1/* 2 * linux/arch/arm/lib/putuser.S 3 * 4 * Copyright (C) 2001 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 * Idea from x86 version, (C) Copyright 1998 Linus Torvalds 11 * 12 * These functions have a non-standard call interface to make 13 * them more efficient, especially as they return an error 14 * value in addition to the "real" return value. 15 * 16 * __put_user_X 17 * 18 * Inputs: r0 contains the address 19 * r2, r3 contains the value 20 * Outputs: r0 is the error code 21 * lr corrupted 22 * 23 * No other registers must be altered. (see <asm/uaccess.h> 24 * for specific ASM register usage). 25 * 26 * Note that ADDR_LIMIT is either 0 or 0xc0000000 27 * Note also that it is intended that __put_user_bad is not global. 28 */ 29#include <linux/linkage.h> 30#include <asm/errno.h> 31 32ENTRY(__put_user_1) 331: strbt r2, [r0] 34 mov r0, #0 35 mov pc, lr 36ENDPROC(__put_user_1) 37 38ENTRY(__put_user_2) 39 mov ip, r2, lsr #8 40#ifdef CONFIG_THUMB2_KERNEL 41#ifndef __ARMEB__ 422: strbt r2, [r0] 433: strbt ip, [r0, #1] 44#else 452: strbt ip, [r0] 463: strbt r2, [r0, #1] 47#endif 48#else /* !CONFIG_THUMB2_KERNEL */ 49#ifndef __ARMEB__ 502: strbt r2, [r0], #1 513: strbt ip, [r0] 52#else 532: strbt ip, [r0], #1 543: strbt r2, [r0] 55#endif 56#endif /* CONFIG_THUMB2_KERNEL */ 57 mov r0, #0 58 mov pc, lr 59ENDPROC(__put_user_2) 60 61ENTRY(__put_user_4) 624: strt r2, [r0] 63 mov r0, #0 64 mov pc, lr 65ENDPROC(__put_user_4) 66 67ENTRY(__put_user_8) 68#ifdef CONFIG_THUMB2_KERNEL 695: strt r2, [r0] 706: strt r3, [r0, #4] 71#else 725: strt r2, [r0], #4 736: strt r3, [r0] 74#endif 75 mov r0, #0 76 mov pc, lr 77ENDPROC(__put_user_8) 78 79__put_user_bad: 80 mov r0, #-EFAULT 81 mov pc, lr 82ENDPROC(__put_user_bad) 83 84.section __ex_table, "a" 85 .long 1b, __put_user_bad 86 .long 2b, __put_user_bad 87 .long 3b, __put_user_bad 88 .long 4b, __put_user_bad 89 .long 5b, __put_user_bad 90 .long 6b, __put_user_bad 91.previous 92