mirror of https://gitee.com/openkylin/linux.git
117 lines
2.7 KiB
C
117 lines
2.7 KiB
C
#ifndef _ASM_ALPHA_FUTEX_H
|
|
#define _ASM_ALPHA_FUTEX_H
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <linux/futex.h>
|
|
#include <linux/uaccess.h>
|
|
#include <asm/errno.h>
|
|
#include <asm/barrier.h>
|
|
|
|
#define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \
|
|
__asm__ __volatile__( \
|
|
__ASM_SMP_MB \
|
|
"1: ldl_l %0,0(%2)\n" \
|
|
insn \
|
|
"2: stl_c %1,0(%2)\n" \
|
|
" beq %1,4f\n" \
|
|
" mov $31,%1\n" \
|
|
"3: .subsection 2\n" \
|
|
"4: br 1b\n" \
|
|
" .previous\n" \
|
|
" .section __ex_table,\"a\"\n" \
|
|
" .long 1b-.\n" \
|
|
" lda $31,3b-1b(%1)\n" \
|
|
" .long 2b-.\n" \
|
|
" lda $31,3b-2b(%1)\n" \
|
|
" .previous\n" \
|
|
: "=&r" (oldval), "=&r"(ret) \
|
|
: "r" (uaddr), "r"(oparg) \
|
|
: "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;
|
|
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("mov %3,%1\n", ret, oldval, uaddr, oparg);
|
|
break;
|
|
case FUTEX_OP_ADD:
|
|
__futex_atomic_op("addl %0,%3,%1\n", ret, oldval, uaddr, oparg);
|
|
break;
|
|
case FUTEX_OP_OR:
|
|
__futex_atomic_op("or %0,%3,%1\n", ret, oldval, uaddr, oparg);
|
|
break;
|
|
case FUTEX_OP_ANDN:
|
|
__futex_atomic_op("andnot %0,%3,%1\n", ret, oldval, uaddr, oparg);
|
|
break;
|
|
case FUTEX_OP_XOR:
|
|
__futex_atomic_op("xor %0,%3,%1\n", 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 prev, cmp;
|
|
|
|
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
|
|
return -EFAULT;
|
|
|
|
__asm__ __volatile__ (
|
|
__ASM_SMP_MB
|
|
"1: ldl_l %0,0(%2)\n"
|
|
" cmpeq %0,%3,%1\n"
|
|
" beq %1,3f\n"
|
|
" mov %4,%1\n"
|
|
"2: stl_c %1,0(%2)\n"
|
|
" beq %1,4f\n"
|
|
"3: .subsection 2\n"
|
|
"4: br 1b\n"
|
|
" .previous\n"
|
|
" .section __ex_table,\"a\"\n"
|
|
" .long 1b-.\n"
|
|
" lda $31,3b-1b(%0)\n"
|
|
" .long 2b-.\n"
|
|
" lda $31,3b-2b(%0)\n"
|
|
" .previous\n"
|
|
: "=&r"(prev), "=&r"(cmp)
|
|
: "r"(uaddr), "r"((long)oldval), "r"(newval)
|
|
: "memory");
|
|
|
|
return prev;
|
|
}
|
|
|
|
#endif /* __KERNEL__ */
|
|
#endif /* _ASM_ALPHA_FUTEX_H */
|