dyld/launch-cache/MachOFileAbstraction.hpp

   1 /* -*- mode: C++; c-basic-offset: 4; tab-width: 4 -*-
   2  *
   3  * Copyright (c) 2005 Apple Computer, Inc. All rights reserved.
   4  *
   5  * @APPLE_LICENSE_HEADER_START@
   6  *
   7  * This file contains Original Code and/or Modifications of Original Code
   8  * as defined in and that are subject to the Apple Public Source License
   9  * Version 2.0 (the 'License'). You may not use this file except in
  10  * compliance with the License. Please obtain a copy of the License at
  11  * http://www.opensource.apple.com/apsl/ and read it before using this
  12  * file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  19  * Please see the License for the specific language governing rights and
  20  * limitations under the License.
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23 */
  24 #ifndef __MACH_O_FILE_ABSTRACTION__
  25 #define __MACH_O_FILE_ABSTRACTION__
  26
  27 #include <mach-o/loader.h>
  28 #include <mach-o/nlist.h>
  29 #include <mach-o/reloc.h>
  30 #include <mach/machine.h>
  31
  32 // suport older versions of mach-o/loader.h
  33 #ifndef LC_UUID
  34 #define LC_UUID         0x1b
  35 struct uuid_command {
  36     uint32_t    cmd;            /* LC_UUID */
  37     uint32_t    cmdsize;        /* sizeof(struct uuid_command) */
  38     uint8_t     uuid[16];       /* the 128-bit uuid */
  39 };
  40 #endif
  41
  42 #ifndef S_16BYTE_LITERALS
  43         #define S_16BYTE_LITERALS 0xE
  44 #endif
  45
  46 #ifndef CPU_SUBTYPE_ARM_V5TEJ
  47         #define CPU_SUBTYPE_ARM_V5TEJ           ((cpu_subtype_t) 7)
  48 #endif
  49 #ifndef CPU_SUBTYPE_ARM_XSCALE
  50         #define CPU_SUBTYPE_ARM_XSCALE          ((cpu_subtype_t) 8)
  51 #endif
  52 #ifndef CPU_SUBTYPE_ARM_V7
  53         #define CPU_SUBTYPE_ARM_V7                      ((cpu_subtype_t) 9)
  54 #endif
  55 #ifndef CPU_SUBTYPE_ARM_V7F
  56         #define CPU_SUBTYPE_ARM_V7F                     ((cpu_subtype_t) 10)
  57 #endif
  58 #ifndef CPU_SUBTYPE_ARM_V7K
  59         #define CPU_SUBTYPE_ARM_V7K                     ((cpu_subtype_t) 12)
  60 #endif
  61 #ifndef CPU_SUBTYPE_ARM_V7S
  62         #define CPU_SUBTYPE_ARM_V7S                     ((cpu_subtype_t) 11)
  63 #endif
  64 #ifndef CPU_SUBTYPE_ARM64_ALL
  65         #define CPU_SUBTYPE_ARM64_ALL           ((cpu_subtype_t) 0)
  66 #endif
  67 #ifndef CPU_TYPE_ARM64
  68         #define CPU_TYPE_ARM64                          ((cpu_type_t) (CPU_TYPE_ARM | CPU_ARCH_ABI64))
  69 #endif
  70
  71 #define ARM64_RELOC_UNSIGNED            0 // for pointers
  72
  73
  74 #ifndef LC_LOAD_UPWARD_DYLIB
  75         #define LC_LOAD_UPWARD_DYLIB (0x23|LC_REQ_DYLD) /* load of dylib whose initializers run later */
  76 #endif
  77
  78 #ifndef EXPORT_SYMBOL_FLAGS_STUB_AND_RESOLVER
  79         #define EXPORT_SYMBOL_FLAGS_STUB_AND_RESOLVER 0x10
  80 #endif
  81 #ifndef EXPORT_SYMBOL_FLAGS_REEXPORT
  82         #define EXPORT_SYMBOL_FLAGS_REEXPORT 0x08
  83 #endif
  84
  85 #ifndef LC_FUNCTION_STARTS
  86         #define LC_FUNCTION_STARTS 0x26
  87 #endif
  88
  89 #ifndef LC_DATA_IN_CODE
  90         #define LC_DATA_IN_CODE 0x29
  91 #endif
  92
  93 #ifndef LC_DYLIB_CODE_SIGN_DRS
  94         #define LC_DYLIB_CODE_SIGN_DRS 0x2B
  95 #endif
  96
  97 #ifndef CPU_SUBTYPE_X86_64_H
  98         #define CPU_SUBTYPE_X86_64_H            ((cpu_subtype_t) 8)
  99 #endif
 100
 101
 102 #include "FileAbstraction.hpp"
 103 #include "Architectures.hpp"
 104
 105 // utility to pair together a cpu-type and cpu-sub-type
 106 struct ArchPair
 107 {
 108         uint32_t        arch;
 109         uint32_t        subtype;
 110
 111         ArchPair(uint32_t cputype, uint32_t cpusubtype) : arch(cputype), subtype(cpusubtype) {}
 112
 113         bool operator<(const ArchPair& other) const {
 114                 if ( this->arch != other.arch )
 115                         return (this->arch < other.arch);
 116                 return (this->subtype < other.subtype);
 117         }
 118 };
 119
 120
 121 //
 122 // This abstraction layer makes every mach-o file look like a 64-bit mach-o file with native endianness
 123 //
 124
 125 //
 126 // mach-o load command
 127 //
 128 template <typename P>
 129 class macho_load_command {
 130 public:
 131         uint32_t                cmd() const                                             INLINE { return E::get32(command.cmd); }
 132         void                    set_cmd(uint32_t value)                 INLINE { E::set32(command.cmd, value); }
 133
 134         uint32_t                cmdsize() const                                 INLINE { return E::get32(command.cmdsize); }
 135         void                    set_cmdsize(uint32_t value)             INLINE { E::set32(command.cmdsize, value); }
 136
 137         typedef typename P::E           E;
 138 private:
 139         load_command    command;
 140 };
 141
 142
 143 //
 144 // mach-o segment load command
 145 //
 146 template <typename P> struct macho_segment_content {};
 147 template <> struct macho_segment_content<Pointer32<BigEndian> >    { segment_command    fields; enum { CMD = LC_SEGMENT         }; };
 148 template <> struct macho_segment_content<Pointer64<BigEndian> >    { segment_command_64 fields; enum { CMD = LC_SEGMENT_64      }; };
 149 template <> struct macho_segment_content<Pointer32<LittleEndian> > { segment_command    fields; enum { CMD = LC_SEGMENT         }; };
 150 template <> struct macho_segment_content<Pointer64<LittleEndian> > { segment_command_64 fields; enum { CMD = LC_SEGMENT_64      }; };
 151
 152 template <typename P>
 153 class macho_segment_command {
 154 public:
 155         uint32_t                cmd() const                                             INLINE { return E::get32(segment.fields.cmd); }
 156         void                    set_cmd(uint32_t value)                 INLINE { E::set32(segment.fields.cmd, value); }
 157
 158         uint32_t                cmdsize() const                                 INLINE { return E::get32(segment.fields.cmdsize); }
 159         void                    set_cmdsize(uint32_t value)             INLINE { E::set32(segment.fields.cmdsize, value); }
 160
 161         const char*             segname() const                                 INLINE { return segment.fields.segname; }
 162         void                    set_segname(const char* value)  INLINE { strncpy(segment.fields.segname, value, 16); }
 163
 164         uint64_t                vmaddr() const                                  INLINE { return P::getP(segment.fields.vmaddr); }
 165         void                    set_vmaddr(uint64_t value)              INLINE { P::setP(segment.fields.vmaddr, value); }
 166
 167         uint64_t                vmsize() const                                  INLINE { return P::getP(segment.fields.vmsize); }
