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- /*
- * Various assembly language/system dependent hacks that are required
- * so that we can minimize the amount of platform specific code.
- * Copyright (C) 2000-2004 by Erik Andersen <andersen@codepoet.org>
- * Copyright (C) 2017 by Waldemar Brodkorb <wbx@uclibc-ng.org>
- * Ported from GNU C Library
- * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
- */
- /* Copyright (C) 1995-2016 Free Software Foundation, Inc.
- 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/>. */
- /* Define this if the system uses RELOCA. */
- #define ELF_USES_RELOCA
- #include <elf.h>
- #include <link.h>
- /* Initialization sequence for the GOT. */
- #define INIT_GOT(GOT_BASE,MODULE) \
- { \
- GOT_BASE[2] = (unsigned long) _dl_linux_resolve; \
- GOT_BASE[1] = (unsigned long) MODULE; \
- }
- /* Here we define the magic numbers that this dynamic loader should accept */
- #define MAGIC1 EM_AARCH64
- #undef MAGIC2
- /* Used for error messages */
- #define ELF_TARGET "aarch64"
- struct elf_resolve;
- unsigned long _dl_linux_resolver(struct elf_resolve * tpnt, int reloc_entry);
- #define elf_machine_type_class(type) \
- ((((type) == R_AARCH64_JUMP_SLOT \
- || (type) == R_AARCH64_TLS_DTPMOD \
- || (type) == R_AARCH64_TLS_DTPREL \
- || (type) == R_AARCH64_TLS_TPREL \
- || (type) == R_AARCH64_TLSDESC) * ELF_RTYPE_CLASS_PLT) \
- | (((type) == R_AARCH64_COPY) * ELF_RTYPE_CLASS_COPY))
- /* Return the link-time address of _DYNAMIC. Conveniently, this is the
- first element of the GOT. */
- extern const ElfW(Addr) _GLOBAL_OFFSET_TABLE_[] attribute_hidden;
- static __always_inline ElfW(Addr) __attribute__ ((unused))
- elf_machine_dynamic (void)
- {
- return _GLOBAL_OFFSET_TABLE_[0];
- }
- /* Return the run-time load address of the shared object. */
- static __always_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"
- " add %1, %1, #:lo12:_dl_start \n"
- " ldr %w0, 1f \n"
- " b 2f \n"
- "1: \n"
- " .word _dl_start \n"
- "2: \n"
- : "=r" (static_addr), "=r" (dynamic_addr));
- return dynamic_addr - static_addr;
- }
- static __always_inline void
- elf_machine_relative(Elf64_Addr load_off, const Elf64_Addr rel_addr,
- Elf64_Word relative_count)
- {
- Elf64_Rela *rpnt = (Elf64_Rela*)rel_addr;
- --rpnt;
- do {
- Elf64_Addr *const reloc_addr = (Elf64_Addr*)(load_off + (++rpnt)->r_offset);
- *reloc_addr = load_off + rpnt->r_addend;
- } while (--relative_count);
- }
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