Linux Kernel  3.7.1
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bitops.h
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1 #include <asm/unwind.h>
2 
3 #if __LINUX_ARM_ARCH__ >= 6
4  .macro bitop, name, instr
5 ENTRY( \name )
6 UNWIND( .fnstart )
7  ands ip, r1, #3
8  strneb r1, [ip] @ assert word-aligned
9  mov r2, #1
10  and r3, r0, #31 @ Get bit offset
11  mov r0, r0, lsr #5
12  add r1, r1, r0, lsl #2 @ Get word offset
13  mov r3, r2, lsl r3
14 1: ldrex r2, [r1]
15  \instr r2, r2, r3
16  strex r0, r2, [r1]
17  cmp r0, #0
18  bne 1b
19  bx lr
20 UNWIND( .fnend )
21 ENDPROC(\name )
22  .endm
23 
24  .macro testop, name, instr, store
25 ENTRY( \name )
26 UNWIND( .fnstart )
27  ands ip, r1, #3
28  strneb r1, [ip] @ assert word-aligned
29  mov r2, #1
30  and r3, r0, #31 @ Get bit offset
31  mov r0, r0, lsr #5
32  add r1, r1, r0, lsl #2 @ Get word offset
33  mov r3, r2, lsl r3 @ create mask
34  smp_dmb
35 1: ldrex r2, [r1]
36  ands r0, r2, r3 @ save old value of bit
37  \instr r2, r2, r3 @ toggle bit
38  strex ip, r2, [r1]
39  cmp ip, #0
40  bne 1b
41  smp_dmb
42  cmp r0, #0
43  movne r0, #1
44 2: bx lr
45 UNWIND( .fnend )
46 ENDPROC(\name )
47  .endm
48 #else
49  .macro bitop, name, instr
50 ENTRY( \name )
51 UNWIND( .fnstart )
52  ands ip, r1, #3
53  strneb r1, [ip] @ assert word-aligned
54  and r2, r0, #31
55  mov r0, r0, lsr #5
56  mov r3, #1
57  mov r3, r3, lsl r2
58  save_and_disable_irqs ip
59  ldr r2, [r1, r0, lsl #2]
60  \instr r2, r2, r3
61  str r2, [r1, r0, lsl #2]
62  restore_irqs ip
63  mov pc, lr
64 UNWIND( .fnend )
65 ENDPROC(\name )
66  .endm
67 
76  .macro testop, name, instr, store
77 ENTRY( \name )
78 UNWIND( .fnstart )
79  ands ip, r1, #3
80  strneb r1, [ip] @ assert word-aligned
81  and r3, r0, #31
82  mov r0, r0, lsr #5
83  save_and_disable_irqs ip
84  ldr r2, [r1, r0, lsl #2]!
85  mov r0, #1
86  tst r2, r0, lsl r3
87  \instr r2, r2, r0, lsl r3
88  \store r2, [r1]
89  moveq r0, #0
90  restore_irqs ip
91  mov pc, lr
92 UNWIND( .fnend )
93 ENDPROC(\name )
94  .endm
95 #endif
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