1 files changed, 38 insertions, 0 deletions
diff --git a/linux-user/aarch64/gcs-internal.h b/linux-user/aarch64/gcs-internal.h
new file mode 100644
index 0000000..e586c7e
--- /dev/null
+++ b/linux-user/aarch64/gcs-internal.h
@@ -0,0 +1,38 @@
+/*
+ * AArch64 gcs functions for linux-user
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+#ifndef AARCH64_GCS_INTERNAL_H
+#define AARCH64_GCS_INTERNAL_H
+
+#ifndef PR_SHADOW_STACK_ENABLE
+# define PR_SHADOW_STACK_ENABLE  (1U << 0)
+# define PR_SHADOW_STACK_WRITE   (1U << 1)
+# define PR_SHADOW_STACK_PUSH    (1U << 2)
+#endif
+
+static inline uint64_t gcs_get_el0_mode(CPUArchState *env)
+{
+    uint64_t cr = env->cp15.gcscr_el[0];
+    abi_ulong flags = 0;
+
+    flags |= cr & GCSCR_PCRSEL ? PR_SHADOW_STACK_ENABLE : 0;
+    flags |= cr & GCSCR_STREN ? PR_SHADOW_STACK_WRITE : 0;
+    flags |= cr & GCSCR_PUSHMEN ? PR_SHADOW_STACK_PUSH : 0;
+
+    return flags;
+}
+
+static inline void gcs_set_el0_mode(CPUArchState *env, uint64_t flags)
+{
+    uint64_t cr = GCSCRE0_NTR;
+
+    cr |= flags & PR_SHADOW_STACK_ENABLE ? GCSCR_RVCHKEN | GCSCR_PCRSEL : 0;
+    cr |= flags & PR_SHADOW_STACK_WRITE ? GCSCR_STREN : 0;
+    cr |= flags & PR_SHADOW_STACK_PUSH ? GCSCR_PUSHMEN : 0;
+
+    env->cp15.gcscr_el[0] = cr;
+}
+
+#endif