2 /* $NetBSD: locore.S,v 1.24 2000/05/31 05:09:17 thorpej Exp $ */
5 * Copyright (C) 2001 Benno Rice
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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.
29 * Copyright (C) 1995, 1996 Wolfgang Solfrank.
30 * Copyright (C) 1995, 1996 TooLs GmbH.
31 * All rights reserved.
33 * Redistribution and use in source and binary forms, with or without
34 * modification, are permitted provided that the following conditions
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.
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.
61 #include <sys/syscall.h>
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>
70 * void cpu_switch(struct thread *old,
74 * Switch to a new thread saving the current state in the old thread.
77 stw %r5,TD_LOCK(%r3) /* ULE: update old thread's lock */
78 /* XXX needs to change for MP */
80 lwz %r5,TD_PCB(%r3) /* Get the old thread's PCB ptr */
82 stmw %r12,PCB_CONTEXT(%r5) /* Save the non-volatile GP regs.
83 These can now be used for scratch */
85 mfcr %r16 /* Save the condition register */
87 mflr %r16 /* Save the link register */
89 mfsr %r16,USER_SR /* Save USER_SR for copyin/out */
91 stw %r16,PCB_AIM_USR(%r5)
92 stw %r1,PCB_SP(%r5) /* Save the stack pointer */
94 mr %r14,%r3 /* Copy the old thread ptr... */
95 mr %r15,%r4 /* and the new thread ptr in scratch */
97 lwz %r6,PCB_FLAGS(%r5) /* Save FPU context if needed */
98 andi. %r6, %r6, PCB_FPU
101 mr %r3,%r14 /* restore old thread ptr */
103 bl pmap_deactivate /* Deactivate the current pmap */
105 mr %r3,%r15 /* Get new thread ptr */
106 bl pmap_activate /* Activate the new address space */
108 mfsprg %r7,0 /* Get the pcpu pointer */
109 stw %r15,PC_CURTHREAD(%r7) /* Store new current thread */
110 lwz %r17,TD_PCB(%r15) /* Store new current PCB */
111 stw %r17,PC_CURPCB(%r7)
113 lwz %r6, PCB_FLAGS(%r17) /* Restore FPU context if needed */
114 andi. %r6, %r6, PCB_FPU
116 mr %r3,%r15 /* Pass curthread to enable_fpu */
119 /* thread to restore is in r3 */
121 mr %r3,%r17 /* Recover PCB ptr */
122 lmw %r12,PCB_CONTEXT(%r3) /* Load the non-volatile GP regs */
124 lwz %r5,PCB_CR(%r3) /* Load the condition register */
126 lwz %r5,PCB_LR(%r3) /* Load the link register */
128 lwz %r5,PCB_AIM_USR(%r3) /* Load the USER_SR segment reg */
131 lwz %r1,PCB_SP(%r3) /* Load the stack pointer */
136 * Update pcb, saving current processor state
140 stmw %r12,PCB_CONTEXT(%r3) /* Save the non-volatile GP regs */
141 mfcr %r4 /* Save the condition register */
142 stw %r4,PCB_CONTEXT(%r3)
147 * Set up the return from cpu_fork()
149 ENTRY(fork_trampoline)
154 addi %r1,%r1,CF_SIZE-FSP /* Allow 8 bytes in front of
155 trapframe to simulate FRAME_SETUP
156 does when allocating space for
157 a frame pointer/saved LR */