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-rw-r--r--arch/arm/include/asm/global_data.h25
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/arm/include/asm/global_data.h b/arch/arm/include/asm/global_data.h
index 63e4ad5..c69d064 100644
--- a/arch/arm/include/asm/global_data.h
+++ b/arch/arm/include/asm/global_data.h
@@ -44,10 +44,35 @@ struct arch_global_data {
#include <asm-generic/global_data.h>
+#ifdef __clang__
+
+#define DECLARE_GLOBAL_DATA_PTR
+#define gd get_gd()
+
+static inline gd_t *get_gd(void)
+{
+ gd_t *gd_ptr;
+
+#ifdef CONFIG_ARM64
+ /*
+ * Make will already error that reserving x18 is not supported at the
+ * time of writing, clang: error: unknown argument: '-ffixed-x18'
+ */
+ __asm__ volatile("mov %0, x18\n" : "=r" (gd_ptr));
+#else
+ __asm__ volatile("mov %0, r9\n" : "=r" (gd_ptr));
+#endif
+
+ return gd_ptr;
+}
+
+#else
+
#ifdef CONFIG_ARM64
#define DECLARE_GLOBAL_DATA_PTR register volatile gd_t *gd asm ("x18")
#else
#define DECLARE_GLOBAL_DATA_PTR register volatile gd_t *gd asm ("r9")
#endif
+#endif
#endif /* __ASM_GBL_DATA_H */