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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 | #include <arch/context_offset.h> |
34 | #include <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_arch: |
41 | context_save_arch: |
42 | movq (%rsp), %rdx # the caller's return %eip |
42 | movq (%rsp), %rdx # the caller's return %eip |
43 | # In %edi is passed 1st argument |
43 | # In %edi is passed 1st argument |
44 | movq %rdx, OFFSET_PC(%rdi) |
44 | movq %rdx, OFFSET_PC(%rdi) |
45 | movq %rsp, OFFSET_SP(%rdi) |
45 | movq %rsp, OFFSET_SP(%rdi) |
46 | 46 | ||
47 | movq %rbx, OFFSET_RBX(%rdi) |
47 | movq %rbx, OFFSET_RBX(%rdi) |
48 | movq %rbp, OFFSET_RBP(%rdi) |
48 | movq %rbp, OFFSET_RBP(%rdi) |
49 | movq %r12, OFFSET_R12(%rdi) |
49 | movq %r12, OFFSET_R12(%rdi) |
50 | movq %r13, OFFSET_R13(%rdi) |
50 | movq %r13, OFFSET_R13(%rdi) |
51 | movq %r14, OFFSET_R14(%rdi) |
51 | movq %r14, OFFSET_R14(%rdi) |
52 | movq %r15, OFFSET_R15(%rdi) |
52 | movq %r15, OFFSET_R15(%rdi) |
53 | 53 | ||
54 | xorq %rax,%rax # context_save returns 1 |
54 | xorq %rax,%rax # context_save returns 1 |
55 | incq %rax |
55 | incq %rax |
56 | ret |
56 | ret |
57 | 57 | ||
58 | 58 | ||
59 | ## Restore current CPU context |
59 | ## Restore current CPU context |
60 | # |
60 | # |
61 | # Restore CPU context from context_t variable |
61 | # Restore CPU context from context_t variable |
62 | # pointed by the 1st argument. Returns 0 in EAX. |
62 | # pointed by the 1st argument. Returns 0 in EAX. |
63 | # |
63 | # |
64 | context_restore_arch: |
64 | context_restore_arch: |
65 | movq OFFSET_R15(%rdi), %r15 |
65 | movq OFFSET_R15(%rdi), %r15 |
66 | movq OFFSET_R14(%rdi), %r14 |
66 | movq OFFSET_R14(%rdi), %r14 |
67 | movq OFFSET_R13(%rdi), %r13 |
67 | movq OFFSET_R13(%rdi), %r13 |
68 | movq OFFSET_R12(%rdi), %r12 |
68 | movq OFFSET_R12(%rdi), %r12 |
69 | movq OFFSET_RBP(%rdi), %rbp |
69 | movq OFFSET_RBP(%rdi), %rbp |
70 | movq OFFSET_RBX(%rdi), %rbx |
70 | movq OFFSET_RBX(%rdi), %rbx |
71 | 71 | ||
72 | movq OFFSET_SP(%rdi), %rsp # ctx->sp -> %rsp |
72 | movq OFFSET_SP(%rdi), %rsp # ctx->sp -> %rsp |
73 | 73 | ||
74 | movq OFFSET_PC(%rdi), %rdx |
74 | movq OFFSET_PC(%rdi), %rdx |
75 | movq %rdx,(%rsp) |
75 | movq %rdx,(%rsp) |
76 | 76 | ||
77 | xorq %rax,%rax # context_restore returns 0 |
77 | xorq %rax,%rax # context_restore returns 0 |
78 | ret |
78 | ret |
79 | 79 | ||
80 | 80 | ||
81 |
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81 |
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82 | 82 | ||
83 | 83 | ||
84 | 84 |