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/* Copyright (C) 1995-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef dl_machine_h
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#define dl_machine_h
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#define ELF_MACHINE_NAME "aarch64"
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#include <sysdep.h>
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#include <tls.h>
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#include <dl-tlsdesc.h>
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#include <dl-irel.h>
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#include <cpu-features.c>
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/* Return nonzero iff ELF header is compatible with the running host. */
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static inline int __attribute__ ((unused))
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elf_machine_matches_host (const ElfW(Ehdr) *ehdr)
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{
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return ehdr->e_machine == EM_AARCH64;
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}
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/* Return the link-time address of _DYNAMIC. Conveniently, this is the
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first element of the GOT. */
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static inline ElfW(Addr) __attribute__ ((unused))
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elf_machine_dynamic (void)
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{
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extern const ElfW(Addr) _GLOBAL_OFFSET_TABLE_[] attribute_hidden;
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return _GLOBAL_OFFSET_TABLE_[0];
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}
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/* Return the run-time load address of the shared object. */
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static inline ElfW(Addr) __attribute__ ((unused))
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elf_machine_load_address (void)
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{
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/* To figure out the load address we use the definition that for any symbol:
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dynamic_addr(symbol) = static_addr(symbol) + load_addr
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_DYNAMIC sysmbol is used here as its link-time address stored in
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the special unrelocated first GOT entry. */
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extern ElfW(Dyn) _DYNAMIC[] attribute_hidden;
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return (ElfW(Addr)) &_DYNAMIC - elf_machine_dynamic ();
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}
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/* Set up the loaded object described by L so its unrelocated PLT
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entries will jump to the on-demand fixup code in dl-runtime.c. */
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static inline int __attribute__ ((unused))
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elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
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{
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if (l->l_info[DT_JMPREL] && lazy)
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{
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ElfW(Addr) *got;
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extern void _dl_runtime_resolve (ElfW(Word));
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extern void _dl_runtime_profile (ElfW(Word));
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got = (ElfW(Addr) *) D_PTR (l, l_info[DT_PLTGOT]);
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if (got[1])
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{
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l->l_mach.plt = got[1] + l->l_addr;
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}
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got[1] = (ElfW(Addr)) l;
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/* The got[2] entry contains the address of a function which gets
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called to get the address of a so far unresolved function and
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jump to it. The profiling extension of the dynamic linker allows
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to intercept the calls to collect information. In this case we
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don't store the address in the GOT so that all future calls also
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end in this function. */
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if ( profile)
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{
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got[2] = (ElfW(Addr)) &_dl_runtime_profile;
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if (GLRO(dl_profile) != NULL
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&& _dl_name_match_p (GLRO(dl_profile), l))
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/* Say that we really want profiling and the timers are
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started. */
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GL(dl_profile_map) = l;
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}
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else
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{
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/* This function will get called to fix up the GOT entry
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indicated by the offset on the stack, and then jump to
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the resolved address. */
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got[2] = (ElfW(Addr)) &_dl_runtime_resolve;
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}
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}
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return lazy;
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}
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/* Initial entry point for the dynamic linker. The C function
