static void getAsmLine( VBUF *buff )
{
char line[256];
if( endOfAsmStmt() )
return;
/* reserve at least MAX_INSTR_SIZE bytes in the buffer */
VbufReqd( buff, ((AsmCodeAddress+MAX_INSTR_SIZE) + (MAX_INSTR_SIZE-1)) & ~(MAX_INSTR_SIZE-1) );
AsmCodeBuffer = VbufBuffer( buff );
ensureBufferReflectsCurToken();
if( isId( CurToken ) && strcmp( Buffer, "__emit" ) == 0 ) {
strcpy( line, AsmSysDefineByte() );
strcat( line, " " );
NextToken();
ensureBufferReflectsCurToken();
} else {
line[0] = '\0';
}
for(;;) {
if( endOfAsmStmt() ) break;
strncat( line, Buffer, sizeof(line)-1 );
switch( CurToken ) {
case T_ALT_XOR:
case T_ALT_EXCLAMATION:
case T_ALT_AND_AND:
case T_ALT_OR_OR:
strncat( line, " ", sizeof(line)-1 );
break;
default:
if( isId( CurToken ) )
strncat( line, " ", sizeof(line)-1 );
break;
}
NextToken();
ensureBufferReflectsCurToken();
}
if( line[0] != '\0' ) {
AsmLine( line );
}
VbufSetLen( buff, AsmCodeAddress );
if( CurToken == T_SEMI_COLON ) {
// ; .ASM comment
for(;;) {
NextToken();
if( CurToken == T_EOF ) break;
if( CurToken == T_NULL ) break;
}
}
}
static int insertFixups( VBUF *src_code )
{
struct asmfixup *fix;
struct asmfixup *head;
struct asmfixup *chk;
struct asmfixup *next;
struct asmfixup **owner;
unsigned char *src;
unsigned char *src_start;
unsigned char *src_end;
unsigned char cg_fix;
bool perform_fixups;
byte_seq *seq;
SYMBOL sym;
NAME name;
unsigned char *dst;
byte_seq_len len;
unsigned skip;
int mutate_to_segment;
bool uses_auto;
#if _CPU == 8086
int fixup_padding;
#endif
VBUF out_code;
uses_auto = FALSE;
perform_fixups = FALSE;
head = FixupHead;
if( head == NULL ) {
out_code = *src_code;
} else {
VbufInit( &out_code );
FixupHead = NULL;
/* sort the fixup list in increasing fixup_loc's */
for( fix = head; fix != NULL; fix = next ) {
owner = &FixupHead;
for( ;; ) {
chk = *owner;
if( chk == NULL ) break;
if( chk->fixup_loc > fix->fixup_loc ) break;
owner = &chk->next;
}
next = fix->next;
fix->next = *owner;
*owner = fix;
}
len = 0;
cg_fix = 0;
sym = NULL;
src_start = VbufBuffer( src_code );
src_end = src_start + VbufLen( src_code );
fix = FixupHead;
owner = &FixupHead;
/* insert fixup escape sequences */
for( src = src_start; src < src_end; ) {
/* reserve at least ASM_BLOCK bytes in the buffer */
VbufReqd( &out_code, _RoundUp( len + ASM_BLOCK, ASM_BLOCK ) );
dst = VbufBuffer( &out_code );
if( fix != NULL && fix->fixup_loc == (src - src_start) ) {
name = NULL;
if( fix->name != NULL ) {
name = NameCreateNoLen( fix->name );
sym = ScopeASMUseSymbol( name, &uses_auto );
if( sym == NULL ) {
return( 0 );
}
}
/* insert fixup information */
skip = 0;
dst[len++] = FLOATING_FIXUP_BYTE;
mutate_to_segment = 0;
#if _CPU == 8086
fixup_padding = 0;
#endif
switch( fix->fixup_type ) {
case FIX_FPPATCH:
dst[len++] = fix->offset;
break;
case FIX_SEG:
if( name == NULL ) {
// special case for floating point fixup
if( ( src[0] == 0x90 ) && ( src[1] == 0x9B ) ) {
// inline assembler FWAIT instruction 0x90, 0x9b
dst[len++] = FIX_FPP_WAIT;
} else if( src[0] == 0x9b && (src[1] & 0xd8) == 0xd8 ) {
// FWAIT as first byte and FPU instruction opcode as second byte
dst[len++] = FIX_FPP_NORMAL;
} else if( src[0] == 0x9b && (src[2] & 0xd8) == 0xd8 ) {
// FWAIT as first byte and FPU instruction opcode as third byte
// second byte should be segment override prefix
switch( src[1] ) {
case PREFIX_ES: dst[len++] = FIX_FPP_ES; break;
case PREFIX_CS: dst[len++] = FIX_FPP_CS; break;
case PREFIX_SS: dst[len++] = FIX_FPP_SS; break;
case PREFIX_DS: dst[len++] = FIX_FPP_DS; break;
case PREFIX_GS: dst[len++] = FIX_FPP_GS; break;
case PREFIX_FS: dst[len++] = FIX_FPP_FS; break;
default: --len; break; // skip FP patch
}
} else {
// skip FP patch
--len;
}
} else {
skip = 2;
cg_fix = FIX_SYM_SEGMENT;
}
break;
case FIX_RELOFF16:
skip = 2;
cg_fix = FIX_SYM_RELOFF;
break;
case FIX_RELOFF32:
skip = 4;
cg_fix = FIX_SYM_RELOFF;
#if _CPU == 8086
fixup_padding = 1;
#endif
break;
case FIX_PTR16:
mutate_to_segment = 1;
/* fall through */
case FIX_OFF16:
skip = 2;
cg_fix = FIX_SYM_OFFSET;
break;
case FIX_PTR32:
mutate_to_segment = 1;
/* fall through */
case FIX_OFF32:
skip = 4;
cg_fix = FIX_SYM_OFFSET;
#if _CPU == 8086
fixup_padding = 1;
#endif
break;
default:
CErr2p( ERR_ASSEMBLER_ERROR, "cannot reach label" );
break;
}
if( skip != 0 ) {
dst[len++] = cg_fix;
*((BYTE_SEQ_SYM *)&dst[len]) = sym;
len += sizeof( BYTE_SEQ_SYM );
*((BYTE_SEQ_OFF *)&dst[len]) = fix->offset;
len += sizeof( BYTE_SEQ_OFF );
src += skip;
}
#if _CPU == 8086
if( fixup_padding ) {
// add offset fixup padding to 32-bit
// cg create only 16-bit offset fixup
dst[len++] = 0;
dst[len++] = 0;
//
}
#endif
if( mutate_to_segment ) {
/*
Since the CG escape sequences don't allow for
FAR pointer fixups, we have to split them into two.
