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{
This file is part of the Free Pascal run time library.
Copyright (c) 2005 by Michael Van Canneyt, Peter Vreman,
& Daniel Mantione, 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.
**********************************************************************}
{$asmmode att}
{$goto on}
{
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
}
procedure PASCALMAIN; external name 'PASCALMAIN';
function get1eipasebx : pointer; compilerproc; nostackframe; assembler;
asm
movl (%esp),%ebx
ret
end;
{******************************************************************************
Shared library start/halt
******************************************************************************}
procedure _FPC_shared_lib_start(argc : dword;argv,envp : pointer); cdecl; public name 'FPC_SHARED_LIB_START'; public name '_start';
begin
operatingsystem_parameter_argc:=argc; { Copy the argument count }
operatingsystem_parameter_argv:=argv; { Copy the argument pointer }
operatingsystem_parameter_envp:=envp; { Copy the environment pointer }
IsLibrary:=true;
asm
{ Save initial stackpointer }
{$ifdef FPC_PIC}
call get1eipasebx
addl $_GLOBAL_OFFSET_TABLE_,%ebx
movl initialstkptr@GOT(%ebx),%ecx
movl %esp,(%ecx)
{$else FPC_PIC}
movl %esp,initialstkptr
{$endif FPC_PIC}
end;
PASCALMAIN;
end;
{ this routine is only called when the halt() routine of the RTL embedded in
the shared library is called }
procedure _FPC_shared_lib_haltproc; assembler; nostackframe; public name 'FPC_SHARED_LIB_EXIT'; public name '_haltproc';
asm
.Lhaltproc:
{$ifdef FPC_PIC}
call get1eipasebx
addl $_GLOBAL_OFFSET_TABLE_,%ebx
movl ExitCode@GOT(%ebx),%ebx
{$if sizeof(ExitCode)=2}
movzwl (%ebx),%ebx
{$else}
mov (%ebx),%ebx
{$endif}
{$else FPC_PIC}
{$if sizeof(ExitCode)=2}
movzwl ExitCode,%ebx
{$else}
mov ExitCode,%ebx
{$endif}
{$endif FPC_PIC}
xorl %eax,%eax
incl %eax { eax=1, exit call }
int $0x80
jmp .Lhaltproc
end;
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