mirror of
https://github.com/moparisthebest/Simba
synced 2024-11-24 18:22:25 -05:00
313 lines
10 KiB
PHP
313 lines
10 KiB
PHP
{ implementation of the arm procedure call standard for function calls in pascal script
|
|
Copyright (c) 2008 by Henry Vermaak (henry.vermaak@gmail.com)
|
|
|
|
todo: add eabi (define FPC_ABI_EABI) and wince support
|
|
|
|
notes:
|
|
|
|
most arm cpus don't allow unaligned access. by default (?) the linux kernel
|
|
is set up to try and correct unaligned access, which can lead to strange behaviour.
|
|
to turn this off, try (as root):
|
|
|
|
echo 4 > /proc/cpu/alignment
|
|
|
|
if you have an alignment problem, you will now get a crash with a backtrace like this:
|
|
(make sure you compile with -O- -gl)
|
|
|
|
An unhandled exception occurred at $0006C014 :
|
|
EBusError : Bus error or misaligned data access
|
|
$0006C014 PROCESSREPEAT, line 9670 of upscompiler.pas
|
|
$00068AAC TPSPASCALCOMPILER__PROCESSSUB, line 10459 of upscompiler.pas
|
|
$0007D0B4 TPSPASCALCOMPILER__COMPILE, line 11704 of upscompiler.pas
|
|
|
|
you can fix this by using the "unaligned" keyword around the pointer operation.
|
|
search for occurances of "unaligned" to see how this is done,
|
|
(use $ifdef FPC_REQUIRES_PROPER_ALIGNMENT).
|
|
|
|
for more information, visit:
|
|
|
|
http://www.aleph1.co.uk/oldsite/armlinux/book/afaq.html
|
|
}
|
|
|
|
const
|
|
rtINT = 0;
|
|
rtINT64 = 1;
|
|
rtFLOAT = 2;
|
|
|
|
type
|
|
Trint = array[1..4] of dword;
|
|
Trfloat = array[1..4] of double;
|
|
|
|
{$goto on}
|
|
{ define labels }
|
|
label
|
|
stack_loop,
|
|
load_regs,
|
|
asmcall_end,
|
|
int_result,
|
|
int64_result,
|
|
float_result;
|
|
|
|
{ call a function from a pointer }
|
|
{ resulttype: 0 = int, 1 = int64, 2 = float }
|
|
function armasmcall(rint: Trint; rfloat: Trfloat; proc, stack: pointer; stacksize, resulttype: integer): pointer; assembler; nostackframe;
|
|
asm
|
|
mov r12, r13
|
|
stmfd r13!, {r4, r5, r6, r7, r8, r9, r10, r11, r12, r14, r15}
|
|
sub r11, r12, #4
|
|
mov r4, #80 (* space for preserved registers and parameters *)
|
|
ldr r5, [r11, #4] (* stacksize we need for subroutine *)
|
|
add r4, r4, r5
|
|
sub r13, r13, r4 (* create stack space *)
|
|
|
|
(* store parameters on stack *)
|
|
str r0, [r11, #-44] (* rint *)
|
|
str r1, [r11, #-48] (* rfloat *)
|
|
str r2, [r11, #-52] (* proc *)
|
|
str r3, [r11, #-56] (* stack *)
|
|
ldr r0, [r11, #4]
|
|
str r0, [r11, #-60] (* stacksize *)
|
|
ldr r0, [r11, #8]
|
|
str r0, [r11, #-64] (* resulttype *)
|
|
|
|
(* store params for sub-routine that don't fit into r0-r3 at start of stack *)
|
|
ldr r0, [r11, #-60] (* stacksize *)
|
|
cmp r0, #0
|
|
beq load_regs (* skip if no stack *)
|
|
mov r1, r13 (* this points to the bottom now *)
|
|
ldr r2, [r11, #-56] (* stack pointer *)
|
|
stack_loop:
|
|
ldmia r2!, {r4} (* get stack + update pos *)
|
|
stmia r1!, {r4} (* store stack + update pos *)
|
|
subs r0, r0, #4
|
|
bne stack_loop
|
|
|
|
load_regs:
|
|
(* load general regs *)
|
|
ldr r4, [r11, #-44] (* rint *)
|
|
ldr r0, [r4]
|
|
ldr r1, [r4, #4]
|
|
ldr r2, [r4, #8]
|
|
ldr r3, [r4, #12]
|
|
|
|
{$ifdef FPUFPA}
|
|
(* load float regs *)
|
|
ldr r4, [r11, #-48] (* rfloat *)
|
|
ldfd f0, [r4]
|
|
ldfd f1, [r4, #8]
|
|
ldfd f2, [r4, #16]
|
|
ldfd f3, [r4, #24]
|
|
{$endif}
|
|
|
|
(* branch to the proc pointer *)
|
|