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_dl_start is the real entry point, its return value is the user
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program's entry point */
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#ifdef __LP64__
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# define RTLD_START RTLD_START_1 ("x", "3", "sp")
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#else
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# define RTLD_START RTLD_START_1 ("w", "2", "wsp")
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#endif
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#define RTLD_START_1(PTR, PTR_SIZE_LOG, PTR_SP) asm ("\
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.text \n\
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.globl _start \n\
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.type _start, %function \n\
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.globl _dl_start_user \n\
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.type _dl_start_user, %function \n\
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_start: \n\
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mov " PTR "0, " PTR_SP " \n\
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bl _dl_start \n\
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// returns user entry point in x0 \n\
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mov x21, x0 \n\
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_dl_start_user: \n\
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// get the original arg count \n\
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ldr " PTR "1, [sp] \n\
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// get the argv address \n\
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add " PTR "2, " PTR_SP ", #(1<<" PTR_SIZE_LOG ") \n\
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// get _dl_skip_args to see if we were \n\
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// invoked as an executable \n\
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adrp x4, _dl_skip_args \n\
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ldr w4, [x4, #:lo12:_dl_skip_args] \n\
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// do we need to adjust argc/argv \n\
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cmp w4, 0 \n\
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beq .L_done_stack_adjust \n\
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// subtract _dl_skip_args from original arg count \n\
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sub " PTR "1, " PTR "1, " PTR "4 \n\
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// store adjusted argc back to stack \n\
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str " PTR "1, [sp] \n\
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// find the first unskipped argument \n\
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mov " PTR "3, " PTR "2 \n\
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add " PTR "4, " PTR "2, " PTR "4, lsl #" PTR_SIZE_LOG " \n\
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// shuffle argv down \n\
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1: ldr " PTR "5, [x4], #(1<<" PTR_SIZE_LOG ") \n\
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str " PTR "5, [x3], #(1<<" PTR_SIZE_LOG ") \n\
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cmp " PTR "5, #0 \n\
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bne 1b \n\
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// shuffle envp down \n\
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1: ldr " PTR "5, [x4], #(1<<" PTR_SIZE_LOG ") \n\
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str " PTR "5, [x3], #(1<<" PTR_SIZE_LOG ") \n\
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cmp " PTR "5, #0 \n\
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bne 1b \n\
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// shuffle auxv down \n\
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1: ldp " PTR "0, " PTR "5, [x4, #(2<<" PTR_SIZE_LOG ")]! \n\
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stp " PTR "0, " PTR "5, [x3], #(2<<" PTR_SIZE_LOG ") \n\
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cmp " PTR "0, #0 \n\
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bne 1b \n\
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// Update _dl_argv \n\
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adrp x3, __GI__dl_argv \n\
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str " PTR "2, [x3, #:lo12:__GI__dl_argv] \n\
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.L_done_stack_adjust: \n\
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// compute envp \n\
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add " PTR "3, " PTR "2, " PTR "1, lsl #" PTR_SIZE_LOG " \n\
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add " PTR "3, " PTR "3, #(1<<" PTR_SIZE_LOG ") \n\
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adrp x16, _rtld_local \n\
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add " PTR "16, " PTR "16, #:lo12:_rtld_local \n\
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ldr " PTR "0, [x16] \n\
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bl _dl_init \n\
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// load the finalizer function \n\
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adrp x0, _dl_fini \n\
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add " PTR "0, " PTR "0, #:lo12:_dl_fini \n\
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// jump to the user_s entry point \n\
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br x21 \n\
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");
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#define elf_machine_type_class(type) \
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((((type) == AARCH64_R(JUMP_SLOT) \
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|| (type) == AARCH64_R(TLS_DTPMOD) \
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|| (type) == AARCH64_R(TLS_DTPREL) \
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|| (type) == AARCH64_R(TLS_TPREL) \
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|| (type) == AARCH64_R(TLSDESC)) * ELF_RTYPE_CLASS_PLT) \
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| (((type) == AARCH64_R(COPY)) * ELF_RTYPE_CLASS_COPY) \
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| (((type) == AARCH64_R(GLOB_DAT)) * ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA))
