| /* | |
| * linux/arch/arm/lib/putuser.S | |
| * | |
| * Copyright (C) 2001 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. | |
| * | |
| * 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. | |
| * | |
| * __put_user_X | |
| * | |
| * Inputs: r0 contains the address | |
| * r1 contains the address limit, which must be preserved | |
| * r2, r3 contains the value | |
| * Outputs: r0 is the error code | |
| * 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 __put_user_bad is not global. | |
| */ | |
| #include <linux/linkage.h> | |
| #include <asm/assembler.h> | |
| #include <asm/errno.h> | |
| #include <asm/domain.h> | |
| ENTRY(__put_user_1) | |
| check_uaccess r0, 1, r1, ip, __put_user_bad | |
| 1: TUSER(strb) r2, [r0] | |
| mov r0, #0 | |
| ret lr | |
| ENDPROC(__put_user_1) | |
| ENTRY(__put_user_2) | |
| check_uaccess r0, 2, r1, ip, __put_user_bad | |
| mov ip, r2, lsr #8 | |
| #ifdef CONFIG_THUMB2_KERNEL | |
| #ifndef __ARMEB__ | |
| 2: TUSER(strb) r2, [r0] | |
| 3: TUSER(strb) ip, [r0, #1] | |
| #else | |
| 2: TUSER(strb) ip, [r0] | |
| 3: TUSER(strb) r2, [r0, #1] | |
| #endif | |
| #else /* !CONFIG_THUMB2_KERNEL */ | |
| #ifndef __ARMEB__ | |
| 2: TUSER(strb) r2, [r0], #1 | |
| 3: TUSER(strb) ip, [r0] | |
| #else | |
| 2: TUSER(strb) ip, [r0], #1 | |
| 3: TUSER(strb) r2, [r0] | |
| #endif | |
| #endif /* CONFIG_THUMB2_KERNEL */ | |
| mov r0, #0 | |
| ret lr | |
| ENDPROC(__put_user_2) | |
| ENTRY(__put_user_4) | |
| check_uaccess r0, 4, r1, ip, __put_user_bad | |
| 4: TUSER(str) r2, [r0] | |
| mov r0, #0 | |
| ret lr | |
| ENDPROC(__put_user_4) | |
| ENTRY(__put_user_8) | |
| check_uaccess r0, 8, r1, ip, __put_user_bad | |
| #ifdef CONFIG_THUMB2_KERNEL | |
| 5: TUSER(str) r2, [r0] | |
| 6: TUSER(str) r3, [r0, #4] | |
| #else | |
| 5: TUSER(str) r2, [r0], #4 | |
| 6: TUSER(str) r3, [r0] | |
| #endif | |
| mov r0, #0 | |
| ret lr | |
| ENDPROC(__put_user_8) | |
| __put_user_bad: | |
| mov r0, #-EFAULT | |
| ret lr | |
| ENDPROC(__put_user_bad) | |
| .pushsection __ex_table, "a" | |
| .long 1b, __put_user_bad | |
| .long 2b, __put_user_bad | |
| .long 3b, __put_user_bad | |
| .long 4b, __put_user_bad | |
| .long 5b, __put_user_bad | |
| .long 6b, __put_user_bad | |
| .popsection |