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https://gitlab.com/freepascal.org/fpc/source.git
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151 lines
3.6 KiB
PHP
151 lines
3.6 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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{$asmmode att}
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{
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Linux ELF startup code for Free Pascal
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Stack layout at program start:
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nil
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envn
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....
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.... ENVIRONMENT VARIABLES
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env1
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env0
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nil
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argn
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....
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.... COMMAND LINE OPTIONS
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arg1
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arg0
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argc <--- esp
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}
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{******************************************************************************
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Process start/halt
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******************************************************************************}
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var
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dlexitproc : pointer;
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{$ifdef FPC_PIC}
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procedure fpc_geteipasebxlocal; [external name 'fpc_geteipasebx'];
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{$endif}
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{$ifndef FPC_USE_LIBC}
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procedure InitTLS; [external name 'FPC_INITTLS'];
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{$endif}
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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 $0xfffffff0,%esp { Align stack to 16 bytes }
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{$ifdef FPC_PIC}
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pushl %ebx
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pushl %ecx
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call fpc_geteipasebxlocal
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addl $_GLOBAL_OFFSET_TABLE_,%ebx
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movl operatingsystem_parameter_envp@GOT(%ebx),%ecx
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movl %eax,(%ecx)
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movl operatingsystem_parameter_argc@GOT(%ebx),%edx
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popl %ecx
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movl %ecx,(%edx)
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movl operatingsystem_parameter_argv@GOT(%ebx),%edx
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popl %ebx
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movl %ebx,(%edx)
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{$else FPC_PIC}
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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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{$endif FPC_PIC}
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{ Initialize FPU }
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call SysResetFPU
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{ Save initial stackpointer }
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{$ifdef FPC_PIC}
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pushl %ebx
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call fpc_geteipasebxlocal
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addl $_GLOBAL_OFFSET_TABLE_,%ebx
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movl initialstkptr@GOT(%ebx),%ebx
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movl %esp,(%ebx)
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popl %ebx
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{$else FPC_PIC}
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movl %esp,initialstkptr
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{$endif FPC_PIC}
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{$if (FPC_FULLVERSION>30200) and not defined(FPC_USE_LIBC)}
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call InitTLS
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{$endif FPC_FULLVERSION>30200 and not FPC_USE_LIBC}
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xorl %ebp,%ebp
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call PASCALMAIN
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end;
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procedure _FPC_dynamic_proc_start; assembler; nostackframe; public name '_dynamic_start';
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asm
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{$ifdef FPC_PIC}
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pushl %ebx
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call fpc_geteipasebxlocal
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addl $_GLOBAL_OFFSET_TABLE_,%ebx
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movl dlexitproc@GOT(%ebx),%ebx
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movl %edx,(%ebx)
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popl %ebx
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{$else}
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movl %edx, dlexitproc
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{$endif}
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jmp _FPC_proc_start
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end;
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procedure _FPC_proc_haltproc(e:longint); cdecl; assembler; public name '_haltproc';
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asm
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//addl $12, %esp { align stack back to 16 bytes }
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{$ifdef FPC_PIC}
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call fpc_geteipasebxlocal
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addl $_GLOBAL_OFFSET_TABLE_,%ebx
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movl dlexitproc@GOT(%ebx),%eax
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movl (%eax),%eax
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{$else FPC_PIC}
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movl dlexitproc,%eax
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{$endif FPC_PIC}
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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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movl e,%ebx
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int $0x80
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movl syscall_nr_exit,%eax
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movl e,%ebx
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int $0x80
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jmp .Lnodlexitproc
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end;
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