diff options
| -rw-r--r-- | arch/x86_64/ia32/ia32entry.S | 2 | ||||
| -rw-r--r-- | include/asm-x86_64/futex.h | 23 | ||||
| -rw-r--r-- | include/asm-x86_64/unistd.h | 6 |
3 files changed, 29 insertions, 2 deletions
diff --git a/arch/x86_64/ia32/ia32entry.S b/arch/x86_64/ia32/ia32entry.S index 7549a4389fb..35b2faccdc6 100644 --- a/arch/x86_64/ia32/ia32entry.S +++ b/arch/x86_64/ia32/ia32entry.S @@ -688,6 +688,8 @@ ia32_sys_call_table: .quad sys_ni_syscall /* pselect6 for now */ .quad sys_ni_syscall /* ppoll for now */ .quad sys_unshare /* 310 */ + .quad compat_sys_set_robust_list + .quad compat_sys_get_robust_list ia32_syscall_end: .rept IA32_NR_syscalls-(ia32_syscall_end-ia32_sys_call_table)/8 .quad ni_syscall diff --git a/include/asm-x86_64/futex.h b/include/asm-x86_64/futex.h index 4f4cb3410d0..7d9eb1a8454 100644 --- a/include/asm-x86_64/futex.h +++ b/include/asm-x86_64/futex.h @@ -97,7 +97,28 @@ 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" + " .quad 1b,3b \n" + " .previous \n" + + : "=a" (oldval), "=m" (*uaddr) + : "i" (-EFAULT), "r" (newval), "0" (oldval) + : "memory" + ); + + return oldval; } #endif diff --git a/include/asm-x86_64/unistd.h b/include/asm-x86_64/unistd.h index da0341c5794..fcc51635308 100644 --- a/include/asm-x86_64/unistd.h +++ b/include/asm-x86_64/unistd.h @@ -605,8 +605,12 @@ __SYSCALL(__NR_pselect6, sys_ni_syscall) /* for now */ __SYSCALL(__NR_ppoll, sys_ni_syscall) /* for now */ #define __NR_unshare 272 __SYSCALL(__NR_unshare, sys_unshare) +#define __NR_set_robust_list 273 +__SYSCALL(__NR_set_robust_list, sys_set_robust_list) +#define __NR_get_robust_list 274 +__SYSCALL(__NR_get_robust_list, sys_get_robust_list) -#define __NR_syscall_max __NR_unshare +#define __NR_syscall_max __NR_get_robust_list #ifndef __NO_STUBS |