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Diffstat (limited to 'sysdeps/mips/dl-machine.h')
| -rw-r--r-- | sysdeps/mips/dl-machine.h | 611 |
1 files changed, 0 insertions, 611 deletions
diff --git a/sysdeps/mips/dl-machine.h b/sysdeps/mips/dl-machine.h deleted file mode 100644 index c04609f9bc..0000000000 --- a/sysdeps/mips/dl-machine.h +++ /dev/null @@ -1,611 +0,0 @@ -/* Machine-dependent ELF dynamic relocation inline functions. MIPS version. - Copyright (C) 1996-2001, 2002, 2003, 2004, 2005 - Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Kazumoto Kojima <kkojima@info.kanagawa-u.ac.jp>. - - 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, write to the Free - Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA - 02111-1307 USA. */ - -/* FIXME: Profiling of shared libraries is not implemented yet. */ -#ifndef dl_machine_h -#define dl_machine_h - -#define ELF_MACHINE_NAME "MIPS" - -#define ELF_MACHINE_NO_PLT - -#include <entry.h> - -#ifndef ENTRY_POINT -#error ENTRY_POINT needs to be defined for MIPS. -#endif - -#include <sgidefs.h> -#include <sys/asm.h> -#include <dl-tls.h> - -/* The offset of gp from GOT might be system-dependent. It's set by - ld. The same value is also */ -#define OFFSET_GP_GOT 0x7ff0 - -#ifndef _RTLD_PROLOGUE -# define _RTLD_PROLOGUE(entry) \ - ".globl\t" __STRING(entry) "\n\t" \ - ".ent\t" __STRING(entry) "\n\t" \ - ".type\t" __STRING(entry) ", @function\n" \ - __STRING(entry) ":\n\t" -#endif - -#ifndef _RTLD_EPILOGUE -# define _RTLD_EPILOGUE(entry) \ - ".end\t" __STRING(entry) "\n\t" \ - ".size\t" __STRING(entry) ", . - " __STRING(entry) "\n\t" -#endif - -/* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. - This makes no sense on MIPS but we have to define this to R_MIPS_REL32 - to avoid the asserts in dl-lookup.c from blowing. */ -#define ELF_MACHINE_JMP_SLOT R_MIPS_REL32 -#define elf_machine_type_class(type) ELF_RTYPE_CLASS_PLT - -/* Translate a processor specific dynamic tag to the index - in l_info array. */ -#define DT_MIPS(x) (DT_MIPS_##x - DT_LOPROC + DT_NUM) - -/* If there is a DT_MIPS_RLD_MAP entry in the dynamic section, fill it in - with the run-time address of the r_debug structure */ -#define ELF_MACHINE_DEBUG_SETUP(l,r) \ -do { if ((l)->l_info[DT_MIPS (RLD_MAP)]) \ - *(ElfW(Addr) *)((l)->l_info[DT_MIPS (RLD_MAP)]->d_un.d_ptr) = \ - (ElfW(Addr)) (r); \ - } while (0) - -/* Return nonzero iff ELF header is compatible with the running host. */ -static inline int __attribute_used__ -elf_machine_matches_host (const ElfW(Ehdr) *ehdr) -{ -#if _MIPS_SIM == _ABIO32 || _MIPS_SIM == _ABIN32 - /* Don't link o32 and n32 together. */ - if (((ehdr->e_flags & EF_MIPS_ABI2) != 0) != (_MIPS_SIM == _ABIN32)) - return 0; -#endif - - switch (ehdr->e_machine) - { - case EM_MIPS: - case EM_MIPS_RS3_LE: - return 1; - default: - return 0; - } -} - -static inline ElfW(Addr) * -elf_mips_got_from_gpreg (ElfW(Addr) gpreg) -{ - /* FIXME: the offset of gp from GOT may be system-dependent. */ - return (ElfW(Addr) *) (gpreg - OFFSET_GP_GOT); -} - -/* Return the