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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
%rdx Contains a function pointer to be registered with `atexit'.
This is how the dynamic linker arranges to have DT_FINI
functions called for shared libraries that have been loaded
before this code runs.
%rsp The stack contains the arguments and environment:
0(%rsp) argc
8(%rsp) argv[0]
...
(8*argc)(%rsp) NULL
(8*(argc+1))(%rsp) envp[0]
...
NULL
}
procedure PASCALMAIN; external name 'PASCALMAIN';
{******************************************************************************
Process start/halt
******************************************************************************}
var
dlexitproc: pointer;
procedure _FPC_proc_start; assembler; nostackframe; public name '_start';
asm
popq %rsi { Pop the argument count. }
movq %rsi,operatingsystem_parameter_argc
movq %rsp,operatingsystem_parameter_argv { argv starts just at the current stack top. }
leaq 8(,%rsi,8),%rax
addq %rsp,%rax
movq %rax,operatingsystem_parameter_envp
andq $0xfffffffffffffff0,%rsp { Align the stack to a 16 byte boundary to follow the ABI. }
{ Save initial stackpointer }
movq %rsp,__stkptr
xorq %rbp, %rbp
call PASCALMAIN
end;
procedure _FPC_dynamic_proc_start; assembler; nostackframe; public name '_dynamic_start';
asm
movq %rdx,dlexitproc
jmp _FPC_proc_start
end;
procedure _FPC_proc_haltproc; assembler; nostackframe; public name '_haltproc';
asm
movq dlexitproc,%rdx
testq %rdx,%rdx
jz .Lhaltproc
call *%rdx
.Lhaltproc:
movl $231,%eax { exit_group call }
movzwl operatingsystem_result,%edi
syscall
jmp .Lhaltproc
{ We need this stuff to make gdb behave itself, otherwise
gdb will chokes with SIGILL when trying to debug apps.
}
.section ".note.ABI-tag", "a"
.align 4
.long 1f - 0f
.long 3f - 2f
.long 1
0: .asciz "GNU"
1: .align 4
2: .long 0
.long 2,4,0
3: .align 4
.section .note.GNU-stack,"",@progbits
end;
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