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Diffstat (limited to 'sysdeps/powerpc/powerpc32/dl-machine.h')
| -rw-r--r-- | sysdeps/powerpc/powerpc32/dl-machine.h | 455 |
1 files changed, 0 insertions, 455 deletions
diff --git a/sysdeps/powerpc/powerpc32/dl-machine.h b/sysdeps/powerpc/powerpc32/dl-machine.h deleted file mode 100644 index 28eb50f92d..0000000000 --- a/sysdeps/powerpc/powerpc32/dl-machine.h +++ /dev/null @@ -1,455 +0,0 @@ -/* Machine-dependent ELF dynamic relocation inline functions. PowerPC version. - Copyright (C) 1995-2017 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - 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_machine_h -#define dl_machine_h - -#define ELF_MACHINE_NAME "powerpc" - -#include <assert.h> -#include <dl-tls.h> -#include <dl-irel.h> -#include <hwcapinfo.h> - -/* Translate a processor specific dynamic tag to the index - in l_info array. */ -#define DT_PPC(x) (DT_PPC_##x - DT_LOPROC + DT_NUM) - -/* Return nonzero iff ELF header is compatible with the running host. */ -static inline int -elf_machine_matches_host (const Elf32_Ehdr *ehdr) -{ - return ehdr->e_machine == EM_PPC; -} - -/* Return the value of the GOT pointer. */ -static inline Elf32_Addr * __attribute__ ((const)) -ppc_got (void) -{ - Elf32_Addr *got; - - asm ("bcl 20,31,1f\n" - "1: mflr %0\n" - " addis %0,%0,_GLOBAL_OFFSET_TABLE_-1b@ha\n" - " addi %0,%0,_GLOBAL_OFFSET_TABLE_-1b@l\n" - : "=b" (got) : : "lr"); - - return got; -} - -/* Return the link-time address of _DYNAMIC, stored as - the first value in the GOT. */ -static inline Elf32_Addr __attribute__ ((const)) -elf_machine_dynamic (void) -{ - return *ppc_got (); -} - -/* Return the run-time load address of the shared object. */ -static inline Elf32_Addr __attribute__ ((const)) -elf_machine_load_address (void) -{ - Elf32_Addr *branchaddr; - Elf32_Addr runtime_dynamic; - - /* This is much harder than you'd expect. Possibly I'm missing something. - The 'obvious' way: - - Apparently, "bcl 20,31,$+4" is what should be used to load LR - with the address of the next instruction. - I think this is so that machines that do bl/blr pairing don't - get confused. - - asm ("bcl 20,31,0f ;" - "0: mflr 0 ;" - "lis %0,0b@ha;" - "addi %0,%0,0b@l;" - "subf %0,%0,0" - : "=b" (addr) : : "r0", "lr"); - - doesn't work, because the linker doesn't have to (and in fact doesn't) - update the @ha and @l references; the loader (which runs after this - code) will do that. - - Instead, we use the following trick: - - The linker puts the _link-time_ address of _DYNAMIC at the first - word in the GOT. We could branch to that address, if we wanted, - by using an @local reloc; the linker works this out, so it's safe - to use now. We can't, of course, actually branch there, because - we'd cause an illegal instruction exception; so we need to compute - the address ourselves. That gives us the following code: */ - - /* Get address of the 'b _DYNAMIC@local'... */ - asm ("bcl 20,31,0f;" - "b _DYNAMIC@local;" - "0:" - : "=l" (branchaddr)); - - /* So now work out the difference between where the branch actually points, - and the offset of that location in memory from the start of the file. */ - runtime_dynamic = ((Elf32_Addr) branchaddr - + ((Elf32_Sword) (*branchaddr << 6 & 0xffffff00) >> 6)); - - return runtime_dynamic - elf_machine_dynamic (); -} - -#define ELF_MACHINE_BEFORE_RTLD_RELOC(dynamic_info) /* nothing */ - -/* The PLT uses Elf32_Rela relocs. */ -#define elf_machine_relplt elf_machine_rela - -/* Mask identifying addresses reserved for the user program, - where the dynamic linker should not map anything. */ -#define ELF_MACHINE_USER_ADDRESS_MASK 0xf0000000UL - -/* The actual _start code is in dl-start.S. Use a really - ugly bit of assembler to let dl-start.o see _dl_start. */ -#define RTLD_START asm (".globl _dl_start"); - -/* Decide where a relocatable object should be loaded. */ -extern ElfW(Addr) -__elf_preferred_address(struct link_map *loader, size_t maplength, - ElfW(Addr) mapstartpref); -#define ELF_PREFERRED_ADDRESS(loader, maplength, mapstartpref) \ - __elf_preferred_address (loader, maplength, mapstartpref) - -/* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry, so - PLT entries should not be allowed to define the value. - ELF_RTYPE_CLASS_COPY iff TYPE should not be allowed to resolve to one - of the main executable's symbols, as for a COPY reloc. */ -/* We never want to use a PLT entry as the destination of a - reloc, when what is being relocated is a branch. This is - partly for efficiency, but mostly so we avoid loops. */ -#define elf_machine_type_class(type) \ - ((((type) == R_PPC_JMP_SLOT \ - || (type) == R_PPC_REL24 \ - || ((type) >= R_PPC_DTPMOD32 /* contiguous TLS */ \ - && (type) <= R_PPC_DTPREL32) \ - || (type) == R_PPC_ADDR24) * ELF_RTYPE_CLASS_PLT) \ - | (((type) == R_PPC_COPY) * ELF_RTYPE_CLASS_COPY)) - -/* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */ -#define ELF_MACHINE_JMP_SLOT R_PPC_JMP_SLOT - -/* The PowerPC never uses REL relocations. */ -#define ELF_MACHINE_NO_REL 1 -#define ELF_MACHINE_NO_RELA 0 - -/* We define an initialization function to initialize HWCAP/HWCAP2 and - platform data so it can be copied into the TCB later. This is called - very early in _dl_sysdep_start for dynamically linked binaries. */ -#ifdef SHARED -# define DL_PLATFORM_INIT dl_platform_init () - -static inline void __attribute__ ((unused)) -dl_platform_init (void) -{ - __tcb_parse_hwcap_and_convert_at_platform (); -} -#endif - -/* Set up the loaded object described by MAP so its unrelocated PLT - entries will jump to the on-demand fixup code in dl-runtime.c. - Also install a small trampoline to be used by entries that have - been relocated to an address too far away for a single branch. */ -extern int __elf_machine_runtime_setup (struct link_map *map, - int lazy, int profile); - -static inline int -elf_machine_runtime_setup (struct link_map *map, - int lazy, int profile) -{ - if (map->l_info[DT_JMPREL] == 0) - return lazy; - - if (map->l_info[DT_PPC(GOT)] == 0) - /* Handle old style PLT. */ - return __elf_machine_runtime_setup (map, lazy, profile); - - /* New style non-exec PLT consisting of an array of addresses. */ - map->l_info[DT_PPC(GOT)]->d_un.d_ptr += map->l_addr; - if (lazy) - { - Elf32_Addr *plt, *got, glink; - Elf32_Word num_plt_entries; - void (*dlrr) (void); - extern void _dl_runtime_resolve (void); - extern void _dl_prof_resolve (void); - - if (__glibc_likely (!profile)) - dlrr = _dl_runtime_resolve; - else - { - if (GLRO(dl_profile) != NULL - &&_dl_name_match_p (GLRO(dl_profile), map)) - GL(dl_profile_map) = map; - dlrr = _dl_prof_resolve; - } - got = (Elf32_Addr *) map->l_info[DT_PPC(GOT)]->d_un.d_ptr; - glink = got[1]; - got[1] = (Elf32_Addr) dlrr; - got[2] = (Elf32_Addr) map; - - /* Relocate