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Commit | Line | Data |
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432a73f7 UD |
1 | /* Copy memory block and return pointer to beginning of destination block |
2 | For Intel 80x86, x>=6. | |
3 | This file is part of the GNU C Library. | |
04277e02 | 4 | Copyright (C) 2003-2019 Free Software Foundation, Inc. |
432a73f7 UD |
5 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 2003. |
6 | ||
7 | The GNU C Library is free software; you can redistribute it and/or | |
8 | modify it under the terms of the GNU Lesser General Public | |
9 | License as published by the Free Software Foundation; either | |
10 | version 2.1 of the License, or (at your option) any later version. | |
11 | ||
12 | The GNU C Library is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 PE |
18 | License along with the GNU C Library; if not, see |
19 | <http://www.gnu.org/licenses/>. */ | |
432a73f7 UD |
20 | |
21 | #include <sysdep.h> | |
22 | #include "asm-syntax.h" | |
432a73f7 | 23 | |
2366713d | 24 | #define PARMS 4+4 /* one spilled register */ |
432a73f7 | 25 | #define RTN PARMS |
432a73f7 UD |
26 | |
27 | .text | |
3af48cbd L |
28 | |
29 | #ifdef USE_AS_BCOPY | |
2366713d JM |
30 | # define SRC RTN |
31 | # define DEST SRC+4 | |
32 | # define LEN DEST+4 | |
3af48cbd | 33 | #else |
2366713d JM |
34 | # define DEST RTN |
35 | # define SRC DEST+4 | |
36 | # define LEN SRC+4 | |
3af48cbd | 37 | |
4f41c682 | 38 | # if defined PIC && IS_IN (libc) |
3af48cbd | 39 | ENTRY_CHK (__memmove_chk) |
b5cc329c UD |
40 | movl 12(%esp), %eax |
41 | cmpl %eax, 16(%esp) | |
42 | jb HIDDEN_JUMPTARGET (__chk_fail) | |
3af48cbd L |
43 | END_CHK (__memmove_chk) |
44 | # endif | |
b5cc329c | 45 | #endif |
3af48cbd | 46 | |
2366713d | 47 | ENTRY (memmove) |
432a73f7 UD |
48 | |
49 | pushl %edi | |
1ad9da69 | 50 | cfi_adjust_cfa_offset (4) |
432a73f7 UD |
51 | |
52 | movl LEN(%esp), %ecx | |
53 | movl DEST(%esp), %edi | |
1ad9da69 | 54 | cfi_rel_offset (edi, 0) |
432a73f7 UD |
55 | movl %esi, %edx |
56 | movl SRC(%esp), %esi | |
1ad9da69 | 57 | cfi_register (esi, edx) |
432a73f7 UD |
58 | |
59 | movl %edi, %eax | |
60 | subl %esi, %eax | |
66671c84 YK |
61 | cmpl %eax, %ecx |
62 | ja 3f | |
432a73f7 UD |
63 | |
64 | cld | |
65 | shrl $1, %ecx | |
66 | jnc 1f | |
67 | movsb | |
68 | 1: shrl $1, %ecx | |
69 | jnc 2f | |
70 | movsw | |
71 | 2: rep | |
72 | movsl | |
73 | movl %edx, %esi | |
1ad9da69 | 74 | cfi_restore (esi) |
3af48cbd | 75 | #ifndef USE_AS_BCOPY |
432a73f7 | 76 | movl DEST(%esp), %eax |
3af48cbd | 77 | #endif |
432a73f7 UD |
78 | |
79 | popl %edi | |
1ad9da69 UD |
80 | cfi_adjust_cfa_offset (-4) |
81 | cfi_restore (edi) | |
432a73f7 | 82 | |
2366713d | 83 | ret |
432a73f7 | 84 | |
fee732e5 UD |
85 | cfi_adjust_cfa_offset (4) |
86 | cfi_rel_offset (edi, 0) | |
87 | cfi_register (esi, edx) | |
88 | ||
432a73f7 UD |
89 | /* Backward copying. */ |
90 | 3: std | |
91 | leal -1(%edi, %ecx), %edi | |
92 | leal -1(%esi, %ecx), %esi | |
93 | shrl $1, %ecx | |
94 | jnc 1f | |
95 | movsb | |
96 | 1: subl $1, %edi | |
97 | subl $1, %esi | |
98 | shrl $1, %ecx | |
99 | jnc 2f | |
100 | movsw | |
101 | 2: subl $2, %edi | |
102 | subl $2, %esi | |
103 | rep | |
104 | movsl | |
105 | movl %edx, %esi | |
1ad9da69 | 106 | cfi_restore (esi) |
3af48cbd | 107 | #ifndef USE_AS_BCOPY |
432a73f7 | 108 | movl DEST(%esp), %eax |
3af48cbd | 109 | #endif |
432a73f7 UD |
110 | |
111 | cld | |
112 | popl %edi | |
1ad9da69 UD |
113 | cfi_adjust_cfa_offset (-4) |
114 | cfi_restore (edi) | |
432a73f7 | 115 | |
2366713d JM |
116 | ret |
117 | END (memmove) | |
3af48cbd | 118 | #ifndef USE_AS_BCOPY |
85dd1003 | 119 | libc_hidden_builtin_def (memmove) |
3af48cbd | 120 | #endif |