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|
{
Copyright (c) 1998-2002 by Florian Klaempfl
This unit implements an asmoutput class for the Nasm assembler with
Intel syntax for the i386+
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
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. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
****************************************************************************
}
unit ag386nsm;
{$i fpcdefs.inc}
interface
uses
cpubase,
aasmbase,aasmtai,aasmcpu,assemble,cgutils;
type
T386NasmAssembler = class(texternalassembler)
private
procedure WriteReference(var ref : treference);
procedure WriteOper(const o:toper;s : topsize; opcode: tasmop;ops:longint;dest : boolean);
procedure WriteOper_jmp(const o:toper; op : tasmop);
procedure WriteSection(atype:tasmsectiontype;const aname:string);
public
procedure WriteTree(p:taasmoutput);override;
procedure WriteAsmList;override;
procedure WriteExternals;
end;
implementation
uses
cutils,globtype,globals,systems,cclasses,
fmodule,finput,verbose,cpuinfo,cgbase
;
const
line_length = 64;
nasm_regname_table : array[tregisterindex] of string[7] = (
{r386nasm.inc contains the Nasm name of each register.}
{$i r386nasm.inc}
);
var
lastfileinfo : tfileposinfo;
infile,
lastinfile : tinputfile;
function nasm_regname(r:Tregister):string;
var
p : tregisterindex;
begin
p:=findreg_by_number(r);
if p<>0 then
result:=nasm_regname_table[p]
else
result:=generic_regname(r);
end;
function fixline(s:string):string;
{
return s with all leading and ending spaces and tabs removed
}
var
i,j,k : longint;
begin
i:=length(s);
while (i>0) and (s[i] in [#9,' ']) do
dec(i);
j:=1;
while (j<i) and (s[j] in [#9,' ']) do
inc(j);
for k:=j to i do
if s[k] in [#0..#31,#127..#255] then
s[k]:='.';
fixline:=Copy(s,j,i-j+1);
end;
function single2str(d : single) : string;
var
hs : string;
p : byte;
begin
str(d,hs);
{ nasm expects a lowercase e }
p:=pos('E',hs);
if p>0 then
hs[p]:='e';
p:=pos('+',hs);
if p>0 then
delete(hs,p,1);
single2str:=lower(hs);
end;
function double2str(d : double) : string;
var
hs : string;
p : byte;
begin
str(d,hs);
{ nasm expects a lowercase e }
p:=pos('E',hs);
if p>0 then
hs[p]:='e';
p:=pos('+',hs);
if p>0 then
delete(hs,p,1);
double2str:=lower(hs);
end;
function extended2str(e : extended) : string;
var
hs : string;
p : byte;
begin
str(e,hs);
{ nasm expects a lowercase e }
p:=pos('E',hs);
if p>0 then
hs[p]:='e';
p:=pos('+',hs);
if p>0 then
delete(hs,p,1);
extended2str:=lower(hs);
end;
function comp2str(d : bestreal) : string;
type
pdouble = ^double;
var
c : comp;
dd : pdouble;
begin
{$ifdef FPC}
c:=comp(d);
{$else}
c:=d;
{$endif}
dd:=pdouble(@c); { this makes a bitwise copy of c into a double }
comp2str:=double2str(dd^);
end;
function sizestr(s:topsize;dest:boolean):string;
begin
case s of
S_B : sizestr:='byte ';
S_W : sizestr:='word ';
S_L : sizestr:='dword ';
S_IS : sizestr:='word ';
S_IL : sizestr:='dword ';
S_IQ : sizestr:='qword ';
S_FS : sizestr:='dword ';
S_FL : sizestr:='qword ';
S_FX : sizestr:='tword ';
S_BW : if dest then
sizestr:='word '
else
