1 /* Copyright (C) 2001, 2003 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, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
23 #include "ucontext_i.h"
25 /* __setcontext (const ucontext_t *ucp)
27 Restores the machine context in UCP and thereby resumes execution
30 This implementation in intended to be used for *synchronous* context
31 switches only. Therefore, it does not have to restore anything
32 other than the PRESERVED state. */
37 alloc r11 = ar.pfs, 1, 0, 4, 0
39 // sigprocmask (SIG_SETMASK, &sc->sc_mask, NULL):
42 mov out0 = SIG_SETMASK
46 mov out3 = 8 // sizeof kernel sigset_t
49 DO_CALL(__NR_rt_sigprocmask)
52 add r3 = SC_RNAT, r32 // r3 <- &sc_ar_rnat
53 add rPOS = SC_GR, r32 // rPOS <- &sc_gr[0]
55 ld8 rNAT = [r2], (SC_BSP-SC_NAT)
56 extr.u rPOS = rPOS, 3, 6 // get NaT bit number for r0
58 ld8 rBSP = [r2], (SC_UNAT-SC_BSP)
59 ld8 rRNAT = [r3], (SC_FPSR-SC_RNAT)
61 * Rotate NaT bits by rPOS positions to the left:
65 ld8 rUNAT = [r2], (SC_PFS-SC_UNAT)
66 ld8 rFPSR = [r3], (SC_LC-SC_FPSR)
69 ld8 rPFS = [r2], (SC_PR-SC_PFS)
70 ld8 rLC = [r3], (SC_BR+0*8-SC_LC)
71 shr.u rNAT = rNAT, rCPOS
73 ld8 rPR = [r2], (SC_BR+1*8-SC_PR)
84 ld8 rB4 = [r3], (SC_GR+1*8-(SC_BR+4*8))
86 ld8 rB5 = [r2], (SC_GR+4*8-(SC_BR+5*8))
87 ld8.fill r1 = [r3], (5*8 - 1*8)
89 ld8.fill r4 = [r2], 16
90 ld8.fill r5 = [r3], 16
93 ld8.fill r6 = [r2], 48
94 ld8.fill r7 = [r3], (SC_FR+2*16-(SC_GR+7*8))
96 ld8.fill sp = [r2], (SC_FR+3*16-(SC_GR+12*8))
100 ldf.fill f3 = [r2], 16
101 ldf.fill f2 = [r3], 48
104 ldf.fill f4 = [r2], (16*16-4*16)
105 ldf.fill f5 = [r3], (17*16-5*16)
108 ldf.fill f16 = [r2], 32
109 ldf.fill f17 = [r3], 32
112 ldf.fill f18 = [r2], 32
113 ldf.fill f19 = [r3], 32
116 ldf.fill f20 = [r2], 32
117 ldf.fill f21 = [r3], 32
120 ldf.fill f22 = [r2], 32
121 ldf.fill f23 = [r3], 32
124 ldf.fill f24 = [r2], 32
125 ldf.fill f25 = [r3], 32
128 ldf.fill f26 = [r2], 32
129 ldf.fill f27 = [r3], 32
130 dep rTMP = 0, rRSC, 16, 14 // clear ar.rsc.loadrs
132 ldf.fill f28 = [r2], 32
133 ldf.fill f29 = [r3], 32
134 and rTMP = ~0x3, rTMP // clear ar.rsc.mode
136 ldf.fill f30 = [r2], 32
137 ldf.fill f31 = [r3], 32
140 mov.m ar.rsc = rTMP // put RSE into enforced lazy mode
142 loadrs // drop dirty partition
144 mov.m ar.bspstore = rBSP
145 mov.m ar.unat = rUNAT
148 mov.m ar.rnat = rRNAT
153 weak_alias (__setcontext, setcontext)