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This patch defines ELF_MACHINE_NO_RELA on all architectures. Tested only on x86_64 to verify that the sources before and after are identical except for two instructions that pass the current line number in dl-machine.h to assert_fail.
538 lines
17 KiB
C
538 lines
17 KiB
C
/* Machine-dependent ELF dynamic relocation inline functions. x86-64 version.
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Copyright (C) 2001-2014 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Andreas Jaeger <aj@suse.de>.
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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
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License as published by the Free Software Foundation; either
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version 2.1 of the 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 "x86_64"
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#include <sys/param.h>
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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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/* 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_X86_64;
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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. This must be inlined in a function which
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uses global data. */
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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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/* This produces an IP-relative reloc which is resolved at link time. */
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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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/* Compute the difference between the runtime address of _DYNAMIC as seen
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by an IP-relative reference, and the link-time address found in the
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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, always_inline))
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elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
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{
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Elf64_Addr *got;
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extern void _dl_runtime_resolve (ElfW(Word)) attribute_hidden;
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extern void _dl_runtime_profile (ElfW(Word)) attribute_hidden;
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if (l->l_info[DT_JMPREL] && lazy)
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{
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/* The GOT entries for functions in the PLT have not yet been filled
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in. Their initial contents will arrange when called to push an
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offset into the .rel.plt section, push _GLOBAL_OFFSET_TABLE_[1],
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and then jump to _GLOBAL_OFFSET_TABLE_[2]. */
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got = (Elf64_Addr *) D_PTR (l, l_info[DT_PLTGOT]);
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/* If a library is prelinked but we have to relocate anyway,
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we have to be able to undo the prelinking of .got.plt.
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The prelinker saved us here address of .plt + 0x16. */
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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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l->l_mach.gotplt = (ElfW(Addr)) &got[3];
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}
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/* Identify this shared object. */
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*(ElfW(Addr) *) (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 (__glibc_unlikely (profile))
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{
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*(ElfW(Addr) *) (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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/* This is the object we are looking for. Say that we really
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want profiling and the timers are started. */
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GL(dl_profile_map) = l;
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}
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else
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/* This function will get called to fix up the GOT entry indicated by
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the offset on the stack, and then jump to the resolved address. */
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*(ElfW(Addr) *) (got + 2) = (ElfW(Addr)) &_dl_runtime_resolve;
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}
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if (l->l_info[ADDRIDX (DT_TLSDESC_GOT)] && lazy)
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*(ElfW(Addr)*)(D_PTR (l, l_info[ADDRIDX (DT_TLSDESC_GOT)]) + l->l_addr)
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= (ElfW(Addr)) &_dl_tlsdesc_resolve_rela;
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return lazy;
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}
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/* Initial entry point code for the dynamic linker.
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The C function `_dl_start' is the real entry point;
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its return value is the user program's entry point. */
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#define RTLD_START asm ("\n\
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.text\n\
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.align 16\n\
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.globl _start\n\
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.globl _dl_start_user\n\
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_start:\n\
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movq %rsp, %rdi\n\
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call _dl_start\n\
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_dl_start_user:\n\
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# Save the user entry point address in %r12.\n\
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movq %rax, %r12\n\
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# See if we were run as a command with the executable file\n\
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# name as an extra leading argument.\n\
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movl _dl_skip_args(%rip), %eax\n\
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# Pop the original argument count.\n\
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popq %rdx\n\
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# Adjust the stack pointer to skip _dl_skip_args words.\n\
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leaq (%rsp,%rax,8), %rsp\n\
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# Subtract _dl_skip_args from argc.\n\
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subl %eax, %edx\n\
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# Push argc back on the stack.\n\
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pushq %rdx\n\
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# Call _dl_init (struct link_map *main_map, int argc, char **argv, char **env)\n\
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# argc -> rsi\n\
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movq %rdx, %rsi\n\
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# Save %rsp value in %r13.\n\
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movq %rsp, %r13\n\
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# And align stack for the _dl_init_internal call. \n\
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andq $-16, %rsp\n\
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# _dl_loaded -> rdi\n\
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movq _rtld_local(%rip), %rdi\n\
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# env -> rcx\n\
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leaq 16(%r13,%rdx,8), %rcx\n\
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# argv -> rdx\n\
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leaq 8(%r13), %rdx\n\
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# Clear %rbp to mark outermost frame obviously even for constructors.\n\
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xorl %ebp, %ebp\n\
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# Call the function to run the initializers.\n\
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call _dl_init_internal@PLT\n\
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# Pass our finalizer function to the user in %rdx, as per ELF ABI.\n\
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leaq _dl_fini(%rip), %rdx\n\
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# And make sure %rsp points to argc stored on the stack.\n\
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movq %r13, %rsp\n\
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# Jump to the user's entry point.\n\
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jmp *%r12\n\
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.previous\n\
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");
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/* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry or
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TLS variable, so undefined references should not be allowed to
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define the value.
