uaccess.h
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- /*
- * Authors: Bjorn Wesen (bjornw@axis.com)
- * Hans-Peter Nilsson (hp@axis.com)
- *
- * $Log: uaccess.h,v $
- * Revision 1.8 2001/10/29 13:01:48 bjornw
- * Removed unused variable tmp2 in strnlen_user
- *
- * Revision 1.7 2001/10/02 12:44:52 hp
- * Add support for 64-bit put_user/get_user
- *
- * Revision 1.6 2001/10/01 14:51:17 bjornw
- * Added register prefixes and removed underscores
- *
- * Revision 1.5 2000/10/25 03:33:21 hp
- * - Provide implementation for everything else but get_user and put_user;
- * copying inline to/from user for constant length 0..16, 20, 24, and
- * clearing for 0..4, 8, 12, 16, 20, 24, strncpy_from_user and strnlen_user
- * always inline.
- * - Constraints for destination addr in get_user cannot be memory, only reg.
- * - Correct labels for PC at expected fault points.
- * - Nits with assembly code.
- * - Don't use statement expressions without value; use "do {} while (0)".
- * - Return correct values from __generic_... functions.
- *
- * Revision 1.4 2000/09/12 16:28:25 bjornw
- * * Removed comments from the get/put user asm code
- * * Constrains for destination addr in put_user cannot be memory, only reg
- *
- * Revision 1.3 2000/09/12 14:30:20 bjornw
- * MAX_ADDR_USER does not exist anymore
- *
- * Revision 1.2 2000/07/13 15:52:48 bjornw
- * New user-access functions
- *
- * Revision 1.1.1.1 2000/07/10 16:32:31 bjornw
- * CRIS architecture, working draft
- *
- *
- *
- */
- /* Asm:s have been tweaked (within the domain of correctness) to give
- satisfactory results for "gcc version 2.96 20000427 (experimental)".
- Check regularly...
- Register $r9 is chosen for temporaries, being a call-clobbered register
- first in line to be used (notably for local blocks), not colliding with
- parameter registers. */
- #ifndef _CRIS_UACCESS_H
- #define _CRIS_UACCESS_H
- #ifndef __ASSEMBLY__
- #include <linux/sched.h>
- #include <linux/errno.h>
- #include <asm/processor.h>
- #include <asm/page.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, these macros are grossly misnamed.
- */
- #define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
- /* addr_limit is the maximum accessible address for the task. we misuse
- * the KERNEL_DS and USER_DS values to both assign and compare the
- * addr_limit values through the equally misnamed get/set_fs macros.
- * (see above)
- */
- #define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF)
- #define USER_DS MAKE_MM_SEG(TASK_SIZE)
- #define get_ds() (KERNEL_DS)
- #define get_fs() (current->addr_limit)
- #define set_fs(x) (current->addr_limit = (x))
- #define segment_eq(a,b) ((a).seg == (b).seg)
- #define __kernel_ok (segment_eq(get_fs(), KERNEL_DS))
- #define __user_ok(addr,size) (((size) <= TASK_SIZE)&&((addr) <= TASK_SIZE-(size)))
- #define __access_ok(addr,size) (__kernel_ok || __user_ok((addr),(size)))
- #define access_ok(type,addr,size) __access_ok((unsigned long)(addr),(size))
- extern inline int verify_area(int type, const void * addr, unsigned long size)
- {
- return access_ok(type,addr,size) ? 0 : -EFAULT;
- }
- /*
- * 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;
- };
- /* Returns 0 if exception not found and fixup otherwise. */
- extern unsigned long search_exception_table(unsigned long);
- /*
- * These are the main single-value transfer routines. They automatically
- * use the right size if we just have the right pointer type.
- *
- * This gets kind of ugly. We want to return _two_ values in "get_user()"
- * and yet we don't want to do any pointers, because that is too much
- * of a performance impact. Thus we have a few rather ugly macros here,
- * and hide all the uglyness from the user.
- *
- * The "__xxx" versions of the user access functions are versions that
- * do not verify the address space, that must have been done previously
- * with a separate "access_ok()" call (this is used when we do multiple
- * accesses to the same area of user memory).
- *
- * As we use the same address space for kernel and user data on
- * CRIS, we can just do these as direct assignments. (Of course, the
- * exception handling means that it's no longer "just"...)
