[linux-2.6-block.git] / arch / arm / lib / csumpartialcopyuser.S

/*
 *  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/asm-offsets.h>

		.text

#ifdef CONFIG_CPU_SW_DOMAIN_PAN
		.macro	save_regs
		mrc	p15, 0, ip, c3, c0, 0
		stmfd	sp!, {r1, r2, r4 - r8, ip, lr}
		uaccess_enable ip
		.endm

		.macro	load_regs
		ldmfd	sp!, {r1, r2, r4 - r8, ip, lr}
		mcr	p15, 0, ip, c3, c0, 0
		ret	lr
		.endm
#else
		.macro	save_regs
		stmfd	sp!, {r1, r2, r4 - r8, lr}
		.endm

		.macro	load_regs
		ldmfd	sp!, {r1, r2, r4 - r8, pc}
		.endm
#endif

		.macro	load1b,	reg1
		ldrusr	\reg1, r0, 1
		.endm

		.macro	load2b, reg1, reg2
		ldrusr	\reg1, r0, 1
		ldrusr	\reg2, r0, 1
		.endm

		.macro	load1l, reg1
		ldrusr	\reg1, r0, 4
		.endm

		.macro	load2l, reg1, reg2
		ldrusr	\reg1, r0, 4
		ldrusr	\reg2, r0, 4
		.endm

		.macro	load4l, reg1, reg2, reg3, reg4
		ldrusr	\reg1, r0, 4
		ldrusr	\reg2, r0, 4
		ldrusr	\reg3, r0, 4
		ldrusr	\reg4, r0, 4
		.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)
#define FN_EXIT		ENDPROC(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.
 */
		.pushsection .text.fixup,"ax"
		.align	4
9001:		mov	r4, #-EFAULT
#ifdef CONFIG_CPU_SW_DOMAIN_PAN
		ldr	r5, [sp, #9*4]		@ *err_ptr
#else
		ldr	r5, [sp, #8*4]		@ *err_ptr
#endif
		str	r4, [r5]
		ldmia	sp, {r1, r2}		@ retrieve dst, len
		add	r2, r2, r1
		mov	r0, #0			@ zero the buffer
9002:		teq	r2, r1
		strbne	r0, [r1], #1
		bne	9002b
		load_regs
		.popsection
Commit	Line	Data
1da177e4 LT	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>
e6ae744d	16	#include <asm/asm-offsets.h>
1da177e4 LT	17
	18	.text
	19
a5e090ac RK	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
1da177e4	33	.macro save_regs
22acc4e6	34	stmfd sp!, {r1, r2, r4 - r8, lr}
1da177e4 LT	35	.endm
1da177e4 LT	36
90303b10	37	.macro load_regs
22acc4e6	38	ldmfd sp!, {r1, r2, r4 - r8, pc}
1da177e4	39	.endm
a5e090ac	40	#endif
1da177e4 LT	41
1da177e4 LT	42	.macro load1b, reg1
8b592783	43	ldrusr \reg1, r0, 1
1da177e4 LT	44	.endm
	45
	46	.macro load2b, reg1, reg2
8b592783 CM	47	ldrusr \reg1, r0, 1
8b592783 CM	48	ldrusr \reg2, r0, 1
1da177e4 LT	49	.endm
	50
	51	.macro load1l, reg1
8b592783	52	ldrusr \reg1, r0, 4
1da177e4 LT	53	.endm
	54
	55	.macro load2l, reg1, reg2
8b592783 CM	56	ldrusr \reg1, r0, 4
8b592783 CM	57	ldrusr \reg2, r0, 4
1da177e4 LT	58	.endm
	59
	60	.macro load4l, reg1, reg2, reg3, reg4
8b592783 CM	61	ldrusr \reg1, r0, 4
	62	ldrusr \reg2, r0, 4
	63	ldrusr \reg3, r0, 4
	64	ldrusr \reg4, r0, 4
1da177e4 LT	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)
93ed3970	75	#define FN_EXIT ENDPROC(csum_partial_copy_from_user)
1da177e4 LT	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	*/
c4a84ae3	85	.pushsection .text.fixup,"ax"
1da177e4	86	.align 4
8b592783	87	9001: mov r4, #-EFAULT
36b0cb84 CZ	88	#ifdef CONFIG_CPU_SW_DOMAIN_PAN
	89	ldr r5, [sp, #94] @ err_ptr
	90	#else
4609a179	91	ldr r5, [sp, #84] @ err_ptr
36b0cb84	92	#endif
1da177e4 LT	93	str r4, [r5]
	94	ldmia sp, {r1, r2} @ retrieve dst, len
	95	add r2, r2, r1
	96	mov r0, #0 @ zero the buffer
8b592783	97	9002: teq r2, r1
e44fc388	98	strbne r0, [r1], #1
8b592783	99	bne 9002b
90303b10	100	load_regs
4260415f	101	.popsection