diff options
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/x86_64/x32/dl-machine.h | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/sysdeps/x86_64/x32/dl-machine.h b/sysdeps/x86_64/x32/dl-machine.h new file mode 100644 index 0000000000..bdc1f4b1f0 --- /dev/null +++ b/sysdeps/x86_64/x32/dl-machine.h @@ -0,0 +1,86 @@ +/* Machine-dependent ELF dynamic relocation inline functions. x32 version. + Copyright (C) 2012 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/>. */ + +/* Must allow <sysdeps/x86_64/dl-machine.h> to be included more than once. + See #ifdef RESOLVE_MAP in sysdeps/x86_64/dl-machine.h. */ +#include <sysdeps/x86_64/dl-machine.h> + +#ifndef _X32_DL_MACHINE_H +#define _X32_DL_MACHINE_H + +#undef ARCH_LA_PLTENTER +#undef ARCH_LA_PLTEXIT +#undef RTLD_START + +/* Names of the architecture-specific auditing callback functions. */ +#define ARCH_LA_PLTENTER x32_gnu_pltenter +#define ARCH_LA_PLTEXIT x32_gnu_pltexit + +/* 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 ("\n\ +.text\n\ + .p2align 4\n\ +.globl _start\n\ +.globl _dl_start_user\n\ +_start:\n\ + movl %esp, %edi\n\ + call _dl_start\n\ +_dl_start_user:\n\ + # Save the user entry point address in %r12.\n\ + movl %eax, %r12d\n\ + # See if we were run as a command with the executable file\n\ + # name as an extra leading argument.\n\ + movl _dl_skip_args(%rip), %eax\n\ + # Pop the original argument count.\n\ + movl (%rsp), %edx\n\ + # Adjust the stack pointer to skip _dl_skip_args words.\n\ + lea 4(%rsp,%rax,4), %esp\n\ + # Subtract _dl_skip_args from argc.\n\ + subl %eax, %edx\n\ + # Push argc back on the stack.\n\ + subl $4, %esp\n\ + movl %edx, (%rsp)\n\ + # Call _dl_init (struct link_map *main_map, int argc, char **argv, char **env)\n\ + # argc -> rsi\n\ + movl %edx, %esi\n\ + # Save %rsp value in %r13.\n\ + movl %esp, %r13d\n\ + # And align stack for the _dl_init_internal call.\n\ + and $-16, %esp\n\ + # _dl_loaded -> rdi\n\ + movl _rtld_local(%rip), %edi\n\ + # env -> rcx\n\ + lea 8(%r13,%rdx,4), %ecx\n\ + # argv -> rdx\n\ + lea 4(%r13), %edx\n\ + # Clear %rbp to mark outermost frame obviously even for constructors.\n\ + xorl %ebp, %ebp\n\ + # Call the function to run the initializers.\n\ + call _dl_init_internal\n\ + # Pass our finalizer function to the user in %rdx, as per ELF ABI.\n\ + lea _dl_fini(%rip), %edx\n\ + # And make sure %rsp points to argc stored on the stack.\n\ + movl %r13d, %esp\n\ + # Jump to the user's entry point.\n\ + jmp *%r12\n\ +.previous\n\ +"); + +#endif /* !_X32_DL_MACHINE_H */ |