- */
- #define get_user(x,ptr)
- __get_user_check((x),(ptr),sizeof(*(ptr)))
- #define put_user(x,ptr)
- __put_user_check((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
- #define __get_user(x,ptr)
- __get_user_nocheck((x),(ptr),sizeof(*(ptr)))
- #define __put_user(x,ptr)
- __put_user_nocheck((__typeof__(*(ptr)))(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)
- do { if (put_user(x,ptr)) return ret; } while (0)
- #define get_user_ret(x,ptr,ret)
- do { if (get_user(x,ptr)) return ret; } while (0)
- #define __put_user_ret(x,ptr,ret)
- do { if (__put_user(x,ptr)) return ret; } while (0)
- #define __get_user_ret(x,ptr,ret)
- do { if (__get_user(x,ptr)) return ret; } while (0)
- extern long __put_user_bad(void);
- #define __put_user_nocheck(x,ptr,size)
- ({
- long __pu_err;
- __put_user_size((x),(ptr),(size),__pu_err);
- __pu_err;
- })
- #define __put_user_check(x,ptr,size)
- ({
- long __pu_err = -EFAULT;
- __typeof__(*(ptr)) *__pu_addr = (ptr);
- if (access_ok(VERIFY_WRITE,__pu_addr,size))
- __put_user_size((x),__pu_addr,(size),__pu_err);
- __pu_err;
- })
- #define __put_user_size(x,ptr,size,retval)
- do {
- retval = 0;
- switch (size) {
- case 1: __put_user_asm(x,ptr,retval,"move.b"); break;
- case 2: __put_user_asm(x,ptr,retval,"move.w"); break;
- case 4: __put_user_asm(x,ptr,retval,"move.d"); break;
- case 8: __put_user_asm_64(x,ptr,retval); break;
- default: __put_user_bad();
- }
- } while (0)
- struct __large_struct { unsigned long buf[100]; };
- #define __m(x) (*(struct __large_struct *)(x))
- /*
- * We don't tell gcc that we are accessing memory, but this is OK
- * because we do not write to any memory gcc knows about, so there
- * are no aliasing issues.
- *
- * Note that PC at a fault is the address *after* the faulting
- * instruction.
- */
- #define __put_user_asm(x, addr, err, op)
- __asm__ __volatile__(
- " "op" %1,[%2]n"
- "2:n"
- " .section .fixup,"ax"n"
- "3: move.d %3,%0n"
- " jump 2bn"
- " .previousn"
- " .section __ex_table,"a"n"
- " .dword 2b,3bn"
- " .previousn"
- : "=r" (err)
- : "r" (x), "r" (addr), "g" (-EFAULT), "0" (err))
- #define __put_user_asm_64(x, addr, err)
- __asm__ __volatile__(
- " move.d %M1,[%2]n"
- "2: move.d %H1,[%2+4]n"
- "4:n"
- " .section .fixup,"ax"n"
- "3: move.d %3,%0n"
- " jump 4bn"
- " .previousn"
- " .section __ex_table,"a"n"
- " .dword 2b,3bn"
- " .dword 4b,3bn"
- " .previousn"
- : "=r" (err)
- : "r" (x), "r" (addr), "g" (-EFAULT), "0" (err))
- #define __get_user_nocheck(x,ptr,size)
- ({
- long __gu_err, __gu_val;
- __get_user_size(__gu_val,(ptr),(size),__gu_err);
- (x) = (__typeof__(*(ptr)))__gu_val;
- __gu_err;
- })
- #define __get_user_check(x,ptr,size)
- ({
- long __gu_err = -EFAULT, __gu_val = 0;
- const __typeof__(*(ptr)) *__gu_addr = (ptr);
- if (access_ok(VERIFY_READ,__gu_addr,size))
- __get_user_size(__gu_val,__gu_addr,(size),__gu_err);
- (x) = (__typeof__(*(ptr)))__gu_val;
- __gu_err;
- })
- extern long __get_user_bad(void);
- #define __get_user_size(x,ptr,size,retval)
- do {
- retval = 0;
- switch (size) {
- case 1: __get_user_asm(x,ptr,retval,"move.b"); break;
- case 2: __get_user_asm(x,ptr,retval,"move.w"); break;
- case 4: __get_user_asm(x,ptr,retval,"move.d"); break;
- case 8: __get_user_asm_64(x,ptr,retval); break;
- default: (x) = __get_user_bad();
- }
- } while (0)
- /* See comment before __put_user_asm. */
- #define __get_user_asm(x, addr, err, op)
- __asm__ __volatile__(
- " "op" [%2],%1n"
- "2:n"
- " .section .fixup,"ax"n"
- "3: move.d %3,%0n"
- " moveq 0,%1n"
- " jump 2bn"
- " .previousn"
- " .section __ex_table,"a"n"
- " .dword 2b,3bn"
- " .previousn"
- : "=r" (err), "=r" (x)
- : "r" (addr), "g" (-EFAULT), "0" (err))
- #define __get_user_asm_64(x, addr, err)
- __asm__ __volatile__(
- " move.d [%2],%M1n"
- "2: move.d [%2+4],%H1n"
- "4:n"
- " .section .fixup,"ax"n"
- "3: move.d %3,%0n"
- " moveq 0,%1n"
- " jump 4bn"
- " .previousn"
- " .section __ex_table,"a"n"
- " .dword 2b,3bn"
- " .dword 4b,3bn"
- " .previousn"
- : "=r" (err), "=r" (x)
- : "r" (addr), "g" (-EFAULT), "0" (err))
- /* More complex functions. Most are inline, but some call functions that
- live in lib/usercopy.c */
- extern unsigned long __copy_user(void *to, const void *from, unsigned long n);
- extern unsigned long __copy_user_zeroing(void *to, const void *from, unsigned long n);
- extern unsigned long __do_clear_user(void *to, unsigned long n);
- /*
- * Copy a null terminated string from userspace.
