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2493e718 | 1 | /* Windows i386 support code for fibers and multithreading. |
8d9254fc | 2 | Copyright (C) 2019-2020 Free Software Foundation, Inc. |
2493e718 IB |
3 | |
4 | This file is part of GCC. | |
5 | ||
6 | GCC is free software; you can redistribute it and/or modify it under | |
7 | the terms of the GNU General Public License as published by the Free | |
8 | Software Foundation; either version 3, or (at your option) any later | |
9 | version. | |
10 | ||
11 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
14 | for more details. | |
15 | ||
16 | Under Section 7 of GPL version 3, you are granted additional | |
17 | permissions described in the GCC Runtime Library Exception, version | |
18 | 3.1, as published by the Free Software Foundation. | |
19 | ||
20 | You should have received a copy of the GNU General Public License and | |
21 | a copy of the GCC Runtime Library Exception along with this program; | |
22 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
23 | <http://www.gnu.org/licenses/>. */ | |
24 | ||
25 | #include "../common/threadasm.S" | |
26 | ||
27 | #if defined(__x86_64__) | |
28 | ||
29 | .text | |
30 | .globl CSYM(fiber_switchContext) | |
31 | .type CSYM(fiber_switchContext), @function | |
32 | .align 16 | |
33 | CSYM(fiber_switchContext): | |
34 | .cfi_startproc | |
35 | pushq %RBP; | |
36 | movq %RSP, %RBP; | |
37 | pushq %RBX; | |
38 | pushq %R12; | |
39 | pushq %R13; | |
40 | pushq %R14; | |
41 | pushq %R15; | |
42 | pushq %GS:0; | |
43 | pushq %GS:8; | |
44 | pushq %GS:16; | |
45 | ||
46 | // store oldp | |
47 | movq %RSP, (%RCX); | |
48 | // load newp to begin context switch | |
49 | movq %RDX, %RSP; | |
50 | ||
51 | // load saved state from new stack | |
52 | popq %GS:16; | |
53 | popq %GS:8; | |
54 | popq %GS:0; | |
55 | popq %R15; | |
56 | popq %R14; | |
57 | popq %R13; | |
58 | popq %R12; | |
59 | popq %RBX; | |
60 | popq %RBP; | |
61 | ||
62 | // 'return' to complete switch | |
63 | popq %RCX; | |
64 | jmp *%RCX; | |
65 | .cfi_endproc | |
66 | .size CSYM(fiber_switchContext),.-CSYM(fiber_switchContext) | |
67 | ||
68 | #elif defined(_X86_) | |
69 | ||
70 | .text | |
71 | .globl CSYM(fiber_switchContext) | |
72 | .type CSYM(fiber_switchContext), @function | |
73 | .align 16 | |
74 | CSYM(fiber_switchContext): | |
75 | .cfi_startproc | |
76 | // Save current stack state.save current stack state | |
77 | // Standard CDECL prologue. | |
78 | push %EBP; | |
79 | mov %ESP, %EBP; | |
80 | push %EDI; | |
81 | push %ESI; | |
82 | push %EBX; | |
83 | push %FS:0; | |
84 | push %FS:4; | |
85 | push %FS:8; | |
86 | push %EAX; | |
87 | ||
88 | // store oldp again with more accurate address | |
89 | mov 8(%EBP), %EAX; | |
90 | mov %ESP, (%EAX); | |
91 | // load newp to begin context switch | |
92 | mov 12(%EBP), %ESP; | |
93 | ||
94 | // load saved state from new stack | |
95 | pop %EAX; | |
96 | pop %FS:8; | |
97 | pop %FS:4; | |
98 | pop %FS:0; | |
99 | pop %EBX; | |
100 | pop %ESI; | |
101 | pop %EDI; | |
102 | pop %EBP; | |
103 | ||
104 | // 'return' to complete switch | |
105 | ret; | |
106 | .cfi_endproc | |
107 | .size CSYM(fiber_switchContext),.-CSYM(fiber_switchContext) | |
108 | ||
109 | #endif |