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* Clean up i386-Linux startup code for shared libraries:

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* The initialization code is a normal function called by runtime linker, stack layout at process startup is irrelevant.
  * Stack pointer can be replaced by frame pointer, they are just a few bytes away.
  * IsLibrary is set to true in fpc_libinitializeunits and therefore assigning it here is redundant.
  * The exitcode is passed as argument to haltproc, so messing with PIC is not necessary.

git-svn-id: trunk@26759 -
This commit is contained in:
sergei 2014-02-13 04:54:21 +00:00
parent df6837fa12
commit ead8d0c1d4
1 changed files with 3 additions and 57 deletions
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60
rtl/linux/i386/si_dll.inc
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@ -12,35 +12,9 @@
**********************************************************************}
{$asmmode att}
{$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
@ -52,45 +26,17 @@ 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
{$endif FPC_PIC}
end;
initialstkptr:=get_frame;
PASCALMAIN;
end;
{ this routine is only called when the halt() routine of the RTL embedded in
the shared library is called }
procedure _FPC_shared_lib_haltproc; assembler; nostackframe; public name 'FPC_SHARED_LIB_EXIT'; public name '_haltproc';
procedure _FPC_shared_lib_haltproc(e:longint); cdecl; assembler; nostackframe; public name '_haltproc';
asm
.Lhaltproc:
{$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}
movl e,%ebx
xorl %eax,%eax
incl %eax { eax=1, exit call }
int $0x80