267 lines
4 KiB
C
267 lines
4 KiB
C
/* $Header: mach5.c, v1.6 3-Nov-88 AJM */
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branch(brtyp, link, val)
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word_t brtyp;
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word_t link;
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valu_t val;
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{
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valu_t offset;
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offset = val - DOTVAL - 8;
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if ((offset & 0xFC000000) != 0 && (offset & 0xFC000000) != 0xFC000000){
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serror("offset out of range");
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}
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offset = offset>>2 & 0xFFFFFF;
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emit4(brtyp|link|offset);
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return;
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}
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data(opc, ins, val, typ)
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long opc, ins;
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valu_t val;
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short typ;
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{
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valu_t tmpval;
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if (typ == S_REG){
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emit4(opc|ins|val);
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return;
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}
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ins |= 0x02000000;
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tmpval = val;
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if (typ == S_ABS){
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if (calcimm(&opc, &tmpval, typ)){
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emit4(opc|ins|tmpval);
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return;
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}
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}
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tmpval = val;
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if (small(calcimm(&opc, &tmpval, typ),12)){
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emit4(opc|ins|tmpval);
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return;
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}
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if (opc == MOV && typ != S_ABS)
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{
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if (small((val & 0xF0000000) == 0xF0000000, 8)){
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emit4(0xE51F0004 | (ins & 0xF000));
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emit4(val);
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return;
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}
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if (small(1,4)){
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emit4(0xE51F0000 | (ins & 0xF000));
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emit4(0xEA000000);
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emit4(val);
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return;
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}
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DOTVAL += 16;
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return;
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}
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if (opc == ADD && typ != S_ABS)
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{
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if (small((val & 0xF0000000) == 0xF0000000, 4)){
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emit4(0xE51F0004 | (ins & 0xF000));
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emit4(val);
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emit4(0xE2800000 | (ins&0xFF000) | (ins&0xF000)>>12);
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return;
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}
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emit4(0xE51F0000 | (ins & 0xF000));
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emit4(0xEA000000);
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emit4(val);
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emit4(0xE2800000 | (ins&0xFF000) | (ins&0xF000)>>12);
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return;
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}
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/* default: */
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if (pass == PASS_1)
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DOTVAL += 16;
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else
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serror("immediate value out of range");
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return;
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}
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calcimm(opc,val,typ)
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word_t *opc;
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valu_t *val;
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short typ;
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{
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int i = 0;
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if (typ == S_UND) return 0;
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if ((*val & 0xFFFFFF00) == 0) return 1;
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if ((~*val & 0xFFFFFF00) == 0){
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if (*opc == AND)
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{
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*val = ~*val;
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*opc = BIC;
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return 1;
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}
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if (*opc == MOV)
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{
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*val = ~*val;
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*opc = MVN;
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return 1;
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}
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if (*opc == ADC)
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{
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*val = ~*val;
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*opc = SBC;
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return 1;
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}
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}
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if ((-1**val & 0xFFFFFF00) == 0 ){
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if (*opc == ADD)
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{
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*val *= -1;
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*opc = SUB;
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return 1;
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}
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if (*opc == CMP)
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{
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*val *= -1;
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*opc = CMN;
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return 1;
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}
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}
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do{
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rotateleft2(&*val);
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i++;
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if((*val & 0xFFFFFF00) == 0){
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*val = *val|i<<8;
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return 1;
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}
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if ((~*val & 0xFFFFFF00) == 0){
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if (*opc == AND)
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{
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*val = ~*val|i<<8;
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*opc = BIC;
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return 1;
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}
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if (*opc == MOV)
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{
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*val = ~*val|i<<8;
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*opc = MVN;
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return 1;
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}
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if (*opc == ADC)
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{
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*val = ~*val|i<<8;
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*opc = SBC;
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return 1;
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}
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}
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}while(i<15);
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return 0;
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}
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word_t
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calcoffset(val)
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valu_t val;
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{
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if((val & 0xFFFFF000) == 0)
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return(val|0x00800000);
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val *= -1;
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if((val & 0xFFFFF000) == 0)
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return(val);
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serror("offset out of range");
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return(0);
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}
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word_t
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calcaddress (val,typ,reg)
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valu_t val;
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short typ;
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word_t reg;
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{
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int tmpval;
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if (typ == S_UND){
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DOTVAL += 8;
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return 0;
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}
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tmpval = val - DOTVAL - 8;
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if(small((tmpval & 0xFFFFF000) == 0, 8))
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return(val|0x008F0000);
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tmpval *= -1;
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if(small((tmpval & 0xFFFFF000) == 0, 8))
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return(val|0x000F0000);
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emit4(0xE51F0004 | reg << 12);
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emit4(val | 0xF0000000);
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return(reg << 16);
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}
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word_t
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calcadr(ins, reg, val, typ)
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word_t ins, reg;
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valu_t val;
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short typ;
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{
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valu_t tmpval = val;
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word_t opc;
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int i = 0;
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if (typ != S_ABS){
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tmpval = val-DOTVAL-8;
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if (tmpval > 0) {
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if (small((tmpval & 0xFFFFFF00) == 0),12){
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emit4(ins|ADD|0x020F0000|reg<<12|tmpval);
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return 0;
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}
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}
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tmpval *= -1;
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if (small((tmpval & 0xFFFFFF00) == 0), 12){
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emit4(ins|SUB|0x020F0000|reg<<12|tmpval);
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return 0;
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}
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}
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tmpval = val;
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opc = MOV;
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if (calcimm(&opc, &tmpval, typ)){
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emit4(ins|opc|0x020F0000|reg<<12|tmpval);
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return 0;
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}
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/* Failed */
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if (pass == PASS_1)
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DOTVAL += 16;
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else
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serror("illegal ADR argument");
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return ;
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}
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word_t
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calcshft(val, typ, styp)
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valu_t val;
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short typ;
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word_t styp;
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{
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if (typ=S_UND) return 0;
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if (val & 0xFFFFFFE0) serror("shiftcount out of range");
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if (styp && !val) warning("shiftcount 0");
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return((val & 0x1F)<<7);
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}
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rotateleft2(x)
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long *x;
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{
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unsigned long bits;
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bits = *x & 0xC0000000;
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*x <<= 2 ;
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if (bits){
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bits >>= 30;
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*x |= bits;
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}
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return;
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}
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