sizestr:='byte ';
S_BL : if dest then
sizestr:='dword '
else
sizestr:='byte ';
S_WL : if dest then
sizestr:='dword '
else
sizestr:='word ';
else { S_NO }
sizestr:='';
end;
end;
Function PadTabs(const p:string;addch:char):string;
var
s : string;
i : longint;
begin
i:=length(p);
if addch<>#0 then
begin
inc(i);
s:=p+addch;
end
else
s:=p;
if i<8 then
PadTabs:=s+#9#9
else
PadTabs:=s+#9;
end;
{****************************************************************************
T386NasmAssembler
****************************************************************************}
procedure T386NasmAssembler.WriteReference(var ref : treference);
var
first : boolean;
begin
with ref do
begin
AsmWrite('[');
first:=true;
if (segment<>NR_NO) then
AsmWrite(nasm_regname(segment)+':');
if assigned(symbol) then
begin
AsmWrite(symbol.name);
first:=false;
end;
if (base<>NR_NO) then
begin
if not(first) then
AsmWrite('+')
else
first:=false;
AsmWrite(nasm_regname(base))
end;
if (index<>NR_NO) then
begin
if not(first) then
AsmWrite('+')
else
first:=false;
AsmWrite(nasm_regname(index));
if scalefactor<>0 then
AsmWrite('*'+tostr(scalefactor));
end;
if offset<0 then
begin
AsmWrite(tostr(offset));
first:=false;
end
else if (offset>0) then
begin
AsmWrite('+'+tostr(offset));
first:=false;
end;
if first then
AsmWrite('0');
AsmWrite(']');
end;
end;
procedure T386NasmAssembler.WriteOper(const o:toper;s : topsize; opcode: tasmop;ops:longint;dest : boolean);
begin
case o.typ of
top_reg :
AsmWrite(nasm_regname(o.reg));
top_const :
begin
if (ops=1) and (opcode<>A_RET) then
AsmWrite(sizestr(s,dest));
AsmWrite(tostr(longint(o.val)));
end;
top_ref :
begin
if o.ref^.refaddr=addr_no then
begin
if not ((opcode = A_LEA) or (opcode = A_LGS) or
(opcode = A_LSS) or (opcode = A_LFS) or
(opcode = A_LES) or (opcode = A_LDS) or
(opcode = A_SHR) or (opcode = A_SHL) or
(opcode = A_SAR) or (opcode = A_SAL) or
(opcode = A_OUT) or (opcode = A_IN)) then
AsmWrite(sizestr(s,dest));
WriteReference(o.ref^);
end
else
begin
asmwrite('dword ');
if assigned(o.ref^.symbol) then
begin
asmwrite(o.ref^.symbol.name);
if o.ref^.offset=0 then
exit;
end;
if o.ref^.offset>0 then
asmwrite('+');
asmwrite(tostr(o.ref^.offset));
end;
end;
else
internalerror(10001);
end;
end;
procedure T386NasmAssembler.WriteOper_jmp(const o:toper; op : tasmop);
begin
case o.typ of
top_reg :
AsmWrite(nasm_regname(o.reg));
top_ref :
if o.ref^.refaddr=addr_no then
WriteReference(o.ref^)
else
begin
if not(
(op=A_JCXZ) or (op=A_JECXZ) or
(op=A_LOOP) or (op=A_LOOPE) or
(op=A_LOOPNE) or (op=A_LOOPNZ) or
(op=A_LOOPZ)
) then
AsmWrite('NEAR ');
AsmWrite(o.ref^.symbol.name);
if o.ref^.offset>0 then
AsmWrite('+'+tostr(o.ref^.offset))
else
if o.ref^.offset<0 then
AsmWrite(tostr(o.ref^.offset));
end;
top_const :
AsmWrite(tostr(aint(o.val)));
else
internalerror(10001);
end;
end;
var
LastSecType : TAsmSectionType;
const
ait_const2str : array[ait_const_128bit..ait_const_indirect_symbol] of string[20]=(
#9'FIXME128',#9'FIXME64',#9'DD'#9,#9'DW'#9,#9'DB'#9,
#9'FIXMESLEB',#9'FIXEMEULEB',
#9'RVA'#9,#9'FIXMEINDIRECT'#9
);
procedure T386NasmAssembler.WriteSection(atype:tasmsectiontype;const aname:string);
