = find_unwind_entry (pc);
 339
 340   if (!u)
 341     return 0;
 342
 343   if (u->Save_RP)
 344     return 1;
 345   else
 346     return 0;
 347 }
 348 \f
 349 int
 350 frameless_function_invocation (frame)
 351      FRAME frame;
 352 {
 353
 354   if (use_unwind)
 355     {
 356       struct unwind_table_entry *u;
 357
 358       u = find_unwind_entry (frame->pc);
 359
 360       if (u == 0)
 361         return 0;
 362
 363       return (u->Total_frame_size == 0);
 364     }
 365   else
 366     return frameless_look_for_prologue (frame);
 367 }
 368
 369 CORE_ADDR
 370 saved_pc_after_call (frame)
 371      FRAME frame;
 372 {
 373   int ret_regnum;
 374
 375   ret_regnum = find_return_regnum (get_frame_pc (frame));
 376
 377   return read_register (ret_regnum) & ~0x3;
 378 }
 379 \f
 380 CORE_ADDR
 381 frame_saved_pc (frame)
 382      FRAME frame;
 383 {
 384   CORE_ADDR pc = get_frame_pc (frame);
 385
 386   if (frameless_function_invocation (frame))
 387     {
 388       int ret_regnum;
 389
 390       ret_regnum = find_return_regnum (pc);
 391
 392       return read_register (ret_regnum) & ~0x3;
 393     }
 394   else if (rp_saved (pc))
 395     return read_memory_integer (frame->frame - 20, 4) & ~0x3;
 396   else
 397     return read_register (RP_REGNUM) & ~0x3;
 398 }
 399 \f
 400 /* We need to correct the PC and the FP for the outermost frame when we are
 401    in a system call.  */
 402
 403 void
 404 init_extra_frame_info (fromleaf, frame)
 405      int fromleaf;
 406      struct frame_info *frame;
 407 {
 408   int flags;
 409   int framesize;
 410
 411   if (frame->next)              /* Only do this for outermost frame */
 412     return;
 413
 414   flags = read_register (FLAGS_REGNUM);
 415   if (flags & 2)        /* In system call? */
 416     frame->pc = read_register (31) & ~0x3;
 417
 418   /* The outermost frame is always derived from PC-framesize */
 419   framesize = find_proc_framesize(frame->pc);
 420   if (framesize == -1)
 421     frame->frame = read_register (FP_REGNUM);
 422   else
 423     frame->frame = read_register (SP_REGNUM) - framesize;
 424
 425   if (!frameless_function_invocation (frame)) /* Frameless? */
 426     return;                                 /* No, quit now */
 427
 428   /* For frameless functions, we need to look at the caller's frame */
 429   framesize = find_proc_framesize(FRAME_SAVED_PC(frame));
 430   if (framesize != -1)
 431     frame->frame -= framesize;
 432 }
 433 \f
 434 FRAME_ADDR
 435 frame_chain (frame)
 436      struct frame_info *frame;
 437 {
 438   int framesize;
 439
 440   framesize = find_proc_framesize(FRAME_SAVED_PC(frame));
 441
 442   if (framesize != -1)
 443     return frame->frame - framesize;
 444
 445   return read_memory_integer (frame->frame, 4);
 446 }
 447 \f
 448 /* To see if a frame chain is valid, see if the caller looks like it
 449    was compiled with gcc. */
 450
 451 int
 452 frame_chain_valid (chain, thisframe)
 453      FRAME_ADDR chain;
 454      FRAME thisframe;
 455 {
 456   struct minimal_symbol *msym;
 457
 458   if (!chain)
 459     return 0;
 460
 461   if (use_unwind)
 462     {
 463
 464       struct unwind_table_entry *u;
 465
 466       u = find_unwind_entry (thisframe->pc);
 467
 468       if (u && (u->Save_SP || u->Total_frame_size))
 469         return 1;
 470       else
 471         return 0;
 472     }
 473   else
 474     {
 475       msym = lookup_minimal_symbol_by_pc (FRAME_SAVED_PC (thisframe));
 476
 477       if (msym
 478           && (strcmp (SYMBOL_NAME (msym), "_start") == 0))
 479         return 0;
 480       else
 481         return 1;
 482     }
 483 }
 484
 485 /*
 486  * These functions deal with saving and restoring register state
 487  * around a function call in the inferior. They keep the stack
 488  * double-word aligned; eventually, on an hp700, the stack will have
 489  * to be aligned to a 64-byte boundary.