 168         void                    set_vmsize(uint64_t value)              INLINE { P::setP(segment.fields.vmsize, value); }
 169
 170         uint64_t                fileoff() const                                 INLINE { return P::getP(segment.fields.fileoff); }
 171         void                    set_fileoff(uint64_t value)             INLINE { P::setP(segment.fields.fileoff, value); }
 172
 173         uint64_t                filesize() const                                INLINE { return P::getP(segment.fields.filesize); }
 174         void                    set_filesize(uint64_t value)    INLINE { P::setP(segment.fields.filesize, value); }
 175
 176         uint32_t                maxprot() const                                 INLINE { return E::get32(segment.fields.maxprot); }
 177         void                    set_maxprot(uint32_t value)             INLINE { E::set32((uint32_t&)segment.fields.maxprot, value); }
 178
 179         uint32_t                initprot() const                                INLINE { return E::get32(segment.fields.initprot); }
 180         void                    set_initprot(uint32_t value)    INLINE { E::set32((uint32_t&)segment.fields.initprot, value); }
 181
 182         uint32_t                nsects() const                                  INLINE { return E::get32(segment.fields.nsects); }
 183         void                    set_nsects(uint32_t value)              INLINE { E::set32(segment.fields.nsects, value); }
 184
 185         uint32_t                flags() const                                   INLINE { return E::get32(segment.fields.flags); }
 186         void                    set_flags(uint32_t value)               INLINE { E::set32(segment.fields.flags, value); }
 187
 188         enum {
 189                 CMD = macho_segment_content<P>::CMD
 190         };
 191
 192         typedef typename P::E           E;
 193 private:
 194         macho_segment_content<P>        segment;
 195 };
 196
 197
 198 //
 199 // mach-o section
 200 //
 201 template <typename P> struct macho_section_content {};
 202 template <> struct macho_section_content<Pointer32<BigEndian> >    { section    fields; };
 203 template <> struct macho_section_content<Pointer64<BigEndian> >    { section_64 fields; };
 204 template <> struct macho_section_content<Pointer32<LittleEndian> > { section    fields; };
 205 template <> struct macho_section_content<Pointer64<LittleEndian> > { section_64 fields; };
 206
 207 template <typename P>
 208 class macho_section {
 209 public:
 210         const char*             sectname() const                                INLINE { return section.fields.sectname; }
 211         void                    set_sectname(const char* value) INLINE { strncpy(section.fields.sectname, value, 16); }
 212
 213         const char*             segname() const                                 INLINE { return section.fields.segname; }
 214         void                    set_segname(const char* value)  INLINE { strncpy(section.fields.segname, value, 16); }
 215
 216         uint64_t                addr() const                                    INLINE { return P::getP(section.fields.addr); }
 217         void                    set_addr(uint64_t value)                INLINE { P::setP(section.fields.addr, value); }
 218
 219         uint64_t                size() const                                    INLINE { return P::getP(section.fields.size); }
 220         void                    set_size(uint64_t value)                INLINE { P::setP(section.fields.size, value); }
 221
 222         uint32_t                offset() const                                  INLINE { return E::get32(section.fields.offset); }
 223         void                    set_offset(uint32_t value)              INLINE { E::set32(section.fields.offset, value); }
 224
 225         uint32_t                align() const                                   INLINE { return E::get32(section.fields.align); }
 226         void                    set_align(uint32_t value)               INLINE { E::set32(section.fields.align, value); }
 227
 228         uint32_t                reloff() const                                  INLINE { return E::get32(section.fields.reloff); }
 229         void                    set_reloff(uint32_t value)              INLINE { E::set32(section.fields.reloff, value); }
 230
 231         uint32_t                nreloc() const                                  INLINE { return E::get32(section.fields.nreloc); }
 232         void                    set_nreloc(uint32_t value)              INLINE { E::set32(section.fields.nreloc, value); }
 233
 234         uint32_t                flags() const                                   INLINE { return E::get32(section.fields.flags); }
 235         void                    set_flags(uint32_t value)               INLINE { E::set32(section.fields.flags, value); }
 236
 237         uint32_t                reserved1() const                               INLINE { return E::get32(section.fields.reserved1); }
 238         void                    set_reserved1(uint32_t value)   INLINE { E::set32(section.fields.reserved1, value); }
 239
 240         uint32_t                reserved2() const                               INLINE { return E::get32(section.fields.reserved2); }
 241         void                    set_reserved2(uint32_t value)   INLINE { E::set32(section.fields.reserved2, value); }
 242
 243         typedef typename P::E           E;
 244 private:
 245         macho_section_content<P>        section;
 246 };
 247
 248
 249 //
 250 // mach-o dylib load command
 251 //
 252 template <typename P>
 253 class macho_dylib_command {
 254 public:
 255         uint32_t                cmd() const                                                                     INLINE { return E::get32(fields.cmd); }
 256         void                    set_cmd(uint32_t value)                                         INLINE { E::set32(fields.cmd, value); }
 257
 258         uint32_t                cmdsize() const                                                         INLINE { return E::get32(fields.cmdsize); }
 259         void                    set_cmdsize(uint32_t value)                                     INLINE { E::set32(fields.cmdsize, value); }
 260
 261         uint32_t                name_offset() const                                                     INLINE { return E::get32(fields.dylib.name.offset); }
 262         void                    set_name_offset(uint32_t value)                         INLINE { E::set32(fields.dylib.name.offset, value);  }
 263
 264         uint32_t                timestamp() const                                                       INLINE { return E::get32(fields.dylib.timestamp); }
