2 * Copyright (C) 2000-2006 by Erik Andersen <andersen@codepoet.org>
4 * GNU Lesser General Public License version 2.1 or later.
11 #define FLAG_TYPE_MASK 0x00ff
12 #define FLAG_LIBC4 0x0000
13 #define FLAG_ELF 0x0001
14 #define FLAG_ELF_LIBC5 0x0002
15 #define FLAG_ELF_LIBC6 0x0003
16 #define FLAG_ELF_UCLIBC 0x0004
17 #define FLAG_REQUIRED_MASK 0xff00
18 #define FLAG_SPARC_LIB64 0x0100
19 #define FLAG_IA64_LIB64 0x0200
20 #define FLAG_X8664_LIB64 0x0300
21 #define FLAG_S390_LIB64 0x0400
22 #define FLAG_POWERPC_LIB64 0x0500
23 #define FLAG_MIPS64_LIBN32 0x0600
24 #define FLAG_MIPS64_LIBN64 0x0700
29 #define LIB_ELF64 0x80
30 #define LIB_ELF_LIBC5 2
31 #define LIB_ELF_LIBC6 3
32 #define LIB_ELF_LIBC0 4
34 #if defined(__LDSO_PRELOAD_FILE_SUPPORT__) || defined(__LDSO_CACHE_SUPPORT__)
35 #ifndef __LDSO_BASE_FILENAME__
36 #define __LDSO_BASE_FILENAME__ "ld.so"
38 #define LDSO_BASE_PATH UCLIBC_RUNTIME_PREFIX "etc/" __LDSO_BASE_FILENAME__
40 #ifdef __LDSO_PRELOAD_FILE_SUPPORT__
41 #define LDSO_PRELOAD LDSO_BASE_PATH ".preload"
44 #ifdef __LDSO_CACHE_SUPPORT__
45 #define LDSO_CONF LDSO_BASE_PATH ".conf"
46 #define LDSO_CACHE LDSO_BASE_PATH ".cache"
48 #define LDSO_CACHE_MAGIC "ld.so-"
49 #define LDSO_CACHE_MAGIC_LEN (sizeof LDSO_CACHE_MAGIC -1)
50 #define LDSO_CACHE_VER "1.7.0"
51 #define LDSO_CACHE_VER_LEN (sizeof LDSO_CACHE_VER -1)
54 char magic
[LDSO_CACHE_MAGIC_LEN
];
55 char version
[LDSO_CACHE_VER_LEN
];
65 #ifdef __ARCH_USE_MMU__
66 #define LDSO_CACHE_MMAP_FLAGS (MAP_SHARED)
68 #define LDSO_CACHE_MMAP_FLAGS (MAP_PRIVATE)
70 #endif /* __LDSO_CACHE_SUPPORT__ */
75 #ifndef __ARCH_HAS_NO_SHARED__
76 /* arch specific defines */
77 #include <dl-sysdep.h>
81 /* Provide a means for a port to pass additional arguments to the _dl_start
84 # define DL_START(X) static void * __attribute_used__ _dl_start(X)
87 /* Machines in which different sections may be relocated by different
88 * amounts should define this and LD_RELOC_ADDR. If you change this,
89 * make sure you change struct link_map in include/link.h accordingly
90 * such that it matches a prefix of struct elf_resolve.
92 #ifndef DL_LOADADDR_TYPE
93 # define DL_LOADADDR_TYPE ElfW(Addr)
96 /* When DL_LOADADDR_TYPE is not a scalar value, or some different
97 * computation is needed to relocate an address, define this.
