Esempio n. 1
0
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
GLOBAL VOID
RCL
       	    	    	                    
IFN3(
	IU32 *, pop1,	/* pntr to dst/src operand */
	IU32, op2,	/* rotation count operand */
	IUM8, op_sz	/* 8, 16 or 32-bit */
    )


   {
   IU32 result;
   IU32 feedback;	/* Bit posn to feed into carry */
   ISM32 i;
   ISM32 new_of;

   /* only use lower five bits of count */
   if ( (op2 &= 0x1f) == 0 )
      return;

   /*
	    ====     =================
	 -- |CF| <-- | | | | | | | | | <--
	 |  ====     =================   |
	 ---------------------------------
    */
   feedback = SZ2MSB(op_sz);
   for ( result = *pop1, i = 0; i < op2; i++ )
      {
      if ( result & feedback )
	 {
	 result = result << 1 | GET_CF();
	 SET_CF(1);
	 }
      else
	 {
	 result = result << 1 | GET_CF();
	 SET_CF(0);
	 }
      }
   
   /* OF = CF ^ MSB of result */
   new_of = GET_CF() ^ (result & feedback) != 0;

   if ( op2 == 1 )
      {
      SET_OF(new_of);
      }
   else
      {
      do_multiple_shiftrot_of(new_of);
      }

   *pop1 = result;	/* Return answer */
   }
Esempio n. 2
0
GLOBAL VOID
DAA()
   {
   IU8 temp_al;

   temp_al = GET_AL();

   if ( (temp_al & 0xf) > 9 || GET_AF() )
      {
      temp_al += 6;
      SET_AF(1);
      }

   if ( GET_AL() > 0x99 || GET_CF() )
      {
      temp_al += 0x60;
      SET_CF(1);
      }

   SET_AL(temp_al);

   /* set ZF,SF,PF according to result */
   SET_ZF(temp_al == 0);
   SET_SF((temp_al & BIT7_MASK) != 0);
   SET_PF(pf_table[temp_al]);

   /* Set undefined flag(s) */
#ifdef SET_UNDEFINED_FLAG
   SET_OF(UNDEFINED_FLAG);
#endif
   }
Esempio n. 3
0
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
GLOBAL VOID
SBB
       	    	    	                    
IFN3(
	IU32 *, pop1,	/* pntr to dst/lsrc operand */
	IU32, op2,	/* rsrc operand */
	IUM8, op_sz	/* 8, 16 or 32-bit */
    )


   {
   IU32 result;
   IU32 carry;
   IU32 msb;
   IU32 op1_msb;
   IU32 op2_msb;
   IU32 res_msb;

   msb = SZ2MSB(op_sz);
   					/* Do operation */
   result = *pop1 - op2 - GET_CF() & SZ2MASK(op_sz);
   op1_msb = (*pop1  & msb) != 0;	/* Isolate all msb's */
   op2_msb = (op2    & msb) != 0;
   res_msb = (result & msb) != 0;
   carry = *pop1 ^ op2 ^ result;	/* Isolate carries */
					/* Determine flags */
   /*
      OF = (op1 == !op2) & (op1 ^ res)
      ie if operand signs differ and res sign different to original
      destination set OF.
    */
   SET_OF((op1_msb != op2_msb) & (op1_msb ^ res_msb));
   /*
      Formally:-     CF = !op1 & op2 | res & !op1 | res & op2
      Equivalently:- CF = OF ^ op1 ^ op2 ^ res
    */
   SET_CF(((carry & msb) != 0) ^ GET_OF());
   SET_PF(pf_table[result & BYTE_MASK]);
   SET_ZF(result == 0);
   SET_SF((result & msb) != 0);		/* SF = MSB */
   SET_AF((carry & BIT4_MASK) != 0);	/* AF = Bit 4 carry */
   *pop1 = result;			/* Return answer */
   }
Esempio n. 4
0
File: VM.cpp Progetto: preda/pepper
// extern __thread jmp_buf jumpBuf;
int VM::call(Value A, int nEffArgs, Value *regs, Stack *stack) {
    Vector<RetInfo> retInfo; // only used if FAST_CALL