link-time address of _DYNAMIC. Conveniently, this is the - first element of the GOT. This must be inlined in a function which - uses global data. We assume its $gp points to the primary GOT. */ -static inline ElfW(Addr) -elf_machine_dynamic (void) -{ - register ElfW(Addr) gp __asm__ ("$28"); - return *elf_mips_got_from_gpreg (gp); -} - -#define STRINGXP(X) __STRING(X) -#define STRINGXV(X) STRINGV_(X) -#define STRINGV_(...) # __VA_ARGS__ - -/* Return the run-time load address of the shared object. */ -static inline ElfW(Addr) -elf_machine_load_address (void) -{ - ElfW(Addr) addr; - asm (" .set noreorder\n" - " " STRINGXP (PTR_LA) " %0, 0f\n" - " bltzal $0, 0f\n" - " nop\n" - "0: " STRINGXP (PTR_SUBU) " %0, $31, %0\n" - " .set reorder\n" - : "=r" (addr) - : /* No inputs */ - : "$31"); - return addr; -} - -/* The MSB of got[1] of a gnu object is set to identify gnu objects. */ -#if _MIPS_SIM == _ABI64 -# define ELF_MIPS_GNU_GOT1_MASK 0x8000000000000000L -#else -# define ELF_MIPS_GNU_GOT1_MASK 0x80000000L -#endif - -/* We can't rely on elf_machine_got_rel because _dl_object_relocation_scope - fiddles with global data. */ -#define ELF_MACHINE_BEFORE_RTLD_RELOC(dynamic_info) \ -do { \ - struct link_map *map = &bootstrap_map; \ - ElfW(Sym) *sym; \ - ElfW(Addr) *got; \ - int i, n; \ - \ - got = (ElfW(Addr) *) D_PTR (map, l_info[DT_PLTGOT]); \ - \ - if (__builtin_expect (map->l_addr == 0, 1)) \ - break; \ - \ - /* got[0] is reserved. got[1] is also reserved for the dynamic object \ - generated by gnu ld. Skip these reserved entries from \ - relocation. */ \ - i = (got[1] & ELF_MIPS_GNU_GOT1_MASK)? 2 : 1; \ - n = map->l_info[DT_MIPS (LOCAL_GOTNO)]->d_un.d_val; \ - \ - /* Add the run-time displacement to all local got entries. */ \ - while (i < n) \ - got[i++] += map->l_addr; \ - \ - /* Handle global got entries. */ \ - got += n; \ - sym = (ElfW(Sym) *) D_PTR(map, l_info[DT_SYMTAB]) \ - + map->l_info[DT_MIPS (GOTSYM)]->d_un.d_val; \ - i = (map->l_info[DT_MIPS (SYMTABNO)]->d_un.d_val \ - - map->l_info[DT_MIPS (GOTSYM)]->d_un.d_val); \ - \ - while (i--) \ - { \ - if (sym->st_shndx == SHN_UNDEF || sym->st_shndx == SHN_COMMON) \ - *got = map->l_addr + sym->st_value; \ - else if (ELFW(ST_TYPE) (sym->st_info) == STT_FUNC \ - && *got != sym->st_value) \ - *got += map->l_addr; \ - else if (ELFW(ST_TYPE) (sym->st_info) == STT_SECTION) \ - { \ - if (sym->st_other == 0) \ - *got += map->l_addr; \ - } \ - else \ - *got = map->l_addr + sym->st_value; \ - \ - got++; \ - sym++; \ - } \ -} while(0) - - -/* Mask identifying addresses reserved for the user program, - where the dynamic linker should not map anything. */ -#define ELF_MACHINE_USER_ADDRESS_MASK 0x80000000UL - - -/* Initial entry point code for the dynamic linker. - The C function `_dl_start' is the real entry point; - its return value is the user program's entry point. - Note how we have to be careful about two things: - - 1) That we allocate a minimal stack of 24 bytes for - every function call, the MIPS ABI states that even - if all arguments are passed in registers