+++ /dev/null
-/*
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (c) 2006 Ralf Baechle (ralf@linux-mips.org)
- */
-#ifndef _ASM_FUTEX_H
-#define _ASM_FUTEX_H
-
-#ifdef __KERNEL__
-
-#include <linux/futex.h>
-#include <linux/uaccess.h>
-#include <asm/barrier.h>
-#include <asm/errno.h>
-#include <asm/war.h>
-
-#define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \
-{ \
- if (cpu_has_llsc && R10000_LLSC_WAR) { \
- __asm__ __volatile__( \
- " .set push \n" \
- " .set noat \n" \
- " .set mips3 \n" \
- "1: ll %1, %4 # __futex_atomic_op \n" \
- " .set mips0 \n" \
- " " insn " \n" \
- " .set mips3 \n" \
- "2: sc $1, %2 \n" \
- " beqzl $1, 1b \n" \
- __WEAK_LLSC_MB \
- "3: \n" \
- " .set pop \n" \
- " .set mips0 \n" \
- " .section .fixup,\"ax\" \n" \
- "4: li %0, %6 \n" \
- " j 3b \n" \
- " .previous \n" \
- " .section __ex_table,\"a\" \n" \
- " "__UA_ADDR "\t1b, 4b \n" \
- " "__UA_ADDR "\t2b, 4b \n" \
- " .previous \n" \
- : "=r" (ret), "=&r" (oldval), "=R" (*uaddr) \
- : "0" (0), "R" (*uaddr), "Jr" (oparg), "i" (-EFAULT) \
- : "memory"); \
- } else if (cpu_has_llsc) { \
- __asm__ __volatile__( \
- " .set push \n" \
- " .set noat \n" \
- " .set mips3 \n" \
- "1: ll %1, %4 # __futex_atomic_op \n" \
- " .set mips0 \n" \
- " " insn " \n" \
- " .set mips3 \n" \
- "2: sc $1, %2 \n" \
- " beqz $1, 1b \n" \
- __WEAK_LLSC_MB \
- "3: \n" \
- " .set pop \n" \
- " .set mips0 \n" \
- " .section .fixup,\"ax\" \n" \
- "4: li %0, %6 \n" \
- " j 3b \n" \
- " .previous \n" \
- " .section __ex_table,\"a\" \n" \
- " "__UA_ADDR "\t1b, 4b \n" \
- " "__UA_ADDR "\t2b, 4b \n" \
- " .previous \n" \
- : "=r" (ret), "=&r" (oldval), "=R" (*uaddr) \
- : "0" (0), "R" (*uaddr), "Jr" (oparg), "i" (-EFAULT) \
- : "memory"); \
- } else \
- ret = -ENOSYS; \
-}
-
-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;
- if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
- oparg = 1 << oparg;
-
- if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
- return -EFAULT;
-
- pagefault_disable();
-
- switch (op) {
- case FUTEX_OP_SET:
- __futex_atomic_op("move $1, %z5", ret, oldval, uaddr, oparg);
- break;
-
- case FUTEX_OP_ADD:
- __futex_atomic_op("addu $1, %1, %z5",
- ret, oldval, uaddr, oparg);
- break;
- case FUTEX_OP_OR:
- __futex_atomic_op("or $1, %1, %z5",
- ret, oldval, uaddr, oparg);
- break;
- case FUTEX_OP_ANDN:
- __futex_atomic_op("and $1, %1, %z5",
- ret, oldval, uaddr, ~oparg);
- break;
- case FUTEX_OP_XOR:
- __futex_atomic_op("xor $1, %1, %z5",
- 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)
-{
- int retval;
-
- if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
- return -EFAULT;
-
- if (cpu_has_llsc && R10000_LLSC_WAR) {
- __asm__ __volatile__(
- "# futex_atomic_cmpxchg_inatomic \n"
- " .set push \n"
- " .set noat \n"
- " .set mips3 \n"
- "1: ll %0, %2 \n"
- " bne %0, %z3, 3f \n"
- " .set mips0 \n"
- " move $1, %z4 \n"
- " .set mips3 \n"
- "2: sc $1, %1 \n"
- " beqzl $1, 1b \n"
- __WEAK_LLSC_MB
- "3: \n"
- " .set pop \n"
- " .section .fixup,\"ax\" \n"
- "4: li %0, %5 \n"
- " j 3b \n"
- " .previous \n"
- " .section __ex_table,\"a\" \n"
- " "__UA_ADDR "\t1b, 4b \n"
- " "__UA_ADDR "\t2b, 4b \n"
- " .previous \n"
- : "=&r" (retval), "=R" (*uaddr)
- : "R" (*uaddr), "Jr" (oldval), "Jr" (newval), "i" (-EFAULT)
- : "memory");
- } else if (cpu_has_llsc) {
- __asm__ __volatile__(
- "# futex_atomic_cmpxchg_inatomic \n"
- " .set push \n"
- " .set noat \n"
- " .set mips3 \n"
- "1: ll %0, %2 \n"
- " bne %0, %z3, 3f \n"
- " .set mips0 \n"
- " move $1, %z4 \n"
- " .set mips3 \n"
- "2: sc $1, %1 \n"
- " beqz $1, 1b \n"
- __WEAK_LLSC_MB
- "3: \n"
- " .set pop \n"
- " .section .fixup,\"ax\" \n"
- "4: li %0, %5 \n"
- " j 3b \n"
- " .previous \n"
- " .section __ex_table,\"a\" \n"
- " "__UA_ADDR "\t1b, 4b \n"
- " "__UA_ADDR "\t2b, 4b \n"
- " .previous \n"
- : "=&r" (retval), "=R" (*uaddr)
- : "R" (*uaddr), "Jr" (oldval), "Jr" (newval), "i" (-EFAULT)
- : "memory");
- } else
- return -ENOSYS;
-
- return retval;
-}
-
-#endif
-#endif /* _ASM_FUTEX_H */
projects / karo-tx-linux.git / blobdiff