- *
- * Must return:
- * -EFAULT for an exception
- * count if we hit the buffer limit
- * bytes copied if we hit a null byte
- * (without the null byte)
- */
- static inline long
- __do_strncpy_from_user(char *dst, const char *src, long count)
- {
- long res;
- if (count == 0)
- return 0;
- /*
- * Currently, in 2.4.0-test9, most ports use a simple byte-copy loop.
- * So do we.
- *
- * This code is deduced from:
- *
- * char tmp2;
- * long tmp1, tmp3
- * tmp1 = count;
- * while ((*dst++ = (tmp2 = *src++)) != 0
- * && --tmp1)
- * ;
- *
- * res = count - tmp1;
- *
- * with tweaks.
- */
- __asm__ __volatile__ (
- " move.d %3,%0n"
- " move.b [%2+],$r9n"
- "1: beq 2fn"
- " move.b $r9,[%1+]n"
- " subq 1,%0n"
- " bne 1bn"
- " move.b [%2+],$r9n"
- "2: sub.d %3,%0n"
- " neg.d %0,%0n"
- "3:n"
- " .section .fixup,"ax"n"
- "4: move.d %7,%0n"
- " jump 3bn"
- /* There's one address for a fault at the first move, and
- two possible PC values for a fault at the second move,
- being a delay-slot filler. However, the branch-target
- for the second move is the same as the first address.
- Just so you don't get confused... */
- " .previousn"
- " .section __ex_table,"a"n"
- " .dword 1b,4bn"
- " .dword 2b,4bn"
- " .previous"
- : "=r" (res), "=r" (dst), "=r" (src), "=r" (count)
- : "3" (count), "1" (dst), "2" (src), "g" (-EFAULT)
- : "r9");
- return res;
- }
- static inline unsigned long
- __generic_copy_to_user(void *to, const void *from, unsigned long n)
- {
- if (access_ok(VERIFY_WRITE, to, n))
- return __copy_user(to,from,n);
- return n;
- }
- static inline unsigned long
- __generic_copy_from_user(void *to, const void *from, unsigned long n)
- {
- if (access_ok(VERIFY_READ, from, n))
- return __copy_user_zeroing(to,from,n);
- return n;
- }
- static inline unsigned long
- __generic_clear_user(void *to, unsigned long n)
- {
- if (access_ok(VERIFY_WRITE, to, n))
- return __do_clear_user(to,n);
- return n;
- }
- static inline long
- __strncpy_from_user(char *dst, const char *src, long count)
- {
- return __do_strncpy_from_user(dst, src, count);
- }
- static inline long
- strncpy_from_user(char *dst, const char *src, long count)
- {
- long res = -EFAULT;
- if (access_ok(VERIFY_READ, src, 1))
- res = __do_strncpy_from_user(dst, src, count);
- return res;
- }
- /* A few copy asms to build up the more complex ones from.
- Note again, a post-increment is performed regardless of whether a bus
- fault occurred in that instruction, and PC for a faulted insn is the
- address *after* the insn. */
- #define __asm_copy_user_cont(to, from, ret, COPY, FIXUP, TENTRY)
- __asm__ __volatile__ (
- COPY
- "1:n"
- " .section .fixup,"ax"n"
- FIXUP
- " jump 1bn"
- " .previousn"
- " .section __ex_table,"a"n"
- TENTRY
- " .previousn"
- : "=r" (to), "=r" (from), "=r" (ret)
- : "0" (to), "1" (from), "2" (ret)
- : "r9", "memory")
- #define __asm_copy_from_user_1(to, from, ret)
- __asm_copy_user_cont(to, from, ret,
- " move.b [%1+],$r9n"
- "2: move.b $r9,[%0+]n",
- "3: addq 1,%2n"
- " clear.b [%0+]n",
- " .dword 2b,3bn")
- #define __asm_copy_from_user_2x_cont(to, from, ret, COPY, FIXUP, TENTRY)
- __asm_copy_user_cont(to, from, ret,
- " move.w [%1+],$r9n"
- "2: move.w $r9,[%0+]n" COPY,
- "3: addq 2,%2n"
- " clear.w [%0+]n" FIXUP,
- " .dword 2b,3bn" TENTRY)
- #define __asm_copy_from_user_2(to, from, ret)
- __asm_copy_from_user_2x_cont(to, from, ret, "", "", "")
- #define __asm_copy_from_user_3(to, from, ret)
- __asm_copy_from_user_2x_cont(to, from, ret,
- " move.b [%1+],$r9n"
- "4: move.b $r9,[%0+]n",
- "5: addq 1,%2n"
