11da177e4SLinus Torvalds/* 21da177e4SLinus Torvalds * linux/arch/arm/lib/putuser.S 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Copyright (C) 2001 Russell King 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or modify 71da177e4SLinus Torvalds * it under the terms of the GNU General Public License version 2 as 81da177e4SLinus Torvalds * published by the Free Software Foundation. 91da177e4SLinus Torvalds * 101da177e4SLinus Torvalds * Idea from x86 version, (C) Copyright 1998 Linus Torvalds 111da177e4SLinus Torvalds * 121da177e4SLinus Torvalds * These functions have a non-standard call interface to make 131da177e4SLinus Torvalds * them more efficient, especially as they return an error 141da177e4SLinus Torvalds * value in addition to the "real" return value. 151da177e4SLinus Torvalds * 161da177e4SLinus Torvalds * __put_user_X 171da177e4SLinus Torvalds * 181da177e4SLinus Torvalds * Inputs: r0 contains the address 191da177e4SLinus Torvalds * r2, r3 contains the value 201da177e4SLinus Torvalds * Outputs: r0 is the error code 211da177e4SLinus Torvalds * lr corrupted 221da177e4SLinus Torvalds * 234baa9922SRussell King * No other registers must be altered. (see <asm/uaccess.h> 241da177e4SLinus Torvalds * for specific ASM register usage). 251da177e4SLinus Torvalds * 261da177e4SLinus Torvalds * Note that ADDR_LIMIT is either 0 or 0xc0000000 271da177e4SLinus Torvalds * Note also that it is intended that __put_user_bad is not global. 281da177e4SLinus Torvalds */ 29*93ed3970SCatalin Marinas#include <linux/linkage.h> 301da177e4SLinus Torvalds#include <asm/errno.h> 311da177e4SLinus Torvalds 32*93ed3970SCatalin MarinasENTRY(__put_user_1) 331da177e4SLinus Torvalds1: strbt r2, [r0] 341da177e4SLinus Torvalds mov r0, #0 351da177e4SLinus Torvalds mov pc, lr 36*93ed3970SCatalin MarinasENDPROC(__put_user_1) 371da177e4SLinus Torvalds 38*93ed3970SCatalin MarinasENTRY(__put_user_2) 391da177e4SLinus Torvalds mov ip, r2, lsr #8 401da177e4SLinus Torvalds#ifndef __ARMEB__ 411da177e4SLinus Torvalds2: strbt r2, [r0], #1 421da177e4SLinus Torvalds3: strbt ip, [r0] 431da177e4SLinus Torvalds#else 441da177e4SLinus Torvalds2: strbt ip, [r0], #1 451da177e4SLinus Torvalds3: strbt r2, [r0] 461da177e4SLinus Torvalds#endif 471da177e4SLinus Torvalds mov r0, #0 481da177e4SLinus Torvalds mov pc, lr 49*93ed3970SCatalin MarinasENDPROC(__put_user_2) 501da177e4SLinus Torvalds 51*93ed3970SCatalin MarinasENTRY(__put_user_4) 521da177e4SLinus Torvalds4: strt r2, [r0] 531da177e4SLinus Torvalds mov r0, #0 541da177e4SLinus Torvalds mov pc, lr 55*93ed3970SCatalin MarinasENDPROC(__put_user_4) 561da177e4SLinus Torvalds 57*93ed3970SCatalin MarinasENTRY(__put_user_8) 581da177e4SLinus Torvalds5: strt r2, [r0], #4 591da177e4SLinus Torvalds6: strt r3, [r0] 601da177e4SLinus Torvalds mov r0, #0 611da177e4SLinus Torvalds mov pc, lr 62*93ed3970SCatalin MarinasENDPROC(__put_user_8) 631da177e4SLinus Torvalds 641da177e4SLinus Torvalds__put_user_bad: 651da177e4SLinus Torvalds mov r0, #-EFAULT 661da177e4SLinus Torvalds mov pc, lr 67*93ed3970SCatalin MarinasENDPROC(__put_user_bad) 681da177e4SLinus Torvalds 691da177e4SLinus Torvalds.section __ex_table, "a" 701da177e4SLinus Torvalds .long 1b, __put_user_bad 711da177e4SLinus Torvalds .long 2b, __put_user_bad 721da177e4SLinus Torvalds .long 3b, __put_user_bad 731da177e4SLinus Torvalds .long 4b, __put_user_bad 741da177e4SLinus Torvalds .long 5b, __put_user_bad 751da177e4SLinus Torvalds .long 6b, __put_user_bad 761da177e4SLinus Torvalds.previous 77