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| 1 | # |
1 | # |
| 2 | # Copyright (c) 2007 Jakub Jermar |
2 | # Copyright (c) 2007 Jakub Jermar |
| 3 | # All rights reserved. |
3 | # All rights reserved. |
| 4 | # |
4 | # |
| 5 | # Redistribution and use in source and binary forms, with or without |
5 | # Redistribution and use in source and binary forms, with or without |
| 6 | # modification, are permitted provided that the following conditions |
6 | # modification, are permitted provided that the following conditions |
| 7 | # are met: |
7 | # are met: |
| 8 | # |
8 | # |
| 9 | # - Redistributions of source code must retain the above copyright |
9 | # - Redistributions of source code must retain the above copyright |
| 10 | # notice, this list of conditions and the following disclaimer. |
10 | # notice, this list of conditions and the following disclaimer. |
| 11 | # - Redistributions in binary form must reproduce the above copyright |
11 | # - Redistributions in binary form must reproduce the above copyright |
| 12 | # notice, this list of conditions and the following disclaimer in the |
12 | # notice, this list of conditions and the following disclaimer in the |
| 13 | # documentation and/or other materials provided with the distribution. |
13 | # documentation and/or other materials provided with the distribution. |
| 14 | # - The name of the author may not be used to endorse or promote products |
14 | # - The name of the author may not be used to endorse or promote products |
| 15 | # derived from this software without specific prior written permission. |
15 | # derived from this software without specific prior written permission. |
| 16 | # |
16 | # |
| 17 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 18 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 22 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | # |
27 | # |
| 28 | 28 | ||
| 29 | .text |
29 | .text |
| 30 | 30 | ||
| 31 | /** Syscall wrapper. |
31 | /** Syscall wrapper. |
| 32 | * |
32 | * |
| 33 | * Mind the order of arguments. First two arguments and the syscall number go to |
33 | * Mind the order of arguments. First two arguments and the syscall number go to |
| 34 | * scratch registers. An optimized version of this wrapper for fewer arguments |
34 | * scratch registers. An optimized version of this wrapper for fewer arguments |
| 35 | * could benefit from this and not save unused registers on the stack. |
35 | * could benefit from this and not save unused registers on the stack. |
| 36 | */ |
36 | */ |
| 37 | .global __syscall |
37 | .global __syscall |
| 38 | __syscall: |
38 | __syscall: |
| 39 | pushl %ebx |
39 | pushl %ebx |
| 40 | pushl %esi |
40 | pushl %esi |
| 41 | pushl %edi |
41 | pushl %edi |
| 42 | pushl %ebp |
42 | pushl %ebp |
| 43 | movl 20(%esp), %edx # First argument. |
43 | movl 20(%esp), %edx # First argument. |
| 44 | movl 24(%esp), %ecx # Second argument. |
44 | movl 24(%esp), %ecx # Second argument. |
| 45 | movl 28(%esp), %ebx # Third argument. |
45 | movl 28(%esp), %ebx # Third argument. |
| 46 | movl 32(%esp), %esi # Fourth argument. |
46 | movl 32(%esp), %esi # Fourth argument. |
| 47 | movl 36(%esp), %edi # Fifth argument. |
47 | movl 36(%esp), %edi # Fifth argument. |
| 48 | movl 40(%esp), %ebp # Sixth argument. |
48 | movl 40(%esp), %ebp # Sixth argument. |
| 49 | movl 44(%esp), %eax # Syscall number. |
49 | movl 44(%esp), %eax # Syscall number. |
| 50 | int $0x30 |
50 | int $0x30 |
| 51 | popl %ebp |
51 | popl %ebp |
| 52 | popl %edi |
52 | popl %edi |
| 53 | popl %esi |
53 | popl %esi |
| 54 | popl %ebx |
54 | popl %ebx |
| 55 | ret |
55 | ret |
| 56 | - | ||
| 57 | 56 | ||