bfd/libhppa.h

   1 /* HP PA-RISC SOM object file format:  definitions internal to BFD.
   2    Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000,
   3    2003, 2005, 2007  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 BFD, the Binary File Descriptor library.
   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 3 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., 51 Franklin Street - Fifth Floor, Boston,
  23    MA 02110-1301, USA.  */
  24
  25 #ifndef _LIBHPPA_H
  26 #define _LIBHPPA_H
  27
  28 #define BYTES_IN_WORD 4
  29 #define PA_PAGESIZE 0x1000
  30
  31 /* The PA instruction set variants.  */
  32 enum pa_arch {pa10 = 10, pa11 = 11, pa20 = 20, pa20w = 25};
  33
  34 /* HP PA-RISC relocation types */
  35
  36 enum hppa_reloc_field_selector_type
  37   {
  38     R_HPPA_FSEL = 0x0,
  39     R_HPPA_LSSEL = 0x1,
  40     R_HPPA_RSSEL = 0x2,
  41     R_HPPA_LSEL = 0x3,
  42     R_HPPA_RSEL = 0x4,
  43     R_HPPA_LDSEL = 0x5,
  44     R_HPPA_RDSEL = 0x6,
  45     R_HPPA_LRSEL = 0x7,
  46     R_HPPA_RRSEL = 0x8,
  47     R_HPPA_NSEL  = 0x9,
  48     R_HPPA_NLSEL  = 0xa,
  49     R_HPPA_NLRSEL  = 0xb,
  50     R_HPPA_PSEL = 0xc,
  51     R_HPPA_LPSEL = 0xd,
  52     R_HPPA_RPSEL = 0xe,
  53     R_HPPA_TSEL = 0xf,
  54     R_HPPA_LTSEL = 0x10,
  55     R_HPPA_RTSEL = 0x11,
  56     R_HPPA_LTPSEL = 0x12,
  57     R_HPPA_RTPSEL = 0x13
  58   };
  59
  60 /* /usr/include/reloc.h defines these to constants.  We want to use
  61    them in enums, so #undef them before we start using them.  We might
  62    be able to fix this another way by simply managing not to include
  63    /usr/include/reloc.h, but currently GDB picks up these defines
  64    somewhere.  */
  65 #undef e_fsel
  66 #undef e_lssel
  67 #undef e_rssel
  68 #undef e_lsel
  69 #undef e_rsel
  70 #undef e_ldsel
  71 #undef e_rdsel
  72 #undef e_lrsel
  73 #undef e_rrsel
  74 #undef e_nsel
  75 #undef e_nlsel
  76 #undef e_nlrsel
  77 #undef e_psel
  78 #undef e_lpsel
  79 #undef e_rpsel
  80 #undef e_tsel
  81 #undef e_ltsel
  82 #undef e_rtsel
  83 #undef e_one
  84 #undef e_two
  85 #undef e_pcrel
  86 #undef e_con
  87 #undef e_plabel
  88 #undef e_abs
  89
  90 /* for compatibility */
  91 enum hppa_reloc_field_selector_type_alt
  92   {
  93     e_fsel = R_HPPA_FSEL,
  94     e_lssel = R_HPPA_LSSEL,
  95     e_rssel = R_HPPA_RSSEL,
  96     e_lsel = R_HPPA_LSEL,
  97     e_rsel = R_HPPA_RSEL,
  98     e_ldsel = R_HPPA_LDSEL,
  99     e_rdsel = R_HPPA_RDSEL,
 100     e_lrsel = R_HPPA_LRSEL,
 101     e_rrsel = R_HPPA_RRSEL,
 102     e_nsel = R_HPPA_NSEL,
 103     e_nlsel = R_HPPA_NLSEL,
 104     e_nlrsel = R_HPPA_NLRSEL,
 105     e_psel = R_HPPA_PSEL,
 106     e_lpsel = R_HPPA_LPSEL,
 107     e_rpsel = R_HPPA_RPSEL,
 108     e_tsel = R_HPPA_TSEL,
 109     e_ltsel = R_HPPA_LTSEL,
 110     e_rtsel = R_HPPA_RTSEL,
 111     e_ltpsel = R_HPPA_LTPSEL,
 112     e_rtpsel = R_HPPA_RTPSEL
 113   };
 114
 115 enum hppa_reloc_expr_type
 116   {
 117     R_HPPA_E_ONE = 0,
 118     R_HPPA_E_TWO = 1,
 119     R_HPPA_E_PCREL = 2,
 120     R_HPPA_E_CON = 3,
 121     R_HPPA_E_PLABEL = 7,
 122     R_HPPA_E_ABS = 18
 123   };
 124
 125 /* for compatibility */
 126 enum hppa_reloc_expr_type_alt
 127   {
 128     e_one = R_HPPA_E_ONE,
 129     e_two = R_HPPA_E_TWO,
 130     e_pcrel = R_HPPA_E_PCREL,
 131     e_con = R_HPPA_E_CON,
 132     e_plabel = R_HPPA_E_PLABEL,
 133     e_abs = R_HPPA_E_ABS
 134   };
 135
 136
 137 /* Relocations for function calls must be accompanied by parameter
 138    relocation bits.  These bits describe exactly where the caller has
 139    placed the function's arguments and where it expects to find a return
 140    value.