100 # define DL_RELOC_ADDR(LOADADDR, ADDR) \
101 ((LOADADDR) + (ADDR))
104 /* Initialize the location of the dynamic addr. This is only called
105 * from DL_START, so additional arguments passed to it may be referenced. */
106 #ifndef DL_BOOT_COMPUTE_DYN
107 #define DL_BOOT_COMPUTE_DYN(DPNT, GOT, LOAD_ADDR) \
108 ((DPNT) = ((ElfW(Dyn) *) DL_RELOC_ADDR(LOAD_ADDR, GOT)))
111 /* Initialize the location of the global offset table. This is only called
112 * from DL_START, so additional arguments passed to it may be referenced. */
113 #ifndef DL_BOOT_COMPUTE_GOT
114 #define DL_BOOT_COMPUTE_GOT(GOT) \
115 ((GOT) = elf_machine_dynamic())
118 /* Initialize a LOADADDR representing the loader itself. It's only
119 * called from DL_START, so additional arguments passed to it may be
122 #ifndef DL_INIT_LOADADDR_BOOT
123 # define DL_INIT_LOADADDR_BOOT(LOADADDR, BASEADDR) \
124 ((LOADADDR) = (BASEADDR))
127 /* Define if any declarations/definitions of local variables are
128 * needed in a function that calls DT_INIT_LOADADDR or
129 * DL_INIT_LOADADDR_HDR. Declarations must be properly terminated
130 * with a semicolon, and non-declaration statements are forbidden.
132 #ifndef DL_INIT_LOADADDR_EXTRA_DECLS
133 # define DL_INIT_LOADADDR_EXTRA_DECLS /* int i; */
136 /* Prepare a DL_LOADADDR_TYPE data structure for incremental
137 * initialization with DL_INIT_LOADADDR_HDR, given pointers to a base
138 * load address and to program headers.
140 #ifndef DL_INIT_LOADADDR
141 # define DL_INIT_LOADADDR(LOADADDR, BASEADDR, PHDR, PHDRCNT) \
142 ((LOADADDR) = (BASEADDR))
145 /* Initialize a LOADADDR representing the program. It's called from
148 #ifndef DL_INIT_LOADADDR_PROG
149 # define DL_INIT_LOADADDR_PROG(LOADADDR, BASEADDR) \
150 ((LOADADDR) = (DL_LOADADDR_TYPE)(BASEADDR))
153 /* Update LOADADDR with information about PHDR, just mapped to the
155 #ifndef DL_INIT_LOADADDR_HDR
156 # define DL_INIT_LOADADDR_HDR(LOADADDR, ADDR, PHDR) /* Do nothing. */
159 /* Convert a DL_LOADADDR_TYPE to an identifying pointer. Used mostly
162 #ifndef DL_LOADADDR_BASE
163 # define DL_LOADADDR_BASE(LOADADDR) (LOADADDR)
166 /* Test whether a given ADDR is more likely to be within the memory
167 * region mapped to TPNT (a struct elf_resolve *) than to TFROM.
168 * Everywhere that this is used, TFROM is initially NULL, and whenever
169 * a potential match is found, it's updated. One might want to walk
170 * the chain of elf_resolve to locate the best match and return false
171 * whenever TFROM is non-NULL, or use an exact-matching algorithm
172 * using additional information encoded in DL_LOADADDR_TYPE to test
173 * for exact containment.
175 #ifndef DL_ADDR_IN_LOADADDR
176 # define DL_ADDR_IN_LOADADDR(ADDR, TPNT, TFROM) \
177 ((void*)(TPNT)->mapaddr < (void*)(ADDR) \
178 && (!(TFROM) || (TFROM)->mapaddr < (TPNT)->mapaddr))
181 /* This is called from dladdr() to give targets that use function descriptors
182 * a chance to map a function descriptor's address to the function's entry
183 * point before trying to find in which library it's defined. */
184 #ifndef DL_LOOKUP_ADDRESS
185 #define DL_LOOKUP_ADDRESS(ADDRESS) (ADDRESS)
188 /* On some architectures dladdr can't use st_size of all symbols this way. */
189 #define DL_ADDR_SYM_MATCH(SYM_ADDR, SYM, MATCHSYM, ADDR) \
190 ((ADDR) >= (SYM_ADDR) \
191 && ((((SYM)->st_shndx == SHN_UNDEF || (SYM)->st_size == 0) \
192 && (ADDR) == (SYM_ADDR)) \
193 || (ADDR) < (SYM_ADDR) + (SYM)->st_size) \
194 && (!(MATCHSYM) || MATCHSYM < (SYM_ADDR)))
196 /* Use this macro to convert a pointer to a function's entry point to
197 * a pointer to function. The pointer is assumed to have already been
198 * relocated. LOADADDR is passed because it may contain additional
199 * information needed to compute the pointer to function.
