4 #include <dl-string.h> /* before elf.h to get ELF_USES_RELOCA right */
8 /* Forward declarations for stuff defined in ld_hash.h */
13 #ifdef __LDSO_CACHE_SUPPORT__
14 extern int _dl_map_cache(void);
15 extern int _dl_unmap_cache(void);
17 static inline void _dl_map_cache(void) { }
18 static inline void _dl_unmap_cache(void) { }
22 /* Function prototypes for non-static stuff in readelflib1.c */
23 extern void _dl_parse_lazy_relocation_information(struct dyn_elf *rpnt,
24 unsigned long rel_addr, unsigned long rel_size);
25 extern int _dl_parse_relocation_information(struct dyn_elf *rpnt,
26 unsigned long rel_addr, unsigned long rel_size);
27 extern struct elf_resolve * _dl_load_shared_library(int secure,
28 struct dyn_elf **rpnt, struct elf_resolve *tpnt, char *full_libname,
29 int trace_loaded_objects);
30 extern struct elf_resolve * _dl_load_elf_shared_library(int secure,
31 struct dyn_elf **rpnt, char *libname);
32 extern struct elf_resolve *_dl_check_if_named_library_is_loaded(const char *full_libname,
33 int trace_loaded_objects);
34 extern int _dl_linux_resolve(void);
35 extern int _dl_fixup(struct dyn_elf *rpnt, int flag);
36 extern void _dl_protect_relro (struct elf_resolve *l);
39 * Bitsize related settings for things ElfW()
40 * does not handle already
43 # define ELF_ST_BIND(val) ELF64_ST_TYPE(val)
44 # define ELF_ST_TYPE(val) ELF64_ST_TYPE(val)
45 # define ELF_R_SYM(i) ELF64_R_SYM(i)
47 # define ELF_CLASS ELFCLASS64
50 # define ELF_ST_BIND(val) ELF32_ST_TYPE(val)
51 # define ELF_ST_TYPE(val) ELF32_ST_TYPE(val)
52 # define ELF_R_SYM(i) ELF32_R_SYM(i)
54 # define ELF_CLASS ELFCLASS32
59 * Datatype of a relocation on this platform
61 #ifdef ELF_USES_RELOCA
62 # define ELF_RELOC ElfW(Rela)
63 # define DT_RELOC_TABLE_ADDR DT_RELA
64 # define DT_RELOC_TABLE_SIZE DT_RELASZ
65 # define DT_RELOCCOUNT DT_RELACOUNT
66 # define UNSUPPORTED_RELOC_TYPE DT_REL
67 # define UNSUPPORTED_RELOC_STR "REL"
69 # define ELF_RELOC ElfW(Rel)
70 # define DT_RELOC_TABLE_ADDR DT_REL
71 # define DT_RELOC_TABLE_SIZE DT_RELSZ
72 # define DT_RELOCCOUNT DT_RELCOUNT
73 # define UNSUPPORTED_RELOC_TYPE DT_RELA
74 # define UNSUPPORTED_RELOC_STR "RELA"
77 /* OS and/or GNU dynamic extensions */
79 #define DT_RELCONT_IDX DT_NUM
81 #ifndef ARCH_DYNAMIC_INFO
82 /* define in arch specific code, if needed */
86 #define DYNAMIC_SIZE (DT_NUM+OS_NUM+ARCH_NUM)
88 extern void _dl_parse_dynamic_info(ElfW(Dyn) *dpnt, unsigned long dynamic_info[], void *debug_addr, ElfW(Addr) load_off);
90 static __always_inline
91 void __dl_parse_dynamic_info(ElfW(Dyn) *dpnt, unsigned long dynamic_info[], void *debug_addr, ElfW(Addr) load_off)
93 for (; dpnt->d_tag; dpnt++) {
94 if (dpnt->d_tag < DT_NUM) {
95 dynamic_info[dpnt->d_tag] = dpnt->d_un.d_val;
97 if (dpnt->d_tag == DT_DEBUG)
98 dpnt->d_un.d_val = (unsigned long)debug_addr;
100 if (dpnt->d_tag == DT_BIND_NOW)
101 dynamic_info[DT_BIND_NOW] = 1;
102 if (dpnt->d_tag == DT_FLAGS &&
103 (dpnt->d_un.d_val & DF_BIND_NOW))
104 dynamic_info[DT_BIND_NOW] = 1;
105 if (dpnt->d_tag == DT_TEXTREL)
106 dynamic_info[DT_TEXTREL] = 1;
107 if (dpnt->d_tag == DT_RUNPATH)
108 dynamic_info[DT_RPATH] = 0;
109 if (dpnt->d_tag == DT_RPATH && dynamic_info[DT_RUNPATH])
110 dynamic_info[DT_RPATH] = 0;
111 } else if (dpnt->d_tag < DT_LOPROC) {
112 if (dpnt->d_tag == DT_RELOCCOUNT)
113 dynamic_info[DT_RELCONT_IDX] = dpnt->d_un.d_val;
114 if (dpnt->d_tag == DT_FLAGS_1 &&
115 (dpnt->d_un.d_val & DF_1_NOW))
116 dynamic_info[DT_BIND_NOW] = 1;
118 #ifdef ARCH_DYNAMIC_INFO
120 ARCH_DYNAMIC_INFO(dpnt, dynamic_info, debug_addr);
124 # define ADJUST_DYN_INFO(tag, load_off) \
126 if (dynamic_info[tag]) \
127 dynamic_info[tag] += load_off; \
130 ADJUST_DYN_INFO (DT_HASH, load_off);
131 ADJUST_DYN_INFO (DT_PLTGOT, load_off);
132 ADJUST_DYN_INFO (DT_STRTAB, load_off);
133 ADJUST_DYN_INFO (DT_SYMTAB, load_off);
134 ADJUST_DYN_INFO (DT_RELOC_TABLE_ADDR, load_off);
135 ADJUST_DYN_INFO (DT_JMPREL, load_off);
136 # undef ADJUST_DYN_INFO
140 /* Reloc type classes as returned by elf_machine_type_class().
141 ELF_RTYPE_CLASS_PLT means this reloc should not be satisfied by
142 some PLT symbol, ELF_RTYPE_CLASS_COPY means this reloc should not be
143 satisfied by any symbol in the executable. Some architectures do
144 not support copy relocations. In this case we define the macro to
145 zero so that the code for handling them gets automatically optimized
147 #ifdef DL_NO_COPY_RELOCS
148 # define ELF_RTYPE_CLASS_COPY (0x0)
150 # define ELF_RTYPE_CLASS_COPY (0x2)
152 #define ELF_RTYPE_CLASS_PLT (0x1)
155 /* Convert between the Linux flags for page protections and the
156 ones specified in the ELF standard. */
157 #define LXFLAGS(X) ( (((X) & PF_R) ? PROT_READ : 0) | \
158 (((X) & PF_W) ? PROT_WRITE : 0) | \
159 (((X) & PF_X) ? PROT_EXEC : 0))
162 #endif /* LINUXELF_H */