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87 lines
2.9 KiB
C
87 lines
2.9 KiB
C
/* Machine-dependent ELF dynamic relocation inline functions. x32 version.
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Copyright (C) 2012-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/* Must allow <sysdeps/x86_64/dl-machine.h> to be included more than once.
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See #ifdef RESOLVE_MAP in sysdeps/x86_64/dl-machine.h. */
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#include <sysdeps/x86_64/dl-machine.h>
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#ifndef _X32_DL_MACHINE_H
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#define _X32_DL_MACHINE_H
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#undef ARCH_LA_PLTENTER
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#undef ARCH_LA_PLTEXIT
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#undef RTLD_START
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/* Names of the architecture-specific auditing callback functions. */
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#define ARCH_LA_PLTENTER x32_gnu_pltenter
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#define ARCH_LA_PLTEXIT x32_gnu_pltexit
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/* Initial entry point code for the dynamic linker.
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The C function `_dl_start' is the real entry point;
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its return value is the user program's entry point. */
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#define RTLD_START asm ("\n\
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.text\n\
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.p2align 4\n\
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.globl _start\n\
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.globl _dl_start_user\n\
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_start:\n\
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movl %esp, %edi\n\
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call _dl_start\n\
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_dl_start_user:\n\
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# Save the user entry point address in %r12.\n\
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movl %eax, %r12d\n\
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# See if we were run as a command with the executable file\n\
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# name as an extra leading argument.\n\
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movl _dl_skip_args(%rip), %eax\n\
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# Pop the original argument count.\n\
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movl (%rsp), %edx\n\
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# Adjust the stack pointer to skip _dl_skip_args words.\n\
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lea 4(%rsp,%rax,4), %esp\n\
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# Subtract _dl_skip_args from argc.\n\
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subl %eax, %edx\n\
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# Push argc back on the stack.\n\
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subl $4, %esp\n\
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movl %edx, (%rsp)\n\
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# Call _dl_init (struct link_map *main_map, int argc, char **argv, char **env)\n\
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# argc -> rsi\n\
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movl %edx, %esi\n\
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# Save %rsp value in %r13.\n\
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movl %esp, %r13d\n\
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# And align stack for the _dl_init call.\n\
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and $-16, %esp\n\
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# _dl_loaded -> rdi\n\
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movl _rtld_local(%rip), %edi\n\
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# env -> rcx\n\
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lea 8(%r13,%rdx,4), %ecx\n\
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# argv -> rdx\n\
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lea 4(%r13), %edx\n\
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# Clear %rbp to mark outermost frame obviously even for constructors.\n\
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xorl %ebp, %ebp\n\
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# Call the function to run the initializers.\n\
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call _dl_init\n\
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# Pass our finalizer function to the user in %rdx, as per ELF ABI.\n\
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lea _dl_fini(%rip), %edx\n\
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# And make sure %rsp points to argc stored on the stack.\n\
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movl %r13d, %esp\n\
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# Jump to the user's entry point.\n\
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jmp *%r12\n\
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.previous\n\
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");
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#endif /* !_X32_DL_MACHINE_H */
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