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s390x/tcg: implement SET CLOCK 

This allows a guest to change its TOD. We already take care of updating
all CKC timers from within S390TODClass.

Use MO_ALIGN to load the operand manually - this will properly trigger a
SPECIFICATION exception.

Acked-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20180627134410.4901-8-david@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
David Hildenbrand 2018-06-27 15:44:08 +02:00 committed by Cornelia Huck
parent 345f1ab96e
commit 9dc6753718
4 changed files with 27 additions and 2 deletions
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1
target/s390x/helper.h
View File

@ -127,6 +127,7 @@ DEF_HELPER_4(diag, void, env, i32, i32, i32)
DEF_HELPER_3(load_psw, noreturn, env, i64, i64)
DEF_HELPER_FLAGS_2(spx, TCG_CALL_NO_RWG, void, env, i64)
DEF_HELPER_FLAGS_1(stck, TCG_CALL_NO_RWG_SE, i64, env)
DEF_HELPER_FLAGS_2(sck, TCG_CALL_NO_RWG, i32, env, i64)
DEF_HELPER_FLAGS_2(sckc, TCG_CALL_NO_RWG, void, env, i64)
DEF_HELPER_FLAGS_2(sckpf, TCG_CALL_NO_RWG, void, env, i64)
DEF_HELPER_FLAGS_1(stckc, TCG_CALL_NO_RWG, i64, env)

3
target/s390x/insn-data.def
View File

@ -997,8 +997,7 @@
/* SET ADDRESS SPACE CONTROL FAST */
C(0xb279, SACF, S, Z, 0, a2, 0, 0, sacf, 0)
/* SET CLOCK */
/* ??? Not implemented - is it necessary? */
C(0xb204, SCK, S, Z, 0, 0, 0, 0, 0, 0)
C(0xb204, SCK, S, Z, la2, 0, 0, 0, sck, 0)
/* SET CLOCK COMPARATOR */
C(0xb206, SCKC, S, Z, 0, m2_64a, 0, 0, sckc, 0)
/* SET CLOCK PROGRAMMABLE FIELD */

16
target/s390x/misc_helper.c
View File

@ -184,6 +184,22 @@ void tcg_s390_tod_updated(CPUState *cs, run_on_cpu_data opaque)
helper_sckc(env, env->ckc);
}
/* Set Clock */
uint32_t HELPER(sck)(CPUS390XState *env, uint64_t tod_low)
{
S390TODState *td = s390_get_todstate();
S390TODClass *tdc = S390_TOD_GET_CLASS(td);
S390TOD tod = {
.high = 0,
.low = tod_low,
};
qemu_mutex_lock_iothread();
tdc->set(td, &tod, &error_abort);
qemu_mutex_unlock_iothread();
return 0;
}
/* Set Tod Programmable Field */
void HELPER(sckpf)(CPUS390XState *env, uint64_t r0)
{

9
target/s390x/translate.c
View File

@ -4016,6 +4016,15 @@ static DisasJumpType op_stcke(DisasContext *s, DisasOps *o)
return DISAS_NEXT;
}
static DisasJumpType op_sck(DisasContext *s, DisasOps *o)
{
check_privileged(s);
tcg_gen_qemu_ld_i64(o->in1, o->addr1, get_mem_index(s), MO_TEQ | MO_ALIGN);
gen_helper_sck(cc_op, cpu_env, o->in1);
set_cc_static(s);
return DISAS_NEXT;
}
static DisasJumpType op_sckc(DisasContext *s, DisasOps *o)
{
check_privileged(s);