| 1 | /* Copyright (C) 2010-2024 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library. If not, see |
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| 16 | <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | /* When this file is built for inclusion in nscd, _FORTIFY_SOURCE is |
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| 19 | defined but -O is not used, resulting in a warning from features.h. */ |
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| 20 | #undef _FORTIFY_SOURCE |
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| 21 | #include <sysdep.h> |
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| 22 | |
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| 23 | /* Out-of-line syscall stub. We expect the system call number in ip |
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| 24 | and return the raw result in r0. No registers are clobbered. |
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| 25 | We could avoid using the stack for this, but the goal is accurate |
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| 26 | unwind information - and while there is a reserved prefix in the |
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| 27 | ARM unwind tables for register to register moves, the actual opcodes |
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| 28 | are not defined. */ |
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| 29 | |
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| 30 | #if defined(__thumb__) |
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| 31 | .thumb |
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| 32 | .syntax unified |
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| 33 | .hidden __libc_do_syscall |
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| 34 | |
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| 35 | #undef CALL_MCOUNT |
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| 36 | #define CALL_MCOUNT |
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| 37 | |
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| 38 | ENTRY (__libc_do_syscall) |
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| 39 | .fnstart |
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| 40 | push {r7, lr} |
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| 41 | .save {r7, lr} |
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| 42 | cfi_adjust_cfa_offset (8) |
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| 43 | cfi_rel_offset (r7, 0) |
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| 44 | cfi_rel_offset (lr, 4) |
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| 45 | mov r7, ip |
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| 46 | swi 0x0 |
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| 47 | pop {r7, pc} |
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| 48 | .fnend |
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| 49 | END (__libc_do_syscall) |
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| 50 | |
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| 51 | #endif /* __thumb__ */ |
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| 52 | |
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