| 1 | /* _Unwind_Resume wrapper for ARM EABI. |
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| 2 | Copyright (C) 2015-2024 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 License as |
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| 7 | published by the Free Software Foundation; either version 2.1 of the |
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| 8 | 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 | /* This is equivalent to the following C implementation: |
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| 22 | |
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| 23 | void |
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| 24 | _Unwind_Resume (struct _Unwind_Exception *exc) |
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| 25 | { |
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| 26 | __unwind_link_get_resume () (exc); |
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| 27 | } |
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| 28 | |
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| 29 | We do it in assembly just to ensure that we get an unmolested tail |
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| 30 | call to the libgcc function, which is necessary for the ARM unwinder. */ |
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| 31 | |
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| 32 | ENTRY (_Unwind_Resume) |
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| 33 | /* We need to save and restore LR (for our own return address) |
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| 34 | and R0 (for the argument to _Unwind_Resume) around the call. */ |
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| 35 | push {r0, lr} |
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| 36 | cfi_adjust_cfa_offset (8) |
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| 37 | cfi_rel_offset (r0, 0) |
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| 38 | cfi_rel_offset (lr, 4) |
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| 39 | bl __unwind_link_get_resume |
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| 40 | mov r3, r0 |
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| 41 | pop {r0, lr} |
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| 42 | cfi_adjust_cfa_offset (-8) |
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| 43 | cfi_restore (r4) |
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| 44 | cfi_restore (lr) |
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| 45 | bx r3 |
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| 46 | END (_Unwind_Resume) |
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| 47 | |
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