diff options
| author | Glauber Costa <gcosta@redhat.com> | 2008-06-25 13:17:43 -0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-07-09 09:14:26 +0200 |
| commit | e30a44fdbf11c7ca3a0096d71790f176a4a09e03 (patch) | |
| tree | 21d173ba08e47cb539c965dfb5119ff9f3b28d04 /include/asm-x86/uaccess.h | |
| parent | ec840956d269e2beefe3a1c0fd7c1c70a199087f (diff) | |
x86: merge put_user.
Move both versions, which are highly similar, to uaccess.h.
Note that, for x86_64, X86_WP_WORKS_OK is always defined.
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>
Diffstat (limited to 'include/asm-x86/uaccess.h')
| -rw-r--r-- | include/asm-x86/uaccess.h | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/include/asm-x86/uaccess.h b/include/asm-x86/uaccess.h index 4353b2267a0..3a9092af5af 100644 --- a/include/asm-x86/uaccess.h +++ b/include/asm-x86/uaccess.h @@ -178,6 +178,12 @@ extern int __get_user_bad(void); __ret_gu; \ }) +#define __put_user_x(size, x, ptr, __ret_pu) \ + asm volatile("call __put_user_" #size : "=a" (__ret_pu) \ + :"0" ((typeof(*(ptr)))(x)), "c" (ptr) : "ebx") + + + #ifdef CONFIG_X86_32 #define __put_user_u64(x, addr, err) \ asm volatile("1: movl %%eax,0(%2)\n" \ @@ -191,13 +197,71 @@ extern int __get_user_bad(void); _ASM_EXTABLE(2b, 4b) \ : "=r" (err) \ : "A" (x), "r" (addr), "i" (-EFAULT), "0" (err)) + +#define __put_user_x8(x, ptr, __ret_pu) \ + asm volatile("call __put_user_8" : "=a" (__ret_pu) \ + : "A" ((typeof(*(ptr)))(x)), "c" (ptr) : "ebx") #else #define __put_user_u64(x, ptr, retval) \ __put_user_asm(x, ptr, retval, "q", "", "Zr", -EFAULT) +#define __put_user_x8(x, ptr, __ret_pu) __put_user_x(8, x, ptr, __ret_pu) #endif +extern void __put_user_bad(void); + +/* + * Strange magic calling convention: pointer in %ecx, + * value in %eax(:%edx), return value in %eax. clobbers %rbx + */ +extern void __put_user_1(void); +extern void __put_user_2(void); +extern void __put_user_4(void); +extern void __put_user_8(void); + #ifdef CONFIG_X86_WP_WORKS_OK +/** + * put_user: - Write a simple value into user space. + * @x: Value to copy to user space. + * @ptr: Destination address, in user space. + * + * Context: User context only. This function may sleep. + * + * This macro copies a single simple value from kernel space to user + * space. It supports simple types like char and int, but not larger + * data types like structures or arrays. + * + * @ptr must have pointer-to-simple-variable type, and @x must be assignable + * to the result of dereferencing @ptr. + * + * Returns zero on success, or -EFAULT on error. + */ +#define put_user(x, ptr) \ +({ \ + int __ret_pu; \ + __typeof__(*(ptr)) __pu_val; \ + __chk_user_ptr(ptr); \ + __pu_val = x; \ + switch (sizeof(*(ptr))) { \ + case 1: \ + __put_user_x(1, __pu_val, ptr, __ret_pu); \ + break; \ + case 2: \ + __put_user_x(2, __pu_val, ptr, __ret_pu); \ + break; \ + case 4: \ + __put_user_x(4, __pu_val, ptr, __ret_pu); \ + break; \ + case 8: \ + __put_user_x8(__pu_val, ptr, __ret_pu); \ + break; \ + default: \ + __put_user_x(X, __pu_val, ptr, __ret_pu); \ + break; \ + } \ + __ret_pu; \ +}) + #define __put_user_size(x, ptr, size, retval, errret) \ do { \ retval = 0; \ @@ -231,6 +295,16 @@ do { \ retval = errret; \ } while (0) +#define put_user(x, ptr) \ +({ \ + int __ret_pu; \ + __typeof__(*(ptr))__pus_tmp = x; \ + __ret_pu = 0; \ + if (unlikely(__copy_to_user_ll(ptr, &__pus_tmp, \ + sizeof(*(ptr))) != 0)) \ + __ret_pu = -EFAULT; \ + __ret_pu; \ +}) #endif #ifdef CONFIG_X86_32 |