 265         void                    set_timestamp(uint32_t value)                           INLINE { E::set32(fields.dylib.timestamp, value); }
 266
 267         uint32_t                current_version() const                                         INLINE { return E::get32(fields.dylib.current_version); }
 268         void                    set_current_version(uint32_t value)                     INLINE { E::set32(fields.dylib.current_version, value); }
 269
 270         uint32_t                compatibility_version() const                           INLINE { return E::get32(fields.dylib.compatibility_version); }
 271         void                    set_compatibility_version(uint32_t value)       INLINE { E::set32(fields.dylib.compatibility_version, value); }
 272
 273         const char*             name() const                                                            INLINE { return (const char*)&fields + name_offset(); }
 274         void                    set_name_offset()                                                       INLINE { set_name_offset(sizeof(fields)); }
 275
 276         typedef typename P::E           E;
 277 private:
 278         dylib_command   fields;
 279 };
 280
 281
 282 //
 283 // mach-o dylinker load command
 284 //
 285 template <typename P>
 286 class macho_dylinker_command {
 287 public:
 288         uint32_t                cmd() const                                                     INLINE { return E::get32(fields.cmd); }
 289         void                    set_cmd(uint32_t value)                         INLINE { E::set32(fields.cmd, value); }
 290
 291         uint32_t                cmdsize() const                                         INLINE { return E::get32(fields.cmdsize); }
 292         void                    set_cmdsize(uint32_t value)                     INLINE { E::set32(fields.cmdsize, value); }
 293
 294         uint32_t                name_offset() const                                     INLINE { return E::get32(fields.name.offset); }
 295         void                    set_name_offset(uint32_t value)         INLINE { E::set32(fields.name.offset, value);  }
 296
 297         const char*             name() const                                            INLINE { return (const char*)&fields + name_offset(); }
 298         void                    set_name_offset()                                       INLINE { set_name_offset(sizeof(fields)); }
 299
 300         typedef typename P::E           E;
 301 private:
 302         dylinker_command        fields;
 303 };
 304
 305
 306 //
 307 // mach-o sub_framework load command
 308 //
 309 template <typename P>
 310 class macho_sub_framework_command {
 311 public:
 312         uint32_t                cmd() const                                                     INLINE { return E::get32(fields.cmd); }
 313         void                    set_cmd(uint32_t value)                         INLINE { E::set32(fields.cmd, value); }
 314
 315         uint32_t                cmdsize() const                                         INLINE { return E::get32(fields.cmdsize); }
 316         void                    set_cmdsize(uint32_t value)                     INLINE { E::set32(fields.cmdsize, value); }
 317
 318         uint32_t                umbrella_offset() const                         INLINE { return E::get32(fields.umbrella.offset); }
 319         void                    set_umbrella_offset(uint32_t value)     INLINE { E::set32(fields.umbrella.offset, value);  }
 320
 321         const char*             umbrella() const                                        INLINE { return (const char*)&fields + umbrella_offset(); }
 322         void                    set_umbrella_offset()                           INLINE { set_umbrella_offset(sizeof(fields)); }
 323
 324         typedef typename P::E           E;
 325 private:
 326         sub_framework_command   fields;
 327 };
 328
 329
 330 //
 331 // mach-o sub_client load command
 332 //
 333 template <typename P>
 334 class macho_sub_client_command {
 335 public:
 336         uint32_t                cmd() const                                                     INLINE { return E::get32(fields.cmd); }
 337         void                    set_cmd(uint32_t value)                         INLINE { E::set32(fields.cmd, value); }
 338
 339         uint32_t                cmdsize() const                                         INLINE { return E::get32(fields.cmdsize); }
 340         void                    set_cmdsize(uint32_t value)                     INLINE { E::set32(fields.cmdsize, value); }
 341
 342         uint32_t                client_offset() const                           INLINE { return E::get32(fields.client.offset); }
 343         void                    set_client_offset(uint32_t value)       INLINE { E::set32(fields.client.offset, value);  }
 344
 345         const char*             client() const                                          INLINE { return (const char*)&fields + client_offset(); }
 346         void                    set_client_offset()                                     INLINE { set_client_offset(sizeof(fields)); }
 347
 348         typedef typename P::E           E;
 349 private:
 350         sub_client_command      fields;
 351 };
 352
 353
 354 //
 355 // mach-o sub_umbrella load command
 356 //
 357 template <typename P>
 358 class macho_sub_umbrella_command {
 359 public:
 360         uint32_t                cmd() const                                                             INLINE { return E::get32(fields.cmd); }
 361         void                    set_cmd(uint32_t value)                                 INLINE { E::set32(fields.cmd, value); }
 362
 363         uint32_t                cmdsize() const                                                 INLINE { return E::get32(fields.cmdsize); }
 364         void                    set_cmdsize(uint32_t value)                             INLINE { E::set32(fields.cmdsize, value); }
 365
 366         uint32_t                sub_umbrella_offset() const                             INLINE { return E::get32(fields.sub_umbrella.offset); }
 367         void                    set_sub_umbrella_offset(uint32_t value) INLINE { E::set32(fields.sub_umbrella.offset, value);  }
 368
 369         const char*             sub_umbrella() const                                    INLINE { return (const char*)&fields + sub_umbrella_offset(); }
 370         void                    set_sub_umbrella_offset()                               INLINE { set_sub_umbrella_offset(sizeof(fields)); }
 371
 372         typedef typename P::E           E;
 373 private:
 374         sub_umbrella_command    fields;
 375 };
 376
 377
 378 //
 379 // mach-o sub_library load command
 380 //
 381 template <typename P>