ldr r4, [r11, #-52]
|
|
mov r14, r15
|
|
mov r15, r4
|
|
(* blx r4 *)
|
|
|
|
ldr r4, [r11, #-64] (* get resulttype *)
|
|
cmp r4, #1
|
|
blt int_result
|
|
beq int64_result
|
|
bgt float_result
|
|
|
|
int_result:
|
|
str r0, [r11, #-72]
|
|
b asmcall_end
|
|
|
|
int64_result:
|
|
str r0, [r11, #-72]
|
|
str r1, [r11, #-68]
|
|
b asmcall_end
|
|
|
|
float_result:
|
|
{$ifdef FPUFPA}
|
|
stfd f0, [r11, #-72]
|
|
{$else}
|
|
b int64_result
|
|
{$endif}
|
|
b asmcall_end
|
|
|
|
asmcall_end:
|
|
sub r0, r11, #72 (* return pointer to result on stack *)
|
|
|
|
ldmea r11,{r4,r5,r6,r7,r8,r9,r10,r11,r13,r15}
|
|
end;
|
|
|
|
function TPSExec.InnerfuseCall(_Self, Address: Pointer; CallingConv: TPSCallingConvention; Params: TPSList; res: PPSVariantIFC): Boolean;
|
|
var
|
|
rint: Trint; { registers r0 to r3 }
|
|
rfloat: Trfloat; { registers f0 to f3 }
|
|
st: packed array of byte; { stack }
|
|
i, j, rindex, findex, stindex: integer;
|
|
fvar: PPSVariantIFC;
|
|
IsConstructor: Boolean;
|
|
|
|
{ add a dword to stack }
|
|
procedure addstackdword(value: dword);
|
|
begin
|
|
setlength(st, stindex+4);
|
|
pdword(@st[stindex])^ := value;
|
|
inc(stindex, 4);
|
|
end;
|
|
|
|
{ add a float to stack }
|
|
procedure addstackfloat(value: pointer; size: integer);
|
|
begin
|
|
setlength(st, stindex + (size * 4));
|
|
if size = 1
|
|
then psingle(@st[stindex])^ := single(value^)
|
|
else pdouble(@st[stindex])^ := double(value^);
|
|
inc(stindex, size*4);
|
|
end;
|
|
|
|
{ add to the general registers or overflow to stack }
|
|
procedure addgen(value: dword);
|
|
begin
|
|
if rindex <= 4
|
|
then begin
|
|
rint[rindex] := value;
|
|
inc(rindex);
|
|
end
|
|
else begin
|
|
addstackdword(value);
|
|
end;
|
|
end;
|
|
{ add to the float registers or overflow to stack }
|
|
{ size = 1 for single, 2 for double }
|
|
procedure addfloat(value: pointer; size: integer);
|
|
begin
|
|
if findex <= 4
|
|
then begin
|
|
if size = 1
|
|
then rfloat[findex] := single(value^)
|
|
else rfloat[findex] := double(value^);
|
|
inc(findex);
|
|
end
|
|
else begin
|
|
addstackfloat(value, size);
|
|
end;
|
|
end;
|
|
|
|
begin
|
|
if (Integer(CallingConv) and 64) <> 0 then begin
|
|
IsConstructor := true;
|
|
CAllingConv := TPSCallingConvention(Integer(CallingConv) and not 64);
|
|
end else IsConstructor := false;
|
|
|
|
rindex := 1;
|
|
findex := 1;
|
|
stindex := 0;
|
|
setlength(st, stindex);
|
|
Result := False;
|
|
|
|
{ the pointer of the result needs to be passed first in the case of some result types }
|
|
if assigned(res)
|
|
then begin
|
|
case res.atype.basetype of
|
|
btStaticArray, btRecord: addgen(dword(res.dta));
|
|
end;
|
|
end;
|
|
|
|
{ process all parameters }
|
|
for i := 0 to Params.Count-1 do begin
|
|
if Params[i] = nil
|
|
then Exit;
|
|
fvar := Params[i];
|
|
|
|
{ cook dynamic arrays - fpc stores size-1 at @array-4 }
|
|
if (fvar.aType.BaseType = btArray)
|
|
then dec(pdword(pointer(fvar.dta^)-4)^);
|
|
|
|
if fvar.varparam
|
|
then begin { var param }
|
|
case fvar.aType.BaseType of
|
|
{ add var params here }
|
|
btArray, btVariant, btSet, btStaticArray, btRecord, btInterface, btClass, {$IFNDEF PS_NOWIDESTRING} btUnicodeString, btWideString, btWideChar, {$ENDIF}
|
|
btU8, btS8, btU16, btS16, btU32, btS32, btSingle, btDouble, btExtended, btString, btPChar, btChar, btCurrency
|
|
