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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 - INT $0x30 version. |
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_int |
38 | __syscall: |
38 | __syscall_int: |
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 | 56 | ||
- | 57 | ||
- | 58 | /** Syscall wrapper - SYSENTER version. |
|
- | 59 | * |
|
- | 60 | * This is an optimized version of syscall for four or less arguments. Note |
|
- | 61 | * that EBP and EDI are used to remember user stack address and the return |
|
- | 62 | * address. The kernel part doesn't save DS, ES and FS so the handler restores |
|
- | 63 | * these to the selector immediately following CS (it must be the flat data |
|
- | 64 | * segment, otherwise the SYSENTER wouldn't work in the first place). |
|
- | 65 | */ |
|
- | 66 | .global __syscall_sysenter |
|
- | 67 | __syscall_sysenter: |
|
- | 68 | pushl %ebx |
|
- | 69 | pushl %esi |
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- | 70 | pushl %edi |
|
- | 71 | pushl %ebp |
|
- | 72 | mov %esp, %ebp |
|
- | 73 | lea ra, %edi |
|
- | 74 | movl 20(%esp), %edx # First argument. |
|
- | 75 | movl 24(%esp), %ecx # Second argument. |
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- | 76 | movl 28(%esp), %ebx # Third argument. |
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- | 77 | movl 32(%esp), %esi # Fourth argument. |
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- | 78 | movl 44(%esp), %eax # Syscall number. |
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- | 79 | sysenter |
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- | 80 | ra: |
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- | 81 | movw %cs, %cx |
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- | 82 | addw $8, %cx |
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- | 83 | movw %cx, %ds |
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- | 84 | movw %cx, %es |
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- | 85 | movw %cx, %fs |
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- | 86 | popl %ebp |
|
- | 87 | popl %edi |
|
- | 88 | popl %esi |
|
- | 89 | popl %ebx |
|
- | 90 | ret |
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57 | 91 | ||
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