target/arm: Fix output of PAuth Auth

The ARM pseudocode installs the error_code into the original
pointer, not the encrypted pointer.  The difference applies
within the 7 bits of pac data; the result should be the sign
extension of bit 55.

Add a testcase to that effect.

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

1 files changed, 2 insertions, 2 deletions

diff --git a/target/arm/pauth_helper.c b/target/arm/pauth_helper.c
index 7f30ae7..d3194f2 100644
--- a/target/arm/pauth_helper.c
+++ b/target/arm/pauth_helper.c
@@ -344,9 +344,9 @@ static uint64_t pauth_auth(CPUARMState *env, uint64_t ptr, uint64_t modifier,
     if (unlikely(extract64(test, bot_bit, top_bit - bot_bit))) {
         int error_code = (keynumber << 1) | (keynumber ^ 1);
         if (param.tbi) {
-            return deposit64(ptr, 53, 2, error_code);
+            return deposit64(orig_ptr, 53, 2, error_code);
         } else {
-            return deposit64(ptr, 61, 2, error_code);
+            return deposit64(orig_ptr, 61, 2, error_code);
         }
     }
     return orig_ptr;