everything in .plt by the load address offset. */ - plt = (Elf32_Addr *) D_PTR (map, l_info[DT_PLTGOT]); - num_plt_entries = (map->l_info[DT_PLTRELSZ]->d_un.d_val - / sizeof (Elf32_Rela)); - - /* If a library is prelinked but we have to relocate anyway, - we have to be able to undo the prelinking of .plt section. - The prelinker saved us at got[1] address of .glink - section's start. */ - if (glink) - { - glink += map->l_addr; - while (num_plt_entries-- != 0) - *plt++ = glink, glink += 4; - } - else - while (num_plt_entries-- != 0) - *plt++ += map->l_addr; - } - return lazy; -} - -/* Change the PLT entry whose reloc is 'reloc' to call the actual routine. */ -extern Elf32_Addr __elf_machine_fixup_plt (struct link_map *map, - Elf32_Addr *reloc_addr, - Elf32_Addr finaladdr); - -static inline Elf32_Addr -elf_machine_fixup_plt (struct link_map *map, lookup_t t, - const Elf32_Rela *reloc, - Elf32_Addr *reloc_addr, Elf64_Addr finaladdr) -{ - if (map->l_info[DT_PPC(GOT)] == 0) - /* Handle old style PLT. */ - return __elf_machine_fixup_plt (map, reloc_addr, finaladdr); - - *reloc_addr = finaladdr; - return finaladdr; -} - -/* Return the final value of a plt relocation. */ -static inline Elf32_Addr -elf_machine_plt_value (struct link_map *map, const Elf32_Rela *reloc, - Elf32_Addr value) -{ - return value + reloc->r_addend; -} - - -/* Names of the architecture-specific auditing callback functions. */ -#define ARCH_LA_PLTENTER ppc32_gnu_pltenter -#define ARCH_LA_PLTEXIT ppc32_gnu_pltexit - -#endif /* dl_machine_h */ - -#ifdef RESOLVE_MAP - -/* Do the actual processing of a reloc, once its target address - has been determined. */ -extern void __process_machine_rela (struct link_map *map, - const Elf32_Rela *reloc, - struct link_map *sym_map, - const Elf32_Sym *sym, - const Elf32_Sym *refsym, - Elf32_Addr *const reloc_addr, - Elf32_Addr finaladdr, - int rinfo) attribute_hidden; - -/* Call _dl_signal_error when a resolved value overflows a relocated area. */ -extern void _dl_reloc_overflow (struct link_map *map, - const char *name, - Elf32_Addr *const reloc_addr, - const Elf32_Sym *refsym) attribute_hidden; - -/* Perform the relocation specified by RELOC and SYM (which is fully resolved). - LOADADDR is the load address of the object; INFO is an array indexed - by DT_* of the .dynamic section info. */ - -auto inline void __attribute__ ((always_inline)) -elf_machine_rela (struct link_map *map, const Elf32_Rela *reloc, - const Elf32_Sym *sym, const struct r_found_version *version, - void *const reloc_addr_arg, int skip_ifunc) -{ - Elf32_Addr *const reloc_addr = reloc_addr_arg; - const Elf32_Sym *const refsym = sym; - Elf32_Addr value; - const int r_type = ELF32_R_TYPE (reloc->r_info); - struct link_map *sym_map = NULL; - -#ifndef RESOLVE_CONFLICT_FIND_MAP - if (r_type == R_PPC_RELATIVE) - { - *reloc_addr = map->l_addr + reloc->r_addend; - return; - } - - if (__glibc_unlikely (r_type == R_PPC_NONE)) - return; - - /* binutils on ppc32 includes st_value in r_addend for relocations - against local symbols. */ - if (__builtin_expect (ELF32_ST_BIND (sym->st_info) == STB_LOCAL, 0) - && sym->st_shndx != SHN_UNDEF) - value = map->l_addr; - else - { - sym_map = RESOLVE_MAP (&sym, version, r_type); - value = sym_map == NULL ? 