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{
This file is part of the Free Pascal run time library.
Copyright (c) 2009 by Pierre Muller,
member of the Free Pascal development team.
Program startup
Adapted from source code on opensolaris 2.11
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.
**********************************************************************}
(*
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
*)
(*
/*
* This crt1.o module is provided as the bare minimum required to build
* a 64-bit executable with gcc. It is installed in /usr/lib/amd64
* where it will be picked up by gcc, along with crti.o and crtn.o
*/
.ident "%Z%%M% %I% %E% SMI"
.file "crt1.s"
.globl _start
/* global entities defined elsewhere but used here */
.globl main
.globl __fpstart
.globl exit
.globl _exit
.weak _DYNAMIC
*)
type
TCdeclProcedure = procedure; cdecl;
function atexit(proc:TCdeclProcedure):longint;cdecl;external 'c' name 'atexit'{ @plt };
procedure C_exit;cdecl;external 'c' name 'exit';
procedure _exit;cdecl;external 'c' name '_exit';
//procedure _fini;cdecl;external 'c' name '_fini';
//procedure __fpstart;cdecl;external 'c' name '__fpstart'{ @plt };
//procedure __fsr;cdecl;external 'c' name '__fsr';
//procedure _init;cdecl;external 'c' name '_init';
procedure PascalMain;cdecl;external name 'PASCALMAIN';
{vars are not correctly transformed :(
var
_DYNAMIC : longint; cvar; external;
__Argv : pointer; cvar; external;
environ : pointer; cvar; external;
__get_exit_frame_monitor_ptr : pointer; cvar; external;
__do_exit_code_ptr : pointer; cvar; external;
}
(*
.section .data
.weak environ
.set environ,_environ
.globl _environ
.type _environ,@object
.size _environ,8
.align 8
_environ:
.8byte 0x0
.globl __environ_lock
.type __environ_lock,@object
.size __environ_lock,24
.align 8
__environ_lock:
.zero 24
.globl ___Argv
.type ___Argv,@object
.size ___Argv,8
.align 8
___Argv:
.8byte 0x0
.globl __longdouble_used
.section .data
.align 8
.type __longdouble_used,@object
.size __longdouble_used,4
__longdouble_used:
.4byte 0
*)
var
_environ : pointer; cvar; public;
__environ_lock : Array[0..24-1] of byte; cvar; public;
___Argv : pointer;cvar; public;
__longdouble_used : longint; cvar; public;
var
_DYNAMIC : pointer;cvar;weakexternal;
//procedure _DYNAMIC;cdecl;external 'c' name '_DYNAMIC'; { should be weak }
(*
/*
* The SVR4/i386 ABI (pages 3-29) says that when the entry
* point runs registers' %rbp, %rsp, %rdx values are specified
* the following:
*
* %rbp The content of this register is unspecified at
* process initialization time, but the user code should mark
* the deepest stack frame by setting the frame pointer to zero.
* No other frame's %ebp should have a zero value.
*
* %rsp Performing its usual job, the stack pointer holds the address
* of the bottom of the stack, which is guaranteed to be
* quadword aligned.
*
* The stack contains the arguments and environment:
* ...
* envp[0] (16+(8*argc))(%rsp)
* NULL (8+(8*argc))(%rsp)
* ...
* argv[0] 8(%rsp)
* argc 0(%rsp)
*
* %rdx In a conforming program, this register contains a function
* pointer that the application should register with atexit(BA_OS).
* This function is used for shared object termination code
* [see Dynamic Linking in Chapter 5 of the System V ABI].
*
*/
*)
procedure _start;assembler;nostackframe;public name '_start';
asm
(*
/*
* Allocate a NULL return address and a NULL previous %rbp as if
* there was a genuine call to _start.
*/
*)
pushq $0x0
pushq $0x0
movq %rsp,%rbp
(*
/*
* The stack now is
*
* envp[0] (32+(8*argc))(%rsp) - (A)
* NULL (24+(8*argc))(%rsp)
* ...
* argv[0] 24(%rbp) - (B)
* argc 16(%rbp)
* 0 8(%rbp)
* 0 0(%rbp)
*/
*)
{$ifdef FPC_PIC}
movq _DYNAMIC@GOTPCREL(%rip),%rax
{$else FPC_PIC}
movq $_DYNAMIC,%rax
{$endif FPC_PIC}
testq %rax,%rax
je .Label1
movq %rdx,%rdi { register rt_do_exit }
call atexit{$ifdef FPC_PIC}@PLT{$endif}
.Label1:
(* What should we do about this?
movq $_fini,%rdi
call atexit *)
(*
/*
* Calculate the location of the envp array by adding the size of
* the argv array to the start of the argv array.
*/
*)
movq 0x10(%rbp),%rax
{$ifdef FPC_PIC}
movq argc@GOTPCREL(%rip),%rcx
{$else FPC_PIC}
movq $argc,%rcx
{$endif FPC_PIC}
movl %eax,(%rcx)
{$ifdef FPC_PIC}
movq _environ@GOTPCREL(%rip),%rcx
movq (%rcx),%rcx
{$else FPC_PIC}
movq _environ(%rip),%rcx
{$endif FPC_PIC}
testq %rcx,%rcx
jne .Label3
lea 0x20(%rbp,%rax,8),%rcx
.Label3:
{$ifdef FPC_PIC}
movq _environ@GOTPCREL(%rip),%rbx
movq %rcx,(%rbx)
{$else FPC_PIC}
movq %rcx,_environ(%rip)
{$endif FPC_PIC}
// Specific to Free Pascal
{$ifdef FPC_PIC}
movq envp@GOTPCREL(%rip),%rbx
movq %rcx,(%rbx)
{$else FPC_PIC}
movq %rcx,envp(%rip)
{$endif FPC_PIC}
(*
/*
* Force stack alignment - below here there must have been an even
* number of un-popped pushq instructions whenever a call is reached
*/
*)
andq $-16,%rsp
pushq %rdx
leaq 24(%rbp),%rdx { argv (B) }
{$ifdef FPC_PIC}
movq ___Argv@GOTPCREL(%rip),%rbx
movq %rdx,(%rbx)
{$else FPC_PIC}
movq %rdx,___Argv(%rip)
{$endif FPC_PIC}
{$ifdef FPC_PIC}
movq argv@GOTPCREL(%rip),%rbx
{$else FPC_PIC}
movq $argv,%rbx
{$endif FPC_PIC}
movq %rdx,(%rbx)
pushq %rcx
pushq %rdx
pushq %rax
(* Should this be done, and where?
call __fpstart
call _init *)
popq %rdi
popq %rsi
popq %rdx
popq %rcx
call PASCALMAIN{$ifdef FPC_PIC}@PLT{$endif} { main(argc,argv,envp) }
pushq %rax
pushq %rax
movq %rax,%rdi { and call exit }
call C_exit{$ifdef FPC_PIC}@PLT{$endif}
popq %rdi
popq %rdi
call _exit{$ifdef FPC_PIC}@PLT{$endif} { if user redefined exit, call _exit }
hlt
end;
(*
/*
* The following is here in case any object module compiled with cc -p
* was linked into this module.
*/
.globl _mcount
.section .text
.align 8
.type _mcount,@function
_mcount:
ret
.size _mcount, .-_mcount
*)
|
