1 %default {"preinstr":"", "result":"r0", "chkzero":"0"} 2 /* 3 * Generic 32-bit binary operation. Provide an "instr" line that 4 * 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. Note that we 10 * *don't* check for (INT_MIN / -1) here, because the ARM math lib 11 * handles it correctly. 12 * 13 * For: add-int, sub-int, mul-int, div-int, rem-int, and-int, or-int, 14 * xor-int, shl-int, shr-int, ushr-int, add-float, sub-float, 15 * mul-float, div-float, rem-float 16 */ 17 /* binop vAA, vBB, vCC */ 18 FETCH r0, 1 @ r0<- CCBB 19 mov r9, rINST, lsr #8 @ r9<- AA 20 mov r3, r0, lsr #8 @ r3<- CC 21 and r2, r0, #255 @ r2<- BB 22 GET_VREG r1, r3 @ r1<- vCC 23 GET_VREG r0, r2 @ r0<- vBB 24 .if $chkzero 25 cmp r1, #0 @ is second operand zero? 26 beq common_errDivideByZero 27 .endif 28 29 FETCH_ADVANCE_INST 2 @ advance rPC, load rINST 30 $preinstr @ optional op; may set condition codes 31 $instr @ $result<- op, r0-r3 changed 32 GET_INST_OPCODE ip @ extract opcode from rINST 33 SET_VREG $result, r9 @ vAA<- $result 34 GOTO_OPCODE ip @ jump to next instruction 35 /* 11-14 instructions */ 36
