diff options
Diffstat (limited to 'include/asm-sparc64/futex.h')
| -rw-r--r-- | include/asm-sparc64/futex.h | 88 |
1 files changed, 84 insertions, 4 deletions
diff --git a/include/asm-sparc64/futex.h b/include/asm-sparc64/futex.h index 6a332a9f099c..0caf60147e97 100644 --- a/include/asm-sparc64/futex.h +++ b/include/asm-sparc64/futex.h | |||
| @@ -1,6 +1,86 @@ | |||
| 1 | #ifndef _ASM_FUTEX_H | 1 | #ifndef _SPARC64_FUTEX_H |
| 2 | #define _ASM_FUTEX_H | 2 | #define _SPARC64_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_cas_op(insn, ret, oldval, uaddr, oparg) \ |
| 10 | __asm__ __volatile__( \ | ||
| 11 | "\n1: lduwa [%3] %%asi, %2\n" \ | ||
| 12 | " " insn "\n" \ | ||
| 13 | "2: casa [%3] %%asi, %2, %1\n" \ | ||
| 14 | " cmp %2, %1\n" \ | ||
| 15 | " bne,pn %%icc, 1b\n" \ | ||
| 16 | " mov 0, %0\n" \ | ||
| 17 | "3:\n" \ | ||
| 18 | " .section .fixup,#alloc,#execinstr\n" \ | ||
| 19 | " .align 4\n" \ | ||
| 20 | "4: ba 3b\n" \ | ||
| 21 | " mov %5, %0\n" \ | ||
| 22 | " .previous\n" \ | ||
| 23 | " .section __ex_table,#alloc\n" \ | ||
| 24 | " .align 4\n" \ | ||
| 25 | " .word 1b, 4b\n" \ | ||
| 26 | " .word 2b, 4b\n" \ | ||
| 27 | " .previous\n" \ | ||
| 28 | : "=&r" (ret), "=&r" (oldval), "=&r" (tem) \ | ||
| 29 | : "r" (uaddr), "r" (oparg), "i" (-EFAULT) \ | ||
| 30 | : "memory") | ||
| 31 | |||
| 32 | static inline int futex_atomic_op_inuser(int encoded_op, int __user *uaddr) | ||
| 33 | { | ||
| 34 | int op = (encoded_op >> 28) & 7; | ||
| 35 | int cmp = (encoded_op >> 24) & 15; | ||
| 36 | int oparg = (encoded_op << 8) >> 20; | ||
| 37 | int cmparg = (encoded_op << 20) >> 20; | ||
| 38 | int oldval = 0, ret, tem; | ||
| 39 | |||
| 40 | if (unlikely(!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))) | ||
| 41 | return -EFAULT; | ||
| 42 | if (unlikely((((unsigned long) uaddr) & 0x3UL))) | ||
| 43 | return -EINVAL; | ||
| 44 | |||
| 45 | if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) | ||
| 46 | oparg = 1 << oparg; | ||
| 47 | |||
| 48 | inc_preempt_count(); | ||
| 49 | |||
| 50 | switch (op) { | ||
| 51 | case FUTEX_OP_SET: | ||
| 52 | __futex_cas_op("mov\t%4, %1", ret, oldval, uaddr, oparg); | ||
| 53 | break; | ||
| 54 | case FUTEX_OP_ADD: | ||
| 55 | __futex_cas_op("add\t%2, %4, %1", ret, oldval, uaddr, oparg); | ||
| 56 | break; | ||
| 57 | case FUTEX_OP_OR: | ||
| 58 | __futex_cas_op("or\t%2, %4, %1", ret, oldval, uaddr, oparg); | ||
| 59 | break; | ||
| 60 | case FUTEX_OP_ANDN: | ||
| 61 | __futex_cas_op("and\t%2, %4, %1", ret, oldval, uaddr, oparg); | ||
| 62 | break; | ||
| 63 | case FUTEX_OP_XOR: | ||
| 64 | __futex_cas_op("xor\t%2, %4, %1", ret, oldval, uaddr, oparg); | ||
| 65 | break; | ||
| 66 | default: | ||
| 67 | ret = -ENOSYS; | ||
| 68 | } | ||
| 69 | |||
| 70 | dec_preempt_count(); | ||
| 71 | |||
| 72 | if (!ret) { | ||
| 73 | switch (cmp) { | ||
| 74 | case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break; | ||
| 75 | case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break; | ||
| 76 | case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break; | ||
| 77 | case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break; | ||
| 78 | case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break; | ||
| 79 | case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break; | ||
| 80 | default: ret = -ENOSYS; | ||
| 81 | } | ||
| 82 | } | ||
| 83 | return ret; | ||
| 84 | } | ||
| 85 | |||
| 86 | #endif /* !(_SPARC64_FUTEX_H) */ | ||