429 lines
11 KiB
C
429 lines
11 KiB
C
/*
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* Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
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* Copyright (C) 2008-2009 PetaLogix
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* Copyright (C) 2006 Atmark Techno, Inc.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#ifndef _ASM_MICROBLAZE_UACCESS_H
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#define _ASM_MICROBLAZE_UACCESS_H
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#ifdef __KERNEL__
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#ifndef __ASSEMBLY__
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/sched.h> /* RLIMIT_FSIZE */
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#include <linux/mm.h>
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#include <asm/mmu.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <linux/string.h>
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#define VERIFY_READ 0
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#define VERIFY_WRITE 1
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/*
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* On Microblaze the fs value is actually the top of the corresponding
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* address space.
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*
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* The fs value determines whether argument validity checking should be
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* performed or not. If get_fs() == USER_DS, checking is performed, with
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* get_fs() == KERNEL_DS, checking is bypassed.
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*
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* For historical reasons, these macros are grossly misnamed.
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*
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* For non-MMU arch like Microblaze, KERNEL_DS and USER_DS is equal.
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*/
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# define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
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# ifndef CONFIG_MMU
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# define KERNEL_DS MAKE_MM_SEG(0)
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# define USER_DS KERNEL_DS
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# else
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# define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF)
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# define USER_DS MAKE_MM_SEG(TASK_SIZE - 1)
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# endif
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# define get_ds() (KERNEL_DS)
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# define get_fs() (current_thread_info()->addr_limit)
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# define set_fs(val) (current_thread_info()->addr_limit = (val))
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# define segment_eq(a, b) ((a).seg == (b).seg)
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/*
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* The exception table consists of pairs of addresses: the first is the
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* address of an instruction that is allowed to fault, and the second is
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* the address at which the program should continue. No registers are
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* modified, so it is entirely up to the continuation code to figure out
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* what to do.
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*
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* All the routines below use bits of fixup code that are out of line
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* with the main instruction path. This means when everything is well,
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* we don't even have to jump over them. Further, they do not intrude
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* on our cache or tlb entries.
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*/
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struct exception_table_entry {
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unsigned long insn, fixup;
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};
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#ifndef CONFIG_MMU
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/* Check against bounds of physical memory */
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static inline int ___range_ok(unsigned long addr, unsigned long size)
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{
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return ((addr < memory_start) ||
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((addr + size - 1) > (memory_start + memory_size - 1)));
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}
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#define __range_ok(addr, size) \
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___range_ok((unsigned long)(addr), (unsigned long)(size))
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#define access_ok(type, addr, size) (__range_ok((addr), (size)) == 0)
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#else
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static inline int access_ok(int type, const void __user *addr,
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unsigned long size)
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{
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if (!size)
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goto ok;
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if ((get_fs().seg < ((unsigned long)addr)) ||
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(get_fs().seg < ((unsigned long)addr + size - 1))) {
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pr_devel("ACCESS fail: %s at 0x%08x (size 0x%x), seg 0x%08x\n",
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type ? "WRITE" : "READ ", (__force u32)addr, (u32)size,
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(u32)get_fs().seg);
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return 0;
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}
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ok:
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pr_devel("ACCESS OK: %s at 0x%08x (size 0x%x), seg 0x%08x\n",
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type ? "WRITE" : "READ ", (__force u32)addr, (u32)size,
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(u32)get_fs().seg);
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return 1;
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}
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#endif
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#ifdef CONFIG_MMU
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# define __FIXUP_SECTION ".section .fixup,\"ax\"\n"
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# define __EX_TABLE_SECTION ".section __ex_table,\"a\"\n"
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#else
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# define __FIXUP_SECTION ".section .discard,\"ax\"\n"
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# define __EX_TABLE_SECTION ".section .discard,\"ax\"\n"
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#endif
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extern unsigned long __copy_tofrom_user(void __user *to,
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const void __user *from, unsigned long size);
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/* Return: number of not copied bytes, i.e. 0 if OK or non-zero if fail. */
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static inline unsigned long __must_check __clear_user(void __user *to,
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unsigned long n)
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{
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/* normal memset with two words to __ex_table */
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__asm__ __volatile__ ( \
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"1: sb r0, %1, r0;" \
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" addik %0, %0, -1;" \
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" bneid %0, 1b;" \
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" addik %1, %1, 1;" \
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"2: " \
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__EX_TABLE_SECTION \
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".word 1b,2b;" \
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".previous;" \
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: "=r"(n), "=r"(to) \
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: "0"(n), "1"(to)
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);
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return n;
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}
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static inline unsigned long __must_check clear_user(void __user *to,
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unsigned long n)
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{
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might_fault();
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if (unlikely(!access_ok(VERIFY_WRITE, to, n)))
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return n;
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return __clear_user(to, n);
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}
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/* put_user and get_user macros */
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extern long __user_bad(void);
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#define __get_user_asm(insn, __gu_ptr, __gu_val, __gu_err) \
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({ \
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__asm__ __volatile__ ( \
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"1:" insn " %1, %2, r0;" \
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" addk %0, r0, r0;" \
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"2: " \
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__FIXUP_SECTION \
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"3: brid 2b;" \
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" addik %0, r0, %3;" \
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".previous;" \
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__EX_TABLE_SECTION \
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".word 1b,3b;" \
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".previous;" \
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: "=&r"(__gu_err), "=r"(__gu_val) \
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: "r"(__gu_ptr), "i"(-EFAULT) \
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); \
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})
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/**
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* get_user: - Get a simple variable from user space.
