| 1 | /* Copyright (C) 2005-2024 Free Software Foundation, Inc. |
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| 2 | |
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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 | /* syscall (int nr, ...) |
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| 22 | |
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| 23 | AArch64 system calls take between 0 and 7 arguments. On entry here nr |
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| 24 | is in w0 and any other system call arguments are in register x1..x7. |
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| 25 | |
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| 26 | For kernel entry we need to move the system call nr to x8 then |
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| 27 | load the remaining arguments to register. */ |
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| 28 | |
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| 29 | ENTRY (syscall) |
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| 30 | uxtw x8, w0 |
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| 31 | mov x0, x1 |
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| 32 | mov x1, x2 |
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| 33 | mov x2, x3 |
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| 34 | mov x3, x4 |
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| 35 | mov x4, x5 |
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| 36 | mov x5, x6 |
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| 37 | mov x6, x7 |
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| 38 | svc 0x0 |
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| 39 | cmn x0, #4095 |
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| 40 | b.cs 1f |
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| 41 | RET |
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| 42 | 1: |
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| 43 | b SYSCALL_ERROR |
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| 44 | PSEUDO_END (syscall) |
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| 45 | |
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