- " clear.b [%0+]n",
- " .dword 4b,5bn")
- #define __asm_copy_from_user_4x_cont(to, from, ret, COPY, FIXUP, TENTRY)
- __asm_copy_user_cont(to, from, ret,
- " move.d [%1+],$r9n"
- "2: move.d $r9,[%0+]n" COPY,
- "3: addq 4,%2n"
- " clear.d [%0+]n" FIXUP,
- " .dword 2b,3bn" TENTRY)
- #define __asm_copy_from_user_4(to, from, ret)
- __asm_copy_from_user_4x_cont(to, from, ret, "", "", "")
- #define __asm_copy_from_user_5(to, from, ret)
- __asm_copy_from_user_4x_cont(to, from, ret,
- " move.b [%1+],$r9n"
- "4: move.b $r9,[%0+]n",
- "5: addq 1,%2n"
- " clear.b [%0+]n",
- " .dword 4b,5bn")
- #define __asm_copy_from_user_6x_cont(to, from, ret, COPY, FIXUP, TENTRY)
- __asm_copy_from_user_4x_cont(to, from, ret,
- " move.w [%1+],$r9n"
- "4: move.w $r9,[%0+]n" COPY,
- "5: addq 2,%2n"
- " clear.w [%0+]n" FIXUP,
- " .dword 4b,5bn" TENTRY)
- #define __asm_copy_from_user_6(to, from, ret)
- __asm_copy_from_user_6x_cont(to, from, ret, "", "", "")
- #define __asm_copy_from_user_7(to, from, ret)
- __asm_copy_from_user_6x_cont(to, from, ret,
- " move.b [%1+],$r9n"
- "6: move.b $r9,[%0+]n",
- "7: addq 1,%2n"
- " clear.b [%0+]n",
- " .dword 6b,7bn")
- #define __asm_copy_from_user_8x_cont(to, from, ret, COPY, FIXUP, TENTRY)
- __asm_copy_from_user_4x_cont(to, from, ret,
- " move.d [%1+],$r9n"
- "4: move.d $r9,[%0+]n" COPY,
- "5: addq 4,%2n"
- " clear.d [%0+]n" FIXUP,
- " .dword 4b,5bn" TENTRY)
- #define __asm_copy_from_user_8(to, from, ret)
- __asm_copy_from_user_8x_cont(to, from, ret, "", "", "")
- #define __asm_copy_from_user_9(to, from, ret)
- __asm_copy_from_user_8x_cont(to, from, ret,
- " move.b [%1+],$r9n"
- "6: move.b $r9,[%0+]n",
- "7: addq 1,%2n"
- " clear.b [%0+]n",
- " .dword 6b,7bn")
- #define __asm_copy_from_user_10x_cont(to, from, ret, COPY, FIXUP, TENTRY)
- __asm_copy_from_user_8x_cont(to, from, ret,
- " move.w [%1+],$r9n"
- "6: move.w $r9,[%0+]n" COPY,
- "7: addq 2,%2n"
- " clear.w [%0+]n" FIXUP,
- " .dword 6b,7bn" TENTRY)
- #define __asm_copy_from_user_10(to, from, ret)
- __asm_copy_from_user_10x_cont(to, from, ret, "", "", "")
- #define __asm_copy_from_user_11(to, from, ret)
- __asm_copy_from_user_10x_cont(to, from, ret,
- " move.b [%1+],$r9n"
- "8: move.b $r9,[%0+]n",
- "9: addq 1,%2n"
- " clear.b [%0+]n",
- " .dword 8b,9bn")
- #define __asm_copy_from_user_12x_cont(to, from, ret, COPY, FIXUP, TENTRY)
- __asm_copy_from_user_8x_cont(to, from, ret,
- " move.d [%1+],$r9n"
- "6: move.d $r9,[%0+]n" COPY,
- "7: addq 4,%2n"
- " clear.d [%0+]n" FIXUP,
- " .dword 6b,7bn" TENTRY)
- #define __asm_copy_from_user_12(to, from, ret)
- __asm_copy_from_user_12x_cont(to, from, ret, "", "", "")
- #define __asm_copy_from_user_13(to, from, ret)
- __asm_copy_from_user_12x_cont(to, from, ret,
- " move.b [%1+],$r9n"
- "8: move.b $r9,[%0+]n",
- "9: addq 1,%2n"
- " clear.b [%0+]n",
- " .dword 8b,9bn")
- #define __asm_copy_from_user_14x_cont(to, from, ret, COPY, FIXUP, TENTRY)
- __asm_copy_from_user_12x_cont(to, from, ret,
- " move.w [%1+],$r9n"
- "8: move.w $r9,[%0+]n" COPY,
- "9: addq 2,%2n"
- " clear.w [%0+]n" FIXUP,
- " .dword 8b,9bn" TENTRY)
- #define __asm_copy_from_user_14(to, from, ret)
- __asm_copy_from_user_14x_cont(to, from, ret, "", "", "")
- #define __asm_copy_from_user_15(to, from, ret)
- __asm_copy_from_user_14x_cont(to, from, ret,
- " move.b [%1+],$r9n"
- "10: move.b $r9,[%0+]n",
- "11: addq 1,%2n"
- " clear.b [%0+]n",
- " .dword 10b,11bn")
- #define __asm_copy_from_user_16x_cont(to, from, ret, COPY, FIXUP, TENTRY)
- __asm_copy_from_user_12x_cont(to, from, ret,
- " move.d [%1+],$r9n"
- "8: move.d $r9,[%0+]n" COPY,