{$IFNDEF PS_NOINT64}, bts64{$ENDIF}: addgen(dword(fvar.dta));
|
|
else begin
|
|
writeln(stderr, 'Parameter type not recognised!');
|
|
Exit;
|
|
end;
|
|
end; { case }
|
|
end else begin { not a var param }
|
|
case fvar.aType.BaseType of
|
|
// btArray, btVariant, btSet, btStaticArray, btRecord, btInterface, btClass, {$IFNDEF PS_NOWIDESTRING} btWideString, btWideChar, {$ENDIF}
|
|
// btU8, btS8, btU16, btS16, btU32, btS32, btSingle, btDouble, btExtended, btString, btPChar, btChar, btCurrency
|
|
// {$IFNDEF PS_NOINT64}, bts64{$ENDIF}: writeln('normal param');
|
|
|
|
{ add normal params here }
|
|
btString: addgen(dword(pstring(fvar.dta)^));
|
|
btU8, btS8: addgen(dword(pbyte(fvar.dta)^));
|
|
btU16, BtS16: addgen(dword(pword(fvar.dta)^));
|
|
btU32, btS32: addgen(dword(pdword(fvar.dta)^));
|
|
btSingle: {$ifdef FPUFPA}
|
|
addfloat(fvar.dta, 1);
|
|
{$else}
|
|
addgen(dword(psingle(fvar.dta)^));
|
|
{$endif}
|
|
btDouble{, btExtended}: {$ifdef FPUFPA}
|
|
addfloat(fvar.dta, 2);
|
|
{$else}
|
|
begin
|
|
addgen(lo(qword(pdouble(fvar.dta)^)));
|
|
addgen(hi(qword(pdouble(fvar.dta)^)));
|
|
end;
|
|
{$endif}
|
|
btPChar: addgen(dword(ppchar(fvar.dta)^));
|
|
btChar: addgen(dword(pchar(fvar.dta)^));
|
|
{$IFNDEF PS_NOINT64}bts64:{$ENDIF} begin
|
|
addgen(dword(pint64(fvar.dta)^ and $ffffffff));
|
|
addgen(dword(pint64(fvar.dta)^ shr 32));
|
|
end;
|
|
btStaticArray: addgen(dword(fvar.dta));
|
|
btRecord: for j := 0 to (fvar.atype.realsize div 4)-1 do
|
|
addgen(pdword(fvar.dta + j*4)^);
|
|
btArray: addstackdword(dword(fvar.dta^)); { this is a bit weird }
|
|
|
|
{ btVariant, btSet, btInterface, btClass }
|
|
|
|
else begin
|
|
writeln(stderr, 'Parameter type not implemented!');
|
|
Exit;
|
|
end;
|
|
end; { case }
|
|
end; { else }
|
|
end; { for }
|
|
|
|
if not assigned(res)
|
|
then begin
|
|
armasmcall(rint, rfloat, address, st, stindex, rtINT); { ignore return }
|
|
end
|
|
else begin
|
|
case res.atype.basetype of
|
|
{ add result types here }
|
|
btString: pstring(res.dta)^ := pstring(armasmcall(rint, rfloat, address, st, stindex, rtINT))^;
|
|
btU8, btS8: pbyte(res.dta)^ := byte(pdword(armasmcall(rint, rfloat, address, st, stindex, rtINT))^);
|
|
btU16, btS16: pword(res.dta)^ := word(pdword(armasmcall(rint, rfloat, address, st, stindex, rtINT))^);
|
|
btU32, btS32: pdword(res.dta)^ := pdword(armasmcall(rint, rfloat, address, st, stindex, rtINT))^;
|
|
btSingle: psingle(res.dta)^ := pdouble(armasmcall(rint, rfloat, address, st, stindex, rtFLOAT))^;
|
|
btDouble{, btExtended}: pdouble(res.dta)^ := pdouble(armasmcall(rint, rfloat, address, st, stindex, rtFLOAT))^;
|
|
btPChar: ppchar(res.dta)^ := pchar(pdword(armasmcall(rint, rfloat, address, st, stindex, rtINT))^);
|
|
btChar: pchar(res.dta)^ := char(pdword(armasmcall(rint, rfloat, address, st, stindex, rtINT))^);
|
|
btStaticArray, btRecord: armasmcall(rint, rfloat, address, st, stindex, rtINT);
|
|
btArray: res.dta := armasmcall(rint, rfloat, address, st, stindex, rtINT);
|
|
|
|
else begin
|
|
writeln(stderr, 'Result type not implemented!');
|
|
exit;
|
|
end; { else }
|
|
end; { case }
|
|
end;
|
|
|
|
{ cook dynamic arrays - fpc stores size-1 at @array-4 }
|
|
for i := 0 to Params.Count-1 do begin
|
|
fvar := Params[i];
|
|
if (fvar.aType.BaseType = btArray)
|
|
then inc(pdword(pointer(fvar.dta^)-4)^);
|
|
end;
|
|
|
|
Result := True;
|
|
end;
|