summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
Diffstat
-rw-r--r--Makerules9
-rw-r--r--extra/Configs/Config.in28
-rw-r--r--ldso/include/dl-defs.h2
-rw-r--r--ldso/include/dl-elf.h50
-rw-r--r--ldso/include/dl-hash.h33
-rw-r--r--ldso/include/ldso.h9
-rw-r--r--ldso/ldso/Makefile.in8
-rw-r--r--ldso/ldso/dl-debug.c57
-rw-r--r--ldso/ldso/dl-elf.c81
-rw-r--r--ldso/ldso/dl-hash.c90
-rw-r--r--ldso/ldso/dl-startup.c41
-rw-r--r--ldso/ldso/ldso.c452
-rw-r--r--ldso/ldso/sh/elfinterp.c27
-rw-r--r--ldso/libdl/libdl.c59
-rw-r--r--libc/misc/internals/__uClibc_main.c18
15 files changed, 786 insertions, 178 deletions
diff --git a/Makerules b/Makerules
index 2e9ca05bf..435ccfd9e 100644
--- a/Makerules
+++ b/Makerules
@@ -294,6 +294,15 @@ endef
cmd_hcompile.u = $(HOSTCC) $(filter-out $(PHONY),$^) $(DEPS-$(notdir $@)) -o $@ $(BUILD_LDFLAGS) $(BUILD_LDFLAGS-$(notdir $(^D))) $(BUILD_LDFLAGS-$(notdir $@)) $(BUILD_CFLAGS) $(BUILD_CFLAGS-$(notdir $(^D))) $(BUILD_CFLAGS-$(notdir $@))
cmd_hcompile.o = $(HOSTCC) $(filter-out $(PHONY),$<) $(DEPS-$(notdir $@)) -c -o $@ $(BUILD_CFLAGS) $(BUILD_CFLAGS-$(notdir $(^D))) $(BUILD_CFLAGS-$(notdir $@))
+define create-lds
+ $(Q)$(RM) $@.lds
+ $(Q)$(CC) -nostdlib -nostartfiles -shared -Wl,-z,combreloc \
+ -Wl,-z,relro -Wl,--hash-style=gnu -Wl,-z,defs \
+ -Wl,--verbose 2>&1 | LC_ALL=C \
+ sed -e '/^=========/,/^=========/!d;/^=========/d' \
+ -e 's/\. = .* + SIZEOF_HEADERS;/& _begin = . - SIZEOF_HEADERS;/' > $@.lds
+endef
+
define link.so
$(Q)$(RM) $@ $@.$(2) $(dir $@)$(1)
@$(disp_ld)
diff --git a/extra/Configs/Config.in b/extra/Configs/Config.in
index e8d522d71..801669a17 100644
--- a/extra/Configs/Config.in
+++ b/extra/Configs/Config.in
@@ -342,6 +342,34 @@ config LDSO_BASE_FILENAME
WARNING: Changing the default prefix could cause problems with
binutils' ld !
+config LDSO_STANDALONE_SUPPORT
+ bool "Dynamic linker stand-alone mode support"
+ depends on HAVE_SHARED
+ default n
+ help
+ The dynamic linker can be run either indirectly through running some
+ dynamically linked program or library (in which case no command line
+ options to the dynamic linker can be passed and, in the ELF case, the
+ dynamic linker which is stored in the .interp section of the program
+ is executed) or directly by running:
+
+ /lib/ld-uClibc.so.* [OPTIONS] [PROGRAM [ARGUMENTS]]
+
+ Stand-alone execution is a prerequisite for adding prelink
+ capabilities to uClibc dynamic linker, as well useful for testing an
+ updated version of the dynamic linker without breaking the system.
+
+config LDSO_PRELINK_SUPPORT
+ bool "Dynamic linker prelink support"
+ depends on HAVE_SHARED
+ default n
+ select LDSO_STANDALONE_SUPPORT
+ help
+ The dynamic linker can be used in stand-alone mode by the prelink tool
+ for prelinking ELF shared libraries and binaries to speed up startup
+ time. It also is able to load and handle prelinked libraries and
+ binaries at runtime.
