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s390x/tcg: fix FP register pair checks 

Valid register pairs are 0/2, 1/3, 4/6, 5/7, 8/10, 9/11, 12/14, 13/15.

R1/R2 always selects the lower number, so the current checks are not
correct as e.g. 2/4 could be selected as a pair.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20180927130303.12236-9-david@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
David Hildenbrand 2018-09-27 15:03:02 +02:00 committed by Cornelia Huck
parent b51cc1d826
commit eba7170b55
1 changed files with 10 additions and 10 deletions
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20
target/s390x/translate.c
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@ -6024,6 +6024,12 @@ static bool is_afp_reg(int reg)
return reg % 2 || reg > 6;
}
static bool is_fp_pair(int reg)
{
/* 0,1,4,5,8,9,12,13: to exclude the others, check for single bit */
return !(reg & 0x2);
}
static DisasJumpType translate_one(CPUS390XState *env, DisasContext *s)
{
const DisasInsn *insn;
@ -6106,17 +6112,11 @@ static DisasJumpType translate_one(CPUS390XState *env, DisasContext *s)
excp = PGM_SPECIFICATION;
}
}
if (spec & SPEC_r1_f128) {
r = get_field(&f, r1);
if (r > 13) {
excp = PGM_SPECIFICATION;
}
if (spec & SPEC_r1_f128 && !is_fp_pair(get_field(&f, r1))) {
excp = PGM_SPECIFICATION;
}
if (spec & SPEC_r2_f128) {
r = get_field(&f, r2);
if (r > 13) {
excp = PGM_SPECIFICATION;
}
if (spec & SPEC_r2_f128 && !is_fp_pair(get_field(&f, r2))) {
excp = PGM_SPECIFICATION;
}
if (excp) {
gen_program_exception(s, excp);