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linux-user/s390x: Fix single-stepping SVC

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Currently single-stepping SVC executes two instructions. The reason is
that EXCP_DEBUG for the SVC instruction itself is masked by EXCP_SVC.
Fix by re-raising EXCP_DEBUG.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Message-Id: <20230510230213.330134-2-iii@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
(cherry picked from commit 01b9990a3fb84bb9a14017255ab1a4fa86588215)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
This commit is contained in:
Ilya Leoshkevich 2023-05-11 01:02:12 +02:00 committed by Michael Tokarev
parent 82fc148344
commit 5502e5ca33
1 changed files with 9 additions and 0 deletions
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9
linux-user/s390x/cpu_loop.c
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@ -86,6 +86,15 @@ void cpu_loop(CPUS390XState *env)
} else if (ret != -QEMU_ESIGRETURN) {
env->regs[2] = ret;
}
if (unlikely(cs->singlestep_enabled)) {
/*
* cpu_tb_exec() did not raise EXCP_DEBUG, because it has seen
* that EXCP_SVC was already pending.
*/
cs->exception_index = EXCP_DEBUG;
}
break;
case EXCP_DEBUG: