target/s390x: Implement STCK et al for CONFIG_USER_ONLY

This is a non-privileged instruction that was only implemented
for system mode.  However, the stck instruction is used by glibc,
so this was causing SIGILL for programs run under debian stretch.

Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20190212053044.29015-3-richard.henderson@linaro.org>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>

target/s390x/helper.h

@@ -121,13 +121,13 @@ DEF_HELPER_4(cu41, i32, env, i32, i32, i32)
 DEF_HELPER_4(cu42, i32, env, i32, i32, i32)
 DEF_HELPER_5(msa, i32, env, i32, i32, i32, i32)
 DEF_HELPER_FLAGS_1(stpt, TCG_CALL_NO_RWG, i64, env)
+DEF_HELPER_FLAGS_1(stck, TCG_CALL_NO_RWG_SE, i64, env)
 
 #ifndef CONFIG_USER_ONLY
 DEF_HELPER_3(servc, i32, env, i64, i64)
 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)

target/s390x/insn-data.def

@@ -837,6 +837,12 @@
     C(0xe33e, STRV,    RXY_a, Z,   la2, r1_32u, new, m1_32, rev32, 0)
     C(0xe32f, STRVG,   RXY_a, Z,   la2, r1_o, new, m1_64, rev64, 0)
 
+/* STORE CLOCK */
+    C(0xb205, STCK,    S,     Z,   la2, 0, new, m1_64, stck, 0)
+    C(0xb27c, STCKF,   S,     SCF, la2, 0, new, m1_64, stck, 0)
+/* STORE CLOCK EXTENDED */
+    C(0xb278, STCKE,   S,     Z,   0, a2, 0, 0, stcke, 0)
+
 /* STORE FACILITY LIST EXTENDED */
     C(0xb2b0, STFLE,   S,  SFLE,   0, a2, 0, 0, stfle, 0)
 /* STORE FPC */
@@ -1020,11 +1026,6 @@
     F(0x8000, SSM,     S,     Z,   0, m2_8u, 0, 0, ssm, 0, IF_PRIV)
 /* SIGNAL PROCESSOR */
     F(0xae00, SIGP,    RS_a,  Z,   0, a2, 0, 0, sigp, 0, IF_PRIV)
-/* STORE CLOCK */
-    C(0xb205, STCK,    S,     Z,   la2, 0, new, m1_64, stck, 0)
-    C(0xb27c, STCKF,   S,     SCF, la2, 0, new, m1_64, stck, 0)
-/* STORE CLOCK EXTENDED */
-    C(0xb278, STCKE,   S,     Z,   0, a2, 0, 0, stcke, 0)
 /* STORE CLOCK COMPARATOR */
     F(0xb207, STCKC,   S,     Z,   la2, 0, new, m1_64a, stckc, 0, IF_PRIV)
 /* STORE CONTROL */

target/s390x/misc_helper.c

@@ -30,6 +30,7 @@
 #include "exec/cpu_ldst.h"
 #include "qapi/error.h"
 #include "tcg_s390x.h"
+#include "s390-tod.h"
 
 #if !defined(CONFIG_USER_ONLY)
 #include "sysemu/cpus.h"
@@ -76,8 +77,28 @@ uint64_t HELPER(stpt)(CPUS390XState *env)
 #endif
 }
 
-#ifndef CONFIG_USER_ONLY
+/* Store Clock */
+uint64_t HELPER(stck)(CPUS390XState *env)
+{
+#ifdef CONFIG_USER_ONLY
+    struct timespec ts;
+    uint64_t ns;
+
+    clock_gettime(CLOCK_REALTIME, &ts);
+    ns = ts.tv_sec * NANOSECONDS_PER_SECOND + ts.tv_nsec;
+
+    return TOD_UNIX_EPOCH + time2tod(ns);
+#else
+    S390TODState *td = s390_get_todstate();
+    S390TODClass *tdc = S390_TOD_GET_CLASS(td);
+    S390TOD tod;
 
+    tdc->get(td, &tod, &error_abort);
+    return tod.low;
+#endif
+}
+
+#ifndef CONFIG_USER_ONLY
 /* SCLP service call */
 uint32_t HELPER(servc)(CPUS390XState *env, uint64_t r1, uint64_t r2)
 {
@@ -138,17 +159,6 @@ void HELPER(spx)(CPUS390XState *env, uint64_t a1)
     tlb_flush_page(cs, TARGET_PAGE_SIZE);
 }
 
-/* Store Clock */
-uint64_t HELPER(stck)(CPUS390XState *env)
-{
-    S390TODState *td = s390_get_todstate();
-    S390TODClass *tdc = S390_TOD_GET_CLASS(td);
-    S390TOD tod;
-
-    tdc->get(td, &tod, &error_abort);
-    return tod.low;
-}
-
 static void update_ckc_timer(CPUS390XState *env)
 {
     S390TODState *td = s390_get_todstate();

target/s390x/translate.c

@@ -4060,6 +4060,7 @@ static DisasJumpType op_stap(DisasContext *s, DisasOps *o)
     tcg_gen_ld32u_i64(o->out, cpu_env, offsetof(CPUS390XState, core_id));
     return DISAS_NEXT;
 }
+#endif
 
 static DisasJumpType op_stck(DisasContext *s, DisasOps *o)
 {
@@ -4096,6 +4097,7 @@ static DisasJumpType op_stcke(DisasContext *s, DisasOps *o)
     return DISAS_NEXT;
 }
 
+#ifndef CONFIG_USER_ONLY
 static DisasJumpType op_sck(DisasContext *s, DisasOps *o)
 {
     tcg_gen_qemu_ld_i64(o->in1, o->addr1, get_mem_index(s), MO_TEQ | MO_ALIGN);