 490  */
 491
 492 int
 493 push_dummy_frame ()
 494 {
 495   register CORE_ADDR sp;
 496   register int regnum;
 497   int int_buffer;
 498   double freg_buffer;
 499
 500   /* Space for "arguments"; the RP goes in here. */
 501   sp = read_register (SP_REGNUM) + 48;
 502   int_buffer = read_register (RP_REGNUM) | 0x3;
 503   write_memory (sp - 20, (char *)&int_buffer, 4);
 504
 505   int_buffer = read_register (FP_REGNUM);
 506   write_memory (sp, (char *)&int_buffer, 4);
 507
 508   write_register (FP_REGNUM, sp);
 509
 510   sp += 8;
 511
 512   for (regnum = 1; regnum < 32; regnum++)
 513     if (regnum != RP_REGNUM && regnum != FP_REGNUM)
 514       sp = push_word (sp, read_register (regnum));
 515
 516   sp += 4;
 517
 518   for (regnum = FP0_REGNUM; regnum < NUM_REGS; regnum++)
 519     {
 520       read_register_bytes (REGISTER_BYTE (regnum), (char *)&freg_buffer, 8);
 521       sp = push_bytes (sp, (char *)&freg_buffer, 8);
 522     }
 523   sp = push_word (sp, read_register (IPSW_REGNUM));
 524   sp = push_word (sp, read_register (SAR_REGNUM));
 525   sp = push_word (sp, read_register (PCOQ_HEAD_REGNUM));
 526   sp = push_word (sp, read_register (PCSQ_HEAD_REGNUM));
 527   sp = push_word (sp, read_register (PCOQ_TAIL_REGNUM));
 528   sp = push_word (sp, read_register (PCSQ_TAIL_REGNUM));
 529   write_register (SP_REGNUM, sp);
 530 }
 531
 532 find_dummy_frame_regs (frame, frame_saved_regs)
 533      struct frame_info *frame;
 534      struct frame_saved_regs *frame_saved_regs;
 535 {
 536   CORE_ADDR fp = frame->frame;
 537   int i;
 538
 539   frame_saved_regs->regs[RP_REGNUM] = fp - 20 & ~0x3;
 540   frame_saved_regs->regs[FP_REGNUM] = fp;
 541   frame_saved_regs->regs[1] = fp + 8;
 542
 543   for (fp += 12, i = 3; i < 32; i++)
 544     {
 545       if (i != FP_REGNUM)
 546         {
 547           frame_saved_regs->regs[i] = fp;
 548           fp += 4;
 549         }
 550     }
 551
 552   fp += 4;
 553   for (i = FP0_REGNUM; i < NUM_REGS; i++, fp += 8)
 554     frame_saved_regs->regs[i] = fp;
 555
 556   frame_saved_regs->regs[IPSW_REGNUM] = fp;
 557   frame_saved_regs->regs[SAR_REGNUM] = fp + 4;
 558   frame_saved_regs->regs[PCOQ_HEAD_REGNUM] = fp + 8;
 559   frame_saved_regs->regs[PCSQ_HEAD_REGNUM] = fp + 12;
 560   frame_saved_regs->regs[PCOQ_TAIL_REGNUM] = fp + 16;
 561   frame_saved_regs->regs[PCSQ_TAIL_REGNUM] = fp + 20;
 562 }
 563
 564 int
 565 hppa_pop_frame ()
 566 {
 567   register FRAME frame = get_current_frame ();
 568   register CORE_ADDR fp;
 569   register int regnum;
 570   struct frame_saved_regs fsr;
