| /* Machine-dependent ELF dynamic relocation inline functions. i386 version. |
| Copyright (C) 1995-2005, 2006, 2009 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #ifndef dl_machine_h |
| #define dl_machine_h |
| |
| #define ELF_MACHINE_NAME "i386" |
| |
| #include <sys/param.h> |
| #include <sysdep.h> |
| #include <tls.h> |
| #include <dl-tlsdesc.h> |
| |
| /* Return nonzero iff ELF header is compatible with the running host. */ |
| static inline int __attribute__ ((unused)) |
| elf_machine_matches_host (const Elf32_Ehdr *ehdr) |
| { |
| return ehdr->e_machine == EM_386; |
| } |
| |
| |
| #ifdef PI_STATIC_AND_HIDDEN |
| |
| /* Return the link-time address of _DYNAMIC. Conveniently, this is the |
| first element of the GOT, a special entry that is never relocated. */ |
| static inline Elf32_Addr __attribute__ ((unused, const)) |
| elf_machine_dynamic (void) |
| { |
| /* This produces a GOTOFF reloc that resolves to zero at link time, so in |
| fact just loads from the GOT register directly. By doing it without |
| an asm we can let the compiler choose any register. */ |
| extern const Elf32_Addr _GLOBAL_OFFSET_TABLE_[] attribute_hidden; |
| return _GLOBAL_OFFSET_TABLE_[0]; |
| } |
| |
| /* Return the run-time load address of the shared object. */ |
| static inline Elf32_Addr __attribute__ ((unused)) |
| elf_machine_load_address (void) |
| { |
| /* Compute the difference between the runtime address of _DYNAMIC as seen |
| by a GOTOFF reference, and the link-time address found in the special |
| unrelocated first GOT entry. */ |
| extern Elf32_Dyn bygotoff[] asm ("_DYNAMIC") attribute_hidden; |
| return (Elf32_Addr) &bygotoff - elf_machine_dynamic (); |
| } |
| |
| #else /* Without .hidden support, we can't compile the code above. */ |
| |
| /* Return the link-time address of _DYNAMIC. Conveniently, this is the |
| first element of the GOT. This must be inlined in a function which |
| uses global data. */ |
| static inline Elf32_Addr __attribute__ ((unused)) |
| elf_machine_dynamic (void) |
| { |
| register Elf32_Addr *got asm ("%ebx"); |
| return *got; |
| } |
| |
| |
| /* Return the run-time load address of the shared object. */ |
| static inline Elf32_Addr __attribute__ ((unused)) |
| elf_machine_load_address (void) |
| { |
| /* It doesn't matter what variable this is, the reference never makes |
| it to assembly. We need a dummy reference to some global variable |
| via the GOT to make sure the compiler initialized %ebx in time. */ |
| extern int _dl_argc; |
| Elf32_Addr addr; |
| asm ("leal _dl_start@GOTOFF(%%ebx), %0\n" |
| "subl _dl_start@GOT(%%ebx), %0" |
| : "=r" (addr) : "m" (_dl_argc) : "cc"); |
| return addr; |
| } |
| |
| #endif |
| |
| |
| /* Set up the loaded object described by L so its unrelocated PLT |
| entries will jump to the on-demand fixup code in dl-runtime.c. */ |
| |
| static inline int __attribute__ ((unused, always_inline)) |
| elf_machine_runtime_setup (struct link_map *l, int lazy, int profile) |
| { |
| Elf32_Addr *got; |
| extern void _dl_runtime_resolve (Elf32_Word) attribute_hidden; |
