diff options
| author | Jakub Jelinek <jakub@redhat.com> | 2006-09-26 17:00:56 -0400 |
|---|---|---|
| committer | Tony Luck <tony.luck@intel.com> | 2006-09-26 17:00:56 -0400 |
| commit | a192dc16000241dc02990a36b6830839b73c44de (patch) | |
| tree | 31c228936a92bab32d950aadce2316cc7abdc39b /include/asm-ia64/futex.h | |
| parent | fd1dfc6f0165e2ad426665e517103672d6832f90 (diff) | |
[IA64] Implement futex primitives
Implement futex_atomic_op_inuser() and futex_atomic_cmpxchg_inatomic()
on IA64 in order to fully support all futex functionality.
Signed-off-by: Jakub Jelinek <jakub@redhat.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'include/asm-ia64/futex.h')
| -rw-r--r-- | include/asm-ia64/futex.h | 122 |
1 files changed, 120 insertions, 2 deletions
diff --git a/include/asm-ia64/futex.h b/include/asm-ia64/futex.h index 6a332a9f099c..07d77f3a8cbe 100644 --- a/include/asm-ia64/futex.h +++ b/include/asm-ia64/futex.h | |||
| @@ -1,6 +1,124 @@ | |||
| 1 | #ifndef _ASM_FUTEX_H | 1 | #ifndef _ASM_FUTEX_H |
| 2 | #define _ASM_FUTEX_H | 2 | #define _ASM_FUTEX_H |
| 3 | 3 | ||
| 4 | #include <asm-generic/futex.h> | 4 | #include <linux/futex.h> |
| 5 | #include <asm/errno.h> | ||
| 6 | #include <asm/system.h> | ||
| 7 | #include <asm/uaccess.h> | ||
| 5 | 8 | ||
| 6 | #endif | 9 | #define __futex_atomic_op1(insn, ret, oldval, uaddr, oparg) \ |
| 10 | do { \ | ||
| 11 | register unsigned long r8 __asm ("r8") = 0; \ | ||
| 12 | __asm__ __volatile__( \ | ||
| 13 | " mf;; \n" \ | ||
| 14 | "[1:] " insn ";; \n" \ | ||
| 15 | " .xdata4 \"__ex_table\", 1b-., 2f-. \n" \ | ||
| 16 | "[2:]" \ | ||
| 17 | : "+r" (r8), "=r" (oldval) \ | ||
| 18 | : "r" (uaddr), "r" (oparg) \ | ||
| 19 | : "memory"); \ | ||
| 20 | ret = r8; \ | ||
| 21 | } while (0) | ||
| 22 | |||
| 23 | #define __futex_atomic_op2(insn, ret, oldval, uaddr, oparg) \ | ||
| 24 | do { \ | ||
| 25 | register unsigned long r8 __asm ("r8") = 0; \ | ||
| 26 | int val, newval; \ | ||
| 27 | do { \ | ||
| 28 | __asm__ __volatile__( \ | ||
| 29 | " mf;; \n" \ | ||
| 30 | "[1:] ld4 %3=[%4];; \n" \ | ||
| 31 | " mov %2=%3 \n" \ | ||
| 32 | insn ";; \n" \ | ||
| 33 | " mov ar.ccv=%2;; \n" \ | ||
| 34 | "[2:] cmpxchg4.acq %1=[%4],%3,ar.ccv;; \n" \ | ||
| 35 | " .xdata4 \"__ex_table\", 1b-., 3f-.\n" \ | ||
| 36 | " .xdata4 \"__ex_table\", 2b-., 3f-.\n" \ | ||
| 37 | "[3:]" \ | ||
| 38 | : "+r" (r8), "=r" (val), "=&r" (oldval), \ | ||
| 39 | "=&r" (newval) \ | ||
| 40 | : "r" (uaddr), "r" (oparg) \ | ||
| 41 | : "memory"); \ | ||
| 42 | if (unlikely (r8)) \ | ||
| 43 | break; \ | ||
| 44 | } while (unlikely (val != oldval)); \ | ||
| 45 | ret = r8; \ | ||
| 46 | } while (0) | ||
| 47 | |||
| 48 | static inline int | ||
| 49 | futex_atomic_op_inuser (int encoded_op, int __user *uaddr) | ||
| 50 | { | ||
| 51 | int op = (encoded_op >> 28) & 7; | ||
| 52 | int cmp = (encoded_op >> 24) & 15; | ||
| 53 | int oparg = (encoded_op << 8) >> 20; | ||
| 54 | int cmparg = (encoded_op << 20) >> 20; | ||
| 55 | int oldval = 0, ret; | ||
| 56 | if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) | ||
| 57 | oparg = 1 << oparg; | ||
| 58 | |||
| 59 | if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int))) | ||
| 60 | return -EFAULT; | ||
| 61 | |||
| 62 | inc_preempt_count(); | ||
| 63 | |||
| 64 | switch (op) { | ||
| 65 | case FUTEX_OP_SET: | ||
| 66 | __futex_atomic_op1("xchg4 %1=[%2],%3", ret, oldval, uaddr, | ||
| 67 | oparg); | ||
| 68 | break; | ||
| 69 | case FUTEX_OP_ADD: | ||
| 70 | __futex_atomic_op2("add %3=%3,%5", ret, oldval, uaddr, oparg); | ||
| 71 | break; | ||
| 72 | case FUTEX_OP_OR: | ||
| 73 | __futex_atomic_op2("or %3=%3,%5", ret, oldval, uaddr, oparg); | ||
| 74 | break; | ||
| 75 | case FUTEX_OP_ANDN: | ||
| 76 | __futex_atomic_op2("and %3=%3,%5", ret, oldval, uaddr, | ||
| 77 | ~oparg); | ||
| 78 | break; | ||
| 79 | case FUTEX_OP_XOR: | ||
| 80 | __futex_atomic_op2("xor %3=%3,%5", ret, oldval, uaddr, oparg); | ||
| 81 | break; | ||
| 82 | default: | ||
| 83 | ret = -ENOSYS; | ||
| 84 | } | ||
| 85 | |||
| 86 | dec_preempt_count(); | ||
| 87 | |||
| 88 | if (!ret) { | ||
| 89 | switch (cmp) { | ||
| 90 | case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break; | ||
| 91 | case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break; | ||
| 92 | case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break; | ||
| 93 | case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break; | ||
| 94 | case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break; | ||
| 95 | case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break; | ||
| 96 | default: ret = -ENOSYS; | ||
| 97 | } | ||
| 98 | } | ||
| 99 | return ret; | ||
| 100 | } | ||
| 101 | |||
| 102 | static inline int | ||
| 103 | futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval) | ||
| 104 | { | ||
| 105 | if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int))) | ||
| 106 | return -EFAULT; | ||
| 107 | |||
| 108 | { | ||
| 109 | register unsigned long r8 __asm ("r8"); | ||
| 110 | __asm__ __volatile__( | ||
| 111 | " mf;; \n" | ||
| 112 | " mov ar.ccv=%3;; \n" | ||
| 113 | "[1:] cmpxchg4.acq %0=[%1],%2,ar.ccv \n" | ||
| 114 | " .xdata4 \"__ex_table\", 1b-., 2f-. \n" | ||
| 115 | "[2:]" | ||
| 116 | : "=r" (r8) | ||
| 117 | : "r" (uaddr), "r" (newval), | ||
| 118 | "rO" ((long) (unsigned) oldval) | ||
| 119 | : "memory"); | ||
| 120 | return r8; | ||
| 121 | } | ||
| 122 | } | ||
| 123 | |||
| 124 | #endif /* _ASM_FUTEX_H */ | ||