 382 class macho_sub_library_command {
 383 public:
 384         uint32_t                cmd() const                                                             INLINE { return E::get32(fields.cmd); }
 385         void                    set_cmd(uint32_t value)                                 INLINE { E::set32(fields.cmd, value); }
 386
 387         uint32_t                cmdsize() const                                                 INLINE { return E::get32(fields.cmdsize); }
 388         void                    set_cmdsize(uint32_t value)                             INLINE { E::set32(fields.cmdsize, value); }
 389
 390         uint32_t                sub_library_offset() const                              INLINE { return E::get32(fields.sub_library.offset); }
 391         void                    set_sub_library_offset(uint32_t value)  INLINE { E::set32(fields.sub_library.offset, value);  }
 392
 393         const char*             sub_library() const                                             INLINE { return (const char*)&fields + sub_library_offset(); }
 394         void                    set_sub_library_offset()                                INLINE { set_sub_library_offset(sizeof(fields)); }
 395
 396         typedef typename P::E           E;
 397 private:
 398         sub_library_command     fields;
 399 };
 400
 401
 402 //
 403 // mach-o uuid load command
 404 //
 405 template <typename P>
 406 class macho_uuid_command {
 407 public:
 408         uint32_t                cmd() const                                                             INLINE { return E::get32(fields.cmd); }
 409         void                    set_cmd(uint32_t value)                                 INLINE { E::set32(fields.cmd, value); }
 410
 411         uint32_t                cmdsize() const                                                 INLINE { return E::get32(fields.cmdsize); }
 412         void                    set_cmdsize(uint32_t value)                             INLINE { E::set32(fields.cmdsize, value); }
 413
 414         const uint8_t*  uuid() const                                                    INLINE { return fields.uuid; }
 415         void                    set_uuid(uint8_t value[16])                             INLINE { memcpy(&fields.uuid, value, 16); }
 416
 417         typedef typename P::E           E;
 418 private:
 419         uuid_command    fields;
 420 };
 421
 422
 423 //
 424 // mach-o routines load command
 425 //
 426 template <typename P> struct macho_routines_content {};
 427 template <> struct macho_routines_content<Pointer32<BigEndian> >    { routines_command          fields; enum { CMD = LC_ROUTINES        }; };
 428 template <> struct macho_routines_content<Pointer64<BigEndian> >        { routines_command_64   fields; enum { CMD = LC_ROUTINES_64     }; };
 429 template <> struct macho_routines_content<Pointer32<LittleEndian> > { routines_command          fields; enum { CMD = LC_ROUTINES        }; };
 430 template <> struct macho_routines_content<Pointer64<LittleEndian> > { routines_command_64       fields; enum { CMD = LC_ROUTINES_64     }; };
 431
 432 template <typename P>
 433 class macho_routines_command {
 434 public:
 435         uint32_t                cmd() const                                                     INLINE { return E::get32(routines.fields.cmd); }
 436         void                    set_cmd(uint32_t value)                         INLINE { E::set32(routines.fields.cmd, value); }
 437
 438         uint32_t                cmdsize() const                                         INLINE { return E::get32(routines.fields.cmdsize); }
 439         void                    set_cmdsize(uint32_t value)                     INLINE { E::set32(routines.fields.cmdsize, value); }
 440
 441         uint64_t                init_address() const                            INLINE { return P::getP(routines.fields.init_address); }
 442         void                    set_init_address(uint64_t value)        INLINE { P::setP(routines.fields.init_address, value); }
 443
 444         uint64_t                init_module() const                                     INLINE { return P::getP(routines.fields.init_module); }
 445         void                    set_init_module(uint64_t value)         INLINE { P::setP(routines.fields.init_module, value); }
 446
 447         uint64_t                reserved1() const                                       INLINE { return P::getP(routines.fields.reserved1); }
 448         void                    set_reserved1(uint64_t value)           INLINE { P::setP(routines.fields.reserved1, value); }
 449
 450         uint64_t                reserved2() const                                       INLINE { return P::getP(routines.fields.reserved2); }
 451         void                    set_reserved2(uint64_t value)           INLINE { P::setP(routines.fields.reserved2, value); }
 452
 453         uint64_t                reserved3() const                                       INLINE { return P::getP(routines.fields.reserved3); }
 454         void                    set_reserved3(uint64_t value)           INLINE { P::setP(routines.fields.reserved3, value); }
 455
 456         uint64_t                reserved4() const                                       INLINE { return P::getP(routines.fields.reserved4); }
 457         void                    set_reserved4(uint64_t value)           INLINE { P::setP(routines.fields.reserved4, value); }
 458
 459         uint64_t                reserved5() const                                       INLINE { return P::getP(routines.fields.reserved5); }
 460         void                    set_reserved5(uint64_t value)           INLINE { P::setP(routines.fields.reserved5, value); }
 461
 462         uint64_t                reserved6() const                                       INLINE { return P::getP(routines.fields.reserved6); }
 463         void                    set_reserved6(uint64_t value)           INLINE { P::setP(routines.fields.reserved6, value); }
 464
 465         typedef typename P::E           E;
 466         enum {
 467                 CMD = macho_routines_content<P>::CMD
 468         };
 469 private:
 470         macho_routines_content<P>       routines;
 471 };
 472
 473
 474 //
 475 // mach-o symbol table load command
 476 //
 477 template <typename P>
 478 class macho_symtab_command {
 479 public:
 480         uint32_t                cmd() const                                     INLINE { return E::get32(fields.cmd); }
 481         void                    set_cmd(uint32_t value)         INLINE { E::set32(fields.cmd, value); }
 482
 483         uint32_t                cmdsize() const                         INLINE { return E::get32(fields.cmdsize); }
 484         void                    set_cmdsize(uint32_t value)     INLINE { E::set32(fields.cmdsize, value); }
