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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 |
31 | .global context_save |
32 | .global context_restore |
32 | .global context_restore |
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: |
40 | context_save: |
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 context variable to save context to |
42 | movl 4(%esp),%edx # address of the 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 | # Save TLS |
51 | # Save TLS |
52 | movl %gs:0, %eax |
52 | movl %gs:0, %eax |
53 | movl %eax, 24(%edx) # tls -> ctx->tls |
53 | movl %eax, 24(%edx) # tls -> ctx->tls |
54 | 54 | ||
55 | xorl %eax,%eax # context_save returns 1 |
55 | xorl %eax,%eax # context_save returns 1 |
56 | incl %eax |
56 | incl %eax |
57 | ret |
57 | ret |
58 | 58 | ||
59 | 59 | ||
60 | ## Restore saved CPU context |
60 | ## Restore saved CPU context |
61 | # |
61 | # |
62 | # Restore CPU context from context_t variable |
62 | # Restore CPU context from context_t variable |
63 | # pointed by the 1st argument. Returns 0 in EAX. |
63 | # pointed by the 1st argument. Returns 0 in EAX. |
64 | # |
64 | # |
65 | context_restore: |
65 | context_restore: |
66 | movl 4(%esp),%eax # address of the context variable to restore context from |
66 | movl 4(%esp),%eax # address of the context variable to restore context from |
67 | movl 0(%eax),%esp # ctx->sp -> %esp |
67 | movl 0(%eax),%esp # ctx->sp -> %esp |
68 | movl 4(%eax),%edx # ctx->pc -> %edx |
68 | movl 4(%eax),%edx # ctx->pc -> %edx |
69 | movl 8(%eax),%ebx # ctx->ebx -> %ebx |
69 | movl 8(%eax),%ebx # ctx->ebx -> %ebx |
70 | movl 12(%eax),%esi # ctx->esi -> %esi |
70 | movl 12(%eax),%esi # ctx->esi -> %esi |
71 | movl 16(%eax),%edi # ctx->edi -> %edi |
71 | movl 16(%eax),%edi # ctx->edi -> %edi |
72 | movl 20(%eax),%ebp # ctx->ebp -> %ebp |
72 | movl 20(%eax),%ebp # ctx->ebp -> %ebp |
73 | 73 | ||
74 | movl %edx,0(%esp) # ctx->pc -> saver's return %eip |
74 | movl %edx,0(%esp) # ctx->pc -> saver's return %eip |
75 | 75 | ||
76 | # Set thread local storage |
76 | # Set thread local storage |
77 | pushl %edi |
77 | pushl %edx |
78 | movl 24(%eax), %eax # Set arg1 to TLS addr |
78 | movl 24(%eax), %edx # Set arg1 to TLS addr |
79 | movl $1, %edi # Syscall 1 |
79 | movl $1, %eax # Syscall SYS_TLS_SET |
80 | int $0x30 |
80 | int $0x30 |
81 | popl %edi |
81 | popl %edx |
82 | 82 | ||
83 | xorl %eax,%eax # context_restore returns 0 |
83 | xorl %eax,%eax # context_restore returns 0 |
84 | ret |
84 | ret |
85 | 85 |