diff options
Diffstat (limited to 'sysdeps/x86_64/dl-ifunc-reloc.h')
| -rw-r--r-- | sysdeps/x86_64/dl-ifunc-reloc.h | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/sysdeps/x86_64/dl-ifunc-reloc.h b/sysdeps/x86_64/dl-ifunc-reloc.h new file mode 100644 index 0000000..bf436bf --- /dev/null +++ b/sysdeps/x86_64/dl-ifunc-reloc.h @@ -0,0 +1,91 @@ +/* IFUNC relocation processing, x86-64 version. + Copyright (C) 2001-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Andreas Jaeger <aj@suse.de>. + + 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_IFUNC_RELOC_H +#define DL_IFUNC_RELOC_H + +static inline void +_dl_ifunc_process_relocation (const struct dl_ifunc_relocation *ifunc, + struct link_map *sym_map) +{ + const ElfW(Rela) *reloc = ifunc->reloc; + const unsigned long int r_type = ELFW(R_TYPE) (reloc->r_info); + ElfW(Addr) *const reloc_addr = ifunc->reloc_addr; + + /* Special case: A relative IFUNC relocation does not have an + associated symbol. */ + if (r_type == R_X86_64_IRELATIVE) + { + ElfW(Addr) value = sym_map->l_addr + reloc->r_addend; + value = ((ElfW(Addr) (*) (void)) value) (); + *reloc_addr = value; + return; + } + + ElfW(Addr) value = (ElfW(Addr)) sym_map->l_addr + ifunc->ifunc_sym->st_value; + value = ((ElfW(Addr) (*) (void)) value) (); + + /* This switch statement needs to be kept in sync with the switch + statement in elf_machine_rela. */ + switch (r_type) + { + case R_X86_64_GLOB_DAT: + case R_X86_64_JUMP_SLOT: + *reloc_addr = value + reloc->r_addend; + break; + + case R_X86_64_64: + /* value + r_addend may be > 0xffffffff and R_X86_64_64 + relocation updates the whole 64-bit entry. */ + *(Elf64_Addr *) reloc_addr = (Elf64_Addr) value + reloc->r_addend; + break; + case R_X86_64_32: + value += reloc->r_addend; + *(unsigned int *) reloc_addr = value; + + const char *fmt; + if (__glibc_unlikely (value > UINT_MAX)) + { + const char *strtab; + + fmt = "\ +%s: Symbol `%s' causes overflow in R_X86_64_32 relocation\n"; + print_err: + strtab = (const char *) D_PTR (sym_map, l_info[DT_STRTAB]); + + _dl_error_printf (fmt, RTLD_PROGNAME, + strtab + ifunc->ifunc_sym->st_name); + } + break; + case R_X86_64_PC32: + value += reloc->r_addend - (ElfW(Addr)) reloc_addr; + *(unsigned int *) reloc_addr = value; + if (__glibc_unlikely (value != (int) value)) + { + fmt = "\ +%s: Symbol `%s' causes overflow in R_X86_64_PC32 relocation\n"; + goto print_err; + } + break; + default: + _dl_reloc_bad_type (ifunc->reloc_map, r_type, 0); + } +} + +#endif /* DL_IFUNC_RELOC_H */ |