diff options
Diffstat (limited to 'arch/x86_64/lib/putuser.S')
| -rw-r--r-- | arch/x86_64/lib/putuser.S | 27 |
1 files changed, 18 insertions, 9 deletions
diff --git a/arch/x86_64/lib/putuser.S b/arch/x86_64/lib/putuser.S index 0dee1fdcb16..d9d3e5ec9ad 100644 --- a/arch/x86_64/lib/putuser.S +++ b/arch/x86_64/lib/putuser.S @@ -46,36 +46,45 @@ __put_user_1: __put_user_2: GET_THREAD_INFO(%r8) addq $1,%rcx - jc bad_put_user + jc 20f cmpq threadinfo_addr_limit(%r8),%rcx - jae bad_put_user -2: movw %dx,-1(%rcx) + jae 20f +2: decq %rcx + movw %dx,(%rcx) xorl %eax,%eax ret +20: decq %rcx + jmp bad_put_user .p2align 4 .globl __put_user_4 __put_user_4: GET_THREAD_INFO(%r8) addq $3,%rcx - jc bad_put_user + jc 30f cmpq threadinfo_addr_limit(%r8),%rcx - jae bad_put_user -3: movl %edx,-3(%rcx) + jae 30f +3: subq $3,%rcx + movl %edx,(%rcx) xorl %eax,%eax ret +30: subq $3,%rcx + jmp bad_put_user .p2align 4 .globl __put_user_8 __put_user_8: GET_THREAD_INFO(%r8) addq $7,%rcx - jc bad_put_user + jc 40f cmpq threadinfo_addr_limit(%r8),%rcx - jae bad_put_user -4: movq %rdx,-7(%rcx) + jae 40f +4: subq $7,%rcx + movq %rdx,(%rcx) xorl %eax,%eax ret +40: subq $7,%rcx + jmp bad_put_user bad_put_user: movq $(-EFAULT),%rax |