| /* Machine-dependent ELF dynamic relocation inline functions. ARM version. |
| Copyright (C) 1995-2018 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 "ARM" |
| |
| #include <sys/param.h> |
| #include <tls.h> |
| #include <dl-tlsdesc.h> |
| #include <dl-irel.h> |
| |
| #ifndef CLEAR_CACHE |
| # error CLEAR_CACHE definition required to handle TEXTREL |
| #endif |
| |
| /* 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_ARM; |
| } |
| |
| |
| /* Return the link-time address of _DYNAMIC. Conveniently, this is the |
| first element of the GOT. */ |
| static inline Elf32_Addr __attribute__ ((unused)) |
| elf_machine_dynamic (void) |
| { |
| /* Declaring this hidden ensures that a PC-relative reference is used. */ |
| 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) |
| { |
| Elf32_Addr pcrel_addr; |
| #ifdef SHARED |
| extern Elf32_Addr __dl_start (void *) asm ("_dl_start"); |
| Elf32_Addr got_addr = (Elf32_Addr) &__dl_start; |
| asm ("adr %0, _dl_start" : "=r" (pcrel_addr)); |
| #else |
| extern Elf32_Addr __dl_relocate_static_pie (void *) |
| asm ("_dl_relocate_static_pie") attribute_hidden; |
| Elf32_Addr got_addr = (Elf32_Addr) &__dl_relocate_static_pie; |
| asm ("adr %0, _dl_relocate_static_pie" : "=r" (pcrel_addr)); |
| #endif |
| #ifdef __thumb__ |
| /* Clear the low bit of the function address. |
| |
| NOTE: got_addr is from GOT table whose lsb is always set by linker if it's |
| Thumb function address. PCREL_ADDR comes from PC-relative calculation |
| which will finish during assembling. GAS assembler before the fix for |
| PR gas/21458 was not setting the lsb but does after that. Always do the |
| strip for both, so the code works with various combinations of glibc and |
| Binutils. */ |
| got_addr &= ~(Elf32_Addr) 1; |
| pcrel_addr &= ~(Elf32_Addr) 1; |
| #endif |
| return pcrel_addr - got_addr; |
| } |
| |
| |
| /* 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)) |
| elf_machine_runtime_setup (struct link_map *l, int lazy, int profile) |
| { |
| Elf32_Addr *got; |
| extern void _dl_runtime_resolve (Elf32_Word); |
| extern void _dl_runtime_profile (Elf32_Word); |
| |
| if (l->l_info[DT_JMPREL] && lazy) |
| { |
| /* patb: this is different than i386 */ |
| /* The GOT entries for functions in the PLT have not yet been filled |
| in. Their initial contents will arrange when called to push an |
| index into the .got section, load ip with &_GLOBAL_OFFSET_TABLE_[3], |
| 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. */ |
| if (got[1]) |
| l->l_mach.plt = got[1] + l->l_addr; |
| 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 (profile) |
| { |
| got[2] = (Elf32_Addr) &_dl_runtime_profile; |
| |
| if (GLRO(dl_profile) != NULL |
| && _dl_name_match_p (GLRO(dl_profile), l)) |
| /* 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; |
| } |
| |
| #if defined(ARCH_HAS_BX) |
| #define BX(x) "bx\t" #x |
| #else |
| #define BX(x) "mov\tpc, " #x |
| #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 ("\ |
| .text\n\ |
| .globl _start\n\ |
| .type _start, %function\n\ |
| .globl _dl_start_user\n\ |
| .type _dl_start_user, %function\n\ |
| _start:\n\ |
| @ we are PIC code, so get global offset table\n\ |
| ldr sl, .L_GET_GOT\n\ |
| @ See if we were run as a command with the executable file\n\ |
| @ name as an extra leading argument.\n\ |
| ldr r4, .L_SKIP_ARGS\n\ |
| @ at start time, all the args are on the stack\n\ |
| mov r0, sp\n\ |
| bl _dl_start\n\ |
| @ returns user entry point in r0\n\ |
| _dl_start_user:\n\ |
| adr r6, .L_GET_GOT\n\ |
| add sl, sl, r6\n\ |
| ldr r4, [sl, r4]\n\ |
