| 1 | /* Out-of-line syscall stub for six-argument syscalls from C. |
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| 2 | Copyright (C) 2015-2022 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 | /* %eax, %ecx, %edx and %esi contain the values expected by the kernel. |
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| 22 | %edi points to a structure with the values of %ebx, %edi and %ebp. */ |
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| 23 | |
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| 24 | .hidden __libc_do_syscall |
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| 25 | |
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| 26 | ENTRY (__libc_do_syscall) |
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| 27 | pushl %ebx |
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| 28 | cfi_adjust_cfa_offset (4) |
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| 29 | cfi_rel_offset (ebx, 0) |
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| 30 | pushl %edi |
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| 31 | cfi_adjust_cfa_offset (4) |
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| 32 | cfi_rel_offset (edi, 0) |
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| 33 | pushl %ebp |
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| 34 | cfi_adjust_cfa_offset (4) |
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| 35 | cfi_rel_offset (ebp, 0) |
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| 36 | movl 0(%edi), %ebx |
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| 37 | movl 8(%edi), %ebp |
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| 38 | movl 4(%edi), %edi |
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| 39 | ENTER_KERNEL |
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| 40 | popl %ebp |
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| 41 | cfi_adjust_cfa_offset (-4) |
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| 42 | cfi_restore (ebp) |
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| 43 | popl %edi |
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| 44 | cfi_adjust_cfa_offset (-4) |
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| 45 | cfi_restore (edi) |
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| 46 | popl %ebx |
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| 47 | cfi_adjust_cfa_offset (-4) |
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| 48 | cfi_restore (ebx) |
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| 49 | ret |
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| 50 | END (__libc_do_syscall) |
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| 51 | |
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