aboutsummaryrefslogtreecommitdiffstats
path: root/arch/sparc/lib/GENcopy_to_user.S
diff options
context:
space:
mode:
Diffstat (limited to 'arch/sparc/lib/GENcopy_to_user.S')
-rw-r--r--arch/sparc/lib/GENcopy_to_user.S38
1 files changed, 38 insertions, 0 deletions
diff --git a/arch/sparc/lib/GENcopy_to_user.S b/arch/sparc/lib/GENcopy_to_user.S
new file mode 100644
index 000000000000..bb3f7084daf9
--- /dev/null
+++ b/arch/sparc/lib/GENcopy_to_user.S
@@ -0,0 +1,38 @@
+/* GENcopy_to_user.S: Generic sparc64 copy to userspace.
+ *
+ * Copyright (C) 2007 David S. Miller (davem@davemloft.net)
+ */
+
+#define EX_ST(x) \
+98: x; \
+ .section .fixup; \
+ .align 4; \
+99: retl; \
+ mov 1, %o0; \
+ .section __ex_table,"a";\
+ .align 4; \
+ .word 98b, 99b; \
+ .text; \
+ .align 4;
+
+#ifndef ASI_AIUS
+#define ASI_AIUS 0x11
+#endif
+
+#define FUNC_NAME GENcopy_to_user
+#define STORE(type,src,addr) type##a src, [addr] ASI_AIUS
+#define EX_RETVAL(x) 0
+
+#ifdef __KERNEL__
+ /* Writing to %asi is _expensive_ so we hardcode it.
+ * Reading %asi to check for KERNEL_DS is comparatively
+ * cheap.
+ */
+#define PREAMBLE \
+ rd %asi, %g1; \
+ cmp %g1, ASI_AIUS; \
+ bne,pn %icc, memcpy_user_stub; \
+ nop
+#endif
+
+#include "GENmemcpy.S"