 571   struct frame_info *fi;
 572   double freg_buffer;
 573
 574   fi = get_frame_info (frame);
 575   fp = fi->frame;
 576   get_frame_saved_regs (fi, &fsr);
 577
 578   if (fsr.regs[IPSW_REGNUM])    /* Restoring a call dummy frame */
 579     restore_pc_queue (&fsr);
 580
 581   for (regnum = 31; regnum > 0; regnum--)
 582     if (fsr.regs[regnum])
 583       write_register (regnum, read_memory_integer (fsr.regs[regnum], 4));
 584
 585   for (regnum = NUM_REGS - 1; regnum >= FP0_REGNUM ; regnum--)
 586     if (fsr.regs[regnum])
 587       {
 588         read_memory (fsr.regs[regnum], (char *)&freg_buffer, 8);
 589         write_register_bytes (REGISTER_BYTE (regnum), (char *)&freg_buffer, 8);
 590       }
 591
 592   if (fsr.regs[IPSW_REGNUM])
 593     write_register (IPSW_REGNUM,
 594                     read_memory_integer (fsr.regs[IPSW_REGNUM], 4));
 595
 596   if (fsr.regs[SAR_REGNUM])
 597     write_register (SAR_REGNUM,
 598                     read_memory_integer (fsr.regs[SAR_REGNUM], 4));
 599
 600   if (fsr.regs[PCOQ_TAIL_REGNUM])
 601     write_register (PCOQ_TAIL_REGNUM,
 602                     read_memory_integer (fsr.regs[PCOQ_TAIL_REGNUM], 4));
 603
 604   write_register (FP_REGNUM, read_memory_integer (fp, 4));
 605
 606   if (fsr.regs[IPSW_REGNUM])    /* call dummy */
 607     write_register (SP_REGNUM, fp - 48);
 608   else
 609     write_register (SP_REGNUM, fp);
 610
 611   flush_cached_frames ();
 612   set_current_frame (create_new_frame (read_register (FP_REGNUM),
 613                                        read_pc ()));
 614 }
 615
 616 /*
 617  * After returning to a dummy on the stack, restore the instruction
 618  * queue space registers. */
 619
 620 static int
 621 restore_pc_queue (fsr)
 622      struct frame_saved_regs *fsr;
 623 {
 624   CORE_ADDR pc = read_pc ();
 625   CORE_ADDR new_pc = read_memory_integer (fsr->regs[PCOQ_HEAD_REGNUM], 4);
 626   int pid;
 627   WAITTYPE w;
 628   int insn_count;
 629
 630   /* Advance past break instruction in the call dummy. */
 631   write_register (PCOQ_HEAD_REGNUM, pc + 4);
 632   write_register (PCOQ_TAIL_REGNUM, pc + 8);
 633
 634   /*
 635    * HPUX doesn't let us set the space registers or the space
 636    * registers of the PC queue through ptrace. Boo, hiss.
 637    * Conveniently, the call dummy has this sequence of instructions
 638    * after the break:
 639    *    mtsp r21, sr0
 640    *    ble,n 0(sr0, r22)
 641    *
 642    * So, load up the registers and single step until we are in the
 643    * right place.
