From: Helge Deller <del...@gmx.de>
The value of unwind_breg may reference register %r0, but we need to avoid
accessing gr0 directly and use the value 0 instead.
At runtime I've seen unwind_breg being zero with the Linux kernel when
rfi is used to jump to smp_callin().
Signed-off-by: Helge Deller <del...@gmx.de>
Reviewed-by: Richard Henderson <richard.hender...@linaro.org>
Tested-by: Bruno Haible <br...@clisp.org>
---
target/hppa/mem_helper.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/target/hppa/mem_helper.c b/target/hppa/mem_helper.c
index 4c28c58ee9..1387f4a64b 100644
--- a/target/hppa/mem_helper.c
+++ b/target/hppa/mem_helper.c
@@ -341,7 +341,7 @@ raise_exception_with_ior(CPUHPPAState *env, int excp,
uintptr_t retaddr,
cpu_restore_state(cs, retaddr);
- b = env->gr[env->unwind_breg];
+ b = env->unwind_breg ? env->gr[env->unwind_breg] : 0;
b >>= (env->psw & PSW_W ? 62 : 30);
env->cr[CR_IOR] |= b << 62;
--
2.43.0
