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authorAl Viro <viro@zeniv.linux.org.uk>2008-08-17 21:05:42 -0400
committerH. Peter Anvin <hpa@zytor.com>2008-10-22 22:55:20 -0700
commitbb8985586b7a906e116db835c64773b7a7d51663 (patch)
treede93ae58e88cc563d95cc124a73f3930594c6100 /include/asm-x86/futex.h
parent8ede0bdb63305d3353efd97e9af6210afb05734e (diff)
x86, um: ... and asm-x86 move
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'include/asm-x86/futex.h')
-rw-r--r--include/asm-x86/futex.h140
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 */