#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: sethi %%hi(3b), %0\n" \ " jmpl %0 + %%lo(3b), %%g0\n" \ " mov %5, %0\n" \ " .previous\n" \ " .section __ex_table,\"a\"\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; pagefault_disable(); 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; } pagefault_enable(); 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; } static inline int futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval) { __asm__ __volatile__( "\n1: casa [%3] %%asi, %2, %0\n" "2:\n" " .section .fixup,#alloc,#execinstr\n" " .align 4\n" "3: sethi %%hi(2b), %0\n" " jmpl %0 + %%lo(2b), %%g0\n" " mov %4, %0\n" " .previous\n" " .section __ex_table,\"a\"\n" " .align 4\n" " .word 1b, 3b\n" " .previous\n" : "=r" (newval) : "0" (newval), "r" (oldval), "r" (uaddr), "i" (-EFAULT) : "memory"); return newval; } #endif /* !(_SPARC64_FUTEX_H) */