1 | /* Implementation of profiling support. C-SKY ABIV2 version. |
2 | Copyright (C) 2018-2024 Free Software Foundation, Inc. |
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 | <https://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) |
68 | |