+
config UCLIBC_STATIC_LDCONFIG
bool "Link ldconfig statically"
depends on HAVE_SHARED
diff --git a/ldso/include/dl-defs.h b/ldso/include/dl-defs.h
index 2d6303cfe..cbbaa3cea 100644
--- a/ldso/include/dl-defs.h
+++ b/ldso/include/dl-defs.h
@@ -225,7 +225,7 @@ typedef struct {
/* Similar to DL_LOADADDR_UNMAP, but used for libraries that have been
dlopen()ed successfully, when they're dlclose()d. */
#ifndef DL_LIB_UNMAP
-# define DL_LIB_UNMAP(LIB, LEN) (DL_LOADADDR_UNMAP ((LIB)->loadaddr, (LEN)))
+# define DL_LIB_UNMAP(LIB, LEN) (DL_LOADADDR_UNMAP ((LIB)->mapaddr, (LEN)))
#endif
/* Define this to verify that a library named LIBNAME, whose ELF
diff --git a/ldso/include/dl-elf.h b/ldso/include/dl-elf.h
index cbb2100b1..40c88b9da 100644
--- a/ldso/include/dl-elf.h
+++ b/ldso/include/dl-elf.h
@@ -15,6 +15,7 @@
/* Forward declarations for stuff defined in ld_hash.h */
struct dyn_elf;
struct elf_resolve;
+struct r_scope_elem;
#include <dl-defs.h>
#ifdef __LDSO_CACHE_SUPPORT__
@@ -30,16 +31,16 @@ static __inline__ void _dl_unmap_cache(void) { }
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);
+ struct r_scope_elem *scope, unsigned long rel_addr, unsigned long rel_size);
extern struct elf_resolve * _dl_load_shared_library(int secure,
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);
+ struct dyn_elf **rpnt, const char *libname);
extern struct elf_resolve *_dl_check_if_named_library_is_loaded(const char *full_libname,
int trace_loaded_objects);
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);
/*
@@ -84,24 +85,47 @@ 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
+
+#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[],
@@ -150,6 +174,20 @@ unsigned int __dl_parse_dynamic_info(ElfW(Dyn) *dpnt, unsigned long dynamic_info
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 {
diff --git a/ldso/include/dl-hash.h b/ldso/include/dl-hash.h
index 34333f40f..e138e1d4b 100644
--- a/ldso/include/dl-hash.h
+++ b/ldso/include/dl-hash.h
@@ -25,6 +25,19 @@ struct dyn_elf {
struct dyn_elf * prev;
};
+struct sym_val {
+ const ElfW(Sym) *s;
+ struct elf_resolve *m;
+};
+
+/* Structure to describe a single list of scope elements. The lookup
+ functions get passed an array of pointers to such structures. */
+struct r_scope_elem {
+ struct elf_resolve **r_list; /* Array of maps for the scope. */
+ unsigned int r_nlist; /* Number of entries in the scope. */
+ struct r_scope_elem *next;
+};
+
struct elf_resolve {
/* These entries must be in this order to be compatible with the interface used
by gdb to obtain the list of symbols. */
@@ -60,8 +73,13 @@ struct elf_resolve {
#endif
ElfW(Addr) mapaddr;
+#ifdef __LDSO_STANDALONE_SUPPORT__
+ /* Store the entry point from the ELF header (e_entry) */
+ ElfW(Addr) l_entry;
+#endif
enum {elf_lib, elf_executable,program_interpreter, loaded_file} libtype;
- struct dyn_elf * symbol_scope;
+ /* This is the local scope of the shared object */
+ struct r_scope_elem symbol_scope;
unsigned short usage_count;
unsigned short int init_flag;
unsigned long rtld_flags; /* RTLD_GLOBAL, RTLD_NOW etc. */
@@ -128,6 +146,7 @@ struct elf_resolve {
#define INIT_FUNCS_CALLED 0x000004
#define FINI_FUNCS_CALLED 0x000008
#define DL_OPENED 0x000010
+#define DL_RESERVED 0x000020
extern struct dyn_elf * _dl_symbol_tables;
extern struct elf_resolve * _dl_loaded_modules;
@@ -139,17 +158,17 @@ extern struct elf_resolve * _dl_add_elf_hash_table(const char * libname,
/* Only need extra arg with some configurations */
#if !((defined(USE_TLS) && USE_TLS) || defined __FDPIC__)
