libkern/kxld/kxld_sym.h

   1 /*
   2  * Copyright (c) 2008 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 #ifndef _KXLD_SYMBOL_H_
  29 #define _KXLD_SYMBOL_H_
  30
  31 #include <mach/machine.h>
  32 #include <sys/types.h>
  33 #if KERNEL
  34     #include <libkern/kxld_types.h>
  35 #else
  36     #include "kxld_types.h"
  37 #endif
  38
  39 struct kxld_sect;
  40 struct nlist;
  41 struct nlist_64;
  42 typedef struct kxld_sym KXLDSym;
  43 typedef boolean_t (*KXLDSymPredicateTest)(const KXLDSym *sym);
  44
  45 struct kxld_sym {
  46     char *name;                       // The symbol's name
  47     char *alias;                      // The indirect symbol's alias name
  48     kxld_addr_t base_addr;            // The symbol's base address
  49     kxld_addr_t link_addr;            // The relocated address
  50     kxld_addr_t got_addr;             // The address of this symbol's GOT entry
  51     uint8_t type;
  52     uint8_t sectnum;                  // The symbol's section number
  53     uint8_t relocated_sectnum;
  54     uint16_t desc;
  55     struct {
  56         u_int is_absolute:1,          // Set for absolute symbols
  57         is_section:1,                 // Set for section symbols
  58         is_undefined:1,               // Set for undefined symbols
  59         is_indirect:1,                // Set for indirect symbols
  60         is_common:1,                  // Set for common symbols
  61         is_external:1,                // Set for external symbols
  62         is_stab:1,                    // Set for stab symbols
  63         is_weak:1,                    // Set for weak definition symbols
  64         is_resolved:1,                // For symbols that have been resolved
  65                                       // externally and should not be exported
  66         is_obsolete:1,                // For symbols marked as obsolete
  67         is_replaced:1,                // Set for symbols replaced by patching
  68         is_got:1,                     // Has an entry in the GOT
  69         is_cxx:1,                     // Set for C++ symbols
  70         is_pure_virtual:1,            // Set for pure virtual symbols
  71         is_class_vtable:1,            // Set for vtable symbols of classes
  72         is_meta_vtable:1,             // Set for vtable symbols of MetaClasses
  73         is_padslot:1,                 // Set for pad slot symbols
  74         is_metaclass:1,               // Set for metaclass symbols
  75         is_super_metaclass_pointer:1, // Set for super metaclass pointer syms
  76         is_thumb:1;                   // Set for thumb symbols (ARM only)
  77     } predicates;
  78 };
  79
  80 /*******************************************************************************
  81 * Constructors and destructors
  82 *******************************************************************************/
  83
  84 #if KXLD_USER_OR_ILP32
  85 kern_return_t kxld_sym_init_from_macho32(KXLDSym *sym, char *strtab,
  86     const struct nlist *src) __attribute__((nonnull, visibility("hidden")));
  87 #endif
  88
  89 #if KXLD_USER_OR_LP64
  90 kern_return_t kxld_sym_init_from_macho64(KXLDSym *sym, char *strtab,
  91     const struct nlist_64 *src) __attribute__((nonnull, visibility("hidden")));
  92 #endif
  93
  94 void kxld_sym_init_absolute(KXLDSym *sym, char *name, kxld_addr_t link_addr)
  95     __attribute__((nonnull, visibility("hidden")));
  96
  97 void kxld_sym_deinit(KXLDSym *sym)
  98     __attribute__((nonnull, visibility("hidden")));
  99
 100 void kxld_sym_destroy(KXLDSym *sym)
 101     __attribute__((nonnull, visibility("hidden")));
 102
 103 /*******************************************************************************
 104 * Accessors
 105 *******************************************************************************/
 106
 107 boolean_t kxld_sym_is_absolute(const KXLDSym *sym)
 108     __attribute__((pure, nonnull, visibility("hidden")));
 109
 110 boolean_t kxld_sym_is_section(const KXLDSym *sym)
 111     __attribute__((pure, nonnull, visibility("hidden")));
 112
 113 boolean_t kxld_sym_is_defined(const KXLDSym *sym)
 114     __attribute__((pure, nonnull, visibility("hidden")));
 115
 116 boolean_t kxld_sym_is_defined_locally(const KXLDSym *sym)
 117     __attribute__((pure, nonnull, visibility("hidden")));
 118
 119 boolean_t kxld_sym_is_external(const KXLDSym *sym)
 120     __attribute__((pure, nonnull, visibility("hidden")));
 121
 122 boolean_t kxld_sym_is_exported(const KXLDSym *sym)
 123     __attribute__((pure, nonnull, visibility("hidden")));
 124
 125 boolean_t kxld_sym_is_undefined(const KXLDSym *sym)
 126     __attribute__((pure, nonnull, visibility("hidden")));
 127
 128 boolean_t kxld_sym_is_indirect(const KXLDSym *sym)
 129     __attribute__((pure, nonnull, visibility("hidden")));
 130
 131 /* We don't wrap this in KXLD_USER_OR_COMMON because even though common symbols
 132  * aren't always supported, we always need to be able to detect them.
