1 files changed, 104 insertions, 0 deletions

diff --git a/arch/arm/lib/csumpartialcopyuser.S b/arch/arm/lib/csumpartialcopyuser.S
new file mode 100644
index 000000000000..46a2dc962e9d
--- /dev/null
+++ b/arch/arm/lib/csumpartialcopyuser.S
@@ -0,0 +1,104 @@
+/*
+ *  linux/arch/arm/lib/csumpartialcopyuser.S
+ *
+ *  Copyright (C) 1995-1998 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 27/03/03 Ian Molton Clean up CONFIG_CPU
+ *
+ */
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <asm/errno.h>
+#include <asm/constants.h>
+
+                .text
+
+                .macro  save_regs
+                stmfd   sp!, {r1 - r2, r4 - r8, fp, ip, lr, pc}
+                .endm
+
+                .macro  load_regs,flags
+                ldm\flags       fp, {r1, r2, r4-r8, fp, sp, pc}
+                .endm
+
+                .macro  load1b, reg1
+9999:           ldrbt   \reg1, [r0], $1
+                .section __ex_table, "a"
+                .align  3
+                .long   9999b, 6001f
+                .previous
+                .endm
+
+                .macro  load2b, reg1, reg2
+9999:           ldrbt   \reg1, [r0], $1
+9998:           ldrbt   \reg2, [r0], $1
+                .section __ex_table, "a"
+                .long   9999b, 6001f
+                .long   9998b, 6001f
+                .previous
+                .endm
+
+                .macro  load1l, reg1
+9999:           ldrt    \reg1, [r0], $4
+                .section __ex_table, "a"
+                .align  3
+                .long   9999b, 6001f
+                .previous
+                .endm
+
+                .macro  load2l, reg1, reg2
+9999:           ldrt    \reg1, [r0], $4
+9998:           ldrt    \reg2, [r0], $4
+                .section __ex_table, "a"
+                .long   9999b, 6001f
+                .long   9998b, 6001f
+                .previous
+                .endm
+
+                .macro  load4l, reg1, reg2, reg3, reg4
+9999:           ldrt    \reg1, [r0], $4
+9998:           ldrt    \reg2, [r0], $4
+9997:           ldrt    \reg3, [r0], $4
+9996:           ldrt    \reg4, [r0], $4
+                .section __ex_table, "a"
+                .long   9999b, 6001f
+                .long   9998b, 6001f
+                .long   9997b, 6001f
+                .long   9996b, 6001f
+                .previous
+                .endm
+
+/*
+ * unsigned int
+ * csum_partial_copy_from_user(const char *src, char *dst, int len, int sum, int *err_ptr)
+ *  r0 = src, r1 = dst, r2 = len, r3 = sum, [sp] = *err_ptr
+ *  Returns : r0 = checksum, [[sp, #0], #0] = 0 or -EFAULT
+ */
+
+#define FN_ENTRY        ENTRY(csum_partial_copy_from_user)
+
+#include "csumpartialcopygeneric.S"
+
+/*
+ * FIXME: minor buglet here
+ * We don't return the checksum for the data present in the buffer.  To do
+ * so properly, we would have to add in whatever registers were loaded before
+ * the fault, which, with the current asm above is not predictable.
+ */
+                .section .fixup,"ax"
+                .align  4
+6001:           mov     r4, #-EFAULT
+                ldr     r5, [fp, #4]            @ *err_ptr
+                str     r4, [r5]
+                ldmia   sp, {r1, r2}            @ retrieve dst, len
+                add     r2, r2, r1
+                mov     r0, #0                  @ zero the buffer
+6002:           teq     r2, r1
+                strneb  r0, [r1], #1
+                bne     6002b
+                load_regs       ea
+                .previous