diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/dl-machine.h')
| -rw-r--r-- | sysdeps/unix/sysv/linux/dl-machine.h | 214 |
1 files changed, 0 insertions, 214 deletions
diff --git a/sysdeps/unix/sysv/linux/dl-machine.h b/sysdeps/unix/sysv/linux/dl-machine.h deleted file mode 100644 index 2ed6c670e5..0000000000 --- a/sysdeps/unix/sysv/linux/dl-machine.h +++ /dev/null @@ -1,214 +0,0 @@ -/* Machine-dependent ELF dynamic relocation inline functions. - i386/Linux version. -Copyright (C) 1995 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 Library General Public License as -published by the Free Software Foundation; either version 2 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 -Library General Public License for more details. - -You should have received a copy of the GNU Library General Public -License along with the GNU C Library; see the file COPYING.LIB. If -not, write to the Free Software Foundation, Inc., 675 Mass Ave, -Cambridge, MA 02139, USA. */ - -#define ELF_MACHINE_NAME "i386" - -#include <assert.h> -#include <string.h> -#include <link.h> -#include <syscall.h> -#include <sys/mman.h> - -/* Return nonzero iff E_MACHINE is compatible with the running host. */ -static inline int -elf_machine_matches_host (Elf32_Half e_machine) -{ - switch (e_machine) - { - case EM_386: - case EM_486: - return 1; - default: - return 0; - } -} - - -/* Return the run-time address of the _GLOBAL_OFFSET_TABLE_. - Must be inlined in a function which uses global data. */ -static inline Elf32_Addr * -elf_machine_got (void) -{ - register Elf32_Addr *got asm ("%ebx"); - 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 (" call here\n" - "here: popl %0\n" - " subl $here, %0" - : "=r" (addr)); - return addr; -} -/* The `subl' insn above will contain an R_386_32 relocation entry - intended to insert the run-time address of the label `here'. - This will be the first relocation in the text of the dynamic linker; - we skip it to avoid trying to modify read-only text in this early stage. */ -#define ELF_MACHINE_BEFORE_RTLD_RELOC(dynamic_info) \ - ++(const Elf32_Rel *) (dynamic_info)[DT_REL]->d_un.d_ptr; \ - (dynamic_info)[DT_RELSZ]->d_un.d_val -= sizeof (Elf32_Rel) - -/* Perform the relocation specified by RELOC and SYM (which is fully resolved). - MAP is the object containing the reloc. */ - -static inline void -elf_machine_rel (struct link_map *map, - const Elf32_Rel *reloc, - Elf32_Addr sym_loadaddr, const Elf32_Sym *sym) -{ - Elf32_Addr *const reloc_addr = (void *) (map->l_addr + reloc->r_offset); - const Elf32_Addr sym_value = sym_loadaddr + sym->st_value; - - switch (ELF32_R_TYPE (reloc->r_info)) - { - case R_386_COPY: - memcpy (reloc_addr, (void *) sym_value, sym->st_size); - break; - case R_386_GLOB_DAT: - case R_386_JMP_SLOT: - *reloc_addr = sym_value; - break; - case R_386_32: - if (map->l_type == lt_interpreter) - { - /* Undo the relocation done here during bootstrapping. Now we will - relocate it anew, possibly using a binding found in the user - program or a loaded library rather than the dynamic linker's - built-in definitions used while loading those libraries. */ - const Elf32_Sym *const dlsymtab - = (void *) (map->l_addr + map->l_info[DT_SYMTAB]->d_un.d_ptr); - *reloc_addr -= (map->l_addr + - dlsymtab[ELF32_R_SYM (reloc->r_info)].st_value); - } - *reloc_addr += sym_value; - break; - case R_386_RELATIVE: - if (map->l_type != lt_interpreter) /* Already done in dynamic linker. */ - *reloc_addr += map->l_addr; - break; - case R_386_PC32: - *reloc_addr = sym_value - (Elf32_Addr) reloc_addr; - break; - default: - assert (! "unexpected dynamic reloc type"); - break; - } -} - -static inline void -elf_machine_lazy_rel (struct link_map *map, const Elf32_Rel *reloc) -{ - Elf32_Addr *const reloc_addr = (void *) (map->l_addr + reloc->r_offset); - switch (ELF32_R_TYPE (reloc->r_info)) - { - case R_386_JMP_SLOT: - *reloc_addr += map->l_addr; - break; - default: - assert (! "unexpected PLT reloc type"); - break; - } -} - -/* The i386 never uses Elf32_Rela relocations. */ -#define ELF_MACHINE_NO_RELA 1 - - -/* 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 void -elf_machine_runtime_setup (struct link_map *l) -{ - Elf32_Addr *got; - extern void _dl_runtime_resolve (Elf32_Word); - - /* 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 .rel.plt section, push _GLOBAL_OFFSET_TABLE_[1], - and then jump to _GLOBAL_OFFSET_TABLE[2]. */ - got = (Elf32_Addr *) (l->l_addr + l->l_info[DT_PLTGOT]->d_un.d_ptr); - got[1] = (Elf32_Addr) l; /* Identify this shared object. */ - /* 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; -} - - -/* Mask identifying addresses reserved for the user program, - where the dynamic linker should not map anything. */ -#define ELF_MACHINE_USER_ADDRESS_MASK 0xf8000000UL - - - -/* 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\ -.globl _dl_start_user\n\ -_start:\n\ - call _dl_start\n\ -_dl_start_user:\n\ - # Save the user entry point address in %edi.\n\ - movl %eax, %edi\n\ - # Point %ebx at the GOT. - call 0f\n\ -0: popl %ebx\n\ - addl $_GLOBAL_OFFSET_TABLE_+[.-0b], %ebx\n\ - # See if we were run as a command with the executable file\n\ - # name as an extra leading argument.\n\ - movl rtld_command@GOT(%ebx), %eax\n\ - movl (%eax),%eax\n\ - testl %eax,%eax\n\ - jz 0f\n\ - # Pop the original argument count, decrement it, and replace\n\ - # the original first argument pointer with the new count.\n\ - popl %eax\n\ - decl %eax\n\ - movl %eax,(%esp)\n\ - # Call _dl_init_next to return the address of an initializer\n\ - # function to run.\n\ -0: call _dl_init_next@PLT\n\ - # Check for zero return, when out of initializers.\n\ - testl %eax,%eax\n\ - jz 1f\n\ - # Call the shared object initializer function.\n\ - # NOTE: We depend only on the registers (%ebx and %edi)\n\ - # and the return address pushed by this call;\n\ - # the initializer is called with the stack just\n\ - # as it appears on entry, and it is free to move\n\ - # the stack around, as long as it winds up jumping to\n\ - # the return address on the top of the stack.\n\ - call *%eax\n\ - # Loop to call _dl_init_next for the next initializer.\n\ - jmp 0b\n\ -1: # Pass our finalizer function to the user in %edx, as per ELF ABI.\n\ - movl _dl_fini@GOT(%ebx), %edx\n\ - # Jump to the user's entry point.\n\ - jmp *%edi\n\ -"); |