diff options
| -rw-r--r-- | ChangeLog | 17 | ||||
| -rw-r--r-- | elf/elf.h | 11 | ||||
| -rw-r--r-- | sysdeps/powerpc/powerpc64/dl-machine.h | 44 | ||||
| -rw-r--r-- | sysdeps/powerpc/powerpc64/dl-trampoline.S | 8 |
4 files changed, 78 insertions, 2 deletions
@@ -1,6 +1,23 @@ 2013-12-04 Ulrich Weigand <Ulrich.Weigand@de.ibm.com> Alan Modra <amodra@gmail.com> + * elf/elf.h (DT_PPC64_OPT, PPC64_OPT_TLS, PPC64_OPT_MULTI_TOC): + Define. + (STO_PPC64_LOCAL_BIT, STO_PPC64_LOCAL_MASK, + PPC64_LOCAL_ENTRY_OFFSET): Define. + * sysdeps/powerpc/powerpc64/dl-machine.h (ppc64_local_entry_offset): + New function. + (elf_machine_fixup_plt): Call it. + (elf_machine_plt_conflict): Likewise. Add map, sym_map, and + reloc arguments. + (elf_machine_rela): Update call to elf_machine_plt_conflict. + * sysdeps/powerpc/powerpc64/dl-trampoline.S (_dl_runtime_resolve, + _dl_profile_resolve) [_CALL_ELF == 2]: Restore caller's TOC into + r2 before calling target. + +2013-12-04 Ulrich Weigand <Ulrich.Weigand@de.ibm.com> + Alan Modra <amodra@gmail.com> + * sysdeps/powerpc/powerpc64/sysdep.h [_CALL_ELF == 2] (PPC64_LOAD_FUNCPTR, DOT_LABEL, BODY_LABEL, ENTRY_2, END_2): New versions of macros to support ELFv2 ABI. @@ -2282,8 +2282,19 @@ typedef Elf32_Addr Elf32_Conflict; #define DT_PPC64_GLINK (DT_LOPROC + 0) #define DT_PPC64_OPD (DT_LOPROC + 1) #define DT_PPC64_OPDSZ (DT_LOPROC + 2) +#define DT_PPC64_OPT (DT_LOPROC + 3) #define DT_PPC64_NUM 3 +/* PowerPC64 specific values for the DT_PPC64_OPT Dyn entry. */ +#define PPC64_OPT_TLS 1 +#define PPC64_OPT_MULTI_TOC 2 + +/* PowerPC64 specific values for the Elf64_Sym st_other field. */ +#define STO_PPC64_LOCAL_BIT 5 +#define STO_PPC64_LOCAL_MASK (7 << STO_PPC64_LOCAL_BIT) +#define PPC64_LOCAL_ENTRY_OFFSET(other) \ + (((1 << (((other) & STO_PPC64_LOCAL_MASK) >> STO_PPC64_LOCAL_BIT)) >> 2) << 2) + /* ARM specific declarations */ diff --git a/sysdeps/powerpc/powerpc64/dl-machine.h b/sysdeps/powerpc/powerpc64/dl-machine.h index f222bb0..eccfbb3 100644 --- a/sysdeps/powerpc/powerpc64/dl-machine.h +++ b/sysdeps/powerpc/powerpc64/dl-machine.h @@ -424,6 +424,42 @@ elf_machine_runtime_setup (struct link_map *map, int lazy, int profile) return lazy; } +#if _CALL_ELF == 2 +/* If the PLT entry whose reloc is 'reloc' resolves to a function in + the same object, return the target function's local entry point + offset if usable. */ +static inline Elf64_Addr __attribute__ ((always_inline)) +ppc64_local_entry_offset (struct link_map *map, lookup_t sym_map, + const Elf64_Rela *reloc) +{ + const Elf64_Sym *symtab; + const Elf64_Sym *sym; + + /* If the target function is in a different object, we cannot + use the local entry point. */ + if (sym_map != map) + return 0; + + /* If the linker inserted multiple TOCs, we cannot use the + local entry point. */ + if (map->l_info[DT_PPC64(OPT)] + && (map->l_info[DT_PPC64(OPT)]->d_un.d_val & PPC64_OPT_MULTI_TOC)) + return 0; + + /* Otherwise, we can use the local entry point. Retrieve its offset + from the symbol's ELF st_other field. */ + symtab = (const void *) D_PTR (map, l_info[DT_SYMTAB]); + sym = &symtab[ELFW(R_SYM) (reloc->r_info)]; + + /* If the target function is an ifunc then the local entry offset is + for the resolver, not the final destination. */ + if (__builtin_expect (ELFW(ST_TYPE) (sym->st_info) == STT_GNU_IFUNC, 0)) + return 0; + + return PPC64_LOCAL_ENTRY_OFFSET (sym->st_other); +} +#endif + /* Change the PLT entry whose reloc is 'reloc' to call the actual routine. */ static inline Elf64_Addr __attribute__ ((always_inline)) @@ -470,6 +506,7 @@ elf_machine_fixup_plt (struct link_map *map, lookup_t sym_map, PPC_DCBST (&plt->fd_func); PPC_ISYNC; #else + finaladdr += ppc64_local_entry_offset (map, sym_map, reloc); *reloc_addr = finaladdr; #endif @@ -477,7 +514,9 @@ elf_machine_fixup_plt (struct link_map *map, lookup_t sym_map, } static inline void __attribute__ ((always_inline)) -elf_machine_plt_conflict (Elf64_Addr *reloc_addr, Elf64_Addr finaladdr) +elf_machine_plt_conflict (struct link_map *map, lookup_t sym_map, + const Elf64_Rela *reloc, + Elf64_Addr *reloc_addr, Elf64_Addr finaladdr) { #if _CALL_ELF != 2 Elf64_FuncDesc *plt = (Elf64_FuncDesc *) reloc_addr; @@ -491,6 +530,7 @@ elf_machine_plt_conflict (Elf64_Addr *reloc_addr, Elf64_Addr finaladdr) PPC_DCBST (&plt->fd_toc); PPC_SYNC; #else + finaladdr += ppc64_local_entry_offset (map, sym_map, reloc); *reloc_addr = finaladdr; #endif } @@ -646,7 +686,7 @@ elf_machine_rela (struct link_map *map, /* Fall thru */ case R_PPC64_JMP_SLOT: #ifdef RESOLVE_CONFLICT_FIND_MAP - elf_machine_plt_conflict (reloc_addr, value); + elf_machine_plt_conflict (map, sym_map, reloc, reloc_addr, value); #else elf_machine_fixup_plt (map, sym_map, reloc, reloc_addr, value); #endif diff --git a/sysdeps/powerpc/powerpc64/dl-trampoline.S b/sysdeps/powerpc/powerpc64/dl-trampoline.S index bffc4cb..e31311c 100644 --- a/sysdeps/powerpc/powerpc64/dl-trampoline.S +++ b/sysdeps/powerpc/powerpc64/dl-trampoline.S @@ -74,6 +74,10 @@ EALIGN(_dl_runtime_resolve, 4, 0) /* Prepare for calling the function returned by fixup. */ PPC64_LOAD_FUNCPTR r3 ld r3,INT_PARMS+0(r1) +#if _CALL_ELF == 2 +/* Restore the caller's TOC in case we jump to a local entry point. */ + ld r2,FRAME_SIZE+40(r1) +#endif /* Unwind the stack frame, and jump. */ addi r1,r1,FRAME_SIZE bctr @@ -321,6 +325,10 @@ L(restoreFXR): /* Prepare for calling the function returned by fixup. */ PPC64_LOAD_FUNCPTR r3 ld r3,INT_PARMS+0(r1) +#if _CALL_ELF == 2 +/* Restore the caller's TOC in case we jump to a local entry point. */ + ld r2,FRAME_SIZE+40(r1) +#endif /* Load the floating point registers. */ lfd fp1,FPR_PARMS+0(r1) lfd fp2,FPR_PARMS+8(r1) |