| Sam Ravnborg | f5e706a | 2008-07-17 21:55:51 -0700 | [diff] [blame] | 1 | #ifndef _SPARC64_FUTEX_H |
| 2 | #define _SPARC64_FUTEX_H |
| 3 | |
| 4 | #include <linux/futex.h> |
| 5 | #include <linux/uaccess.h> |
| 6 | #include <asm/errno.h> |
| 7 | #include <asm/system.h> |
| 8 | |
| 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: sethi %%hi(3b), %0\n" \ |
| 21 | " jmpl %0 + %%lo(3b), %%g0\n" \ |
| 22 | " mov %5, %0\n" \ |
| 23 | " .previous\n" \ |
| 24 | " .section __ex_table,\"a\"\n" \ |
| 25 | " .align 4\n" \ |
| 26 | " .word 1b, 4b\n" \ |
| 27 | " .word 2b, 4b\n" \ |
| 28 | " .previous\n" \ |
| 29 | : "=&r" (ret), "=&r" (oldval), "=&r" (tem) \ |
| 30 | : "r" (uaddr), "r" (oparg), "i" (-EFAULT) \ |
| 31 | : "memory") |
| 32 | |
| 33 | static inline int futex_atomic_op_inuser(int encoded_op, int __user *uaddr) |
| 34 | { |
| 35 | int op = (encoded_op >> 28) & 7; |
| 36 | int cmp = (encoded_op >> 24) & 15; |
| 37 | int oparg = (encoded_op << 8) >> 20; |
| 38 | int cmparg = (encoded_op << 20) >> 20; |
| 39 | int oldval = 0, ret, tem; |
| 40 | |
| 41 | if (unlikely(!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))) |
| 42 | return -EFAULT; |
| 43 | if (unlikely((((unsigned long) uaddr) & 0x3UL))) |
| 44 | return -EINVAL; |
| 45 | |
| 46 | if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) |
| 47 | oparg = 1 << oparg; |
| 48 | |
| 49 | pagefault_disable(); |
| 50 | |
| 51 | switch (op) { |
| 52 | case FUTEX_OP_SET: |
| 53 | __futex_cas_op("mov\t%4, %1", ret, oldval, uaddr, oparg); |
| 54 | break; |
| 55 | case FUTEX_OP_ADD: |
| 56 | __futex_cas_op("add\t%2, %4, %1", ret, oldval, uaddr, oparg); |
| 57 | break; |
| 58 | case FUTEX_OP_OR: |
| 59 | __futex_cas_op("or\t%2, %4, %1", ret, oldval, uaddr, oparg); |
| 60 | break; |
| 61 | case FUTEX_OP_ANDN: |
| Mikael Pettersson | d72609e | 2008-07-30 15:40:50 -0700 | [diff] [blame] | 62 | __futex_cas_op("andn\t%2, %4, %1", ret, oldval, uaddr, oparg); |
| Sam Ravnborg | f5e706a | 2008-07-17 21:55:51 -0700 | [diff] [blame] | 63 | break; |
| 64 | case FUTEX_OP_XOR: |
| 65 | __futex_cas_op("xor\t%2, %4, %1", ret, oldval, uaddr, oparg); |
| 66 | break; |
| 67 | default: |
| 68 | ret = -ENOSYS; |
| 69 | } |
| 70 | |
| 71 | pagefault_enable(); |
| 72 | |
| 73 | if (!ret) { |
| 74 | switch (cmp) { |
| 75 | case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break; |
| 76 | case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break; |
| 77 | case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break; |
| 78 | case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break; |
| 79 | case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break; |
| 80 | case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break; |
| 81 | default: ret = -ENOSYS; |
| 82 | } |
| 83 | } |
| 84 | return ret; |
| 85 | } |
| 86 | |
| 87 | static inline int |
| 88 | futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval) |
| 89 | { |
| 90 | __asm__ __volatile__( |
| 91 | "\n1: casa [%3] %%asi, %2, %0\n" |
| 92 | "2:\n" |
| 93 | " .section .fixup,#alloc,#execinstr\n" |
| 94 | " .align 4\n" |
| 95 | "3: sethi %%hi(2b), %0\n" |
| 96 | " jmpl %0 + %%lo(2b), %%g0\n" |
| 97 | " mov %4, %0\n" |
| 98 | " .previous\n" |
| 99 | " .section __ex_table,\"a\"\n" |
| 100 | " .align 4\n" |
| 101 | " .word 1b, 3b\n" |
| 102 | " .previous\n" |
| 103 | : "=r" (newval) |
| 104 | : "0" (newval), "r" (oldval), "r" (uaddr), "i" (-EFAULT) |
| 105 | : "memory"); |
| 106 | |
| 107 | return newval; |
| 108 | } |
| 109 | |
| 110 | #endif /* !(_SPARC64_FUTEX_H) */ |