Release 4.14 arch/powerpc/include/asm/futex.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_POWERPC_FUTEX_H

#define _ASM_POWERPC_FUTEX_H

#ifdef __KERNEL__

#include <linux/futex.h>
#include <linux/uaccess.h>
#include <asm/errno.h>
#include <asm/synch.h>
#include <asm/asm-compat.h>


#define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \
  __asm__ __volatile ( \
        PPC_ATOMIC_ENTRY_BARRIER \
"1:     lwarx   %0,0,%2\n" \
        insn \
        PPC405_ERR77(0, %2) \
"2:     stwcx.  %1,0,%2\n" \
        "bne-   1b\n" \
        PPC_ATOMIC_EXIT_BARRIER \
        "li     %1,0\n" \
"3:     .section .fixup,\"ax\"\n" \
"4:     li      %1,%3\n" \
        "b      3b\n" \
        ".previous\n" \
        EX_TABLE(1b, 4b) \
        EX_TABLE(2b, 4b) \
        : "=&r" (oldval), "=&r" (ret) \
        : "b" (uaddr), "i" (-EFAULT), "r" (oparg) \
        : "cr0", "memory")



static inline int arch_futex_atomic_op_inuser(int op, int oparg, int *oval,
		u32 __user *uaddr)
{
	int oldval = 0, ret;

	pagefault_disable();

	switch (op) {
	case FUTEX_OP_SET:
		__futex_atomic_op("mr %1,%4\n", ret, oldval, uaddr, oparg);
		break;
	case FUTEX_OP_ADD:
		__futex_atomic_op("add %1,%0,%4\n", ret, oldval, uaddr, oparg);
		break;
	case FUTEX_OP_OR:
		__futex_atomic_op("or %1,%0,%4\n", ret, oldval, uaddr, oparg);
		break;
	case FUTEX_OP_ANDN:
		__futex_atomic_op("andc %1,%0,%4\n", ret, oldval, uaddr, oparg);
		break;
	case FUTEX_OP_XOR:
		__futex_atomic_op("xor %1,%0,%4\n", ret, oldval, uaddr, oparg);
		break;
	default:
		ret = -ENOSYS;
	}

	pagefault_enable();

	if (!ret)
		*oval = oldval;

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jakub Jelínek
126
86.90%
1
20.00%
Jiri Slaby
11
7.59%
1
20.00%
Paul Mackerras
5
3.45%
1
20.00%
Peter Zijlstra
2
1.38%
1
20.00%
Michel Lespinasse
1
0.69%
1
20.00%
Total
145
100.00%
5
100.00%


static inline int

futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
			      u32 oldval, u32 newval)
{
	int ret = 0;
	u32 prev;

	if (!access_ok(VERIFY_WRITE, uaddr, sizeof(u32)))
		return -EFAULT;

        __asm__ __volatile__ (
        PPC_ATOMIC_ENTRY_BARRIER
"1:     lwarx   %1,0,%3         # futex_atomic_cmpxchg_inatomic\n\
        cmpw    0,%1,%4\n\
        bne-    3f\n"
        PPC405_ERR77(0,%3)
"2:     stwcx.  %5,0,%3\n\
        bne-    1b\n"
        PPC_ATOMIC_EXIT_BARRIER
"3:     .section .fixup,\"ax\"\n\
4:      li      %0,%6\n\
        b       3b\n\
        .previous\n"
        EX_TABLE(1b, 4b)
        EX_TABLE(2b, 4b)
        : "+r" (ret), "=&r" (prev), "+m" (*uaddr)
        : "r" (uaddr), "r" (oldval), "r" (newval), "i" (-EFAULT)
        : "cc", "memory");

	*uval = prev;
        return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Woodhouse
22
36.67%
1
16.67%
Michel Lespinasse
19
31.67%
2
33.33%
Ingo Molnar
18
30.00%
2
33.33%
Nicholas Piggin
1
1.67%
1
16.67%
Total
60
100.00%
6
100.00%

#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_FUTEX_H */
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Jakub Jelínek
161
63.89%
1
7.14%
David Woodhouse
22
8.73%
1
7.14%
Michel Lespinasse
20
7.94%
2
14.29%
Ingo Molnar
18
7.14%
2
14.29%
Jiri Slaby
11
4.37%
1
7.14%
David Gibson
7
2.78%
2
14.29%
Paul Mackerras
5
1.98%
1
7.14%
Jeff Dike
3
1.19%
1
7.14%
Nicholas Piggin
2
0.79%
1
7.14%
Peter Zijlstra
2
0.79%
1
7.14%
Greg Kroah-Hartman
1
0.40%
1
7.14%
Total
252
100.00%
14
100.00%
Directory: arch/powerpc/include/asm

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.