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* @x: Variable to store result.
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* @ptr: Source address, in user space.
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*
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* This macro copies a single simple variable from user space to kernel
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* space. It supports simple types like char and int, but not larger
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* data types like structures or arrays.
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*
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* @ptr must have pointer-to-simple-variable type, and the result of
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* dereferencing @ptr must be assignable to @x without a cast.
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*
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* Returns zero on success, or -EFAULT on error.
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* On error, the variable @x is set to zero.
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*/
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#define get_user(x, ptr) \
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__get_user_check((x), (ptr), sizeof(*(ptr)))
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#define __get_user_check(x, ptr, size) \
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({ \
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unsigned long __gu_val = 0; \
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const typeof(*(ptr)) __user *__gu_addr = (ptr); \
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int __gu_err = 0; \
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\
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if (access_ok(VERIFY_READ, __gu_addr, size)) { \
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switch (size) { \
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case 1: \
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__get_user_asm("lbu", __gu_addr, __gu_val, \
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__gu_err); \
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break; \
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case 2: \
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__get_user_asm("lhu", __gu_addr, __gu_val, \
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__gu_err); \
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break; \
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case 4: \
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__get_user_asm("lw", __gu_addr, __gu_val, \
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__gu_err); \
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break; \
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default: \
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__gu_err = __user_bad(); \
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break; \
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} \
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} else { \
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__gu_err = -EFAULT; \
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} \
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x = (__force typeof(*(ptr)))__gu_val; \
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__gu_err; \
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})
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#define __get_user(x, ptr) \
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({ \
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unsigned long __gu_val = 0; \
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/*unsigned long __gu_ptr = (unsigned long)(ptr);*/ \
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long __gu_err; \
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switch (sizeof(*(ptr))) { \
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case 1: \
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__get_user_asm("lbu", (ptr), __gu_val, __gu_err); \
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break; \
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case 2: \
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__get_user_asm("lhu", (ptr), __gu_val, __gu_err); \
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break; \
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case 4: \
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__get_user_asm("lw", (ptr), __gu_val, __gu_err); \
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break; \
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default: \
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/* __gu_val = 0; __gu_err = -EINVAL;*/ __gu_err = __user_bad();\
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} \
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x = (__force __typeof__(*(ptr))) __gu_val; \
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__gu_err; \
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})
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#define __put_user_asm(insn, __gu_ptr, __gu_val, __gu_err) \
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({ \
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__asm__ __volatile__ ( \
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"1:" insn " %1, %2, r0;" \
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" addk %0, r0, r0;" \
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"2: " \
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__FIXUP_SECTION \
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"3: brid 2b;" \
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" addik %0, r0, %3;" \
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".previous;" \
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__EX_TABLE_SECTION \
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".word 1b,3b;" \
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".previous;" \
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: "=&r"(__gu_err) \
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: "r"(__gu_val), "r"(__gu_ptr), "i"(-EFAULT) \
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); \
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})
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#define __put_user_asm_8(__gu_ptr, __gu_val, __gu_err) \
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({ \
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__asm__ __volatile__ (" lwi %0, %1, 0;" \
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"1: swi %0, %2, 0;" \
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" lwi %0, %1, 4;" \
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"2: swi %0, %2, 4;" \
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" addk %0, r0, r0;" \
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"3: " \
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__FIXUP_SECTION \
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"4: brid 3b;" \
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" addik %0, r0, %3;" \
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".previous;" \
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__EX_TABLE_SECTION \
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".word 1b,4b,2b,4b;" \
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".previous;" \
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: "=&r"(__gu_err) \
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: "r"(&__gu_val), "r"(__gu_ptr), "i"(-EFAULT) \
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); \
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})
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/**
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* put_user: - Write a simple value into user space.
