diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/asm-i386/futex.h | 23 | ||||
| -rw-r--r-- | include/asm-i386/unistd.h | 4 |
2 files changed, 25 insertions, 2 deletions
diff --git a/include/asm-i386/futex.h b/include/asm-i386/futex.h index 1f39ad9d52a1..41184a31885c 100644 --- a/include/asm-i386/futex.h +++ b/include/asm-i386/futex.h @@ -107,7 +107,28 @@ futex_atomic_op_inuser (int encoded_op, int __user *uaddr) static inline int futex_atomic_cmpxchg_inuser(int __user *uaddr, int oldval, int newval) { - return -ENOSYS; + if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int))) + return -EFAULT; + + __asm__ __volatile__( + "1: " LOCK_PREFIX "cmpxchgl %3, %1 \n" + + "2: .section .fixup, \"ax\" \n" + "3: mov %2, %0 \n" + " jmp 2b \n" + " .previous \n" + + " .section __ex_table, \"a\" \n" + " .align 8 \n" + " .long 1b,3b \n" + " .previous \n" + + : "=a" (oldval), "=m" (*uaddr) + : "i" (-EFAULT), "r" (newval), "0" (oldval) + : "memory" + ); + + return oldval; } #endif diff --git a/include/asm-i386/unistd.h b/include/asm-i386/unistd.h index d8afd0e3b81a..014e3562895b 100644 --- a/include/asm-i386/unistd.h +++ b/include/asm-i386/unistd.h @@ -316,8 +316,10 @@ #define __NR_pselect6 308 #define __NR_ppoll 309 #define __NR_unshare 310 +#define __NR_set_robust_list 311 +#define __NR_get_robust_list 312 -#define NR_syscalls 311 +#define NR_syscalls 313 /* * user-visible error numbers are in the range -1 - -128: see |