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target/hppa: Avoid accessing %gr0 when raising exception

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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 <deller@gmx.de>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Tested-by: Bruno Haible <bruno@clisp.org>
This commit is contained in:
Helge Deller 2024-01-03 20:35:18 +01:00
parent ed35afcb33
commit 5915b67013
1 changed files with 1 additions and 1 deletions
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target/hppa/mem_helper.c
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@ -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;