| extern void _dl_runtime_profile (Elf32_Word) attribute_hidden; |
| |
| if (l->l_info[DT_JMPREL] && lazy) |
| { |
| /* The GOT entries for functions in the PLT have not yet been filled |
| in. Their initial contents will arrange when called to push an |
| offset into the .rel.plt section, push _GLOBAL_OFFSET_TABLE_[1], |
| and then jump to _GLOBAL_OFFSET_TABLE[2]. */ |
| got = (Elf32_Addr *) D_PTR (l, l_info[DT_PLTGOT]); |
| /* If a library is prelinked but we have to relocate anyway, |
| we have to be able to undo the prelinking of .got.plt. |
| The prelinker saved us here address of .plt + 0x16. */ |
| if (got[1]) |
| { |
| l->l_mach.plt = got[1] + l->l_addr; |
| l->l_mach.gotplt = (Elf32_Addr) &got[3]; |
| } |
| got[1] = (Elf32_Addr) l; /* Identify this shared object. */ |
| |
| /* The got[2] entry contains the address of a function which gets |
| called to get the address of a so far unresolved function and |
| jump to it. The profiling extension of the dynamic linker allows |
| to intercept the calls to collect information. In this case we |
| don't store the address in the GOT so that all future calls also |
| end in this function. */ |
| if (__builtin_expect (profile, 0)) |
| { |
| got[2] = (Elf32_Addr) &_dl_runtime_profile; |
| |
| if (GLRO(dl_profile) != NULL |
| && _dl_name_match_p (GLRO(dl_profile), l)) |
| /* This is the object we are looking for. Say that we really |
| want profiling and the timers are started. */ |
| GL(dl_profile_map) = l; |
| } |
| else |
| /* This function will get called to fix up the GOT entry indicated by |
| the offset on the stack, and then jump to the resolved address. */ |
| got[2] = (Elf32_Addr) &_dl_runtime_resolve; |
| } |
| |
| return lazy; |
| } |
| |
| #ifdef IN_DL_RUNTIME |
| |
| # if !defined PROF && !__BOUNDED_POINTERS__ |
| /* We add a declaration of this function here so that in dl-runtime.c |
| the ELF_MACHINE_RUNTIME_TRAMPOLINE macro really can pass the parameters |
| in registers. |
| |
| We cannot use this scheme for profiling because the _mcount call |
| destroys the passed register information. */ |
| /* GKM FIXME: Fix trampoline to pass bounds so we can do |
| without the `__unbounded' qualifier. */ |
| #define ARCH_FIXUP_ATTRIBUTE __attribute__ ((regparm (3), stdcall, unused)) |
| |
| extern ElfW(Addr) _dl_fixup (struct link_map *__unbounded l, |
| ElfW(Word) reloc_offset) |
| ARCH_FIXUP_ATTRIBUTE; |
| extern ElfW(Addr) _dl_profile_fixup (struct link_map *l, |
| ElfW(Word) reloc_offset, |
| ElfW(Addr) retaddr, void *regs, |
| long int *framesizep) |
| ARCH_FIXUP_ATTRIBUTE; |
| # endif |
| |
| #endif |
| |
| /* Mask identifying addresses reserved for the user program, |
| where the dynamic linker should not map anything. */ |
| #define ELF_MACHINE_USER_ADDRESS_MASK 0xf8000000UL |
| |
| /* Initial entry point code for the dynamic linker. |
| The C function `_dl_start' is the real entry point; |
| its return value is the user program's entry point. */ |
| |
| #define RTLD_START asm ("\n\ |
| .text\n\ |
| .align 16\n\ |
| 0: movl (%esp), %ebx\n\ |