 485
 486         uint32_t                symoff() const                          INLINE { return E::get32(fields.symoff); }
 487         void                    set_symoff(uint32_t value)      INLINE { E::set32(fields.symoff, value);  }
 488
 489         uint32_t                nsyms() const                           INLINE { return E::get32(fields.nsyms); }
 490         void                    set_nsyms(uint32_t value)       INLINE { E::set32(fields.nsyms, value);  }
 491
 492         uint32_t                stroff() const                          INLINE { return E::get32(fields.stroff); }
 493         void                    set_stroff(uint32_t value)      INLINE { E::set32(fields.stroff, value);  }
 494
 495         uint32_t                strsize() const                         INLINE { return E::get32(fields.strsize); }
 496         void                    set_strsize(uint32_t value)     INLINE { E::set32(fields.strsize, value);  }
 497
 498
 499         typedef typename P::E           E;
 500 private:
 501         symtab_command  fields;
 502 };
 503
 504
 505 //
 506 // mach-o dynamic symbol table load command
 507 //
 508 template <typename P>
 509 class macho_dysymtab_command {
 510 public:
 511         uint32_t                cmd() const                                                     INLINE { return E::get32(fields.cmd); }
 512         void                    set_cmd(uint32_t value)                         INLINE { E::set32(fields.cmd, value); }
 513
 514         uint32_t                cmdsize() const                                         INLINE { return E::get32(fields.cmdsize); }
 515         void                    set_cmdsize(uint32_t value)                     INLINE { E::set32(fields.cmdsize, value); }
 516
 517         uint32_t                ilocalsym() const                                       INLINE { return E::get32(fields.ilocalsym); }
 518         void                    set_ilocalsym(uint32_t value)           INLINE { E::set32(fields.ilocalsym, value);  }
 519
 520         uint32_t                nlocalsym() const                                       INLINE { return E::get32(fields.nlocalsym); }
 521         void                    set_nlocalsym(uint32_t value)           INLINE { E::set32(fields.nlocalsym, value);  }
 522
 523         uint32_t                iextdefsym() const                                      INLINE { return E::get32(fields.iextdefsym); }
 524         void                    set_iextdefsym(uint32_t value)          INLINE { E::set32(fields.iextdefsym, value);  }
 525
 526         uint32_t                nextdefsym() const                                      INLINE { return E::get32(fields.nextdefsym); }
 527         void                    set_nextdefsym(uint32_t value)          INLINE { E::set32(fields.nextdefsym, value);  }
 528
 529         uint32_t                iundefsym() const                                       INLINE { return E::get32(fields.iundefsym); }
 530         void                    set_iundefsym(uint32_t value)           INLINE { E::set32(fields.iundefsym, value);  }
 531
 532         uint32_t                nundefsym() const                                       INLINE { return E::get32(fields.nundefsym); }
 533         void                    set_nundefsym(uint32_t value)           INLINE { E::set32(fields.nundefsym, value);  }
 534
 535         uint32_t                tocoff() const                                          INLINE { return E::get32(fields.tocoff); }
 536         void                    set_tocoff(uint32_t value)                      INLINE { E::set32(fields.tocoff, value);  }
 537
 538         uint32_t                ntoc() const                                            INLINE { return E::get32(fields.ntoc); }
 539         void                    set_ntoc(uint32_t value)                        INLINE { E::set32(fields.ntoc, value);  }
 540
 541         uint32_t                modtaboff() const                                       INLINE { return E::get32(fields.modtaboff); }
 542         void                    set_modtaboff(uint32_t value)           INLINE { E::set32(fields.modtaboff, value);  }
 543
 544         uint32_t                nmodtab() const                                         INLINE { return E::get32(fields.nmodtab); }
 545         void                    set_nmodtab(uint32_t value)                     INLINE { E::set32(fields.nmodtab, value);  }
 546
 547         uint32_t                extrefsymoff() const                            INLINE { return E::get32(fields.extrefsymoff); }
 548         void                    set_extrefsymoff(uint32_t value)        INLINE { E::set32(fields.extrefsymoff, value);  }
 549
 550         uint32_t                nextrefsyms() const                                     INLINE { return E::get32(fields.nextrefsyms); }
 551         void                    set_nextrefsyms(uint32_t value)         INLINE { E::set32(fields.nextrefsyms, value);  }
 552
 553         uint32_t                indirectsymoff() const                          INLINE { return E::get32(fields.indirectsymoff); }
 554         void                    set_indirectsymoff(uint32_t value)      INLINE { E::set32(fields.indirectsymoff, value);  }
 555
 556         uint32_t                nindirectsyms() const                           INLINE { return E::get32(fields.nindirectsyms); }
 557         void                    set_nindirectsyms(uint32_t value)       INLINE { E::set32(fields.nindirectsyms, value);  }
 558
 559         uint32_t                extreloff() const                                       INLINE { return E::get32(fields.extreloff); }
 560         void                    set_extreloff(uint32_t value)           INLINE { E::set32(fields.extreloff, value);  }
 561
 562         uint32_t                nextrel() const                                         INLINE { return E::get32(fields.nextrel); }
 563         void                    set_nextrel(uint32_t value)                     INLINE { E::set32(fields.nextrel, value);  }
 564
 565         uint32_t                locreloff() const                                       INLINE { return E::get32(fields.locreloff); }
 566         void                    set_locreloff(uint32_t value)           INLINE { E::set32(fields.locreloff, value);  }
 567
 568         uint32_t                nlocrel() const                                         INLINE { return E::get32(fields.nlocrel); }
 569         void                    set_nlocrel(uint32_t value)                     INLINE { E::set32(fields.nlocrel, value);  }
 570
 571         typedef typename P::E           E;
 572 private:
 573         dysymtab_command        fields;
 574 };
 575
 576
 577 //
 578 // mach-o two-level hints load command