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* @x: Value to copy to user space.
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* @ptr: Destination address, in user space.
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*
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* This macro copies a single simple value from kernel space to user
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* space. It supports simple types like char and int, but not larger
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* data types like structures or arrays.
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*
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* @ptr must have pointer-to-simple-variable type, and @x must be assignable
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* to the result of dereferencing @ptr.
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*
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* Returns zero on success, or -EFAULT on error.
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*/
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#define put_user(x, ptr) \
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__put_user_check((x), (ptr), sizeof(*(ptr)))
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#define __put_user_check(x, ptr, size) \
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({ \
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typeof(*(ptr)) volatile __pu_val = x; \
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typeof(*(ptr)) __user *__pu_addr = (ptr); \
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int __pu_err = 0; \
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\
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if (access_ok(VERIFY_WRITE, __pu_addr, size)) { \
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switch (size) { \
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case 1: \
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__put_user_asm("sb", __pu_addr, __pu_val, \
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__pu_err); \
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break; \
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case 2: \
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__put_user_asm("sh", __pu_addr, __pu_val, \
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__pu_err); \
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break; \
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case 4: \
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__put_user_asm("sw", __pu_addr, __pu_val, \
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__pu_err); \
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break; \
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case 8: \
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__put_user_asm_8(__pu_addr, __pu_val, __pu_err);\
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break; \
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default: \
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__pu_err = __user_bad(); \
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break; \
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} \
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} else { \
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__pu_err = -EFAULT; \
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} \
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__pu_err; \
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})
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#define __put_user(x, ptr) \
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({ \
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__typeof__(*(ptr)) volatile __gu_val = (x); \
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long __gu_err = 0; \
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switch (sizeof(__gu_val)) { \
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case 1: \
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__put_user_asm("sb", (ptr), __gu_val, __gu_err); \
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break; \
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case 2: \
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__put_user_asm("sh", (ptr), __gu_val, __gu_err); \
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break; \
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case 4: \
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__put_user_asm("sw", (ptr), __gu_val, __gu_err); \
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break; \
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case 8: \
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__put_user_asm_8((ptr), __gu_val, __gu_err); \
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break; \
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default: \
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/*__gu_err = -EINVAL;*/ __gu_err = __user_bad(); \
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} \
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__gu_err; \
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})
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/* copy_to_from_user */
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#define __copy_from_user(to, from, n) \
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__copy_tofrom_user((__force void __user *)(to), \
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(void __user *)(from), (n))
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#define __copy_from_user_inatomic(to, from, n) \
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__copy_from_user((to), (from), (n))
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static inline long copy_from_user(void *to,
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const void __user *from, unsigned long n)
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{
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unsigned long res = n;
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might_fault();
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if (likely(access_ok(VERIFY_READ, from, n)))
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res = __copy_from_user(to, from, n);
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if (unlikely(res))
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memset(to + (n - res), 0, res);
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return res;
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}
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#define __copy_to_user(to, from, n) \
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__copy_tofrom_user((void __user *)(to), \
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(__force const void __user *)(from), (n))
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#define __copy_to_user_inatomic(to, from, n) __copy_to_user((to), (from), (n))
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static inline long copy_to_user(void __user *to,
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const void *from, unsigned long n)
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{
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might_fault();
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if (access_ok(VERIFY_WRITE, to, n))
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return __copy_to_user(to, from, n);
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return n;
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}
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/*
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* Copy a null terminated string from userspace.
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*/
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extern int __strncpy_user(char *to, const char __user *from, int len);
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#define __strncpy_from_user __strncpy_user
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static inline long
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strncpy_from_user(char *dst, const char __user *src, long count)
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{
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if (!access_ok(VERIFY_READ, src, 1))
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return -EFAULT;
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return __strncpy_from_user(dst, src, count);
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}
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/*
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* Return the size of a string (including the ending 0)
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*
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* Return 0 on exception, a value greater than N if too long
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*/
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extern int __strnlen_user(const char __user *sstr, int len);
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static inline long strnlen_user(const char __user *src, long n)
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{
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if (!access_ok(VERIFY_READ, src, 1))
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return 0;
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return __strnlen_user(src, n);
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}
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#endif /* __ASSEMBLY__ */
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#endif /* __KERNEL__ */
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#endif /* _ASM_MICROBLAZE_UACCESS_H */
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