- "9: addq 4,%2n"
- " clear.d [%0+]n" FIXUP,
- " .dword 8b,9bn" TENTRY)
- #define __asm_copy_from_user_16(to, from, ret)
- __asm_copy_from_user_16x_cont(to, from, ret, "", "", "")
- #define __asm_copy_from_user_20x_cont(to, from, ret, COPY, FIXUP, TENTRY)
- __asm_copy_from_user_16x_cont(to, from, ret,
- " move.d [%1+],$r9n"
- "10: move.d $r9,[%0+]n" COPY,
- "11: addq 4,%2n"
- " clear.d [%0+]n" FIXUP,
- " .dword 10b,11bn" TENTRY)
- #define __asm_copy_from_user_20(to, from, ret)
- __asm_copy_from_user_20x_cont(to, from, ret, "", "", "")
- #define __asm_copy_from_user_24x_cont(to, from, ret, COPY, FIXUP, TENTRY)
- __asm_copy_from_user_20x_cont(to, from, ret,
- " move.d [%1+],$r9n"
- "12: move.d $r9,[%0+]n" COPY,
- "13: addq 4,%2n"
- " clear.d [%0+]n" FIXUP,
- " .dword 12b,13bn" TENTRY)
- #define __asm_copy_from_user_24(to, from, ret)
- __asm_copy_from_user_24x_cont(to, from, ret, "", "", "")
- /* And now, the to-user ones. */
- #define __asm_copy_to_user_1(to, from, ret)
- __asm_copy_user_cont(to, from, ret,
- " move.b [%1+],$r9n"
- " move.b $r9,[%0+]n2:n",
- "3: addq 1,%2n",
- " .dword 2b,3bn")
- #define __asm_copy_to_user_2x_cont(to, from, ret, COPY, FIXUP, TENTRY)
- __asm_copy_user_cont(to, from, ret,
- " move.w [%1+],$r9n"
- " move.w $r9,[%0+]n2:n" COPY,
- "3: addq 2,%2n" FIXUP,
- " .dword 2b,3bn" TENTRY)
- #define __asm_copy_to_user_2(to, from, ret)
- __asm_copy_to_user_2x_cont(to, from, ret, "", "", "")
- #define __asm_copy_to_user_3(to, from, ret)
- __asm_copy_to_user_2x_cont(to, from, ret,
- " move.b [%1+],$r9n"
- " move.b $r9,[%0+]n4:n",
- "5: addq 1,%2n",
- " .dword 4b,5bn")
- #define __asm_copy_to_user_4x_cont(to, from, ret, COPY, FIXUP, TENTRY)
- __asm_copy_user_cont(to, from, ret,
- " move.d [%1+],$r9n"
- " move.d $r9,[%0+]n2:n" COPY,
- "3: addq 4,%2n" FIXUP,
- " .dword 2b,3bn" TENTRY)
- #define __asm_copy_to_user_4(to, from, ret)
- __asm_copy_to_user_4x_cont(to, from, ret, "", "", "")
- #define __asm_copy_to_user_5(to, from, ret)
- __asm_copy_to_user_4x_cont(to, from, ret,
- " move.b [%1+],$r9n"
- " move.b $r9,[%0+]n4:n",
- "5: addq 1,%2n",
- " .dword 4b,5bn")
- #define __asm_copy_to_user_6x_cont(to, from, ret, COPY, FIXUP, TENTRY)
- __asm_copy_to_user_4x_cont(to, from, ret,
- " move.w [%1+],$r9n"
- " move.w $r9,[%0+]n4:n" COPY,
- "5: addq 2,%2n" FIXUP,
- " .dword 4b,5bn" TENTRY)
- #define __asm_copy_to_user_6(to, from, ret)
- __asm_copy_to_user_6x_cont(to, from, ret, "", "", "")
- #define __asm_copy_to_user_7(to, from, ret)
- __asm_copy_to_user_6x_cont(to, from, ret,
- " move.b [%1+],$r9n"
- " move.b $r9,[%0+]n6:n",
- "7: addq 1,%2n",
- " .dword 6b,7bn")
- #define __asm_copy_to_user_8x_cont(to, from, ret, COPY, FIXUP, TENTRY)
- __asm_copy_to_user_4x_cont(to, from, ret,
- " move.d [%1+],$r9n"
- " move.d $r9,[%0+]n4:n" COPY,
- "5: addq 4,%2n" FIXUP,
- " .dword 4b,5bn" TENTRY)
- #define __asm_copy_to_user_8(to, from, ret)
- __asm_copy_to_user_8x_cont(to, from, ret, "", "", "")
- #define __asm_copy_to_user_9(to, from, ret)
- __asm_copy_to_user_8x_cont(to, from, ret,
- " move.b [%1+],$r9n"
- " move.b $r9,[%0+]n6:n",
- "7: addq 1,%2n",
- " .dword 6b,7bn")
- #define __asm_copy_to_user_10x_cont(to, from, ret, COPY, FIXUP, TENTRY)
- __asm_copy_to_user_8x_cont(to, from, ret,
- " move.w [%1+],$r9n"
- " move.w $r9,[%0+]n6:n" COPY,
- "7: addq 2,%2n" FIXUP,
- " .dword 6b,7bn" TENTRY)
- #define __asm_copy_to_user_10(to, from, ret)
- __asm_copy_to_user_10x_cont(to, from, ret, "", "", "")
- #define __asm_copy_to_user_11(to, from, ret)
- __asm_copy_to_user_10x_cont(to, from, ret,