-# define _dl_lookup_hash(n, r, m, c, t) _dl_lookup_hash(n, r, m, c)
+# define _dl_lookup_hash(n, r, m, s, c, t) _dl_lookup_hash(n, r, m, s, c)
#endif
-extern char *_dl_lookup_hash(const char *name, struct dyn_elf *rpnt,
- struct elf_resolve *mytpnt, int type_class,
+extern char *_dl_lookup_hash(const char *name, struct r_scope_elem *scope,
+ struct elf_resolve *mytpnt, struct sym_val *symbol, int type_class,
struct elf_resolve **tpntp);
-static __always_inline char *_dl_find_hash(const char *name, struct dyn_elf *rpnt,
- struct elf_resolve *mytpnt, int type_class,
+static __always_inline char *_dl_find_hash(const char *name, struct r_scope_elem *scope,
+ struct elf_resolve *mytpnt, struct sym_val *symbol, int type_class,
struct elf_resolve **tpntp)
{
- return _dl_lookup_hash(name, rpnt, mytpnt, type_class, tpntp);
+ return _dl_lookup_hash(name, scope, mytpnt, symbol, type_class, tpntp);
}
extern int _dl_linux_dynamic_link(void);
diff --git a/ldso/include/ldso.h b/ldso/include/ldso.h
index 69b5dd75a..9aa610e7b 100644
--- a/ldso/include/ldso.h
+++ b/ldso/include/ldso.h
@@ -27,6 +27,7 @@
/* Pull in compiler and arch stuff */
#include <stdlib.h>
#include <stdarg.h>
+#include <stddef.h> /* for ptrdiff_t */
#define _FCNTL_H
#include <bits/fcntl.h>
#include <bits/wordsize.h>
@@ -72,6 +73,12 @@ extern char *_dl_preload; /* Things to be loaded before the libs */
extern char *_dl_ldsopath; /* Where the shared lib loader was found */
extern const char *_dl_progname; /* The name of the executable being run */
extern size_t _dl_pagesize; /* Store the page size for use later */
+#ifdef __LDSO_PRELINK_SUPPORT__
+extern char *_dl_trace_prelink; /* Library for prelinking trace */
+extern struct elf_resolve *_dl_trace_prelink_map; /* Library map for prelinking trace */
+#else
+#define _dl_trace_prelink 0
+#endif
#if defined(USE_TLS) && USE_TLS
extern void _dl_add_to_slotinfo (struct link_map *l);
@@ -144,7 +151,7 @@ extern void _dl_dprintf(int, const char *, ...);
# define DL_GET_READY_TO_RUN_EXTRA_ARGS
#endif
-extern void _dl_get_ready_to_run(struct elf_resolve *tpnt, DL_LOADADDR_TYPE load_addr,
+extern void *_dl_get_ready_to_run(struct elf_resolve *tpnt, DL_LOADADDR_TYPE load_addr,
ElfW(auxv_t) auxvt[AT_EGID + 1], char **envp, char **argv
DL_GET_READY_TO_RUN_EXTRA_PARMS);
diff --git a/ldso/ldso/Makefile.in b/ldso/ldso/Makefile.in
index e71ae1563..c9dcebd60 100644
--- a/ldso/ldso/Makefile.in
+++ b/ldso/ldso/Makefile.in
@@ -62,8 +62,16 @@ ldso-y := $($(UCLIBC_LDSO_NAME)_OBJS:.o=.oS)
lib-so-y += $(ldso)
objclean-y += CLEAN_ldso/ldso
+ifeq ($(LDSO_PRELINK_SUPPORT),y)
+# Use a specific linker script for ld.so
+LDFLAGS-$(UCLIBC_LDSO_NAME).so += -T $(ldso:.$(ABI_VERSION)=).lds
+endif
+
$(ldso): $(ldso:.$(ABI_VERSION)=)
$(ldso:.$(ABI_VERSION)=): $($(UCLIBC_LDSO_NAME)_OUT)/$(UCLIBC_LDSO_NAME)_so.a
+ifeq ($(LDSO_PRELINK_SUPPORT),y)
+ $(call create-lds)
+endif
$(call link.so,$(ldso_FULL_NAME),$(ABI_VERSION))
$($(UCLIBC_LDSO_NAME)_OUT)/$(UCLIBC_LDSO_NAME)_so.a: $(ldso-y)
diff --git a/ldso/ldso/dl-debug.c b/ldso/ldso/dl-debug.c
index 7ce8bfbce..47b32316e 100644
--- a/ldso/ldso/dl-debug.c
+++ b/ldso/ldso/dl-debug.c
@@ -104,3 +104,60 @@ static void debug_reloc(ElfW(Sym) *symtab, char *strtab, ELF_RELOC *rpnt)
#define debug_reloc(symtab, strtab, rpnt)
#endif /* __SUPPORT_LD_DEBUG__ */
+
+#ifdef __LDSO_PRELINK_SUPPORT__
+static void
+internal_function
+_dl_debug_lookup (const char *undef_name, struct elf_resolve *undef_map,
+ const ElfW(Sym) *ref, struct sym_val *value, int type_class)
+{
+#ifdef SHARED
+ unsigned long symbol_addr;
+
+ if (_dl_trace_prelink)
+ {
