1/*
 2 *  linux/arch/arm/lib/csumpartialcopyuser.S
 3 *
 4 *  Copyright (C) 1995-1998 Russell King
 5 *
 6 * This program is free software; you can redistribute it and/or modify
 7 * it under the terms of the GNU General Public License version 2 as
 8 * published by the Free Software Foundation.
 9 *
10 * 27/03/03 Ian Molton Clean up CONFIG_CPU
11 *
12 */
13#include <linux/linkage.h>
14#include <asm/assembler.h>
15#include <asm/errno.h>
16#include <asm/asm-offsets.h>
17
18		.text
19
 
 
 
 
 
 
 
 
 
 
 
 
 
20		.macro	save_regs
21		stmfd	sp!, {r1, r2, r4 - r8, lr}
22		.endm
23
24		.macro	load_regs
25		ldmfd	sp!, {r1, r2, r4 - r8, pc}
26		.endm
 
27
28		.macro	load1b,	reg1
29		ldrusr	\reg1, r0, 1
30		.endm
31
32		.macro	load2b, reg1, reg2
33		ldrusr	\reg1, r0, 1
34		ldrusr	\reg2, r0, 1
35		.endm
36
37		.macro	load1l, reg1
38		ldrusr	\reg1, r0, 4
39		.endm
40
41		.macro	load2l, reg1, reg2
42		ldrusr	\reg1, r0, 4
43		ldrusr	\reg2, r0, 4
44		.endm
45
46		.macro	load4l, reg1, reg2, reg3, reg4
47		ldrusr	\reg1, r0, 4
48		ldrusr	\reg2, r0, 4
49		ldrusr	\reg3, r0, 4
50		ldrusr	\reg4, r0, 4
51		.endm
52
53/*
54 * unsigned int
55 * csum_partial_copy_from_user(const char *src, char *dst, int len, int sum, int *err_ptr)
56 *  r0 = src, r1 = dst, r2 = len, r3 = sum, [sp] = *err_ptr
57 *  Returns : r0 = checksum, [[sp, #0], #0] = 0 or -EFAULT
58 */
59
60#define FN_ENTRY	ENTRY(csum_partial_copy_from_user)
61#define FN_EXIT		ENDPROC(csum_partial_copy_from_user)
62
63#include "csumpartialcopygeneric.S"
64
65/*
66 * FIXME: minor buglet here
67 * We don't return the checksum for the data present in the buffer.  To do
68 * so properly, we would have to add in whatever registers were loaded before
69 * the fault, which, with the current asm above is not predictable.
70 */
71		.pushsection .fixup,"ax"
72		.align	4
739001:		mov	r4, #-EFAULT
 
 
 
74		ldr	r5, [sp, #8*4]		@ *err_ptr
 
75		str	r4, [r5]
76		ldmia	sp, {r1, r2}		@ retrieve dst, len
77		add	r2, r2, r1
78		mov	r0, #0			@ zero the buffer
799002:		teq	r2, r1
80		strneb	r0, [r1], #1
81		bne	9002b
82		load_regs
83		.popsection

  1/*
  2 *  linux/arch/arm/lib/csumpartialcopyuser.S
  3 *
  4 *  Copyright (C) 1995-1998 Russell King
  5 *
  6 * This program is free software; you can redistribute it and/or modify
  7 * it under the terms of the GNU General Public License version 2 as
  8 * published by the Free Software Foundation.
  9 *
 10 * 27/03/03 Ian Molton Clean up CONFIG_CPU
 11 *
 12 */
 13#include <linux/linkage.h>
 14#include <asm/assembler.h>
 15#include <asm/errno.h>
 16#include <asm/asm-offsets.h>
 17
 18		.text
 19
 20#ifdef CONFIG_CPU_SW_DOMAIN_PAN
 21		.macro	save_regs
 22		mrc	p15, 0, ip, c3, c0, 0
 23		stmfd	sp!, {r1, r2, r4 - r8, ip, lr}
 24		uaccess_enable ip
 25		.endm
 26
 27		.macro	load_regs
 28		ldmfd	sp!, {r1, r2, r4 - r8, ip, lr}
 29		mcr	p15, 0, ip, c3, c0, 0
 30		ret	lr
 31		.endm
 32#else
 33		.macro	save_regs
 34		stmfd	sp!, {r1, r2, r4 - r8, lr}
 35		.endm
 36
 37		.macro	load_regs
 38		ldmfd	sp!, {r1, r2, r4 - r8, pc}
 39		.endm
 40#endif
 41
 42		.macro	load1b,	reg1
 43		ldrusr	\reg1, r0, 1
 44		.endm
 45
 46		.macro	load2b, reg1, reg2
 47		ldrusr	\reg1, r0, 1
 48		ldrusr	\reg2, r0, 1
 49		.endm
 50
 51		.macro	load1l, reg1
 52		ldrusr	\reg1, r0, 4
 53		.endm
 54
 55		.macro	load2l, reg1, reg2
 56		ldrusr	\reg1, r0, 4
 57		ldrusr	\reg2, r0, 4
 58		.endm
 59
 60		.macro	load4l, reg1, reg2, reg3, reg4
 61		ldrusr	\reg1, r0, 4
 62		ldrusr	\reg2, r0, 4
 63		ldrusr	\reg3, r0, 4
 64		ldrusr	\reg4, r0, 4
 65		.endm
 66
 67/*
 68 * unsigned int
 69 * csum_partial_copy_from_user(const char *src, char *dst, int len, int sum, int *err_ptr)
 70 *  r0 = src, r1 = dst, r2 = len, r3 = sum, [sp] = *err_ptr
 71 *  Returns : r0 = checksum, [[sp, #0], #0] = 0 or -EFAULT
 72 */
 73
 74#define FN_ENTRY	ENTRY(csum_partial_copy_from_user)
 75#define FN_EXIT		ENDPROC(csum_partial_copy_from_user)
 76
 77#include "csumpartialcopygeneric.S"
 78
 79/*
 80 * FIXME: minor buglet here
 81 * We don't return the checksum for the data present in the buffer.  To do
 82 * so properly, we would have to add in whatever registers were loaded before
 83 * the fault, which, with the current asm above is not predictable.
 84 */
 85		.pushsection .text.fixup,"ax"
 86		.align	4
 879001:		mov	r4, #-EFAULT
 88#ifdef CONFIG_CPU_SW_DOMAIN_PAN
 89		ldr	r5, [sp, #9*4]		@ *err_ptr
 90#else
 91		ldr	r5, [sp, #8*4]		@ *err_ptr
 92#endif
 93		str	r4, [r5]
 94		ldmia	sp, {r1, r2}		@ retrieve dst, len
 95		add	r2, r2, r1
 96		mov	r0, #0			@ zero the buffer
 979002:		teq	r2, r1
 98		strneb	r0, [r1], #1
 99		bne	9002b
100		load_regs
101		.popsection