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#define ELF_MACHINE_JMP_SLOT AARCH64_R(JUMP_SLOT)
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/* AArch64 uses RELA not REL */
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#define ELF_MACHINE_NO_REL 1
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#define ELF_MACHINE_NO_RELA 0
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#define DL_PLATFORM_INIT dl_platform_init ()
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static inline void __attribute__ ((unused))
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dl_platform_init (void)
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{
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if (GLRO(dl_platform) != NULL && *GLRO(dl_platform) == '\0')
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/* Avoid an empty string which would disturb us. */
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GLRO(dl_platform) = NULL;
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#ifdef SHARED
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/* init_cpu_features has been called early from __libc_start_main in
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static executable. */
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init_cpu_features (&GLRO(dl_aarch64_cpu_features));
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#endif
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}
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static inline ElfW(Addr)
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elf_machine_fixup_plt (struct link_map *map, lookup_t t,
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const ElfW(Sym) *refsym, const ElfW(Sym) *sym,
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const ElfW(Rela) *reloc,
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ElfW(Addr) *reloc_addr,
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ElfW(Addr) value)
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{
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return *reloc_addr = value;
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}
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/* Return the final value of a plt relocation. */
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static inline ElfW(Addr)
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elf_machine_plt_value (struct link_map *map,
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const ElfW(Rela) *reloc,
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ElfW(Addr) value)
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{
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return value;
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}
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#endif
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6c4009 |
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6c4009 |
/* Names of the architecture-specific auditing callback functions. */
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6c4009 |
#define ARCH_LA_PLTENTER aarch64_gnu_pltenter
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#define ARCH_LA_PLTEXIT aarch64_gnu_pltexit
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6c4009 |
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6c4009 |
#ifdef RESOLVE_MAP
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6c4009 |
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auto inline void
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6c4009 |
__attribute__ ((always_inline))
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6c4009 |
elf_machine_rela (struct link_map *map, const ElfW(Rela) *reloc,
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6c4009 |
const ElfW(Sym) *sym, const struct r_found_version *version,
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6c4009 |
void *const reloc_addr_arg, int skip_ifunc)
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6c4009 |
{
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6c4009 |
ElfW(Addr) *const reloc_addr = reloc_addr_arg;
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6c4009 |
const unsigned int r_type = ELFW (R_TYPE) (reloc->r_info);
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6c4009 |
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6c4009 |
if (__builtin_expect (r_type == AARCH64_R(RELATIVE), 0))
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6c4009 |
*reloc_addr = map->l_addr + reloc->r_addend;
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6c4009 |
else if (__builtin_expect (r_type == R_AARCH64_NONE, 0))
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6c4009 |
return;
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6c4009 |
else
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6c4009 |
{
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6c4009 |
const ElfW(Sym) *const refsym = sym;
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6c4009 |
struct link_map *sym_map = RESOLVE_MAP (&sym, version, r_type);
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6c4009 |
ElfW(Addr) value = SYMBOL_ADDRESS (sym_map, sym, true);
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6c4009 |
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6c4009 |
if (sym != NULL
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6c4009 |
&& __glibc_unlikely (ELFW(ST_TYPE) (sym->st_info) == STT_GNU_IFUNC)
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6c4009 |
&& __glibc_likely (sym->st_shndx != SHN_UNDEF)
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6c4009 |
&& __glibc_likely (!skip_ifunc))
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6c4009 |
value = elf_ifunc_invoke (value);
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6c4009 |
|
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6c4009 |
switch (r_type)
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6c4009 |
{
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6c4009 |
case AARCH64_R(COPY):
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6c4009 |
if (sym == NULL)
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6c4009 |
break;
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6c4009 |
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|
Packit |
6c4009 |
if (sym->st_size > refsym->st_size
|
|
Packit |
6c4009 |
|| (GLRO(dl_verbose) && sym->st_size < refsym->st_size))
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
const char *strtab;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]);
|
|
Packit |
6c4009 |