- " move.b [%1+],$r9n"
- " move.b $r9,[%0+]n8:n",
- "9: addq 1,%2n",
- " .dword 8b,9bn")
- #define __asm_copy_to_user_12x_cont(to, from, ret, COPY, FIXUP, TENTRY)
- __asm_copy_to_user_8x_cont(to, from, ret,
- " move.d [%1+],$r9n"
- " move.d $r9,[%0+]n6:n" COPY,
- "7: addq 4,%2n" FIXUP,
- " .dword 6b,7bn" TENTRY)
- #define __asm_copy_to_user_12(to, from, ret)
- __asm_copy_to_user_12x_cont(to, from, ret, "", "", "")
- #define __asm_copy_to_user_13(to, from, ret)
- __asm_copy_to_user_12x_cont(to, from, ret,
- " move.b [%1+],$r9n"
- " move.b $r9,[%0+]n8:n",
- "9: addq 1,%2n",
- " .dword 8b,9bn")
- #define __asm_copy_to_user_14x_cont(to, from, ret, COPY, FIXUP, TENTRY)
- __asm_copy_to_user_12x_cont(to, from, ret,
- " move.w [%1+],$r9n"
- " move.w $r9,[%0+]n8:n" COPY,
- "9: addq 2,%2n" FIXUP,
- " .dword 8b,9bn" TENTRY)
- #define __asm_copy_to_user_14(to, from, ret)
- __asm_copy_to_user_14x_cont(to, from, ret, "", "", "")
- #define __asm_copy_to_user_15(to, from, ret)
- __asm_copy_to_user_14x_cont(to, from, ret,
- " move.b [%1+],$r9n"
- " move.b $r9,[%0+]n10:n",
- "11: addq 1,%2n",
- " .dword 10b,11bn")
- #define __asm_copy_to_user_16x_cont(to, from, ret, COPY, FIXUP, TENTRY)
- __asm_copy_to_user_12x_cont(to, from, ret,
- " move.d [%1+],$r9n"
- " move.d $r9,[%0+]n8:n" COPY,
- "9: addq 4,%2n" FIXUP,
- " .dword 8b,9bn" TENTRY)
- #define __asm_copy_to_user_16(to, from, ret)
- __asm_copy_to_user_16x_cont(to, from, ret, "", "", "")
- #define __asm_copy_to_user_20x_cont(to, from, ret, COPY, FIXUP, TENTRY)
- __asm_copy_to_user_16x_cont(to, from, ret,
- " move.d [%1+],$r9n"
- " move.d $r9,[%0+]n10:n" COPY,
- "11: addq 4,%2n" FIXUP,
- " .dword 10b,11bn" TENTRY)
- #define __asm_copy_to_user_20(to, from, ret)
- __asm_copy_to_user_20x_cont(to, from, ret, "", "", "")
- #define __asm_copy_to_user_24x_cont(to, from, ret, COPY, FIXUP, TENTRY)
- __asm_copy_to_user_20x_cont(to, from, ret,
- " move.d [%1+],$r9n"
- " move.d $r9,[%0+]n12:n" COPY,
- "13: addq 4,%2n" FIXUP,
- " .dword 12b,13bn" TENTRY)
- #define __asm_copy_to_user_24(to, from, ret)
- __asm_copy_to_user_24x_cont(to, from, ret, "", "", "")
- /* Define a few clearing asms with exception handlers. */
- /* This frame-asm is like the __asm_copy_user_cont one, but has one less
- input. */
- #define __asm_clear(to, ret, CLEAR, FIXUP, TENTRY)
- __asm__ __volatile__ (
- CLEAR
- "1:n"
- " .section .fixup,"ax"n"
- FIXUP
- " jump 1bn"
- " .previousn"
- " .section __ex_table,"a"n"
- TENTRY
- " .previous"
- : "=r" (to), "=r" (ret)
- : "0" (to), "1" (ret)
- : "r9", "memory")
- #define __asm_clear_1(to, ret)
- __asm_clear(to, ret,
- " clear.b [%0+]n2:n",
- "3: addq 1,%1n",
- " .dword 2b,3bn")
- #define __asm_clear_2(to, ret)
- __asm_clear(to, ret,
- " clear.w [%0+]n2:n",
- "3: addq 2,%1n",
- " .dword 2b,3bn")
- #define __asm_clear_3(to, ret)
- __asm_clear(to, ret,
- " clear.w [%0+]n"
- "2: clear.b [%0+]n3:n",
- "4: addq 2,%1n"
- "5: addq 1,%1n",
- " .dword 2b,4bn"
- " .dword 3b,5bn")
- #define __asm_clear_4x_cont(to, ret, CLEAR, FIXUP, TENTRY)
- __asm_clear(to, ret,
- " clear.d [%0+]n2:n" CLEAR,
- "3: addq 4,%1n" FIXUP,
- " .dword 2b,3bn" TENTRY)
- #define __asm_clear_4(to, ret)
- __asm_clear_4x_cont(to, ret, "", "", "")
- #define __asm_clear_8x_cont(to, ret, CLEAR, FIXUP, TENTRY)
- __asm_clear_4x_cont(to, ret,
- " clear.d [%0+]n4:n" CLEAR,
- "5: addq 4,%1n" FIXUP,
- " .dword 4b,5bn" TENTRY)
- #define __asm_clear_8(to, ret)
- __asm_clear_8x_cont(to, ret, "", "", "")
- #define __asm_clear_12x_cont(to, ret, CLEAR, FIXUP, TENTRY)
- __asm_clear_8x_cont(to, ret,
