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Diffstat (limited to 'sysdeps/aarch64/dl-machine.h')
| -rw-r--r-- | sysdeps/aarch64/dl-machine.h | 447 |
1 files changed, 0 insertions, 447 deletions
diff --git a/sysdeps/aarch64/dl-machine.h b/sysdeps/aarch64/dl-machine.h deleted file mode 100644 index 15d79a6961..0000000000 --- a/sysdeps/aarch64/dl-machine.h +++ /dev/null @@ -1,447 +0,0 @@ -/* 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 "aarch64" - -#include <sysdep.h> -#include <tls.h> -#include <dl-tlsdesc.h> -#include <dl-irel.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 ElfW(Ehdr) *ehdr) -{ - return ehdr->e_machine == EM_AARCH64; -} - -/* Return the link-time address of _DYNAMIC. Conveniently, this is the - first element of the GOT. */ -static inline ElfW(Addr) __attribute__ ((unused)) -elf_machine_dynamic (void) -{ - extern const ElfW(Addr) _GLOBAL_OFFSET_TABLE_[] attribute_hidden; - return _GLOBAL_OFFSET_TABLE_[0]; -} - -/* Return the run-time load address of the shared object. */ - -static inline ElfW(Addr) __attribute__ ((unused)) -elf_machine_load_address (void) -{ - /* To figure out the load address we use the definition that for any symbol: - dynamic_addr(symbol) = static_addr(symbol) + load_addr - - The choice of symbol is arbitrary. The static address we obtain - by constructing a non GOT reference to the symbol, the dynamic - address of the symbol we compute using adrp/add to compute the - symbol's address relative to the PC. - This depends on 32/16bit relocations being resolved at link time - and that the static address fits in the 32/16 bits. */ - - ElfW(Addr) static_addr; - ElfW(Addr) dynamic_addr; - - asm (" \n" -" adrp %1, _dl_start; \n" -#ifdef __LP64__ -" add %1, %1, #:lo12:_dl_start \n" -#else -" add %w1, %w1, #:lo12:_dl_start \n" -#endif -" ldr %w0, 1f \n" -" b 2f \n" -"1: \n" -#ifdef __LP64__ -" .word _dl_start \n" -#else -# ifdef __AARCH64EB__ -" .short 0 \n" -# endif -" .short _dl_start \n" -# ifndef __AARCH64EB__ -" .short 0 \n" -# endif -#endif -"2: \n" - : "=r" (static_addr), "=r" (dynamic_addr)); - return dynamic_addr - static_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) -{ - if (l->l_info[DT_JMPREL] && lazy) - { - ElfW(Addr) *got; - extern void _dl_runtime_resolve (ElfW(Word)); - extern void _dl_runtime_profile (ElfW(Word)); - - got = (ElfW(Addr) *) D_PTR (l, l_info[DT_PLTGOT]); - if (got[1]) - { - l->l_mach.plt = got[1] + l->l_addr; - } - got[1] = (ElfW(Addr)) l; - - /* 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] = (ElfW(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] = (ElfW(Addr)) &_dl_runtime_resolve; - } - } - - if (l->l_info[ADDRIDX (DT_TLSDESC_GOT)] && lazy) - *(ElfW(Addr)*)(D_PTR (l, l_info[ADDRIDX (DT_TLSDESC_GOT)]) + l->l_addr) - = (ElfW(Addr)) &_dl_tlsdesc_resolve_rela; - - return lazy; -} - -/* Initial entry point for the dynamic linker. The C function - _dl_start is the real entry point, its return value is the user - program's entry point */ -#ifdef __LP64__ -# define RTLD_START RTLD_START_1 ("x", "3", "sp") -#else -# define RTLD_START RTLD_START_1 ("w", "2", "wsp") -#endif - - -#define RTLD_START_1(PTR, PTR_SIZE_LOG, PTR_SP) asm ("\ -.text \n\ -.globl _start \n\ -.type _start, %function \n\ -.globl _dl_start_user \n\ -.type _dl_start_user, %function \n\ -_start: \n\ - mov " PTR "0, " PTR_SP " \n\ - bl _dl_start \n\ - // returns user entry point in x0 \n\ - mov x21, x0 \n\ -_dl_start_user: \n\ - // get the original arg count \n\ - ldr " PTR "1, [sp] \n\ - // get the argv address \n\ - add " PTR "2, " PTR_SP ", #(1<<" PTR_SIZE_LOG ") \n\ - // get _dl_skip_args to see if we were \n\ - // invoked as an executable \n\ - adrp x4, _dl_skip_args \n\ - ldr w4, [x4, #:lo12:_dl_skip_args] \n\ - // do we need to adjust argc/argv \n\ - cmp w4, 0 \n\ - beq .L_done_stack_adjust \n\ - // subtract _dl_skip_args from original arg count \n\ - sub " PTR "1, " PTR "1, " PTR "4 \n\ - // store adjusted argc back to stack \n\ - str " PTR "1, [sp] \n\ - // find the first unskipped argument \n\ - mov " PTR "3, " PTR "2 \n\ - add " PTR "4, " PTR "2, " PTR "4, lsl #" PTR_SIZE_LOG " \n\ - // shuffle argv down \n\ -1: ldr " PTR "5, [x4], #(1<<" PTR_SIZE_LOG ") \n\ - str " PTR "5, [x3], #(1<<" PTR_SIZE_LOG ") \n\ - cmp " PTR "5, #0 \n\ - bne 1b \n\ - // shuffle envp down \n\ -1: ldr " PTR "5, [x4], #(1<<" PTR_SIZE_LOG ") \n\ - str " PTR "5, [x3], #(1<<" PTR_SIZE_LOG ") \n\ - cmp " PTR "5, #0 \n\ - bne 1b \n\ - // shuffle auxv down \n\ -1: ldp " PTR "0, " PTR "5, [x4, #(2<<" PTR_SIZE_LOG ")]! \n\ - stp " PTR "0, " PTR "5, [x3], #(2<<" PTR_SIZE_LOG ") \n\ - cmp " PTR "0, #0 \n\ - bne 1b \n\ - // Update _dl_argv \n\ - adrp x3, _dl_argv \n\ - str " PTR "2, [x3, #:lo12:_dl_argv] \n\ -.L_done_stack_adjust: \n\ - // compute envp \n\ - add " PTR "3, " PTR "2, " PTR "1, lsl #" PTR_SIZE_LOG " \n\ - add " PTR "3, " PTR "3, #(1<<" PTR_SIZE_LOG ") \n\ - adrp x16, _rtld_local \n\ - add " PTR "16, " PTR "16, #:lo12:_rtld_local \n\ - ldr " PTR "0, [x16] \n\ - bl _dl_init \n\ - // load the finalizer function \n\ - adrp x0, _dl_fini \n\ - add " PTR "0, " PTR "0, #:lo12:_dl_fini \n\ - // jump to the user_s entry point \n\ - br x21 \n\ -"); - -#define elf_machine_type_class(type) \ - ((((type) == AARCH64_R(JUMP_SLOT) \ - || (type) == AARCH64_R(TLS_DTPMOD) \ - || (type) == AARCH64_R(TLS_DTPREL) \ - || (type) == AARCH64_R(TLS_TPREL) \ - || (type) == AARCH64_R(TLSDESC)) * ELF_RTYPE_CLASS_PLT) \ - | (((type) == AARCH64_R(COPY)) * ELF_RTYPE_CLASS_COPY) \ - | (((type) == AARCH64_R(GLOB_DAT)) * ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA)) - -#define ELF_MACHINE_JMP_SLOT AARCH64_R(JUMP_SLOT) - -/* AArch64 uses RELA not REL */ -#define ELF_MACHINE_NO_REL 1 -#define ELF_MACHINE_NO_RELA 0 - -#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; - -#ifdef SHARED - /* init_cpu_features has been called early from __libc_start_main in - static executable. */ - init_cpu_features (&GLRO(dl_aarch64_cpu_features)); -#endif -} - - -static inline ElfW(Addr) -elf_machine_fixup_plt (struct link_map *map, lookup_t t, - const ElfW(Rela) *reloc, - ElfW(Addr) *reloc_addr, - ElfW(Addr) value) -{ - return *reloc_addr = value; -} - -/* Return the final value of a plt relocation. */ -static inline ElfW(Addr) -elf_machine_plt_value (struct link_map *map, - const ElfW(Rela) *reloc, - ElfW(Addr) value) -{ - return value; -} - -#endif - -/* Names of the architecture-specific auditing callback functions. */ -#define ARCH_LA_PLTENTER