1 /* $FreeBSD: releng/6.4/sys/powerpc/powerpc/swtch.S 139825 2005-01-07 02:29:27Z imp $ */
2 /* $NetBSD: locore.S,v 1.24 2000/05/31 05:09:17 thorpej Exp $ */
3
4 /*-
5 * Copyright (C) 2001 Benno Rice
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY Benno Rice ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
25 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
26 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28 /*-
29 * Copyright (C) 1995, 1996 Wolfgang Solfrank.
30 * Copyright (C) 1995, 1996 TooLs GmbH.
31 * All rights reserved.
32 *
33 * Redistribution and use in source and binary forms, with or without
34 * modification, are permitted provided that the following conditions
35 * are met:
36 * 1. Redistributions of source code must retain the above copyright
37 * notice, this list of conditions and the following disclaimer.
38 * 2. Redistributions in binary form must reproduce the above copyright
39 * notice, this list of conditions and the following disclaimer in the
40 * documentation and/or other materials provided with the distribution.
41 * 3. All advertising materials mentioning features or use of this software
42 * must display the following acknowledgement:
43 * This product includes software developed by TooLs GmbH.
44 * 4. The name of TooLs GmbH may not be used to endorse or promote products
45 * derived from this software without specific prior written permission.
46 *
47 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
48 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
49 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
50 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
51 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
52 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
53 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
54 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
55 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
56 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
57 */
58
59 #include "assym.s"
60
61 #include <sys/syscall.h>
62
63 #include <machine/trap.h>
64 #include <machine/param.h>
65 #include <machine/sr.h>
66 #include <machine/psl.h>
67 #include <machine/asm.h>
68
69 /*
70 * void cpu_switch(struct thread *old, struct thread *new)
71 *
72 * Switch to a new thread saving the current state in the old thread.
73 */
74 ENTRY(cpu_switch)
75 lwz %r5,TD_PCB(%r3) /* Get the old thread's PCB ptr */
76
77 mr %r12,%r2
78 stmw %r12,PCB_CONTEXT(%r5) /* Save the non-volatile GP regs.
79 These can now be used for scratch */
80
81 mfcr %r16 /* Save the condition register */
82 stw %r16,PCB_CR(%r5)
83 mflr %r16 /* Save the link register */
84 stw %r16,PCB_LR(%r5)
85 mfsr %r16,USER_SR /* Save USER_SR for copyin/out */
86 isync
87 stw %r16,PCB_USR(%r5)
88 stw %r1,PCB_SP(%r5) /* Save the stack pointer */
89
90 mr %r14,%r3 /* Copy the old thread ptr... */
91 mr %r15,%r4 /* and the new thread ptr in scratch */
92
93 lwz %r6,PCB_FLAGS(%r5) /* Save FPU context if needed */
94 andi. %r6, %r6, PCB_FPU
95 beq .L1
96 bl save_fpu
97 mr %r3,%r14 /* restore old thread ptr */
98 .L1:
99 bl pmap_deactivate /* Deactivate the current pmap */
100
101 mr %r3,%r15 /* Get new thread ptr */
102 bl pmap_activate /* Activate the new address space */
103
104 mfsprg %r7,0 /* Get the pcpu pointer */
105 stw %r15,PC_CURTHREAD(%r7) /* Store new current thread */
106 lwz %r17,TD_PCB(%r15) /* Store new current PCB */
107 stw %r17,PC_CURPCB(%r7)
108
109 lwz %r6, PCB_FLAGS(%r17) /* Restore FPU context if needed */
110 andi. %r6, %r6, PCB_FPU
111 beq .L2
112 mr %r3,%r15 /* Pass curthread to enable_fpu */
113 bl enable_fpu
114
115 /* thread to restore is in r3 */
116 .L2:
117 mr %r3,%r17 /* Recover PCB ptr */
118 lmw %r12,PCB_CONTEXT(%r3) /* Load the non-volatile GP regs */
119 mr %r2,%r12
120 lwz %r5,PCB_CR(%r3) /* Load the condition register */
121 mtcr %r5
122 lwz %r5,PCB_LR(%r3) /* Load the link register */
123 mtlr %r5
124 lwz %r5,PCB_USR(%r3) /* Load the USER_SR segment reg */
125 mtsr USER_SR,%r5
126 isync
127 lwz %r1,PCB_SP(%r3) /* Load the stack pointer */
128 blr
129
130 /*
131 * savectx(pcb)
132 * Update pcb, saving current processor state
133 */
134 ENTRY(savectx)
135 mr %r12,%r2
136 stmw %r12,PCB_CONTEXT(%r3) /* Save the non-volatile GP regs */
137 mfcr %r4 /* Save the condition register */
138 stw %r4,PCB_CONTEXT(%r3)
139 blr
140
141 /*
142 * fork_trampoline()
143 * Set up the return from cpu_fork()
144 */
145 ENTRY(fork_trampoline)
146 lwz %r3,CF_FUNC(%r1)
147 lwz %r4,CF_ARG0(%r1)
148 lwz %r5,CF_ARG1(%r1)
149 bl fork_exit
150 addi %r1,%r1,CF_SIZE-FSP /* Allow 8 bytes in front of
151 trapframe to simulate FRAME_SETUP
152 does when allocating space for
153 a frame pointer/saved LR */
154 b trapexit
Cache object: e408678b0ad22974fbdcf6ae5a84eaf9
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