1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2010 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #ifndef _LINK_H 27 #define _LINK_H 28 29 #include <sys/link.h> 30 31 #ifndef _ASM 32 #include <libelf.h> 33 #include <sys/types.h> 34 #include <dlfcn.h> 35 #endif 36 37 #ifdef __cplusplus 38 extern "C" { 39 #endif 40 41 #ifndef _ASM 42 /* 43 * ld support library calls 44 */ 45 #ifdef __STDC__ 46 extern uint_t ld_version(uint_t); 47 extern void ld_input_done(uint_t *); 48 49 extern void ld_start(const char *, const Elf32_Half, const char *); 50 extern void ld_atexit(int); 51 extern void ld_open(const char **, const char **, int *, int, Elf **, 52 Elf *, size_t, const Elf_Kind); 53 extern void ld_file(const char *, const Elf_Kind, int, Elf *); 54 extern void ld_input_section(const char *, Elf32_Shdr **, Elf32_Word, 55 Elf_Data *, Elf *, uint_t *); 56 extern void ld_section(const char *, Elf32_Shdr *, Elf32_Word, 57 Elf_Data *, Elf *); 58 59 #if defined(_LP64) || defined(_LONGLONG_TYPE) 60 extern void ld_start64(const char *, const Elf64_Half, const char *); 61 extern void ld_atexit64(int); 62 extern void ld_open64(const char **, const char **, int *, int, Elf **, 63 Elf *, size_t, const Elf_Kind); 64 extern void ld_file64(const char *, const Elf_Kind, int, Elf *); 65 extern void ld_input_section64(const char *, Elf64_Shdr **, Elf64_Word, 66 Elf_Data *, Elf *, uint_t *); 67 extern void ld_section64(const char *, Elf64_Shdr *, Elf64_Word, 68 Elf_Data *, Elf *); 69 70 #endif /* (defined(_LP64) || defined(_LONGLONG_TYPE) */ 71 #else 72 extern void ld_version(); 73 extern void ld_input_done(); 74 75 extern void ld_start(); 76 extern void ld_atexit(); 77 extern void ld_open(); 78 extern void ld_file(); 79 extern void ld_input_section(); 80 extern void ld_section(); 81 82 #if defined(_LP64) || defined(_LONGLONG_TYPE) 83 extern void ld_start64(); 84 extern void ld_atexit64(); 85 extern void ld_open64(); 86 extern void ld_file64(); 87 extern void ld_input_section64(); 88 extern void ld_section64(); 89 90 #endif /* (defined(_LP64) || defined(_LONGLONG_TYPE) */ 91 #endif /* __STDC__ */ 92 93 /* 94 * ld_version() version values. 95 */ 96 #define LD_SUP_VNONE 0 97 #define LD_SUP_VERSION1 1 98 #define LD_SUP_VERSION2 2 99 #define LD_SUP_VERSION3 3 100 #define LD_SUP_VCURRENT LD_SUP_VERSION3 101 102 /* 103 * Flags passed to ld support calls. 104 */ 105 #define LD_SUP_DERIVED 0x1 /* derived filename */ 106 #define LD_SUP_INHERITED 0x2 /* file inherited from .so DT_NEEDED */ 107 #define LD_SUP_EXTRACTED 0x4 /* file extracted from archive */ 108 #endif 109 110 /* 111 * Runtime link-map identifiers. 112 */ 113 #define LM_ID_BASE 0x00 114 #define LM_ID_LDSO 0x01 115 #define LM_ID_NUM 2 116 117 #define LM_ID_BRAND 0xfd /* brand emulation linkmap objs */ 118 #define LM_ID_NONE 0xfe /* no link map specified */ 119 #define LM_ID_NEWLM 0xff /* create a new link-map */ 120 121 /* 122 * Runtime Link-Edit Auditing. 