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Diffstat (limited to 'include/asm-sh64/uaccess.h')
| -rw-r--r-- | include/asm-sh64/uaccess.h | 327 |
1 files changed, 327 insertions, 0 deletions
diff --git a/include/asm-sh64/uaccess.h b/include/asm-sh64/uaccess.h new file mode 100644 index 000000000000..a33654d576a1 --- /dev/null +++ b/include/asm-sh64/uaccess.h @@ -0,0 +1,327 @@ +#ifndef __ASM_SH64_UACCESS_H +#define __ASM_SH64_UACCESS_H + +/* + * 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/asm-sh64/uaccess.h + * + * Copyright (C) 2000, 2001 Paolo Alberelli + * Copyright (C) 2003, 2004 Paul Mundt + * + * User space memory access functions + * + * Copyright (C) 1999 Niibe Yutaka + * + * Based on: + * MIPS implementation version 1.15 by + * Copyright (C) 1996, 1997, 1998 by Ralf Baechle + * and i386 version. + * + */ + +#include <linux/errno.h> +#include <linux/sched.h> + +#define VERIFY_READ 0 +#define VERIFY_WRITE 1 + +/* + * The fs value determines whether argument validity checking should be + * performed or not. If get_fs() == USER_DS, checking is performed, with + * get_fs() == KERNEL_DS, checking is bypassed. + * + * For historical reasons (Data Segment Register?), these macros are misnamed. + */ + +#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) }) + +#define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF) +#define USER_DS MAKE_MM_SEG(0x80000000) + +#define get_ds() (KERNEL_DS) +#define get_fs() (current_thread_info()->addr_limit) +#define set_fs(x) (current_thread_info()->addr_limit=(x)) + +#define segment_eq(a,b) ((a).seg == (b).seg) + +#define __addr_ok(addr) ((unsigned long)(addr) < (current_thread_info()->addr_limit.seg)) + +/* + * Uhhuh, this needs 33-bit arithmetic. We have a carry.. + * + * sum := addr + size; carry? --> flag = true; + * if (sum >= addr_limit) flag = true; + */ +#define __range_ok(addr,size) (((unsigned long) (addr) + (size) < (current_thread_info()->addr_limit.seg)) ? 0 : 1) + +#define access_ok(type,addr,size) (__range_ok(addr,size) == 0) +#define __access_ok(addr,size) (__range_ok(addr,size) == 0) + +/* this function will go away soon - use access_ok() instead */ +extern inline int __deprecated verify_area(int type, const void __user * addr, unsigned long size) +{ + return access_ok(type,addr,size) ? 0 : -EFAULT; +} + +/* + * Uh, these should become the main single-value transfer routines ... + * They automatically use the right size if we just have the right + * pointer type ... + * + * As MIPS uses the same address space for kernel and user data, we + * can just do these as direct assignments. + * + * Careful to not + * (a) re-use the arguments for side effects (sizeof is ok) + * (b) require any knowledge of processes at this stage + */ +#define put_user(x,ptr) __put_user_check((x),(ptr),sizeof(*(ptr))) +#define get_user(x,ptr) __get_user_check((x),(ptr),sizeof(*(ptr))) + +/* + * The "__xxx" versions do not do address space checking, useful when + * doing multiple accesses to the same area (the user has to do the + * checks by hand with "access_ok()") + */ +#define __put_user(x,ptr) __put_user_nocheck((x),(ptr),sizeof(*(ptr))) +#define __get_user(x,ptr) __get_user_nocheck((x),(ptr),sizeof(*(ptr))) + +/* + * The "xxx_ret" versions return constant specified in third argument, if + * something bad