1 | /* Swap two contexts. OpenRISC version. |
2 | Copyright (C) 2022-2024 Free Software Foundation, Inc. |
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 |
16 | License along with the GNU C Library; if not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <sysdep.h> |
20 | #include "ucontext_i.h" |
21 | |
22 | /* int swapcontext (ucontext_t *oucp, const ucontext_t *ucp) */ |
23 | .text |
24 | ENTRY(__swapcontext) |
25 | |
26 | /* Same as getcontext. */ |
27 | /* Store r1, the stack pointer. */ |
28 | l.sw (UCONTEXT_MCONTEXT + 1*4)(r3), r1 |
29 | /* Store r2, the frame pointer. */ |
30 | l.sw (UCONTEXT_MCONTEXT + 2*4)(r3), r2 |
31 | /* Store r9, the link register. */ |
32 | l.sw (UCONTEXT_MCONTEXT + 9*4)(r3), r9 |
33 | /* Store r9 to reg[11] too, as we need two links for makecontext. */ |
34 | l.sw (UCONTEXT_MCONTEXT + 11*4)(r3), r9 |
35 | /* Store r10, the TLS register. */ |
36 | l.sw (UCONTEXT_MCONTEXT + 10*4)(r3), r10 |
37 | /* Store r14-r30 even, callee saved registers. */ |
38 | l.sw (UCONTEXT_MCONTEXT + 14*4)(r3), r14 |
39 | l.sw (UCONTEXT_MCONTEXT + 16*4)(r3), r16 |
40 | l.sw (UCONTEXT_MCONTEXT + 18*4)(r3), r18 |
41 | l.sw (UCONTEXT_MCONTEXT + 20*4)(r3), r20 |
42 | l.sw (UCONTEXT_MCONTEXT + 22*4)(r3), r22 |
43 | l.sw (UCONTEXT_MCONTEXT + 24*4)(r3), r24 |
44 | l.sw (UCONTEXT_MCONTEXT + 26*4)(r3), r26 |
45 | l.sw (UCONTEXT_MCONTEXT + 28*4)(r3), r28 |
46 | l.sw (UCONTEXT_MCONTEXT + 30*4)(r3), r30 |
47 | |
48 | /* Store ucp to non-argument syscall preserved register. */ |
49 | l.ori r30, r4, 0 |
50 | |
51 | /* Get signal mask. */ |
52 | /* rt_sigprocmask (SIG_BLOCK, NULL, &ucp->uc_sigmask, _NSIG8) */ |
53 | l.ori r6, r0, _NSIG8 |
54 | l.addi r5, r3, UCONTEXT_SIGMASK |
55 | l.ori r4, r0, 0 |
56 | l.ori r3, r0, SIG_BLOCK |
57 | l.ori r11, r0, SYS_ify (rt_sigprocmask) |
58 | /* Do the syscall. */ |
59 | l.sys 1 |
60 | l.nop |
61 | |
62 | /* if -4096 < ret < 0 holds, it's an error */ |
63 | l.sfgeui r11, 0xf001 |
64 | l.bf 1f |
65 | l.nop |
66 | |
67 | /* Same as setcontext. */ |
68 | |
69 | /* Restore signal mask. */ |
70 | /* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, NULL, _NSIG8) */ |
71 | l.ori r6, r0, _NSIG8 |
72 | l.ori r5, r0, 0 |
73 | l.addi r4, r30, UCONTEXT_SIGMASK |
74 | l.ori r3, r0, SIG_SETMASK |
75 | l.ori r11, r0, SYS_ify (rt_sigprocmask) |
76 | /* Do the syscall. */ |
77 | l.sys 1 |
78 | l.nop |
79 | |
80 | /* if -4096 < ret < 0 holds, it's an error */ |
81 | l.sfgeui r11, 0xf001 |
82 | l.bf 1f |
83 | l.nop |
84 | |
85 | /* Restore argument registers, for the makecontext case. */ |
86 | l.lwz r3, (UCONTEXT_MCONTEXT + 3*4)(r30) |
87 | l.lwz r4, (UCONTEXT_MCONTEXT + 4*4)(r30) |
88 | l.lwz r5, (UCONTEXT_MCONTEXT + 5*4)(r30) |
89 | l.lwz r6, (UCONTEXT_MCONTEXT + 6*4)(r30) |
90 | l.lwz r7, (UCONTEXT_MCONTEXT + 7*4)(r30) |
91 | l.lwz r8, (UCONTEXT_MCONTEXT + 8*4)(r30) |
92 | |
93 | /* Restore registers stored in getcontext. */ |
94 | l.lwz r1, (UCONTEXT_MCONTEXT + 1*4)(r30) |
95 | l.lwz r2, (UCONTEXT_MCONTEXT + 2*4)(r30) |
96 | l.lwz r9, (UCONTEXT_MCONTEXT + 9*4)(r30) |
97 | l.lwz r10, (UCONTEXT_MCONTEXT + 10*4)(r30) |
98 | l.lwz r11, (UCONTEXT_MCONTEXT + 11*4)(r30) |
99 | l.lwz r14, (UCONTEXT_MCONTEXT + 14*4)(r30) |
100 | l.lwz r16, (UCONTEXT_MCONTEXT + 16*4)(r30) |
101 | l.lwz r18, (UCONTEXT_MCONTEXT + 18*4)(r30) |
102 | l.lwz r20, (UCONTEXT_MCONTEXT + 20*4)(r30) |
103 | l.lwz r22, (UCONTEXT_MCONTEXT + 22*4)(r30) |
104 | l.lwz r24, (UCONTEXT_MCONTEXT + 24*4)(r30) |
105 | l.lwz r26, (UCONTEXT_MCONTEXT + 26*4)(r30) |
106 | l.lwz r28, (UCONTEXT_MCONTEXT + 28*4)(r30) |
107 | l.lwz r30, (UCONTEXT_MCONTEXT + 30*4)(r30) |
108 | |
109 | l.jr r11 |
110 | l.ori r11, r0, 0 |
111 | |
112 | 1: l.j __syscall_error |
113 | l.ori r3, r11, 0 |
114 | |
115 | END (__swapcontext) |
116 | weak_alias (__swapcontext, swapcontext) |
117 | |