diff options
Diffstat (limited to 'src/linker/linker.h')
| -rw-r--r-- | src/linker/linker.h | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/src/linker/linker.h b/src/linker/linker.h new file mode 100644 index 0000000..13d9bff --- /dev/null +++ b/src/linker/linker.h @@ -0,0 +1,226 @@ +/* + * Copyright (C) 2008 The Android Open Source Project + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#ifndef _LINKER_H_ +#define _LINKER_H_ + +#include <unistd.h> +#include <sys/types.h> +#include <elf.h> +#include <link.h> + +#undef PAGE_MASK +#undef PAGE_SIZE +#define PAGE_SIZE 4096 +#define PAGE_MASK 4095 + +void apkenv_debugger_init(); + +/* magic shared structures that GDB knows about */ + +#if 0 +struct link_map +{ + uintptr_t l_addr; + char * l_name; + uintptr_t l_ld; + struct link_map * l_next; + struct link_map * l_prev; +}; + +/* needed for dl_iterate_phdr to be passed to the callbacks provided */ +struct dl_phdr_info +{ + Elf32_Addr dlpi_addr; + const char *dlpi_name; + const Elf32_Phdr *dlpi_phdr; + Elf32_Half dlpi_phnum; +}; + + +// Values for r_debug->state +enum { + RT_CONSISTENT, + RT_ADD, + RT_DELETE +}; + +struct r_debug +{ + int32_t r_version; + struct link_map * r_map; + void (*r_brk)(void); + int32_t r_state; + uintptr_t r_ldbase; +}; +#endif + +typedef struct soinfo soinfo; + +#define FLAG_LINKED 0x00000001 +#define FLAG_ERROR 0x00000002 +#define FLAG_EXE 0x00000004 // The main executable +#define FLAG_LINKER 0x00000010 // The linker itself + +#define SOINFO_NAME_LEN 128 + +struct soinfo +{ + const char name[SOINFO_NAME_LEN]; + Elf32_Phdr *phdr; + int phnum; + unsigned entry; + unsigned base; + unsigned size; + + int unused; // DO NOT USE, maintained for compatibility. + + unsigned *dynamic; + + unsigned wrprotect_start; + unsigned wrprotect_end; + + soinfo *next; + unsigned flags; + + const char *strtab; + Elf32_Sym *symtab; + + unsigned nbucket; + unsigned nchain; + unsigned *bucket; + unsigned *chain; + + unsigned *plt_got; + + Elf32_Rel *plt_rel; + unsigned plt_rel_count; + + Elf32_Rel *rel; + unsigned rel_count; + + unsigned *preinit_array; + unsigned preinit_array_count; + + unsigned *init_array; + unsigned init_array_count; + unsigned *fini_array; + unsigned fini_array_count; + + void (*init_func)(void); + void (*fini_func)(void); + +#ifdef ANDROID_ARM_LINKER + /* ARM EABI section used for stack unwinding. */ + unsigned *ARM_exidx; + unsigned ARM_exidx_count; +#endif + + unsigned refcount; + struct link_map linkmap; + + int constructors_called; + + Elf32_Addr gnu_relro_start; + unsigned gnu_relro_len; + + /* apkenv stuff */ + char fullpath[SOINFO_NAME_LEN]; +}; + + +extern soinfo apkenv_libdl_info; + +#ifdef ANDROID_ARM_LINKER + +#define R_ARM_COPY 20 +#define R_ARM_GLOB_DAT 21 +#define R_ARM_JUMP_SLOT 22 +#define R_ARM_RELATIVE 23 + +/* According to the AAPCS specification, we only + * need the above relocations. However, in practice, + * the following ones turn up from time to time. + */ +#define R_ARM_ABS32 2 +#define R_ARM_REL32 3 + +#elif defined(ANDROID_X86_LINKER) + +#define R_386_32 1 +#define R_386_PC32 2 +#define R_386_GLOB_DAT 6 +#define R_386_JUMP_SLOT 7 +#define R_386_RELATIVE 8 + +#endif + +#ifndef DT_INIT_ARRAY +#define DT_INIT_ARRAY 25 +#endif + +#ifndef DT_FINI_ARRAY +#define DT_FINI_ARRAY 26 +#endif + +#ifndef DT_INIT_ARRAYSZ +#define DT_INIT_ARRAYSZ 27 +#endif + +#ifndef DT_FINI_ARRAYSZ +#define DT_FINI_ARRAYSZ 28 +#endif + +#ifndef DT_PREINIT_ARRAY +#define DT_PREINIT_ARRAY 32 +#endif + +#ifndef DT_PREINIT_ARRAYSZ +#define DT_PREINIT_ARRAYSZ 33 +#endif + +soinfo *apkenv_find_library(const char *name); +unsigned apkenv_unload_library(soinfo *si); +Elf32_Sym *apkenv_lookup_in_library(soinfo *si, const char *name); +Elf32_Sym *apkenv_lookup(const char *name, soinfo **found, soinfo *start); +soinfo *apkenv_find_containing_library(const void *addr); +Elf32_Sym *apkenv_find_containing_symbol(const void *addr, soinfo *si); +const char *apkenv_linker_get_error(void); +void apkenv_call_constructors_recursive(soinfo *si); + +#ifdef ANDROID_ARM_LINKER +typedef long unsigned int *_Unwind_Ptr; +_Unwind_Ptr apkenv_dl_unwind_find_exidx(_Unwind_Ptr pc, int *pcount); +#elif defined(ANDROID_X86_LINKER) +int apkenv_dl_iterate_phdr(int (*cb)(struct dl_phdr_info *, size_t, void *), void *); +#endif + +void apkenv_notify_gdb_of_libraries(void); +int apkenv_add_sopath(const char *path); + +#endif |