mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-30 00:31:08 +00:00
41bdb6e20c
2001-07-06 Paul Eggert <eggert@twinsun.com> * manual/argp.texi: Remove ignored LGPL copyright notice; it's not appropriate for documentation anyway. * manual/libc-texinfo.sh: "Library General Public License" -> "Lesser General Public License". 2001-07-06 Andreas Jaeger <aj@suse.de> * All files under GPL/LGPL version 2: Place under LGPL version 2.1.
99 lines
3.2 KiB
ArmAsm
99 lines
3.2 KiB
ArmAsm
/* Startup code compliant to the ELF i386 ABI.
|
|
Copyright (C) 1995,1996,1997,1998,2000,2001 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.
|
|
|
|
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, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
/* 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
|
|
*/
|
|
|
|
#include "bp-sym.h"
|
|
|
|
.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. */
|
|
|
|
/* Push address of our own entry points to .fini and .init. */
|
|
pushl $_fini
|
|
pushl $_init
|
|
|
|
pushl %ecx /* Push second argument: argv. */
|
|
pushl %esi /* Push first argument: argc. */
|
|
|
|
pushl $BP_SYM (main)
|
|
|
|
/* Call the user's main function, and exit with its value.
|
|
But let the libc call main. */
|
|
call BP_SYM (__libc_start_main)
|
|
|
|
hlt /* Crash if somehow `exit' does return. */
|
|
|
|
/* 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
|
|
|
|
/* 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
|