From 2f18e47c89f1a29cc815cd225b72dd7fd86acffe Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Wed, 30 Jan 2008 13:30:20 +0100 Subject: x86: merge futex_32/64.h Finally merge them together. Signed-off-by: Thomas Gleixner Signed-off-by: Ingo Molnar --- include/asm-x86/futex.h | 138 ++++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 134 insertions(+), 4 deletions(-) (limited to 'include/asm-x86/futex.h') diff --git a/include/asm-x86/futex.h b/include/asm-x86/futex.h index 1f4610e0c613..62828d63f1b1 100644 --- a/include/asm-x86/futex.h +++ b/include/asm-x86/futex.h @@ -1,5 +1,135 @@ -#ifdef CONFIG_X86_32 -# include "futex_32.h" -#else -# include "futex_64.h" +#ifndef _ASM_X86_FUTEX_H +#define _ASM_X86_FUTEX_H + +#ifdef __KERNEL__ + +#include + +#include +#include +#include +#include +#include + +#define __futex_atomic_op1(insn, ret, oldval, uaddr, oparg) \ + __asm__ __volatile( \ +"1: " insn "\n" \ +"2: .section .fixup,\"ax\"\n \ +3: mov %3, %1\n \ + jmp 2b\n \ + .previous\n \ + .section __ex_table,\"a\"\n \ + .align 8\n" \ + _ASM_PTR "1b,3b\n \ + .previous" \ + : "=r" (oldval), "=r" (ret), "+m" (*uaddr) \ + : "i" (-EFAULT), "0" (oparg), "1" (0)) + +#define __futex_atomic_op2(insn, ret, oldval, uaddr, oparg) \ + __asm__ __volatile( \ +"1: movl %2, %0\n \ + movl %0, %3\n" \ + insn "\n" \ +"2: " LOCK_PREFIX "cmpxchgl %3, %2\n \ + jnz 1b\n \ +3: .section .fixup,\"ax\"\n \ +4: mov %5, %1\n \ + jmp 3b\n \ + .previous\n \ + .section __ex_table,\"a\"\n \ + .align 8\n" \ + _ASM_PTR "1b,4b,2b,4b\n \ + .previous" \ + : "=&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 (!access_ok(VERIFY_WRITE, uaddr, sizeof(int))) + return -EFAULT; + + __asm__ __volatile__( + "1: " LOCK_PREFIX "cmpxchgl %3, %1 \n" + + "2: .section .fixup, \"ax\" \n" + "3: mov %2, %0 \n" + " jmp 2b \n" + " .previous \n" + + " .section __ex_table, \"a\" \n" + " .align 8 \n" + _ASM_PTR " 1b,3b \n" + " .previous \n" + + : "=a" (oldval), "+m" (*uaddr) + : "i" (-EFAULT), "r" (newval), "0" (oldval) + : "memory" + ); + + return oldval; +} + +#endif #endif -- cgit v1.2.2