 133  */
 134 boolean_t kxld_sym_is_common(const KXLDSym *sym)
 135     __attribute__((pure, nonnull, visibility("hidden")));
 136
 137 boolean_t kxld_sym_is_unresolved(const KXLDSym *sym)
 138     __attribute__((pure, nonnull, visibility("hidden")));
 139
 140 boolean_t kxld_sym_is_obsolete(const KXLDSym *sym)
 141     __attribute__((pure, nonnull, visibility("hidden")));
 142
 143 #if KXLD_USER_OR_GOT
 144 boolean_t kxld_sym_is_got(const KXLDSym *sym)
 145     __attribute__((pure, nonnull, visibility("hidden")));
 146 #endif /* KXLD_USER_OR_GOT */
 147
 148 boolean_t kxld_sym_is_stab(const KXLDSym *sym)
 149     __attribute__((pure, nonnull, visibility("hidden")));
 150
 151 boolean_t kxld_sym_is_weak(const KXLDSym *sym)
 152     __attribute__((pure, nonnull, visibility("hidden")));
 153
 154 boolean_t kxld_sym_is_cxx(const KXLDSym *sym)
 155     __attribute__((pure, nonnull, visibility("hidden")));
 156
 157 boolean_t kxld_sym_is_pure_virtual(const KXLDSym *sym)
 158     __attribute__((pure, nonnull, visibility("hidden")));
 159
 160 boolean_t kxld_sym_is_vtable(const KXLDSym *sym)
 161     __attribute__((pure, nonnull, visibility("hidden")));
 162
 163 boolean_t kxld_sym_is_class_vtable(const KXLDSym *sym)
 164     __attribute__((pure, nonnull, visibility("hidden")));
 165
 166 boolean_t kxld_sym_is_metaclass_vtable(const KXLDSym *sym)
 167     __attribute__((pure, nonnull, visibility("hidden")));
 168
 169 boolean_t kxld_sym_is_padslot(const KXLDSym *sym)
 170     __attribute__((pure, nonnull, visibility("hidden")));
 171
 172 boolean_t kxld_sym_is_metaclass(const KXLDSym *sym)
 173     __attribute__((pure, nonnull, visibility("hidden")));
 174
 175 boolean_t kxld_sym_is_super_metaclass_pointer(const KXLDSym *sym)
 176     __attribute__((pure, nonnull, visibility("hidden")));
 177
 178 boolean_t kxld_sym_name_is_padslot(const char *name)
 179     __attribute__((pure, nonnull, visibility("hidden")));
 180
 181 u_int kxld_sym_get_section_offset(const KXLDSym *sym,
 182     const struct kxld_sect *sect)
 183     __attribute__((pure, nonnull, visibility("hidden")));
 184
 185 #if KXLD_USER_OR_COMMON
 186 kxld_size_t kxld_sym_get_common_size(const KXLDSym *sym)
 187     __attribute__((pure, nonnull, visibility("hidden")));
 188
 189 u_int kxld_sym_get_common_align(const KXLDSym *sym)
 190     __attribute__((pure, nonnull, visibility("hidden")));
 191 #endif /* KXLD_USER_OR_COMMON */
 192
 193 kern_return_t kxld_sym_get_class_name_from_metaclass(const KXLDSym *sym,
 194     char class_name[], u_long class_name_len)
 195     __attribute__((nonnull, visibility("hidden")));
 196
 197 kern_return_t kxld_sym_get_class_name_from_super_metaclass_pointer(
 198     const KXLDSym *sym, char class_name[], u_long class_name_len)
 199     __attribute__((nonnull, visibility("hidden")));
 200
 201 kern_return_t kxld_sym_get_class_name_from_vtable(const KXLDSym *sym,
