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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 | .text |
29 | .text |
30 | 30 | ||
31 | .global context_save_arch |
31 | .global context_save_arch |
32 | .global context_restore_arch |
32 | .global context_restore_arch |
33 | 33 | ||
34 | 34 | ||
35 | ## Save current CPU context |
35 | ## Save current CPU context |
36 | # |
36 | # |
37 | # Save CPU context to the context_t variable |
37 | # Save CPU context to the context_t variable |
38 | # pointed by the 1st argument. Returns 1 in EAX. |
38 | # pointed by the 1st argument. Returns 1 in EAX. |
39 | # |
39 | # |
40 | context_save_arch: |
40 | context_save_arch: |
41 | movl 0(%esp),%eax # the caller's return %eip |
41 | movl 0(%esp),%eax # the caller's return %eip |
42 | movl 4(%esp),%edx # address of the kernel_context variable to save context to |
42 | movl 4(%esp),%edx # address of the kernel_context variable to save context to |
43 | 43 | ||
44 | movl %esp,0(%edx) # %esp -> ctx->sp |
44 | movl %esp,0(%edx) # %esp -> ctx->sp |
45 | movl %eax,4(%edx) # %eip -> ctx->pc |
45 | movl %eax,4(%edx) # %eip -> ctx->pc |
46 | movl %ebx,8(%edx) # %ebx -> ctx->ebx |
46 | movl %ebx,8(%edx) # %ebx -> ctx->ebx |
47 | movl %esi,12(%edx) # %esi -> ctx->esi |
47 | movl %esi,12(%edx) # %esi -> ctx->esi |
48 | movl %edi,16(%edx) # %edi -> ctx->edi |
48 | movl %edi,16(%edx) # %edi -> ctx->edi |
49 | movl %ebp,20(%edx) # %ebp -> ctx->ebp |
49 | movl %ebp,20(%edx) # %ebp -> ctx->ebp |
50 | 50 | ||
51 | xorl %eax,%eax # context_save returns 1 |
51 | xorl %eax,%eax # context_save returns 1 |
52 | incl %eax |
52 | incl %eax |
53 | ret |
53 | ret |
54 | 54 | ||
55 | 55 | ||
56 | ## Restore saved CPU context |
56 | ## Restore saved CPU context |
57 | # |
57 | # |
58 | # Restore CPU context from context_t variable |
58 | # Restore CPU context from context_t variable |
59 | # pointed by the 1st argument. Returns 0 in EAX. |
59 | # pointed by the 1st argument. Returns 0 in EAX. |
60 | # |
60 | # |
61 | context_restore_arch: |
61 | context_restore_arch: |
62 | movl 4(%esp),%eax # address of the kernel_context variable to restore context from |
62 | movl 4(%esp),%eax # address of the kernel_context variable to restore context from |
63 | movl 0(%eax),%esp # ctx->sp -> %esp |
63 | movl 0(%eax),%esp # ctx->sp -> %esp |
64 | movl 4(%eax),%edx # ctx->pc -> %edx |
64 | movl 4(%eax),%edx # ctx->pc -> %edx |
65 | movl 8(%eax),%ebx # ctx->ebx -> %ebx |
65 | movl 8(%eax),%ebx # ctx->ebx -> %ebx |
66 | movl 12(%eax),%esi # ctx->esi -> %esi |
66 | movl 12(%eax),%esi # ctx->esi -> %esi |
67 | movl 16(%eax),%edi # ctx->edi -> %edi |
67 | movl 16(%eax),%edi # ctx->edi -> %edi |
68 | movl 20(%eax),%ebp # ctx->ebp -> %ebp |
68 | movl 20(%eax),%ebp # ctx->ebp -> %ebp |
69 | 69 | ||
70 | movl %edx,0(%esp) # ctx->pc -> saver's return %eip |
70 | movl %edx,0(%esp) # ctx->pc -> saver's return %eip |
71 | xorl %eax,%eax # context_restore returns 0 |
71 | xorl %eax,%eax # context_restore returns 0 |
72 | ret |
72 | ret |
73 | 73 | ||
74 | 74 | ||
75 |
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75 |
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76 | 76 | ||
77 | 77 | ||
78 | 78 |