[Qemu-devel] [PATCH 8/9] target-arm/arm-semi.c: SYS_EXIT on A64 takes a parameter block

[Peter Maydell <peter.maydell@linaro.org>]

The A64 semihosting API changes the interface for SYS_EXIT so
that instead of taking a single exception type in a register,
it takes a parameter block containing the exception type and
a sub-code. Implement this.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target-arm/arm-semi.c | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/target-arm/arm-semi.c b/target-arm/arm-semi.c
index 1d0d7aa..d7cff3d 100644
--- a/target-arm/arm-semi.c
+++ b/target-arm/arm-semi.c
@@ -619,9 +619,24 @@ target_ulong do_arm_semihosting(CPUARMState *env)
             return 0;
         }
     case TARGET_SYS_EXIT:
-        /* ARM specifies only Stopped_ApplicationExit as normal
-         * exit, everything else is considered an error */
-        ret = (args == ADP_Stopped_ApplicationExit) ? 0 : 1;
+        if (is_a64(env)) {
+            /* The A64 version of this call takes a parameter block,
+             * so the application-exit type can return a subcode which
+             * is the exit status code from the application.
+             */
+            GET_ARG(0);
+            GET_ARG(1);
+
+            if (arg0 == ADP_Stopped_ApplicationExit) {
+                ret = arg1;
+            } else {
+                ret = 1;
+            }
+        } else {
+            /* ARM specifies only Stopped_ApplicationExit as normal
+             * exit, everything else is considered an error */
+            ret = (args == ADP_Stopped_ApplicationExit) ? 0 : 1;
+        }
         gdb_exit(env, ret);
         exit(ret);
     case TARGET_SYS_SYNCCACHE:
-- 
1.9.1