the procedure - called can use the 16 byte area pointed to by $sp - when it is called to store away the arguments passed - to it. - - 2) That under Linux the entry is named __start - and not just plain _start. */ - -#define RTLD_START asm (\ - ".text\n\ - " _RTLD_PROLOGUE(ENTRY_POINT) "\ - " STRINGXV(SETUP_GPX($25)) "\n\ - " STRINGXV(SETUP_GPX64($18,$25)) "\n\ - # i386 ABI book says that the first entry of GOT holds\n\ - # the address of the dynamic structure. Though MIPS ABI\n\ - # doesn't say nothing about this, I emulate this here.\n\ - " STRINGXP(PTR_LA) " $4, _DYNAMIC\n\ - # Subtract OFFSET_GP_GOT\n\ - " STRINGXP(PTR_S) " $4, -0x7ff0($28)\n\ - move $4, $29\n\ - " STRINGXP(PTR_SUBIU) " $29, 16\n\ - \n\ - " STRINGXP(PTR_LA) " $8, .Lcoff\n\ - bltzal $8, .Lcoff\n\ -.Lcoff: " STRINGXP(PTR_SUBU) " $8, $31, $8\n\ - \n\ - " STRINGXP(PTR_LA) " $25, _dl_start\n\ - " STRINGXP(PTR_ADDU) " $25, $8\n\ - jalr $25\n\ - \n\ - " STRINGXP(PTR_ADDIU) " $29, 16\n\ - # Get the value of label '_dl_start_user' in t9 ($25).\n\ - " STRINGXP(PTR_LA) " $25, _dl_start_user\n\ - " _RTLD_EPILOGUE(ENTRY_POINT) "\ - \n\ - \n\ - " _RTLD_PROLOGUE(_dl_start_user) "\ - " STRINGXP(SETUP_GP) "\n\ - " STRINGXV(SETUP_GP64($18,_dl_start_user)) "\n\ - move $16, $28\n\ - # Save the user entry point address in a saved register.\n\ - move $17, $2\n\ - # See if we were run as a command with the executable file\n\ - # name as an extra leading argument.\n\ - lw $2, _dl_skip_args\n\ - beq $2, $0, 1f\n\ - # Load the original argument count.\n\ - " STRINGXP(PTR_L) " $4, 0($29)\n\ - # Subtract _dl_skip_args from it.\n\ - subu $4, $2\n\ - # Adjust the stack pointer to skip _dl_skip_args words.\n\ - sll $2, " STRINGXP (PTRLOG) "\n\ - " STRINGXP(PTR_ADDU) " $29, $2\n\ - # Save back the modified argument count.\n\ - " STRINGXP(PTR_S) " $4, 0($29)\n\ -1: # Call _dl_init (struct link_map *main_map, int argc, char **argv, char **env) \n\ - " STRINGXP(PTR_L) " $4, _rtld_local\n\ - " STRINGXP(PTR_L) /* or lw??? fixme */ " $5, 0($29)\n\ - " STRINGXP(PTR_LA) " $6, " STRINGXP (PTRSIZE) "($29)\n\ - sll $7, $5, " STRINGXP (PTRLOG) "\n\ - " STRINGXP(PTR_ADDU) " $7, $7, $6\n\ - " STRINGXP(PTR_ADDU) " $7, $7, " STRINGXP (PTRSIZE) " \n\ - # Make sure the stack pointer is aligned for _dl_init_internal.\n\ - and $2, $29, -2 * " STRINGXP(SZREG) "\n\ - " STRINGXP(PTR_S) " $29, -" STRINGXP(SZREG) "($2)\n\ - " STRINGXP(PTR_SUBIU) " $29, $2, 32\n\ - " STRINGXP(SAVE_GP(16)) "\n\ - # Call the function to run the initializers.\n\ - jal _dl_init_internal\n\ - # Restore the stack pointer for _start.\n\ - " STRINGXP(PTR_L) " $29, 32-" STRINGXP(SZREG) "($29)\n\ - # Pass our finalizer function to the user in $2 as per ELF ABI.\n\ - " STRINGXP(PTR_LA) " $2, _dl_fini\n\ - # Jump to the user entry point.