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1 | /* Copyright (C) 1996-2019 Free Software Foundation, Inc. |
---|---|

2 | This file is part of the GNU C Library. |

3 | Contributed by Richard Henderson (rth@tamu.edu) |

4 | |

5 | The GNU C Library is free software; you can redistribute it and/or |

6 | modify it under the terms of the GNU Lesser General Public |

7 | License as published by the Free Software Foundation; either |

8 | version 2.1 of the License, or (at your option) any later version. |

9 | |

10 | The GNU C Library is distributed in the hope that it will be useful, |

11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |

12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |

13 | Lesser General Public License for more details. |

14 | |

15 | You should have received a copy of the GNU Lesser General Public |

16 | License along with the GNU C Library. If not, see |

17 | <http://www.gnu.org/licenses/>. */ |

18 | |

19 | /* Copy no more than COUNT bytes of the null-terminated string from |

20 | SRC to DST. If SRC does not cover all of COUNT, the balance is |

21 | zeroed. Return the address of the terminating null in DEST, if |

22 | any, else DEST + COUNT. */ |

23 | |

24 | #include <sysdep.h> |

25 | |

26 | .set noat |

27 | .set noreorder |

28 | |

29 | .text |

30 | |

31 | ENTRY(__stpncpy) |

32 | ldgp gp, 0(pv) |

33 | #ifdef PROF |

34 | lda AT, _mcount |

35 | jsr AT, (AT), _mcount |

36 | #endif |

37 | .prologue 1 |

38 | |

39 | beq a2, $zerocount |

40 | jsr t9, __stxncpy # do the work of the copy |

41 | |

42 | and t8, 0xf0, t3 # binary search for byte offset of the |

43 | and t8, 0xcc, t2 # last byte written. |

44 | and t8, 0xaa, t1 |

45 | andnot a0, 7, v0 |

46 | cmovne t3, 4, t3 |

47 | cmovne t2, 2, t2 |

48 | cmovne t1, 1, t1 |

49 | addq v0, t3, v0 |

50 | addq t1, t2, t1 |

51 | addq v0, t1, v0 |

52 | |

53 | bne a2, $multiword # do we have full words left? |

54 | |

55 | .align 3 |

56 | zapnot t0, t8, t4 # e0 : was last byte a null? |

57 | subq t8, 1, t2 # .. e1 : |

58 | addq v0, 1, t5 # e0 : |

59 | subq t10, 1, t3 # .. e1 : |

60 | or t2, t8, t2 # e0 : clear the bits between the last |

61 | or t3, t10, t3 # .. e1 : written byte and the last byte in |

62 | andnot t3, t2, t3 # e0 : COUNT |

63 | cmovne t4, t5, v0 # .. e1 : if last written wasnt null, inc v0 |

64 | zap t0, t3, t0 # e0 : |

65 | stq_u t0, 0(a0) # e1 : |

66 | ret # .. e1 : |

67 | |

68 | .align 3 |

69 | $multiword: |

70 | subq t8, 1, t7 # e0 : clear the final bits in the prev |

71 | or t7, t8, t7 # e1 : word |

72 | zapnot t0, t7, t0 # e0 : |

73 | subq a2, 1, a2 # .. e1 : |

74 | stq_u t0, 0(a0) # e0 : |

75 | addq a0, 8, a0 # .. e1 : |

76 | |

77 | beq a2, 1f # e1 : |

78 | blbc a2, 0f # e1 : |

79 | |

80 | stq_u zero, 0(a0) # e0 : zero one word |

81 | subq a2, 1, a2 # .. e1 : |

82 | addq a0, 8, a0 # e0 : |

83 | beq a2, 1f # .. e1 : |

84 | |

85 | 0: stq_u zero, 0(a0) # e0 : zero two words |

86 | subq a2, 2, a2 # .. e1 : |

87 | stq_u zero, 8(a0) # e0 : |

88 | addq a0, 16, a0 # .. e1 : |

89 | bne a2, 0b # e1 : |

90 | unop |

91 | |

92 | 1: ldq_u t0, 0(a0) # e0 : clear the leading bits in the final |

93 | subq t10, 1, t7 # .. e1 : word |

94 | or t7, t10, t7 # e0 : |

95 | zap t0, t7, t0 # e1 (stall) |

96 | stq_u t0, 0(a0) # e0 : |

97 | ret # .. e1 : |

98 | |

99 | $zerocount: |

100 | mov a0, v0 |

101 | ret |

102 | |

103 | END(__stpncpy) |

104 | |

105 | libc_hidden_def (__stpncpy) |

106 | weak_alias (__stpncpy, stpncpy) |

107 |

Warning: That file was not part of the compilation database. It may have many parsing errors.