linux-user/s390x: Save/restore fpc when handling a signal

Linux kernel does this in fpregs_store() and fpregs_load(), so
qemu-user should do this as well.

Found by running valgrind's none/tests/s390x/test_sig.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220817123902.585623-1-iii@linux.ibm.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

diff --git a/linux-user/s390x/signal.c b/linux-user/s390x/signal.c
index 4979c4b01791b98df7e856e8cc6973f4e3763146..f72165576f3bf2d67a232216cc980405d04c21ff 100644 (file)
--- a/linux-user/s390x/signal.c
+++ b/linux-user/s390x/signal.c
@@ -146,6 +146,7 @@ static void save_sigregs(CPUS390XState *env, target_sigregs *sregs)
      * We have to store the fp registers to current->thread.fp_regs
      * to merge them with the emulated registers.
      */
+    __put_user(env->fpc, &sregs->fpregs.fpc);
     for (i = 0; i < 16; i++) {
         __put_user(*get_freg(env, i), &sregs->fpregs.fprs[i]);
     }
@@ -331,6 +332,7 @@ static void restore_sigregs(CPUS390XState *env, target_sigregs *sc)
     for (i = 0; i < 16; i++) {
         __get_user(env->aregs[i], &sc->regs.acrs[i]);
     }
+    __get_user(env->fpc, &sc->fpregs.fpc);
     for (i = 0; i < 16; i++) {
         __get_user(*get_freg(env, i), &sc->fpregs.fprs[i]);
     }