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ELF_RTYPE_CLASS_NOCOPY iff TYPE should not be allowed to resolve to one
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of the main executable's symbols, as for a COPY reloc. */
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#define elf_machine_type_class(type) \
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((((type) == R_X86_64_JUMP_SLOT \
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|| (type) == R_X86_64_DTPMOD64 \
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|| (type) == R_X86_64_DTPOFF64 \
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|| (type) == R_X86_64_TPOFF64 \
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|| (type) == R_X86_64_TLSDESC) \
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* ELF_RTYPE_CLASS_PLT) \
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| (((type) == R_X86_64_COPY) * ELF_RTYPE_CLASS_COPY))
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/* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */
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#define ELF_MACHINE_JMP_SLOT R_X86_64_JUMP_SLOT
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/* The relative ifunc relocation. */
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// XXX This is a work-around for a broken linker. Remove!
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#define ELF_MACHINE_IRELATIVE R_X86_64_IRELATIVE
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/* The x86-64 never uses Elf64_Rel/Elf32_Rel relocations. */
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#define ELF_MACHINE_NO_REL 1
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#define ELF_MACHINE_NO_RELA 0
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/* We define an initialization function. This is called very early in
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_dl_sysdep_start. */
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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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}
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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(Rela) *reloc,
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ElfW(Addr) *reloc_addr, 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. On x86-64 the
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JUMP_SLOT relocation ignores the addend. */
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static inline ElfW(Addr)
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elf_machine_plt_value (struct link_map *map, 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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/* Names of the architecture-specific auditing callback functions. */
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#define ARCH_LA_PLTENTER x86_64_gnu_pltenter
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#define ARCH_LA_PLTEXIT x86_64_gnu_pltexit
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#endif /* !dl_machine_h */
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#ifdef RESOLVE_MAP
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/* Perform the relocation specified by RELOC and SYM (which is fully resolved).
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MAP is the object containing the reloc. */
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auto inline void
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__attribute__ ((always_inline))
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elf_machine_rela (struct link_map *map, const ElfW(Rela) *reloc,
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const ElfW(Sym) *sym, const struct r_found_version *version,
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void *const reloc_addr_arg, int skip_ifunc)
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{
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ElfW(Addr) *const reloc_addr = reloc_addr_arg;
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const unsigned long int r_type = ELFW(R_TYPE) (reloc->r_info);
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# if !defined RTLD_BOOTSTRAP || !defined HAVE_Z_COMBRELOC
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if (__glibc_unlikely (r_type == R_X86_64_RELATIVE))
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{
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# if !defined RTLD_BOOTSTRAP && !defined HAVE_Z_COMBRELOC
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/* This is defined in rtld.c, but nowhere in the static libc.a;
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make the reference weak so static programs can still link.
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This declaration cannot be done when compiling rtld.c
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(i.e. #ifdef RTLD_BOOTSTRAP) because rtld.c contains the
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common defn for _dl_rtld_map, which is incompatible with a
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weak decl in the same file. */
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# ifndef SHARED
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weak_extern (GL(dl_rtld_map));
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# endif
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if (map != &GL(dl_rtld_map)) /* Already done in rtld itself. */
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# endif
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*reloc_addr = map->l_addr + reloc->r_addend;
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}
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else
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# endif
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# if !defined RTLD_BOOTSTRAP
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/* l_addr + r_addend may be > 0xffffffff and R_X86_64_RELATIVE64
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relocation updates the whole 64-bit entry. */
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if (__glibc_unlikely (r_type == R_X86_64_RELATIVE64))
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*(Elf64_Addr *) reloc_addr = (Elf64_Addr) map->l_addr + reloc->r_addend;
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else
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# endif
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if (__glibc_unlikely (r_type == R_X86_64_NONE))
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return;
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else
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{
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# ifndef RTLD_BOOTSTRAP
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const ElfW(Sym) *const refsym = sym;
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# endif
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struct link_map *sym_map = RESOLVE_MAP (&sym, version, r_type);
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ElfW(Addr) value = (sym == NULL ? 0
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: (ElfW(Addr)) sym_map->l_addr + sym->st_value);
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if (sym != NULL
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&& __builtin_expect (ELFW(ST_TYPE) (sym->st_info) == STT_GNU_IFUNC,
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0)
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&& __builtin_expect (sym->st_shndx != SHN_UNDEF, 1)
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&& __builtin_expect (!skip_ifunc, 1))
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value = ((ElfW(Addr) (*) (void)) value) ();
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switch (r_type)
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{
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# ifndef RTLD_BOOTSTRAP
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# ifdef __ILP32__
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case R_X86_64_SIZE64:
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/* Set to symbol size plus addend. */
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*(Elf64_Addr *) (uintptr_t) reloc_addr
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= (Elf64_Addr) sym->st_size + reloc->r_addend;
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break;
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case R_X86_64_SIZE32:
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# else
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case R_X86_64_SIZE64:
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# endif
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/* Set to symbol size plus addend. */
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value = sym->st_size;
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# endif
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case R_X86_64_GLOB_DAT:
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case R_X86_64_JUMP_SLOT:
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*reloc_addr = value + reloc->r_addend;
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break;
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# ifndef RESOLVE_CONFLICT_FIND_MAP
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case R_X86_64_DTPMOD64:
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# ifdef RTLD_BOOTSTRAP
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/* During startup the dynamic linker is always the module
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with index 1.
