002ca1690c
Take it out of uaccess_32.h. Since it seems that no users of the x86_64 exists, we simply pick the i386 version. Signed-off-by: Glauber Costa <gcosta@redhat.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
342 lines
9.4 KiB
C
342 lines
9.4 KiB
C
#ifndef __X86_64_UACCESS_H
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#define __X86_64_UACCESS_H
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/*
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* User space memory access functions
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*/
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#include <linux/compiler.h>
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#include <linux/errno.h>
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#include <linux/prefetch.h>
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#include <asm/page.h>
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#define ARCH_HAS_SEARCH_EXTABLE
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extern void __put_user_1(void);
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extern void __put_user_2(void);
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extern void __put_user_4(void);
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extern void __put_user_8(void);
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extern void __put_user_bad(void);
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#define __put_user_x(size, ret, x, ptr) \
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asm volatile("call __put_user_" #size \
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:"=a" (ret) \
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:"c" (ptr),"a" (x) \
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:"ebx")
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#define put_user(x, ptr) \
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__put_user_check((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
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#define __get_user(x, ptr) \
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__get_user_nocheck((x), (ptr), sizeof(*(ptr)))
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#define __put_user(x, ptr) \
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__put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
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#define __get_user_unaligned __get_user
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#define __put_user_unaligned __put_user
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#define __put_user_nocheck(x, ptr, size) \
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({ \
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int __pu_err; \
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__put_user_size((x), (ptr), (size), __pu_err); \
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__pu_err; \
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})
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#define __put_user_check(x, ptr, size) \
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({ \
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int __pu_err; \
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typeof(*(ptr)) __user *__pu_addr = (ptr); \
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switch (size) { \
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case 1: \
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__put_user_x(1, __pu_err, x, __pu_addr); \
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break; \
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case 2: \
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__put_user_x(2, __pu_err, x, __pu_addr); \
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break; \
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case 4: \
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__put_user_x(4, __pu_err, x, __pu_addr); \
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break; \
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case 8: \
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__put_user_x(8, __pu_err, x, __pu_addr); \
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break; \
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default: \
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__put_user_bad(); \
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} \
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__pu_err; \
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})
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#define __put_user_size(x, ptr, size, retval) \
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do { \
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retval = 0; \
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__chk_user_ptr(ptr); \
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switch (size) { \
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case 1: \
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__put_user_asm(x, ptr, retval, "b", "b", "iq", -EFAULT);\
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break; \
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case 2: \
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__put_user_asm(x, ptr, retval, "w", "w", "ir", -EFAULT);\
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break; \
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case 4: \
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__put_user_asm(x, ptr, retval, "l", "k", "ir", -EFAULT);\
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break; \
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case 8: \
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__put_user_asm(x, ptr, retval, "q", "", "Zr", -EFAULT); \
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break; \
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default: \
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__put_user_bad(); \
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} \
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} while (0)
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/* FIXME: this hack is definitely wrong -AK */
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struct __large_struct { unsigned long buf[100]; };
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#define __m(x) (*(struct __large_struct __user *)(x))
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/*
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* Tell gcc we read from memory instead of writing: this is because
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* we do not write to any memory gcc knows about, so there are no
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* aliasing issues.