+ int conflict = 0;
+ struct elf_resolve *tls_tpnt = NULL;
+ struct sym_val val = { NULL, NULL };
+
+ if ((_dl_trace_prelink_map == NULL
+ || _dl_trace_prelink_map == _dl_loaded_modules)
+ && undef_map != _dl_loaded_modules)
+ {
+ symbol_addr = (unsigned long)
+ _dl_find_hash(undef_name, &undef_map->symbol_scope,
+ undef_map, &val, type_class, &tls_tpnt);
+
+ if (val.s != value->s || val.m != value->m)
+ conflict = 1;
+ }
+
+ if (value->s
+ && (__builtin_expect (ELF_ST_TYPE(value->s->st_info)
+ == STT_TLS, 0)))
+ type_class = 4;
+
+ if (conflict
+ || _dl_trace_prelink_map == undef_map
+ || _dl_trace_prelink_map == NULL
+ || type_class == 4)
+ {
+ _dl_dprintf (1, "%s %x %x -> %x %x ",
+ conflict ? "conflict" : "lookup",
+ (size_t) undef_map->mapaddr,
+ (size_t) (((ElfW(Addr)) ref) - undef_map->mapaddr),
+ (size_t) (value->m ? value->m->mapaddr : 0),
+ (size_t) (value->s ? value->s->st_value : 0));
+ if (conflict)
+ _dl_dprintf (1, "x %x %x ",
+ (size_t) (val.m ? val.m->mapaddr : 0),
+ (size_t) (val.s ? val.s->st_value : 0));
+ _dl_dprintf (1, "/%x %s\n", type_class, undef_name);
+ }
+}
+#endif
+}
+
+#else
+#define _dl_debug_lookup(undef_name, undef_map, ref, value, type_class)
+#endif
diff --git a/ldso/ldso/dl-elf.c b/ldso/ldso/dl-elf.c
index 5562e0784..d72dd5ae2 100644
--- a/ldso/ldso/dl-elf.c
+++ b/ldso/ldso/dl-elf.c
@@ -322,7 +322,7 @@ goof:
*/
struct elf_resolve *_dl_load_elf_shared_library(int secure,
- struct dyn_elf **rpnt, char *libname)
+ struct dyn_elf **rpnt, const char *libname)
{
ElfW(Ehdr) *epnt;
unsigned long dynamic_addr = 0;
@@ -343,7 +343,7 @@ struct elf_resolve *_dl_load_elf_shared_library(int secure,
size_t relro_size = 0;
struct stat st;
uint32_t *p32;
- DL_LOADADDR_TYPE lib_loadaddr;
+ DL_LOADADDR_TYPE lib_loadaddr = 0;
DL_INIT_LOADADDR_EXTRA_DECLS
libaddr = 0;
@@ -397,11 +397,15 @@ struct elf_resolve *_dl_load_elf_shared_library(int secure,
return NULL;
}
- if ((epnt->e_type != ET_DYN) || (epnt->e_machine != MAGIC1
+ if ((epnt->e_type != ET_DYN
+#ifdef __LDSO_STANDALONE_SUPPORT__
+ && epnt->e_type != ET_EXEC
+#endif
+ ) || (epnt->e_machine != MAGIC1
#ifdef MAGIC2
&& epnt->e_machine != MAGIC2
#endif
- ))
+ ))
{
_dl_internal_error_number =
(epnt->e_type != ET_DYN ? LD_ERROR_NOTDYN : LD_ERROR_NOTMAGIC);
@@ -426,7 +430,7 @@ struct elf_resolve *_dl_load_elf_shared_library(int secure,
if (ppnt->p_type == PT_LOAD) {
/* See if this is a PIC library. */
- if (i == 0 && ppnt->p_vaddr > 0x1000000) {
+ if (minvma == 0xffffffff && ppnt->p_vaddr > 0x1000000) {
piclib = 0;
minvma = ppnt->p_vaddr;
}
@@ -462,14 +466,17 @@ struct elf_resolve *_dl_load_elf_shared_library(int secure,
ppnt++;
}
+#ifdef __LDSO_STANDALONE_SUPPORT__
+ if (epnt->e_type == ET_EXEC)
+ piclib = 0;
+#endif
+
DL_CHECK_LIB_TYPE (epnt, piclib, _dl_progname, libname);
maxvma = (maxvma + ADDR_ALIGN) & PAGE_ALIGN;
minvma = minvma & ~0xffffU;
flags = MAP_PRIVATE /*| MAP_DENYWRITE */ ;
- if (!piclib)
- flags |= MAP_FIXED;
if (piclib == 0 || piclib == 1) {
status = (char *) _dl_mmap((char *) (piclib ? 0 : minvma),
@@ -488,7 +495,7 @@ struct elf_resolve *_dl_load_elf_shared_library(int secure,
/* Get the memory to store the library */
ppnt = (ElfW(Phdr) *)(intptr_t) & header[epnt->e_phoff];
- DL_INIT_LOADADDR(lib_loadaddr, libaddr, ppnt, epnt->e_phnum);
+ DL_INIT_LOADADDR(lib_loadaddr, libaddr - minvma, ppnt, epnt->e_phnum);
for (i = 0; i < epnt->e_phnum; i++) {
if (DL_IS_SPECIAL_SEGMENT (epnt, ppnt)) {
@@ -510,12 +517,6 @@ struct elf_resolve *_dl_load_elf_shared_library(int secure,
char *tryaddr;
ssize_t size;
- /* See if this is a PIC library. */