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XXX If this relocation is necessary move before RESOLVE
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call. */
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*reloc_addr = 1;
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# else
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/* Get the information from the link map returned by the
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resolve function. */
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if (sym_map != NULL)
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*reloc_addr = sym_map->l_tls_modid;
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# endif
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break;
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case R_X86_64_DTPOFF64:
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# ifndef RTLD_BOOTSTRAP
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/* During relocation all TLS symbols are defined and used.
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Therefore the offset is already correct. */
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if (sym != NULL)
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{
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value = sym->st_value + reloc->r_addend;
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# ifdef __ILP32__
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/* This relocation type computes a signed offset that is
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usually negative. The symbol and addend values are 32
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bits but the GOT entry is 64 bits wide and the whole
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64-bit entry is used as a signed quantity, so we need
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to sign-extend the computed value to 64 bits. */
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*(Elf64_Sxword *) reloc_addr = (Elf64_Sxword) (Elf32_Sword) value;
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# else
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*reloc_addr = value;
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# endif
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}
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# endif
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break;
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case R_X86_64_TLSDESC:
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{
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struct tlsdesc volatile *td =
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(struct tlsdesc volatile *)reloc_addr;
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# ifndef RTLD_BOOTSTRAP
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if (! sym)
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{
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td->arg = (void*)reloc->r_addend;
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td->entry = _dl_tlsdesc_undefweak;
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}
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else
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# endif
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{
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# ifndef RTLD_BOOTSTRAP
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# ifndef SHARED
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CHECK_STATIC_TLS (map, sym_map);
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# else
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if (!TRY_STATIC_TLS (map, sym_map))
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{
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td->arg = _dl_make_tlsdesc_dynamic
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(sym_map, sym->st_value + reloc->r_addend);
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td->entry = _dl_tlsdesc_dynamic;
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}
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else
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# endif
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# endif
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{
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td->arg = (void*)(sym->st_value - sym_map->l_tls_offset
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+ reloc->r_addend);
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td->entry = _dl_tlsdesc_return;
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}
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}
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break;
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}
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case R_X86_64_TPOFF64:
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/* The offset is negative, forward from the thread pointer. */
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# ifndef RTLD_BOOTSTRAP
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if (sym != NULL)
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# endif
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{
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# ifndef RTLD_BOOTSTRAP
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CHECK_STATIC_TLS (map, sym_map);
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# endif
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/* We know the offset of the object the symbol is contained in.
