98 строки
2.0 KiB
ArmAsm
98 строки
2.0 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* linux/arch/arm/lib/csumpartialcopyuser.S
|
|
*
|
|
* Copyright (C) 1995-1998 Russell King
|
|
*
|
|
* 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
|