\n\ - move $25, $17\n\ - jr $25\n\t"\ - _RTLD_EPILOGUE(_dl_start_user)\ - ".previous"\ -); - -/* The MIPS never uses Elfxx_Rela relocations. */ -#define ELF_MACHINE_NO_RELA 1 - -/* Names of the architecture-specific auditing callback functions. */ -# if _MIPS_SIM == _ABIO32 -# define ARCH_LA_PLTENTER mips_o32_gnu_pltenter -# define ARCH_LA_PLTEXIT mips_o32_gnu_pltexit -# elif _MIPS_SIM == _ABIN32 -# define ARCH_LA_PLTENTER mips_n32_gnu_pltenter -# define ARCH_LA_PLTEXIT mips_n32_gnu_pltexit -# else -# define ARCH_LA_PLTENTER mips_n64_gnu_pltenter -# define ARCH_LA_PLTEXIT mips_n64_gnu_pltexit -# endif - -#endif /* !dl_machine_h */ - -#ifdef RESOLVE_MAP - -/* Perform the relocation specified by RELOC and SYM (which is fully resolved). - MAP is the object containing the reloc. */ - -auto inline void -__attribute__ ((always_inline)) -elf_machine_rel (struct link_map *map, const ElfW(Rel) *reloc, - const ElfW(Sym) *sym, const struct r_found_version *version, - void *const reloc_addr) -{ - const unsigned long int r_type = ELFW(R_TYPE) (reloc->r_info); - -#if !defined RTLD_BOOTSTRAP && !defined SHARED - /* This is defined in rtld.c, but nowhere in the static libc.a; - make the reference weak so static programs can still link. This - declaration cannot be done when compiling rtld.c (i.e. #ifdef - RTLD_BOOTSTRAP) because rtld.c contains the common defn for - _dl_rtld_map, which is incompatible with a weak decl in the same - file. */ - weak_extern (GL(dl_rtld_map)); -#endif - - switch (r_type) - { -#if defined (USE_TLS) && !defined (RTLD_BOOTSTRAP) -# if _MIPS_SIM == _ABI64 - case R_MIPS_TLS_DTPMOD64: - case R_MIPS_TLS_DTPREL64: - case R_MIPS_TLS_TPREL64: -# else - case R_MIPS_TLS_DTPMOD32: - case R_MIPS_TLS_DTPREL32: - case R_MIPS_TLS_TPREL32: -# endif - { - struct link_map *sym_map = RESOLVE_MAP (&sym, version, r_type); - Elf32_Addr value = sym == NULL ? 0 : sym_map->l_addr + sym->st_value; - - if (sym) - value += sym->st_value; - - switch (r_type) - { - case R_MIPS_TLS_DTPMOD64: - case R_MIPS_TLS_DTPMOD32: - if (sym_map) - *(ElfW(Word) *)reloc_addr = sym_map->l_tls_modid; - break; - - case R_MIPS_TLS_DTPREL64: - case R_MIPS_TLS_DTPREL32: - *(ElfW(Word) *)reloc_addr += TLS_DTPREL_VALUE (sym); - break; - - case R_MIPS_TLS_TPREL32: - case R_MIPS_TLS_TPREL64: - CHECK_STATIC_TLS (map, sym_map); - *(ElfW(Word) *)reloc_addr += TLS_TPREL_VALUE (sym_map, sym); - break; - } - - break; - } -#endif - -#if _MIPS_SIM == _ABI64 - case (R_MIPS_64 << 8) | R_MIPS_REL32: -#else - case R_MIPS_REL32: -#endif - { - int symidx = ELFW(R_SYM) (reloc->r_info); - ElfW(Addr) reloc_value; - - /* Support relocations on mis-aligned offsets. Should we ever - implement RELA, this should be replaced with an assignment - from reloc->r_addend. */ - __builtin_memcpy (&reloc_value, reloc_addr, sizeof (reloc_value)); - - if (symidx) - { - const ElfW(Word) gotsym - = (const ElfW(Word)) map->l_info[DT_MIPS (GOTSYM)]->d_un.d_val; - - if ((ElfW(Word))symidx < gotsym) - { - /* This wouldn't work for a symbol imported from other - libraries for which there's no GOT entry, but MIPS - requires every symbol referenced in a dynamic - relocation to have a GOT entry in the primary GOT, - so we only get here for locally-defined symbols. - For section symbols, we should *NOT* be adding - sym->st_value (per the definition of