dynlink.h

#ifndef _INTERNAL_RELOC_H
#define _INTERNAL_RELOC_H

#include <features.h>
#include <elf.h>
#include <stdint.h>
#include <stddef.h>
#include <stdarg.h>
#include <link.h>
#include <sys/types.h>
#include <stdlib.h>
#include "libc.h"
#include "../../ldso/namespace.h"

#if UINTPTR_MAX == 0xffffffff
typedef Elf32_Ehdr Ehdr;
typedef Elf32_Phdr Phdr;
typedef Elf32_Sym Sym;
typedef Elf32_Verdaux Verdaux;
typedef Elf32_Verdef Verdef;
typedef Elf32_Vernaux Vernaux;
typedef Elf32_Verneed Verneed;
#define R_TYPE(x) ((x)&255)
#define R_SYM(x) ((x)>>8)
#define R_INFO ELF32_R_INFO
#else
typedef Elf64_Ehdr Ehdr;
typedef Elf64_Phdr Phdr;
typedef Elf64_Sym Sym;
typedef Elf64_Verdaux Verdaux;
typedef Elf64_Verdef Verdef;
typedef Elf64_Vernaux Vernaux;
typedef Elf64_Verneed Verneed;
#define R_TYPE(x) ((x)&0x7fffffff)
#define R_SYM(x) ((x)>>32)
#define R_INFO ELF64_R_INFO
#endif

/* These enum constants provide unmatchable default values for
 * any relocation type the arch does not use. */
enum {
	REL_NONE = 0,
	REL_SYMBOLIC = -100,
	REL_USYMBOLIC,
	REL_GOT,
	REL_PLT,
	REL_RELATIVE,
	REL_OFFSET,
	REL_OFFSET32,
	REL_COPY,
	REL_SYM_OR_REL,
	REL_DTPMOD,
	REL_DTPOFF,
	REL_TPOFF,
	REL_TPOFF_NEG,
	REL_TLSDESC,
	REL_FUNCDESC,
	REL_FUNCDESC_VAL,
};

struct td_index {
	size_t args[2];
	struct td_index *next;
};

struct verinfo {
	const char *s;
	const char *v;
	bool use_vna_hash;
	uint32_t vna_hash;
};

struct sym_info_pair {
	uint_fast32_t sym_h;
	uint32_t sym_l;
};

struct dso {
#if DL_FDPIC
	struct fdpic_loadmap *loadmap;
#else
	unsigned char *base;
#endif
	char *name;
	size_t *dynv;
	struct dso *next, *prev;
	/* add namespace */
	ns_t *namespace;
	/* mark the dso status */
	unsigned int flags;

	int cache_sym_index;
	struct dso *cache_dso;
	Sym *cache_sym;

	Phdr *phdr;
	int phnum;
	size_t phentsize;
	Sym *syms;
	Elf_Symndx *hashtab;
	uint32_t *ghashtab;
	int16_t *versym;
	Verdef *verdef;
	Verneed *verneed;
	char *strings;
	struct dso *syms_next, *lazy_next;
	size_t *lazy, lazy_cnt;
	unsigned char *map;
	size_t map_len;
	dev_t dev;
	ino_t ino;
	uint64_t file_offset;
	char relocated;
	char constructed;
	char kernel_mapped;
	char mark;
	char bfs_built;
	char runtime_loaded;
	char by_dlopen;
	struct dso **deps, *needed_by;
	size_t ndeps_direct;
	size_t next_dep;
	int ctor_visitor;
	int nr_dlopen;
	char *rpath_orig, *rpath;
	struct tls_module tls;
	size_t tls_id;
	size_t relro_start, relro_end;
	uintptr_t *new_dtv;
	unsigned char *new_tls;
	struct td_index *td_index;
	struct dso *fini_next;
	char *shortname;
#if DL_FDPIC
	unsigned char *base;
#else
	struct fdpic_loadmap *loadmap;
#endif
	struct funcdesc {
		void *addr;
		size_t *got;
	} *funcdescs;
	size_t *got;
	struct dso **parents;
	size_t parents_count;
	size_t parents_capacity;
	bool is_global;
	bool is_reloc_head_so_dep;
	struct dso **reloc_can_search_dso_list;
	size_t reloc_can_search_dso_count;
	size_t reloc_can_search_dso_capacity;
	bool is_mapped_to_shadow;
	char buf[];
};

struct symdef {
	Sym *sym;
	struct dso *dso;
};

struct fdpic_loadseg {
	uintptr_t addr, p_vaddr, p_memsz;
};

struct fdpic_loadmap {
	unsigned short version, nsegs;
	struct fdpic_loadseg segs[];
};

struct fdpic_dummy_loadmap {
	unsigned short version, nsegs;
	struct fdpic_loadseg segs[1];
};

#include "reloc.h"

#ifndef FDPIC_CONSTDISP_FLAG
#define FDPIC_CONSTDISP_FLAG 0
#endif

#ifndef DL_FDPIC
#define DL_FDPIC 0
#endif

#ifndef DL_NOMMU_SUPPORT
#define DL_NOMMU_SUPPORT 0
#endif

#if !DL_FDPIC
#define IS_RELATIVE(x,s) ( \
	(R_TYPE(x) == REL_RELATIVE) || \
	(R_TYPE(x) == REL_SYM_OR_REL && !R_SYM(x)) )
#else
#define IS_RELATIVE(x,s) ( ( \
	(R_TYPE(x) == REL_FUNCDESC_VAL) || \
	(R_TYPE(x) == REL_SYMBOLIC) ) \
	&& (((s)[R_SYM(x)].st_info & 0xf) == STT_SECTION) )
#endif

#ifndef NEED_MIPS_GOT_RELOCS
#define NEED_MIPS_GOT_RELOCS 0
#endif

#ifndef DT_DEBUG_INDIRECT
#define DT_DEBUG_INDIRECT 0
#endif

#define AUX_CNT 32
#define DYN_CNT 37

#define DT_ANDROID_REL (DT_LOOS + 2)
#define DT_ANDROID_RELSZ (DT_LOOS + 3)

#define DT_ANDROID_RELA (DT_LOOS + 4)
#define DT_ANDROID_RELASZ (DT_LOOS + 5)

#define ANDROID_REL_SIGN_SIZE 4

#define RELOCATION_GROUPED_BY_INFO_FLAG 1
#define RELOCATION_GROUPED_BY_OFFSET_DELTA_FLAG 2
#define RELOCATION_GROUPED_BY_ADDEND_FLAG 4
#define RELOCATION_GROUP_HAS_ADDEND_FLAG 8

typedef void (*stage2_func)(unsigned char *, size_t *);

#if DL_FDPIC
void *laddr(const struct dso *p, size_t v);
#endif

void *addr2dso(size_t a);
struct sym_info_pair gnu_hash(const char *s0);
struct symdef find_sym_impl(
	struct dso *dso, struct verinfo *verinfo, struct sym_info_pair s_info_p, int need_def, ns_t *ns);

hidden void *__dlsym(void *restrict, const char *restrict, void *restrict);
hidden void *__dlvsym(void *restrict, const char *restrict, const char *restrict, void *restrict);
hidden int __dlclose(void *p);

hidden void __dl_seterr(const char *, ...);
hidden int __dl_invalid_handle(void *);
hidden void __dl_vseterr(const char *, va_list);

hidden ptrdiff_t __tlsdesc_static(), __tlsdesc_dynamic();

#endif