diff options
Diffstat (limited to 'ldso/ldso/dl-startup.c')
| -rw-r--r-- | ldso/ldso/dl-startup.c | 41 |
1 files changed, 33 insertions, 8 deletions
diff --git a/ldso/ldso/dl-startup.c b/ldso/ldso/dl-startup.c index 449266077..fa7972d90 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) |