summaryrefslogtreecommitdiff
path: root/arch/mips/lib/strlen_user.S
diff options
context:
space:
mode:
Diffstat (limited to 'arch/mips/lib/strlen_user.S')
-rw-r--r--arch/mips/lib/strlen_user.S61
1 files changed, 61 insertions, 0 deletions
diff --git a/arch/mips/lib/strlen_user.S b/arch/mips/lib/strlen_user.S
new file mode 100644
index 000000000..929bbacd6
--- /dev/null
+++ b/arch/mips/lib/strlen_user.S
@@ -0,0 +1,61 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1996, 1998, 1999, 2004 by Ralf Baechle
+ * Copyright (C) 1999 Silicon Graphics, Inc.
+ * Copyright (C) 2011 MIPS Technologies, Inc.
+ */
+#include <asm/asm.h>
+#include <asm/asm-offsets.h>
+#include <asm/regdef.h>
+
+#define EX(insn,reg,addr,handler) \
+9: insn reg, addr; \
+ .section __ex_table,"a"; \
+ PTR 9b, handler; \
+ .previous
+
+/*
+ * Return the size of a string (including the ending 0)
+ *
+ * Return 0 for error
+ */
+ .macro __BUILD_STRLEN_ASM func
+LEAF(__strlen_\func\()_asm)
+ LONG_L v0, TI_ADDR_LIMIT($28) # pointer ok?
+ and v0, a0
+ bnez v0, .Lfault\@
+
+ move v0, a0
+.ifeqs "\func", "kernel"
+1: EX(lbu, v1, (v0), .Lfault\@)
+.else
+1: EX(lbue, v1, (v0), .Lfault\@)
+.endif
+ PTR_ADDIU v0, 1
+ bnez v1, 1b
+ PTR_SUBU v0, a0
+ jr ra
+ END(__strlen_\func\()_asm)
+
+.Lfault\@: move v0, zero
+ jr ra
+ .endm
+
+#ifndef CONFIG_EVA
+ /* Set aliases */
+ .global __strlen_user_asm
+ .set __strlen_user_asm, __strlen_kernel_asm
+#endif
+
+__BUILD_STRLEN_ASM kernel
+
+#ifdef CONFIG_EVA
+
+ .set push
+ .set eva
+__BUILD_STRLEN_ASM user
+ .set pop
+#endif