target/s390x: Implement SRSTU
Reviewed-by: Aurelien Jarno <aurelien@aurel32.net> Signed-off-by: Richard Henderson <rth@twiddle.net>
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@ -13,6 +13,7 @@ DEF_HELPER_FLAGS_3(divu32, TCG_CALL_NO_WG, i64, env, i64, i64)
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DEF_HELPER_FLAGS_3(divs64, TCG_CALL_NO_WG, s64, env, s64, s64)
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DEF_HELPER_FLAGS_4(divu64, TCG_CALL_NO_WG, i64, env, i64, i64, i64)
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DEF_HELPER_3(srst, void, env, i32, i32)
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DEF_HELPER_3(srstu, void, env, i32, i32)
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DEF_HELPER_4(clst, i64, env, i64, i64, i64)
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DEF_HELPER_FLAGS_4(mvn, TCG_CALL_NO_WG, void, env, i32, i64, i64)
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DEF_HELPER_FLAGS_4(mvo, TCG_CALL_NO_WG, void, env, i32, i64, i64)
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@ -737,6 +737,8 @@
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/* SEARCH STRING */
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C(0xb25e, SRST, RRE, Z, 0, 0, 0, 0, srst, 0)
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/* SEARCH STRING UNICODE */
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C(0xb9be, SRSTU, RRE, ETF3, 0, 0, 0, 0, srstu, 0)
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/* SET ACCESS */
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C(0xb24e, SAR, RRE, Z, 0, r2_o, 0, 0, sar, 0)
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@ -576,6 +576,47 @@ void HELPER(srst)(CPUS390XState *env, uint32_t r1, uint32_t r2)
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set_address(env, r2, str + len);
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}
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void HELPER(srstu)(CPUS390XState *env, uint32_t r1, uint32_t r2)
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{
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uintptr_t ra = GETPC();
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uint32_t len;
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uint16_t v, c = env->regs[0];
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uint64_t end, str, adj_end;
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/* Bits 32-47 of R0 must be zero. */
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if (env->regs[0] & 0xffff0000u) {
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cpu_restore_state(ENV_GET_CPU(env), ra);
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program_interrupt(env, PGM_SPECIFICATION, 6);
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}
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str = get_address(env, r2);
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end = get_address(env, r1);
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/* If the LSB of the two addresses differ, use one extra byte. */
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adj_end = end + ((str ^ end) & 1);
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/* Lest we fail to service interrupts in a timely manner, limit the
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amount of work we're willing to do. For now, let's cap at 8k. */
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for (len = 0; len < 0x2000; len += 2) {
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if (str + len == adj_end) {
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/* End of input found. */
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env->cc_op = 2;
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return;
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}
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v = cpu_lduw_data_ra(env, str + len, ra);
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if (v == c) {
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/* Character found. Set R1 to the location; R2 is unmodified. */
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env->cc_op = 1;
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set_address(env, r1, str + len);
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return;
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}
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}
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/* CPU-determined bytes processed. Advance R2 to next byte to process. */
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env->cc_op = 3;
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set_address(env, r2, str + len);
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}
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/* unsigned string compare (c is string terminator) */
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uint64_t HELPER(clst)(CPUS390XState *env, uint64_t c, uint64_t s1, uint64_t s2)
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{
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@ -4298,6 +4298,19 @@ static ExitStatus op_srst(DisasContext *s, DisasOps *o)
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return NO_EXIT;
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}
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static ExitStatus op_srstu(DisasContext *s, DisasOps *o)
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{
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TCGv_i32 r1 = tcg_const_i32(get_field(s->fields, r1));
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TCGv_i32 r2 = tcg_const_i32(get_field(s->fields, r2));
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gen_helper_srstu(cpu_env, r1, r2);
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tcg_temp_free_i32(r1);
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tcg_temp_free_i32(r2);
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set_cc_static(s);
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return NO_EXIT;
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}
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static ExitStatus op_sub(DisasContext *s, DisasOps *o)
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{
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tcg_gen_sub_i64(o->out, o->in1, o->in2);
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