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