diff options
Diffstat (limited to 'include/asm-x86/uaccess.h')
| -rw-r--r-- | include/asm-x86/uaccess.h | 50 |
1 files changed, 49 insertions, 1 deletions
diff --git a/include/asm-x86/uaccess.h b/include/asm-x86/uaccess.h index bcda5d075921..4353b2267a02 100644 --- a/include/asm-x86/uaccess.h +++ b/include/asm-x86/uaccess.h @@ -233,6 +233,47 @@ do { \ #endif +#ifdef CONFIG_X86_32 +#define __get_user_asm_u64(x, ptr, retval, errret) (x) = __get_user_bad() +#else +#define __get_user_asm_u64(x, ptr, retval, errret) \ + __get_user_asm(x, ptr, retval, "q", "", "=r", errret) +#endif + +#define __get_user_size(x, ptr, size, retval, errret) \ +do { \ + retval = 0; \ + __chk_user_ptr(ptr); \ + 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", "k", "=r", errret); \ + break; \ + case 8: \ + __get_user_asm_u64(x, ptr, retval, errret); \ + break; \ + default: \ + (x) = __get_user_bad(); \ + } \ +} while (0) + +#define __get_user_asm(x, addr, err, itype, rtype, ltype, errret) \ + asm volatile("1: mov"itype" %2,%"rtype"1\n" \ + "2:\n" \ + ".section .fixup,\"ax\"\n" \ + "3: mov %3,%0\n" \ + " xor"itype" %"rtype"1,%"rtype"1\n" \ + " jmp 2b\n" \ + ".previous\n" \ + _ASM_EXTABLE(1b, 3b) \ + : "=r" (err), ltype(x) \ + : "m" (__m(addr)), "i" (errret), "0" (err)) + #define __put_user_nocheck(x, ptr, size) \ ({ \ long __pu_err; \ @@ -240,7 +281,14 @@ do { \ __pu_err; \ }) - +#define __get_user_nocheck(x, ptr, size) \ +({ \ + long __gu_err; \ + unsigned long __gu_val; \ + __get_user_size(__gu_val, (ptr), (size), __gu_err, -EFAULT); \ + (x) = (__force __typeof__(*(ptr)))__gu_val; \ + __gu_err; \ +}) /* FIXME: this hack is definitely wrong -AK */ struct __large_struct { unsigned long buf[100]; }; |