201 #ifndef DL_ADDR_TO_FUNC_PTR
202 # define DL_ADDR_TO_FUNC_PTR(ADDR, LOADADDR) ((void(*)(void))(ADDR))
205 /* On some platforms, computing a pointer to function is more
206 expensive than calling a function at a given address, so this
207 alternative is provided. The function signature must be given
208 within parentheses, as in a type cast. */
209 #ifndef DL_CALL_FUNC_AT_ADDR
210 # define DL_CALL_FUNC_AT_ADDR(ADDR, LOADADDR, SIGNATURE, ...) \
211 ((*SIGNATURE DL_ADDR_TO_FUNC_PTR ((ADDR), (LOADADDR)))(__VA_ARGS__))
214 /* An alignment value for a memory block returned by _dl_malloc. */
215 #ifndef DL_MALLOC_ALIGN
216 # define DL_MALLOC_ALIGN (__WORDSIZE / 8)
219 #ifdef __UCLIBC_UNDERSCORES__
220 # define __C_SYMBOL_PREFIX__ "_"
222 # define __C_SYMBOL_PREFIX__ ""
225 /* Define this if you want to modify the VALUE returned by
226 _dl_find_hash for this reloc TYPE. TPNT is the module in which the
227 matching SYM was found. */
228 #ifndef DL_FIND_HASH_VALUE
229 # define DL_FIND_HASH_VALUE(TPNT, TYPE, SYM) (DL_RELOC_ADDR ((TPNT)->loadaddr, (SYM)->st_value))
232 /* Unmap all previously-mapped segments accumulated in LOADADDR.
233 Generally used when an error occurs during loading. */
234 #ifndef DL_LOADADDR_UNMAP
235 # define DL_LOADADDR_UNMAP(LOADADDR, LEN) \
236 _dl_munmap((char *) (LOADADDR), (LEN))
239 /* Similar to DL_LOADADDR_UNMAP, but used for libraries that have been
240 dlopen()ed successfully, when they're dlclose()d. */
242 # define DL_LIB_UNMAP(LIB, LEN) (DL_LOADADDR_UNMAP ((LIB)->mapaddr, (LEN)))
245 /* Define this to verify that a library named LIBNAME, whose ELF
246 headers are pointed to by EPNT, is suitable for dynamic linking.
247 If it is not, print an error message (optional) and return NULL.
248 If the library can have its segments relocated independently,
249 arrange for PICLIB to be set to 2. If all segments have to be
250 relocated by the same amount, set it to 1. If it has to be loaded
251 at physical addresses as specified in the program headers, set it
252 to 0. A reasonable (?) guess for PICLIB will already be in place,
253 so it is safe to do nothing here. */
254 #ifndef DL_CHECK_LIB_TYPE
255 # define DL_CHECK_LIB_TYPE(EPNT, PICLIB, PROGNAME, LIBNAME) (void)0
258 /* Define this if you have special segment. */
259 #ifndef DL_IS_SPECIAL_SEGMENT
260 # define DL_IS_SPECIAL_SEGMENT(EPNT, PPNT) 0
263 /* Define this if you want to use special method to map the segment. */
264 #ifndef DL_MAP_SEGMENT
265 # define DL_MAP_SEGMENT(EPNT, PPNT, INFILE, FLAGS) 0
268 /* Define this to declare the library offset. */
269 #ifndef DL_DEF_LIB_OFFSET
270 # define DL_DEF_LIB_OFFSET static unsigned long _dl_library_offset
273 /* Define this to get the library offset. */
274 #ifndef DL_GET_LIB_OFFSET
275 # define DL_GET_LIB_OFFSET() _dl_library_offset
278 /* Define this to set the library offset as difference beetwen the mapped
279 library address and the smallest virtual address of the first PT_LOAD
281 #ifndef DL_SET_LIB_OFFSET
282 # define DL_SET_LIB_OFFSET(offset) (_dl_library_offset = (offset))
285 /* Define this to get the real object's runtime address. */
286 #ifndef DL_GET_RUN_ADDR
287 # define DL_GET_RUN_ADDR(loadaddr, mapaddr) (mapaddr)
290 #endif /* _DL_DEFS_H */