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Diffstat (limited to 'sysdeps/i386/start.S')
| -rw-r--r-- | sysdeps/i386/start.S | 139 |
1 files changed, 0 insertions, 139 deletions
diff --git a/sysdeps/i386/start.S b/sysdeps/i386/start.S deleted file mode 100644 index ccb1e2b38f..0000000000 --- a/sysdeps/i386/start.S +++ /dev/null @@ -1,139 +0,0 @@ -/* Startup code compliant to the ELF i386 ABI. - Copyright (C) 1995-2017 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. - - In addition to the permissions in the GNU Lesser General Public - License, the Free Software Foundation gives you unlimited - permission to link the compiled version of this file with other - programs, and to distribute those programs without any restriction - coming from the use of this file. (The GNU Lesser General Public - License restrictions do apply in other respects; for example, they - cover modification of the file, and distribution when not linked - into another program.) - - Note that people who make modified versions of this file are not - obligated to grant this special exception for their modified - versions; it is their choice whether to do so. The GNU Lesser - General Public License gives permission to release a modified - version without this exception; this exception also makes it - possible to release a modified version which carries forward this - exception. - - 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/>. */ - -/* This is the canonical entry point, usually the first thing in the text - segment. The SVR4/i386 ABI (pages 3-31, 3-32) says that when the entry - point runs, most registers' values are unspecified, except for: - - %edx Contains a function pointer to be registered with `atexit'. - This is how the dynamic linker arranges to have DT_FINI - functions called for shared libraries that have been loaded - before this code runs. - - %esp The stack contains the arguments and environment: - 0(%esp) argc - 4(%esp) argv[0] - ... - (4*argc)(%esp) NULL - (4*(argc+1))(%esp) envp[0] - ... - NULL -*/ - - .text - .globl _start - .type _start,@function -_start: - /* Clear the frame pointer. The ABI suggests this be done, to mark - the outermost frame obviously. */ - xorl %ebp, %ebp - - /* Extract the arguments as encoded on the stack and set up - the arguments for `main': argc, argv. envp will be determined - later in __libc_start_main. */ - popl %esi /* Pop the argument count. */ - movl %esp, %ecx /* argv starts just at the current stack top.*/ - - /* Before pushing the arguments align the stack to a 16-byte - (SSE needs 16-byte alignment) boundary to avoid penalties from - misaligned accesses. Thanks to Edward Seidl <seidl@janed.com> - for pointing this out. */ - andl $0xfffffff0, %esp - pushl %eax /* Push garbage because we allocate - 28 more bytes. */ - - /* Provide the highest stack address to the user code (for stacks - which grow downwards). */ - pushl %esp - - pushl %edx /* Push address of the shared library - termination function. */ - -#ifdef SHARED - /* Load PIC register. */ - call 1f - addl $_GLOBAL_OFFSET_TABLE_, %ebx - - /* Push address of our own entry points to .fini and .init. */ - leal __libc_csu_fini@GOTOFF(%ebx), %eax - pushl %eax - leal __libc_csu_init@GOTOFF(%ebx), %eax - pushl %eax - - pushl %ecx /* Push second argument: argv. */ - pushl %esi /* Push first argument: argc. */ - - pushl main@GOT(%ebx) - - /* Call the user's main function, and exit with its value. - But let the libc call main. */ - call __libc_start_main@PLT -#else - /* Push address of our own entry points to .fini and .init. */ - pushl $__libc_csu_fini - pushl $__libc_csu_init - - pushl %ecx /* Push second argument: argv. */ - pushl %esi /* Push first argument: argc. */ - - pushl $main - - /* Call the user's main function, and exit with its value. - But let the libc call main. */ - call __libc_start_main -#endif - - hlt /* Crash if somehow `exit' does return. */ - -#ifdef SHARED -1: movl (%esp), %ebx - ret -#endif - -/* To fulfill the System V/i386 ABI we need this symbol. Yuck, it's so - meaningless since we don't support machines < 80386. */ - .section .rodata - .globl _fp_hw -_fp_hw: .long 3 - .size _fp_hw, 4 - .type _fp_hw,@object - -/* 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 |