the meaning of - S in reloc expressions in the ELF64 MIPS ABI), - since it should have already been added to - reloc_value by the linker, but older versions of - GNU ld didn't add it, and newer versions don't emit - useless relocations to section symbols any more, so - it is safe to keep on adding sym->st_value, even - though it's not ABI compliant. Some day we should - bite the bullet and stop doing this. */ -#ifndef RTLD_BOOTSTRAP - if (map != &GL(dl_rtld_map)) -#endif - reloc_value += sym->st_value + map->l_addr; - } - else - { -#ifndef RTLD_BOOTSTRAP - const ElfW(Addr) *got - = (const ElfW(Addr) *) D_PTR (map, l_info[DT_PLTGOT]); - const ElfW(Word) local_gotno - = (const ElfW(Word)) - map->l_info[DT_MIPS (LOCAL_GOTNO)]->d_un.d_val; - - reloc_value += got[symidx + local_gotno - gotsym]; -#endif - } - } - else -#ifndef RTLD_BOOTSTRAP - if (map != &GL(dl_rtld_map)) -#endif - reloc_value += map->l_addr; - - __builtin_memcpy (reloc_addr, &reloc_value, sizeof (reloc_value)); - } - break; - case R_MIPS_NONE: /* Alright, Wilbur. */ - break; -#if _MIPS_SIM == _ABI64 - case R_MIPS_64: - /* For full compliance with the ELF64 ABI, one must precede the - _REL32/_64 pair of relocations with a _64 relocation, such - that the in-place addend is read as a 64-bit value. IRIX - didn't pick up on this requirement, so we treat the - _REL32/_64 relocation as a 64-bit relocation even if it's by - itself. For ABI compliance, we ignore such _64 dummy - relocations. For RELA, this may be simply removed, since - it's totally unnecessary. */ - if (ELFW(R_SYM) (reloc->r_info) == 0) - break; - /* Fall through. */ -#endif - default: - _dl_reloc_bad_type (map, r_type, 0); - break; - } -} - -auto inline void -__attribute__((always_inline)) -elf_machine_rel_relative (ElfW(Addr) l_addr, const ElfW(Rel) *reloc, - void *const reloc_addr) -{ - /* XXX Nothing to do. There is no relative relocation, right? */ -} - -auto inline void -__attribute__((always_inline)) -elf_machine_lazy_rel (struct link_map *map, - ElfW(Addr) l_addr, const ElfW(Rel) *reloc) -{ - /* Do nothing. */ -} - -auto inline void -__attribute__ ((always_inline)) -elf_machine_rela (struct link_map *map, const ElfW(Rela) *reloc, - const ElfW(Sym) *sym, const struct r_found_version *version, - void *const reloc_addr) -{ -} - -auto inline void -__attribute__((always_inline)) -elf_machine_rela_relative (ElfW(Addr) l_addr, const ElfW(Rela) *reloc, - void *const reloc_addr) -{ -} - -#ifndef RTLD_BOOTSTRAP -/* Relocate GOT. */ -auto inline void -__attribute__((always_inline)) -elf_machine_got_rel (struct link_map *map, int lazy) -{ - ElfW(Addr) *got; - ElfW(Sym) *sym; - const ElfW(Half) *vernum; - int i, n, symidx; - -#define RESOLVE_GOTSYM(sym,vernum,sym_index) \ - ({ \ - const ElfW(Sym) *ref = sym; \ - const struct r_found_version *version \ - = vernum ? &map->l_versions[vernum[sym_index] & 0x7fff] : NULL; \ - struct link_map *sym_map; \ - sym_map = RESOLVE_MAP (&ref, version, R_MIPS_REL32); \ - ref ? sym_map->l_addr + ref->st_value : 0; \ - }) - - if (map->l_info[VERSYMIDX (DT_VERSYM)] != NULL) - vernum = (const void *) D_PTR (map, l_info[VERSYMIDX (DT_VERSYM)]); - else - vernum = NULL; - - got = (ElfW(Addr) *) D_PTR (map, l_info[DT_PLTGOT]); - - n = map->l_info[DT_MIPS (LOCAL_GOTNO)]->d_un.d_val; - /* The dynamic linker's local got entries have already been relocated. */ - if (map != &GL(dl_rtld_map)) - { - /* got[0] is reserved. got[1] is also reserved for the dynamic object - generated by gnu ld. Skip these reserved entries from relocation. */ - i = (got[1] & ELF_MIPS_GNU_GOT1_MASK)? 2 : 1; - - /* Add the run-time displacement to all local got entries if - needed. */ - if (__builtin_expect (map->l_addr != 0, 0)) - { - while (i < n) - got[i++] += map->l_addr; - } - } - - /* Handle global got entries. */ - got += n; - /* Keep track of the symbol index. */ - symidx = map->l_info[DT_MIPS (GOTSYM)]->d_un.d_val; - sym = (ElfW(Sym) *) D_PTR (map, l_info[DT_SYMTAB]) + symidx; - i = (map->l_info[DT_MIPS (SYMTABNO)]->d_un.d_val - - map->l_info[DT_MIPS (GOTSYM)]->d_un.d_val); - - /* This loop doesn't handle Quickstart. */ - while (i--) - { - if (sym->st_shndx == SHN_UNDEF) - { - if (ELFW(ST_TYPE) (sym->st_info) == STT_FUNC - && sym->st_value && lazy) - *got = sym->st_value + map->l_addr; - else - *got = RESOLVE_GOTSYM (sym, vernum, symidx); - } - else if (sym->st_shndx == SHN_COMMON) - *got = RESOLVE_GOTSYM (sym, vernum, symidx); - else if (ELFW(ST_TYPE) (sym->st_info) == STT_FUNC - && *got != sym->st_value - && lazy) - *got += map->l_addr; - else if (ELFW(ST_TYPE) (sym->st_info) == STT_SECTION) - { - if (sym->st_other == 0) - *got += map->l_addr; - } - else - *got = RESOLVE_GOTSYM (sym, vernum, symidx); - - ++got; - ++sym; - ++symidx; - } - -#undef RESOLVE_GOTSYM -} -#endif - -/* Set up the loaded object described by L so its stub function - will jump to the on-demand fixup code __dl_runtime_resolve. */ - -auto inline int -__attribute__((always_inline)) -elf_machine_runtime_setup (struct link_map *l, int lazy, int profile) -{ -# ifndef RTLD_BOOTSTRAP - ElfW(Addr) *got; - extern void _dl_runtime_resolve (ElfW(Word)); - extern int _dl_mips_gnu_objects; - - if (lazy) - { - /* The GOT entries for functions have not yet been filled in. - Their initial contents will arrange when called to put an - offset into the .dynsym section in t8, the return address - in t7 and then jump to _GLOBAL_OFFSET_TABLE[0]. */ - got = (ElfW(Addr) *) D_PTR (l, l_info[DT_PLTGOT]); - - /* This function will get called to fix up the GOT entry indicated by - the register t8, and then jump to the resolved address. */ - got[0] = (ElfW(Addr)) &_dl_runtime_resolve; - - /* Store l to _GLOBAL_OFFSET_TABLE[1] for gnu object. The MSB - of got[1] of a gnu object is set to identify gnu objects. - Where we can store l for non gnu objects? XXX */ - if ((got[1] & ELF_MIPS_GNU_GOT1_MASK) != 0) - got[1] = ((ElfW(Addr)) l | ELF_MIPS_GNU_GOT1_MASK); - else - _dl_mips_gnu_objects = 0; - } - - /* Relocate global offset table. */ - elf_machine_got_rel (l, lazy); - -# endif - return lazy; -} - -#endif /* RESOLVE_MAP */ |