- if (i == 0 && ppnt->p_vaddr > 0x1000000) {
- piclib = 0;
- /* flags |= MAP_FIXED; */
- }
-
if (ppnt->p_flags & PF_W) {
unsigned long map_size;
char *cpnt;
@@ -559,7 +560,7 @@ struct elf_resolve *_dl_load_elf_shared_library(int secure,
}
tryaddr = piclib == 2 ? piclib2map
- : ((char*) (piclib ? libaddr : 0) +
+ : ((char*) (piclib ? libaddr : lib_loadaddr) +
(ppnt->p_vaddr & PAGE_ALIGN));
size = (ppnt->p_vaddr & ADDR_ALIGN)
@@ -644,7 +645,7 @@ struct elf_resolve *_dl_load_elf_shared_library(int secure,
if (map_size < ppnt->p_vaddr + ppnt->p_memsz
&& !piclib2map) {
- tryaddr = map_size + (char*)(piclib ? libaddr : 0);
+ tryaddr = map_size + (char*)(piclib ? libaddr : lib_loadaddr);
status = (char *) _dl_mmap(tryaddr,
ppnt->p_vaddr + ppnt->p_memsz - map_size,
LXFLAGS(ppnt->p_flags), flags | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
@@ -655,7 +656,7 @@ struct elf_resolve *_dl_load_elf_shared_library(int secure,
} else {
tryaddr = (piclib == 2 ? 0
: (char *) (ppnt->p_vaddr & PAGE_ALIGN)
- + (piclib ? libaddr : 0));
+ + (piclib ? libaddr : lib_loadaddr));
size = (ppnt->p_vaddr & ADDR_ALIGN) + ppnt->p_filesz;
status = (char *) _dl_mmap
(tryaddr, size, LXFLAGS(ppnt->p_flags),
@@ -679,8 +680,11 @@ struct elf_resolve *_dl_load_elf_shared_library(int secure,
}
_dl_close(infile);
- /* For a non-PIC library, the addresses are all absolute */
- if (piclib) {
+ /*
+ * The dynamic_addr must be take into acount lib_loadaddr value, to note
+ * it is zero when the SO has been mapped to the elf's physical addr
+ */
+ if (lib_loadaddr) {
dynamic_addr = (unsigned long) DL_RELOC_ADDR(lib_loadaddr, dynamic_addr);
}
@@ -711,7 +715,7 @@ struct elf_resolve *_dl_load_elf_shared_library(int secure,
ppnt = (ElfW(Phdr) *)(intptr_t) & header[epnt->e_phoff];
for (i = 0; i < epnt->e_phnum; i++, ppnt++) {
if (ppnt->p_type == PT_LOAD && !(ppnt->p_flags & PF_W)) {
- _dl_mprotect((void *) ((piclib ? libaddr : 0) +
+ _dl_mprotect((void *) ((piclib ? libaddr : lib_loadaddr) +
(ppnt->p_vaddr & PAGE_ALIGN)),
(ppnt->p_vaddr & ADDR_ALIGN) + (unsigned long) ppnt->p_filesz,
PROT_READ | PROT_WRITE | PROT_EXEC);
@@ -727,13 +731,17 @@ struct elf_resolve *_dl_load_elf_shared_library(int secure,
tpnt = _dl_add_elf_hash_table(libname, lib_loadaddr, dynamic_info,
dynamic_addr, 0);
+ tpnt->mapaddr = libaddr;
tpnt->relro_addr = relro_addr;
tpnt->relro_size = relro_size;
tpnt->st_dev = st.st_dev;
tpnt->st_ino = st.st_ino;
- tpnt->ppnt = (ElfW(Phdr) *) DL_RELOC_ADDR(tpnt->loadaddr, epnt->e_phoff);
+ tpnt->ppnt = (ElfW(Phdr) *) DL_RELOC_ADDR(tpnt->mapaddr, epnt->e_phoff);
tpnt->n_phent = epnt->e_phnum;
tpnt->rtld_flags |= rtld_flags;
+#ifdef __LDSO_STANDALONE_SUPPORT__
+ tpnt->l_entry = epnt->e_entry;
+#endif
#if defined(USE_TLS) && USE_TLS
if (tlsppnt) {
@@ -755,7 +763,11 @@ struct elf_resolve *_dl_load_elf_shared_library(int secure,
tpnt->l_tls_modid = _dl_next_tls_modid ();
/* We know the load address, so add it to the offset. */
+#ifdef __LDSO_STANDALONE_SUPPORT__
+ if ((tpnt->l_tls_initimage != NULL) && piclib)
+#else
if (tpnt->l_tls_initimage != NULL)
+#endif
{
# ifdef __SUPPORT_LD_DEBUG_EARLY__
unsigned int tmp = (unsigned int) tpnt->l_tls_initimage;
@@ -772,7 +784,12 @@ struct elf_resolve *_dl_load_elf_shared_library(int secure,
/*
* Add this object into the symbol chain
*/
- if (*rpnt) {
+ if (*rpnt
+#ifdef __LDSO_STANDALONE_SUPPORT__
+ /* Do not create a new chain entry for the main executable */
+ && (*rpnt)->dyn
+#endif
+ ) {
(*rpnt)->next = _dl_malloc(sizeof(struct dyn_elf));
_dl_memset((*rpnt)->next, 0, sizeof(struct dyn_elf));
