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04277e02 | 1 | /* Copyright (C) 2001-2019 Free Software Foundation, Inc. |
d5efd131 MF |
2 | This file is part of the GNU C Library. |
3 | Contributed by David Mosberger-Tang <davidm@hpl.hp.com>. | |
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 | |
75efb018 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
d5efd131 MF |
18 | |
19 | #include <sysdep.h> | |
20 | #include <features.h> | |
21 | ||
22 | #include "ucontext_i.h" | |
23 | ||
24 | /* __setcontext (const ucontext_t *ucp) | |
25 | ||
26 | Restores the machine context in UCP and thereby resumes execution | |
27 | in that context. | |
28 | ||
29 | This implementation in intended to be used for *synchronous* context | |
30 | switches only. Therefore, it does not have to restore anything | |
31 | other than the PRESERVED state. */ | |
32 | ||
33 | ENTRY(__setcontext) | |
34 | .prologue | |
35 | .body | |
36 | alloc r11 = ar.pfs, 1, 0, 4, 0 | |
37 | ||
38 | // sigprocmask (SIG_SETMASK, &sc->sc_mask, NULL): | |
39 | ||
40 | mov r3 = SC_MASK | |
41 | mov out0 = SIG_SETMASK | |
42 | ;; | |
43 | add out1 = r3, in0 | |
44 | mov out2 = 0 | |
45 | mov out3 = 8 // sizeof kernel sigset_t | |
46 | ||
47 | invala | |
48 | DO_CALL(__NR_rt_sigprocmask) | |
49 | add r2 = SC_NAT, r32 | |
50 | ||
51 | add r3 = SC_RNAT, r32 // r3 <- &sc_ar_rnat | |
52 | add rPOS = SC_GR, r32 // rPOS <- &sc_gr[0] | |
53 | ;; | |
54 | ld8 rNAT = [r2], (SC_BSP-SC_NAT) | |
55 | extr.u rPOS = rPOS, 3, 6 // get NaT bit number for r0 | |
56 | ;; | |
57 | ld8 rBSP = [r2], (SC_UNAT-SC_BSP) | |
58 | ld8 rRNAT = [r3], (SC_FPSR-SC_RNAT) | |
59 | /* | |
60 | * Rotate NaT bits by rPOS positions to the left: | |
61 | */ | |
62 | sub rCPOS = 64, rPOS | |
63 | ;; | |
64 | ld8 rUNAT = [r2], (SC_PFS-SC_UNAT) | |
65 | ld8 rFPSR = [r3], (SC_LC-SC_FPSR) | |
66 | shl rTMP = rNAT, rPOS | |
67 | ;; | |
68 | ld8 rPFS = [r2], (SC_PR-SC_PFS) | |
69 | ld8 rLC = [r3], (SC_BR+0*8-SC_LC) | |
70 | shr.u rNAT = rNAT, rCPOS | |
71 | ;; | |
72 | ld8 rPR = [r2], (SC_BR+1*8-SC_PR) | |
73 | ld8 rB0 = [r3], 16 | |
74 | or rNAT = rNAT, rTMP | |
75 | ;; | |
76 | ld8 rB1 = [r2], 16 | |
77 | ld8 rB2 = [r3], 16 | |
78 | ;; | |
79 | mov.m ar.unat = rNAT | |
80 | mov.m rRSC = ar.rsc | |
81 | ;; | |
82 | ld8 rB3 = [r2], 16 | |
83 | ld8 rB4 = [r3], (SC_GR+1*8-(SC_BR+4*8)) | |
84 | ;; | |
85 | ld8 rB5 = [r2], (SC_GR+4*8-(SC_BR+5*8)) | |
86 | ld8.fill r1 = [r3], (5*8 - 1*8) | |
87 | ;; | |
88 | ld8.fill r4 = [r2], 16 | |
89 | ld8.fill r5 = [r3], 16 | |
90 | mov b0 = rB0 | |
91 | ;; | |
92 | ld8.fill r6 = [r2], 48 | |
93 | ld8.fill r7 = [r3], (SC_FR+2*16-(SC_GR+7*8)) | |
94 | ;; | |
95 | ld8.fill sp = [r2], (SC_FR+3*16-(SC_GR+12*8)) | |
96 | mov.m ar.fpsr = rFPSR | |
97 | mov.i ar.pfs = rPFS | |
98 | ;; | |
99 | ldf.fill f3 = [r2], 16 | |
100 | ldf.fill f2 = [r3], 48 | |
101 | mov b1 = rB1 | |
102 | ;; | |
103 | ldf.fill f4 = [r2], (16*16-4*16) | |
104 | ldf.fill f5 = [r3], (17*16-5*16) | |
105 | mov b2 = rB2 | |
106 | ;; | |
107 | ldf.fill f16 = [r2], 32 | |
108 | ldf.fill f17 = [r3], 32 | |
109 | mov b3 = rB3 | |
110 | ;; | |
111 | ldf.fill f18 = [r2], 32 | |
112 | ldf.fill f19 = [r3], 32 | |
113 | mov b4 = rB4 | |
114 | ;; | |
115 | ldf.fill f20 = [r2], 32 | |
116 | ldf.fill f21 = [r3], 32 | |
117 | mov b5 = rB5 | |
118 | ;; | |
119 | ldf.fill f22 = [r2], 32 | |
120 | ldf.fill f23 = [r3], 32 | |
121 | mov r8 = 0 | |
122 | ;; | |
123 | ldf.fill f24 = [r2], 32 | |
124 | ldf.fill f25 = [r3], 32 | |
125 | mov r9 = 0 | |
126 | ;; | |
127 | ldf.fill f26 = [r2], 32 | |
128 | ldf.fill f27 = [r3], 32 | |
129 | dep rTMP = 0, rRSC, 16, 14 // clear ar.rsc.loadrs | |
130 | ;; | |
131 | ldf.fill f28 = [r2], 32 | |
132 | ldf.fill f29 = [r3], 32 | |
133 | and rTMP = ~0x3, rTMP // clear ar.rsc.mode | |
134 | ;; | |
135 | ldf.fill f30 = [r2], 32 | |
136 | ldf.fill f31 = [r3], 32 | |
137 | mov pr = rPR, -1 | |
138 | ;; | |
139 | mov.m ar.rsc = rTMP // put RSE into enforced lazy mode | |
140 | ;; | |
141 | loadrs // drop dirty partition | |
142 | ;; | |
143 | mov.m ar.bspstore = rBSP | |
144 | mov.m ar.unat = rUNAT | |
145 | mov.i ar.lc = rLC | |
146 | ;; | |
147 | mov.m ar.rnat = rRNAT | |
148 | mov.m ar.rsc = rRSC | |
149 | ret | |
150 | END(__setcontext) | |
151 | ||
152 | weak_alias (__setcontext, setcontext) |