_dl_error_printf ("\
|
|
Packit |
6c4009 |
%s: Symbol `%s' has different size in shared object, consider re-linking\n",
|
|
Packit |
6c4009 |
RTLD_PROGNAME, strtab + refsym->st_name);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
memcpy (reloc_addr_arg, (void *) value,
|
|
Packit |
6c4009 |
sym->st_size < refsym->st_size
|
|
Packit |
6c4009 |
? sym->st_size : refsym->st_size);
|
|
Packit |
6c4009 |
break;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
case AARCH64_R(RELATIVE):
|
|
Packit |
6c4009 |
case AARCH64_R(GLOB_DAT):
|
|
Packit |
6c4009 |
case AARCH64_R(JUMP_SLOT):
|
|
Packit |
6c4009 |
case AARCH64_R(ABS32):
|
|
Packit |
6c4009 |
#ifdef __LP64__
|
|
Packit |
6c4009 |
case AARCH64_R(ABS64):
|
|
Packit |
6c4009 |
#endif
|
|
Packit |
6c4009 |
*reloc_addr = value + reloc->r_addend;
|
|
Packit |
6c4009 |
break;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
case AARCH64_R(TLSDESC):
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
struct tlsdesc volatile *td =
|
|
Packit |
6c4009 |
(struct tlsdesc volatile *)reloc_addr;
|
|
Packit |
6c4009 |
#ifndef RTLD_BOOTSTRAP
|
|
Packit |
6c4009 |
if (! sym)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
td->arg = (void*)reloc->r_addend;
|
|
Packit |
6c4009 |
td->entry = _dl_tlsdesc_undefweak;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
else
|
|
Packit |
6c4009 |
#endif
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
#ifndef RTLD_BOOTSTRAP
|
|
Packit |
6c4009 |
# ifndef SHARED
|
|
Packit |
6c4009 |
CHECK_STATIC_TLS (map, sym_map);
|
|
Packit |
6c4009 |
# else
|
|
Packit |
6c4009 |
if (!TRY_STATIC_TLS (map, sym_map))
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
td->arg = _dl_make_tlsdesc_dynamic
|
|
Packit |
6c4009 |
(sym_map, sym->st_value + reloc->r_addend);
|
|
Packit |
6c4009 |
td->entry = _dl_tlsdesc_dynamic;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
else
|
|
Packit |
6c4009 |
# endif
|
|
Packit |
6c4009 |
#endif
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
td->arg = (void*)(sym->st_value + sym_map->l_tls_offset
|
|
Packit |
6c4009 |
+ reloc->r_addend);
|
|
Packit |
6c4009 |
td->entry = _dl_tlsdesc_return;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
break;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
case AARCH64_R(TLS_DTPMOD):
|
|
Packit |
6c4009 |
#ifdef RTLD_BOOTSTRAP
|
|
Packit |
6c4009 |
*reloc_addr = 1;
|
|
Packit |
6c4009 |
#else
|
|
Packit |
6c4009 |
if (sym_map != NULL)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
*reloc_addr = sym_map->l_tls_modid;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
#endif
|
|
Packit |
6c4009 |
break;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
case AARCH64_R(TLS_DTPREL):
|
|
Packit |
6c4009 |
if (sym)
|
|
Packit |
6c4009 |
*reloc_addr = sym->st_value + reloc->r_addend;
|
|
Packit |
6c4009 |
break;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
case AARCH64_R(TLS_TPREL):
|
|
Packit |
6c4009 |
if (sym)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
CHECK_STATIC_TLS (map, sym_map);
|
|
Packit |
6c4009 |
*reloc_addr =
|
|
Packit |
6c4009 |
sym->st_value + reloc->r_addend + sym_map->l_tls_offset;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
break;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
case AARCH64_R(IRELATIVE):
|
|
Packit |
6c4009 |
value = map->l_addr + reloc->r_addend;
|
|
Packit |
6c4009 |
value = elf_ifunc_invoke (value);
|
|
Packit |
6c4009 |
*reloc_addr = value;
|
|
Packit |
6c4009 |
break;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
default:
|
|
Packit |
6c4009 |
_dl_reloc_bad_type (map, r_type, 0);
|
|
Packit |
6c4009 |
break;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
inline void
|
|
Packit |
6c4009 |
__attribute__ ((always_inline))
|
|
Packit |
6c4009 |
elf_machine_rela_relative (ElfW(Addr) l_addr,
|
|
Packit |
6c4009 |
const ElfW(Rela) *reloc,
|
|
Packit |
6c4009 |
void *const reloc_addr_arg)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
ElfW(Addr) *const reloc_addr = reloc_addr_arg;
|
|
Packit |
6c4009 |
*reloc_addr = l_addr + reloc->r_addend;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
inline void
|
|
Packit |
6c4009 |
__attribute__ ((always_inline))
|
|
Packit |
6c4009 |
elf_machine_lazy_rel (struct link_map *map,
|
|
Packit |
6c4009 |
ElfW(Addr) l_addr,
|
|
Packit |
6c4009 |
const ElfW(Rela) *reloc,
|
|
Packit |
6c4009 |
int skip_ifunc)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
ElfW(Addr) *const reloc_addr = (void *) (l_addr + reloc->r_offset);
|
|
Packit |
6c4009 |
const unsigned int r_type = ELFW (R_TYPE) (reloc->r_info);
|
|
Packit |
6c4009 |
/* Check for unexpected PLT reloc type. */
|
|
Packit |
6c4009 |
if (__builtin_expect (r_type == AARCH64_R(JUMP_SLOT), 1))
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
if (__builtin_expect (map->l_mach.plt, 0) == 0)
|
|
Packit |
6c4009 |
*reloc_addr += l_addr;
|
|
Packit |
6c4009 |
else
|
|
Packit |
6c4009 |
*reloc_addr = map->l_mach.plt;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
else if (__builtin_expect (r_type == AARCH64_R(TLSDESC), 1))
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
const Elf_Symndx symndx = ELFW (R_SYM) (reloc->r_info);
|
|
Packit |
6c4009 |
const ElfW (Sym) *symtab = (const void *)D_PTR (map, l_info[DT_SYMTAB]);
|
|
Packit |
6c4009 |
const ElfW (Sym) *sym = &symtab[symndx];
|
|
Packit |
6c4009 |
const struct r_found_version *version = NULL;
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
if (map->l_info[VERSYMIDX (DT_VERSYM)] != NULL)
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
const ElfW (Half) *vernum =
|
|
Packit |
6c4009 |
(const void *)D_PTR (map, l_info[VERSYMIDX (DT_VERSYM)]);
|
|
Packit |
6c4009 |
version = &map->l_versions[vernum[symndx] & 0x7fff];
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
/* Always initialize TLS descriptors completely, because lazy
|
|
Packit |
6c4009 |
initialization requires synchronization at every TLS access. */
|
|
Packit |
6c4009 |
elf_machine_rela (map, reloc, sym, version, reloc_addr, skip_ifunc);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
else if (__glibc_unlikely (r_type == AARCH64_R(IRELATIVE)))
|
|
Packit |
6c4009 |
{
|
|
Packit |
6c4009 |
ElfW(Addr) value = map->l_addr + reloc->r_addend;
|
|
Packit |
6c4009 |
if (__glibc_likely (!skip_ifunc))
|
|
Packit |
6c4009 |
value = elf_ifunc_invoke (value);
|
|
Packit |
6c4009 |
*reloc_addr = value;
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
else
|
|
Packit |
6c4009 |
_dl_reloc_bad_type (map, r_type, 1);
|
|
Packit |
6c4009 |
}
|
|
Packit |
6c4009 |
|
|
Packit |
6c4009 |
#endif
|