| /* |
| * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu> |
| * Copyright (C) 2008-2009 PetaLogix |
| * 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 <linux/kernel.h> |
| #include <linux/errno.h> |
| #include <linux/sched.h> /* RLIMIT_FSIZE */ |
| #include <linux/mm.h> |
| |
| #include <asm/mmu.h> |
| #include <asm/page.h> |
| #include <asm/pgtable.h> |
| #include <asm/segment.h> |
| #include <linux/string.h> |
| |
| #define VERIFY_READ 0 |
| #define VERIFY_WRITE 1 |
| |
| #define __clear_user(addr, n) (memset((void *)(addr), 0, (n)), 0) |
| |
| #ifndef CONFIG_MMU |
| |
| 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) |
| |
| /* Undefined function to trigger linker error */ |
| extern int bad_user_access_length(void); |
| |
| /* 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)) |
| |
| /* FIXME is not there defined __pu_val */ |
| #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))) |
| |
| 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 *src, long count); |
| extern long strnlen_user(const char *src, long count); |
| |
| #else /* CONFIG_MMU */ |
| |
| /* |
| * Address is valid if: |
| * - "addr", "addr + size" and "size" are all below the limit |
| */ |
| #define access_ok(type, addr, size) \ |
| (get_fs().seg > (((unsigned long)(addr)) | \ |
| (size) | ((unsigned long)(addr) + (size)))) |
| |
| /* || printk("access_ok failed for %s at 0x%08lx (size %d), seg 0x%08x\n", |
| type?"WRITE":"READ",addr,size,get_fs().seg)) */ |
| |
| /* |
| * All the __XXX versions macros/functions below do not perform |
| * access checking. It is assumed that the necessary checks have been |
| * already performed before the finction (macro) is called. |
| */ |
| |
| #define get_user(x, ptr) \ |
| ({ \ |
| access_ok(VERIFY_READ, (ptr), sizeof(*(ptr))) \ |
| ? __get_user((x), (ptr)) : -EFAULT; \ |
| }) |
| |
| #define put_user(x, ptr) \ |
| ({ \ |
| access_ok(VERIFY_WRITE, (ptr), sizeof(*(ptr))) \ |
| ? __put_user((x), (ptr)) : -EFAULT; \ |
| }) |
| |
| #define __get_user(x, ptr) \ |
| ({ \ |
| unsigned long __gu_val; \ |
| /*unsigned long __gu_ptr = (unsigned long)(ptr);*/ \ |
| long __gu_err; \ |
| switch (sizeof(*(ptr))) { \ |
| case 1: \ |
| __get_user_asm("lbu", (ptr), __gu_val, __gu_err); \ |
| break; \ |
| case 2: \ |
| __get_user_asm("lhu", (ptr), __gu_val, __gu_err); \ |
| break; \ |
| case 4: \ |
| __get_user_asm("lw", (ptr), __gu_val, __gu_err); \ |
| break; \ |
| default: \ |
| __gu_val = 0; __gu_err = -EINVAL; \ |
| } \ |
| x = (__typeof__(*(ptr))) __gu_val; \ |
| __gu_err; \ |
| }) |
| |
| #define __get_user_asm(insn, __gu_ptr, __gu_val, __gu_err) \ |
| ({ \ |
| __asm__ __volatile__ ( \ |
| "1:" insn " %1, %2, r0; \ |
| addk %0, r0, r0; \ |
| 2: \ |
| .section .fixup,\"ax\"; \ |
| 3: brid 2b; \ |
| addik %0, r0, %3; \ |
| .previous; \ |
| .section __ex_table,\"a\"; \ |
| .word 1b,3b; \ |
| .previous;" \ |
| : "=r"(__gu_err), "=r"(__gu_val) \ |
| : "r"(__gu_ptr), "i"(-EFAULT) \ |
| ); \ |
| }) |
| |
| #define __put_user(x, ptr) \ |
| ({ \ |
| __typeof__(*(ptr)) volatile __gu_val = (x); \ |
| long __gu_err = 0; \ |
| switch (sizeof(__gu_val)) { \ |