| ret\n\ |
| .align 16\n\ |
| .globl _start\n\ |
| .globl _dl_start_user\n\ |
| _start:\n\ |
| # Note that _dl_start gets the parameter in %eax.\n\ |
| movl %esp, %eax\n\ |
| call _dl_start\n\ |
| _dl_start_user:\n\ |
| # Save the user entry point address in %edi.\n\ |
| movl %eax, %edi\n\ |
| # Point %ebx at the GOT.\n\ |
| call 0b\n\ |
| addl $_GLOBAL_OFFSET_TABLE_, %ebx\n\ |
| # See if we were run as a command with the executable file\n\ |
| # name as an extra leading argument.\n\ |
| movl _dl_skip_args@GOTOFF(%ebx), %eax\n\ |
| # Pop the original argument count.\n\ |
| popl %edx\n\ |
| # Adjust the stack pointer to skip _dl_skip_args words.\n\ |
| leal (%esp,%eax,4), %esp\n\ |
| # Subtract _dl_skip_args from argc.\n\ |
| subl %eax, %edx\n\ |
| # Push argc back on the stack.\n\ |
| push %edx\n\ |
| # The special initializer gets called with the stack just\n\ |
| # as the application's entry point will see it; it can\n\ |
| # switch stacks if it moves these contents over.\n\ |
| " RTLD_START_SPECIAL_INIT "\n\ |
| # Load the parameters again.\n\ |
| # (eax, edx, ecx, *--esp) = (_dl_loaded, argc, argv, envp)\n\ |
| movl _rtld_local@GOTOFF(%ebx), %eax\n\ |
| leal 8(%esp,%edx,4), %esi\n\ |
| leal 4(%esp), %ecx\n\ |
| movl %esp, %ebp\n\ |
| # Make sure _dl_init is run with 16 byte aligned stack.\n\ |
| andl $-16, %esp\n\ |
| pushl %eax\n\ |
| pushl %eax\n\ |
| pushl %ebp\n\ |
| pushl %esi\n\ |
| # Clear %ebp, so that even constructors have terminated backchain.\n\ |
| xorl %ebp, %ebp\n\ |
| # Call the function to run the initializers.\n\ |
| call _dl_init_internal@PLT\n\ |
| # Pass our finalizer function to the user in %edx, as per ELF ABI.\n\ |
| leal _dl_fini@GOTOFF(%ebx), %edx\n\ |
| # Restore %esp _start expects.\n\ |
| movl (%esp), %esp\n\ |
| # Jump to the user's entry point.\n\ |
| jmp *%edi\n\ |
| .previous\n\ |
| "); |
| |
| #ifndef RTLD_START_SPECIAL_INIT |
| # define RTLD_START_SPECIAL_INIT /* nothing */ |
| #endif |
| |
| /* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry or |
| TLS variable, so undefined references should not be allowed to |
| define the value. |
| ELF_RTYPE_CLASS_NOCOPY iff TYPE should not be allowed to resolve to one |
| of the main executable's symbols, as for a COPY reloc. */ |
| #if !defined RTLD_BOOTSTRAP || USE___THREAD |
| # define elf_machine_type_class(type) \ |
| ((((type) == R_386_JMP_SLOT || (type) == R_386_TLS_DTPMOD32 \ |
| || (type) == R_386_TLS_DTPOFF32 || (type) == R_386_TLS_TPOFF32 \ |
| || (type) == R_386_TLS_TPOFF || (type) == R_386_TLS_DESC) \ |
| * ELF_RTYPE_CLASS_PLT) \ |
| | (((type) == R_386_COPY) * ELF_RTYPE_CLASS_COPY)) |
| #else |
| # define elf_machine_type_class(type) \ |
| ((((type) == R_386_JMP_SLOT) * ELF_RTYPE_CLASS_PLT) \ |
| | (((type) == R_386_COPY) * ELF_RTYPE_CLASS_COPY)) |
| #endif |
| |
| /* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */ |
| #define ELF_MACHINE_JMP_SLOT R_386_JMP_SLOT |
| |
| /* The i386 never uses Elf32_Rela relocations for the dynamic linker. |
| Prelinked libraries may use Elf32_Rela though. */ |
