link.h revision 11690:1c19a1778a4f
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 38extern "C" { 39#endif 40 41#ifndef _ASM 42/* 43 * ld support library calls 44 */ 45#ifdef __STDC__ 46extern uint_t ld_version(uint_t); 47extern void ld_input_done(uint_t *); 48 49extern void ld_start(const char *, const Elf32_Half, const char *); 50extern void ld_atexit(int); 51extern void ld_open(const char **, const char **, int *, int, Elf **, 52 Elf *, size_t, const Elf_Kind); 53extern void ld_file(const char *, const Elf_Kind, int, Elf *); 54extern void ld_input_section(const char *, Elf32_Shdr **, Elf32_Word, 55 Elf_Data *, Elf *, uint_t *); 56extern void ld_section(const char *, Elf32_Shdr *, Elf32_Word, 57 Elf_Data *, Elf *); 58 59#if defined(_LP64) || defined(_LONGLONG_TYPE) 60extern void ld_start64(const char *, const Elf64_Half, const char *); 61extern void ld_atexit64(int); 62extern void ld_open64(const char **, const char **, int *, int, Elf **, 63 Elf *, size_t, const Elf_Kind); 64extern void ld_file64(const char *, const Elf_Kind, int, Elf *); 65extern void ld_input_section64(const char *, Elf64_Shdr **, Elf64_Word, 66 Elf_Data *, Elf *, uint_t *); 67extern void ld_section64(const char *, Elf64_Shdr *, Elf64_Word, 68 Elf_Data *, Elf *); 69 70#endif /* (defined(_LP64) || defined(_LONGLONG_TYPE) */ 71#else 72extern void ld_version(); 73extern void ld_input_done(); 74 75extern void ld_start(); 76extern void ld_atexit(); 77extern void ld_open(); 78extern void ld_file(); 79extern void ld_input_section(); 80extern void ld_section(); 81 82#if defined(_LP64) || defined(_LONGLONG_TYPE) 83extern void ld_start64(); 84extern void ld_atexit64(); 85extern void ld_open64(); 86extern void ld_file64(); 87extern void ld_input_section64(); 88extern 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) 174typedef long lagreg_t; 175#else 176typedef int lagreg_t; 177#endif 178 179struct _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) 191typedef struct _la_sparc_regs La_sparcv9_regs; 192typedef 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 203typedef struct _la_sparc_regs La_sparcv8_regs; 204typedef 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) 212typedef unsigned long uintptr_t; 213#else 214typedef unsigned int uintptr_t; 215#endif 216#endif 217 218 219#ifdef __STDC__ 220extern uint_t la_version(uint_t); 221extern void la_activity(uintptr_t *, uint_t); 222extern void la_preinit(uintptr_t *); 223extern char *la_objsearch(const char *, uintptr_t *, uint_t); 224extern uint_t la_objopen(Link_map *, Lmid_t, uintptr_t *); 225extern uint_t la_objclose(uintptr_t *); 226extern int la_objfilter(uintptr_t *, const char *, uintptr_t *, 227 uint_t); 228#if defined(_LP64) 229extern uintptr_t la_amd64_pltenter(Elf64_Sym *, uint_t, uintptr_t *, 230 uintptr_t *, La_amd64_regs *, uint_t *, 231 const char *); 232extern uintptr_t la_symbind64(Elf64_Sym *, uint_t, uintptr_t *, 233 uintptr_t *, uint_t *, const char *); 234extern uintptr_t la_sparcv9_pltenter(Elf64_Sym *, uint_t, uintptr_t *, 235 uintptr_t *, La_sparcv9_regs *, uint_t *, 236 const char *); 237extern uintptr_t la_pltexit64(Elf64_Sym *, uint_t, uintptr_t *, 238 uintptr_t *, uintptr_t, const char *); 239#else /* !defined(_LP64) */ 240extern uintptr_t la_symbind32(Elf32_Sym *, uint_t, uintptr_t *, 241 uintptr_t *, uint_t *); 242extern uintptr_t la_sparcv8_pltenter(Elf32_Sym *, uint_t, uintptr_t *, 243 uintptr_t *, La_sparcv8_regs *, uint_t *); 244extern uintptr_t la_i86_pltenter(Elf32_Sym *, uint_t, uintptr_t *, 245 uintptr_t *, La_i86_regs *, uint_t *); 246extern uintptr_t la_pltexit(Elf32_Sym *, uint_t, uintptr_t *, 247 uintptr_t *, uintptr_t); 248#endif /* _LP64 */ 249#else /* __STDC__ */ 250extern uint_t la_version(); 251extern void la_preinit(); 252extern uint_t la_objopen(); 253extern uint_t la_objclose(); 254extern int la_objfilter(); 255#if defined(_LP64) 256extern uintptr_t la_sparcv9_pltenter(); 257extern uintptr_t la_pltexit64(); 258extern uintptr_t la_symbind64(); 259#else /* _ILP32 */ 260extern uintptr_t la_sparcv8_pltenter(); 261extern uintptr_t la_i86_pltenter(); 262extern uintptr_t la_pltexit(); 263extern 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 */ 299struct 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 319extern 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