diff options
Diffstat (limited to 'libc/sysdeps/linux/i386/crt0.S')
| -rw-r--r-- | libc/sysdeps/linux/i386/crt0.S | 132 |
1 files changed, 0 insertions, 132 deletions
diff --git a/libc/sysdeps/linux/i386/crt0.S b/libc/sysdeps/linux/i386/crt0.S deleted file mode 100644 index 735d5167f..000000000 --- a/libc/sysdeps/linux/i386/crt0.S +++ /dev/null @@ -1,132 +0,0 @@ -/* Copyright (C) 1991, 1992 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. */ - - -/* Based on the code from GNU libc, but hacked up by John Beppu and Erik Andersen */ -/* adapted by PaX Team for ET_DYN/PIE binaries */ - -/* - When we enter this piece of code, the program stack looks like this: - argc argument counter (integer) - argv[0] program name (pointer) - argv[1...N] program args (pointers) - argv[argc-1] end of args (integer) - NULL - env[0...N] environment variables (pointers) - NULL -*/ - -#include <features.h> - -.text - .align 4 - - .global _start - .type _start,%function -#if defined L_crt0 || defined L_Scrt0 || ! defined __UCLIBC_CTOR_DTOR__ - .type __uClibc_main,%function -#else - .weak _init - .weak _fini - .type __uClibc_start_main,%function -#endif -/* Stick in a dummy reference to main(), so that if an application - * is linking when the main() function is in a static library (.a) - * we can be sure that main() actually gets linked in */ - .type main,%function - -_start: - /* locate the start of the environment variables */ - popl %ecx /* Store argc into %ecx */ - movl %esp,%ebx /* Store argv into ebx */ - movl %esp,%eax /* Store argv into eax as well*/ - movl %edx,%esi /* Store edx(FINI ptr) in %esi */ - movl %ecx,%edx /* Stick argc into %edx so we can do some math in a sec */ - leal 4(%eax,%edx,4),%eax - - /* [ register layout ] - - sizeof(char*) == 4 - %ecx = argc ; 0(esp) - %ebx = argv ; 4(esp) - %eax = env ; argv + (argc * 4) + 4 - */ - - /* Set up an invalid (NULL return address, NULL frame pointer) - callers stack frame so anybody unrolling the stack knows where - to stop */ - xorl %ebp,%ebp /* NULL */ - pushl %ebp /* callers %cs */ - pushl %ebp /* callers %eip (return address) */ - pushl %ebp /* callers %ebp (frame pointer) */ - movl %esp,%ebp /* mark callers stack frame as invalid */ - -#if defined L_Scrt0 || defined L_Scrt1 - call .L0 -.L0: - pop %edx - addl $_GLOBAL_OFFSET_TABLE_+[.-.L0],%edx -#endif - pushl %esi /* Push FINI pointer */ -#if (defined L_crt1 || defined L_Scrt1) && defined __UCLIBC_CTOR_DTOR__ - /* Push .init and .fini arguments to __uClibc_start_main() on the stack */ -#ifdef L_Scrt1 - pushl _fini@GOT(%edx) - pushl _init@GOT(%edx) -#else - pushl $_fini - pushl $_init -#endif - - /* Push envp, argc, and argc arguments to __uClibc_start_main() on the stack */ - pushl %eax /* Environment pointer */ - pushl %ebx /* Argument pointer */ - pushl %ecx /* And the argument count */ - - /* Ok, now run uClibc's main() -- shouldn't return */ -#ifdef L_Scrt1 - call *__uClibc_start_main@GOT(%edx) -#else - call __uClibc_start_main -#endif -#else - /* Push envp, argc, and argc arguments to __uClibc_start_main() on the stack */ - pushl %eax /* Environment pointer */ - pushl %ebx /* Argument pointer */ - pushl %ecx /* And the argument count */ - -#ifdef L_Scrt0 - call *__uClibc_main@GOT(%edx) -#else - call __uClibc_main -#endif -#endif - - /* Crash if somehow `exit' returns anyways. */ - hlt -.size _start,.-_start - - -/* Define a symbol for the first piece of initialized data. */ - .data - .globl __data_start -__data_start: - .long 0 - .weak data_start - data_start = __data_start - |