| #define ELF_MACHINE_PLT_REL 1 |
| |
| /* We define an initialization functions. This is called very early in |
| _dl_sysdep_start. */ |
| #define DL_PLATFORM_INIT dl_platform_init () |
| |
| static inline void __attribute__ ((unused)) |
| dl_platform_init (void) |
| { |
| if (GLRO(dl_platform) != NULL && *GLRO(dl_platform) == '\0') |
| /* Avoid an empty string which would disturb us. */ |
| GLRO(dl_platform) = NULL; |
| } |
| |
| static inline Elf32_Addr |
| elf_machine_fixup_plt (struct link_map *map, lookup_t t, |
| const Elf32_Rel *reloc, |
| Elf32_Addr *reloc_addr, Elf32_Addr value) |
| { |
| return *reloc_addr = value; |
| } |
| |
| /* Return the final value of a plt relocation. */ |
| static inline Elf32_Addr |
| elf_machine_plt_value (struct link_map *map, const Elf32_Rel *reloc, |
| Elf32_Addr value) |
| { |
| return value; |
| } |
| |
| |
| /* Names of the architecture-specific auditing callback functions. */ |
| #define ARCH_LA_PLTENTER i86_gnu_pltenter |
| #define ARCH_LA_PLTEXIT i86_gnu_pltexit |
| |
| #endif /* !dl_machine_h */ |
| |
| /* The i386 never uses Elf32_Rela relocations for the dynamic linker. |
| Prelinked libraries may use Elf32_Rela though. */ |
| #define ELF_MACHINE_NO_RELA defined RTLD_BOOTSTRAP |
| |
| #ifdef RESOLVE_MAP |
| |
| /* Perform the relocation specified by RELOC and SYM (which is fully resolved). |
| MAP is the object containing the reloc. */ |
| |
| auto inline void |
| __attribute ((always_inline)) |
| elf_machine_rel (struct link_map *map, const Elf32_Rel *reloc, |
| const Elf32_Sym *sym, const struct r_found_version *version, |
| void *const reloc_addr_arg) |
| { |
| Elf32_Addr *const reloc_addr = reloc_addr_arg; |
| const unsigned int r_type = ELF32_R_TYPE (reloc->r_info); |
| |
| # if !defined RTLD_BOOTSTRAP || !defined HAVE_Z_COMBRELOC |
| if (__builtin_expect (r_type == R_386_RELATIVE, 0)) |
| { |
| # if !defined RTLD_BOOTSTRAP && !defined HAVE_Z_COMBRELOC |
| /* This is defined in rtld.c, but nowhere in the static libc.a; |
| make the reference weak so static programs can still link. |
| This declaration cannot be done when compiling rtld.c |
| (i.e. #ifdef RTLD_BOOTSTRAP) because rtld.c contains the |
| common defn for _dl_rtld_map, which is incompatible with a |
| weak decl in the same file. */ |
| # ifndef SHARED |
| weak_extern (_dl_rtld_map); |
| # endif |
| if (map != &GL(dl_rtld_map)) /* Already done in rtld itself. */ |
| # endif |
| *reloc_addr += map->l_addr; |
| } |
| # ifndef RTLD_BOOTSTRAP |
| else if (__builtin_expect (r_type == R_386_NONE, 0)) |
| return; |
| # endif |
| else |
| # endif /* !RTLD_BOOTSTRAP and have no -z combreloc */ |
| { |
| const Elf32_Sym *const refsym = sym; |
| struct link_map *sym_map = RESOLVE_MAP (&sym, version, r_type); |
| Elf32_Addr value = sym_map == NULL ? 0 : sym_map->l_addr + sym->st_value; |
| |
| if (sym != NULL |
| && __builtin_expect (ELFW(ST_TYPE) (sym->st_info) == STT_GNU_IFUNC, |
| 0) |
| && __builtin_expect (sym->st_shndx != SHN_UNDEF, 1)) |
| value = ((Elf32_Addr (*) (void)) value) (); |
| |
| switch (r_type) |
