Release 4.11 arch/powerpc/include/asm/futex.h

#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 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("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) {
		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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jakub Jelínek
289
96.98%
1
25.00%
Paul Mackerras
5
1.68%
1
25.00%
Michel Lespinasse
2
0.67%
1
25.00%
Peter Zijlstra
2
0.67%
1
25.00%
Total
298
100.00%
4
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
324
80.20%
1
8.33%
David Woodhouse
22
5.45%
1
8.33%
Michel Lespinasse
21
5.20%
2
16.67%
Ingo Molnar
18
4.46%
2
16.67%
David Gibson
7
1.73%
2
16.67%
Paul Mackerras
5
1.24%
1
8.33%
Jeff Dike
3
0.74%
1
8.33%
Peter Zijlstra
2
0.50%
1
8.33%
Nicholas Piggin
2
0.50%
1
8.33%
Total
404
100.00%
12
100.00%
Directory: arch/powerpc/include/asm

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