 644    */
 645
 646   write_register (21, read_memory_integer (fsr->regs[PCSQ_HEAD_REGNUM], 4));
 647   write_register (22, new_pc);
 648
 649   for (insn_count = 0; insn_count < 3; insn_count++)
 650     {
 651       resume (1, 0);
 652       target_wait(&w);
 653
 654       if (!WIFSTOPPED (w))
 655         {
 656           stop_signal = WTERMSIG (w);
 657           terminal_ours_for_output ();
 658           printf ("\nProgram terminated with signal %d, %s\n",
 659                   stop_signal, safe_strsignal (stop_signal));
 660           fflush (stdout);
 661           return 0;
 662         }
 663     }
 664   fetch_inferior_registers (-1);
 665   return 1;
 666 }
 667
 668 CORE_ADDR
 669 hppa_push_arguments (nargs, args, sp, struct_return, struct_addr)
 670      int nargs;
 671      value *args;
 672      CORE_ADDR sp;
 673      int struct_return;
 674      CORE_ADDR struct_addr;
 675 {
 676   /* array of arguments' offsets */
 677   int *offset = (int *)alloca(nargs * sizeof (int));
 678   int cum = 0;
 679   int i, alignment;
 680
 681   for (i = 0; i < nargs; i++)
 682     {
 683       /* Coerce chars to int & float to double if necessary */
 684       args[i] = value_arg_coerce (args[i]);
 685
 686       cum += TYPE_LENGTH (VALUE_TYPE (args[i]));
 687
 688     /* value must go at proper alignment. Assume alignment is a
 689          power of two.*/
 690       alignment = hppa_alignof (VALUE_TYPE (args[i]));
 691       if (cum % alignment)
 692         cum = (cum + alignment) & -alignment;
 693       offset[i] = -cum;
 694     }
 695   sp += max ((cum + 7) & -8, 16);
 696
 697   for (i = 0; i < nargs; i++)
 698     write_memory (sp + offset[i], VALUE_CONTENTS (args[i]),
 699                   TYPE_LENGTH (VALUE_TYPE (args[i])));
 700
 701   if (struct_return)
 702     write_register (28, struct_addr);
 703   return sp + 32;
 704 }
 705
 706 /*
 707  * Insert the specified number of args and function address
 708  * into a call sequence of the above form stored at DUMMYNAME.
 709  *
 710  * On the hppa we need to call the stack dummy through $$dyncall.
 711  * Therefore our version of FIX_CALL_DUMMY takes an extra argument,
 712  * real_pc, which is the location where gdb should start up the
 713  * inferior to do the function call.
 714  */
 715
 716 CORE_ADDR
 717 hppa_fix_call_dummy (dummy, pc, fun, nargs, args, type, gcc_p)
 718      REGISTER_TYPE *dummy;
 719      CORE_ADDR pc;
 720      CORE_ADDR fun;
 721      int nargs;
 722      value *args;
 723      struct type *type;
 724      int gcc_p;
 725 {
 726   CORE_ADDR dyncall_addr, sr4export_addr;
 727   struct minimal_symbol *msymbol;
 728
 729   msymbol = lookup_minimal_symbol ("$$dyncall", (struct objfile *) NULL);
 730   if (msymbol == NULL)
 731     error ("Can't find an address for $$dyncall trampoline");
 732
 733   dyncall_addr = SYMBOL_VALUE_ADDRESS (msymbol);
 734
 735   msymbol = lookup_minimal_symbol ("_sr4export", (struct objfile *) NULL);
 736   if (msymbol == NULL)
 737     error ("Can't find an address for _sr4export trampoline");
 738
 739   sr4export_addr = SYMBOL_VALUE_ADDRESS (msymbol);
 740
 741   dummy[9] = deposit_21 (fun >> 11, dummy[9]);
 742   dummy[10] = deposit_14 (fun & MASK_11, dummy[10]);
 743   dummy[12] = deposit_21 (sr4export_addr >> 11, dummy[12]);
 744   dummy[13] = deposit_14 (sr4export_addr & MASK_11, dummy[13]);
 745
 746   write_register (22, pc);
 747
 748   return dyncall_addr;
 749 }
 750