| { |
| case R_386_GLOB_DAT: |
| case R_386_JMP_SLOT: |
| *reloc_addr = value; |
| break; |
| |
| # if !defined RTLD_BOOTSTRAP || USE___THREAD |
| case R_386_TLS_DTPMOD32: |
| # ifdef RTLD_BOOTSTRAP |
| /* During startup the dynamic linker is always the module |
| with index 1. |
| XXX If this relocation is necessary move before RESOLVE |
| call. */ |
| *reloc_addr = 1; |
| # else |
| /* Get the information from the link map returned by the |
| resolv function. */ |
| if (sym_map != NULL) |
| *reloc_addr = sym_map->l_tls_modid; |
| # endif |
| break; |
| case R_386_TLS_DTPOFF32: |
| # ifndef RTLD_BOOTSTRAP |
| /* During relocation all TLS symbols are defined and used. |
| Therefore the offset is already correct. */ |
| if (sym != NULL) |
| *reloc_addr = sym->st_value; |
| # endif |
| break; |
| case R_386_TLS_DESC: |
| { |
| struct tlsdesc volatile *td = |
| (struct tlsdesc volatile *)reloc_addr; |
| |
| # ifndef RTLD_BOOTSTRAP |
| if (! sym) |
| td->entry = _dl_tlsdesc_undefweak; |
| else |
| # endif |
| { |
| # ifndef RTLD_BOOTSTRAP |
| # ifndef SHARED |
| CHECK_STATIC_TLS (map, sym_map); |
| # else |
| if (!TRY_STATIC_TLS (map, sym_map)) |
| { |
| td->arg = _dl_make_tlsdesc_dynamic |
| (sym_map, sym->st_value + (ElfW(Word))td->arg); |
| td->entry = _dl_tlsdesc_dynamic; |
| } |
| else |
| # endif |
| # endif |
| { |
| td->arg = (void*)(sym->st_value - sym_map->l_tls_offset |
| + (ElfW(Word))td->arg); |
| td->entry = _dl_tlsdesc_return; |
| } |
| } |
| break; |
| } |
| case R_386_TLS_TPOFF32: |
| /* The offset is positive, backward from the thread pointer. */ |
| # ifdef RTLD_BOOTSTRAP |
| *reloc_addr += map->l_tls_offset - sym->st_value; |
| # else |
| /* We know the offset of object the symbol is contained in. |
| It is a positive value which will be subtracted from the |
| thread pointer. To get the variable position in the TLS |
| block we subtract the offset from that of the TLS block. */ |
| if (sym != NULL) |
| { |
| CHECK_STATIC_TLS (map, sym_map); |
| *reloc_addr += sym_map->l_tls_offset - sym->st_value; |
| } |
| # endif |
| break; |
| case R_386_TLS_TPOFF: |
| /* The offset is negative, forward from the thread pointer. */ |
| # ifdef RTLD_BOOTSTRAP |
| *reloc_addr += sym->st_value - map->l_tls_offset; |
| # else |
| /* We know the offset of object the symbol is contained in. |
| It is a negative value which will be added to the |
| thread pointer. */ |
| if (sym != NULL) |
| { |
| CHECK_STATIC_TLS (map, sym_map); |
| *reloc_addr += sym->st_value - sym_map->l_tls_offset; |
| } |
| # endif |
| break; |
| # endif /* use TLS */ |
| |
| # ifndef RTLD_BOOTSTRAP |
| case R_386_32: |
| *reloc_addr += value; |
| break; |
| case R_386_PC32: |
| *reloc_addr += (value - (Elf32_Addr) reloc_addr); |
| break; |
| case R_386_COPY: |
| if (sym == NULL) |
| /* This can happen in trace mode if an object could not be |
| found. */ |
| break; |
| if (__builtin_expect (sym->st_size > refsym->st_size, 0) |
| || (__builtin_expect (sym->st_size < refsym->st_size, 0) |
| && GLRO(dl_verbose))) |
| { |
| const char *strtab; |
