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76e95c88 | 1 | /* Save current context and install the given one. |
b168057a | 2 | Copyright (C) 2005-2015 Free Software Foundation, Inc. |
76e95c88 UD |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
76e95c88 UD |
18 | |
19 | #include <sysdep.h> | |
20 | ||
21 | #include "ucontext_i.h" | |
22 | ||
23 | /* int __swapcontext (ucontext_t *ouc, const ucontext_t *uc); */ | |
24 | ||
25 | .text | |
26 | .align 5 | |
76e95c88 UD |
27 | ENTRY(__swapcontext) |
28 | ||
29 | /* Return value of getcontext. R0 is the only register whose | |
30 | value is not preserved. */ | |
31 | mov #0, r0 | |
32 | mov.l r0, @(oR0,r4) | |
33 | mov.l r1, @(oR1,r4) | |
34 | mov.l r2, @(oR2,r4) | |
35 | mov.l r3, @(oR3,r4) | |
36 | mov.l r4, @(oR4,r4) | |
37 | mov.l r5, @(oR5,r4) | |
38 | mov.l r6, @(oR6,r4) | |
39 | mov.l r7, @(oR7,r4) | |
40 | mov r4, r0 | |
41 | add #(oMACL+4), r0 | |
42 | sts.l macl, @-r0 | |
43 | sts.l mach, @-r0 | |
44 | stc.l gbr, @-r0 | |
45 | ||
46 | /* Save T flag to SR. */ | |
47 | movt r1 | |
48 | mov.l r1, @-r0 | |
49 | sts.l pr, @-r0 | |
50 | ||
51 | /* The return address of getcontext is the restart pc. */ | |
52 | sts.l pr, @-r0 | |
53 | ||
54 | mov.l r15, @-r0 | |
55 | mov.l r14, @-r0 | |
56 | mov.l r13, @-r0 | |
57 | mov.l r12, @-r0 | |
58 | mov.l r11, @-r0 | |
59 | mov.l r10, @-r0 | |
60 | mov.l r9, @-r0 | |
61 | mov.l r8, @-r0 | |
62 | ||
63 | mov r5, r8 | |
64 | ||
65 | /* sigprocmask (SIG_SETMASK, &uc->uc_sigmask, &ouc->uc_sigmask). */ | |
66 | add #oSIGMASK, r5 | |
67 | mov r4, r6 | |
68 | add #oSIGMASK, r6 | |
69 | mov #SIG_SETMASK, r4 | |
70 | mov #+SYS_ify(sigprocmask), r3 | |
71 | trapa #0x13 | |
72 | mov r0, r1 | |
73 | mov #-12, r2 | |
74 | shad r2, r1 | |
75 | not r1, r1 // r1=0 means r0 = -1 to -4095 | |
76 | tst r1, r1 // i.e. error in linux | |
77 | bf .Lswapcontext_restore | |
9c84384c | 78 | .Lsyscall_error: |
76e95c88 UD |
79 | SYSCALL_ERROR_HANDLER |
80 | .Lpseudo_end: | |
81 | rts | |
82 | nop | |
9c84384c | 83 | .Lswapcontext_restore: |
76e95c88 UD |
84 | mov r8, r0 |
85 | add #(oPC), r0 | |
86 | mov.l @r0+, r2 | |
87 | lds.l @r0+, pr | |
88 | ||
89 | /* Restore T frag. */ | |
90 | mov.l @r0+, r1 | |
91 | shlr r1 | |
92 | /* Skip GBR which is used for thread pointer. */ | |
93 | add #4, r0 | |
94 | ||
95 | lds.l @r0+, mach | |
96 | lds.l @r0+, macl | |
97 | ||
98 | mov r8, r0 | |
99 | add #(oR9), r0 | |
100 | mov.l @r0+, r9 | |
101 | mov.l @r0+, r10 | |
102 | mov.l @r0+, r11 | |
103 | mov.l @r0+, r12 | |
104 | mov.l @r0+, r13 | |
105 | mov.l @r0+, r14 | |
106 | mov.l @r0+, r15 | |
107 | ||
108 | mov r8, r0 | |
109 | mov.l @(oR0,r0), r1 | |
110 | mov.l r1, @-r15 | |
111 | cfi_adjust_cfa_offset(4) | |
112 | cfi_rel_offset (r1, 0) | |
113 | mov.l r2, @-r15 | |
114 | cfi_adjust_cfa_offset(4) | |
115 | cfi_rel_offset (r2, 0) | |
116 | ||
117 | mov.l @(oR1,r0), r1 | |
118 | mov.l @(oR2,r0), r2 | |
119 | mov.l @(oR3,r0), r3 | |
120 | mov.l @(oR4,r0), r4 | |
121 | mov.l @(oR5,r0), r5 | |
122 | mov.l @(oR6,r0), r6 | |
123 | mov.l @(oR7,r0), r7 | |
124 | mov.l @(oR8,r0), r8 | |
125 | mov.l @r15+, r0 | |
65a4de4e | 126 | cfi_adjust_cfa_offset(-4) |
76e95c88 UD |
127 | jmp @r0 |
128 | mov.l @r15+, r0 | |
9c84384c | 129 | |
76e95c88 UD |
130 | PSEUDO_END(__swapcontext) |
131 | ||
132 | weak_alias (__swapcontext, swapcontext) |