const
secnames : array[tasmsectiontype] of string[12] = ('',
'.text','.data','.rodata','.bss',
'common',
'.note',
'.stab','.stabstr',
'.idata2','.idata4','.idata5','.idata6','.idata7','.edata',
'.eh_frame',
'.debug_frame'
);
begin
AsmLn;
AsmWrite('SECTION ');
AsmWrite(secnames[atype]);
if use_smartlink_section and
(atype<>sec_bss) and
(aname<>'') then
begin
AsmWrite('.');
AsmWrite(aname);
end;
AsmLn;
LasTSecType:=atype;
end;
procedure T386NasmAssembler.WriteTree(p:taasmoutput);
const
regallocstr : array[tregalloctype] of string[10]=(' released',' allocated',' sync',' resized');
tempallocstr : array[boolean] of string[10]=(' released',' allocated');
var
s : string;
hp : tai;
hp1 : tailineinfo;
counter,
lines,
i,j,l : longint;
InlineLevel : longint;
consttyp : taitype;
found,
do_line,
quoted : boolean;
begin
if not assigned(p) then
exit;
InlineLevel:=0;
{ lineinfo is only needed for codesegment (PFV) }
do_line:=(cs_asm_source in aktglobalswitches) or
((cs_lineinfo in aktmoduleswitches)
and (p=codesegment));
hp:=tai(p.first);
while assigned(hp) do
begin
if not(hp.typ in SkipLineInfo) then
begin
hp1:=hp as tailineinfo;
aktfilepos:=hp1.fileinfo;
if do_line then
begin
{ load infile }
if lastfileinfo.fileindex<>hp1.fileinfo.fileindex then
begin
infile:=current_module.sourcefiles.get_file(hp1.fileinfo.fileindex);
if assigned(infile) then
begin
{ open only if needed !! }
if (cs_asm_source in aktglobalswitches) then
infile.open;
end;
{ avoid unnecessary reopens of the same file !! }
lastfileinfo.fileindex:=hp1.fileinfo.fileindex;
{ be sure to change line !! }
lastfileinfo.line:=-1;
end;
{ write source }
if (cs_asm_source in aktglobalswitches) and
assigned(infile) then
begin
if (infile<>lastinfile) then
begin
AsmWriteLn(target_asm.comment+'['+infile.name^+']');
if assigned(lastinfile) then
lastinfile.close;
end;
if (hp1.fileinfo.line<>lastfileinfo.line) and
((hp1.fileinfo.line<infile.maxlinebuf) or (InlineLevel>0)) then
begin
if (hp1.fileinfo.line<>0) and
((infile.linebuf^[hp1.fileinfo.line]>=0) or (InlineLevel>0)) then
AsmWriteLn(target_asm.comment+'['+tostr(hp1.fileinfo.line)+'] '+
fixline(infile.GetLineStr(hp1.fileinfo.line)));
{ set it to a negative value !
to make that is has been read already !! PM }
if (infile.linebuf^[hp1.fileinfo.line]>=0) then
infile.linebuf^[hp1.fileinfo.line]:=-infile.linebuf^[hp1.fileinfo.line]-1;
end;
end;
lastfileinfo:=hp1.fileinfo;
lastinfile:=infile;
end;
end;
case hp.typ of
ait_comment :
Begin
AsmWrite(target_asm.comment);
AsmWritePChar(tai_comment(hp).str);
AsmLn;
End;
ait_regalloc :
begin
if (cs_asm_regalloc in aktglobalswitches) then
AsmWriteLn(#9#9+target_asm.comment+'Register '+nasm_regname(tai_regalloc(hp).reg)+
regallocstr[tai_regalloc(hp).ratype]);
end;
ait_tempalloc :
begin
if (cs_asm_tempalloc in aktglobalswitches) then
begin
{$ifdef EXTDEBUG}
if assigned(tai_tempalloc(hp).problem) then
AsmWriteLn(target_asm.comment+tai_tempalloc(hp).problem^+' ('+tostr(tai_tempalloc(hp).temppos)+','+
tostr(tai_tempalloc(hp).tempsize)+')')
else
{$endif EXTDEBUG}