 751 /* return the alignment of a type in bytes. Structures have the maximum
 752    alignment required by their fields. */
 753
 754 static int
 755 hppa_alignof (arg)
 756      struct type *arg;
 757 {
 758   int max_align, align, i;
 759   switch (TYPE_CODE (arg))
 760     {
 761     case TYPE_CODE_PTR:
 762     case TYPE_CODE_INT:
 763     case TYPE_CODE_FLT:
 764       return TYPE_LENGTH (arg);
 765     case TYPE_CODE_ARRAY:
 766       return hppa_alignof (TYPE_FIELD_TYPE (arg, 0));
 767     case TYPE_CODE_STRUCT:
 768     case TYPE_CODE_UNION:
 769       max_align = 2;
 770       for (i = 0; i < TYPE_NFIELDS (arg); i++)
 771         {
 772           /* Bit fields have no real alignment. */
 773           if (!TYPE_FIELD_BITPOS (arg, i))
 774             {
 775               align = hppa_alignof (TYPE_FIELD_TYPE (arg, i));
 776               max_align = max (max_align, align);
 777             }
 778         }
 779       return max_align;
 780     default:
 781       return 4;
 782     }
 783 }
 784
 785 /* Print the register regnum, or all registers if regnum is -1 */
 786
 787 pa_do_registers_info (regnum, fpregs)
 788      int regnum;
 789      int fpregs;
 790 {
 791   char raw_regs [REGISTER_BYTES];
 792   int i;
 793
 794   for (i = 0; i < NUM_REGS; i++)
 795     read_relative_register_raw_bytes (i, raw_regs + REGISTER_BYTE (i));
 796   if (regnum == -1)
 797     pa_print_registers (raw_regs, regnum, fpregs);
 798   else if (regnum < FP0_REGNUM)
 799     printf ("%s %x\n", reg_names[regnum], *(long *)(raw_regs +
 800                                                     REGISTER_BYTE (regnum)));
 801   else
 802     pa_print_fp_reg (regnum);
 803 }
 804
 805 pa_print_registers (raw_regs, regnum, fpregs)
 806      char *raw_regs;
 807      int regnum;
 808      int fpregs;
 809 {
 810   int i;
 811
 812   for (i = 0; i < 18; i++)
 813     printf ("%8.8s: %8x  %8.8s: %8x  %8.8s: %8x  %8.8s: %8x\n",
 814             reg_names[i],
 815             *(int *)(raw_regs + REGISTER_BYTE (i)),
 816             reg_names[i + 18],
 817             *(int *)(raw_regs + REGISTER_BYTE (i + 18)),
 818             reg_names[i + 36],
 819             *(int *)(raw_regs + REGISTER_BYTE (i + 36)),
 820             reg_names[i + 54],
 821             *(int *)(raw_regs + REGISTER_BYTE (i + 54)));
 822
 823   if (fpregs)
 824     for (i = 72; i < NUM_REGS; i++)
 825       pa_print_fp_reg (i);
 826 }
 827
 828 pa_print_fp_reg (i)
 829      int i;
 830 {
 831   unsigned char raw_buffer[MAX_REGISTER_RAW_SIZE];
 832   unsigned char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE];
 833   REGISTER_TYPE val;
 834
 835   /* Get the data in raw format, then convert also to virtual format.  */
 836   read_relative_register_raw_bytes (i, raw_buffer);
 837   REGISTER_CONVERT_TO_VIRTUAL (i, raw_buffer, virtual_buffer);
 838
 839   fputs_filtered (reg_names[i], stdout);
 840   print_spaces_filtered (15 - strlen (reg_names[i]), stdout);
 841
 842   val_print (REGISTER_VIRTUAL_TYPE (i), virtual_buffer, 0, stdout, 0,
 843              1, 0, Val_pretty_default);
 844   printf_filtered ("\n");
 845 }
 846
 847 /* Function calls that pass into a new compilation unit must pass through a
 848    small piece of code that does long format (`external' in HPPA parlance)
 849    jumps.  We figure out where the trampoline is going to end up, and return
 850    the PC of the final destination.  If we aren't in a trampoline, we just
 851    return NULL.
