| #ifndef _SPARC64_FUTEX_H |
| #define _SPARC64_FUTEX_H |
| |
| #include <linux/futex.h> |
| #include <asm/errno.h> |
| #include <asm/system.h> |
| #include <asm/uaccess.h> |
| |
| #define __futex_cas_op(insn, ret, oldval, uaddr, oparg) \ |
| __asm__ __volatile__( \ |
| "\n1: lduwa [%3] %%asi, %2\n" \ |
| " " insn "\n" \ |
| "2: casa [%3] %%asi, %2, %1\n" \ |
| " cmp %2, %1\n" \ |
| " bne,pn %%icc, 1b\n" \ |
| " mov 0, %0\n" \ |
| "3:\n" \ |
| " .section .fixup,#alloc,#execinstr\n" \ |
| " .align 4\n" \ |
| "4: ba 3b\n" \ |
| " mov %5, %0\n" \ |
| " .previous\n" \ |
| " .section __ex_table,#alloc\n" \ |
| " .align 4\n" \ |
| " .word 1b, 4b\n" \ |
| " .word 2b, 4b\n" \ |
| " .previous\n" \ |
| : "=&r" (ret), "=&r" (oldval), "=&r" (tem) \ |
| : "r" (uaddr), "r" (oparg), "i" (-EFAULT) \ |
| : "memory") |
| |
| static inline int futex_atomic_op_inuser(int encoded_op, int __user *uaddr) |
| { |
| int op = (encoded_op >> 28) & 7; |
| int cmp = (encoded_op >> 24) & 15; |
| int oparg = (encoded_op << 8) >> 20; |
| int cmparg = (encoded_op << 20) >> 20; |
| int oldval = 0, ret, tem; |
| |
| if (unlikely(!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))) |
| return -EFAULT; |
| if (unlikely((((unsigned long) uaddr) & 0x3UL))) |
| return -EINVAL; |
| |
| if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) |
| oparg = 1 << oparg; |
| |
| inc_preempt_count(); |
| |
| switch (op) { |
| case FUTEX_OP_SET: |
| __futex_cas_op("mov\t%4, %1", ret, oldval, uaddr, oparg); |
| break; |
| case FUTEX_OP_ADD: |
| __futex_cas_op("add\t%2, %4, %1", ret, oldval, uaddr, oparg); |
| break; |
| case FUTEX_OP_OR: |
| __futex_cas_op("or\t%2, %4, %1", ret, oldval, uaddr, oparg); |
| break; |
| case FUTEX_OP_ANDN: |
| __futex_cas_op("and\t%2, %4, %1", ret, oldval, uaddr, oparg); |
| break; |
| case FUTEX_OP_XOR: |
| __futex_cas_op("xor\t%2, %4, %1", ret, oldval, uaddr, oparg); |
| break; |
| default: |
| ret = -ENOSYS; |
| } |
| |
| dec_preempt_count(); |
| |
| if (!ret) { |
| switch (cmp) { |
| case FUTEX_OP_CMP_EQ: ret = (oldval == cmparg); break; |
| case FUTEX_OP_CMP_NE: ret = (oldval != cmparg); break; |
| case FUTEX_OP_CMP_LT: ret = (oldval < cmparg); break; |
| case FUTEX_OP_CMP_GE: ret = (oldval >= cmparg); break; |
| case FUTEX_OP_CMP_LE: ret = (oldval <= cmparg); break; |
| case FUTEX_OP_CMP_GT: ret = (oldval > cmparg); break; |
| default: ret = -ENOSYS; |
| } |
| } |
| return ret; |
| } |
| |
| #endif /* !(_SPARC64_FUTEX_H) */ |