This is done by doing the offset fixup first, then
mutating the fixup structure to look like a segment
fixup one near pointer size later.
*/
fix->fixup_type = FIX_SEG;
fix->fixup_loc += skip;
fix->offset = 0;
} else {
head = fix;
fix = fix->next;
if( head->external ) {
*owner = fix;
CMemFree( head->name );
CMemFree( head );
} else {
owner = &head->next;
}
}
} else {
if( *src == FLOATING_FIXUP_BYTE ) {
dst[len++] = FLOATING_FIXUP_BYTE;
}
dst[len++] = *src++;
}
VbufSetLen( &out_code, len );
}
perform_fixups = TRUE;
}
len = VbufLen( &out_code );
seq = CMemAlloc( offsetof( byte_seq, data ) + len );
seq->relocs = perform_fixups;
seq->length = len;
memcpy( seq->data, VbufBuffer( &out_code ), len );
CurrInfo->code = seq;
if( VbufBuffer( &out_code ) != VbufBuffer( src_code ) )
VbufFree( &out_code );
return( uses_auto );
}
static int GetByteSeq( void )
{
int len;
char *name;
unsigned offset;
unsigned fixword;
int uses_auto;
VBUF code_buffer;
#if _CPU == 8086
bool use_fpu_emu = FALSE;
#endif
VbufInit( &code_buffer );
AsmSysInit();
PPCTL_ENABLE_MACROS();
NextToken();
len = 0;
offset = 0;
name = NULL;
for( ;; ) {
/* reserve at least ASM_BLOCK bytes in the buffer */
VbufReqd( &code_buffer, _RoundUp( len + ASM_BLOCK, ASM_BLOCK ) );
if( CurToken == T_STRING ) {
AsmCodeAddress = len;
AsmCodeBuffer = VbufBuffer( &code_buffer );
#if _CPU == 8086
AsmLine( Buffer, use_fpu_emu );
use_fpu_emu = FALSE;
#else
AsmLine( Buffer, FALSE );
#endif
len = AsmCodeAddress;
NextToken();
if( CurToken == T_COMMA ) {
NextToken();
}
} else if( CurToken == T_CONSTANT ) {
#if _CPU == 8086
if( use_fpu_emu ) {
AddAFix( len, NULL, FIX_SEG, 0 );
use_fpu_emu = FALSE;
}
#endif
VbufBuffer( &code_buffer )[ len++ ] = U32Fetch( Constant64 );
NextToken();
} else {
#if _CPU == 8086
use_fpu_emu = FALSE;
#endif
fixword = FixupKeyword();
if( fixword == FIXWORD_NONE )
break;
if( fixword == FIXWORD_FLOAT ) {
#if _CPU == 8086
if( GET_FPU_EMU( CpuSwitches ) ) {
use_fpu_emu = TRUE;
}
#endif
} else { /* seg or offset */
if( !IS_ID_OR_KEYWORD( CurToken ) ) {
CErr1( ERR_EXPECTING_ID );
} else {
name = strsave( Buffer );
offset = 0;
NextToken();
if( CurToken == T_PLUS ) {
NextToken();
if( CurToken == T_CONSTANT ) {
offset = U32Fetch( Constant64 );
NextToken();
}
} else if( CurToken == T_MINUS ) {
NextToken();
if( CurToken == T_CONSTANT ) {
offset = - U32Fetch( Constant64 );
NextToken();
}
}
}
switch( fixword ) {
case FIXWORD_RELOFF:
#if _CPU == 8086
AddAFix( len, name, FIX_RELOFF16, offset );
len += 2;
#else
AddAFix( len, name, FIX_RELOFF32, offset );
len += 4;
#endif
break;
case FIXWORD_OFFSET:
#if _CPU == 8086
AddAFix( len, name, FIX_OFF16, offset );
len += 2;
#else
AddAFix( len, name, FIX_OFF32, offset );
len += 4;
#endif
break;
case FIXWORD_SEGMENT:
AddAFix( len, name, FIX_SEG, 0 );
len += 2;
break;
}
}
}
VbufSetLen( &code_buffer, len );
}
PPCTL_DISABLE_MACROS();
uses_auto = AsmSysInsertFixups( &code_buffer );
AsmSysFini();
VbufFree( &code_buffer );
return( uses_auto );
}