(*rpnt)->next->prev = (*rpnt);
@@ -789,9 +806,12 @@ struct elf_resolve *_dl_load_elf_shared_library(int secure,
}
#endif
(*rpnt)->dyn = tpnt;
- tpnt->symbol_scope = _dl_symbol_tables;
tpnt->usage_count++;
+#ifdef __LDSO_STANDALONE_SUPPORT__
+ tpnt->libtype = (epnt->e_type == ET_DYN) ? elf_lib : elf_executable;
+#else
tpnt->libtype = elf_lib;
+#endif
/*
* OK, the next thing we need to do is to insert the dynamic linker into
@@ -817,7 +837,7 @@ struct elf_resolve *_dl_load_elf_shared_library(int secure,
}
/* now_flag must be RTLD_NOW or zero */
-int _dl_fixup(struct dyn_elf *rpnt, int now_flag)
+int _dl_fixup(struct dyn_elf *rpnt, struct r_scope_elem *scope, int now_flag)
{
int goof = 0;
struct elf_resolve *tpnt;
@@ -825,7 +845,7 @@ int _dl_fixup(struct dyn_elf *rpnt, int now_flag)
ElfW(Addr) reloc_addr;
if (rpnt->next)
- goof = _dl_fixup(rpnt->next, now_flag);
+ goof = _dl_fixup(rpnt->next, scope, now_flag);
if (goof)
return goof;
tpnt = rpnt->dyn;
@@ -852,10 +872,15 @@ int _dl_fixup(struct dyn_elf *rpnt, int now_flag)
relative_count = tpnt->dynamic_info[DT_RELCONT_IDX];
if (relative_count) { /* Optimize the XX_RELATIVE relocations if possible */
reloc_size -= relative_count * sizeof(ELF_RELOC);
- elf_machine_relative(tpnt->loadaddr, reloc_addr, relative_count);
+ if (tpnt->loadaddr
+#ifdef __LDSO_PRELINK_SUPPORT__
+ || (!tpnt->dynamic_info[DT_GNU_PRELINKED_IDX])
+#endif
+ )
+ elf_machine_relative(tpnt->loadaddr, reloc_addr, relative_count);
reloc_addr += relative_count * sizeof(ELF_RELOC);
}
- goof += _dl_parse_relocation_information(rpnt,
+ goof += _dl_parse_relocation_information(rpnt, scope,
reloc_addr,
reloc_size);
tpnt->init_flag |= RELOCS_DONE;
@@ -871,7 +896,7 @@ int _dl_fixup(struct dyn_elf *rpnt, int now_flag)
tpnt->dynamic_info[DT_JMPREL],
tpnt->dynamic_info [DT_PLTRELSZ]);
} else {
- goof += _dl_parse_relocation_information(rpnt,
+ goof += _dl_parse_relocation_information(rpnt, scope,
tpnt->dynamic_info[DT_JMPREL],
tpnt->dynamic_info[DT_PLTRELSZ]);
}
diff --git a/ldso/ldso/dl-hash.c b/ldso/ldso/dl-hash.c
index 0048734ba..bb4c56b04 100644
--- a/ldso/ldso/dl-hash.c
+++ b/ldso/ldso/dl-hash.c
@@ -146,7 +146,6 @@ struct elf_resolve *_dl_add_elf_hash_table(const char *libname,
tpnt->chains = hash_addr;
}
tpnt->loadaddr = loadaddr;
- tpnt->mapaddr = DL_RELOC_ADDR(loadaddr, 0);
for (i = 0; i < DYNAMIC_SIZE; i++)
tpnt->dynamic_info[i] = dynamic_info[i];
return tpnt;
@@ -268,72 +267,81 @@ _dl_lookup_sysv_hash(struct elf_resolve *tpnt, ElfW(Sym) *symtab, unsigned long
* This function resolves externals, and this is either called when we process
* relocations or when we call an entry in the PLT table for the first time.
*/
-char *_dl_lookup_hash(const char *name, struct dyn_elf *rpnt, struct elf_resolve *mytpnt,
- int type_class, struct elf_resolve **tpntp)
+char *_dl_lookup_hash(const char *name, struct r_scope_elem *scope, struct elf_resolve *mytpnt,
+ struct sym_val *symbol, int type_class, struct elf_resolve **tpntp)
{
struct elf_resolve *tpnt = NULL;
ElfW(Sym) *symtab;
+ int i = 0;
unsigned long elf_hash_number = 0xffffffff;
const ElfW(Sym) *sym = NULL;
char *weak_result = NULL;
+ struct r_scope_elem *loop_scope;
#ifdef __LDSO_GNU_HASH_SUPPORT__
unsigned long gnu_hash_number = _dl_gnu_hash((const unsigned char *)name);
#endif
- for (; rpnt; rpnt = rpnt->next) {
- tpnt = rpnt->dyn;
-
- if (!(tpnt->rtld_flags & RTLD_GLOBAL) && mytpnt) {
- if (mytpnt == tpnt)
- ;
- else {
- struct init_fini_list *tmp;
-
- for (tmp = mytpnt->rtld_local; tmp; tmp = tmp->next) {
- if (tmp->tpnt == tpnt)
- break;
