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| 1 | # |
1 | # |
| 2 | # Copyright (c) 2001-2004 Jakub Jermar |
2 | # Copyright (c) 2001-2004 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 | #include <arch/context_offset.h> |
29 | #include <arch/context_offset.h> |
| 30 | 30 | ||
| 31 | .text |
31 | .text |
| 32 | 32 | ||
| 33 | .global context_save_arch |
33 | .global context_save_arch |
| 34 | .global context_restore_arch |
34 | .global context_restore_arch |
| 35 | 35 | ||
| 36 | 36 | ||
| 37 | ## Save current CPU context |
37 | ## Save current CPU context |
| 38 | # |
38 | # |
| 39 | # Save CPU context to the context_t variable |
39 | # Save CPU context to the context_t variable |
| 40 | # pointed by the 1st argument. Returns 1 in EAX. |
40 | # pointed by the 1st argument. Returns 1 in EAX. |
| 41 | # |
41 | # |
| 42 | context_save_arch: |
42 | context_save_arch: |
| 43 | movl 0(%esp),%eax # save pc value into eax |
43 | movl 0(%esp),%eax # save pc value into eax |
| 44 | movl 4(%esp),%edx # address of the context variable to save context to |
44 | movl 4(%esp),%edx # address of the context variable to save context to |
| 45 | 45 | ||
| 46 | # save registers to given structure |
46 | # save registers to given structure |
| 47 | CONTEXT_SAVE_ARCH_CORE %edx %eax |
47 | CONTEXT_SAVE_ARCH_CORE %edx %eax |
| 48 | 48 | ||
| 49 | xorl %eax,%eax # context_save returns 1 |
49 | xorl %eax,%eax # context_save returns 1 |
| 50 | incl %eax |
50 | incl %eax |
| 51 | ret |
51 | ret |
| 52 | 52 | ||
| 53 | 53 | ||
| 54 | ## Restore saved CPU context |
54 | ## Restore saved CPU context |
| 55 | # |
55 | # |
| 56 | # Restore CPU context from context_t variable |
56 | # Restore CPU context from context_t variable |
| 57 | # pointed by the 1st argument. Returns 0 in EAX. |
57 | # pointed by the 1st argument. Returns 0 in EAX. |
| 58 | # |
58 | # |
| 59 | context_restore_arch: |
59 | context_restore_arch: |
| 60 | movl 4(%esp),%eax # address of the context variable to restore context from |
60 | movl 4(%esp),%eax # address of the context variable to restore context from |
| 61 | 61 | ||
| 62 | # restore registers from given structure |
62 | # restore registers from given structure |
| 63 | CONTEXT_RESTORE_ARCH_CORE %eax %edx |
63 | CONTEXT_RESTORE_ARCH_CORE %eax %edx |
| 64 | 64 | ||
| 65 | movl %edx,0(%esp) # put saved pc on stack |
65 | movl %edx,0(%esp) # put saved pc on stack |
| 66 | xorl %eax,%eax # context_restore returns 0 |
66 | xorl %eax,%eax # context_restore returns 0 |
| 67 | ret |
67 | ret |
| 68 | 68 | ||