From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001
From: Linus Torvalds <torvalds@ppc970.osdl.org>
Date: Sat, 16 Apr 2005 15:20:36 -0700
Subject: Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
---
 arch/arm26/lib/csumpartialcopyuser.S | 115 +++++++++++++++++++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 arch/arm26/lib/csumpartialcopyuser.S

(limited to 'arch/arm26/lib/csumpartialcopyuser.S')

diff --git a/arch/arm26/lib/csumpartialcopyuser.S b/arch/arm26/lib/csumpartialcopyuser.S
new file mode 100644
index 00000000000..5b821188e47
--- /dev/null
+++ b/arch/arm26/lib/csumpartialcopyuser.S
@@ -0,0 +1,115 @@
+/*
+ *  linux/arch/arm26/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.
+ */
+#include <linux/config.h>
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <asm/errno.h>
+#include <asm/asm_offsets.h>
+
+		.text
+
+		.macro	save_regs
+		stmfd	sp!, {r1 - r2, r4 - r9, fp, ip, lr, pc}
+		mov	r9, sp, lsr #13
+		mov	r9, r9, lsl #13
+		ldr	r9, [r9, #TSK_ADDR_LIMIT]
+		mov	r9, r9, lsr #24
+		.endm
+
+		.macro	load_regs,flags
+		ldm\flags	fp, {r1, r2, r4-r9, fp, sp, pc}^
+		.endm
+
+		.macro	load1b,	reg1
+		tst	r9, #0x01
+9999:		ldreqbt	\reg1, [r0], #1
+		ldrneb	\reg1, [r0], #1
+		.section __ex_table, "a"
+		.align	3
+		.long	9999b, 6001f
+		.previous
+		.endm
+
+		.macro	load2b, reg1, reg2
+		tst	r9, #0x01
+9999:		ldreqbt	\reg1, [r0], #1
+		ldrneb	\reg1, [r0], #1
+9998:		ldreqbt	\reg2, [r0], #1
+		ldrneb	\reg2, [r0], #1
+		.section __ex_table, "a"
+		.long	9999b, 6001f
+		.long	9998b, 6001f
+		.previous
+		.endm
+
+		.macro	load1l, reg1
+		tst	r9, #0x01
+9999:		ldreqt	\reg1, [r0], #4
+		ldrne	\reg1, [r0], #4
+		.section __ex_table, "a"
+		.align	3
+		.long	9999b, 6001f
+		.previous
+		.endm
+
+		.macro	load2l, reg1, reg2
+		tst	r9, #0x01
+		ldmneia	r0!, {\reg1, \reg2}
+9999:		ldreqt	\reg1, [r0], #4
+9998:		ldreqt	\reg2, [r0], #4
+		.section __ex_table, "a"
+		.long	9999b, 6001f
+		.long	9998b, 6001f
+		.previous
+		.endm
+
+		.macro	load4l, reg1, reg2, reg3, reg4
+		tst	r9, #0x01
+		ldmneia	r0!, {\reg1, \reg2, \reg3, \reg4}
+9999:		ldreqt	\reg1, [r0], #4
+9998:		ldreqt	\reg2, [r0], #4
+9997:		ldreqt	\reg3, [r0], #4
+9996:		ldreqt	\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.
+ */
+		.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
-- 
cgit v1.2.3