| @ save the entry point in another register\n\ |
| mov r6, r0\n\ |
| @ get the original arg count\n\ |
| ldr r1, [sp]\n\ |
| @ get the argv address\n\ |
| add r2, sp, #4\n\ |
| @ Fix up the stack if necessary.\n\ |
| cmp r4, #0\n\ |
| bne .L_fixup_stack\n\ |
| .L_done_fixup:\n\ |
| @ compute envp\n\ |
| add r3, r2, r1, lsl #2\n\ |
| add r3, r3, #4\n\ |
| @ now we call _dl_init\n\ |
| ldr r0, .L_LOADED\n\ |
| ldr r0, [sl, r0]\n\ |
| @ call _dl_init\n\ |
| bl _dl_init(PLT)\n\ |
| @ load the finalizer function\n\ |
| ldr r0, .L_FINI_PROC\n\ |
| add r0, sl, r0\n\ |
| @ jump to the user_s entry point\n\ |
| " BX(r6) "\n\ |
| \n\ |
| @ iWMMXt and EABI targets require the stack to be eight byte\n\ |
| @ aligned - shuffle arguments etc.\n\ |
| .L_fixup_stack:\n\ |
| @ subtract _dl_skip_args from original arg count\n\ |
| sub r1, r1, r4\n\ |
| @ store the new argc in the new stack location\n\ |
| str r1, [sp]\n\ |
| @ find the first unskipped argument\n\ |
| mov r3, r2\n\ |
| add r4, r2, r4, lsl #2\n\ |
| @ shuffle argv down\n\ |
| 1: ldr r5, [r4], #4\n\ |
| str r5, [r3], #4\n\ |
| cmp r5, #0\n\ |
| bne 1b\n\ |
| @ shuffle envp down\n\ |
| 1: ldr r5, [r4], #4\n\ |
| str r5, [r3], #4\n\ |
| cmp r5, #0\n\ |
| bne 1b\n\ |
| @ shuffle auxv down\n\ |
| 1: ldmia r4!, {r0, r5}\n\ |
| stmia r3!, {r0, r5}\n\ |
| cmp r0, #0\n\ |
| bne 1b\n\ |
| @ Update _dl_argv\n\ |
| ldr r3, .L_ARGV\n\ |
| str r2, [sl, r3]\n\ |
| b .L_done_fixup\n\ |
| \n\ |
| .L_GET_GOT:\n\ |
| .word _GLOBAL_OFFSET_TABLE_ - .L_GET_GOT\n\ |
| .L_SKIP_ARGS:\n\ |
| .word _dl_skip_args(GOTOFF)\n\ |
| .L_FINI_PROC:\n\ |
| .word _dl_fini(GOTOFF)\n\ |
| .L_ARGV:\n\ |
| .word _dl_argv(GOTOFF)\n\ |
| .L_LOADED:\n\ |
| .word _rtld_local(GOTOFF)\n\ |
| .previous\n\ |
| "); |
| |
| /* 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 against |
| protected data whose address may be external due to copy relocation. */ |
| #ifndef RTLD_BOOTSTRAP |
| # define elf_machine_type_class(type) \ |
| ((((type) == R_ARM_JUMP_SLOT || (type) == R_ARM_TLS_DTPMOD32 \ |
| || (type) == R_ARM_TLS_DTPOFF32 || (type) == R_ARM_TLS_TPOFF32 \ |
| || (type) == R_ARM_TLS_DESC) \ |
| * ELF_RTYPE_CLASS_PLT) \ |
| | (((type) == R_ARM_COPY) * ELF_RTYPE_CLASS_COPY) \ |
| | (((type) == R_ARM_GLOB_DAT) * ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA)) |
| #else |
| #define elf_machine_type_class(type) \ |
| ((((type) == R_ARM_JUMP_SLOT) * ELF_RTYPE_CLASS_PLT) \ |
| | (((type) == R_ARM_COPY) * ELF_RTYPE_CLASS_COPY) \ |
| | (((type) == R_ARM_GLOB_DAT) * ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA)) |
| #endif |
| |
| /* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */ |
| #define ELF_MACHINE_JMP_SLOT R_ARM_JUMP_SLOT |
| |
| /* ARM 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 ElfW(Sym) *refsym, const ElfW(Sym) *sym, |
| 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; |
| } |
| |
| #endif /* !dl_machine_h */ |
| |
| |
| /* ARM 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 |
| |
| /* Names of the architecture-specific auditing callback functions. */ |
| #define ARCH_LA_PLTENTER arm_gnu_pltenter |
| #define ARCH_LA_PLTEXIT arm_gnu_pltexit |
| |
| #ifdef RESOLVE_MAP |
| /* Handle a PC24 reloc, including the out-of-range case. */ |
| auto void |
| relocate_pc24 (struct link_map *map, Elf32_Addr value, |
| Elf32_Addr *const reloc_addr, Elf32_Sword addend) |
| { |
| Elf32_Addr new_value; |
| |
| /* Set NEW_VALUE based on V, and return true iff it overflows 24 bits. */ |
| inline bool set_new_value (Elf32_Addr v) |
| { |
| new_value = v + addend - (Elf32_Addr) reloc_addr; |
