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Diffstat (limited to 'ldso/include/dl-elf.h')
-rw-r--r--ldso/include/dl-elf.h118
1 files changed, 87 insertions, 31 deletions
diff --git a/ldso/include/dl-elf.h b/ldso/include/dl-elf.h
index 076678cfc..80625fd5b 100644
--- a/ldso/include/dl-elf.h
+++ b/ldso/include/dl-elf.h
@@ -5,18 +5,22 @@
* GNU Lesser General Public License version 2.1 or later.
*/
-#ifndef LINUXELF_H
-#define LINUXELF_H
+#ifndef _DL_ELF_H
+#define _DL_ELF_H
+#include <features.h>
+#include <bits/wordsize.h>
#include <dl-string.h> /* before elf.h to get ELF_USES_RELOCA right */
#include <elf.h>
#include <link.h>
+#include <dl-defs.h>
+#include <dlfcn.h>
-/* Forward declarations for stuff defined in ld_hash.h */
+/* Forward declarations for stuff defined in dl-hash.h */
struct dyn_elf;
struct elf_resolve;
+struct r_scope_elem;
-#include <dl-defs.h>
#ifdef __LDSO_CACHE_SUPPORT__
extern int _dl_map_cache(void);
extern int _dl_unmap_cache(void);
@@ -25,21 +29,18 @@ static __inline__ void _dl_map_cache(void) { }
static __inline__ void _dl_unmap_cache(void) { }
#endif
-
-/* Function prototypes for non-static stuff in readelflib1.c */
+/* Function prototypes for non-static stuff in elfinterp.c */
extern void _dl_parse_lazy_relocation_information(struct dyn_elf *rpnt,
unsigned long rel_addr, unsigned long rel_size);
extern int _dl_parse_relocation_information(struct dyn_elf *rpnt,
- unsigned long rel_addr, unsigned long rel_size);
-extern struct elf_resolve * _dl_load_shared_library(int secure,
+ struct r_scope_elem *scope, unsigned long rel_addr, unsigned long rel_size);
+extern struct elf_resolve * _dl_load_shared_library(unsigned int rflags,
struct dyn_elf **rpnt, struct elf_resolve *tpnt, char *full_libname,
int trace_loaded_objects);
-extern struct elf_resolve * _dl_load_elf_shared_library(int secure,
- struct dyn_elf **rpnt, char *libname);
-extern struct elf_resolve *_dl_check_if_named_library_is_loaded(const char *full_libname,
- int trace_loaded_objects);
+extern struct elf_resolve * _dl_load_elf_shared_library(unsigned int rflags,
+ struct dyn_elf **rpnt, const char *libname);
extern int _dl_linux_resolve(void);
-extern int _dl_fixup(struct dyn_elf *rpnt, int flag);
+extern int _dl_fixup(struct dyn_elf *rpnt, struct r_scope_elem *scope, int flag);
extern void _dl_protect_relro (struct elf_resolve *l);
/*
@@ -84,33 +85,58 @@ extern void _dl_protect_relro (struct elf_resolve *l);
#endif
/* OS and/or GNU dynamic extensions */
+
+#define OS_NUM_BASE 1 /* for DT_RELOCCOUNT */
+
#ifdef __LDSO_GNU_HASH_SUPPORT__
-# define OS_NUM 2 /* for DT_RELOCCOUNT and DT_GNU_HASH entries */
+# define OS_NUM_GNU_HASH 1 /* for DT_GNU_HASH entry */
+#else
+# define OS_NUM_GNU_HASH 0
+#endif
+
+#ifdef __LDSO_PRELINK_SUPPORT__
+# define OS_NUM_PRELINK 6 /* for DT_GNU_PRELINKED entry */
#else
-# define OS_NUM 1 /* for DT_RELOCCOUNT entry */
+# define OS_NUM_PRELINK 0
#endif
+#define OS_NUM (OS_NUM_BASE + OS_NUM_GNU_HASH + OS_NUM_PRELINK)
+
#ifndef ARCH_DYNAMIC_INFO
/* define in arch specific code, if needed */
# define ARCH_NUM 0
#endif
-#define DYNAMIC_SIZE (DT_NUM+OS_NUM+ARCH_NUM)
+#define DYNAMIC_SIZE (DT_NUM + OS_NUM + ARCH_NUM)
/* Keep ARCH specific entries into dynamic section at the end of the array */
#define DT_RELCONT_IDX (DYNAMIC_SIZE - OS_NUM - ARCH_NUM)
#ifdef __LDSO_GNU_HASH_SUPPORT__
/* GNU hash comes just after the relocation count */
# define DT_GNU_HASH_IDX (DT_RELCONT_IDX + 1)
+#else
+# define DT_GNU_HASH_IDX DT_RELCONT_IDX
#endif
-extern void _dl_parse_dynamic_info(ElfW(Dyn) *dpnt, unsigned long dynamic_info[],
- void *debug_addr, DL_LOADADDR_TYPE load_off);
+#ifdef __LDSO_PRELINK_SUPPORT__
+/* GNU prelink comes just after the GNU hash if present */