AsmWriteLn(target_asm.comment+'Temp '+tostr(tai_tempalloc(hp).temppos)+','+
tostr(tai_tempalloc(hp).tempsize)+tempallocstr[tai_tempalloc(hp).allocation]);
end;
end;
ait_section :
begin
if tai_section(hp).sectype<>sec_none then
WriteSection(tai_section(hp).sectype,tai_section(hp).name^);
LasTSecType:=tai_section(hp).sectype;
end;
ait_align :
begin
{ nasm gives warnings when it finds align in bss as it
wants to store data }
if (lastsectype<>sec_bss) and
(tai_align(hp).aligntype>1) then
AsmWriteLn(#9'ALIGN '+tostr(tai_align(hp).aligntype));
end;
ait_datablock :
begin
if tai_datablock(hp).is_global then
begin
AsmWrite(#9'GLOBAL ');
AsmWriteLn(tai_datablock(hp).sym.name);
end;
AsmWrite(PadTabs(tai_datablock(hp).sym.name,':'));
AsmWriteLn('RESB'#9+tostr(tai_datablock(hp).size));
end;
ait_const_uleb128bit,
ait_const_sleb128bit,
ait_const_128bit,
ait_const_64bit,
ait_const_32bit,
ait_const_16bit,
ait_const_8bit,
ait_const_rva_symbol,
ait_const_indirect_symbol :
begin
AsmWrite(ait_const2str[hp.typ]);
consttyp:=hp.typ;
l:=0;
repeat
if assigned(tai_const(hp).sym) then
begin
if assigned(tai_const(hp).endsym) then
s:=tai_const(hp).endsym.name+'-'+tai_const(hp).sym.name
else
s:=tai_const(hp).sym.name;
if tai_const(hp).value<>0 then
s:=s+tostr_with_plus(tai_const(hp).value);
end
else
s:=tostr(tai_const(hp).value);
AsmWrite(s);
inc(l,length(s));
if (l>line_length) or
(hp.next=nil) or
(tai(hp.next).typ<>consttyp) then
break;
hp:=tai(hp.next);
AsmWrite(',');
until false;
AsmLn;
end;
ait_real_32bit :
AsmWriteLn(#9#9'DD'#9+single2str(tai_real_32bit(hp).value));
ait_real_64bit :
AsmWriteLn(#9#9'DQ'#9+double2str(tai_real_64bit(hp).value));
ait_real_80bit :
AsmWriteLn(#9#9'DT'#9+extended2str(tai_real_80bit(hp).value));
ait_comp_64bit :
AsmWriteLn(#9#9'DQ'#9+comp2str(tai_real_80bit(hp).value));
ait_string :
begin
counter := 0;
lines := tai_string(hp).len div line_length;
{ separate lines in different parts }
if tai_string(hp).len > 0 then
Begin
for j := 0 to lines-1 do
begin
AsmWrite(#9#9'DB'#9);
quoted:=false;
for i:=counter to counter+line_length-1 do
begin
{ it is an ascii character. }
if (ord(tai_string(hp).str[i])>31) and
(ord(tai_string(hp).str[i])<128) and
(tai_string(hp).str[i]<>'"') then
begin
if not(quoted) then
begin
if i>counter then
AsmWrite(',');
AsmWrite('"');
end;
AsmWrite(tai_string(hp).str[i]);
quoted:=true;
end { if > 31 and < 128 and ord('"') }
else
begin
if quoted then
AsmWrite('"');
if i>counter then
AsmWrite(',');
quoted:=false;
AsmWrite(tostr(ord(tai_string(hp).str[i])));
end;
end; { end for i:=0 to... }
if quoted then AsmWrite('"');
AsmWrite(target_info.newline);
inc(counter,line_length);
end; { end for j:=0 ... }
{ do last line of lines }
if counter<tai_string(hp).len then
AsmWrite(#9#9'DB'#9);
quoted:=false;
for i:=counter to tai_string(hp).len-1 do
begin
{ it is an ascii character. }
if (ord(tai_string(hp).str[i])>31) and
(ord(tai_string(hp).str[i])<128) and
(tai_string(hp).str[i]<>'"') then
begin
if not(quoted) then
begin
if i>counter then
AsmWrite(',');
AsmWrite('"');
end;
AsmWrite(tai_string(hp).str[i]);
quoted:=true;
end { if > 31 and < 128 and " }
