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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 <libarch/context_offset.h> |
34 | #include <libarch/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 | # 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 | # Save TLS |
54 | # Save TLS |
55 | movq %fs:0, %rax |
55 | movq %fs:0, %rax |
56 | movq %rax, OFFSET_TLS(%rdi) |
56 | movq %rax, OFFSET_TLS(%rdi) |
57 | 57 | ||
58 | xorq %rax,%rax # context_save returns 1 |
58 | xorq %rax,%rax # context_save returns 1 |
59 | incq %rax |
59 | incq %rax |
60 | ret |
60 | ret |
61 | 61 | ||
62 | 62 | ||
63 | ## Restore current CPU context |
63 | ## Restore current CPU context |
64 | # |
64 | # |
65 | # Restore CPU context from context_t variable |
65 | # Restore CPU context from context_t variable |
66 | # pointed by the 1st argument. Returns 0 in EAX. |
66 | # pointed by the 1st argument. Returns 0 in EAX. |
67 | # |
67 | # |
68 | context_restore: |
68 | context_restore: |
69 | movq OFFSET_R15(%rdi), %r15 |
69 | movq OFFSET_R15(%rdi), %r15 |
70 | movq OFFSET_R14(%rdi), %r14 |
70 | movq OFFSET_R14(%rdi), %r14 |
71 | movq OFFSET_R13(%rdi), %r13 |
71 | movq OFFSET_R13(%rdi), %r13 |
72 | movq OFFSET_R12(%rdi), %r12 |
72 | movq OFFSET_R12(%rdi), %r12 |
73 | movq OFFSET_RBP(%rdi), %rbp |
73 | movq OFFSET_RBP(%rdi), %rbp |
74 | movq OFFSET_RBX(%rdi), %rbx |
74 | movq OFFSET_RBX(%rdi), %rbx |
75 | 75 | ||
76 | movq OFFSET_SP(%rdi), %rsp # ctx->sp -> %rsp |
76 | movq OFFSET_SP(%rdi), %rsp # ctx->sp -> %rsp |
77 | 77 | ||
78 | movq OFFSET_PC(%rdi), %rdx |
78 | movq OFFSET_PC(%rdi), %rdx |
79 | movq %rdx,(%rsp) |
79 | movq %rdx,(%rsp) |
80 | 80 | ||
81 | # Set thread local storage |
81 | # Set thread local storage |
82 | movq OFFSET_TLS(%rdi), %rdi # Set arg1 to TLS addr |
82 | movq OFFSET_TLS(%rdi), %rdi # Set arg1 to TLS addr |
83 | movq $1, %r8 |
83 | movq $1, %r8 |
84 | syscall |
84 | syscall |
85 | 85 | ||
86 | xorq %rax,%rax # context_restore returns 0 |
86 | xorq %rax,%rax # context_restore returns 0 |
87 | ret |
87 | ret |
88 | 88 | ||
89 | 89 | ||
90 |
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90 |
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91 | 91 | ||
92 | 92 | ||
93 | 93 |