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5f72b005 | 1 | /* Implementation of profiling support. C-SKY ABIV2 version. |
04277e02 | 2 | Copyright (C) 2018-2019 Free Software Foundation, Inc. |
5f72b005 MH |
3 | This file is part of the GNU C Library. |
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 | #include <sysdep.h> | |
20 | ||
21 | /* Use an assembly stub with a special ABI. The calling lr has been | |
22 | pushed to the stack (which will be misaligned). We should preserve | |
23 | all registers except ip and pop a word off the stack. | |
24 | ||
25 | NOTE: This assumes mcount_internal does not clobber any non-core | |
26 | (coprocessor) registers. Currently this is true, but may require | |
27 | additional attention in the future. | |
28 | ||
29 | The calling sequence looks something like: | |
30 | func: | |
31 | push lr | |
32 | jbsr _mount | |
33 | <function body> | |
34 | */ | |
35 | ||
36 | /* Don't call mcount when calling mcount... */ | |
37 | #undef PROF | |
38 | ||
39 | ENTRY (_mcount) | |
40 | subi sp, 20 | |
41 | stw a0, (sp, 0) | |
42 | stw a1, (sp, 4) | |
43 | stw a2, (sp, 8) | |
44 | stw a3, (sp, 12) | |
45 | stw lr, (sp, 16) | |
46 | mov a1, lr | |
47 | ldw a0, (sp, 20) | |
48 | #ifdef __PIC__ | |
49 | grs t1, .Lgetpc | |
50 | .Lgetpc: | |
51 | lrw t0, .Lgetpc@GOTPC | |
52 | addu t1, t0 | |
53 | lrw t0, __mcount_internal@PLT | |
54 | ldr.w t0, (t1, t0 << 0) | |
55 | jsr t0 | |
56 | #else | |
57 | jsri __mcount_internal | |
58 | #endif /* !__PIC__ */ | |
59 | ldw a0, (sp, 0) | |
60 | ldw a1, (sp, 4) | |
61 | ldw a2, (sp, 8) | |
62 | ldw a3, (sp, 12) | |
63 | ldw t1, (sp, 16) | |
64 | ldw lr, (sp, 20) | |
65 | addi sp, 24 | |
66 | jmp t1 | |
67 | END (_mcount) |