| case 1: \ |
| __put_user_asm("sb", (ptr), __gu_val, __gu_err); \ |
| break; \ |
| case 2: \ |
| __put_user_asm("sh", (ptr), __gu_val, __gu_err); \ |
| break; \ |
| case 4: \ |
| __put_user_asm("sw", (ptr), __gu_val, __gu_err); \ |
| break; \ |
| case 8: \ |
| __put_user_asm_8((ptr), __gu_val, __gu_err); \ |
| break; \ |
| default: \ |
| __gu_err = -EINVAL; \ |
| } \ |
| __gu_err; \ |
| }) |
| |
| #define __put_user_asm_8(__gu_ptr, __gu_val, __gu_err) \ |
| ({ \ |
| __asm__ __volatile__ (" lwi %0, %1, 0; \ |
| 1: swi %0, %2, 0; \ |
| lwi %0, %1, 4; \ |
| 2: swi %0, %2, 4; \ |
| addk %0,r0,r0; \ |
| 3: \ |
| .section .fixup,\"ax\"; \ |
| 4: brid 3b; \ |
| addik %0, r0, %3; \ |
| .previous; \ |
| .section __ex_table,\"a\"; \ |
| .word 1b,4b,2b,4b; \ |
| .previous;" \ |
| : "=&r"(__gu_err) \ |
| : "r"(&__gu_val), \ |
| "r"(__gu_ptr), "i"(-EFAULT) \ |
| ); \ |
| }) |
| |
| #define __put_user_asm(insn, __gu_ptr, __gu_val, __gu_err) \ |
| ({ \ |
| __asm__ __volatile__ ( \ |
| "1:" insn " %1, %2, r0; \ |
| addk %0, r0, r0; \ |
| 2: \ |
| .section .fixup,\"ax\"; \ |
| 3: brid 2b; \ |
| addik %0, r0, %3; \ |
| .previous; \ |
| .section __ex_table,\"a\"; \ |
| .word 1b,3b; \ |
| .previous;" \ |
| : "=r"(__gu_err) \ |
| : "r"(__gu_val), "r"(__gu_ptr), "i"(-EFAULT) \ |
| ); \ |
| }) |
| |
| /* |
| * Return: number of not copied bytes, i.e. 0 if OK or non-zero if fail. |
| */ |
| static inline int clear_user(char *to, int size) |
| { |
| if (size && access_ok(VERIFY_WRITE, to, size)) { |
| __asm__ __volatile__ (" \ |
| 1: \ |
| sb r0, %2, r0; \ |
| addik %0, %0, -1; \ |
| bneid %0, 1b; \ |
| addik %2, %2, 1; \ |
| 2: \ |
| .section __ex_table,\"a\"; \ |
| .word 1b,2b; \ |
| .section .text;" \ |
| : "=r"(size) \ |
| : "0"(size), "r"(to) |
| ); |
| } |
| return size; |
| } |
| |
| extern unsigned long __copy_tofrom_user(void __user *to, |
| const void __user *from, unsigned long size); |
| |
| #define copy_to_user(to, from, n) \ |
| (access_ok(VERIFY_WRITE, (to), (n)) ? \ |
| __copy_tofrom_user((void __user *)(to), \ |
| (__force const void __user *)(from), (n)) \ |
| : -EFAULT) |
| |
| #define __copy_to_user(to, from, n) copy_to_user((to), (from), (n)) |
| #define __copy_to_user_inatomic(to, from, n) copy_to_user((to), (from), (n)) |
| |
| #define copy_from_user(to, from, n) \ |
| (access_ok(VERIFY_READ, (from), (n)) ? \ |
| __copy_tofrom_user((__force void __user *)(to), \ |
| (void __user *)(from), (n)) \ |
| : -EFAULT) |
| |
| #define __copy_from_user(to, from, n) copy_from_user((to), (from), (n)) |
| #define __copy_from_user_inatomic(to, from, n) \ |
| copy_from_user((to), (from), (n)) |
| |
| extern int __strncpy_user(char *to, const char __user *from, int len); |
| extern int __strnlen_user(const char __user *sstr, int len); |
| |
| #define strncpy_from_user(to, from, len) \ |
| (access_ok(VERIFY_READ, from, 1) ? \ |
| __strncpy_user(to, from, len) : -EFAULT) |
| #define strnlen_user(str, len) \ |
| (access_ok(VERIFY_READ, str, 1) ? __strnlen_user(str, len) : 0) |
| |
| #endif /* CONFIG_MMU */ |
| |
| /* |
| * 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 */ |