summaryrefslogtreecommitdiff
path: root/sysdeps/unix/sysv/linux/ia64/setcontext.S
blob: 75d97c1afd31840a483792dd38c5013b8f386518 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
/* Copyright (C) 2001 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
     Contributed by David Mosberger-Tang <davidm@hpl.hp.com>.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <sysdep.h>
#include <features.h>

#include "ucontext_i.h"

/*  __setcontext (const ucontext_t *ucp)

  Restores the machine context in UCP and thereby resumes execution
  in that context.

  This implementation in intended to be used for *synchronous* context
  switches only.  Therefore, it does not have to restore anything
  other than the PRESERVED state.  */

ENTRY(__setcontext)
	alloc r16 = ar.pfs, 1, 0, 3, 0

	// sigprocmask (SIG_SETMASK, &sc->sc_mask, NULL):

	mov r2 = SC_MASK
	mov r15 = __NR_rt_sigprocmask
	;;
	mov out0 = SIG_SETMASK
	add out1 = r2, in0
	mov out2 = 0

	invala
	break __BREAK_SYSCALL
	add r2 = SC_NAT, r32

	add r3 = SC_RNAT, r32			// r3 <- &sc_ar_rnat
	add rPOS = SC_GR, r32			// rPOS <- &sc_gr[0]
	;;
	ld8 rNAT = [r2], (SC_BSP-SC_NAT)
	extr.u rPOS = rPOS, 3, 6		// get NaT bit number for r0
	;;
	ld8 rBSP = [r2], (SC_UNAT-SC_BSP)
	ld8 rRNAT = [r3], (SC_FPSR-SC_RNAT)
	/*
	 * Rotate NaT bits by rPOS positions to the left:
	 */
	sub rCPOS = 64, rPOS
	;;
	ld8 rUNAT = [r2], (SC_PFS-SC_UNAT)
	ld8 rFPSR = [r3], (SC_LC-SC_FPSR)
	shl rTMP = rNAT, rPOS
	;;
	ld8 rPFS = [r2], (SC_PR-SC_PFS)
	ld8 rLC = [r3], (SC_BR+0*8-SC_LC)
	shr.u rNAT = rNAT, rCPOS
	;;
	ld8 rPR = [r2], (SC_BR+1*8-SC_PR)
	ld8 rB0 = [r3], 16
	or rNAT = rNAT, rTMP
	;;
	ld8 rB1 = [r2], 16
	ld8 rB2 = [r3], 16
	;;
	mov.m ar.unat = rNAT
	mov.m rRSC = ar.rsc
	;;
	ld8 rB3 = [r2], 16
	ld8 rB4 = [r3], (SC_GR+1*8-(SC_BR+4*8))
	;;
	ld8 rB5 = [r2], (SC_GR+4*8-(SC_BR+5*8))
	ld8.fill r1 = [r3], (5*8 - 1*8)
	;;
	ld8.fill r4 = [r2], 16
	ld8.fill r5 = [r3], 16
	mov b0 = rB0
	;;
	ld8.fill r6 = [r2], 48
	ld8.fill r7 = [r3], (SC_FR+2*16-(SC_GR+7*8))
	;;
	ld8.fill sp = [r2], (SC_FR+3*16-(SC_GR+12*8))
	mov.m ar.fpsr = rFPSR
	mov.i ar.pfs = rPFS
	;;
	ldf.fill f3 = [r2], 16
	ldf.fill f2 = [r3], 48
	mov b1 = rB1
	;;
	ldf.fill f4 = [r2], (16*16-4*16)
	ldf.fill f5 = [r3], (17*16-5*16)
	mov b2 = rB2
	;;
	ldf.fill f16 = [r2], 32
	ldf.fill f17 = [r3], 32
	mov b3 = rB3
	;;
	ldf.fill f18 = [r2], 32
	ldf.fill f19 = [r3], 32
	mov b4 = rB4
	;;
	ldf.fill f20 = [r2], 32
	ldf.fill f21 = [r3], 32
	mov b5 = rB5
	;;
	ldf.fill f22 = [r2], 32
	ldf.fill f23 = [r3], 32
	mov r8 = 0
	;;
	ldf.fill f24 = [r2], 32
	ldf.fill f25 = [r3], 32
	mov r9 = 0
	;;
	ldf.fill f26 = [r2], 32
	ldf.fill f27 = [r3], 32
	dep rTMP = 0, rRSC, 16, 14	// clear ar.rsc.loadrs
	;;
	ldf.fill f28 = [r2], 32
	ldf.fill f29 = [r3], 32
	and rTMP = ~0x3, rTMP		// clear ar.rsc.mode
	;;
	ldf.fill f30 = [r2], 32
	ldf.fill f31 = [r3], 32
	mov pr = rPR, -1
	;;
	mov.m ar.rsc = rTMP		// put RSE into enforced lazy mode
	;;
	loadrs				// drop dirty partition
	;;
	mov.m ar.bspstore = rBSP
	mov.m ar.unat = rUNAT
	mov.i ar.lc = rLC
	;;
	mov.m ar.rnat = rRNAT
	mov.m ar.rsc = rRSC
	ret
END(__setcontext)

weak_alias(__setcontext, setcontext)