swtch64.S revision 139825
1/* $FreeBSD: head/sys/powerpc/aim/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 */ 74ENTRY(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 */ 134ENTRY(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 */ 145ENTRY(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 155