- " clear.d [%0+]n6:n" CLEAR,
- "7: addq 4,%1n" FIXUP,
- " .dword 6b,7bn" TENTRY)
- #define __asm_clear_12(to, ret)
- __asm_clear_12x_cont(to, ret, "", "", "")
- #define __asm_clear_16x_cont(to, ret, CLEAR, FIXUP, TENTRY)
- __asm_clear_12x_cont(to, ret,
- " clear.d [%0+]n8:n" CLEAR,
- "9: addq 4,%1n" FIXUP,
- " .dword 8b,9bn" TENTRY)
- #define __asm_clear_16(to, ret)
- __asm_clear_16x_cont(to, ret, "", "", "")
- #define __asm_clear_20x_cont(to, ret, CLEAR, FIXUP, TENTRY)
- __asm_clear_16x_cont(to, ret,
- " clear.d [%0+]n10:n" CLEAR,
- "11: addq 4,%1n" FIXUP,
- " .dword 10b,11bn" TENTRY)
- #define __asm_clear_20(to, ret)
- __asm_clear_20x_cont(to, ret, "", "", "")
- #define __asm_clear_24x_cont(to, ret, CLEAR, FIXUP, TENTRY)
- __asm_clear_20x_cont(to, ret,
- " clear.d [%0+]n12:n" CLEAR,
- "13: addq 4,%1n" FIXUP,
- " .dword 12b,13bn" TENTRY)
- #define __asm_clear_24(to, ret)
- __asm_clear_24x_cont(to, ret, "", "", "")
- /* Note that if these expand awfully if made into switch constructs, so
- don't do that. */
- static inline unsigned long
- __constant_copy_from_user(void *to, const void *from, unsigned long n)
- {
- unsigned long ret = 0;
- if (n == 0)
- ;
- else if (n == 1)
- __asm_copy_from_user_1(to, from, ret);
- else if (n == 2)
- __asm_copy_from_user_2(to, from, ret);
- else if (n == 3)
- __asm_copy_from_user_3(to, from, ret);
- else if (n == 4)
- __asm_copy_from_user_4(to, from, ret);
- else if (n == 5)
- __asm_copy_from_user_5(to, from, ret);
- else if (n == 6)
- __asm_copy_from_user_6(to, from, ret);
- else if (n == 7)
- __asm_copy_from_user_7(to, from, ret);
- else if (n == 8)
- __asm_copy_from_user_8(to, from, ret);
- else if (n == 9)
- __asm_copy_from_user_9(to, from, ret);
- else if (n == 10)
- __asm_copy_from_user_10(to, from, ret);
- else if (n == 11)
- __asm_copy_from_user_11(to, from, ret);
- else if (n == 12)
- __asm_copy_from_user_12(to, from, ret);
- else if (n == 13)
- __asm_copy_from_user_13(to, from, ret);
- else if (n == 14)
- __asm_copy_from_user_14(to, from, ret);
- else if (n == 15)
- __asm_copy_from_user_15(to, from, ret);
- else if (n == 16)
- __asm_copy_from_user_16(to, from, ret);
- else if (n == 20)
- __asm_copy_from_user_20(to, from, ret);
- else if (n == 24)
- __asm_copy_from_user_24(to, from, ret);
- else
- ret = __generic_copy_from_user(to, from, n);
- return ret;
- }
- /* Ditto, don't make a switch out of this. */
- static inline unsigned long
- __constant_copy_to_user(void *to, const void *from, unsigned long n)
- {
- unsigned long ret = 0;
- if (n == 0)
- ;
- else if (n == 1)
- __asm_copy_to_user_1(to, from, ret);
- else if (n == 2)
- __asm_copy_to_user_2(to, from, ret);
- else if (n == 3)
- __asm_copy_to_user_3(to, from, ret);
- else if (n == 4)
- __asm_copy_to_user_4(to, from, ret);
- else if (n == 5)
- __asm_copy_to_user_5(to, from, ret);
- else if (n == 6)
- __asm_copy_to_user_6(to, from, ret);
- else if (n == 7)
- __asm_copy_to_user_7(to, from, ret);
- else if (n == 8)
- __asm_copy_to_user_8(to, from, ret);
- else if (n == 9)
- __asm_copy_to_user_9(to, from, ret);
- else if (n == 10)
- __asm_copy_to_user_10(to, from, ret);
- else if (n == 11)
- __asm_copy_to_user_11(to, from, ret);
- else if (n == 12)
- __asm_copy_to_user_12(to, from, ret);
- else if (n == 13)
- __asm_copy_to_user_13(to, from, ret);
- else if (n == 14)
- __asm_copy_to_user_14(to, from, ret);
- else if (n == 15)
- __asm_copy_to_user_15(to, from, ret);
- else if (n == 16)
- __asm_copy_to_user_16(to, from, ret);
- else if (n == 20)
- __asm_copy_to_user_20(to, from, ret);