 579 //
 580 template <typename P>
 581 class macho_twolevel_hints_command {
 582 public:
 583         uint32_t                cmd() const                                     INLINE { return E::get32(fields.cmd); }
 584         void                    set_cmd(uint32_t value)         INLINE { E::set32(fields.cmd, value); }
 585
 586         uint32_t                cmdsize() const                         INLINE { return E::get32(fields.cmdsize); }
 587         void                    set_cmdsize(uint32_t value)     INLINE { E::set32(fields.cmdsize, value); }
 588
 589         uint32_t                offset() const                          INLINE { return E::get32(fields.offset); }
 590         void                    set_offset(uint32_t value)      INLINE { E::set32(fields.offset, value);  }
 591
 592         uint32_t                nhints() const                          INLINE { return E::get32(fields.nhints); }
 593         void                    set_nhints(uint32_t value)      INLINE { E::set32(fields.nhints, value);  }
 594
 595         typedef typename P::E           E;
 596 private:
 597         twolevel_hints_command  fields;
 598 };
 599
 600
 601 //
 602 // mach-o threads load command
 603 //
 604 template <typename P>
 605 class macho_thread_command {
 606 public:
 607         uint32_t                cmd() const                                                                                     INLINE { return E::get32(fields.cmd); }
 608         void                    set_cmd(uint32_t value)                                                         INLINE { E::set32(fields.cmd, value); }
 609
 610         uint32_t                cmdsize() const                                                                         INLINE { return E::get32(fields.cmdsize); }
 611         void                    set_cmdsize(uint32_t value)                                                     INLINE { E::set32(fields.cmdsize, value); }
 612
 613         uint32_t                flavor() const                                                                          INLINE { return E::get32(fields_flavor); }
 614         void                    set_flavor(uint32_t value)                                                      INLINE { E::set32(fields_flavor, value);  }
 615
 616         uint32_t                count() const                                                                           INLINE { return E::get32(fields_count); }
 617         void                    set_count(uint32_t value)                                                       INLINE { E::set32(fields_count, value);  }
 618
 619         uint64_t                thread_register(uint32_t index) const                           INLINE { return P::getP(thread_registers[index]); }
 620         void                    set_thread_register(uint32_t index, uint64_t value)     INLINE { P::setP(thread_registers[index], value); }
 621
 622         typedef typename P::E           E;
 623         typedef typename P::uint_t      pint_t;
 624 private:
 625         struct thread_command   fields;
 626         uint32_t                                fields_flavor;
 627         uint32_t                                fields_count;
 628         pint_t                                  thread_registers[1];
 629 };
 630
 631
 632 //
 633 // mach-o misc data
 634 //
 635 template <typename P>
 636 class macho_linkedit_data_command {
 637 public:
 638         uint32_t                cmd() const                                     INLINE { return E::get32(fields.cmd); }
 639         void                    set_cmd(uint32_t value)         INLINE { E::set32(fields.cmd, value); }
 640
 641         uint32_t                cmdsize() const                         INLINE { return E::get32(fields.cmdsize); }
 642         void                    set_cmdsize(uint32_t value)     INLINE { E::set32(fields.cmdsize, value); }
 643
 644         uint32_t                dataoff() const                         INLINE { return E::get32(fields.dataoff); }
 645         void                    set_dataoff(uint32_t value)     INLINE { E::set32(fields.dataoff, value);  }
 646
 647         uint32_t                datasize() const                        INLINE { return E::get32(fields.datasize); }
 648         void                    set_datasize(uint32_t value)INLINE { E::set32(fields.datasize, value);  }
 649
 650
 651         typedef typename P::E           E;
 652 private:
 653         linkedit_data_command   fields;
 654 };
 655
 656
 657 //
 658 // mach-o symbol table entry
 659 //
 660 template <typename P> struct macho_nlist_content {};
 661 template <> struct macho_nlist_content<Pointer32<BigEndian> >    { struct nlist         fields; };
 662 template <> struct macho_nlist_content<Pointer64<BigEndian> >    { struct nlist_64      fields; };
 663 template <> struct macho_nlist_content<Pointer32<LittleEndian> > { struct nlist         fields; };
 664 template <> struct macho_nlist_content<Pointer64<LittleEndian> > { struct nlist_64      fields; };
 665
 666 template <typename P>
 667 class macho_nlist {
 668 public:
 669         uint32_t                n_strx() const                                  INLINE { return E::get32(entry.fields.n_un.n_strx); }
 670         void                    set_n_strx(uint32_t value)              INLINE { E::set32((uint32_t&)entry.fields.n_un.n_strx, value); }
 671
 672         uint8_t                 n_type() const                                  INLINE { return entry.fields.n_type; }
 673         void                    set_n_type(uint8_t value)               INLINE { entry.fields.n_type = value; }
 674
 675         uint8_t                 n_sect() const                                  INLINE { return entry.fields.n_sect; }
 676         void                    set_n_sect(uint8_t value)               INLINE { entry.fields.n_sect = value; }
 677
 678         uint16_t                n_desc() const                                  INLINE { return E::get16(entry.fields.n_desc); }
 679         void                    set_n_desc(uint16_t value)              INLINE { E::set16((uint16_t&)entry.fields.n_desc, value); }
 680
 681         uint64_t                n_value() const                                 INLINE { return P::getP(entry.fields.n_value); }
 682         void                    set_n_value(uint64_t value)             INLINE { P::setP(entry.fields.n_value, value); }
 683
 684         typedef typename P::E           E;
 685 private:
 686         macho_nlist_content<P>  entry;
 687 };
 688
 689
 690
 691 //
 692 // mach-o relocation info
 693 //
 694 template <typename P>
 695 class macho_relocation_info {
 696 public:
 697         uint32_t                r_address() const                               INLINE { return E::get32(address); }
