diff options
Diffstat (limited to 'sysdeps/aarch64/dl-machine.h')
| -rw-r--r-- | sysdeps/aarch64/dl-machine.h | 42 |
1 files changed, 38 insertions, 4 deletions
diff --git a/sysdeps/aarch64/dl-machine.h b/sysdeps/aarch64/dl-machine.h index 823eefba46..4f27637b20 100644 --- a/sysdeps/aarch64/dl-machine.h +++ b/sysdeps/aarch64/dl-machine.h @@ -27,6 +27,9 @@ #include <dl-irel.h> #include <cpu-features.c> +/* Translate a processor specific dynamic tag to the index in l_info array. */ +#define DT_AARCH64(x) (DT_AARCH64_##x - DT_LOPROC + DT_NUM) + /* Return nonzero iff ELF header is compatible with the running host. */ static inline int __attribute__ ((unused)) elf_machine_matches_host (const ElfW(Ehdr) *ehdr) @@ -102,6 +105,10 @@ elf_machine_runtime_setup (struct link_map *l, int lazy, int profile) } } + /* Check if STO_AARCH64_VARIANT_PCS needs to be handled. */ + if (l->l_info[DT_AARCH64 (VARIANT_PCS)]) + l->l_mach.variant_pcs = 1; + return lazy; } @@ -388,10 +395,37 @@ elf_machine_lazy_rel (struct link_map *map, /* 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; + if (map->l_mach.plt == 0) + { + /* Prelinking. */ + *reloc_addr += l_addr; + return; + } + + if (__glibc_unlikely (map->l_mach.variant_pcs)) + { + /* Check the symbol table for variant PCS symbols. */ + const Elf_Symndx symndx = ELFW (R_SYM) (reloc->r_info); + const ElfW (Sym) *symtab = + (const void *)D_PTR (map, l_info[DT_SYMTAB]); + const ElfW (Sym) *sym = &symtab[symndx]; + if (__glibc_unlikely (sym->st_other & STO_AARCH64_VARIANT_PCS)) + { + /* Avoid lazy resolution of variant PCS symbols. */ + const struct r_found_version *version = NULL; + if (map->l_info[VERSYMIDX (DT_VERSYM)] != NULL) + { + const ElfW (Half) *vernum = + (const void *)D_PTR (map, l_info[VERSYMIDX (DT_VERSYM)]); + version = &map->l_versions[vernum[symndx] & 0x7fff]; + } + elf_machine_rela (map, reloc, sym, version, reloc_addr, + skip_ifunc); + return; + } + } + + *reloc_addr = map->l_mach.plt; } else if (__builtin_expect (r_type == AARCH64_R(TLSDESC), 1)) { |