• Martin Schwidefsky's avatar
    s390: fix save and restore of the floating-point-control register · 4725c860
    Martin Schwidefsky authored
    The FPC_VALID_MASK has been used to check the validity of the value
    to be loaded into the floating-point-control register. With the
    introduction of the floating-point extension facility and the
    decimal-floating-point additional bits have been defined which need
    to be checked in a non straight forward way. So far these bits have
    been ignored which can cause an incorrect results for decimal-
    floating-point operations, e.g. an incorrect rounding mode to be
    set after signal return.
    The static check with the FPC_VALID_MASK is replaced with a trial
    load of the floating-point-control value, see test_fp_ctl.
    In addition an information leak with the padding word between the
    floating-point-control word and the floating-point registers in
    the s390_fp_regs is fixed.
    Reported-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
    Reviewed-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
    Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
signal.c 11.8 KB