| 1 | /* Implementation of profiling support. C-SKY ABIV2 version. |
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| 2 | Copyright (C) 2018-2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library. If not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <sysdep.h> |
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| 20 | |
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| 21 | /* Use an assembly stub with a special ABI. The calling lr has been |
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| 22 | pushed to the stack (which will be misaligned). We should preserve |
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| 23 | all registers except ip and pop a word off the stack. |
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| 24 | |
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| 25 | NOTE: This assumes mcount_internal does not clobber any non-core |
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| 26 | (coprocessor) registers. Currently this is true, but may require |
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| 27 | additional attention in the future. |
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| 28 | |
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| 29 | The calling sequence looks something like: |
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| 30 | func: |
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| 31 | push lr |
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| 32 | jbsr _mount |
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| 33 | <function body> |
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| 34 | */ |
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| 35 | |
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| 36 | /* Don't call mcount when calling mcount... */ |
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| 37 | #undef PROF |
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| 38 | |
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| 39 | ENTRY (_mcount) |
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| 40 | subi sp, 20 |
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| 41 | stw a0, (sp, 0) |
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| 42 | stw a1, (sp, 4) |
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| 43 | stw a2, (sp, 8) |
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| 44 | stw a3, (sp, 12) |
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| 45 | stw lr, (sp, 16) |
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| 46 | mov a1, lr |
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| 47 | ldw a0, (sp, 20) |
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| 48 | #ifdef __PIC__ |
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| 49 | grs t1, .Lgetpc |
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| 50 | .Lgetpc: |
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| 51 | lrw t0, .Lgetpc@GOTPC |
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| 52 | addu t1, t0 |
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| 53 | lrw t0, __mcount_internal@PLT |
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| 54 | ldr.w t0, (t1, t0 << 0) |
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| 55 | jsr t0 |
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| 56 | #else |
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| 57 | jsri __mcount_internal |
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| 58 | #endif /* !__PIC__ */ |
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| 59 | ldw a0, (sp, 0) |
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| 60 | ldw a1, (sp, 4) |
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| 61 | ldw a2, (sp, 8) |
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| 62 | ldw a3, (sp, 12) |
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| 63 | ldw t1, (sp, 16) |
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| 64 | ldw lr, (sp, 20) |
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| 65 | addi sp, 24 |
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| 66 | jmp t1 |
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| 67 | END (_mcount) |
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| 68 | |
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