From 5849dfe410b3fefec7d54a536cda7ccbf809ebea Mon Sep 17 00:00:00 2001 From: Richard Henderson Date: Wed, 6 Nov 2019 12:33:18 +0100 Subject: [PATCH] linux-user/alpha: Set r20 secondary return value This value is not, as far as I know, used by any linux software, but it is set by the kernel and is part of the ABI. Signed-off-by: Richard Henderson Reviewed-by: Laurent Vivier Message-Id: <20191106113318.10226-13-richard.henderson@linaro.org> Signed-off-by: Laurent Vivier --- linux-user/alpha/target_cpu.h | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/linux-user/alpha/target_cpu.h b/linux-user/alpha/target_cpu.h index dd25e18f47fb..ad408ab5cc8e 100644 --- a/linux-user/alpha/target_cpu.h +++ b/linux-user/alpha/target_cpu.h @@ -27,10 +27,19 @@ static inline void cpu_clone_regs_child(CPUAlphaState *env, target_ulong newsp, } env->ir[IR_V0] = 0; env->ir[IR_A3] = 0; + env->ir[IR_A4] = 1; /* OSF/1 secondary return: child */ } static inline void cpu_clone_regs_parent(CPUAlphaState *env, unsigned flags) { + /* + * OSF/1 secondary return: parent + * Note that the kernel does not do this if SETTLS, because the + * settls argument register is still live after copy_thread. + */ + if (!(flags & CLONE_SETTLS)) { + env->ir[IR_A4] = 0; + } } static inline void cpu_set_tls(CPUAlphaState *env, target_ulong newtls)