| |
| strtab = (const char *) D_PTR (map, l_info[DT_STRTAB]); |
| _dl_error_printf ("\ |
| %s: Symbol `%s' has different size in shared object, consider re-linking\n", |
| rtld_progname ?: "<program name unknown>", |
| strtab + refsym->st_name); |
| } |
| memcpy (reloc_addr_arg, (void *) value, |
| MIN (sym->st_size, refsym->st_size)); |
| break; |
| case R_386_IRELATIVE: |
| value = map->l_addr + *reloc_addr; |
| value = ((Elf32_Addr (*) (void)) value) (); |
| *reloc_addr = value; |
| break; |
| default: |
| _dl_reloc_bad_type (map, r_type, 0); |
| break; |
| # endif /* !RTLD_BOOTSTRAP */ |
| } |
| } |
| } |
| |
| # ifndef RTLD_BOOTSTRAP |
| auto inline void |
| __attribute__ ((always_inline)) |
| elf_machine_rela (struct link_map *map, const Elf32_Rela *reloc, |
| const Elf32_Sym *sym, const struct r_found_version *version, |
| void *const reloc_addr_arg) |
| { |
| Elf32_Addr *const reloc_addr = reloc_addr_arg; |
| const unsigned int r_type = ELF32_R_TYPE (reloc->r_info); |
| |
| if (ELF32_R_TYPE (reloc->r_info) == R_386_RELATIVE) |
| *reloc_addr = map->l_addr + reloc->r_addend; |
| else if (r_type != R_386_NONE) |
| { |
| # ifndef RESOLVE_CONFLICT_FIND_MAP |
| const Elf32_Sym *const refsym = sym; |
| # endif |
| struct link_map *sym_map = RESOLVE_MAP (&sym, version, r_type); |
| Elf32_Addr value = sym == NULL ? 0 : sym_map->l_addr + sym->st_value; |
| |
| if (sym != NULL |
| && __builtin_expect (sym->st_shndx != SHN_UNDEF, 1) |
| && __builtin_expect (ELFW(ST_TYPE) (sym->st_info) == STT_GNU_IFUNC, |
| 0)) |
| value = ((Elf32_Addr (*) (void)) value) (); |
| |
| switch (ELF32_R_TYPE (reloc->r_info)) |
| { |
| case R_386_GLOB_DAT: |
| case R_386_JMP_SLOT: |
| case R_386_32: |
| *reloc_addr = value + reloc->r_addend; |
| break; |
| # ifndef RESOLVE_CONFLICT_FIND_MAP |
| /* Not needed for dl-conflict.c. */ |
| case R_386_PC32: |
| *reloc_addr = (value + reloc->r_addend - (Elf32_Addr) reloc_addr); |
| break; |
| |
| case R_386_TLS_DTPMOD32: |
| /* Get the information from the link map returned by the |
| resolv function. */ |
| if (sym_map != NULL) |
| *reloc_addr = sym_map->l_tls_modid; |
| break; |
| case R_386_TLS_DTPOFF32: |
| /* During relocation all TLS symbols are defined and used. |
| Therefore the offset is already correct. */ |
| *reloc_addr = (sym == NULL ? 0 : sym->st_value) + reloc->r_addend; |
| break; |
| case R_386_TLS_DESC: |
| { |
| struct tlsdesc volatile *td = |
| (struct tlsdesc volatile *)reloc_addr; |
| |
| # ifndef RTLD_BOOTSTRAP |
| if (!sym) |
| { |
| td->arg = (void*)reloc->r_addend; |
| td->entry = _dl_tlsdesc_undefweak; |
| } |
| else |
| # endif |
| { |
| # ifndef RTLD_BOOTSTRAP |
| # ifndef SHARED |
| CHECK_STATIC_TLS (map, sym_map); |
| # else |
| if (!TRY_STATIC_TLS (map, sym_map)) |
| { |
| td->arg = _dl_make_tlsdesc_dynamic |
| (sym_map, sym->st_value + reloc->r_addend); |
| td->entry = _dl_tlsdesc_dynamic; |
| } |
| else |
| # endif |
| # endif |
| { |
| td->arg = (void*)(sym->st_value - sym_map->l_tls_offset |
| + reloc->r_addend); |
| td->entry = _dl_tlsdesc_return; |