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*/
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#define __put_user_asm(x, addr, err, itype, rtype, ltype, errno) \
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asm volatile("1: mov"itype" %"rtype"1,%2\n" \
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"2:\n" \
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".section .fixup, \"ax\"\n" \
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"3: mov %3,%0\n" \
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" jmp 2b\n" \
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".previous\n" \
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_ASM_EXTABLE(1b, 3b) \
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: "=r"(err) \
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: ltype (x), "m" (__m(addr)), "i" (errno), "0" (err))
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#define __get_user_nocheck(x, ptr, size) \
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({ \
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int __gu_err; \
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unsigned long __gu_val; \
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__get_user_size(__gu_val, (ptr), (size), __gu_err); \
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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_size(x, ptr, size, retval) \
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do { \
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retval = 0; \
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__chk_user_ptr(ptr); \
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switch (size) { \
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case 1: \
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__get_user_asm(x, ptr, retval, "b", "b", "=q", -EFAULT);\
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break; \
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case 2: \
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__get_user_asm(x, ptr, retval, "w", "w", "=r", -EFAULT);\
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break; \
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case 4: \
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__get_user_asm(x, ptr, retval, "l", "k", "=r", -EFAULT);\
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break; \
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case 8: \
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__get_user_asm(x, ptr, retval, "q", "", "=r", -EFAULT); \
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break; \
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default: \
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(x) = __get_user_bad(); \
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} \
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} while (0)
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#define __get_user_asm(x, addr, err, itype, rtype, ltype, errno) \
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asm volatile("1: mov"itype" %2,%"rtype"1\n" \
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"2:\n" \
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".section .fixup, \"ax\"\n" \
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"3: mov %3,%0\n" \
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" xor"itype" %"rtype"1,%"rtype"1\n" \
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" jmp 2b\n" \
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".previous\n" \
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_ASM_EXTABLE(1b, 3b) \
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: "=r" (err), ltype (x) \
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: "m" (__m(addr)), "i"(errno), "0"(err))
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/*
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* Copy To/From Userspace
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*/
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/* Handles exceptions in both to and from, but doesn't do access_ok */
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__must_check unsigned long
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copy_user_generic(void *to, const void *from, unsigned len);
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__must_check unsigned long
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copy_to_user(void __user *to, const void *from, unsigned len);
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__must_check unsigned long
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copy_from_user(void *to, const void __user *from, unsigned len);
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__must_check unsigned long
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copy_in_user(void __user *to, const void __user *from, unsigned len);
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static __always_inline __must_check
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int __copy_from_user(void *dst, const void __user *src, unsigned size)
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{
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int ret = 0;
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if (!__builtin_constant_p(size))
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return copy_user_generic(dst, (__force void *)src, size);
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switch (size) {
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case 1:__get_user_asm(*(u8 *)dst, (u8 __user *)src,
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ret, "b", "b", "=q", 1);
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return ret;
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case 2:__get_user_asm(*(u16 *)dst, (u16 __user *)src,
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ret, "w", "w", "=r", 2);
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return ret;
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case 4:__get_user_asm(*(u32 *)dst, (u32 __user *)src,
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ret, "l", "k", "=r", 4);
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return ret;
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case 8:__get_user_asm(*(u64 *)dst, (u64 __user *)src,
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ret, "q", "", "=r", 8);
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return ret;
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case 10:
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__get_user_asm(*(u64 *)dst, (u64 __user *)src,
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ret, "q", "", "=r", 16);
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if (unlikely(ret))
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return ret;
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__get_user_asm(*(u16 *)(8 + (char *)dst),
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(u16 __user *)(8 + (char __user *)src),
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ret, "w", "w", "=r", 2);
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return ret;
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case 16:
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__get_user_asm(*(u64 *)dst, (u64 __user *)src,
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ret, "q", "", "=r", 16);
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if (unlikely(ret))
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return ret;
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__get_user_asm(*(u64 *)(8 + (char *)dst),
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(u64 __user *)(8 + (char __user *)src),
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ret, "q", "", "=r", 8);
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return ret;
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default:
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return copy_user_generic(dst, (__force void *)src, size);
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}
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}
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static __always_inline __must_check
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int __copy_to_user(void __user *dst, const void *src, unsigned size)
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{
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int ret = 0;
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if (!__builtin_constant_p(size))
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return copy_user_generic((__force void *)dst, src, size);
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switch (size) {
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case 1:__put_user_asm(*(u8 *)src, (u8 __user *)dst,
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ret, "b", "b", "iq", 1);
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return ret;