| Elf32_Addr topbits = new_value & 0xfe000000; |
| return topbits != 0xfe000000 && topbits != 0x00000000; |
| } |
| |
| if (set_new_value (value)) |
| { |
| /* The PC-relative address doesn't fit in 24 bits! */ |
| |
| static void *fix_page; |
| static size_t fix_offset; |
| if (fix_page == NULL) |
| { |
| void *new_page = __mmap (NULL, GLRO(dl_pagesize), |
| PROT_READ | PROT_WRITE | PROT_EXEC, |
| MAP_PRIVATE | MAP_ANON, -1, 0); |
| if (new_page == MAP_FAILED) |
| _dl_signal_error (0, map->l_name, NULL, |
| "could not map page for fixup"); |
| fix_page = new_page; |
| assert (fix_offset == 0); |
| } |
| |
| Elf32_Word *fix_address = fix_page + fix_offset; |
| fix_address[0] = 0xe51ff004; /* ldr pc, [pc, #-4] */ |
| fix_address[1] = value; |
| |
| fix_offset += sizeof fix_address[0] * 2; |
| if (fix_offset >= GLRO(dl_pagesize)) |
| { |
| fix_page = NULL; |
| fix_offset = 0; |
| } |
| |
| if (set_new_value ((Elf32_Addr) fix_address)) |
| _dl_signal_error (0, map->l_name, NULL, |
| "R_ARM_PC24 relocation out of range"); |
| } |
| |
| *reloc_addr = (*reloc_addr & 0xff000000) | ((new_value >> 2) & 0x00ffffff); |
| } |
| |
| /* 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 (__builtin_expect (r_type == R_ARM_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_ARM_NONE, 0)) |
| return; |
| # endif |
| else |
| #endif |
| { |
| 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) |
| && __builtin_expect (!skip_ifunc, 1)) |
| value = elf_ifunc_invoke (value); |
| |
| switch (r_type) |
| { |
| case R_ARM_COPY: |
| if (sym == NULL) |
| /* This can happen in trace mode if an object could not be |
| found. */ |
| break; |
| if (sym->st_size > refsym->st_size |
| || (GLRO(dl_verbose) && sym->st_size < refsym->st_size)) |
| { |
| const char *strtab; |
| |
| strtab = (const void *) 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_ARM_GLOB_DAT: |
| case R_ARM_JUMP_SLOT: |
| # ifdef RTLD_BOOTSTRAP |
| /* Fix weak undefined references. */ |
| if (sym != NULL && sym->st_value == 0) |
| *reloc_addr = 0; |
| else |
| # endif |
| *reloc_addr = value; |
| break; |
| case R_ARM_ABS32: |
| { |
| struct unaligned |
| { |
| Elf32_Addr x; |
| } __attribute__ ((packed, may_alias)); |
| # ifndef RTLD_BOOTSTRAP |
| /* 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)) |
| /* Undo the relocation done here during bootstrapping. |
| Now we will relocate it anew, possibly using a |
| binding found in the user program or a loaded library |
| rather than the dynamic linker's built-in definitions |
| used while loading those libraries. */ |
| value -= map->l_addr + refsym->st_value; |
| # endif |
| /* Support relocations on mis-aligned offsets. */ |
| ((struct unaligned *) reloc_addr)->x += value; |
| break; |
| } |
| case R_ARM_TLS_DESC: |
| { |
| struct tlsdesc *td = (struct tlsdesc *)reloc_addr; |
| |
| # ifndef RTLD_BOOTSTRAP |
| if (! sym) |
| td->entry = _dl_tlsdesc_undefweak; |
| else |
| # endif |
| { |
| if (ELF32_R_SYM (reloc->r_info) == STN_UNDEF) |
| value = td->argument.value; |
| else |
| value = sym->st_value; |
| |
| # ifndef RTLD_BOOTSTRAP |
| # ifndef SHARED |
| CHECK_STATIC_TLS (map, sym_map); |
| # else |
| if (!TRY_STATIC_TLS (map, sym_map)) |
| { |
| td->argument.pointer |
| = _dl_make_tlsdesc_dynamic (sym_map, value); |
| td->entry = _dl_tlsdesc_dynamic; |
| } |
| else |
| # endif |
| # endif |
| { |
| td->argument.value = value + sym_map->l_tls_offset; |
| td->entry = _dl_tlsdesc_return; |
| } |
| } |
| } |
| break; |
| case R_ARM_PC24: |
| relocate_pc24 (map, value, reloc_addr, |
| /* Sign-extend the 24-bit addend in the |
