summaryrefslogtreecommitdiffstats
path: root/arch/sparc/lib/GENpatch.S
diff options
context:
space:
mode:
Diffstat (limited to 'arch/sparc/lib/GENpatch.S')
-rw-r--r--arch/sparc/lib/GENpatch.S34
1 files changed, 34 insertions, 0 deletions
diff --git a/arch/sparc/lib/GENpatch.S b/arch/sparc/lib/GENpatch.S
new file mode 100644
index 0000000000..1ec1f02c8b
--- /dev/null
+++ b/arch/sparc/lib/GENpatch.S
@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* GENpatch.S: Patch Ultra-I routines with generic variant.
+ *
+ * Copyright (C) 2007 David S. Miller <davem@davemloft.net>
+ */
+
+#define BRANCH_ALWAYS 0x10680000
+#define NOP 0x01000000
+#define GEN_DO_PATCH(OLD, NEW) \
+ sethi %hi(NEW), %g1; \
+ or %g1, %lo(NEW), %g1; \
+ sethi %hi(OLD), %g2; \
+ or %g2, %lo(OLD), %g2; \
+ sub %g1, %g2, %g1; \
+ sethi %hi(BRANCH_ALWAYS), %g3; \
+ sll %g1, 11, %g1; \
+ srl %g1, 11 + 2, %g1; \
+ or %g3, %lo(BRANCH_ALWAYS), %g3; \
+ or %g3, %g1, %g3; \
+ stw %g3, [%g2]; \
+ sethi %hi(NOP), %g3; \
+ or %g3, %lo(NOP), %g3; \
+ stw %g3, [%g2 + 0x4]; \
+ flush %g2;
+
+ .globl generic_patch_copyops
+ .type generic_patch_copyops,#function
+generic_patch_copyops:
+ GEN_DO_PATCH(memcpy, GENmemcpy)
+ GEN_DO_PATCH(raw_copy_from_user, GENcopy_from_user)
+ GEN_DO_PATCH(raw_copy_to_user, GENcopy_to_user)
+ retl
+ nop
+ .size generic_patch_copyops,.-generic_patch_copyops