diff options
Diffstat (limited to 'include/asm-x86/futex.h')
| -rw-r--r-- | include/asm-x86/futex.h | 140 |
1 files changed, 0 insertions, 140 deletions
diff --git a/include/asm-x86/futex.h b/include/asm-x86/futex.h deleted file mode 100644 index 06b924ef6fa5..000000000000 --- a/include/asm-x86/futex.h +++ /dev/null @@ -1,140 +0,0 @@ -#ifndef ASM_X86__FUTEX_H -#define ASM_X86__FUTEX_H - -#ifdef __KERNEL__ - -#include <linux/futex.h> -#include <linux/uaccess.h> - -#include <asm/asm.h> -#include <asm/errno.h> -#include <asm/processor.h> -#include <asm/system.h> - -#define __futex_atomic_op1(insn, ret, oldval, uaddr, oparg) \ - asm volatile("1:\t" insn "\n" \ - "2:\t.section .fixup,\"ax\"\n" \ - "3:\tmov\t%3, %1\n" \ - "\tjmp\t2b\n" \ - "\t.previous\n" \ - _ASM_EXTABLE(1b, 3b) \ - : "=r" (oldval), "=r" (ret), "+m" (*uaddr) \ - : "i" (-EFAULT), "0" (oparg), "1" (0)) - -#define __futex_atomic_op2(insn, ret, oldval, uaddr, oparg) \ - asm volatile("1:\tmovl %2, %0\n" \ - "\tmovl\t%0, %3\n" \ - "\t" insn "\n" \ - "2:\t" LOCK_PREFIX "cmpxchgl %3, %2\n" \ - "\tjnz\t1b\n" \ - "3:\t.section .fixup,\"ax\"\n" \ - "4:\tmov\t%5, %1\n" \ - "\tjmp\t3b\n" \ - "\t.previous\n" \ - _ASM_EXTABLE(1b, 4b) \ - _ASM_EXTABLE(2b, 4b) \ - : "=&a" (oldval), "=&r" (ret), \ - "+m" (*uaddr), "=&r" (tem) \ - : "r" (oparg), "i" (-EFAULT), "1" (0)) - -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 (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28)) - oparg = 1 << oparg; - - if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int))) - return -EFAULT; - -#if defined(CONFIG_X86_32) && !defined(CONFIG_X86_BSWAP) - /* Real i386 machines can only support FUTEX_OP_SET */ - if (op != FUTEX_OP_SET && boot_cpu_data.x86 == 3) - return -ENOSYS; -#endif - - pagefault_disable(); - - switch (op) { - case FUTEX_OP_SET: - __futex_atomic_op1("xchgl %0, %2", ret, oldval, uaddr, oparg); - break; - case FUTEX_OP_ADD: - __futex_atomic_op1(LOCK_PREFIX "xaddl %0, %2", ret, oldval, - uaddr, oparg); - break; - case FUTEX_OP_OR: - __futex_atomic_op2("orl %4, %3", ret, oldval, uaddr, oparg); - break; - case FUTEX_OP_ANDN: - __futex_atomic_op2("andl %4, %3", ret, oldval, uaddr, ~oparg); - break; - case FUTEX_OP_XOR: - __futex_atomic_op2("xorl %4, %3", 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) -{ - -#if defined(CONFIG_X86_32) && !defined(CONFIG_X86_BSWAP) - /* Real i386 machines have no cmpxchg instruction */ - if (boot_cpu_data.x86 == 3) - return -ENOSYS; -#endif - - if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int))) - return -EFAULT; - - asm volatile("1:\t" LOCK_PREFIX "cmpxchgl %3, %1\n" - "2:\t.section .fixup, \"ax\"\n" - "3:\tmov %2, %0\n" - "\tjmp 2b\n" - "\t.previous\n" - _ASM_EXTABLE(1b, 3b) - : "=a" (oldval), "+m" (*uaddr) - : "i" (-EFAULT), "r" (newval), "0" (oldval) - : "memory" - ); - - return oldval; -} - -#endif -#endif /* ASM_X86__FUTEX_H */ |
