5059ab35f3
git-svn-id: https://svn.disconnected-by-peer.at/svn/linamh/trunk/linamh@1552 6952d904-891a-0410-993b-d76249ca496b
130 lines
4.1 KiB
Diff
130 lines
4.1 KiB
Diff
--- sysdeps/i386/elf/start.S.orig 1969-12-31 19:00:00.000000000 -0500
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+++ sysdeps/i386/elf/start.S 2004-08-08 10:07:01.718652784 -0400
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@@ -0,0 +1,126 @@
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+/* Startup code compliant to the ELF i386 ABI.
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+ Copyright (C) 1995, 1996, 1997, 1998, 2000, 2001, 2002, 2003, 2004
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+ Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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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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+
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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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+
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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, write to the Free
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+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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+ 02111-1307 USA. */
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+
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+/* This is the canonical entry point, usually the first thing in the text
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+ segment. The SVR4/i386 ABI (pages 3-31, 3-32) says that when the entry
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+ point runs, most registers' values are unspecified, except for:
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+
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+ %edx Contains a function pointer to be registered with `atexit'.
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+ This is how the dynamic linker arranges to have DT_FINI
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+ functions called for shared libraries that have been loaded
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+ before this code runs.
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+
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+ %esp The stack contains the arguments and environment:
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+ 0(%esp) argc
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+ 4(%esp) argv[0]
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+ ...
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+ (4*argc)(%esp) NULL
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+ (4*(argc+1))(%esp) envp[0]
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+ ...
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+ NULL
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+*/
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+
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+#include "bp-sym.h"
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+
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+ .text
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+ .globl _start
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+ .type _start,@function
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+_start:
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+ /* Clear the frame pointer. The ABI suggests this be done, to mark
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+ the outermost frame obviously. */
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+ xorl %ebp, %ebp
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+
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+ /* Extract the arguments as encoded on the stack and set up
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+ the arguments for `main': argc, argv. envp will be determined
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+ later in __libc_start_main. */
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+ popl %esi /* Pop the argument count. */
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+ movl %esp, %ecx /* argv starts just at the current stack top.*/
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+
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+ /* Before pushing the arguments align the stack to a 16-byte
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+ (SSE needs 16-byte alignment) boundary to avoid penalties from
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+ misaligned accesses. Thanks to Edward Seidl <seidl@janed.com>
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+ for pointing this out. */
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+ andl $0xfffffff0, %esp
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+ pushl %eax /* Push garbage because we allocate
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+ 28 more bytes. */
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+
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+ /* Provide the highest stack address to the user code (for stacks
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+ which grow downwards). */
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+ pushl %esp
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+
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+ pushl %edx /* Push address of the shared library
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+ termination function. */
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+
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+#ifdef SHARED
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+ /* Load PIC register. */
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+ call 1f
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+ addl $_GLOBAL_OFFSET_TABLE_, %ebx
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+
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+ /* Push address of our own entry points to .fini and .init. */
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+ leal __libc_csu_fini@GOTOFF(%ebx), %eax
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+ pushl %eax
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+ leal __libc_csu_init@GOTOFF(%ebx), %eax
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+ pushl %eax
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+
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+ pushl %ecx /* Push second argument: argv. */
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+ pushl %esi /* Push first argument: argc. */
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+
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+ pushl BP_SYM (main)@GOT(%ebx)
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+
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+ /* Call the user's main function, and exit with its value.
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+ But let the libc call main. */
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+ call BP_SYM (__libc_start_main)@PLT
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+#else
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+ /* Push address of our own entry points to .fini and .init. */
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+ pushl $__libc_csu_fini
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+ pushl $__libc_csu_init
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+
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+ pushl %ecx /* Push second argument: argv. */
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+ pushl %esi /* Push first argument: argc. */
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+
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+ pushl $BP_SYM (main)
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+
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+ /* Call the user's main function, and exit with its value.
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+ But let the libc call main. */
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+ call BP_SYM (__libc_start_main)
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+#endif
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+
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+ hlt /* Crash if somehow `exit' does return. */
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+
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+#ifdef SHARED
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+1: movl (%esp), %ebx
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+ ret
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+#endif
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+
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+/* To fulfill the System V/i386 ABI we need this symbol. Yuck, it's so
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+ meaningless since we don't support machines < 80386. */
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+ .section .rodata
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+ .globl _fp_hw
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+_fp_hw: .long 3
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+ .size _fp_hw, 4
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+ .type _fp_hw,@object
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+
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+/* Define a symbol for the first piece of initialized data. */
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+ .data
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+ .globl __data_start
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+__data_start:
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+ .long 0
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+ .weak data_start
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+ data_start = __data_start
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