aarch64_gnu_pltenter -#define ARCH_LA_PLTEXIT aarch64_gnu_pltexit - -#ifdef RESOLVE_MAP - -auto inline void -__attribute__ ((always_inline)) -elf_machine_rela (struct link_map *map, const ElfW(Rela) *reloc, - const ElfW(Sym) *sym, const struct r_found_version *version, - void *const reloc_addr_arg, int skip_ifunc) -{ - ElfW(Addr) *const reloc_addr = reloc_addr_arg; - const unsigned int r_type = ELFW (R_TYPE) (reloc->r_info); - - if (__builtin_expect (r_type == AARCH64_R(RELATIVE), 0)) - *reloc_addr = map->l_addr + reloc->r_addend; - else if (__builtin_expect (r_type == R_AARCH64_NONE, 0)) - return; - else - { - const ElfW(Sym) *const refsym = sym; - struct link_map *sym_map = RESOLVE_MAP (&sym, version, r_type); - ElfW(Addr) value = sym_map == NULL ? 0 : sym_map->l_addr + sym->st_value; - - if (sym != NULL - && __glibc_unlikely (ELFW(ST_TYPE) (sym->st_info) == STT_GNU_IFUNC) - && __glibc_likely (sym->st_shndx != SHN_UNDEF) - && __glibc_likely (!skip_ifunc)) - value = elf_ifunc_invoke (value); - - switch (r_type) - { - case AARCH64_R(COPY): - if (sym == NULL) - 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 AARCH64_R(RELATIVE): - case AARCH64_R(GLOB_DAT): - case AARCH64_R(JUMP_SLOT): - case AARCH64_R(ABS32): -#ifdef __LP64__ - case AARCH64_R(ABS64): -#endif - *reloc_addr = value + reloc->r_addend; - break; - - case AARCH64_R(TLSDESC): - { - 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 AARCH64_R(TLS_DTPMOD): -#ifdef RTLD_BOOTSTRAP - *reloc_addr = 1; -#else - if (sym_map != NULL) - { - *reloc_addr = sym_map->l_tls_modid; - } -#endif - break; - - case AARCH64_R(TLS_DTPREL): - if (sym) - *reloc_addr = sym->st_value + reloc->r_addend; - break; - - case AARCH64_R(TLS_TPREL): - if (sym) - { - CHECK_STATIC_TLS (map, sym_map); - *reloc_addr = - sym->st_value + reloc->r_addend + sym_map->l_tls_offset; - } - break; - - case AARCH64_R(IRELATIVE): - value = map->l_addr + reloc->r_addend; - value = elf_ifunc_invoke (value); - *reloc_addr = value; - break; - - default: - _dl_reloc_bad_type (map, r_type, 0); - break; - } - } -} - -inline void -__attribute__ ((always_inline)) -elf_machine_rela_relative (ElfW(Addr) l_addr, - const ElfW(Rela) *reloc, - void *const reloc_addr_arg) -{ - ElfW(Addr) *const reloc_addr = reloc_addr_arg; - *reloc_addr = l_addr + reloc->r_addend; -} - -inline void -__attribute__ ((always_inline)) -elf_machine_lazy_rel (struct link_map *map, - ElfW(Addr) l_addr, - const ElfW(Rela) *reloc, - int skip_ifunc) -{ - ElfW(Addr) *const reloc_addr = (void *) (l_addr + reloc->r_offset); - const unsigned int r_type = ELFW (R_TYPE) (reloc->r_info); - /* Check for unexpected PLT reloc type. */ - if (__builtin_expect (r_type == AARCH64_R(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 == AARCH64_R(TLSDESC), 1)) - { - struct tlsdesc volatile *td = - (struct tlsdesc volatile *)reloc_addr; - - td->arg = (void*)reloc; - td->entry = (void*)(D_PTR (map, l_info[ADDRIDX (DT_TLSDESC_PLT)]) - + map->l_addr); - } - else if (__glibc_unlikely (r_type == AARCH64_R(IRELATIVE))) - { - ElfW(Addr) value = map->l_addr + reloc->r_addend; - if (__glibc_likely (!skip_ifunc)) - value = elf_ifunc_invoke (value); - *reloc_addr = value; - } - else - _dl_reloc_bad_type (map, r_type, 1); -} - -#endif |