 141
 142    Both ELF and SOM encode this information within the addend field
 143    of the call relocation.  (Note this could break very badly if one
 144    was to make a call like bl foo + 0x12345678).
 145
 146    The high order 10 bits contain parameter relocation information,
 147    the low order 22 bits contain the constant offset.  */
 148
 149 #define HPPA_R_ARG_RELOC(a)     \
 150   (((a) >> 22) & 0x3ff)
 151 #define HPPA_R_CONSTANT(a)      \
 152   ((((bfd_signed_vma)(a)) << (BFD_ARCH_SIZE-22)) >> (BFD_ARCH_SIZE-22))
 153 #define HPPA_R_ADDEND(r, c)     \
 154   (((r) << 22) + ((c) & 0x3fffff))
 155
 156
 157 /* Some functions to manipulate PA instructions.  */
 158
 159 /* Declare the functions with the unused attribute to avoid warnings.  */
 160 static inline int sign_extend (int, int) ATTRIBUTE_UNUSED;
 161 static inline int low_sign_extend (int, int) ATTRIBUTE_UNUSED;
 162 static inline int sign_unext (int, int) ATTRIBUTE_UNUSED;
 163 static inline int low_sign_unext (int, int) ATTRIBUTE_UNUSED;
 164 static inline int re_assemble_3 (int) ATTRIBUTE_UNUSED;
 165 static inline int re_assemble_12 (int) ATTRIBUTE_UNUSED;
 166 static inline int re_assemble_14 (int) ATTRIBUTE_UNUSED;
 167 static inline int re_assemble_16 (int) ATTRIBUTE_UNUSED;
 168 static inline int re_assemble_17 (int) ATTRIBUTE_UNUSED;
 169 static inline int re_assemble_21 (int) ATTRIBUTE_UNUSED;
 170 static inline int re_assemble_22 (int) ATTRIBUTE_UNUSED;
 171 static inline bfd_signed_vma hppa_field_adjust
 172   (bfd_vma, bfd_signed_vma, enum hppa_reloc_field_selector_type_alt)
 173   ATTRIBUTE_UNUSED;
 174 static inline int bfd_hppa_insn2fmt (bfd *, int) ATTRIBUTE_UNUSED;
 175 static inline int hppa_rebuild_insn (int, int, int) ATTRIBUTE_UNUSED;
 176
 177
 178 /* The *sign_extend functions are used to assemble various bitfields
 179    taken from an instruction and return the resulting immediate
 180    value.  */
 181
 182 static inline int
 183 sign_extend (int x, int len)
 184 {
 185   int signbit = (1 << (len - 1));
 186   int mask = (signbit << 1) - 1;
 187   return ((x & mask) ^ signbit) - signbit;
 188 }
 189
 190 static inline int
 191 low_sign_extend (int x, int len)
 192 {
 193   return (x >> 1) - ((x & 1) << (len - 1));
 194 }
 195
 196
 197 /* The re_assemble_* functions prepare an immediate value for
 198    insertion into an opcode. pa-risc uses all sorts of weird bitfields
 199    in the instruction to hold the value.  */
 200
 201 static inline int
 202 sign_unext (int x, int len)
 203 {
 204   int len_ones;
 205
 206   len_ones = (1 << len) - 1;
 207
 208   return x & len_ones;
 209 }
 210
 211 static inline int
 212 low_sign_unext (int x, int len)
 213 {
 214   int temp;
 215   int sign;
 216
 217   sign = (x >> (len-1)) & 1;
 218
 219   temp = sign_unext (x, len-1);
 220
 221   return (temp << 1) | sign;
 222 }
 223
 224 static inline int
 225 re_assemble_3 (int as3)
 226 {
 227   return ((  (as3 & 4) << (13-2))
 228           | ((as3 & 3) << (13+1)));
 229 }
 230
 231 static inline int
 232 re_assemble_12 (int as12)
 233 {
 234   return ((  (as12 & 0x800) >> 11)
 235           | ((as12 & 0x400) >> (10 - 2))
 236           | ((as12 & 0x3ff) << (1 + 2)));
 237 }
 238
 239 static inline int
 240 re_assemble_14 (int as14)
 241 {
