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| /*
| * 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
| strneb r0, [r1], #1
| bne 9002b
| load_regs
| .popsection
|
|