+ for (loop_scope = scope; loop_scope && !sym; loop_scope = loop_scope->next) {
+ for (i = 0; i < loop_scope->r_nlist; i++) {
+ tpnt = loop_scope->r_list[i];
+
+ if (!(tpnt->rtld_flags & RTLD_GLOBAL) && mytpnt) {
+ if (mytpnt == tpnt)
+ ;
+ else {
+ struct init_fini_list *tmp;
+
+ for (tmp = mytpnt->rtld_local; tmp; tmp = tmp->next) {
+ if (tmp->tpnt == tpnt)
+ break;
+ }
+ if (!tmp)
+ continue;
}
- if (!tmp)
- continue;
}
- }
- /* Don't search the executable when resolving a copy reloc. */
- if ((type_class & ELF_RTYPE_CLASS_COPY) && tpnt->libtype == elf_executable)
- continue;
+ /* Don't search the executable when resolving a copy reloc. */
+ if ((type_class & ELF_RTYPE_CLASS_COPY) && tpnt->libtype == elf_executable)
+ continue;
- /* If the hash table is empty there is nothing to do here. */
- if (tpnt->nbucket == 0)
- continue;
+ /* If the hash table is empty there is nothing to do here. */
+ if (tpnt->nbucket == 0)
+ continue;
- symtab = (ElfW(Sym) *) (intptr_t) (tpnt->dynamic_info[DT_SYMTAB]);
+ symtab = (ElfW(Sym) *) (intptr_t) (tpnt->dynamic_info[DT_SYMTAB]);
#ifdef __LDSO_GNU_HASH_SUPPORT__
- /* Prefer GNU hash style, if any */
- if (tpnt->l_gnu_bitmask) {
- sym = _dl_lookup_gnu_hash(tpnt, symtab, gnu_hash_number, name, type_class);
- if (sym != NULL)
- /* If sym has been found, do not search further */
- break;
- } else {
+ /* Prefer GNU hash style, if any */
+ if (tpnt->l_gnu_bitmask) {
+ sym = _dl_lookup_gnu_hash(tpnt, symtab, gnu_hash_number, name, type_class);
+ if (sym != NULL)
+ /* If sym has been found, do not search further */
+ break;
+ } else {
#endif
- /* Use the old SysV-style hash table */
+ /* Use the old SysV-style hash table */
- /* Calculate the old sysv hash number only once */
- if (elf_hash_number == 0xffffffff)
- elf_hash_number = _dl_elf_hash((const unsigned char *)name);
+ /* Calculate the old sysv hash number only once */
+ if (elf_hash_number == 0xffffffff)
+ elf_hash_number = _dl_elf_hash((const unsigned char *)name);
- sym = _dl_lookup_sysv_hash(tpnt, symtab, elf_hash_number, name, type_class);
- if (sym != NULL)
- break;
+ sym = _dl_lookup_sysv_hash(tpnt, symtab, elf_hash_number, name, type_class);
+ if (sym != NULL)
+ /* If sym has been found, do not search further */
+ break;
#ifdef __LDSO_GNU_HASH_SUPPORT__
- }
+ }
#endif
- } /* end of for (; rpnt; rpnt = rpnt->next) { */
+ } /* End of inner for */
+ }
if (sym) {
+ if (symbol) {
+ symbol->s = sym;
+ symbol->m = tpnt;
+ }
/* At this point we have found the requested symbol, do binding */
#if defined(USE_TLS) && USE_TLS
if (ELF_ST_TYPE(sym->st_info) == STT_TLS) {
diff --git a/ldso/ldso/dl-startup.c b/ldso/ldso/dl-startup.c
index a51b583a4..4799846ee 100644
--- a/ldso/ldso/dl-startup.c
+++ b/ldso/ldso/dl-startup.c
@@ -94,6 +94,11 @@
/* Pull in all the arch specific stuff */
#include "dl-startup.h"
+#ifdef __LDSO_PRELINK_SUPPORT__
+/* These defined magically in the linker script. */
+extern char _begin[] attribute_hidden;
+#endif
+
/* Static declarations */
static int (*_dl_elf_main) (int, char **, char **);
@@ -164,11 +169,26 @@ DL_START(unsigned long args)
aux_dat += 2;
}
- /* locate the ELF header. We need this done as soon as possible
- * (esp since SEND_STDERR() needs this on some platforms... */
+ /*
+ * Locate the dynamic linker ELF header. We need this done as soon as
+ * possible (esp since SEND_STDERR() needs this on some platforms...
+ */
+
+#ifdef __LDSO_PRELINK_SUPPORT__
+ /*
+ * The `_begin' symbol created by the linker script points to ld.so ELF
+ * We use it if the kernel is not passing a valid address through the auxvt.
