1 /* Copyright (C) 2001-2019 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by David Mosberger-Tang <davidm@hpl.hp.com>.
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.
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.
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/>. */
22 #include "ucontext_i.h"
24 /* __setcontext (const ucontext_t *ucp)
26 Restores the machine context in UCP and thereby resumes execution
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. */
36 alloc r11 = ar.pfs, 1, 0, 4, 0
38 // sigprocmask (SIG_SETMASK, &sc->sc_mask, NULL):
41 mov out0 = SIG_SETMASK
45 mov out3 = 8 // sizeof kernel sigset_t
48 DO_CALL(__NR_rt_sigprocmask)
51 add r3 = SC_RNAT, r32 // r3 <- &sc_ar_rnat
52 add rPOS = SC_GR, r32 // rPOS <- &sc_gr[0]
54 ld8 rNAT = [r2], (SC_BSP-SC_NAT)
55 extr.u rPOS = rPOS, 3, 6 // get NaT bit number for r0
57 ld8 rBSP = [r2], (SC_UNAT-SC_BSP)
58 ld8 rRNAT = [r3], (SC_FPSR-SC_RNAT)
60 * Rotate NaT bits by rPOS positions to the left:
64 ld8 rUNAT = [r2], (SC_PFS-SC_UNAT)
65 ld8 rFPSR = [r3], (SC_LC-SC_FPSR)
68 ld8 rPFS = [r2], (SC_PR-SC_PFS)
69 ld8 rLC = [r3], (SC_BR+0*8-SC_LC)
70 shr.u rNAT = rNAT, rCPOS
72 ld8 rPR = [r2], (SC_BR+1*8-SC_PR)
83 ld8 rB4 = [r3], (SC_GR+1*8-(SC_BR+4*8))
85 ld8 rB5 = [r2], (SC_GR+4*8-(SC_BR+5*8))
86 ld8.fill r1 = [r3], (5*8 - 1*8)
88 ld8.fill r4 = [r2], 16
89 ld8.fill r5 = [r3], 16
92 ld8.fill r6 = [r2], 48
93 ld8.fill r7 = [r3], (SC_FR+2*16-(SC_GR+7*8))
95 ld8.fill sp = [r2], (SC_FR+3*16-(SC_GR+12*8))
99 ldf.fill f3 = [r2], 16
100 ldf.fill f2 = [r3], 48
103 ldf.fill f4 = [r2], (16*16-4*16)
104 ldf.fill f5 = [r3], (17*16-5*16)
107 ldf.fill f16 = [r2], 32
108 ldf.fill f17 = [r3], 32
111 ldf.fill f18 = [r2], 32
112 ldf.fill f19 = [r3], 32
115 ldf.fill f20 = [r2], 32
116 ldf.fill f21 = [r3], 32
119 ldf.fill f22 = [r2], 32
120 ldf.fill f23 = [r3], 32
123 ldf.fill f24 = [r2], 32
124 ldf.fill f25 = [r3], 32
127 ldf.fill f26 = [r2], 32
128 ldf.fill f27 = [r3], 32
129 dep rTMP = 0, rRSC, 16, 14 // clear ar.rsc.loadrs
131 ldf.fill f28 = [r2], 32
132 ldf.fill f29 = [r3], 32
133 and rTMP = ~0x3, rTMP // clear ar.rsc.mode
135 ldf.fill f30 = [r2], 32
136 ldf.fill f31 = [r3], 32
139 mov.m ar.rsc = rTMP // put RSE into enforced lazy mode
141 loadrs // drop dirty partition
143 mov.m ar.bspstore = rBSP
144 mov.m ar.unat = rUNAT
147 mov.m ar.rnat = rRNAT
152 weak_alias (__setcontext, setcontext)