| /* Machine-dependent ELF dynamic relocation inline functions. m68k version. |
| Copyright (C) 1996-2014 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 "m68k" |
| |
| #include <sys/param.h> |
| #include <sysdep.h> |
| #include <dl-tls.h> |
| |
| /* 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_68K; |
| } |
| |
| |
| /* Return the link-time address of _DYNAMIC. |
| This must be inlined in a function which uses global data. */ |
| static inline Elf32_Addr |
| elf_machine_dynamic (void) |
| { |
| Elf32_Addr addr; |
| |
| asm ("move.l _DYNAMIC@GOT.w(%%a5), %0" |
| : "=a" (addr)); |
| return addr; |
| } |
| |
| |
| /* Return the run-time load address of the shared object. */ |
| static inline Elf32_Addr |
| elf_machine_load_address (void) |
| { |
| Elf32_Addr addr; |
| asm (PCREL_OP ("lea", "_dl_start", "%0", "%0", "%%pc") "\n\t" |
| "sub.l _dl_start@GOT.w(%%a5), %0" |
| : "=a" (addr)); |
| return addr; |
| } |
| |
| |
| /* Set up the loaded object described by L so its unrelocated PLT |
| entries will jump to the on-demand fixup code in dl-runtime.c. */ |
| |
| static inline int __attribute__ ((always_inline)) |
| elf_machine_runtime_setup (struct link_map *l, int lazy, int profile) |
| { |
| Elf32_Addr *got; |
| extern void _dl_runtime_resolve (Elf32_Word); |
| extern void _dl_runtime_profile (Elf32_Word); |
| |
| if (l->l_info[DT_JMPREL] && lazy) |
| { |
| /* The GOT entries for functions in the PLT have not yet been |
| filled in. Their initial contents will arrange when called |
| to push an offset into the .rela.plt section, push |
| _GLOBAL_OFFSET_TABLE_[1], and then jump to |
| _GLOBAL_OFFSET_TABLE_[2]. */ |
| got = (Elf32_Addr *) D_PTR (l, l_info[DT_PLTGOT]); |
| got[1] = (Elf32_Addr) l; /* Identify this shared object. */ |
| |
| /* The got[2] entry contains the address of a function which gets |
| called to get the address of a so far unresolved function and |
| jump to it. The profiling extension of the dynamic linker allows |
| to intercept the calls to collect information. In this case we |
| don't store the address in the GOT so that all future calls also |
| end in this function. */ |
| if (profile) |
| { |
| got[2] = (Elf32_Addr) &_dl_runtime_profile; |
| |
| if (GLRO(dl_profile) != NULL |
| && _dl_name_match_p (GLRO(dl_profile), l)) |
| { |
| /* This is the object we are looking for. Say that we really |
| want profiling and the timers are started. */ |
| GL(dl_profile_map) = l; |
| } |
| } |
| else |
| /* This function will get called to fix up the GOT entry indicated by |
| the offset on the stack, and then jump to the resolved address. */ |
| got[2] = (Elf32_Addr) &_dl_runtime_resolve; |
| } |
| |
| return lazy; |
| } |
| |
| #define ELF_MACHINE_RUNTIME_FIXUP_ARGS long int save_a0, long int save_a1 |
| #define ELF_MACHINE_RUNTIME_FIXUP_PARAMS save_a0, save_a1 |
| |
| |
| /* 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. */ |
| |
| #define RTLD_START asm ("\ |
| .text\n\ |
| .globl _start\n\ |
| .type _start,@function\n\ |
| _start:\n\ |
| sub.l %fp, %fp\n\ |
| move.l %sp, -(%sp)\n\ |
| jbsr _dl_start\n\ |
| addq.l #4, %sp\n\ |
| /* FALLTHRU */\n\ |
| \n\ |
| .globl _dl_start_user\n\ |
| .type _dl_start_user,@function\n\ |
| _dl_start_user:\n\ |
| | Save the user entry point address in %a4.\n\ |
| move.l %d0, %a4\n\ |
| | See if we were run as a command with the executable file\n\ |
| | name as an extra leading argument.\n\ |
| " PCREL_OP ("move.l", "_dl_skip_args", "%d0", "%d0", "%pc") "\n\ |
| | Pop the original argument count\n\ |
| move.l (%sp)+, %d1\n\ |
| | Subtract _dl_skip_args from it.\n\ |
| sub.l %d0, %d1\n\ |
| | Adjust the stack pointer to skip _dl_skip_args words.\n\ |
| lea (%sp, %d0*4), %sp\n\ |
| | Push back the modified argument count.\n\ |
| move.l %d1, -(%sp)\n\ |
| # Call _dl_init (struct link_map *main_map, int argc, char **argv, char **env)\n\ |
| pea 8(%sp, %d1*4)\n\ |
| pea 8(%sp)\n\ |
| move.l %d1, -(%sp)\n\ |
| " PCREL_OP ("move.l", "_rtld_local", "-(%sp)", "%d0", "%pc") "\n\ |
| jbsr _dl_init_internal@PLTPC\n\ |
| addq.l #8, %sp\n\ |
| addq.l #8, %sp\n\ |
| | Pass our finalizer function to the user in %a1.\n\ |
| " PCREL_OP ("lea", "_dl_fini", "%a1", "%a1", "%pc") "\n\ |
| | Initialize %fp with the stack pointer.\n\ |
| move.l %sp, %fp\n\ |
| | Jump to the user's entry point.\n\ |
| jmp (%a4)\n\ |
