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#
# This file is part of the Free Pascal run time library.
# Copyright (c) 1999-2000 by Michael Van Canneyt and Peter Vreman
# members of the Free Pascal development team.
#
# See the file COPYING.FPC, included in this distribution,
# for details about the copyright.
#
# This program 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.
#
#**********************************************************************}
#
# Linux ELF startup code for Free Pascal
#
#
# Stack layout at program start:
#
# nil
# envn
# ....
# .... ENVIRONMENT VARIABLES
# env1
# env0
# nil
# argn
# ....
# .... COMMAND LINE OPTIONS
# arg1
# arg0
# argc <--- esp
#
.file "cprt0.as"
.text
.globl _start
.type _start,@function
_start:
/* First locate the start of the environment variables */
popl %ecx /* Get argc in ecx */
movl %esp,%ebx /* Esp now points to the arguments */
leal 4(%esp,%ecx,4),%eax /* The start of the environment is: esp+4*eax+8 */
andl $0xfffffff8,%esp /* Align stack */
movl %eax,operatingsystem_parameter_envp /* Move the environment pointer */
movl %ecx,operatingsystem_parameter_argc /* Move the argument counter */
movl %ebx,operatingsystem_parameter_argv /* Move the argument pointer */
movl %eax,__environ /* libc environ */
pushl %eax
pushl %ebx
pushl %ecx
call __libc_init /* init libc */
movzwl __fpu_control,%eax
pushl %eax
call __setfpucw
popl %eax
pushl $_fini
call atexit
popl %eax
call _init
popl %eax
popl %eax
/* Save initial stackpointer */
movl %esp,__stkptr
xorl %ebp,%ebp
call PASCALMAIN /* start the program */
.globl _haltproc
.type _haltproc,@function
_haltproc:
_haltproc2: # GAS <= 2.15 bug: generates larger jump if a label is exported
movzwl operatingsystem_result,%ebx
pushl %ebx
call exit
xorl %eax,%eax
incl %eax /* eax=1, exit call */
popl %ebx
int $0x80
jmp _haltproc2
.data
.bss
.type __stkptr,@object
.size __stkptr,4
.global __stkptr
__stkptr:
.skip 4
.type operatingsystem_parameters,@object
.size operatingsystem_parameters,12
operatingsystem_parameters:
.skip 3*4
.global operatingsystem_parameter_envp
.global operatingsystem_parameter_argc
.global operatingsystem_parameter_argv
.set operatingsystem_parameter_envp,operatingsystem_parameters+0
.set operatingsystem_parameter_argc,operatingsystem_parameters+4
.set operatingsystem_parameter_argv,operatingsystem_parameters+8
.section .note.GNU-stack,"",%progbits
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