diff options
Diffstat (limited to 'sysdeps/m68k/dl-machine.h')
| -rw-r--r-- | sysdeps/m68k/dl-machine.h | 316 |
1 files changed, 0 insertions, 316 deletions
diff --git a/sysdeps/m68k/dl-machine.h b/sysdeps/m68k/dl-machine.h deleted file mode 100644 index 146c586..0000000 --- a/sysdeps/m68k/dl-machine.h +++ /dev/null @@ -1,316 +0,0 @@ -/* Machine-dependent ELF dynamic relocation inline functions. m68k version. - Copyright (C) 1996-2001, 2002, 2003, 2004 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, write to the Free - Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA - 02111-1307 USA. */ - -#ifndef dl_machine_h -#define dl_machine_h - -#define ELF_MACHINE_NAME "m68k" - -#include <sys/param.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. Conveniently, this is the - first element of the GOT. This must be inlined in a function which - uses global data. */ -static inline Elf32_Addr -elf_machine_dynamic (void) -{ - register Elf32_Addr *got asm ("%a5"); - return *got; -} - - -/* Return the run-time load address of the shared object. */ -static inline Elf32_Addr -elf_machine_load_address (void) -{ - Elf32_Addr addr; - asm ("lea _dl_start(%%pc), %0\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 (_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; -} - -/* This code is used in dl-runtime.c to call the `fixup' function - and then redirect to the address it returns. */ -#define TRAMPOLINE_TEMPLATE(tramp_name, fixup_name) \ -"| Trampoline for " #fixup_name "\n\ - .globl " #tramp_name "\n\ - .type " #tramp_name ", @function\n\ -" #tramp_name ":\n\ - | Save %a0 (struct return address) and %a1.\n\ - move.l %a0, -(%sp)\n\ - move.l %a1, -(%sp)\n\ - | Call the real address resolver.\n\ - jbsr " #fixup_name "\n\ - | Restore register %a0 and %a1.\n\ - move.l (%sp)+, %a1\n\ - move.l (%sp)+, %a0\n\ - | Pop parameters\n\ - addq.l #8, %sp\n\ - | Call real function.\n\ - jmp (%d0)\n\ - .size " #tramp_name ", . - " #tramp_name "\n" -#ifndef PROF -#define ELF_MACHINE_RUNTIME_TRAMPOLINE \ -asm (TRAMPOLINE_TEMPLATE (_dl_runtime_resolve, fixup) \ - TRAMPOLINE_TEMPLATE (_dl_runtime_profile, profile_fixup)); -#else -#define ELF_MACHINE_RUNTIME_TRAMPOLINE \ -asm (TRAMPOLINE_TEMPLATE (_dl_runtime_resolve, fixup) \ - ".globl _dl_runtime_profile\n" \ - ".set _dl_runtime_profile, _dl_runtime_resolve"); -#endif -#define ELF_MACHINE_RUNTIME_FIXUP_ARGS long int save_a0, long int 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\ - 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\ - move.l _dl_skip_args(%pc), %d0\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\ - move.l _rtld_local(%pc), -(%sp)\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\ - lea _dl_fini(%pc), %a1\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, so - PLT entries 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) * 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; -} - -#endif /* !dl_machine_h */ - -#ifdef RESOLVE - -/* 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) -{ - 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; - Elf32_Addr value = RESOLVE (&sym, version, r_type); - if (sym) - value += 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 ?: "<program name unknown>", - 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; - 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) -{ - 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 */ |