linux-user/nios2: Fix clone child return

The child side of clone needs to set the secondary
syscall return value, r7, to indicate syscall success.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220421151735.31996-3-richard.henderson@linaro.org>

diff --git a/linux-user/nios2/target_cpu.h b/linux-user/nios2/target_cpu.h
index 2d2008f0026bea4919a2bdd5d07c430595561374..830b4c0741c867b90f76ff8934d8d7d790ea56e8 100644 (file)
--- a/linux-user/nios2/target_cpu.h
+++ b/linux-user/nios2/target_cpu.h
@@ -27,6 +27,7 @@ static inline void cpu_clone_regs_child(CPUNios2State *env, target_ulong newsp,
         env->regs[R_SP] = newsp;
     }
     env->regs[R_RET0] = 0;
+    env->regs[7] = 0;
 }
 
 static inline void cpu_clone_regs_parent(CPUNios2State *env, unsigned flags)