 242   return ((  (as14 & 0x1fff) << 1)
 243           | ((as14 & 0x2000) >> 13));
 244 }
 245
 246 static inline int
 247 re_assemble_16 (int as16)
 248 {
 249   int s, t;
 250
 251   /* Unusual 16-bit encoding, for wide mode only.  */
 252   t = (as16 << 1) & 0xffff;
 253   s = (as16 & 0x8000);
 254   return (t ^ s ^ (s >> 1)) | (s >> 15);
 255 }
 256
 257 static inline int
 258 re_assemble_17 (int as17)
 259 {
 260   return ((  (as17 & 0x10000) >> 16)
 261           | ((as17 & 0x0f800) << (16 - 11))
 262           | ((as17 & 0x00400) >> (10 - 2))
 263           | ((as17 & 0x003ff) << (1 + 2)));
 264 }
 265
 266 static inline int
 267 re_assemble_21 (int as21)
 268 {
 269   return ((  (as21 & 0x100000) >> 20)
 270           | ((as21 & 0x0ffe00) >> 8)
 271           | ((as21 & 0x000180) << 7)
 272           | ((as21 & 0x00007c) << 14)
 273           | ((as21 & 0x000003) << 12));
 274 }
 275
 276 static inline int
 277 re_assemble_22 (int as22)
 278 {
 279   return ((  (as22 & 0x200000) >> 21)
 280           | ((as22 & 0x1f0000) << (21 - 16))
 281           | ((as22 & 0x00f800) << (16 - 11))
 282           | ((as22 & 0x000400) >> (10 - 2))
 283           | ((as22 & 0x0003ff) << (1 + 2)));
 284 }
 285
 286
 287 /* Handle field selectors for PA instructions.
 288    The L and R (and LS, RS etc.) selectors are used in pairs to form a
 289    full 32 bit address.  eg.
 290
 291    LDIL L'start,%r1             ; put left part into r1
 292    LDW  R'start(%r1),%r2        ; add r1 and right part to form address
 293
 294    This function returns sign extended values in all cases.
 295 */
 296
 297 static inline bfd_signed_vma
 298 hppa_field_adjust (bfd_vma sym_val,
 299                    bfd_signed_vma addend,
 300                    enum hppa_reloc_field_selector_type_alt r_field)
 301 {
 302   bfd_signed_vma value;
 303
 304   value = sym_val + addend;
 305   switch (r_field)
 306     {
 307     case e_fsel:
 308       /* F: No change.  */
 309       break;
 310
 311     case e_nsel:
 312       /* N: null selector.  I don't really understand what this is all
 313          about, but HP's documentation says "this indicates that zero
 314          bits are to be used for the displacement on the instruction.
 315          This fixup is used to identify three-instruction sequences to
 316          access data (for importing shared library data)."  */
 317       value = 0;
 318       break;
 319
 320     case e_lsel:
 321     case e_nlsel:
 322       /* L:  Select top 21 bits.  */
 323       value = value >> 11;
 324       break;
 325
 326     case e_rsel:
 327       /* R:  Select bottom 11 bits.  */
 328       value = value & 0x7ff;
 329       break;
 330
 331     case e_lssel:
 332       /* LS:  Round to nearest multiple of 2048 then select top 21 bits.  */
 333       value = value + 0x400;
 334       value = value >> 11;
 335       break;
 336
 337     case e_rssel:
 338       /* RS:  Select bottom 11 bits for LS.
 339          We need to return a value such that 2048 * LS'x + RS'x == x.
 340          ie. RS'x = x - ((x + 0x400) & -0x800)
 341          this is just a sign extension from bit 21.  */
 342       value = ((value & 0x7ff) ^ 0x400) - 0x400;
 343       break;
 344
 345     case e_ldsel:
 346       /* LD:  Round to next multiple of 2048 then select top 21 bits.