123 */ 124 #define LAV_NONE 0 125 #define LAV_VERSION1 1 126 #define LAV_VERSION2 2 127 #define LAV_VERSION3 3 128 #define LAV_VERSION4 4 129 #define LAV_CURRENT LAV_VERSION4 130 #define LAV_NUM 5 131 132 /* 133 * Flags that can be or'd into the la_objopen() return code 134 */ 135 #define LA_FLG_BINDTO 0x0001 /* audit symbinds TO this object */ 136 #define LA_FLG_BINDFROM 0x0002 /* audit symbinding FROM this object */ 137 138 /* 139 * Flags that can be or'd into the 'flags' argument of la_symbind() 140 */ 141 #define LA_SYMB_NOPLTENTER 0x0001 /* disable pltenter for this symbol */ 142 #define LA_SYMB_NOPLTEXIT 0x0002 /* disable pltexit for this symbol */ 143 #define LA_SYMB_STRUCTCALL 0x0004 /* this function call passes a */ 144 /* structure as it's return code */ 145 #define LA_SYMB_DLSYM 0x0008 /* this symbol bindings is due to */ 146 /* a call to dlsym() */ 147 #define LA_SYMB_ALTVALUE 0x0010 /* alternate symbol binding returned */ 148 /* by la_symbind() */ 149 150 /* 151 * Flags that describe the object passed to la_objsearch() 152 */ 153 #define LA_SER_ORIG 0x001 /* original (needed) name */ 154 #define LA_SER_LIBPATH 0x002 /* LD_LIBRARY_PATH entry prepended */ 155 #define LA_SER_RUNPATH 0x004 /* runpath entry prepended */ 156 #define LA_SER_CONFIG 0x008 /* configuration entry prepended */ 157 #define LA_SER_DEFAULT 0x040 /* default path prepended */ 158 #define LA_SER_SECURE 0x080 /* default (secure) path prepended */ 159 160 #define LA_SER_MASK 0xfff /* mask of known flags */ 161 162 /* 163 * Flags that describe the la_activity() 164 */ 165 #define LA_ACT_CONSISTENT 0x00 /* add/deletion of objects complete */ 166 #define LA_ACT_ADD 0x01 /* objects being added */ 167 #define LA_ACT_DELETE 0x02 /* objects being deleted */ 168 169 170 #ifndef _KERNEL 171 #ifndef _ASM 172 173 #if defined(_LP64) 174 typedef long lagreg_t; 175 #else 176 typedef int lagreg_t; 177 #endif 178 179 struct _la_sparc_regs { 180 lagreg_t lr_rego0; 181 lagreg_t lr_rego1; 182 lagreg_t lr_rego2; 183 lagreg_t lr_rego3; 184 lagreg_t lr_rego4; 185 lagreg_t lr_rego5; 186 lagreg_t lr_rego6; 187 lagreg_t lr_rego7; 188 }; 189 190 #if defined(_LP64) 191 typedef struct _la_sparc_regs La_sparcv9_regs; 192 typedef struct { 193 lagreg_t lr_rsp; 194 lagreg_t lr_rbp; 195 lagreg_t lr_rdi; /* arg1 */ 196 lagreg_t lr_rsi; /* arg2 */ 197 lagreg_t lr_rdx; /* arg3 */ 198 lagreg_t lr_rcx; /* arg4 */ 199 lagreg_t lr_r8; /* arg5 */ 200 lagreg_t lr_r9; /* arg6 */ 201 } La_amd64_regs; 202 #else 203 typedef struct _la_sparc_regs La_sparcv8_regs; 204 typedef struct { 205 lagreg_t lr_esp; 206 lagreg_t lr_ebp; 207 } La_i86_regs; 208 #endif 209 210 #if !defined(_SYS_INT_TYPES_H) 211 #if defined(_LP64) || defined(_I32LPx) 212 typedef unsigned long uintptr_t; 213 #else 214 typedef unsigned int uintptr_t; 215 #endif 216 #endif 217 218 219 #ifdef __STDC__ 220 extern uint_t la_version(uint_t); 221 extern void la_activity(uintptr_t *, uint_t); 222 extern void la_preinit(uintptr_t *); 223 extern char *la_objsearch(const char *, uintptr_t *, uint_t); 224 extern uint_t la_objopen(Link_map *, Lmid_t, uintptr_t *); 225 extern uint_t la_objclose(uintptr_t *); 226 extern int la_objfilter(uintptr_t *, const char *, uintptr_t *, 227 uint_t); 228 #if defined(_LP64) 229 extern uintptr_t la_amd64_pltenter(Elf64_Sym *, uint_t, uintptr_t *, 230 uintptr_t *, La_amd64_regs *, uint_t *, 231 const char *); 232 extern uintptr_t la_symbind64(Elf64_Sym *, uint_t, uintptr_t *, 233 uintptr_t *, uint_t *, const char *); 234 extern uintptr_t la_sparcv9_pltenter(Elf64_Sym *, uint_t, uintptr_t *, 235 uintptr_t *, La_sparcv9_regs *, uint_t *, 236 const char *); 237 extern uintptr_t la_pltexit64(Elf64_Sym *, uint_t, uintptr_t *, 238 uintptr_t *, uintptr_t, const char *); 239 #else /* !defined(_LP64) */ 240 extern uintptr_t la_symbind32(Elf32_Sym *, uint_t, uintptr_t *, 241 uintptr_t *, uint_t *); 242 extern uintptr_t la_sparcv8_pltenter(Elf32_Sym *, uint_t, uintptr_t *, 243 uintptr_t *, La_sparcv8_regs *, uint_t *); 244 extern uintptr_t la_i86_pltenter(Elf32_Sym *, uint_t, uintptr_t *, 245 uintptr_t *, La_i86_regs *, uint_t *); 246 extern uintptr_t la_pltexit(Elf32_Sym *, uint_t, uintptr_t *, 247 uintptr_t *, uintptr_t); 248 #endif /* _LP64 */ 249 #else /* __STDC__ */ 250 extern uint_t la_version(); 251 extern void la_preinit(); 252 extern uint_t la_objopen(); 253 extern uint_t la_objclose(); 254 extern int la_objfilter(); 255 #if defined(_LP64) 256 extern uintptr_t la_sparcv9_pltenter(); 257 extern uintptr_t la_pltexit64(); 258 extern uintptr_t la_symbind64(); 259 #else /* _ILP32 */ 260 extern uintptr_t la_sparcv8_pltenter(); 261 extern uintptr_t la_i86_pltenter(); 262 extern uintptr_t la_pltexit(); 263 extern uintptr_t la_symbind32(); 264 #endif /* _LP64 */ 265 #endif /* __STDC__ */ 266 267 268 /* 269 * The ElfW() macro is a GNU/Linux feature, provided as support for 270 * the dl_phdr_info structure used by dl_phdr_iterate(), which also 271 * originated under Linux. Given an ELF data type, without the ElfXX_ 272 * prefix, it supplies the appropriate prefix (Elf32_ or Elf64_) for 273 * the ELFCLASS of the code being compiled. 274 * 275 * Note that ElfW() is not suitable in situations in which the ELFCLASS 276 * of the code being compiled does not match that of the objects that 277 * code is intended to operate on (e.g. a 32-bit link-editor building 278 * a 64-bit object). The macros defined in <sys/machelf.h> are 279 * recommended in such cases. 280 */ 281 #ifdef _LP64 282 #define ElfW(type) Elf64_ ## type 283 #else 284 #define ElfW(type) Elf32_ ## type 285 #endif 286 287 /* 288 * The callback function to dl_interate_phdr() receives a pointer 289 * to a structure of this type. 290 * 291 * dlpi_addr is defined such that the address of any segment in 292 * the program header array can be calculated as: 293 * 294 * addr == info->dlpi_addr + info->dlpi_phdr[x].p_vaddr; 295 * 296 * It is therefore 0 for ET_EXEC objects, and the base address at 297 * which the object is mapped otherwise. 298 */ 299 struct dl_phdr_info { 300 ElfW(Addr) dlpi_addr; /* Base address of object */ 301 const char *dlpi_name; /* Null-terminated obj name */ 302 const ElfW(Phdr) *dlpi_phdr; /* Ptr to ELF program hdr arr */ 303 ElfW(Half) dlpi_phnum; /* # of items in dlpi_phdr[] */ 304 305 /* 306 * Note: Following members were introduced after the first version 307 * of this structure was available. The dl_iterate_phdr() callback 308 * function is passed a 'size' argument giving the size of the info 309 * structure, and must compare that size to the offset of these fields 310 * before accessing them to ensure that they are present. 311 */ 312 313 /* Incremented when a new object is mapped into the process */ 314 u_longlong_t dlpi_adds; 315 /* Incremented when an object is unmapped from the process */ 316 u_longlong_t dlpi_subs; 317 }; 318 319 extern int dl_iterate_phdr(int (*)(struct dl_phdr_info *, size_t, void *), 320 void *); 321 322 #endif /* _ASM */ 323 #endif /* _KERNEL */ 324 325 326 #ifdef __cplusplus 327 } 328 #endif 329 330 #endif /* _LINK_H */ 331