| } |
| } |
| } |
| break; |
| case R_386_TLS_TPOFF32: |
| /* The offset is positive, backward from the thread pointer. */ |
| /* We know the offset of object the symbol is contained in. |
| It is a positive value which will be subtracted from the |
| thread pointer. To get the variable position in the TLS |
| block we subtract the offset from that of the TLS block. */ |
| if (sym != NULL) |
| { |
| CHECK_STATIC_TLS (map, sym_map); |
| *reloc_addr = sym_map->l_tls_offset - sym->st_value |
| + reloc->r_addend; |
| } |
| break; |
| case R_386_TLS_TPOFF: |
| /* The offset is negative, forward from the thread pointer. */ |
| /* We know the offset of object the symbol is contained in. |
| It is a negative value which will be added to the |
| thread pointer. */ |
| if (sym != NULL) |
| { |
| CHECK_STATIC_TLS (map, sym_map); |
| *reloc_addr = sym->st_value - sym_map->l_tls_offset |
| + reloc->r_addend; |
| } |
| break; |
| case R_386_COPY: |
| if (sym == NULL) |
| /* This can happen in trace mode if an object could not be |
| found. */ |
| break; |
| if (__builtin_expect (sym->st_size > refsym->st_size, 0) |
| || (__builtin_expect (sym->st_size < refsym->st_size, 0) |
| && GLRO(dl_verbose))) |
| { |
| const char *strtab; |
| |
| strtab = (const char *) D_PTR (map, l_info[DT_STRTAB]); |
| _dl_error_printf ("\ |
| %s: Symbol `%s' has different size in shared object, consider re-linking\n", |
| rtld_progname ?: "<program name unknown>", |
| strtab + refsym->st_name); |
| } |
| memcpy (reloc_addr_arg, (void *) value, |
| MIN (sym->st_size, refsym->st_size)); |
| break; |
| # endif /* !RESOLVE_CONFLICT_FIND_MAP */ |
| case R_386_IRELATIVE: |
| value = map->l_addr + reloc->r_addend; |
| value = ((Elf32_Addr (*) (void)) value) (); |
| *reloc_addr = value; |
| break; |
| default: |
| /* We add these checks in the version to relocate ld.so only |
| if we are still debugging. */ |
| _dl_reloc_bad_type (map, r_type, 0); |
| break; |
| } |
| } |
| } |
| # endif /* !RTLD_BOOTSTRAP */ |
| |
| auto inline void |
| __attribute ((always_inline)) |
| elf_machine_rel_relative (Elf32_Addr l_addr, const Elf32_Rel *reloc, |
| void *const reloc_addr_arg) |
| { |
| Elf32_Addr *const reloc_addr = reloc_addr_arg; |
| assert (ELF32_R_TYPE (reloc->r_info) == R_386_RELATIVE); |
| *reloc_addr += l_addr; |
| } |
| |
| # ifndef RTLD_BOOTSTRAP |
| auto inline void |
| __attribute__ ((always_inline)) |
| elf_machine_rela_relative (Elf32_Addr l_addr, const Elf32_Rela *reloc, |
| void *const reloc_addr_arg) |
| { |
| Elf32_Addr *const reloc_addr = reloc_addr_arg; |
| *reloc_addr = l_addr + reloc->r_addend; |
| } |
| # endif /* !RTLD_BOOTSTRAP */ |
| |
| auto inline void |
| __attribute__ ((always_inline)) |
| elf_machine_lazy_rel (struct link_map *map, |
| Elf32_Addr l_addr, const Elf32_Rel *reloc) |
| { |
| Elf32_Addr *const reloc_addr = (void *) (l_addr + reloc->r_offset); |
| const unsigned int r_type = ELF32_R_TYPE (reloc->r_info); |
| /* Check for unexpected PLT reloc type. */ |
| if (__builtin_expect (r_type == R_386_JMP_SLOT, 1)) |
| { |