 347          Yes, if we are already on a multiple of 2048, we go up to the
 348          next one.  RD in this case will be -2048.  */
 349       value = value + 0x800;
 350       value = value >> 11;
 351       break;
 352
 353     case e_rdsel:
 354       /* RD:  Set bits 0-20 to one.  */
 355       value = value | -0x800;
 356       break;
 357
 358     case e_lrsel:
 359     case e_nlrsel:
 360       /* LR:  L with rounding of the addend to nearest 8k.  */
 361       value = sym_val + ((addend + 0x1000) & -0x2000);
 362       value = value >> 11;
 363       break;
 364
 365     case e_rrsel:
 366       /* RR:  R with rounding of the addend to nearest 8k.
 367          We need to return a value such that 2048 * LR'x + RR'x == x
 368          ie. RR'x = s+a - (s + (((a + 0x1000) & -0x2000) & -0x800))
 369          .        = s+a - ((s & -0x800) + ((a + 0x1000) & -0x2000))
 370          .        = (s & 0x7ff) + a - ((a + 0x1000) & -0x2000)  */
 371       value = (sym_val & 0x7ff) + (((addend & 0x1fff) ^ 0x1000) - 0x1000);
 372       break;
 373
 374     default:
 375       abort ();
 376     }
 377   return value;
 378 }
 379
 380 /* PA-RISC OPCODES */
 381 #define get_opcode(insn)        (((insn) >> 26) & 0x3f)
 382
 383 enum hppa_opcode_type
 384 {
 385   /* None of the opcodes in the first group generate relocs, so we
 386      aren't too concerned about them.  */
 387   OP_SYSOP   = 0x00,
 388   OP_MEMMNG  = 0x01,
 389   OP_ALU     = 0x02,
 390   OP_NDXMEM  = 0x03,
 391   OP_SPOP    = 0x04,
 392   OP_DIAG    = 0x05,
 393   OP_FMPYADD = 0x06,
 394   OP_UNDEF07 = 0x07,
 395   OP_COPRW   = 0x09,
 396   OP_COPRDW  = 0x0b,
 397   OP_COPR    = 0x0c,
 398   OP_FLOAT   = 0x0e,
 399   OP_PRDSPEC = 0x0f,
 400   OP_UNDEF15 = 0x15,
 401   OP_UNDEF1d = 0x1d,
 402   OP_FMPYSUB = 0x26,
 403   OP_FPFUSED = 0x2e,
 404   OP_SHEXDP0 = 0x34,
 405   OP_SHEXDP1 = 0x35,
 406   OP_SHEXDP2 = 0x36,
 407   OP_UNDEF37 = 0x37,
 408   OP_SHEXDP3 = 0x3c,
 409   OP_SHEXDP4 = 0x3d,
 410   OP_MULTMED = 0x3e,
 411   OP_UNDEF3f = 0x3f,
 412
 413   OP_LDIL    = 0x08,
 414   OP_ADDIL   = 0x0a,
 415
 416   OP_LDO     = 0x0d,
 417   OP_LDB     = 0x10,
 418   OP_LDH     = 0x11,
 419   OP_LDW     = 0x12,
 420   OP_LDWM    = 0x13,
 421   OP_STB     = 0x18,
 422   OP_STH     = 0x19,
 423   OP_STW     = 0x1a,
 424   OP_STWM    = 0x1b,
 425
 426   OP_LDD     = 0x14,
 427   OP_STD     = 0x1c,
 428
 429   OP_FLDW    = 0x16,
 430   OP_LDWL    = 0x17,
 431   OP_FSTW    = 0x1e,
 432   OP_STWL    = 0x1f,
 433
 434   OP_COMBT   = 0x20,
 435   OP_COMIBT  = 0x21,
 436   OP_COMBF   = 0x22,
 437   OP_COMIBF  = 0x23,
 438   OP_CMPBDT  = 0x27,
 439   OP_ADDBT   = 0x28,
 440   OP_ADDIBT  = 0x29,
 441   OP_ADDBF   = 0x2a,
 442   OP_ADDIBF  = 0x2b,
 443   OP_CMPBDF  = 0x2f,
 444   OP_BVB     = 0x30,
 445   OP_BB      = 0x31,
 446   OP_MOVB    = 0x32,
 447   OP_MOVIB   = 0x33,
 448   OP_CMPIBD  = 0x3b,
 449
 450   OP_COMICLR = 0x24,
 451   OP_SUBI    = 0x25,
 452   OP_ADDIT   = 0x2c,
 453   OP_ADDI    = 0x2d,
 454
 455   OP_BE      = 0x38,
 456   OP_BLE     = 0x39,
 457   OP_BL      = 0x3a
 458 };
 459
 460
 461 /* Given a machine instruction, return its format.  */
 462
 463 static inline int
 464 bfd_hppa_insn2fmt (bfd *abfd, int insn)
