%default {"preinstr":"", "result":"w0", "chkzero":"0"} /* * Generic 32-bit "lit8" binary operation. Provide an "instr" line * that specifies an instruction that performs "result = w0 op w1". * This could be an ARM instruction or a function call. (If the result * comes back in a register other than w0, you can override "result".) * * If "chkzero" is set to 1, we perform a divide-by-zero check on * vCC (w1). Useful for integer division and modulus. * * For: add-int/lit8, rsub-int/lit8, mul-int/lit8, div-int/lit8, * rem-int/lit8, and-int/lit8, or-int/lit8, xor-int/lit8, * shl-int/lit8, shr-int/lit8, ushr-int/lit8 */ /* binop/lit8 vAA, vBB, #+CC */ FETCH_S w3, 1 // w3<- ssssCCBB (sign-extended for CC lsr w9, wINST, #8 // w9<- AA and w2, w3, #255 // w2<- BB GET_VREG w0, w2 // w0<- vBB asr w1, w3, #8 // w1<- ssssssCC (sign extended) .if $chkzero cbz w1, common_errDivideByZero .endif FETCH_ADVANCE_INST 2 // advance rPC, load rINST $preinstr // optional op; may set condition codes $instr // $result<- op, w0-w3 changed GET_INST_OPCODE ip // extract opcode from rINST SET_VREG $result, w9 // vAA<- $result GOTO_OPCODE ip // jump to next instruction /* 10-12 instructions */