happens. These macros can be optimized for the + * case of just returning from the function xxx_ret is used. + */ + +#define put_user_ret(x,ptr,ret) ({ \ +if (put_user(x,ptr)) return ret; }) + +#define get_user_ret(x,ptr,ret) ({ \ +if (get_user(x,ptr)) return ret; }) + +#define __put_user_ret(x,ptr,ret) ({ \ +if (__put_user(x,ptr)) return ret; }) + +#define __get_user_ret(x,ptr,ret) ({ \ +if (__get_user(x,ptr)) return ret; }) + +struct __large_struct { unsigned long buf[100]; }; +#define __m(x) (*(struct __large_struct *)(x)) + +#define __get_user_size(x,ptr,size,retval) \ +do { \ + retval = 0; \ + switch (size) { \ + case 1: \ + retval = __get_user_asm_b(x, ptr); \ + break; \ + case 2: \ + retval = __get_user_asm_w(x, ptr); \ + break; \ + case 4: \ + retval = __get_user_asm_l(x, ptr); \ + break; \ + case 8: \ + retval = __get_user_asm_q(x, ptr); \ + break; \ + default: \ + __get_user_unknown(); \ + break; \ + } \ +} while (0) + +#define __get_user_nocheck(x,ptr,size) \ +({ \ + long __gu_addr = (long)(ptr); \ + long __gu_err; \ + __typeof(*(ptr)) __gu_val; \ + __asm__ ("":"=r" (__gu_val)); \ + __asm__ ("":"=r" (__gu_err)); \ + __get_user_size((void *)&__gu_val, __gu_addr, (size), __gu_err); \ + (x) = (__typeof__(*(ptr))) __gu_val; \ + __gu_err; \ +}) + +#define __get_user_check(x,ptr,size) \ +({ \ + long __gu_addr = (long)(ptr); \ + long __gu_err = -EFAULT; \ + __typeof(*(ptr)) __gu_val; \ + __asm__ ("":"=r" (__gu_val)); \ + __asm__ ("":"=r" (__gu_err)); \ + if (__access_ok(__gu_addr, (size))) \ + __get_user_size((void *)&__gu_val, __gu_addr, (size), __gu_err); \ + (x) = (__typeof__(*(ptr))) __gu_val; \ + __gu_err; \ +}) + +extern long __get_user_asm_b(void *, long); +extern long __get_user_asm_w(void *, long); +extern long __get_user_asm_l(void *, long); +extern long __get_user_asm_q(void *, long); +extern void __get_user_unknown(void); + +#define __put_user_size(x,ptr,size,retval) \ +do { \ + retval = 0; \ + switch (size) { \ + case 1: \ + retval = __put_user_asm_b(x, ptr); \ + break; \ + case 2: \ + retval = __put_user_asm_w(x, ptr); \ + break; \ + case 4: \ + retval = __put_user_asm_l(x, ptr); \ + break; \ + case 8: \ + retval = __put_user_asm_q(x, ptr); \ + break; \ + default: \ + __put_user_unknown(); \ + } \ +} while (0) + +#define __put_user_nocheck(x,ptr,size) \ +({ \ + long __pu_err; \ + __typeof__(*(ptr)) __pu_val = (x); \ + __put_user_size((void *)&__pu_val, (long)(ptr), (size), __pu_err); \ + __pu_err; \ +}) + +#define __put_user_check(x,ptr,size) \ +({ \ + long __pu_err = -EFAULT; \ + long __pu_addr = (long)(ptr); \ + __typeof__(*(ptr)) __pu_val = (x); \ + \ + if (__access_ok(__pu_addr, (size))) \ + __put_user_size((void *)&__pu_val, __pu_addr, (size), __pu_err);\ + __pu_err; \ +}) + +extern long __put_user_asm_b(void *, long); +extern long __put_user_asm_w(void *, long); +extern long __put_user_asm_l(void *, long); +extern long __put_user_asm_q(void *, long); +extern void __put_user_unknown(void); + + +/* Generic arbitrary sized copy. */ +/* Return the number of bytes NOT copied */ +/* XXX: should be such that: 4byte and the rest. */ +extern __kernel_size_t __copy_user(void *__to, const void *__from, __kernel_size_t __n); + +#define copy_to_user(to,from,n) ({ \ +void *__copy_to = (void *) (to); \ +__kernel_size_t __copy_size = (__kernel_size_t) (n); \ +__kernel_size_t __copy_res; \ +if(__copy_size && __access_ok((unsigned long)__copy_to, __copy_size)) { \ +__copy_res = __copy_user(__copy_to, (void *) (from), __copy_size); \ +} else __copy_res = __copy_size; \ +__copy_res; }) + +#define copy_to_user_ret(to,from,n,retval) ({ \ +if (copy_to_user(to,from,n)) \ + return retval; \ +}) + +#define __copy_to_user(to,from,n) \ + __copy_user((void *)(to), \ + (void *)(from), n) + +#define __copy_to_user_ret(to,from,n,retval) ({ \ +if (__copy_to_user(to,from,n)) \ + return retval; \ +}) + +#define copy_from_user(to,from,n) ({ \ +void *__copy_to = (void *) (to); \ +void *__copy_from = (void *) (from); \ +__kernel_size_t __copy_size = (__kernel_size_t) (n); \ +__kernel_size_t __copy_res; \ +if(__copy_size && __access_ok((unsigned long)__copy_from, __copy_size)) { \ +__copy_res = __copy_user(__copy_to, __copy_from, __copy_size); \ +} else __copy_res = __copy_size; \ +__copy_res; }) + +#define copy_from_user_ret(to,from,n,retval) ({ \ +if (copy_from_user(to,from,n)) \ + return retval; \ +}) + +#define __copy_from_user(to,from,n) \ + __copy_user((void *)(to), \ + (void *)(from), n) + +#define __copy_from_user_ret(to,from,n,retval) ({ \ +if (__copy_from_user(to,from,n)) \ + return retval; \ +}) + +#define __copy_to_user_inatomic __copy_to_user +#define __copy_from_user_inatomic __copy_from_user + +/* XXX: Not sure it works well.. + should be such that: 4byte clear and the rest. */ +extern __kernel_size_t __clear_user(void *addr, __kernel_size_t size); + +#define clear_user(addr,n) ({ \ +void * __cl_addr = (addr); \ +unsigned long __cl_size = (n); \ +if (__cl_size && __access_ok(((unsigned long)(__cl_addr)), __cl_size)) \ +__cl_size = __clear_user(__cl_addr, __cl_size); \ +__cl_size; }) + +extern int __strncpy_from_user(unsigned long __dest, unsigned long __src, int __count); + +#define strncpy_from_user(dest,src,count) ({ \ +unsigned long __sfu_src = (unsigned long) (src); \ +int __sfu_count = (int) (count); \ +long __sfu_res = -EFAULT; \ +if(__access_ok(__sfu_src, __sfu_count)) { \ +__sfu_res = __strncpy_from_user((unsigned long) (dest), __sfu_src, __sfu_count); \ +} __sfu_res; }) + +#define strlen_user(str) strnlen_user(str, ~0UL >> 1) + +/* + * Return the size of a string (including the ending 0!) + */ +extern long __strnlen_user(const char *__s, long __n); + +extern __inline__ long strnlen_user(const char *s, long n) +{ + if (!__addr_ok(s)) + return 0; + else + return __strnlen_user(s, n); +} + +struct exception_table_entry +{ + unsigned long insn, fixup; +}; + +#define ARCH_HAS_SEARCH_EXTABLE + +/* If gcc inlines memset, it will use st.q instructions. Therefore, we need + kmalloc allocations to be 8-byte aligned. Without this, the alignment + becomes BYTE_PER_WORD i.e. only 4 (since sizeof(long)==sizeof(void*)==4 on + sh64 at the moment). */ +#define ARCH_KMALLOC_MINALIGN 8 + +/* + * We want 8-byte alignment for the slab caches as well, otherwise we have + * the same BYTES_PER_WORD (sizeof(void *)) min align in kmem_cache_create(). + */ +#define ARCH_SLAB_MINALIGN 8 + +/* Returns 0 if exception not found and fixup.unit otherwise. */ +extern unsigned long search_exception_table(unsigned long addr); +extern const struct exception_table_entry *search_exception_tables (unsigned long addr); + +#endif /* __ASM_SH64_UACCESS_H */ |