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* the OpenBSD x86_64 C library startup code converted to Pascal

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git-svn-id: trunk@41739 -
This commit is contained in:
nickysn 2019-03-19 14:58:46 +00:00
parent 76623648e4
commit d1a91a380b
1 changed files with 32 additions and 77 deletions
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109
rtl/openbsd/x86_64/si_c.inc
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@ -30,7 +30,7 @@ function atexit(proc: TCdeclProcedure): cint; cdecl; external name 'atexit';
procedure monstartup(lowpc, highpc: u_long); cdecl; external name 'monstartup';
procedure _init; cdecl; external name '_init';
procedure _FPC_proc___start; forward;
procedure _FPC_proc___start(argc: LongInt; argv: PPChar; envp: Pointer; para1, para2, para3: QWord); forward;
procedure _FPC_proc_start; assembler; nostackframe; public name '_start'; public name '__start';
asm
@ -49,82 +49,37 @@ procedure _FPC_proc_start; assembler; nostackframe; public name '_start'; public
procedure _FPC_proc_haltproc; forward;
function _strrchr(str: PChar; character: LongInt): PChar; forward;
procedure _FPC_proc___start; assembler; nostackframe; public name '___start';
asm
pushq %rbp
movq %rsp, %rbp
subq $64, %rsp
movl %edi, -20(%rbp) { argc }
movq %rsi, -32(%rbp) { argv }
movq %rdx, -40(%rbp) { environment }
movq %rcx, -48(%rbp) { ??? }
movq %r8, -56(%rbp) { ??? }
movq %r9, -64(%rbp) { ??? }
movq -40(%rbp), %rax
movq %rax, environ(%rip)
movq %rax,operatingsystem_parameter_envp(%rip)
movq -32(%rbp), %rax
movq (%rax), %rax
movq %rax, -8(%rbp)
cmpq $0, -8(%rbp)
je .L2
movq -8(%rbp), %rdi
movl $47, %esi
call _strrchr
movq %rax, __progname(%rip)
movq __progname(%rip), %rax
testq %rax, %rax
jne .L4
movq -8(%rbp), %rax
movq %rax, __progname(%rip)
jmp .L6
.L4:
movq __progname(%rip), %rax
addq $1, %rax
movq %rax, __progname(%rip)
.L6:
leaq __progname_storage(%rip), %rax
movq %rax, -16(%rbp)
jmp .L7
.L8:
movq __progname(%rip), %rcx
movzbl (%rcx), %edx
movq -16(%rbp), %rax
movb %dl, (%rax)
addq $1, -16(%rbp)
leaq 1(%rcx), %rax
movq %rax, __progname(%rip)
.L7:
movq __progname(%rip), %rax
movzbl (%rax), %eax
testb %al, %al
je .L9
leaq __progname_storage+255(%rip), %rax
cmpq %rax, -16(%rbp)
jb .L8
.L9:
leaq __progname_storage(%rip), %rax
movq %rax, __progname(%rip)
movq -16(%rbp), %rax
movb $0, (%rax)
.L2:
movq _mcleanup@GOTPCREL(%rip), %rdi
call atexit
movq _etext@GOTPCREL(%rip), %rsi
movq _eprol(%rip), %rdi
call monstartup@plt
movl $0, %eax
call _init
movq environ(%rip), %rdx
movq -32(%rbp), %rsi
movl -20(%rbp), %edi
movq %rdi,operatingsystem_parameter_argc(%rip)
movq %rsi,operatingsystem_parameter_argv(%rip)
movl $0, %eax
call PASCALMAIN
// movl %eax, %edi
// call exit
jmp _FPC_proc_haltproc
procedure _FPC_proc___start(argc: LongInt; argv: PPChar; envp: Pointer; para1, para2, para3: QWord); public name '___start';
var
I: SizeUInt;
begin
environ:=envp;
operatingsystem_parameter_envp:=envp;
operatingsystem_parameter_argc:=argc;
operatingsystem_parameter_argv:=argv;
if argv[0]<>nil then
begin
__progname:=_strrchr(argv[0], Ord('/'));
if __progname<>nil then
Inc(__progname)
else
__progname:=argv[0];
I:=Low(__progname_storage);
while (I<High(__progname_storage)) and (__progname[I]<>#0) do
begin
__progname_storage[I]:=__progname[I-Low(__progname_storage)];
Inc(I);
end;
__progname_storage[I]:=#0;
__progname:=@__progname_storage;
end;
atexit(@_mcleanup);
monstartup(u_long(@_eprol),u_long(@_etext));
_init;
PascalMain;
asm
jmp _FPC_proc_haltproc
end;
end;
procedure _FPC_proc_haltproc; assembler; nostackframe; public name '_haltproc';