 202     char class_name[], u_long class_name_len)
 203     __attribute__((nonnull, visibility("hidden")));
 204
 205 kern_return_t kxld_sym_get_class_name_from_vtable_name(const char *vtable_name,
 206     char class_name[], u_long class_name_len)
 207     __attribute__((nonnull, visibility("hidden")));
 208
 209 kern_return_t kxld_sym_get_vtable_name_from_class_name(const char *class_name,
 210     char vtable_name[], u_long vtable_name_len)
 211     __attribute__((nonnull, visibility("hidden")));
 212
 213 kern_return_t kxld_sym_get_meta_vtable_name_from_class_name(const char *class_name,
 214     char meta_vtable_name[], u_long meta_vtable_name_len)
 215     __attribute__((nonnull, visibility("hidden")));
 216
 217 kern_return_t kxld_sym_get_final_sym_name_from_class_name(const char *class_name,
 218     char final_sym_name[], u_long final_sym_name_len)
 219     __attribute__((nonnull, visibility("hidden")));
 220
 221 u_long kxld_sym_get_function_prefix_from_class_name(const char *class_name,
 222     char function_prefix[], u_long function_prefix_len)
 223     __attribute__((nonnull, visibility("hidden")));
 224
 225 #if KXLD_USER_OR_ILP32
 226 kern_return_t kxld_sym_export_macho_32(const KXLDSym *sym, u_char *nl,
 227     char *strtab, u_long *stroff, u_long strsize, boolean_t is_link_state)
 228     __attribute__((nonnull, visibility("hidden")));
 229 #endif
 230
 231 #if KXLD_USER_OR_LP64
 232 kern_return_t kxld_sym_export_macho_64(const KXLDSym *sym, u_char *nl,
 233     char *strtab, u_long *stroff, u_long strsize, boolean_t is_link_state)
 234     __attribute__((nonnull, visibility("hidden")));
 235 #endif
 236
 237 /*******************************************************************************
 238 * Mutators
 239 *******************************************************************************/
 240
 241 void kxld_sym_relocate(KXLDSym *sym, const struct kxld_sect *sect)
 242     __attribute__((nonnull, visibility("hidden")));
 243
 244 #if KXLD_USER_OR_GOT
 245 void kxld_sym_set_got(KXLDSym *sym)
 246     __attribute__((nonnull, visibility("hidden")));
 247 #endif /* KXLD_USER_OR_GOT */
 248
 249 kern_return_t kxld_sym_resolve(KXLDSym *sym, const kxld_addr_t addr,
 250     boolean_t export_sym)
 251     __attribute__((nonnull, visibility("hidden")));
 252
 253 #if KXLD_USER_OR_COMMON
 254 kern_return_t kxld_sym_resolve_common(KXLDSym *sym, u_int sectnum,
 255     kxld_addr_t base_addr)
 256     __attribute__((nonnull, visibility("hidden")));
 257 #endif /* KXLD_USER_OR_COMMON */
 258
 259 void kxld_sym_delete(KXLDSym *sym)
 260     __attribute__((nonnull, visibility("hidden")));
 261
 262 void kxld_sym_patch(KXLDSym *sym)
 263     __attribute__((nonnull, visibility("hidden")));
 264
 265 void kxld_sym_mark_private(KXLDSym *sym)
 266     __attribute__((nonnull, visibility("hidden")));
 267
 268 #endif /* _KXLD_SYMBOL_H_ */
 269