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100 lines
2.5 KiB
PHP
100 lines
2.5 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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procedure PASCALMAIN; external name 'PASCALMAIN';
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{******************************************************************************
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Process start/halt
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******************************************************************************}
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{$asmmode ATT}
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var
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dlexitproc: pointer;
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procedure _FPC_proc_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+4 }
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andl $0xfffffff8,%esp { Align stack }
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movl %eax,operatingsystem_parameter_envp
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movl %ecx,operatingsystem_parameter_argc
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movl %ebx,operatingsystem_parameter_argv
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movl %edx, dlexitproc
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fninit { initialize fpu }
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fwait
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fldcw Default8087CW
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{ Initialize gs for thread local storage }
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// movw %ds,%ax
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// movw %ax,%gs
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{ Save initial stackpointer }
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movl %esp,initialstkptr
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xorl %ebp,%ebp
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call PASCALMAIN
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end;
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procedure _FPC_proc_haltproc; assembler; nostackframe; public name '_haltproc';
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asm
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.Lhaltproc:
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movl dlexitproc,%eax
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testl %eax,%eax
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je .Lnodlexitproc
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call *%eax
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.Lnodlexitproc:
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movl syscall_nr_exit_group,%eax
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{$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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int $0x80
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movl syscall_nr_exit,%eax
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{$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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int $0x80
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jmp .Lhaltproc
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end;
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