s390x/tcg: refactor stfl(e) to use s390_get_feat_block()
Refactor it to use s390_get_feat_block(). Directly write into the mapped lowcore with stfl and make sure it is really only compiled if needed. While at it, add an alignment check for STFLE and avoid potential_page_fault() by properly restoring the CPU state. Due to s390_get_feat_block(), we will now also indicate the "Configuration-z-architectural-mode", which is with new SIGP code the right thing to do. Signed-off-by: David Hildenbrand <david@redhat.com> Message-Id: <20170928203708.9376-30-david@redhat.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Cornelia Huck <cohuck@redhat.com>
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@ -475,66 +475,57 @@ void HELPER(per_ifetch)(CPUS390XState *env, uint64_t addr)
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}
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#endif
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/* The maximum bit defined at the moment is 129. */
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#define MAX_STFL_WORDS 3
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static uint8_t stfl_bytes[2048];
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static unsigned int used_stfl_bytes;
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/* Canonicalize the current cpu's features into the 64-bit words required
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by STFLE. Return the index-1 of the max word that is non-zero. */
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static unsigned do_stfle(CPUS390XState *env, uint64_t words[MAX_STFL_WORDS])
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static void prepare_stfl(void)
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{
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S390CPU *cpu = s390_env_get_cpu(env);
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const unsigned long *features = cpu->model->features;
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unsigned max_bit = 0;
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S390Feat feat;
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static bool initialized;
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int i;
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memset(words, 0, sizeof(uint64_t) * MAX_STFL_WORDS);
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if (test_bit(S390_FEAT_ZARCH, features)) {
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/* z/Architecture is always active if around */
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words[0] = 1ull << (63 - 2);
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/* racy, but we don't care, the same values are always written */
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if (initialized) {
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return;
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}
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for (feat = find_first_bit(features, S390_FEAT_MAX);
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feat < S390_FEAT_MAX;
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feat = find_next_bit(features, S390_FEAT_MAX, feat + 1)) {
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const S390FeatDef *def = s390_feat_def(feat);
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if (def->type == S390_FEAT_TYPE_STFL) {
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unsigned bit = def->bit;
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if (bit > max_bit) {
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max_bit = bit;
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}
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assert(bit / 64 < MAX_STFL_WORDS);
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words[bit / 64] |= 1ULL << (63 - bit % 64);
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s390_get_feat_block(S390_FEAT_TYPE_STFL, stfl_bytes);
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for (i = 0; i < sizeof(stfl_bytes); i++) {
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if (stfl_bytes[i]) {
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used_stfl_bytes = i + 1;
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}
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}
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return max_bit / 64;
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initialized = true;
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}
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#ifndef CONFIG_USER_ONLY
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void HELPER(stfl)(CPUS390XState *env)
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{
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uint64_t words[MAX_STFL_WORDS];
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LowCore *lowcore;
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lowcore = cpu_map_lowcore(env);
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do_stfle(env, words);
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lowcore->stfl_fac_list = cpu_to_be32(words[0] >> 32);
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prepare_stfl();
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memcpy(&lowcore->stfl_fac_list, stfl_bytes, sizeof(lowcore->stfl_fac_list));
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cpu_unmap_lowcore(lowcore);
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}
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#endif
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uint32_t HELPER(stfle)(CPUS390XState *env, uint64_t addr)
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{
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uint64_t words[MAX_STFL_WORDS];
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unsigned count_m1 = env->regs[0] & 0xff;
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unsigned max_m1 = do_stfle(env, words);
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unsigned i;
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const uintptr_t ra = GETPC();
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const int count_bytes = ((env->regs[0] & 0xff) + 1) * 8;
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const int max_bytes = ROUND_UP(used_stfl_bytes, 8);
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int i;
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for (i = 0; i <= count_m1; ++i) {
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cpu_stq_data(env, addr + 8 * i, words[i]);
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if (addr & 0x7) {
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cpu_restore_state(ENV_GET_CPU(env), ra);
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program_interrupt(env, PGM_SPECIFICATION, 4);
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}
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env->regs[0] = deposit64(env->regs[0], 0, 8, max_m1);
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return (count_m1 >= max_m1 ? 0 : 3);
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prepare_stfl();
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for (i = 0; i < count_bytes; ++i) {
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cpu_stb_data_ra(env, addr + i, stfl_bytes[i], ra);
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}
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env->regs[0] = deposit64(env->regs[0], 0, 8, (max_bytes / 8) - 1);
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return count_bytes >= max_bytes ? 0 : 3;
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}
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@ -4143,7 +4143,6 @@ static ExitStatus op_sturg(DisasContext *s, DisasOps *o)
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static ExitStatus op_stfle(DisasContext *s, DisasOps *o)
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{
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potential_page_fault(s);
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gen_helper_stfle(cc_op, cpu_env, o->in2);
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set_cc_static(s);
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return NO_EXIT;
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