| 1 | /* Copyright (C) 2005-2022 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 | #include <sysdep.h> |
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| 19 | |
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| 20 | /* In the EABI syscall interface, we don't need a special syscall to |
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| 21 | implement syscall(). It won't work reliably with 64-bit arguments |
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| 22 | (but that is true on many modern platforms). */ |
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| 23 | |
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| 24 | ENTRY (syscall) |
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| 25 | mov ip, sp |
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| 26 | push {r4, r5, r6, r7} |
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| 27 | cfi_adjust_cfa_offset (16) |
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| 28 | cfi_rel_offset (r4, 0) |
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| 29 | cfi_rel_offset (r5, 4) |
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| 30 | cfi_rel_offset (r6, 8) |
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| 31 | cfi_rel_offset (r7, 12) |
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| 32 | mov r7, r0 |
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| 33 | mov r0, r1 |
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| 34 | mov r1, r2 |
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| 35 | mov r2, r3 |
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| 36 | ldmfd ip, {r3, r4, r5, r6} |
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| 37 | swi 0x0 |
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| 38 | pop {r4, r5, r6, r7} |
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| 39 | cfi_adjust_cfa_offset (-16) |
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| 40 | cfi_restore (r4) |
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| 41 | cfi_restore (r5) |
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| 42 | cfi_restore (r6) |
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| 43 | cfi_restore (r7) |
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| 44 | cmn r0, #4096 |
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| 45 | it cc |
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| 46 | RETINSTR(cc, lr) |
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| 47 | b PLTJMP(syscall_error) |
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| 48 | PSEUDO_END (syscall) |
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| 49 | |
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