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.
60 #include "opt_sched.h"
62 #include <sys/syscall.h>
64 #include <machine/trap.h>
65 #include <machine/param.h>
66 #include <machine/asm.h>
67 #include <machine/spr.h>
70 * void cpu_throw(struct thread *old, struct thread *new)
74 li %r14,0 /* Tell cpu_switchin not to release a thread */
80 * void cpu_switch(struct thread *old,
84 * Switch to a new thread saving the current state in the old thread.
87 lwz %r6,TD_PCB(%r3) /* Get the old thread's PCB ptr */
88 stmw %r12,PCB_CONTEXT(%r6) /* Save the non-volatile GP regs.
89 These can now be used for scratch */
91 mfcr %r16 /* Save the condition register */
93 mflr %r16 /* Save the link register */
95 stw %r1,PCB_SP(%r6) /* Save the stack pointer */
98 mflr %r30 /* Prepare for secure-PLT calls */
99 addis %r30, %r30, (_GLOBAL_OFFSET_TABLE_-1b)@ha
100 addi %r30, %r30, (_GLOBAL_OFFSET_TABLE_-1b)@l
102 mr %r14,%r3 /* Copy the old thread ptr... */
103 mr %r2,%r4 /* and the new thread ptr in curthread */
104 mr %r16,%r5 /* and the new lock */
105 mr %r17,%r6 /* and the PCB */
107 lwz %r18,PCB_FLAGS(%r17)
108 /* Save FPU context if needed */
109 andi. %r7, %r18, PCB_FPU
114 mr %r3,%r14 /* restore old thread ptr */
115 /* Save Altivec context if needed */
116 andi. %r7, %r18, PCB_VEC
122 mfspr %r3,SPR_SPEFSCR
123 stw %r3,PCB_VSCR(%r17)
125 mr %r3,%r14 /* restore old thread ptr */
126 bl pmap_deactivate /* Deactivate the current pmap */
128 sync /* Make sure all of that finished */
131 #if defined(SMP) && defined(SCHED_ULE)
132 /* Wait for the new thread to become unblocked */
136 addis %r6,%r6,(_GLOBAL_OFFSET_TABLE_-1b)@ha
137 addi %r6,%r6,(_GLOBAL_OFFSET_TABLE_-1b)@l
138 mr %r30, %r6 /* Prepare for secure-PLT calls */
139 lwz %r6,blocked_lock@got(%r6)
147 lwz %r17,TD_PCB(%r2) /* Get new current PCB */
148 lwz %r1,PCB_SP(%r17) /* Load new stack pointer */
150 /* Release old thread now that we have a stack pointer set up */
153 stw %r16,TD_LOCK(%r14) /* ULE: update old thread's lock */
155 1: mfsprg %r7,0 /* Get the pcpu pointer */
156 stw %r2,PC_CURTHREAD(%r7) /* Store new current thread */
157 lwz %r17,TD_PCB(%r2) /* Store new current PCB */
158 stw %r17,PC_CURPCB(%r7)
160 mr %r3,%r2 /* Get new thread ptr */
161 bl pmap_activate /* Activate the new address space */
163 lwz %r19, PCB_FLAGS(%r17)
164 /* Restore FPU context if needed */
165 andi. %r6, %r19, PCB_FPU
167 mr %r3,%r2 /* Pass curthread to enable_fpu */
171 /* Restore Altivec context if needed */
172 andi. %r6, %r19, PCB_VEC
174 mr %r3,%r2 /* Pass curthread to enable_vec */
179 lwz %r3,PCB_VSCR(%r17)
180 mtspr SPR_SPEFSCR,%r3
182 /* thread to restore is in r3 */
183 mr %r3,%r17 /* Recover PCB ptr */
184 lmw %r12,PCB_CONTEXT(%r3) /* Load the non-volatile GP regs */
185 lwz %r5,PCB_CR(%r3) /* Load the condition register */
187 lwz %r5,PCB_LR(%r3) /* Load the link register */
189 lwz %r1,PCB_SP(%r3) /* Load the stack pointer */
191 * Perform a dummy stwcx. to clear any reservations we may have
192 * inherited from the previous thread. It doesn't matter if the
193 * stwcx succeeds or not. pcb_context[0] can be clobbered.
201 * Update pcb, saving current processor state
204 stmw %r12,PCB_CONTEXT(%r3) /* Save the non-volatile GP regs */
205 mfcr %r4 /* Save the condition register */
207 stw %r1,PCB_SP(%r3) /* Save the stack pointer */
208 mflr %r4 /* Save the link register */
215 * Set up the return from cpu_fork()
217 ENTRY(fork_trampoline)
222 addi %r1,%r1,CF_SIZE-FSP /* Allow 8 bytes in front of
223 trapframe to simulate FRAME_SETUP
224 does when allocating space for
225 a frame pointer/saved LR */
227 li %r3,SPEFSCR_FINVE|SPEFSCR_FDBZE|SPEFSCR_FUNFE|SPEFSCR_FOVFE
228 mtspr SPR_SPEFSCR, %r3