From 923d25365fbdff17fa4c8c2883960be07c3dad56 Mon Sep 17 00:00:00 2001
From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Date: Fri, 5 May 2017 09:07:15 +0200
Subject: [PATCH] user-exec: fix usage of mcontext structure on ARM/uClibc

user-exec.c has some conditional code to decide how to use the
mcontext structure. Unfortunately, since uClibc defines __GLIBC__, but
with old versions of __GLIBC__ and __GLIBC_MINOR__, an old code path
gets used, which doesn't apply to uClibc.

Fix this by excluding __UCLIBC__, which ensures we fall back to the
general case of using uc_mcontext.arm_pc, which works fine with
uClibc.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
---
 accel/tcg/user-exec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/accel/tcg/user-exec.c b/accel/tcg/user-exec.c
index 4be78eb9b3..0a690bec55 100644
--- a/accel/tcg/user-exec.c
+++ b/accel/tcg/user-exec.c
@@ -508,7 +508,7 @@ int cpu_signal_handler(int host_signum, void *pinfo,
 
 #if defined(__NetBSD__)
     pc = uc->uc_mcontext.__gregs[_REG_R15];
-#elif defined(__GLIBC__) && (__GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ <= 3))
+#elif defined(__GLIBC__) && !defined(__UCLIBC__) && (__GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ <= 3))
     pc = uc->uc_mcontext.gregs[R15];
 #else
     pc = uc->uc_mcontext.arm_pc;
-- 
2.25.3