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case 2:__put_user_asm(*(u16 *)src, (u16 __user *)dst,
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ret, "w", "w", "ir", 2);
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return ret;
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case 4:__put_user_asm(*(u32 *)src, (u32 __user *)dst,
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ret, "l", "k", "ir", 4);
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return ret;
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case 8:__put_user_asm(*(u64 *)src, (u64 __user *)dst,
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ret, "q", "", "ir", 8);
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return ret;
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case 10:
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__put_user_asm(*(u64 *)src, (u64 __user *)dst,
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ret, "q", "", "ir", 10);
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if (unlikely(ret))
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return ret;
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asm("":::"memory");
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__put_user_asm(4[(u16 *)src], 4 + (u16 __user *)dst,
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ret, "w", "w", "ir", 2);
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return ret;
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case 16:
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__put_user_asm(*(u64 *)src, (u64 __user *)dst,
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ret, "q", "", "ir", 16);
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if (unlikely(ret))
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return ret;
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asm("":::"memory");
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__put_user_asm(1[(u64 *)src], 1 + (u64 __user *)dst,
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ret, "q", "", "ir", 8);
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return ret;
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default:
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return copy_user_generic((__force void *)dst, src, size);
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}
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}
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static __always_inline __must_check
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int __copy_in_user(void __user *dst, const void __user *src, unsigned size)
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{
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int ret = 0;
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if (!__builtin_constant_p(size))
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return copy_user_generic((__force void *)dst,
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(__force void *)src, size);
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switch (size) {
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case 1: {
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u8 tmp;
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__get_user_asm(tmp, (u8 __user *)src,
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ret, "b", "b", "=q", 1);
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if (likely(!ret))
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__put_user_asm(tmp, (u8 __user *)dst,
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ret, "b", "b", "iq", 1);
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return ret;
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}
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case 2: {
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u16 tmp;
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__get_user_asm(tmp, (u16 __user *)src,
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ret, "w", "w", "=r", 2);
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if (likely(!ret))
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__put_user_asm(tmp, (u16 __user *)dst,
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ret, "w", "w", "ir", 2);
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return ret;
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}
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case 4: {
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u32 tmp;
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__get_user_asm(tmp, (u32 __user *)src,
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ret, "l", "k", "=r", 4);
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if (likely(!ret))
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__put_user_asm(tmp, (u32 __user *)dst,
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ret, "l", "k", "ir", 4);
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return ret;
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}
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case 8: {
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u64 tmp;
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__get_user_asm(tmp, (u64 __user *)src,
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ret, "q", "", "=r", 8);
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if (likely(!ret))
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__put_user_asm(tmp, (u64 __user *)dst,
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ret, "q", "", "ir", 8);
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return ret;
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}
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default:
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return copy_user_generic((__force void *)dst,
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(__force void *)src, size);
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}
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}
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__must_check long
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strncpy_from_user(char *dst, const char __user *src, long count);
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__must_check long
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__strncpy_from_user(char *dst, const char __user *src, long count);
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__must_check long strnlen_user(const char __user *str, long n);
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__must_check long __strnlen_user(const char __user *str, long n);
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__must_check long strlen_user(const char __user *str);
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__must_check unsigned long clear_user(void __user *mem, unsigned long len);
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__must_check unsigned long __clear_user(void __user *mem, unsigned long len);
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__must_check long __copy_from_user_inatomic(void *dst, const void __user *src,
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unsigned size);
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static __must_check __always_inline int
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__copy_to_user_inatomic(void __user *dst, const void *src, unsigned size)
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{
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return copy_user_generic((__force void *)dst, src, size);
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}
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#define ARCH_HAS_NOCACHE_UACCESS 1
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extern long __copy_user_nocache(void *dst, const void __user *src,
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unsigned size, int zerorest);
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static inline int __copy_from_user_nocache(void *dst, const void __user *src,
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unsigned size)
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{
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might_sleep();
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return __copy_user_nocache(dst, src, size, 1);
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}
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static inline int __copy_from_user_inatomic_nocache(void *dst,
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const void __user *src,
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unsigned size)
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{
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return __copy_user_nocache(dst, src, size, 0);
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}
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#endif /* __X86_64_UACCESS_H */
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