1 %default {"preinstr":"", "result":"r0", "chkzero":"0"} 2 /* 3 * Generic 32-bit "/2addr" binary operation. Provide an "instr" line 4 * that specifies an instruction that performs "result = r0 op r1". 5 * This could be an ARM instruction or a function call. (If the result 6 * comes back in a register other than r0, you can override "result".) 7 * 8 * If "chkzero" is set to 1, we perform a divide-by-zero check on 9 * vCC (r1). Useful for integer division and modulus. 10 * 11 * For: add-int/2addr, sub-int/2addr, mul-int/2addr, div-int/2addr, 12 * rem-int/2addr, and-int/2addr, or-int/2addr, xor-int/2addr, 13 * shl-int/2addr, shr-int/2addr, ushr-int/2addr, add-float/2addr, 14 * sub-float/2addr, mul-float/2addr, div-float/2addr, rem-float/2addr 15 */ 16 /* binop/2addr vA, vB */ 17 mov r9, rINST, lsr #8 @ r9<- A+ 18 mov r3, rINST, lsr #12 @ r3<- B 19 and r9, r9, #15 20 GET_VREG(r1, r3) @ r1<- vB 21 GET_VREG(r0, r9) @ r0<- vA 22 .if $chkzero 23 cmp r1, #0 @ is second operand zero? 24 beq common_errDivideByZero 25 .endif 26 FETCH_ADVANCE_INST(1) @ advance rPC, load rINST 27 28 $preinstr @ optional op; may set condition codes 29 $instr @ $result<- op, r0-r3 changed 30 GET_INST_OPCODE(ip) @ extract opcode from rINST 31 SET_VREG($result, r9) @ vAA<- $result 32 GOTO_OPCODE(ip) @ jump to next instruction 33 /* 10-13 instructions */ 34