| if (__builtin_expect (map->l_mach.plt, 0) == 0) |
| *reloc_addr += l_addr; |
| else |
| *reloc_addr = (map->l_mach.plt |
| + (((Elf32_Addr) reloc_addr) - map->l_mach.gotplt) * 4); |
| } |
| else if (__builtin_expect (r_type == R_386_TLS_DESC, 1)) |
| { |
| struct tlsdesc volatile * __attribute__((__unused__)) td = |
| (struct tlsdesc volatile *)reloc_addr; |
| |
| /* Handle relocations that reference the local *ABS* in a simple |
| way, so as to preserve a potential addend. */ |
| if (ELF32_R_SYM (reloc->r_info) == 0) |
| td->entry = _dl_tlsdesc_resolve_abs_plus_addend; |
| /* Given a known-zero addend, we can store a pointer to the |
| reloc in the arg position. */ |
| else if (td->arg == 0) |
| { |
| td->arg = (void*)reloc; |
| td->entry = _dl_tlsdesc_resolve_rel; |
| } |
| else |
| { |
| /* We could handle non-*ABS* relocations with non-zero addends |
| by allocating dynamically an arg to hold a pointer to the |
| reloc, but that sounds pointless. */ |
| const Elf32_Rel *const r = reloc; |
| /* The code below was borrowed from elf_dynamic_do_rel(). */ |
| const ElfW(Sym) *const symtab = |
| (const void *) D_PTR (map, l_info[DT_SYMTAB]); |
| |
| # ifdef RTLD_BOOTSTRAP |
| /* The dynamic linker always uses versioning. */ |
| assert (map->l_info[VERSYMIDX (DT_VERSYM)] != NULL); |
| # else |
| if (map->l_info[VERSYMIDX (DT_VERSYM)]) |
| # endif |
| { |
| const ElfW(Half) *const version = |
| (const void *) D_PTR (map, l_info[VERSYMIDX (DT_VERSYM)]); |
| ElfW(Half) ndx = version[ELFW(R_SYM) (r->r_info)] & 0x7fff; |
| elf_machine_rel (map, r, &symtab[ELFW(R_SYM) (r->r_info)], |
| &map->l_versions[ndx], |
| (void *) (l_addr + r->r_offset)); |
| } |
| # ifndef RTLD_BOOTSTRAP |
| else |
| elf_machine_rel (map, r, &symtab[ELFW(R_SYM) (r->r_info)], NULL, |
| (void *) (l_addr + r->r_offset)); |
| # endif |
| } |
| } |
| else if (__builtin_expect (r_type == R_386_IRELATIVE, 0)) |
| { |
| Elf32_Addr value = map->l_addr + *reloc_addr; |
| value = ((Elf32_Addr (*) (void)) value) (); |
| *reloc_addr = value; |
| } |
| else |
| _dl_reloc_bad_type (map, r_type, 1); |
| } |
| |
| # ifndef RTLD_BOOTSTRAP |
| |
| auto inline void |
| __attribute__ ((always_inline)) |
| elf_machine_lazy_rela (struct link_map *map, |
| Elf32_Addr l_addr, const Elf32_Rela *reloc) |
| { |
| Elf32_Addr *const reloc_addr = (void *) (l_addr + reloc->r_offset); |
| const unsigned int r_type = ELF32_R_TYPE (reloc->r_info); |
| if (__builtin_expect (r_type == R_386_JMP_SLOT, 1)) |
| ; |
| else if (__builtin_expect (r_type == R_386_TLS_DESC, 1)) |
| { |
| struct tlsdesc volatile * __attribute__((__unused__)) td = |
| (struct tlsdesc volatile *)reloc_addr; |
| |
| td->arg = (void*)reloc; |
| td->entry = _dl_tlsdesc_resolve_rela; |
| } |
| else if (__builtin_expect (r_type == R_386_IRELATIVE, 0)) |
| { |
| Elf32_Addr value = map->l_addr + reloc->r_addend; |
| value = ((Elf32_Addr (*) (void)) value) (); |
| *reloc_addr = value; |
| } |
| else |
| _dl_reloc_bad_type (map, r_type, 1); |
| } |
| |
| # endif /* !RTLD_BOOTSTRAP */ |
| |
| #endif /* RESOLVE_MAP */ |