Commit ebfaebae authored by Ralf Baechle's avatar Ralf Baechle

Futexes for MIPS, for the time being only the R10000_LLSC_WAR version.

Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 9dbdfce8
......@@ -3,10 +3,45 @@
#ifdef __KERNEL__
#include <linux/config.h>
#include <linux/futex.h>
#include <asm/errno.h>
#include <asm/uaccess.h>
#ifdef CONFIG_SMP
#define __FUTEX_SMP_SYNC " sync \n"
#else
#define __FUTEX_SMP_SYNC
#endif
#define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \
{ \
__asm__ __volatile__( \
" .set push \n" \
" .set noat \n" \
" .set mips3 \n" \
"1: ll %1, (%3) # __futex_atomic_op1 \n" \
" .set mips0 \n" \
" " insn " \n" \
" .set mips3 \n" \
"2: sc $1, (%3) \n" \
" beqzl $1, 1b \n" \
__FUTEX_SMP_SYNC \
"3: \n" \
" .set pop \n" \
" .set mips0 \n" \
" .section .fixup,\"ax\" \n" \
"4: li %0, %5 \n" \
" j 2b \n" \
" .previous \n" \
" .section __ex_table,\"a\" \n" \
" "__UA_ADDR "\t1b, 4b \n" \
" "__UA_ADDR "\t2b, 4b \n" \
" .previous \n" \
: "=r" (ret), "=r" (oldval) \
: "0" (0), "r" (uaddr), "Jr" (oparg), "i" (-EFAULT)); \
}
static inline int
futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
{
......@@ -25,10 +60,25 @@ futex_atomic_op_inuser (int encoded_op, int __user *uaddr)
switch (op) {
case FUTEX_OP_SET:
__futex_atomic_op("move $1, %z4", ret, oldval, uaddr, oparg);
break;
case FUTEX_OP_ADD:
__futex_atomic_op("addu $1, %1, %z4",
ret, oldval, uaddr, oparg);
break;
case FUTEX_OP_OR:
__futex_atomic_op("or $1, %1, %z4",
ret, oldval, uaddr, oparg);
break;
case FUTEX_OP_ANDN:
__futex_atomic_op("and $1, %1, %z4",
ret, oldval, uaddr, ~oparg);
break;
case FUTEX_OP_XOR:
__futex_atomic_op("xor $1, %1, %z4",
ret, oldval, uaddr, oparg);
break;
default:
ret = -ENOSYS;
}
......
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