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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 | #include <kernel/arch/context_offset.h> |
34 | #include <kernel/arch/context_offset.h> |
35 | 35 | ||
36 | ## Save current CPU context |
36 | ## Save current CPU context |
37 | # |
37 | # |
38 | # Save CPU context to context_t variable |
38 | # Save CPU context to context_t variable |
39 | # pointed by the 1st argument. Returns 1 in EAX. |
39 | # pointed by the 1st argument. Returns 1 in EAX. |
40 | # |
40 | # |
41 | context_save: |
41 | context_save: |
42 | movq (%rsp), %rdx # the caller's return %eip |
42 | movq (%rsp), %rdx # the caller's return %eip |
43 | 43 | ||
44 | # In %edi is passed 1st argument |
44 | # In %edi is passed 1st argument |
45 | CONTEXT_SAVE_ARCH_CORE %rdi %rdx |
45 | CONTEXT_SAVE_ARCH_CORE %rdi %rdx |
46 | 46 | ||
47 | # Save TLS |
47 | # Save TLS |
48 | movq %fs:0, %rax |
48 | movq %fs:0, %rax |
49 | movq %rax, OFFSET_TLS(%rdi) |
49 | movq %rax, OFFSET_TLS(%rdi) |
50 | 50 | ||
51 | xorq %rax,%rax # context_save returns 1 |
51 | xorq %rax,%rax # context_save returns 1 |
52 | incq %rax |
52 | incq %rax |
53 | ret |
53 | ret |
54 | 54 | ||
55 | 55 | ||
56 | ## Restore current CPU context |
56 | ## Restore current 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: |
61 | context_restore: |
62 | 62 | ||
63 | CONTEXT_RESTORE_ARCH_CORE %rdi %rdx |
63 | CONTEXT_RESTORE_ARCH_CORE %rdi %rdx |
64 | 64 | ||
65 | movq %rdx,(%rsp) |
65 | movq %rdx,(%rsp) |
66 | 66 | ||
67 | # Set thread local storage |
67 | # Set thread local storage |
68 | movq OFFSET_TLS(%rdi), %rdi # Set arg1 to TLS addr |
68 | movq OFFSET_TLS(%rdi), %rdi # Set arg1 to TLS addr |
69 | movq $1, %rax # SYS_TLS_SET |
69 | movq $1, %rax # SYS_TLS_SET |
70 | syscall |
70 | syscall |
71 | 71 | ||
72 | xorq %rax,%rax # context_restore returns 0 |
72 | xorq %rax,%rax # context_restore returns 0 |
73 | ret |
73 | ret |
74 | 74 |