    if (!(IS_O_TYPE(A, O_FUNC) || IS_CF(A) || IS_O_TYPE(A, O_CFUNC))) { return -1; }
    regs  = stack->maybeGrow(regs, 256);
    int nExpectedArgs = IS_O_TYPE(A, O_FUNC) ? ((Func *)GET_OBJ(A))->proto->nArgs : NARGS_CFUNC;
    nEffArgs = prepareStackForCall(regs, nExpectedArgs, nEffArgs, gc);

    if (IS_CF(A) || IS_O_TYPE(A, O_CFUNC)) {
        if (IS_CF(A)) {
            tfunc f = GET_CF(A);
            *regs = f(this, CFunc::CFUNC_CALL, 0, regs, nEffArgs);
        } else {
            ((CFunc *) GET_OBJ(A))->call(this, regs, nEffArgs);
        }
        return 0;
    }

    unsigned code = 0;
    Value B;
    Value *ptrC;
    Func *activeFunc = (Func *) GET_OBJ(A);
    unsigned *pc = (unsigned *) activeFunc->proto->code.buf();

    static void *dispatch[] = {
#define _(name) &&name
#include "opcodes.inc"
#undef _
    };

    assert(sizeof(dispatch)/sizeof(dispatch[0]) == N_OPCODES);

    copyUpvals(activeFunc, regs);

    STEP;

 JMP:  pc += OD(code);    STEP;
 JT:   if (!IS_FALSE(*ptrC)) { pc += OD(code);  } STEP;
 JF:   if ( IS_FALSE(*ptrC)) { pc += OD(code);  } STEP;
 JLT:  if (lessThan(A, B))   { pc += OSC(code); } STEP;
 JNIS: if (A != B)           { pc += OSC(code); } STEP;

 FOR: 
    A = *(ptrC + 1);
    B = *(ptrC + 2);
    if (!IS_NUM(A) || !IS_NUM(B)) { goto error; } // E_FOR_NOT_NUMBER
    *ptrC = B;
    if (!(GET_NUM(B) < GET_NUM(A))) { pc += OD(code); }
    STEP;

 LOOP: {
        const double counter = GET_NUM(*ptrC) + 1;
        if (counter < GET_NUM(*(ptrC+1))) { pc += OD(code); }
        *ptrC = VAL_NUM(counter);
        STEP;
    }

 FUNC:
    assert(IS_PROTO(A));
    *ptrC = VAL_OBJ(Func::alloc(gc, PROTO(A), regs + 256, regs, OB(code)));
    STEP;

    // index, A[B]
 GETI: *ptrC = types->type(A)->indexGet(A, B); if (*ptrC == VERR) { goto error; } STEP;
 GETF: *ptrC = types->type(A)->fieldGet(A, B); if (*ptrC == VERR) { goto error; } STEP;
    
 SETI: if (!types->type(*ptrC)->indexSet(*ptrC, A, B)) { goto error; } STEP;
 SETF: if (!types->type(*ptrC)->fieldSet(*ptrC, A, B)) { goto error; } STEP;
    /*
      const int oa = OA(code);
      const int ob = OB(code);
      int top = max(oa, ob) + 1;
      top = max(top, activeFunc->proto->localsTop);
      Value *base = regs + top;
      printf("top %d\n", top);
      base[0] = A;
      base[1] = B;
      int cPos = ptrC - regs;
      DO_CALL(v, 2, regs, base, stack);
      regs[cPos] = base[0];
      break;
      if (*ptrC == VERR) { goto error; }
    */
        
 GETS: *ptrC = getSlice(gc, A, B, regs[OB(code)+1]); if (*ptrC==VERR) { goto error; } STEP;
 SETS: if (setSlice(*ptrC, A, regs[OA(code)+1], B)) { goto error; } STEP;

 RET: {
        regs[0] = A;
        Value *root = stack->base;
        gc->maybeCollect(root, regs - root + 1);
#if FAST_CALL
        if (!retInfo.size()) {
            return 0;
        }
        RetInfo *ri = retInfo.top();
        pc         = ri->pc;
        regs       = stack->base + ri->base;
        activeFunc = ri->func;
        retInfo.pop();
        copyUpvals(activeFunc, regs);
        STEP;
#else
        return 0;
#endif
    }

CALL: { 
        if (!IS_OBJ(A) && !IS_CF(A)) { goto error; } // E_CALL_NOT_FUNC
        int nEffArgs = OSB(code);
        assert(nEffArgs != 0);
        Value *base = ptrC;
#if FAST_CALL
        if (IS_O_TYPE(A, O_FUNC)) {
            Func *f = (Func *) GET_OBJ(A);
            Proto *proto = f->proto;
            prepareStackForCall(base, proto->nArgs, nEffArgs, gc);
            RetInfo *ret = retInfo.push();
            ret->pc    = pc;
            ret->base  = regs - stack->base;
            ret->func  = activeFunc;
            regs = stack->maybeGrow(base, 256);
            copyUpvals(f, regs);
            pc   = proto->code.buf();
            activeFunc = f;
        } else {
#endif
            int ret = DO_CALL(A, nEffArgs, regs, base, stack);
            if (ret) { goto error; }
#if FAST_CALL
        }
#endif
        STEP;
    }
    
 MOVEUP: {
        const int slot = regs + 256 - ptrC;
        activeFunc->setUp(slot, A);
    }
    
 MOVE_R: *ptrC = A; STEP;
 MOVE_I: *ptrC = VAL_NUM(OD(code)); STEP;
 MOVE_V: {
        int id = OA(code);
        *ptrC =
            id == CONST_NIL          ? VNIL :
            id == CONST_EMPTY_STRING ? EMPTY_STRING :
            id == CONST_EMPTY_ARRAY  ? VAL_OBJ(emptyArray->copy(gc)) :
            VAL_OBJ(emptyMap->copy(gc));
        STEP;
    }
    
 MOVE_C: {
        Value v = *pc | (((u64) *(pc+1)) << 32);
        pc += 2;
        if (IS_ARRAY(v)) {
            v = VAL_OBJ(ARRAY(v)->copy(gc));
        } else if (IS_MAP(v)) {
            v = VAL_OBJ(MAP(v)->copy(gc));
        }
        *ptrC = v;
        STEP;
    }
 LEN:    *ptrC = VAL_NUM(len(A)); STEP;
 NOTL:   *ptrC = IS_FALSE(A) ? TRUE : FALSE; STEP;
    // notb: *ptrC = IS_INT(A)? VAL_INT(~getInteger(A)):ERROR(E_WRONG_TYPE); STEP;

 ADD: *ptrC = doAdd(gc, A, B); if (*ptrC == VERR) { goto error; } STEP;
 SUB: *ptrC = BINOP(-, A, B); STEP;
 MUL: *ptrC = BINOP(*, A, B); STEP;
 DIV: *ptrC = BINOP(/, A, B); STEP;
 MOD: *ptrC = doMod(A, B); if (*ptrC == VERR) { goto error; } STEP;
 POW: *ptrC = doPow(A, B); if (*ptrC == VERR) { goto error; } STEP;

 AND: *ptrC = BITOP(&,  A, B); STEP;
 OR:  *ptrC = BITOP(|,  A, B); STEP;
 XOR: *ptrC = BITOP(^,  A, B); STEP;

 SHL_RR: ERR(!IS_NUM(B), E_WRONG_TYPE); *ptrC = doSHL(A, (int)GET_NUM(B)); STEP;
 SHR_RR: ERR(!IS_NUM(B), E_WRONG_TYPE); *ptrC = doSHR(A, (int)GET_NUM(B)); STEP;
 SHL_RI: *ptrC = doSHL(A, OSB(code));       STEP;
 SHR_RI: *ptrC = doSHR(A, OSB(code));       STEP;

 EQ:  *ptrC = equals(A, B)  ? TRUE : FALSE; STEP;
 NEQ: *ptrC = !equals(A, B) ? TRUE : FALSE; STEP;
 IS:  *ptrC = A == B ? TRUE : FALSE; STEP;
 NIS: *ptrC = A != B ? TRUE : FALSE; STEP;

 LT:  *ptrC = lessThan(A, B) ? TRUE : FALSE; STEP;
 LE:  *ptrC = (equals(A, B) || lessThan(A, B)) ? TRUE : FALSE; STEP;

 error: return pc - (unsigned *) activeFunc->proto->code.buf();
}