+#define DT_GNU_PRELINKED_IDX (DT_GNU_HASH_IDX + 1)
+#define DT_GNU_CONFLICT_IDX (DT_GNU_HASH_IDX + 2)
+#define DT_GNU_CONFLICTSZ_IDX (DT_GNU_HASH_IDX + 3)
+#define DT_GNU_LIBLIST_IDX (DT_GNU_HASH_IDX + 4)
+#define DT_GNU_LIBLISTSZ_IDX (DT_GNU_HASH_IDX + 5)
+#define DT_CHECKSUM_IDX (DT_GNU_HASH_IDX + 6)
+#endif
+
+extern unsigned int _dl_parse_dynamic_info(ElfW(Dyn) *dpnt, unsigned long dynamic_info[],
+ void *debug_addr, DL_LOADADDR_TYPE load_off);
static __always_inline
-void __dl_parse_dynamic_info(ElfW(Dyn) *dpnt, unsigned long dynamic_info[],
- void *debug_addr, DL_LOADADDR_TYPE load_off)
+unsigned int __dl_parse_dynamic_info(ElfW(Dyn) *dpnt, unsigned long dynamic_info[],
+ void *debug_addr, DL_LOADADDR_TYPE load_off)
{
+ unsigned int rtld_flags = 0;
+
for (; dpnt->d_tag; dpnt++) {
if (dpnt->d_tag < DT_NUM) {
dynamic_info[dpnt->d_tag] = dpnt->d_un.d_val;
@@ -138,13 +164,30 @@ void __dl_parse_dynamic_info(ElfW(Dyn) *dpnt, unsigned long dynamic_info[],
} else if (dpnt->d_tag < DT_LOPROC) {
if (dpnt->d_tag == DT_RELOCCOUNT)
dynamic_info[DT_RELCONT_IDX] = dpnt->d_un.d_val;
- if (dpnt->d_tag == DT_FLAGS_1 &&
- (dpnt->d_un.d_val & DF_1_NOW))
- dynamic_info[DT_BIND_NOW] = 1;
+ if (dpnt->d_tag == DT_FLAGS_1) {
+ if (dpnt->d_un.d_val & DF_1_NOW)
+ dynamic_info[DT_BIND_NOW] = 1;
+ if (dpnt->d_un.d_val & DF_1_NODELETE)
+ rtld_flags |= RTLD_NODELETE;
+ }
#ifdef __LDSO_GNU_HASH_SUPPORT__
if (dpnt->d_tag == DT_GNU_HASH)
dynamic_info[DT_GNU_HASH_IDX] = dpnt->d_un.d_ptr;
#endif
+#ifdef __LDSO_PRELINK_SUPPORT__
+ if (dpnt->d_tag == DT_GNU_PRELINKED)
+ dynamic_info[DT_GNU_PRELINKED_IDX] = dpnt->d_un.d_val;
+ if (dpnt->d_tag == DT_GNU_CONFLICT)
+ dynamic_info[DT_GNU_CONFLICT_IDX] = dpnt->d_un.d_ptr;
+ if (dpnt->d_tag == DT_GNU_CONFLICTSZ)
+ dynamic_info[DT_GNU_CONFLICTSZ_IDX] = dpnt->d_un.d_val;
+ if (dpnt->d_tag == DT_GNU_LIBLIST)
+ dynamic_info[DT_GNU_LIBLIST_IDX] = dpnt->d_un.d_ptr;
+ if (dpnt->d_tag == DT_GNU_LIBLISTSZ)
+ dynamic_info[DT_GNU_LIBLISTSZ_IDX] = dpnt->d_un.d_val;
+ if (dpnt->d_tag == DT_CHECKSUM)
+ dynamic_info[DT_CHECKSUM_IDX] = dpnt->d_un.d_val;
+#endif
}
#ifdef ARCH_DYNAMIC_INFO
else {
@@ -157,16 +200,29 @@ void __dl_parse_dynamic_info(ElfW(Dyn) *dpnt, unsigned long dynamic_info[],
if (dynamic_info[tag]) \
dynamic_info[tag] = (unsigned long) DL_RELOC_ADDR(load_off, dynamic_info[tag]); \
} while (0)
- ADJUST_DYN_INFO(DT_HASH, load_off);
- ADJUST_DYN_INFO(DT_PLTGOT, load_off);
- ADJUST_DYN_INFO(DT_STRTAB, load_off);
- ADJUST_DYN_INFO(DT_SYMTAB, load_off);
- ADJUST_DYN_INFO(DT_RELOC_TABLE_ADDR, load_off);
- ADJUST_DYN_INFO(DT_JMPREL, load_off);
+ /* Don't adjust .dynamic unnecessarily. For FDPIC targets,
+ we'd have to walk all the loadsegs to find out if it was
+ actually unnecessary, so skip this optimization. */
+#if !defined __FRV_FDPIC__ && !defined __BFIN_FDPIC__ && !defined __DSBT__
+ if (load_off != 0)
+#endif
+ {
+ ADJUST_DYN_INFO(DT_HASH, load_off);
+ ADJUST_DYN_INFO(DT_PLTGOT, load_off);
+ ADJUST_DYN_INFO(DT_STRTAB, load_off);
+ ADJUST_DYN_INFO(DT_SYMTAB, load_off);
+ ADJUST_DYN_INFO(DT_RELOC_TABLE_ADDR, load_off);
+ ADJUST_DYN_INFO(DT_JMPREL, load_off);
#ifdef __LDSO_GNU_HASH_SUPPORT__
- ADJUST_DYN_INFO(DT_GNU_HASH_IDX, load_off);
+ ADJUST_DYN_INFO(DT_GNU_HASH_IDX, load_off);
+#endif
+ }
+#ifdef __DSBT__
+ /* Get the mapped address of the DSBT base. */
+ ADJUST_DYN_INFO(DT_DSBT_BASE_IDX, load_off);
#endif
#undef ADJUST_DYN_INFO
+ return rtld_flags;
}
/* Reloc type classes as returned by elf_machine_type_class().
@@ -196,4 +252,4 @@ void __dl_parse_dynamic_info(ElfW(Dyn) *dpnt, unsigned long dynamic_info[],
(((X) & PF_X) ? PROT_EXEC : 0))
-#endif /* LINUXELF_H */
+#endif /* _DL_ELF_H */
generated by cgit v1.2.3 (git 2.46.0) at 2025-12-05 01:14:58 +0000