 465 {
 466   enum hppa_opcode_type op = get_opcode (insn);
 467
 468   switch (op)
 469     {
 470     case OP_COMICLR:
 471     case OP_SUBI:
 472     case OP_ADDIT:
 473     case OP_ADDI:
 474       return 11;
 475
 476     case OP_COMBT:
 477     case OP_COMIBT:
 478     case OP_COMBF:
 479     case OP_COMIBF:
 480     case OP_CMPBDT:
 481     case OP_ADDBT:
 482     case OP_ADDIBT:
 483     case OP_ADDBF:
 484     case OP_ADDIBF:
 485     case OP_CMPBDF:
 486     case OP_BVB:
 487     case OP_BB:
 488     case OP_MOVB:
 489     case OP_MOVIB:
 490     case OP_CMPIBD:
 491       return 12;
 492
 493     case OP_LDO:
 494     case OP_LDB:
 495     case OP_LDH:
 496     case OP_LDW:
 497     case OP_LDWM:
 498     case OP_STB:
 499     case OP_STH:
 500     case OP_STW:
 501     case OP_STWM:
 502       if (abfd->arch_info->mach >= 25)
 503         return 16;      /* Wide mode, format 16.  */
 504       return 14;
 505
 506     case OP_FLDW:
 507     case OP_LDWL:
 508     case OP_FSTW:
 509     case OP_STWL:
 510       /* This is a hack.  Unfortunately, format 11 is already taken
 511          and we're using integers rather than an enum, so it's hard
 512          to describe the 11a format.  */
 513       if (abfd->arch_info->mach >= 25)
 514         return -16;     /* Wide mode, format 16a.  */
 515       return -11;
 516
 517     case OP_LDD:
 518     case OP_STD:
 519       if (abfd->arch_info->mach >= 25)
 520         return -10;     /* Wide mode, format 10a.  */
 521       return 10;
 522
 523     case OP_BL:
 524       if ((insn & 0x8000) != 0)
 525         return 22;
 526       /* fall thru */
 527     case OP_BE:
 528     case OP_BLE:
 529       return 17;
 530
 531     case OP_LDIL:
 532     case OP_ADDIL:
 533       return 21;
 534
 535     default:
 536       break;
 537     }
 538   return 32;
 539 }
 540
 541
 542 /* Insert VALUE into INSN using R_FORMAT to determine exactly what
 543    bits to change.  */
 544
 545 static inline int
 546 hppa_rebuild_insn (int insn, int value, int r_format)
 547 {
 548   switch (r_format)
 549     {
 550     case 11:
 551       return (insn & ~ 0x7ff) | low_sign_unext (value, 11);
 552
 553     case 12:
 554       return (insn & ~ 0x1ffd) | re_assemble_12 (value);
 555
 556
 557     case 10:
 558       return (insn & ~ 0x3ff1) | re_assemble_14 (value & -8);
 559
 560     case -11:
 561       return (insn & ~ 0x3ff9) | re_assemble_14 (value & -4);
 562
 563     case 14:
 564       return (insn & ~ 0x3fff) | re_assemble_14 (value);
 565
 566
 567     case -10:
 568       return (insn & ~ 0xfff1) | re_assemble_16 (value & -8);
 569
 570     case -16:
 571       return (insn & ~ 0xfff9) | re_assemble_16 (value & -4);
 572
 573     case 16:
 574       return (insn & ~ 0xffff) | re_assemble_16 (value);
 575
 576
 577     case 17:
 578       return (insn & ~ 0x1f1ffd) | re_assemble_17 (value);
 579
 580     case 21:
 581       return (insn & ~ 0x1fffff) | re_assemble_21 (value);
 582
 583     case 22:
 584       return (insn & ~ 0x3ff1ffd) | re_assemble_22 (value);
 585
 586     case 32:
 587       return value;
 588
 589     default:
 590       abort ();
 591     }
 592   return insn;
 593 }
 594
 595 #endif /* _LIBHPPA_H */