else
begin
if quoted then
AsmWrite('"');
if i>counter then
AsmWrite(',');
quoted:=false;
AsmWrite(tostr(ord(tai_string(hp).str[i])));
end;
end; { end for i:=0 to... }
if quoted then
AsmWrite('"');
end;
AsmLn;
end;
ait_label :
begin
if tai_label(hp).l.is_used then
AsmWriteLn(tai_label(hp).l.name+':');
end;
ait_direct :
begin
AsmWritePChar(tai_direct(hp).str);
AsmLn;
end;
ait_symbol :
begin
if tai_symbol(hp).is_global then
begin
AsmWrite(#9'GLOBAL ');
AsmWriteLn(tai_symbol(hp).sym.name);
end;
AsmWrite(tai_symbol(hp).sym.name);
if assigned(hp.next) and not(tai(hp.next).typ in
[ait_const_32bit,ait_const_16bit,ait_const_8bit,
ait_const_rva_symbol,
ait_real_32bit,ait_real_64bit,ait_real_80bit,ait_comp_64bit,ait_string]) then
AsmWriteLn(':')
end;
ait_symbol_end : ;
ait_instruction :
begin
taicpu(hp).CheckNonCommutativeOpcodes;
{ We need intel order, no At&t }
taicpu(hp).SetOperandOrder(op_intel);
s:='';
if ((taicpu(hp).opcode=A_FADDP) or
(taicpu(hp).opcode=A_FMULP))
and (taicpu(hp).ops=0) then
begin
taicpu(hp).allocate_oper(2);
taicpu(hp).oper[0]^.typ:=top_reg;
taicpu(hp).oper[0]^.reg:=NR_ST1;
taicpu(hp).oper[1]^.typ:=top_reg;
taicpu(hp).oper[1]^.reg:=NR_ST;
end;
if taicpu(hp).opcode=A_FWAIT then
AsmWriteln(#9#9'DB'#9'09bh')
else
begin
{ We need to explicitely set
word prefix to get selectors
to be pushed in 2 bytes PM }
if (taicpu(hp).opsize=S_W) and
((taicpu(hp).opcode=A_PUSH) or
(taicpu(hp).opcode=A_POP)) and
(taicpu(hp).oper[0]^.typ=top_reg) and
(is_segment_reg(taicpu(hp).oper[0]^.reg)) then
AsmWriteln(#9#9'DB'#9'066h');
AsmWrite(#9#9+std_op2str[taicpu(hp).opcode]+cond2str[taicpu(hp).condition]);
if taicpu(hp).ops<>0 then
begin
if is_calljmp(taicpu(hp).opcode) then
begin
AsmWrite(#9);
WriteOper_jmp(taicpu(hp).oper[0]^,taicpu(hp).opcode);
end
else
begin
for i:=0 to taicpu(hp).ops-1 do
begin
if i=0 then
AsmWrite(#9)
else
AsmWrite(',');
WriteOper(taicpu(hp).oper[i]^,taicpu(hp).opsize,taicpu(hp).opcode,taicpu(hp).ops,(i=2));
end;
end;
end;
AsmLn;
end;
end;
{$ifdef GDB}
ait_stabn,
ait_stabs,
ait_force_line,
ait_stab_function_name : ;
{$endif GDB}
ait_cutobject :
begin
{ only reset buffer if nothing has changed }
if AsmSize=AsmStartSize then
AsmClear
else
begin
AsmClose;
DoAssemble;
AsmCreate(tai_cutobject(hp).place);
end;
{ avoid empty files }
while assigned(hp.next) and (tai(hp.next).typ in [ait_cutobject,ait_section,ait_comment]) do
begin
if tai(hp.next).typ=ait_section then
lasTSectype:=tai_section(hp.next).sectype;
hp:=tai(hp.next);
end;
if lasTSectype<>sec_none then
WriteSection(tai_section(hp).sectype,tai_section(hp).name^);
AsmStartSize:=AsmSize;
end;
ait_marker :
if tai_marker(hp).kind=InlineStart then
inc(InlineLevel)
else if tai_marker(hp).kind=InlineEnd then
dec(InlineLevel);
else
internalerror(10000);
end;
hp:=tai(hp.next);
end;
end;
var
currentasmlist : TExternalAssembler;
procedure writeexternal(p:tnamedindexitem;arg:pointer);
begin
if tasmsymbol(p).defbind=AB_EXTERNAL then
currentasmlist.AsmWriteln('EXTERN'#9+p.name);
end;
procedure T386NasmAssembler.WriteExternals;
begin
currentasmlist:=self;