| instruction (which counts instructions), and |
| then shift it up two so as to count bytes. */ |
| (((Elf32_Sword) *reloc_addr << 8) >> 8) << 2); |
| break; |
| #if !defined RTLD_BOOTSTRAP |
| case R_ARM_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_ARM_TLS_DTPOFF32: |
| if (sym != NULL) |
| *reloc_addr += sym->st_value; |
| break; |
| |
| case R_ARM_TLS_TPOFF32: |
| if (sym != NULL) |
| { |
| CHECK_STATIC_TLS (map, sym_map); |
| *reloc_addr += sym->st_value + sym_map->l_tls_offset; |
| } |
| break; |
| case R_ARM_IRELATIVE: |
| value = map->l_addr + *reloc_addr; |
| value = ((Elf32_Addr (*) (int)) value) (GLRO(dl_hwcap)); |
| *reloc_addr = value; |
| break; |
| #endif |
| default: |
| _dl_reloc_bad_type (map, r_type, 0); |
| break; |
| } |
| } |
| } |
| |
| # 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 (__builtin_expect (r_type == R_ARM_RELATIVE, 0)) |
| *reloc_addr = map->l_addr + reloc->r_addend; |
| else if (__builtin_expect (r_type == R_ARM_NONE, 0)) |
| return; |
| else |
| { |
| # 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_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)) |
| value = elf_ifunc_invoke (value); |
| |
| switch (r_type) |
| { |
| # ifndef RESOLVE_CONFLICT_FIND_MAP |
| /* Not needed for dl-conflict.c. */ |
| case R_ARM_COPY: |
| if (sym == NULL) |
| /* This can happen in trace mode if an object could not be |
| found. */ |
| break; |
| if (sym->st_size > refsym->st_size |
| || (GLRO(dl_verbose) && sym->st_size < refsym->st_size)) |
| { |
| const char *strtab; |
| |
| strtab = (const void *) 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_ARM_GLOB_DAT: |
| case R_ARM_JUMP_SLOT: |
| case R_ARM_ABS32: |
| *reloc_addr = value + reloc->r_addend; |
| break; |
| case R_ARM_PC24: |
| relocate_pc24 (map, value, reloc_addr, reloc->r_addend); |
| break; |
| #if !defined RTLD_BOOTSTRAP |
| case R_ARM_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_ARM_TLS_DTPOFF32: |
| *reloc_addr = (sym == NULL ? 0 : sym->st_value) + reloc->r_addend; |
| break; |
| |
| case R_ARM_TLS_TPOFF32: |
| 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_ARM_IRELATIVE: |
| value = map->l_addr + reloc->r_addend; |
| value = ((Elf32_Addr (*) (int)) value) (GLRO(dl_hwcap)); |
| *reloc_addr = value; |
| break; |
| #endif |
| default: |
| _dl_reloc_bad_type (map, r_type, 0); |
| break; |
| } |
| } |
| } |
| # endif |
| |
| 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; |
| *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 |
| |
| 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 (__builtin_expect (r_type == R_ARM_JUMP_SLOT, 1)) |
| { |
| if (__builtin_expect (map->l_mach.plt, 0) == 0) |
| *reloc_addr += l_addr; |
| else |
| *reloc_addr = map->l_mach.plt; |
| } |
| else if (__builtin_expect (r_type == R_ARM_TLS_DESC, 1)) |
| { |
| const Elf_Symndx symndx = ELFW (R_SYM) (reloc->r_info); |
| const ElfW (Sym) *symtab = (const void *)D_PTR (map, l_info[DT_SYMTAB]); |
| const ElfW (Sym) *sym = &symtab[symndx]; |
| const struct r_found_version *version = NULL; |
| |
| if (map->l_info[VERSYMIDX (DT_VERSYM)] != NULL) |
| { |
| const ElfW (Half) *vernum = |
| (const void *)D_PTR (map, l_info[VERSYMIDX (DT_VERSYM)]); |
| version = &map->l_versions[vernum[symndx] & 0x7fff]; |
| } |
| |
| /* Always initialize TLS descriptors completely, because lazy |
| initialization requires synchronization at every TLS access. */ |
| elf_machine_rel (map, reloc, sym, version, reloc_addr, skip_ifunc); |
| } |
| else |
| _dl_reloc_bad_type (map, r_type, 1); |
| } |
| |
| #endif /* RESOLVE_MAP */ |