linux-user: Add support for big-endian aarch64

Enable big-endian mode for data accesses on aarch64 for big-endian linux
user mode. Activate it for all exception levels as documented by ARM:
Set the SCTLR EE bit for ELs 1 through 3. Additionally set bit E0E in
EL1 to enable it in EL0 as well.

Signed-off-by: Michael Weiser <michael.weiser@gmx.de>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20171220212308.12614-2-michael.weiser@gmx.de
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

diff --git a/linux-user/main.c b/linux-user/main.c
index 99a551b04f7aa0e3f810c5315b35be9776c77454..450eb3ce650318d4406a5f6d12a572d493699f43 100644 (file)
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -4629,6 +4629,12 @@ int main(int argc, char **argv, char **envp)
         }
         env->pc = regs->pc;
         env->xregs[31] = regs->sp;
+#ifdef TARGET_WORDS_BIGENDIAN
+        env->cp15.sctlr_el[1] |= SCTLR_E0E;
+        for (i = 1; i < 4; ++i) {
+            env->cp15.sctlr_el[i] |= SCTLR_EE;
+        }
+#endif
     }
 #elif defined(TARGET_ARM)
     {