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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 <richard.henderson@linaro.org>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20191106113318.10226-13-richard.henderson@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Richard Henderson 2019-11-06 12:33:18 +01:00 committed by Laurent Vivier
parent 2ad983e0f4
commit 5849dfe410
1 changed files with 9 additions and 0 deletions
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9
linux-user/alpha/target_cpu.h
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@ -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)