or equal to the dst size. MOVD dst_len+40(FP), R4 CMP R0, R4 BGT crash MOVD R2, R4 MOVD R2, R6 MOVD R2, R8 MOVD R3, R5 MOVD R3, R7 MOVD R3, R9 ADDW $1, R5 ADDW $2, R7 ADDW $3, R9 incr: CMP R0, $64 BLT tail STMG R2, R9, (R1) ADDW $4, R3 ADDW $4, R5 ADDW $4, R7 ADDW $4, R9 MOVD $64(R1), R1 SUB $64, R0 BR incr tail: CMP R0, $0 BEQ crypt STMG R2, R3, (R1) ADDW $1, R3 MOVD $16(R1), R1 SUB $16, R0 BR tail crypt: STMG R2, R3, (R12) // update next counter value MOVD fn+0(FP), R0 // function code (encryption)...