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Diffstat (limited to 'sysdeps/i386/dl-machine.h')
| -rw-r--r-- | sysdeps/i386/dl-machine.h | 757 |
1 files changed, 0 insertions, 757 deletions
diff --git a/sysdeps/i386/dl-machine.h b/sysdeps/i386/dl-machine.h deleted file mode 100644 index 57d4a0bdbd..0000000000 --- a/sysdeps/i386/dl-machine.h +++ /dev/null @@ -1,757 +0,0 @@ -/* Machine-dependent ELF dynamic relocation inline functions. i386 version. - Copyright (C) 1995-2017 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, see - <http://www.gnu.org/licenses/>. */ - -#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> -#include <cpu-features.c> - -/* 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; -} - - -/* 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 (); -} - -/* 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 (__glibc_unlikely (profile)) - { - 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 - -# ifndef PROF -/* 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. */ -#define ARCH_FIXUP_ATTRIBUTE __attribute__ ((regparm (3), stdcall, unused)) - -extern ElfW(Addr) _dl_fixup (struct link_map *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\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_COPY iff TYPE should not be allowed to resolve to one - of the main executable's symbols, as for a COPY reloc. - ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA iff TYPE describes relocation may - against protected data whose address be external due to copy relocation. - */ -# 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) \ - | (((type) == R_386_GLOB_DAT) * ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA)) - -/* 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 IS_IN (rtld) - /* init_cpu_features has been called early from __libc_start_main in - static executable. */ - init_cpu_features (&GLRO(dl_x86_cpu_features)); -#else - if (GLRO(dl_platform) != NULL && *GLRO(dl_platform) == '\0') - /* Avoid an empty string which would disturb us. */ - GLRO(dl_platform) = NULL; -#endif -} - -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 -#define ELF_MACHINE_NO_REL 0 - -#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, int skip_ifunc) -{ - 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 (__glibc_unlikely (r_type == R_386_RELATIVE)) - { -# 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 (__glibc_unlikely (r_type == R_386_NONE)) - return; -# endif - else -# endif /* !RTLD_BOOTSTRAP and have no -z combreloc */ - { -# ifndef RTLD_BOOTSTRAP - const Elf32_Sym *const refsym = sym; -# endif - 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) - && __builtin_expect (!skip_ifunc, 1)) - { -# ifndef RTLD_BOOTSTRAP - if (sym_map != map - && sym_map->l_type != lt_executable - && !sym_map->l_relocated) - { - const char *strtab - = (const char *) D_PTR (map, l_info[DT_STRTAB]); - _dl_error_printf ("\ -%s: Relink `%s' with `%s' for IFUNC symbol `%s'\n", - RTLD_PROGNAME, map->l_name, - sym_map->l_name, - strtab + refsym->st_name); - } -# endif - value = ((Elf32_Addr (*) (void)) value) (); - } - - switch (r_type) - { -# ifndef RTLD_BOOTSTRAP - case R_386_SIZE32: - /* Set to symbol size plus addend. */ - *reloc_addr += sym->st_size; - break; -# endif - case R_386_GLOB_DAT: - case R_386_JMP_SLOT: - *reloc_addr = value; - break; - - 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; - -# 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, 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, int skip_ifunc) -{ - 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) - && __builtin_expect (!skip_ifunc, 1)) - value = ((Elf32_Addr (*) (void)) value) (); - - switch (ELF32_R_TYPE (reloc->r_info)) - { - case R_386_SIZE32: - /* Set to symbol size plus addend. */ - value = sym->st_size; - 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, 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, - int skip_ifunc) -{ - 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 (__glibc_likely (r_type == R_386_JMP_SLOT)) - { - 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 (__glibc_likely (r_type == R_386_TLS_DESC)) - { - 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), skip_ifunc); - } -# ifndef RTLD_BOOTSTRAP - else - elf_machine_rel (map, r, &symtab[ELFW(R_SYM) (r->r_info)], NULL, - (void *) (l_addr + r->r_offset), skip_ifunc); -# endif - } - } - else if (__glibc_unlikely (r_type == R_386_IRELATIVE)) - { - Elf32_Addr value = map->l_addr + *reloc_addr; - if (__glibc_likely (!skip_ifunc)) - 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, - int skip_ifunc) -{ - Elf32_Addr *const reloc_addr = (void *) (l_addr + reloc->r_offset); - const unsigned int r_type = ELF32_R_TYPE (reloc->r_info); - if (__glibc_likely (r_type == R_386_JMP_SLOT)) - ; - else if (__glibc_likely (r_type == R_386_TLS_DESC)) - { - struct tlsdesc volatile * __attribute__((__unused__)) td = - (struct tlsdesc volatile *)reloc_addr; - - td->arg = (void*)reloc; - td->entry = _dl_tlsdesc_resolve_rela; - } - else if (__glibc_unlikely (r_type == R_386_IRELATIVE)) - { - Elf32_Addr value = map->l_addr + reloc->r_addend; - if (__glibc_likely (!skip_ifunc)) - value = ((Elf32_Addr (*) (void)) value) (); - *reloc_addr = value; - } - else - _dl_reloc_bad_type (map, r_type, 1); -} - -# endif /* !RTLD_BOOTSTRAP */ - -#endif /* RESOLVE_MAP */ |