Messages in this thread Patch in this message | | | Date | Thu, 16 Feb 2006 10:42:42 +0100 | From | Ingo Molnar <> | Subject | [patch 6/6] lightweight robust futexes: x86_64 |
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x86_64: add the futex_atomic_cmpxchg_inuser() assembly implementation, and wire up the new syscalls.
Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Arjan van de Ven <arjan@infradead.org> Acked-by: Ulrich Drepper <drepper@redhat.com>
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arch/x86_64/ia32/ia32entry.S | 2 ++ include/asm-x86_64/futex.h | 20 +++++++++++++++++++- include/asm-x86_64/unistd.h | 6 +++++- 3 files changed, 26 insertions(+), 2 deletions(-)
Index: linux-robust-list.q/arch/x86_64/ia32/ia32entry.S =================================================================== --- linux-robust-list.q.orig/arch/x86_64/ia32/ia32entry.S +++ linux-robust-list.q/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 Index: linux-robust-list.q/include/asm-x86_64/futex.h =================================================================== --- linux-robust-list.q.orig/include/asm-x86_64/futex.h +++ linux-robust-list.q/include/asm-x86_64/futex.h @@ -97,7 +97,25 @@ futex_atomic_op_inuser (int encoded_op, static inline int futex_atomic_cmpxchg_inuser(int __user *uaddr, int oldval, int newval) { - return -ENOSYS; + __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 Index: linux-robust-list.q/include/asm-x86_64/unistd.h =================================================================== --- linux-robust-list.q.orig/include/asm-x86_64/unistd.h +++ linux-robust-list.q/include/asm-x86_64/unistd.h @@ -605,8 +605,12 @@ __SYSCALL(__NR_pselect6, sys_ni_syscall) __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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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