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#ifndef __i386_UACCESS_H
#define __i386_UACCESS_H
/*
* Test whether a block of memory is a valid user space address.
* Returns 0 if the range is valid, nonzero otherwise.
*
* This is equivalent to the following test:
* (u33)addr + (u33)size >= (u33)HYPERVISOR_VIRT_START
*/
#define __range_not_ok(addr,size) ({ \
unsigned long flag,sum; \
asm("addl %3,%1 ; sbbl %0,%0; cmpl %1,%4; sbbl $0,%0" \
:"=&r" (flag), "=r" (sum) \
:"1" (addr),"g" ((int)(size)),"r" (HYPERVISOR_VIRT_START)); \
flag; })
#define __addr_ok(addr) (likely((unsigned long)(addr) < HYPERVISOR_VIRT_START))
#define access_ok(addr,size) (likely(__range_not_ok(addr,size) == 0))
#define array_access_ok(addr,count,size) \
(likely(count < (~0UL/size)) && access_ok(addr,count*size))
/* Undefined function to catch size mismatches on 64-bit get_user/put_user. */
extern void __uaccess_var_not_u64(void);
#define __put_user_u64(x, addr, retval, errret) \
if (sizeof(x) != 8) __uaccess_var_not_u64(); \
__asm__ __volatile__( \
"1: movl %%eax,0(%2)\n" \
"2: movl %%edx,4(%2)\n" \
"3:\n" \
".section .fixup,\"ax\"\n" \
"4: movl %3,%0\n" \
" jmp 3b\n" \
".previous\n" \
_ASM_EXTABLE(1b, 4b) \
_ASM_EXTABLE(2b, 4b) \
: "=r"(retval) \
: "A" (x), "r" (addr), "i"(errret), "0"(retval))
#define __put_user_size(x,ptr,size,retval,errret) \
do { \
retval = 0; \
switch (size) { \
case 1: __put_user_asm(x,ptr,retval,"b","b","iq",errret);break; \
case 2: __put_user_asm(x,ptr,retval,"w","w","ir",errret);break; \
case 4: __put_user_asm(x,ptr,retval,"l","","ir",errret); break; \
case 8: __put_user_u64((__typeof__(*ptr))(x),ptr,retval,errret);break;\
default: __put_user_bad(); \
} \
} while (0)
#define __get_user_u64(x, addr, retval, errret) \
if (sizeof(x) != 8) __uaccess_var_not_u64(); \
__asm__ __volatile__( \
"1: movl 0(%2),%%eax\n" \
"2: movl 4(%2),%%edx\n" \
"3:\n" \
".section .fixup,\"ax\"\n" \
"4: movl %3,%0\n" \
" xorl %%eax,%%eax\n" \
" xorl %%edx,%%edx\n" \
" jmp 3b\n" \
".previous\n" \
_ASM_EXTABLE(1b, 4b) \
_ASM_EXTABLE(2b, 4b) \
: "=r" (retval), "=&A" (x) \
: "r" (addr), "i"(errret), "0"(retval))
#define __get_user_size(x,ptr,size,retval,errret) \
do { \
retval = 0; \
switch (size) { \
case 1: __get_user_asm(x,ptr,retval,"b","b","=q",errret);break; \
case 2: __get_user_asm(x,ptr,retval,"w","w","=r",errret);break; \
case 4: __get_user_asm(x,ptr,retval,"l","","=r",errret);break; \
case 8: __get_user_u64(x,ptr,retval,errret);break; \
default: __get_user_bad(); \
} \
} while (0)
#endif /* __i386_UACCESS_H */
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