| .size _dl_start_user, . - _dl_start_user\n\ |
| .previous"); |
| |
| /* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry or |
| TLS variable, so undefined references should not be allowed to |
| define the value. |
| ELF_RTYPE_CLASS_NOCOPY iff TYPE should not be allowed to resolve to one |
| of the main executable's symbols, as for a COPY reloc. */ |
| #define elf_machine_type_class(type) \ |
| ((((type) == R_68K_JMP_SLOT \ |
| || (type) == R_68K_TLS_DTPMOD32 \ |
| || (type) == R_68K_TLS_DTPREL32 \ |
| || (type) == R_68K_TLS_TPREL32) * ELF_RTYPE_CLASS_PLT) \ |
| | (((type) == R_68K_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_68K_JMP_SLOT |
| |
| /* The m68k never uses Elf32_Rel relocations. */ |
| #define ELF_MACHINE_NO_REL 1 |
| |
| static inline Elf32_Addr |
| elf_machine_fixup_plt (struct link_map *map, lookup_t t, |
| const Elf32_Rela *reloc, |
| Elf32_Addr *reloc_addr, Elf32_Addr value) |
| { |
| return *reloc_addr = value; |
| } |
| |
| /* Return the final value of a plt relocation. On the m68k the JMP_SLOT |
| relocation ignores the addend. */ |
| static inline Elf32_Addr |
| elf_machine_plt_value (struct link_map *map, const Elf32_Rela *reloc, |
| Elf32_Addr value) |
| { |
| return value; |
| } |
| |
| /* Names of the architecture-specific auditing callback functions. */ |
| #define ARCH_LA_PLTENTER m68k_gnu_pltenter |
| #define ARCH_LA_PLTEXIT m68k_gnu_pltexit |
| |
| #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__ ((unused, 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 unsigned int r_type = ELF32_R_TYPE (reloc->r_info); |
| |
| if (__builtin_expect (r_type == R_68K_RELATIVE, 0)) |
| *reloc_addr = map->l_addr + reloc->r_addend; |
| else |
| { |
| const Elf32_Sym *const refsym = sym; |
| struct link_map *sym_map = RESOLVE_MAP (&sym, version, r_type); |
| Elf32_Addr value = sym == NULL ? 0 : sym_map->l_addr + sym->st_value; |
| |
| switch (r_type) |
| { |
| case R_68K_COPY: |
| if (sym == NULL) |
| /* This can happen in trace mode if an object could not be |
| found. */ |
| break; |
| if (sym->st_size > refsym->st_size |
| || (sym->st_size < refsym->st_size && GLRO(dl_verbose))) |
| { |
| const char *strtab; |
| |
| strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]); |
| _dl_error_printf ("\ |
| %s: Symbol `%s' has different size in shared object, consider re-linking\n", |
| RTLD_PROGNAME, strtab + refsym->st_name); |
| } |
| memcpy (reloc_addr_arg, (void *) value, |
| MIN (sym->st_size, refsym->st_size)); |
| break; |
| case R_68K_GLOB_DAT: |
| case R_68K_JMP_SLOT: |
| *reloc_addr = value; |
| break; |
| case R_68K_8: |
| *(char *) reloc_addr = value + reloc->r_addend; |
| break; |
| case R_68K_16: |
| *(short *) reloc_addr = value + reloc->r_addend; |
| break; |
| case R_68K_32: |
| *reloc_addr = value + reloc->r_addend; |
| break; |
| case R_68K_PC8: |
| *(char *) reloc_addr |
| = value + reloc->r_addend - (Elf32_Addr) reloc_addr; |
| break; |
| case R_68K_PC16: |
| *(short *) reloc_addr |
| = value + reloc->r_addend - (Elf32_Addr) reloc_addr; |
| break; |
| case R_68K_PC32: |
| *reloc_addr = value + reloc->r_addend - (Elf32_Addr) reloc_addr; |
| break; |
| #ifndef RTLD_BOOTSTRAP |
| case R_68K_TLS_DTPMOD32: |
| /* Get the information from the link map returned by the |
| resolv function. */ |
| if (sym_map != NULL) |
| *reloc_addr = sym_map->l_tls_modid; |
| break; |
| case R_68K_TLS_DTPREL32: |
| if (sym != NULL) |
| *reloc_addr = TLS_DTPREL_VALUE (sym, reloc); |
| break; |
| case R_68K_TLS_TPREL32: |
| if (sym != NULL) |
| { |
| CHECK_STATIC_TLS (map, sym_map); |
| *reloc_addr = TLS_TPREL_VALUE (sym_map, sym, reloc); |
| } |
| break; |
| #endif /* !RTLD_BOOTSTRAP */ |
| case R_68K_NONE: /* Alright, Wilbur. */ |
| break; |
| default: |
| _dl_reloc_bad_type (map, r_type, 0); |
| break; |
| } |
| } |
| } |
| |
| auto inline void __attribute__ ((unused, 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__ ((unused, always_inline)) |
| elf_machine_lazy_rel (struct link_map *map, |
| Elf32_Addr l_addr, const Elf32_Rela *reloc, |
| int skip_ifunc) |
| { |
| Elf32_Addr *const reloc_addr = (void *) (l_addr + reloc->r_offset); |
| if (ELF32_R_TYPE (reloc->r_info) == R_68K_JMP_SLOT) |
| *reloc_addr += l_addr; |
| else |
| _dl_reloc_bad_type (map, ELF32_R_TYPE (reloc->r_info), 1); |
| } |
| |
| #endif /* RESOLVE_MAP */ |