 852
 853    For computed calls, we just extract the new PC from r22.  */
 854
 855 CORE_ADDR
 856 skip_trampoline_code (pc, name)
 857      CORE_ADDR pc;
 858      char *name;
 859 {
 860   long inst0, inst1;
 861   static CORE_ADDR dyncall = 0;
 862   struct minimal_symbol *msym;
 863
 864 /* FIXME XXX - dyncall must be initialized whenever we get a new exec file */
 865
 866   if (!dyncall)
 867     {
 868       msym = lookup_minimal_symbol ("$$dyncall", NULL);
 869       if (msym)
 870         dyncall = SYMBOL_VALUE_ADDRESS (msym);
 871       else
 872         dyncall = -1;
 873     }
 874
 875   if (pc == dyncall)
 876     return (CORE_ADDR)(read_register (22) & ~0x3);
 877
 878   inst0 = read_memory_integer (pc, 4);
 879   inst1 = read_memory_integer (pc+4, 4);
 880
 881   if (   (inst0 & 0xffe00000) == 0x20200000 /* ldil xxx, r1 */
 882       && (inst1 & 0xffe0e002) == 0xe0202002) /* be,n yyy(sr4, r1) */
 883     pc = extract_21 (inst0) + extract_17 (inst1);
 884   else
 885     pc = (CORE_ADDR)NULL;
 886
 887   return pc;
 888 }
 889
 890 /* Advance PC across any function entry prologue instructions
 891    to reach some "real" code.  */
 892
 893 /* skip (stw rp, -20(0,sp)); copy 4,1; copy sp, 4; stwm 1,framesize(sp)
 894    for gcc, or (stw rp, -20(0,sp); stwm 1, framesize(sp) for hcc */
 895
 896 CORE_ADDR
 897 skip_prologue(pc)
 898      CORE_ADDR pc;
 899 {
 900   char buf[4];
 901   unsigned long inst;
 902   int status;
 903
 904   status = target_read_memory (pc, buf, 4);
 905   inst = extract_unsigned_integer (buf, 4);
 906   if (status != 0)
 907     return pc;
 908
 909   if (inst == 0x6BC23FD9)       /* stw rp,-20(sp) */
 910     {
 911       if (read_memory_integer (pc + 4, 4) == 0x8040241) /* copy r4,r1 */
 912         pc += 16;
 913       else if ((read_memory_integer (pc + 4, 4) & ~MASK_14) == 0x68810000) /* stw r1,(r4) */
 914         pc += 8;
 915     }
 916   else if (read_memory_integer (pc, 4) == 0x8040241) /* copy r4,r1 */
 917     pc += 12;
 918   else if ((read_memory_integer (pc, 4) & ~MASK_14) == 0x68810000) /* stw r1,(r4) */
 919     pc += 4;
 920
 921   return pc;
 922 }
 923
 924 static void
 925 unwind_command (exp, from_tty)
 926      char *exp;
 927      int from_tty;
 928 {
 929   CORE_ADDR address;
 930   union
 931     {
 932       int *foo;
 933       struct unwind_table_entry *u;
 934     } xxx;
 935
 936   /* If we have an expression, evaluate it and use it as the address.  */
 937
 938   if (exp != 0 && *exp != 0)
 939     address = parse_and_eval_address (exp);
 940   else
 941     return;
 942
 943   xxx.u = find_unwind_entry (address);
 944
 945   if (!xxx.u)
 946     {
 947       printf ("Can't find unwind table entry for PC 0x%x\n", address);
 948       return;
 949     }
 950
 951   printf ("%08x\n%08X\n%08X\n%08X\n", xxx.foo[0], xxx.foo[1], xxx.foo[2],
 952           xxx.foo[3]);
 953 }
 954
 955 void
 956 _initialize_hppa_tdep ()
 957 {
 958   add_com ("unwind", class_obscure, unwind_command, "Print unwind info\n");
 959   add_show_from_set
 960     (add_set_cmd ("use_unwind", class_obscure, var_boolean,
 961                   (char *)&use_unwind,
 962                   "Set the usage of unwind info", &setlist),
 963      &showlist);
 964 }