From 5915b67013eb8c3a84e3ef05e6ba4eae55ccd173 Mon Sep 17 00:00:00 2001 From: Helge Deller Date: Wed, 3 Jan 2024 20:35:18 +0100 Subject: [PATCH] target/hppa: Avoid accessing %gr0 when raising exception 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 Reviewed-by: Richard Henderson Tested-by: Bruno Haible --- 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;