+ */
+
+ if (!auxvt[AT_BASE].a_un.a_val)
+ auxvt[AT_BASE].a_un.a_val = (Elf32_Addr) &_begin;
+ /* Note: if the dynamic linker itself is prelinked, the load_addr is 0 */
+ DL_INIT_LOADADDR_BOOT(load_addr, elf_machine_load_address());
+#else
if (!auxvt[AT_BASE].a_un.a_val)
auxvt[AT_BASE].a_un.a_val = elf_machine_load_address();
DL_INIT_LOADADDR_BOOT(load_addr, auxvt[AT_BASE].a_un.a_val);
+#endif
header = (ElfW(Ehdr) *) auxvt[AT_BASE].a_un.a_val;
/* Check the ELF header to make sure everything looks ok. */
@@ -183,7 +203,7 @@ DL_START(unsigned long args)
_dl_exit(0);
}
SEND_EARLY_STDERR_DEBUG("ELF header=");
- SEND_ADDRESS_STDERR_DEBUG(DL_LOADADDR_BASE(load_addr), 1);
+ SEND_ADDRESS_STDERR_DEBUG(DL_LOADADDR_BASE(header), 1);
/* Locate the global offset table. Since this code must be PIC
* we can take advantage of the magic offset register, if we
@@ -192,7 +212,7 @@ DL_START(unsigned long args)
DL_BOOT_COMPUTE_GOT(got);
/* Now, finally, fix up the location of the dynamic stuff */
- DL_BOOT_COMPUTE_DYN(dpnt, got, load_addr);
+ DL_BOOT_COMPUTE_DYN(dpnt, got, (DL_LOADADDR_TYPE)header);
SEND_EARLY_STDERR_DEBUG("First Dynamic section entry=");
SEND_ADDRESS_STDERR_DEBUG(dpnt, 1);
@@ -258,7 +278,12 @@ DL_START(unsigned long args)
if (!indx && relative_count) {
rel_size -= relative_count * sizeof(ELF_RELOC);
- elf_machine_relative(load_addr, rel_addr, relative_count);
+ if (load_addr
+#ifdef __LDSO_PRELINK_SUPPORT__
+ || !tpnt->dynamic_info[DT_GNU_PRELINKED_IDX]
+#endif
+ )
+ elf_machine_relative(load_addr, rel_addr, relative_count);
rel_addr += relative_count * sizeof(ELF_RELOC);
}
@@ -321,12 +346,12 @@ DL_START(unsigned long args)
__rtld_stack_end = (void *)(argv - 1);
- _dl_get_ready_to_run(tpnt, load_addr, auxvt, envp, argv
- DL_GET_READY_TO_RUN_EXTRA_ARGS);
+ _dl_elf_main = (int (*)(int, char **, char **))
+ _dl_get_ready_to_run(tpnt, (DL_LOADADDR_TYPE) header, auxvt, envp, argv
+ DL_GET_READY_TO_RUN_EXTRA_ARGS);
/* Transfer control to the application. */
SEND_STDERR_DEBUG("transfering control to application @ ");
- _dl_elf_main = (int (*)(int, char **, char **)) auxvt[AT_ENTRY].a_un.a_val;
SEND_ADDRESS_STDERR_DEBUG(_dl_elf_main, 1);
#if !defined(START)
diff --git a/ldso/ldso/ldso.c b/ldso/ldso/ldso.c
index ea4ad0f1c..e0d323a9f 100644
--- a/ldso/ldso/ldso.c
+++ b/ldso/ldso/ldso.c
@@ -57,6 +57,12 @@ struct r_debug *_dl_debug_addr = NULL; /* Used to communicate with the gdb debug
void *(*_dl_malloc_function) (size_t size) = NULL;
void (*_dl_free_function) (void *p) = NULL;
+#ifdef __LDSO_PRELINK_SUPPORT__
+char *_dl_trace_prelink = NULL; /* Library for prelinking trace */
+struct elf_resolve *_dl_trace_prelink_map = NULL; /* Library module for prelinking trace */
+bool _dl_verbose = true; /* On by default */
+bool prelinked = false;
+#endif
static int _dl_secure = 1; /* Are we dealing with setuid stuff? */
#ifdef __SUPPORT_LD_DEBUG__
@@ -70,8 +76,18 @@ char *_dl_debug_bindings = NULL;
int _dl_debug_file = 2;
#endif
-/* Needed for standalone execution. */
+#if defined (__LDSO_STANDALONE_SUPPORT__) && defined (__sh__)
+/* Not hidden, needed for standalone execution. */
+/*
+ * FIXME: align dl_start for SH to other archs so that we can keep this symbol
+ * hidden and we don't need to handle in __uClibc_main
+ */
+
+unsigned long _dl_skip_args = 0;
+#else
unsigned long attribute_hidden _dl_skip_args = 0;
+#endif
+
const char *_dl_progname = UCLIBC_LDSO; /* The name of the executable being run */
#include "dl-startup.c"
#include "dl-symbols.c"
@@ -97,6 +113,7 @@ static unsigned char *_dl_malloc_addr = NULL; /* Lets _dl_malloc use the already
static unsigned char *_dl_mmap_zero = NULL; /* Also used by _dl_malloc */
static struct elf_resolve **init_fini_list;
+static struct elf_resolve **scope_elem_list;
static unsigned int nlist; /* # items in init_fini_list */
extern void _start(void);
@@ -274,20 +291,101 @@ static void __attribute__ ((destructor)) __attribute_used__ _dl_fini(void)