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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.
**********************************************************************}
{
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
}
var
gmon_etext: pointer; external name '_etext';
gmon_monstarted: longint = 0;
procedure gmon_monstartup; external name 'monstartup';
procedure gmon_mcleanup; external name '_mcleanup';
procedure libc_atexit; external name '__libc_atexit';
procedure libc_exit; external name '__libc_exit';
procedure libc_init; external name '__libc_init';
procedure libc_setfpucw; external name '__setfpucw';
procedure libc_start_main; external name '__libc_start_main';
procedure PASCALMAIN; external name 'PASCALMAIN';
{******************************************************************************
Process + profiling start/halt
******************************************************************************}
{$asmmode ATT}
procedure _FPC_proc_gprof_start; assembler; nostackframe; public name '_start';
asm
{ First locate the start of the environment variables }
popl %ecx
movl %esp,%ebx { Points to the arguments }
movl %ecx,%eax
incl %eax
shll $2,%eax
addl %esp,%eax
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 }
finit { initialize fpu }
fwait
fldcw Default8087CW
pushl $gmon_etext { Initialize gmon }
pushl $_FPC_proc_gprof_start
call gmon_monstartup
addl $8,%esp
pushl $gmon_mcleanup
call libc_atexit
addl $4,%esp
{ Save initial stackpointer }
movl %esp,initialstkptr
xorl %ebp,%ebp
call PASCALMAIN
end;
procedure _FPC_proc_gprof_haltproc; assembler; nostackframe; public name '_haltproc';
asm
.Lhaltproc:
{$ifdef FPC_PIC}
call fpc_geteipasebx
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}
pushl %ebx
call libc_exit { call libc exit, this will write the gmon.out }
movl syscall_nr_exit_group,%eax
popl %ebx
int $0x80
jmp .Lhaltproc
end;
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