 698         void                    set_r_address(uint32_t value)   INLINE { E::set32(address, value); }
 699
 700         uint32_t                r_symbolnum() const                             INLINE { return E::getBits(other, 0, 24); }
 701         void                    set_r_symbolnum(uint32_t value) INLINE { E::setBits(other, value, 0, 24); }
 702
 703         bool                    r_pcrel() const                                 INLINE { return E::getBits(other, 24, 1); }
 704         void                    set_r_pcrel(bool value)                 INLINE { E::setBits(other, value, 24, 1); }
 705
 706         uint8_t                 r_length() const                                INLINE { return E::getBits(other, 25, 2); }
 707         void                    set_r_length(uint8_t value)             INLINE { E::setBits(other, value, 25, 2); }
 708
 709         bool                    r_extern() const                                INLINE { return E::getBits(other, 27, 1); }
 710         void                    set_r_extern(bool value)                INLINE { E::setBits(other, value, 27, 1); }
 711
 712         uint8_t                 r_type() const                                  INLINE { return E::getBits(other, 28, 4); }
 713         void                    set_r_type(uint8_t value)               INLINE { E::setBits(other, value, 28, 4); }
 714
 715         void                    set_r_length()                                  INLINE { set_r_length((sizeof(typename P::uint_t)==8) ? 3 : 2); }
 716
 717         typedef typename P::E           E;
 718 private:
 719         uint32_t                address;
 720         uint32_t                other;
 721 };
 722
 723
 724 //
 725 // mach-o scattered relocation info
 726 // The bit fields are always in big-endian order (see mach-o/reloc.h)
 727 //
 728 template <typename P>
 729 class macho_scattered_relocation_info {
 730 public:
 731         bool                    r_scattered() const                     INLINE { return BigEndian::getBitsRaw(E::get32(other), 0, 1); }
 732         void                    set_r_scattered(bool x)         INLINE { uint32_t temp = E::get32(other); BigEndian::setBitsRaw(temp, x, 0, 1);  E::set32(other, temp); }
 733
 734         bool                    r_pcrel() const                         INLINE { return BigEndian::getBitsRaw(E::get32(other), 1, 1); }
 735         void                    set_r_pcrel(bool x)                     INLINE { uint32_t temp = E::get32(other); BigEndian::setBitsRaw(temp, x, 1, 1);  E::set32(other, temp); }
 736
 737         uint8_t                 r_length() const                        INLINE { return BigEndian::getBitsRaw(E::get32(other), 2, 2); }
 738         void                    set_r_length(uint8_t x)         INLINE { uint32_t temp = E::get32(other); BigEndian::setBitsRaw(temp, x, 2, 2);  E::set32(other, temp); }
 739
 740         uint8_t                 r_type() const                          INLINE { return BigEndian::getBitsRaw(E::get32(other), 4, 4); }
 741         void                    set_r_type(uint8_t x)           INLINE { uint32_t temp = E::get32(other); BigEndian::setBitsRaw(temp, x, 4, 4);  E::set32(other, temp); }
 742
 743         uint32_t                r_address() const                       INLINE { return BigEndian::getBitsRaw(E::get32(other), 8, 24); }
 744         void                    set_r_address(uint32_t x)       INLINE { uint32_t temp = E::get32(other); BigEndian::setBitsRaw(temp, x, 8, 24);  E::set32(other, temp); }
 745
 746         uint32_t                r_value() const                         INLINE { return E::get32(value); }
 747         void                    set_r_value(uint32_t x)         INLINE { E::set32(value, x); }
 748
 749         uint32_t                r_other() const                         INLINE { return other; }
 750
 751         typedef typename P::E           E;
 752 private:
 753         uint32_t                other;
 754         uint32_t                value;
 755 };
 756
 757
 758 //
 759 // mach-o file header
 760 //
 761 template <typename P> struct macho_header_content {};
 762 template <> struct macho_header_content<Pointer32<BigEndian> >    { mach_header         fields; };
 763 template <> struct macho_header_content<Pointer64<BigEndian> >    { mach_header_64      fields; };
 764 template <> struct macho_header_content<Pointer32<LittleEndian> > { mach_header         fields; };
 765 template <> struct macho_header_content<Pointer64<LittleEndian> > { mach_header_64      fields; };
 766
 767 template <typename P>
 768 class macho_header {
 769 public:
 770         uint32_t                magic() const                                   INLINE { return E::get32(header.fields.magic); }
 771         void                    set_magic(uint32_t value)               INLINE { E::set32(header.fields.magic, value); }
 772
 773         uint32_t                cputype() const                                 INLINE { return E::get32(header.fields.cputype); }
 774         void                    set_cputype(uint32_t value)             INLINE { E::set32((uint32_t&)header.fields.cputype, value); }
 775
 776         uint32_t                cpusubtype() const                              INLINE { return E::get32(header.fields.cpusubtype); }
 777         void                    set_cpusubtype(uint32_t value)  INLINE { E::set32((uint32_t&)header.fields.cpusubtype, value); }
 778
 779         uint32_t                filetype() const                                INLINE { return E::get32(header.fields.filetype); }
 780         void                    set_filetype(uint32_t value)    INLINE { E::set32(header.fields.filetype, value); }
 781
 782         uint32_t                ncmds() const                                   INLINE { return E::get32(header.fields.ncmds); }
 783         void                    set_ncmds(uint32_t value)               INLINE { E::set32(header.fields.ncmds, value); }
 784
 785         uint32_t                sizeofcmds() const                              INLINE { return E::get32(header.fields.sizeofcmds); }
 786         void                    set_sizeofcmds(uint32_t value)  INLINE { E::set32(header.fields.sizeofcmds, value); }
 787
 788         uint32_t                flags() const                                   INLINE { return E::get32(header.fields.flags); }
 789         void                    set_flags(uint32_t value)               INLINE { E::set32(header.fields.flags, value); }
 790
 791         uint32_t                reserved() const                                INLINE { return E::get32(header.fields.reserved); }
 792         void                    set_reserved(uint32_t value)    INLINE { E::set32(header.fields.reserved, value); }
 793
 794     const macho_segment_command<P>* getSegment(const char *segname) const
