Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/blackfin/lib/memmove.S
10817 views
1
/*

2
 * Copyright 2005-2009 Analog Devices Inc.

3
 *

4
 * Licensed under the ADI BSD license or the GPL-2 (or later)

5
 */

6


7
#include <linux/linkage.h>

8


9
.align 2

10


11
/*

12
 * C Library function MEMMOVE

13
 * R0 = To Address (leave unchanged to form result)

14
 * R1 = From Address

15
 * R2 = count

16
 * Data may overlap

17
 */

18


19
ENTRY(_memmove)

20
	I1 = P3;

21
	P0 = R0;                  /* P0 = To address */

22
	P3 = R1;                  /* P3 = From Address */

23
	P2 = R2;                  /* P2 = count */

24
	CC = P2 == 0;             /* Check zero count*/

25
	IF CC JUMP .Lfinished;    /* very unlikely */

26


27
	CC = R1 < R0 (IU);        /* From < To */

28
	IF !CC JUMP .Lno_overlap;

29
	R3 = R1 + R2;

30
	CC = R0 <= R3 (IU);       /* (From+len) >= To */

31
	IF CC JUMP .Loverlap;

32
.Lno_overlap:

33
	R3 = 11;

34
	CC = R2 <= R3;

35
	IF CC JUMP .Lbytes;

36
	R3 = R1 | R0;             /* OR addresses together */

37
	R3 <<= 30;                /* check bottom two bits */

38
	CC =  AZ;                 /* AZ set if zero.*/

39
	IF !CC JUMP .Lbytes;      /* Jump if addrs not aligned.*/

40


41
	I0 = P3;

42
	P1 = P2 >> 2;             /* count = n/4 */

43
	P1 += -1;

44
	R3 =  3;

45
	R2 = R2 & R3;             /* remainder */

46
	P2 = R2;                  /* set remainder */

47
	R1 = [I0++];

48


49
	LSETUP (.Lquad_loops, .Lquad_loope) LC0=P1;

50
#if ANOMALY_05000202

51
.Lquad_loops:

52
	[P0++] = R1;

53
.Lquad_loope:

54
	R1 = [I0++];

55
#else

56
.Lquad_loops:

57
.Lquad_loope:

58
	 MNOP || [P0++] = R1 || R1 = [I0++];

59
#endif

60
	[P0++] = R1;

61


62
	CC = P2 == 0;             /* any remaining bytes? */

63
	P3 = I0;                  /* Amend P3 to updated ptr. */

64
	IF !CC JUMP .Lbytes;

65
	P3 = I1;

66
	RTS;

67


68
.Lbytes:     LSETUP (.Lbyte2_s, .Lbyte2_e) LC0=P2;

69
.Lbyte2_s:   R1 = B[P3++](Z);

70
.Lbyte2_e:   B[P0++] = R1;

71


72
.Lfinished:  P3 = I1;

73
	RTS;

74


75
.Loverlap:

76
	P2 += -1;

77
	P0 = P0 + P2;

78
	P3 = P3 + P2;

79
	R1 = B[P3--] (Z);

80
	CC = P2 == 0;

81
	IF CC JUMP .Lno_loop;

82
#if ANOMALY_05000245

83
	NOP;

84
	NOP;

85
#endif

86
	LSETUP (.Lol_s, .Lol_e) LC0 = P2;

87
.Lol_s:    B[P0--] = R1;

88
.Lol_e:    R1 = B[P3--] (Z);

89
.Lno_loop: B[P0] = R1;

90
	P3 = I1;

91
	RTS;

92


93
ENDPROC(_memmove)

94


95