Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760097AbZCRVtt (ORCPT ); Wed, 18 Mar 2009 17:49:49 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757698AbZCRVnF (ORCPT ); Wed, 18 Mar 2009 17:43:05 -0400 Received: from 178-47-31-89.wifiinternet.cz ([89.31.47.178]:54475 "EHLO monstr.eu" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1757643AbZCRVnB (ORCPT ); Wed, 18 Mar 2009 17:43:01 -0400 From: monstr@monstr.eu To: linux-kernel@vger.kernel.org Cc: john.williams@petalogix.com, Michal Simek Subject: [PATCH 20/57] microblaze_v7: uaccess files Date: Wed, 18 Mar 2009 21:30:47 +0100 Message-Id: <644f08d7f8cd338e606ed703e221914f75588fb5.1237407249.git.monstr@monstr.eu> X-Mailer: git-send-email 1.5.5.1 In-Reply-To: References: <1237408284-8674-1-git-send-email-monstr@monstr.eu> <0168f03c96e9479ede695a9859c8a0691baa8ef3.1237407249.git.monstr@monstr.eu> <4b5aee01d11fc790c7842838ea63a82ee3273003.1237407249.git.monstr@monstr.eu> <5f8b2a60496983f572ef6d3b4e2f986c167a8336.1237407249.git.monstr@monstr.eu> <20fd42a1e8837c7352d35d157aa3393e88152c32.1237407249.git.monstr@monstr.eu> <2f48efc353c11dfdfc7b052bdfe052b71c09ab23.1237407249.git.monstr@monstr.eu> <58cf06c85e07477170677b72ce3437af10476bec.1237407249.git.monstr@monstr.eu> <20227d6f2615060d6560785090513e251cbe2654.1237407249.git.monstr@monstr.eu> <69ef4f976d86c870a97fbe4974c242c74acc477d.1237407249.git.monstr@monstr.eu> <1477ec41e7ba0ec847a064e1f8e422dc2a5dcc9f.1237407249.git.monstr@monstr.eu> <75127eae09c978220d452d92f95763dde24f1d52.1237407249.git.monstr@monstr.eu> In-Reply-To: <0168f03c96e9479ede695a9859c8a0691baa8ef3.1237407249.git.monstr@monstr.eu> References: <0168f03c96e9479ede695a9859c8a0691baa8ef3.1237407249.git.monstr@monstr.eu> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5938 Lines: 206 From: Michal Simek Signed-off-by: Michal Simek --- arch/microblaze/include/asm/uaccess.h | 134 +++++++++++++++++++++++++++++++++ arch/microblaze/lib/uaccess.c | 41 ++++++++++ 2 files changed, 175 insertions(+), 0 deletions(-) create mode 100644 arch/microblaze/include/asm/uaccess.h create mode 100644 arch/microblaze/lib/uaccess.c diff --git a/arch/microblaze/include/asm/uaccess.h b/arch/microblaze/include/asm/uaccess.h new file mode 100644 index 0000000..5a3ffc3 --- /dev/null +++ b/arch/microblaze/include/asm/uaccess.h @@ -0,0 +1,134 @@ +/* + * Copyright (C) 2006 Atmark Techno, Inc. + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#ifndef _ASM_MICROBLAZE_UACCESS_H +#define _ASM_MICROBLAZE_UACCESS_H + +#ifdef __KERNEL__ +#ifndef __ASSEMBLY__ + +#include +#include +#include /* RLIMIT_FSIZE */ +#include + +#include +#include +#include +#include +#include + +#define VERIFY_READ 0 +#define VERIFY_WRITE 1 + +extern int ___range_ok(unsigned long addr, unsigned long size); + +#define __range_ok(addr, size) \ + ___range_ok((unsigned long)(addr), (unsigned long)(size)) + +#define access_ok(type, addr, size) (__range_ok((addr), (size)) == 0) +#define __access_ok(add, size) (__range_ok((addr), (size)) == 0) + +extern inline int bad_user_access_length(void) +{ + return 0; +} +/* FIXME this is function for optimalization -> memcpy */ +#define __get_user(var, ptr) \ + ({ \ + int __gu_err = 0; \ + switch (sizeof(*(ptr))) { \ + case 1: \ + case 2: \ + case 4: \ + (var) = *(ptr); \ + break; \ + case 8: \ + memcpy((void *) &(var), (ptr), 8); \ + break; \ + default: \ + (var) = 0; \ + __gu_err = __get_user_bad(); \ + break; \ + } \ + __gu_err; \ + }) + +#define __get_user_bad() (bad_user_access_length(), (-EFAULT)) + +#define __put_user(var, ptr) \ + ({ \ + int __pu_err = 0; \ + switch (sizeof(*(ptr))) { \ + case 1: \ + case 2: \ + case 4: \ + *(ptr) = (var); \ + break; \ + case 8: { \ + typeof(*(ptr)) __pu_val = var; \ + memcpy(ptr, &__pu_val, sizeof(__pu_val));\ + } \ + break; \ + default: \ + __pu_err = __put_user_bad(); \ + break; \ + } \ + __pu_err; \ + }) + +#define __put_user_bad() (bad_user_access_length(), (-EFAULT)) + +#define put_user(x, ptr) __put_user(x, ptr) +#define get_user(x, ptr) __get_user(x, ptr) + +#define copy_to_user(to, from, n) (memcpy(to, from, n), 0) +#define copy_from_user(to, from, n) (memcpy(to, from, n), 0) + +#define __copy_to_user(to, from, n) (copy_to_user(to, from, n)) +#define __copy_from_user(to, from, n) (copy_from_user(to, from, n)) +#define __copy_to_user_inatomic(to, from, n) (__copy_to_user(to, from, n)) +#define __copy_from_user_inatomic(to, from, n) (__copy_from_user(to, from, n)) + +#define __clear_user(addr, n) (memset((void *)addr, 0, n), 0) + +static inline unsigned long clear_user(void *addr, unsigned long size) +{ + if (access_ok(VERIFY_WRITE, addr, size)) + size = __clear_user(addr, size); + return size; +} + +/* Returns 0 if exception not found and fixup otherwise. */ +extern unsigned long search_exception_table(unsigned long); + + +extern long strncpy_from_user(char *dst, const char __user *src, long count); +extern long strnlen_user(const char __user *src, long count); +extern long __strncpy_from_user(char *dst, const char __user *src, long count); + +/* + * The exception table consists of pairs of addresses: the first is the + * address of an instruction that is allowed to fault, and the second is + * the address at which the program should continue. No registers are + * modified, so it is entirely up to the continuation code to figure out + * what to do. + * + * All the routines below use bits of fixup code that are out of line + * with the main instruction path. This means when everything is well, + * we don't even have to jump over them. Further, they do not intrude + * on our cache or tlb entries. + */ +struct exception_table_entry { + unsigned long insn, fixup; +}; + +#endif /* __ASSEMBLY__ */ +#endif /* __KERNEL__ */ + +#endif /* _ASM_MICROBLAZE_UACCESS_H */ diff --git a/arch/microblaze/lib/uaccess.c b/arch/microblaze/lib/uaccess.c new file mode 100644 index 0000000..8eb9df5 --- /dev/null +++ b/arch/microblaze/lib/uaccess.c @@ -0,0 +1,41 @@ +/* + * Copyright (C) 2006 Atmark Techno, Inc. + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include +#include + +#include + +long strnlen_user(const char __user *src, long count) +{ + return strlen(src) + 1; +} + +#define __do_strncpy_from_user(dst, src, count, res) \ + do { \ + char *tmp; \ + strncpy(dst, src, count); \ + for (tmp = dst; *tmp && count > 0; tmp++, count--) \ + ; \ + res = (tmp - dst); \ + } while (0) + +long __strncpy_from_user(char *dst, const char __user *src, long count) +{ + long res; + __do_strncpy_from_user(dst, src, count, res); + return res; +} + +long strncpy_from_user(char *dst, const char __user *src, long count) +{ + long res = -EFAULT; + if (access_ok(VERIFY_READ, src, 1)) + __do_strncpy_from_user(dst, src, count, res); + return res; +} -- 1.5.5.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/