1 /* Machine-dependent ELF dynamic relocation inline functions. x32 version. 2 Copyright (C) 2012-2021 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, see 17 <https://www.gnu.org/licenses/>. */ 18 19 /* Must allow <sysdeps/x86_64/dl-machine.h> to be included more than once. 20 See #ifdef RESOLVE_MAP in sysdeps/x86_64/dl-machine.h. */ 21 #include <sysdeps/x86_64/dl-machine.h> 22 23 #ifndef _X32_DL_MACHINE_H 24 #define _X32_DL_MACHINE_H 25 26 #undef ARCH_LA_PLTENTER 27 #undef ARCH_LA_PLTEXIT 28 #undef RTLD_START 29 30 /* Names of the architecture-specific auditing callback functions. */ 31 #define ARCH_LA_PLTENTER x32_gnu_pltenter 32 #define ARCH_LA_PLTEXIT x32_gnu_pltexit 33 34 /* Initial entry point code for the dynamic linker. 35 The C function `_dl_start' is the real entry point; 36 its return value is the user program's entry point. */ 37 #define RTLD_START asm ("\n\ 38 .text\n\ 39 .p2align 4\n\ 40 .globl _start\n\ 41 .globl _dl_start_user\n\ 42 _start:\n\ 43 movl %esp, %edi\n\ 44 call _dl_start\n\ 45 _dl_start_user:\n\ 46 # Save the user entry point address in %r12.\n\ 47 movl %eax, %r12d\n\ 48 # See if we were run as a command with the executable file\n\ 49 # name as an extra leading argument.\n\ 50 movl _dl_skip_args(%rip), %eax\n\ 51 # Pop the original argument count.\n\ 52 movl (%rsp), %edx\n\ 53 # Adjust the stack pointer to skip _dl_skip_args words.\n\ 54 lea 4(%rsp,%rax,4), %esp\n\ 55 # Subtract _dl_skip_args from argc.\n\ 56 subl %eax, %edx\n\ 57 # Push argc back on the stack.\n\ 58 subl $4, %esp\n\ 59 movl %edx, (%rsp)\n\ 60 # Call _dl_init (struct link_map *main_map, int argc, char **argv, char **env)\n\ 61 # argc -> rsi\n\ 62 movl %edx, %esi\n\ 63 # Save %rsp value in %r13.\n\ 64 movl %esp, %r13d\n\ 65 # And align stack for the _dl_init call.\n\ 66 and $-16, %esp\n\ 67 # _dl_loaded -> rdi\n\ 68 movl _rtld_local(%rip), %edi\n\ 69 # env -> rcx\n\ 70 lea 8(%r13,%rdx,4), %ecx\n\ 71 # argv -> rdx\n\ 72 lea 4(%r13), %edx\n\ 73 # Clear %rbp to mark outermost frame obviously even for constructors.\n\ 74 xorl %ebp, %ebp\n\ 75 # Call the function to run the initializers.\n\ 76 call _dl_init\n\ 77 # Pass our finalizer function to the user in %rdx, as per ELF ABI.\n\ 78 lea _dl_fini(%rip), %edx\n\ 79 # And make sure %rsp points to argc stored on the stack.\n\ 80 movl %r13d, %esp\n\ 81 # Jump to the user's entry point.\n\ 82 jmp *%r12\n\ 83 .previous\n\ 84 "); 85 86 #endif /* !_X32_DL_MACHINE_H */ 87