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110 lines
3.1 KiB
PHP
110 lines
3.1 KiB
PHP
{
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This file is part of the Free Pascal run time library.
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Copyright (c) 2005 by Michael Van Canneyt, Peter Vreman,
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& Daniel Mantione, members of the Free Pascal development team.
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See the file COPYING.FPC, included in this distribution,
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for details about the copyright.
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This program 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.
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**********************************************************************}
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{
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Linux ELF startup code for Free Pascal
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Stack layout at program start:
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nil
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envn
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....
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.... ENVIRONMENT VARIABLES
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env1
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env0
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nil
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argn
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....
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.... COMMAND LINE OPTIONS
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arg1
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arg0
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argc <--- esp
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}
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var
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libc_environ: pchar; external name '__environ';
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libc_fpu_control: word; external name '__fpu_control';
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libc_init_proc: procedure; external name '_init';
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libc_fini_proc: procedure; external name '_fini';
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procedure libc_atexit; external name '__libc_atexit';
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procedure libc_exit; external name '__libc_exit';
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procedure libc_init; external name '__libc_init';
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procedure libc_setfpucw; external name '__setfpucw';
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procedure libc_start_main; external name '__libc_start_main';
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procedure PASCALMAIN; external name 'PASCALMAIN';
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{******************************************************************************
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C library start/halt
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******************************************************************************}
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{$asmmode ATT}
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procedure _FPC_libc_start; assembler; nostackframe; public name '_start';
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asm
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{ First locate the start of the environment variables }
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popl %ecx { Get argc in ecx }
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movl %esp,%ebx { Esp now points to the arguments }
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leal 4(%esp,%ecx,4),%eax { The start of the environment is: esp+4*eax+8 }
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andl $0xfffffff8,%esp { Align stack }
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movl %eax,operatingsystem_parameter_envp { Move the environment pointer }
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movl %ecx,operatingsystem_parameter_argc { Move the argument counter }
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movl %ebx,operatingsystem_parameter_argv { Move the argument pointer }
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movl %eax,libc_environ { libc environ }
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pushl %eax
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pushl %ebx
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pushl %ecx
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call libc_init { init libc }
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movzwl libc_fpu_control,%eax
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pushl %eax
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call libc_setfpucw
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popl %eax
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pushl $libc_fini_proc
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call libc_atexit
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popl %eax
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call libc_init_proc
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popl %eax
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popl %eax
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{ Save initial stackpointer }
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movl %esp,initialstkptr
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xorl %ebp,%ebp
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call PASCALMAIN { start the program }
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end;
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procedure _FPC_libc_haltproc; assembler; nostackframe; public name '_haltproc';
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asm
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.Lhaltproc:
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{$if sizeof(ExitCode)=2}
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movzwl ExitCode,%ebx
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{$else}
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mov ExitCode,%ebx
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{$endif}
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pushl %ebx
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call libc_exit
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xorl %eax,%eax
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incl %eax { eax=1, exit call }
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popl %ebx
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int $0x80
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jmp .Lhaltproc
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end;
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