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| /* SPDX-License-Identifier: GPL-2.0-only */
| /*
| * linux/arch/arm/lib/getuser.S
| *
| * Copyright (C) 2001 Russell King
| *
| * Idea from x86 version, (C) Copyright 1998 Linus Torvalds
| *
| * These functions have a non-standard call interface to make them more
| * efficient, especially as they return an error value in addition to
| * the "real" return value.
| *
| * __get_user_X
| *
| * Inputs: r0 contains the address
| * r1 contains the address limit, which must be preserved
| * Outputs: r0 is the error code
| * r2, r3 contains the zero-extended value
| * lr corrupted
| *
| * No other registers must be altered. (see <asm/uaccess.h>
| * for specific ASM register usage).
| *
| * Note that ADDR_LIMIT is either 0 or 0xc0000000.
| * Note also that it is intended that __get_user_bad is not global.
| */
| #include <linux/linkage.h>
| #include <asm/assembler.h>
| #include <asm/errno.h>
| #include <asm/domain.h>
|
| ENTRY(__get_user_1)
| check_uaccess r0, 1, r1, r2, __get_user_bad
| 1: TUSER(ldrb) r2, [r0]
| mov r0, #0
| ret lr
| ENDPROC(__get_user_1)
| _ASM_NOKPROBE(__get_user_1)
|
| ENTRY(__get_user_2)
| check_uaccess r0, 2, r1, r2, __get_user_bad
| #if __LINUX_ARM_ARCH__ >= 6
|
| 2: TUSER(ldrh) r2, [r0]
|
| #else
|
| #ifdef CONFIG_CPU_USE_DOMAINS
| rb .req ip
| 2: ldrbt r2, [r0], #1
| 3: ldrbt rb, [r0], #0
| #else
| rb .req r0
| 2: ldrb r2, [r0]
| 3: ldrb rb, [r0, #1]
| #endif
| #ifndef __ARMEB__
| orr r2, r2, rb, lsl #8
| #else
| orr r2, rb, r2, lsl #8
| #endif
|
| #endif /* __LINUX_ARM_ARCH__ >= 6 */
|
| mov r0, #0
| ret lr
| ENDPROC(__get_user_2)
| _ASM_NOKPROBE(__get_user_2)
|
| ENTRY(__get_user_4)
| check_uaccess r0, 4, r1, r2, __get_user_bad
| 4: TUSER(ldr) r2, [r0]
| mov r0, #0
| ret lr
| ENDPROC(__get_user_4)
| _ASM_NOKPROBE(__get_user_4)
|
| ENTRY(__get_user_8)
| check_uaccess r0, 8, r1, r2, __get_user_bad8
| #ifdef CONFIG_THUMB2_KERNEL
| 5: TUSER(ldr) r2, [r0]
| 6: TUSER(ldr) r3, [r0, #4]
| #else
| 5: TUSER(ldr) r2, [r0], #4
| 6: TUSER(ldr) r3, [r0]
| #endif
| mov r0, #0
| ret lr
| ENDPROC(__get_user_8)
| _ASM_NOKPROBE(__get_user_8)
|
| #ifdef __ARMEB__
| ENTRY(__get_user_32t_8)
| check_uaccess r0, 8, r1, r2, __get_user_bad
| #ifdef CONFIG_CPU_USE_DOMAINS
| add r0, r0, #4
| 7: ldrt r2, [r0]
| #else
| 7: ldr r2, [r0, #4]
| #endif
| mov r0, #0
| ret lr
| ENDPROC(__get_user_32t_8)
| _ASM_NOKPROBE(__get_user_32t_8)
|
| ENTRY(__get_user_64t_1)
| check_uaccess r0, 1, r1, r2, __get_user_bad8
| 8: TUSER(ldrb) r3, [r0]
| mov r0, #0
| ret lr
| ENDPROC(__get_user_64t_1)
| _ASM_NOKPROBE(__get_user_64t_1)
|
| ENTRY(__get_user_64t_2)
| check_uaccess r0, 2, r1, r2, __get_user_bad8
| #ifdef CONFIG_CPU_USE_DOMAINS
| rb .req ip
| 9: ldrbt r3, [r0], #1
| 10: ldrbt rb, [r0], #0
| #else
| rb .req r0
| 9: ldrb r3, [r0]
| 10: ldrb rb, [r0, #1]
| #endif
| orr r3, rb, r3, lsl #8
| mov r0, #0
| ret lr
| ENDPROC(__get_user_64t_2)
| _ASM_NOKPROBE(__get_user_64t_2)
|
| ENTRY(__get_user_64t_4)
| check_uaccess r0, 4, r1, r2, __get_user_bad8
| 11: TUSER(ldr) r3, [r0]
| mov r0, #0
| ret lr
| ENDPROC(__get_user_64t_4)
| _ASM_NOKPROBE(__get_user_64t_4)
| #endif
|
| __get_user_bad8:
| mov r3, #0
| __get_user_bad:
| mov r2, #0
| mov r0, #-EFAULT
| ret lr
| ENDPROC(__get_user_bad)
| ENDPROC(__get_user_bad8)
| _ASM_NOKPROBE(__get_user_bad)
| _ASM_NOKPROBE(__get_user_bad8)
|
| .pushsection __ex_table, "a"
| .long 1b, __get_user_bad
| .long 2b, __get_user_bad
| #if __LINUX_ARM_ARCH__ < 6
| .long 3b, __get_user_bad
| #endif
| .long 4b, __get_user_bad
| .long 5b, __get_user_bad8
| .long 6b, __get_user_bad8
| #ifdef __ARMEB__
| .long 7b, __get_user_bad
| .long 8b, __get_user_bad8
| .long 9b, __get_user_bad8
| .long 10b, __get_user_bad8
| .long 11b, __get_user_bad8
| #endif
| .popsection
|
|
