aboutsummaryrefslogtreecommitdiff
path: root/arch/sparc/lib/U1copy_from_user.S
diff options
context:
space:
mode:
Diffstat (limited to 'arch/sparc/lib/U1copy_from_user.S')
-rw-r--r--arch/sparc/lib/U1copy_from_user.S33
1 files changed, 33 insertions, 0 deletions
diff --git a/arch/sparc/lib/U1copy_from_user.S b/arch/sparc/lib/U1copy_from_user.S
new file mode 100644
index 00000000000..3192b0bf4fa
--- /dev/null
+++ b/arch/sparc/lib/U1copy_from_user.S
@@ -0,0 +1,33 @@
+/* U1copy_from_user.S: UltraSparc-I/II/IIi/IIe optimized copy from userspace.
+ *
+ * Copyright (C) 1999, 2000, 2004 David S. Miller (davem@redhat.com)
+ */
+
+#define EX_LD(x) \
+98: x; \
+ .section .fixup; \
+ .align 4; \
+99: retl; \
+ mov 1, %o0; \
+ .section __ex_table,"a";\
+ .align 4; \
+ .word 98b, 99b; \
+ .text; \
+ .align 4;
+
+#define FUNC_NAME ___copy_from_user
+#define LOAD(type,addr,dest) type##a [addr] %asi, dest
+#define LOAD_BLK(addr,dest) ldda [addr] ASI_BLK_AIUS, dest
+#define EX_RETVAL(x) 0
+
+ /* 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; \
+
+#include "U1memcpy.S"