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Re: [PATCH v2 12/12] linux-user/alpha: Set r20 secondary return value
From: |
Laurent Vivier |
Subject: |
Re: [PATCH v2 12/12] linux-user/alpha: Set r20 secondary return value |
Date: |
Tue, 5 Nov 2019 10:53:59 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1 |
Le 25/10/2019 à 13:39, Richard Henderson a écrit :
> 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 <address@hidden>
> ---
> v2: Do not set the parent secondary return if SETTLS.
> ---
> 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 dd25e18f47..ad408ab5cc 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)
>
Applied to my linux-user branch.
Thanks,
Laurent
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