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It is a negative value which will be added to the
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thread pointer. */
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value = (sym->st_value + reloc->r_addend
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- sym_map->l_tls_offset);
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# ifdef __ILP32__
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/* The symbol and addend values are 32 bits but the GOT
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entry is 64 bits wide and the whole 64-bit entry is used
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as a signed quantity, so we need to sign-extend the
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computed value to 64 bits. */
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*(Elf64_Sxword *) reloc_addr = (Elf64_Sxword) (Elf32_Sword) value;
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# else
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*reloc_addr = value;
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# endif
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}
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break;
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# endif
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# ifndef RTLD_BOOTSTRAP
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case R_X86_64_64:
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/* value + r_addend may be > 0xffffffff and R_X86_64_64
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relocation updates the whole 64-bit entry. */
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*(Elf64_Addr *) reloc_addr = (Elf64_Addr) value + reloc->r_addend;
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break;
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# ifndef __ILP32__
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case R_X86_64_SIZE32:
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/* Set to symbol size plus addend. */
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value = sym->st_size;
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# endif
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case R_X86_64_32:
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value += reloc->r_addend;
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*(unsigned int *) reloc_addr = value;
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const char *fmt;
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if (__glibc_unlikely (value > UINT_MAX))
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{
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const char *strtab;
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fmt = "\
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%s: Symbol `%s' causes overflow in R_X86_64_32 relocation\n";
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# ifndef RESOLVE_CONFLICT_FIND_MAP
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print_err:
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# endif
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strtab = (const char *) D_PTR (map, l_info[DT_STRTAB]);
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_dl_error_printf (fmt, RTLD_PROGNAME, strtab + refsym->st_name);
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}
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break;
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# ifndef RESOLVE_CONFLICT_FIND_MAP
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/* Not needed for dl-conflict.c. */
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case R_X86_64_PC32:
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value += reloc->r_addend - (ElfW(Addr)) reloc_addr;
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*(unsigned int *) reloc_addr = value;
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if (__glibc_unlikely (value != (int) value))
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{
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fmt = "\
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%s: Symbol `%s' causes overflow in R_X86_64_PC32 relocation\n";
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goto print_err;
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}
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break;
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case R_X86_64_COPY:
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if (sym == NULL)
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/* This can happen in trace mode if an object could not be
|
|
found. */
|
|
break;
|
|
memcpy (reloc_addr_arg, (void *) value,
|
|
MIN (sym->st_size, refsym->st_size));
|
|
if (__builtin_expect (sym->st_size > refsym->st_size, 0)
|
|
|| (__builtin_expect (sym->st_size < refsym->st_size, 0)
|
|
&& GLRO(dl_verbose)))
|
|
{
|
|
fmt = "\
|
|
%s: Symbol `%s' has different size in shared object, consider re-linking\n";
|
|
goto print_err;
|
|
}
|
|
break;
|
|
# endif
|
|
case R_X86_64_IRELATIVE:
|
|
value = map->l_addr + reloc->r_addend;
|
|
value = ((ElfW(Addr) (*) (void)) value) ();
|
|
*reloc_addr = value;
|
|
break;
|
|
default:
|
|
_dl_reloc_bad_type (map, r_type, 0);
|
|
break;
|
|
# endif
|
|
}
|
|
}
|
|
}
|
|
|
|
auto 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;
|
|
#if !defined RTLD_BOOTSTRAP
|
|
/* l_addr + r_addend may be > 0xffffffff and R_X86_64_RELATIVE64
|
|
relocation updates the whole 64-bit entry. */
|
|
if (__glibc_unlikely (ELFW(R_TYPE) (reloc->r_info) == R_X86_64_RELATIVE64))
|
|
*(Elf64_Addr *) reloc_addr = (Elf64_Addr) l_addr + reloc->r_addend;
|
|
else
|
|
#endif
|
|
{
|
|
assert (ELFW(R_TYPE) (reloc->r_info) == R_X86_64_RELATIVE);
|
|
*reloc_addr = l_addr + reloc->r_addend;
|
|
}
|
|
}
|
|
|
|
auto 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 long int r_type = ELFW(R_TYPE) (reloc->r_info);
|
|
|
|
/* Check for unexpected PLT reloc type. */
|
|
if (__glibc_likely (r_type == R_X86_64_JUMP_SLOT))
|
|
{
|
|
if (__builtin_expect (map->l_mach.plt, 0) == 0)
|
|
*reloc_addr += l_addr;
|
|
else
|
|
*reloc_addr =
|
|
map->l_mach.plt
|
|
+ (((ElfW(Addr)) reloc_addr) - map->l_mach.gotplt) * 2;
|
|
}
|
|
else if (__glibc_likely (r_type == R_X86_64_TLSDESC))
|
|
{
|
|
struct tlsdesc volatile * __attribute__((__unused__)) 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 == R_X86_64_IRELATIVE))
|
|
{
|
|
ElfW(Addr) value = map->l_addr + reloc->r_addend;
|
|
if (__glibc_likely (!skip_ifunc))
|
|
value = ((ElfW(Addr) (*) (void)) value) ();
|
|
*reloc_addr = value;
|
|
}
|
|
else
|
|
_dl_reloc_bad_type (map, r_type, 1);
|
|
}
|
|
|
|
#endif /* RESOLVE_MAP */
|