 795     {
 796         const macho_load_command<P>* cmds = (macho_load_command<P>*)((uint8_t*)this + sizeof(macho_header<P>));
 797         uint32_t cmd_count = this->ncmds();
 798         const macho_load_command<P>* cmd = cmds;
 799         for (uint32_t i = 0; i < cmd_count; ++i) {
 800             if ( cmd->cmd() == macho_segment_command<P>::CMD ) {
 801                 const macho_segment_command<P>* segcmd = (macho_segment_command<P>*)cmd;
 802                 if (0 == strncmp(segname, segcmd->segname(), 16)) {
 803                     return segcmd;
 804                 }
 805             }
 806             cmd = (macho_load_command<P>*)(((uint8_t*)cmd)+cmd->cmdsize());
 807         }
 808         return NULL;
 809     }
 810
 811     const macho_section<P>* getSection(const char *segname, const char *sectname) const
 812     {
 813        const  macho_segment_command<P>* segcmd = getSegment(segname);
 814         if (!segcmd) return NULL;
 815
 816         const macho_section<P>* sectcmd = (macho_section<P>*)(segcmd+1);
 817         uint32_t section_count = segcmd->nsects();
 818         for (uint32_t j = 0; j < section_count; ++j) {
 819             if (0 == ::strncmp(sectcmd[j].sectname(), sectname, 16)) {
 820                 return sectcmd+j;
 821             }
 822         }
 823
 824         return NULL;
 825     }
 826
 827     const macho_load_command<P>* getLoadCommand(int query) const
 828     {
 829         const macho_load_command<P>* cmds = (macho_load_command<P>*)((uint8_t*)this + sizeof(macho_header<P>));
 830         uint32_t cmd_count = this->ncmds();
 831         const macho_load_command<P>* cmd = cmds;
 832         for (uint32_t i = 0; i < cmd_count; ++i) {
 833             if ( cmd->cmd() == query ) {
 834                 return cmd;
 835             }
 836             cmd = (macho_load_command<P>*)(((uint8_t*)cmd)+cmd->cmdsize());
 837         }
 838         return NULL;
 839     }
 840
 841         typedef typename P::E           E;
 842 private:
 843         macho_header_content<P> header;
 844 };
 845
 846
 847
 848 //
 849 // compressed dyld info load command
 850 //
 851 template <typename P>
 852 class macho_dyld_info_command {
 853 public:
 854         uint32_t                cmd() const                                     INLINE { return E::get32(fields.cmd); }
 855         void                    set_cmd(uint32_t value)         INLINE { E::set32(fields.cmd, value); }
 856
 857         uint32_t                cmdsize() const                         INLINE { return E::get32(fields.cmdsize); }
 858         void                    set_cmdsize(uint32_t value)     INLINE { E::set32(fields.cmdsize, value); }
 859
 860         uint32_t                rebase_off() const                              INLINE { return E::get32(fields.rebase_off); }
 861         void                    set_rebase_off(uint32_t value)  INLINE { E::set32(fields.rebase_off, value);  }
 862
 863         uint32_t                rebase_size() const                             INLINE { return E::get32(fields.rebase_size); }
 864         void                    set_rebase_size(uint32_t value) INLINE { E::set32(fields.rebase_size, value);  }
 865
 866         uint32_t                bind_off() const                                INLINE { return E::get32(fields.bind_off); }
 867         void                    set_bind_off(uint32_t value)    INLINE { E::set32(fields.bind_off, value);  }
 868
 869         uint32_t                bind_size() const                               INLINE { return E::get32(fields.bind_size); }
 870         void                    set_bind_size(uint32_t value)   INLINE { E::set32(fields.bind_size, value);  }
 871
 872         uint32_t                weak_bind_off() const                           INLINE { return E::get32(fields.weak_bind_off); }
 873         void                    set_weak_bind_off(uint32_t value)       INLINE { E::set32(fields.weak_bind_off, value);  }
 874
 875         uint32_t                weak_bind_size() const                          INLINE { return E::get32(fields.weak_bind_size); }
 876         void                    set_weak_bind_size(uint32_t value)      INLINE { E::set32(fields.weak_bind_size, value);  }
 877
 878         uint32_t                lazy_bind_off() const                           INLINE { return E::get32(fields.lazy_bind_off); }
 879         void                    set_lazy_bind_off(uint32_t value)       INLINE { E::set32(fields.lazy_bind_off, value);  }
 880
 881         uint32_t                lazy_bind_size() const                          INLINE { return E::get32(fields.lazy_bind_size); }
 882         void                    set_lazy_bind_size(uint32_t value)      INLINE { E::set32(fields.lazy_bind_size, value);  }
 883
 884         uint32_t                export_off() const                              INLINE { return E::get32(fields.export_off); }
 885         void                    set_export_off(uint32_t value)  INLINE { E::set32(fields.export_off, value);  }
 886
 887         uint32_t                export_size() const                             INLINE { return E::get32(fields.export_size); }
 888         void                    set_export_size(uint32_t value) INLINE { E::set32(fields.export_size, value);  }
 889
 890
 891         typedef typename P::E           E;
 892 private:
 893         dyld_info_command       fields;
 894 };
 895
 896 #ifndef NO_ULEB
 897 inline uint64_t read_uleb128(const uint8_t*& p, const uint8_t* end) {
 898         uint64_t result = 0;
 899         int              bit = 0;
 900         do {
 901                 if (p == end)
 902                         throw "malformed uleb128 extends beyond trie";
 903
 904                 uint64_t slice = *p & 0x7f;
 905
 906                 if (bit >= 64 || slice << bit >> bit != slice)
 907                         throw "uleb128 too big for 64-bits";
 908                 else {
 909                         result |= (slice << bit);
 910                         bit += 7;
 911                 }
 912         }
 913         while (*p++ & 0x80);
 914         return result;
 915 }
 916
 917
 918 static int64_t read_sleb128(const uint8_t*& p, const uint8_t* end)
 919 {
 920         int64_t result = 0;
 921         int bit = 0;
 922         uint8_t byte;
 923         do {
 924                 if (p == end)
 925                         throw "malformed sleb128";
 926                 byte = *p++;
 927                 result |= ((byte & 0x7f) << bit);
 928                 bit += 7;
 929         } while (byte & 0x80);
 930         // sign extend negative numbers
 931         if ( (byte & 0x40) != 0 )
 932                 result |= (-1LL) << bit;
 933         return result;
 934 }
 935
 936 #endif
 937
 938
 939 #endif  // __MACH_O_FILE_ABSTRACTION__
 940
 941