0 : sym_map->l_addr + sym->st_value; - } - value += reloc->r_addend; -#else - value = reloc->r_addend; -#endif - - if (sym != NULL - && __builtin_expect (ELFW(ST_TYPE) (sym->st_info) == STT_GNU_IFUNC, 0) - && __builtin_expect (sym->st_shndx != SHN_UNDEF, 1) - && __builtin_expect (!skip_ifunc, 1)) - value = elf_ifunc_invoke (value); - - /* A small amount of code is duplicated here for speed. In libc, - more than 90% of the relocs are R_PPC_RELATIVE; in the X11 shared - libraries, 60% are R_PPC_RELATIVE, 24% are R_PPC_GLOB_DAT or - R_PPC_ADDR32, and 16% are R_PPC_JMP_SLOT (which this routine - wouldn't usually handle). As an bonus, doing this here allows - the switch statement in __process_machine_rela to work. */ - switch (r_type) - { - case R_PPC_GLOB_DAT: - case R_PPC_ADDR32: - *reloc_addr = value; - break; - -#ifndef RESOLVE_CONFLICT_FIND_MAP -# ifdef RTLD_BOOTSTRAP -# define NOT_BOOTSTRAP 0 -# else -# define NOT_BOOTSTRAP 1 -# endif - - case R_PPC_DTPMOD32: - if (map->l_info[DT_PPC(OPT)] - && (map->l_info[DT_PPC(OPT)]->d_un.d_val & PPC_OPT_TLS)) - { - if (!NOT_BOOTSTRAP) - { - reloc_addr[0] = 0; - reloc_addr[1] = (sym_map->l_tls_offset - TLS_TP_OFFSET - + TLS_DTV_OFFSET); - break; - } - else if (sym_map != NULL) - { -# ifndef SHARED - CHECK_STATIC_TLS (map, sym_map); -# else - if (TRY_STATIC_TLS (map, sym_map)) -# endif - { - reloc_addr[0] = 0; - /* Set up for local dynamic. */ - reloc_addr[1] = (sym_map->l_tls_offset - TLS_TP_OFFSET - + TLS_DTV_OFFSET); - break; - } - } - } - if (!NOT_BOOTSTRAP) - /* During startup the dynamic linker is always index 1. */ - *reloc_addr = 1; - else if (sym_map != NULL) - /* Get the information from the link map returned by the - RESOLVE_MAP function. */ - *reloc_addr = sym_map->l_tls_modid; - break; - case R_PPC_DTPREL32: - if (map->l_info[DT_PPC(OPT)] - && (map->l_info[DT_PPC(OPT)]->d_un.d_val & PPC_OPT_TLS)) - { - if (!NOT_BOOTSTRAP) - { - *reloc_addr = TLS_TPREL_VALUE (sym_map, sym, reloc); - break; - } - else if (sym_map != NULL) - { - /* This reloc is always preceded by R_PPC_DTPMOD32. */ -# ifndef SHARED - assert (HAVE_STATIC_TLS (map, sym_map)); -# else - if (HAVE_STATIC_TLS (map, sym_map)) -# endif - { - *reloc_addr = TLS_TPREL_VALUE (sym_map, sym, reloc); - break; - } - } - } - /* During relocation all TLS symbols are defined and used. - Therefore the offset is already correct. */ - if (NOT_BOOTSTRAP && sym_map != NULL) - *reloc_addr = TLS_DTPREL_VALUE (sym, reloc); - break; - case R_PPC_TPREL32: - if (!NOT_BOOTSTRAP || sym_map != NULL) - { - if (NOT_BOOTSTRAP) - CHECK_STATIC_TLS (map, sym_map); - *reloc_addr = TLS_TPREL_VALUE (sym_map, sym, reloc); - } - break; -#endif - - case R_PPC_JMP_SLOT: -#ifdef RESOLVE_CONFLICT_FIND_MAP - RESOLVE_CONFLICT_FIND_MAP (map, reloc_addr); -#endif - if (map->l_info[DT_PPC(GOT)] != 0) - { - *reloc_addr = value; - break; - } - /* FALLTHROUGH */ - - default: - __process_machine_rela (map, reloc, sym_map, sym, refsym, - reloc_addr, value, r_type); - } -} - -auto inline void __attribute__ ((always_inline)) -elf_machine_rela_relative (Elf32_Addr l_addr, const Elf32_Rela *reloc, - void *const reloc_addr_arg) -{ - Elf32_Addr *const reloc_addr = reloc_addr_arg; - *reloc_addr = l_addr + reloc->r_addend; -} - -auto inline void __attribute__ ((always_inline)) -elf_machine_lazy_rel (struct link_map *map, - Elf32_Addr l_addr, const Elf32_Rela *reloc, - int skip_ifunc) -{ - /* elf_machine_runtime_setup handles this. */ -} - -#endif /* RESOLVE_MAP */ |