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/*
* 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 <linux/elf.h>
#undef PAGE_MASK
#undef PAGE_SIZE
#define PAGE_SIZE 4096
#define PAGE_MASK 4095
void debugger_init();
const char *addr_to_name(unsigned addr);
/* magic shared structures that GDB knows about */
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;
};
typedef struct soinfo soinfo;
#define FLAG_LINKED 0x00000001
#define FLAG_ERROR 0x00000002
#define FLAG_EXE 0x00000004 // The main executable
#define FLAG_PRELINKED 0x00000008 // This is a pre-linked lib
#define SOINFO_NAME_LEN 128
struct soinfo
{
const char name[SOINFO_NAME_LEN];
Elf32_Phdr *phdr;
int phnum;
unsigned entry;
unsigned base;
unsigned size;
// buddy-allocator index, negative for prelinked libraries
int ba_index;
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;
};
extern soinfo libdl_info;
/* these must all be powers of two */
#define LIBBASE 0x80000000
#define LIBLAST 0x90000000
#define LIBINC 0x00100000
#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
#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 /* ANDROID_*_LINKER */
#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
/* in theory we only need the above relative relocations,
but in practice the following one turns up from time
to time. fushigi na.
*/
#define R_ARM_ABS32 2
soinfo *find_library(const char *name);
unsigned unload_library(soinfo *si);
Elf32_Sym *lookup_in_library(soinfo *si, const char *name);
Elf32_Sym *lookup(const char *name, unsigned *base);
const char *linker_get_error(void);
#ifdef ANDROID_ARM_LINKER
typedef long unsigned int *_Unwind_Ptr;
_Unwind_Ptr dl_unwind_find_exidx(_Unwind_Ptr pc, int *pcount);
#elif defined(ANDROID_X86_LINKER)
int dl_iterate_phdr(int (*cb)(struct dl_phdr_info *, size_t, void *), void *);
#endif
#endif
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