- else if (n == 24)
- __asm_copy_to_user_24(to, from, ret);
- else
- ret = __generic_copy_to_user(to, from, n);
- return ret;
- }
- /* No switch, please. */
- static inline unsigned long
- __constant_clear_user(void *to, unsigned long n)
- {
- unsigned long ret = 0;
- if (n == 0)
- ;
- else if (n == 1)
- __asm_clear_1(to, ret);
- else if (n == 2)
- __asm_clear_2(to, ret);
- else if (n == 3)
- __asm_clear_3(to, ret);
- else if (n == 4)
- __asm_clear_4(to, ret);
- else if (n == 8)
- __asm_clear_8(to, ret);
- else if (n == 12)
- __asm_clear_12(to, ret);
- else if (n == 16)
- __asm_clear_16(to, ret);
- else if (n == 20)
- __asm_clear_20(to, ret);
- else if (n == 24)
- __asm_clear_24(to, ret);
- else
- ret = __generic_clear_user(to, n);
- return ret;
- }
- #define clear_user(to, n)
- (__builtin_constant_p(n) ?
- __constant_clear_user(to, n) :
- __generic_clear_user(to, n))
- #define copy_from_user(to, from, n)
- (__builtin_constant_p(n) ?
- __constant_copy_from_user(to, from, n) :
- __generic_copy_from_user(to, from, n))
- #define copy_to_user(to, from, n)
- (__builtin_constant_p(n) ?
- __constant_copy_to_user(to, from, n) :
- __generic_copy_to_user(to, from, n))
- #define copy_to_user_ret(to,from,n,retval)
- do { if (copy_to_user(to,from,n)) return retval; } while (0)
- #define copy_from_user_ret(to,from,n,retval)
- do { if (copy_from_user(to,from,n)) return retval; } while (0)
- /* We let the __ versions of copy_from/to_user inline, because they're often
- * used in fast paths and have only a small space overhead.
- */
- static inline unsigned long
- __generic_copy_from_user_nocheck(void *to, const void *from, unsigned long n)
- {
- return __copy_user_zeroing(to,from,n);
- }
- static inline unsigned long
- __generic_copy_to_user_nocheck(void *to, const void *from, unsigned long n)
- {
- return __copy_user(to,from,n);
- }
- static inline unsigned long
- __generic_clear_user_nocheck(void *to, unsigned long n)
- {
- return __do_clear_user(to,n);
- }
- /* without checking */
- #define __copy_to_user(to,from,n) __generic_copy_to_user_nocheck((to),(from),(n))
- #define __copy_from_user(to,from,n) __generic_copy_from_user_nocheck((to),(from),(n))
- #define __clear_user(to,n) __generic_clear_user_nocheck((to),(n))
- /*
- * Return the size of a string (including the ending 0)
- *
- * Return length of string in userspace including terminating 0
- * or 0 for error. Return a value greater than N if too long.
- */
- static inline long
- strnlen_user(const char *s, long n)
- {
- long res, tmp1;
- if (!access_ok(VERIFY_READ, s, 0))
- return 0;
- /*
- * This code is deduced from:
- *
- * tmp1 = n;
- * while (tmp1-- > 0 && *s++)
- * ;
- *
- * res = n - tmp1;
- *
- * (with tweaks).
- */
- __asm__ __volatile__ (
- " move.d %1,$r9n"
- "0:n"
- " ble 1fn"
- " subq 1,$r9n"
- " test.b [%0+]n"
- " bne 0bn"
- " test.d $r9n"
- "1:n"
- " move.d %1,%0n"
- " sub.d $r9,%0n"
- "2:n"
- " .section .fixup,"ax"n"
- "3: clear.d %0n"
- " jump 2bn"
- /* There's one address for a fault at the first move, and
- two possible PC values for a fault at the second move,
- being a delay-slot filler. However, the branch-target
- for the second move is the same as the first address.
- Just so you don't get confused... */
- " .previousn"
- " .section __ex_table,"a"n"
- " .dword 0b,3bn"
- " .dword 1b,3bn"
- " .previousn"
- : "=r" (res), "=r" (tmp1)
- : "0" (s), "1" (n)
- : "r9");
- return res;
- }
- #define strlen_user(str) strnlen_user((str), 0x7ffffffe)
- #endif /* __ASSEMBLY__ */
- #endif /* _CRIS_UACCESS_H */