objectlibrary.symbolsearch.foreach_static(@writeexternal,nil);
end;
procedure T386NasmAssembler.WriteAsmList;
begin
{$ifdef EXTDEBUG}
if assigned(current_module.mainsource) then
comment(v_info,'Start writing nasm-styled assembler output for '+current_module.mainsource^);
{$endif}
LasTSecType:=sec_none;
AsmWriteLn('BITS 32');
AsmLn;
lastfileinfo.line:=-1;
lastfileinfo.fileindex:=0;
lastinfile:=nil;
WriteExternals;
{ Nasm doesn't support stabs
WriteTree(debuglist);}
WriteTree(codesegment);
WriteTree(datasegment);
WriteTree(consts);
WriteTree(rttilist);
WriteTree(resourcestringlist);
WriteTree(bsssegment);
Writetree(importssection);
{ exports are written by DLLTOOL
if we use it so don't insert it twice (PM) }
if not UseDeffileForExports and assigned(exportssection) then
Writetree(exportssection);
Writetree(resourcesection);
AsmLn;
{$ifdef EXTDEBUG}
if assigned(current_module.mainsource) then
comment(v_info,'Done writing nasm-styled assembler output for '+current_module.mainsource^);
{$endif EXTDEBUG}
end;
{*****************************************************************************
Initialize
*****************************************************************************}
const
as_i386_nasmcoff_info : tasminfo =
(
id : as_i386_nasmcoff;
idtxt : 'NASMCOFF';
asmbin : 'nasm';
asmcmd : '-f coff -o $OBJ $ASM';
supported_target : system_i386_go32v2;
flags : [af_allowdirect,af_needar];
labelprefix : '..@';
comment : '; ';
);
as_i386_nasmwin32_info : tasminfo =
(
id : as_i386_nasmwin32;
idtxt : 'NASMWIN32';
asmbin : 'nasm';
asmcmd : '-f win32 -o $OBJ $ASM';
supported_target : system_i386_win32;
flags : [af_allowdirect,af_needar];
labelprefix : '..@';
comment : '; ';
);
as_i386_nasmobj_info : tasminfo =
(
id : as_i386_nasmobj;
idtxt : 'NASMOBJ';
asmbin : 'nasm';
asmcmd : '-f obj -o $OBJ $ASM';
supported_target : system_any; { what should I write here ?? }
flags : [af_allowdirect,af_needar];
labelprefix : '..@';
comment : '; ';
);
as_i386_nasmwdosx_info : tasminfo =
(
id : as_i386_nasmwdosx;
idtxt : 'NASMWDOSX';
asmbin : 'nasm';
asmcmd : '-f win32 -o $OBJ $ASM';
supported_target : system_i386_wdosx;
flags : [af_allowdirect,af_needar];
labelprefix : '..@';
comment : '; ';
);
as_i386_nasmelf_info : tasminfo =
(
id : as_i386_nasmelf;
idtxt : 'NASMELF';
asmbin : 'nasm';
asmcmd : '-f elf -o $OBJ $ASM';
supported_target : system_i386_linux;
flags : [af_allowdirect,af_needar];
labelprefix : '..@';
comment : '; ';
);
as_i386_nasmbeos_info : tasminfo =
(
id : as_i386_nasmbeos;
idtxt : 'NASMELF';
asmbin : 'nasm';
asmcmd : '-f elf -o $OBJ $ASM';
supported_target : system_i386_beos;
flags : [af_allowdirect,af_needar];
labelprefix : '..@';
comment : '; ';
);
initialization
RegisterAssembler(as_i386_nasmcoff_info,T386NasmAssembler);
RegisterAssembler(as_i386_nasmwin32_info,T386NasmAssembler);
RegisterAssembler(as_i386_nasmwdosx_info,T386NasmAssembler);
RegisterAssembler(as_i386_nasmobj_info,T386NasmAssembler);
RegisterAssembler(as_i386_nasmbeos_info,T386NasmAssembler);
RegisterAssembler(as_i386_nasmelf_info,T386NasmAssembler);
end.
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