mirror of
https://github.com/torvalds/linux.git
synced 2024-12-27 21:33:00 +00:00
8d7718aa08
Change futex_atomic_op_inuser and futex_atomic_cmpxchg_inatomic prototypes to use u32 types for the futex as this is the data type the futex core code uses all over the place. Signed-off-by: Michel Lespinasse <walken@google.com> Cc: Darren Hart <darren@dvhart.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Matt Turner <mattst88@gmail.com> Cc: Russell King <linux@arm.linux.org.uk> Cc: David Howells <dhowells@redhat.com> Cc: Tony Luck <tony.luck@intel.com> Cc: Michal Simek <monstr@monstr.eu> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: "James E.J. Bottomley" <jejb@parisc-linux.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Paul Mundt <lethal@linux-sh.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: Chris Metcalf <cmetcalf@tilera.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> LKML-Reference: <20110311025058.GD26122@google.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
130 lines
2.8 KiB
C
130 lines
2.8 KiB
C
#ifndef _ASM_MICROBLAZE_FUTEX_H
|
|
#define _ASM_MICROBLAZE_FUTEX_H
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <linux/futex.h>
|
|
#include <linux/uaccess.h>
|
|
#include <asm/errno.h>
|
|
|
|
#define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \
|
|
({ \
|
|
__asm__ __volatile__ ( \
|
|
"1: lwx %0, %2, r0; " \
|
|
insn \
|
|
"2: swx %1, %2, r0; \
|
|
addic %1, r0, 0; \
|
|
bnei %1, 1b; \
|
|
3: \
|
|
.section .fixup,\"ax\"; \
|
|
4: brid 3b; \
|
|
addik %1, r0, %3; \
|
|
.previous; \
|
|
.section __ex_table,\"a\"; \
|
|
.word 1b,4b,2b,4b; \
|
|
.previous;" \
|
|
: "=&r" (oldval), "=&r" (ret) \
|
|
: "b" (uaddr), "i" (-EFAULT), "r" (oparg) \
|
|
); \
|
|
})
|
|
|
|
static inline int
|
|
futex_atomic_op_inuser(int encoded_op, u32 __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(u32)))
|
|
return -EFAULT;
|
|
|
|
pagefault_disable();
|
|
|
|
switch (op) {
|
|
case FUTEX_OP_SET:
|
|
__futex_atomic_op("or %1,%4,%4;", ret, oldval, uaddr, oparg);
|
|
break;
|
|
case FUTEX_OP_ADD:
|
|
__futex_atomic_op("add %1,%0,%4;", ret, oldval, uaddr, oparg);
|
|
break;
|
|
case FUTEX_OP_OR:
|
|
__futex_atomic_op("or %1,%0,%4;", ret, oldval, uaddr, oparg);
|
|
break;
|
|
case FUTEX_OP_ANDN:
|
|
__futex_atomic_op("andn %1,%0,%4;", ret, oldval, uaddr, oparg);
|
|
break;
|
|
case FUTEX_OP_XOR:
|
|
__futex_atomic_op("xor %1,%0,%4;", 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(u32 *uval, u32 __user *uaddr,
|
|
u32 oldval, u32 newval)
|
|
{
|
|
int ret = 0, cmp;
|
|
u32 prev;
|
|
|
|
if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
|
|
return -EFAULT;
|
|
|
|
__asm__ __volatile__ ("1: lwx %1, %3, r0; \
|
|
cmp %2, %1, %4; \
|
|
beqi %2, 3f; \
|
|
2: swx %5, %3, r0; \
|
|
addic %2, r0, 0; \
|
|
bnei %2, 1b; \
|
|
3: \
|
|
.section .fixup,\"ax\"; \
|
|
4: brid 3b; \
|
|
addik %0, r0, %6; \
|
|
.previous; \
|
|
.section __ex_table,\"a\"; \
|
|
.word 1b,4b,2b,4b; \
|
|
.previous;" \
|
|
: "+r" (ret), "=&r" (prev), "=&r"(cmp) \
|
|
: "r" (uaddr), "r" (oldval), "r" (newval), "i" (-EFAULT));
|
|
|
|
*uval = prev;
|
|
return ret;
|
|
}
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif
|