/* $NetBSD: locore.S,v 1.24 2000/05/31 05:09:17 thorpej Exp $ */ /*- * Copyright (C) 2001 Benno Rice * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY Benno Rice ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /*- * Copyright (C) 1995, 1996 Wolfgang Solfrank. * Copyright (C) 1995, 1996 TooLs GmbH. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by TooLs GmbH. * 4. The name of TooLs GmbH may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "assym.inc" #include <sys/syscall.h> #include <machine/trap.h> #include <machine/param.h> #include <machine/asm.h> #include <machine/spr.h> /* * void cpu_throw(struct thread *old, struct thread *new) */ ENTRY(cpu_throw) mr %r2, %r4 li %r14,0 /* Tell cpu_switchin not to release a thread */ b cpu_switchin END(cpu_throw) /* * void cpu_switch(struct thread *old, * struct thread *new, * struct mutex *mtx); * * Switch to a new thread saving the current state in the old thread. */ ENTRY(cpu_switch) lwz %r6,TD_PCB(%r3) /* Get the old thread's PCB ptr */ stmw %r12,PCB_CONTEXT(%r6) /* Save the non-volatile GP regs. These can now be used for scratch */ mfcr %r16 /* Save the condition register */ stw %r16,PCB_CR(%r6) mflr %r16 /* Save the link register */ stw %r16,PCB_LR(%r6) stw %r1,PCB_SP(%r6) /* Save the stack pointer */ bl 1f 1: mflr %r30 /* Prepare for secure-PLT calls */ addis %r30, %r30, (_GLOBAL_OFFSET_TABLE_-1b)@ha addi %r30, %r30, (_GLOBAL_OFFSET_TABLE_-1b)@l mr %r14,%r3 /* Copy the old thread ptr... */ mr %r2,%r4 /* and the new thread ptr in curthread */ mr %r16,%r5 /* and the new lock */ mr %r17,%r6 /* and the PCB */ /* Keep this next section in sync with cpu_save_thread_regs()! */ lwz %r18,PCB_FLAGS(%r17) /* Save FPU context if needed */ andi. %r7, %r18, PCB_FPU beq .L1 bl save_fpu .L1: mr %r3,%r14 /* restore old thread ptr */ /* Save Altivec context if needed */ andi. %r7, %r18, PCB_VEC beq .L2 bl save_vec .L2: mr %r3,%r14 /* restore old thread ptr */ bl pmap_deactivate /* Deactivate the current pmap */ sync /* Make sure all of that finished */ cpu_switchin: #if defined(SMP) /* Wait for the new thread to become unblocked */ bl 1f 1: mflr %r6 addis %r6,%r6,(_GLOBAL_OFFSET_TABLE_-1b)@ha addi %r6,%r6,(_GLOBAL_OFFSET_TABLE_-1b)@l mr %r30, %r6 /* Prepare for secure-PLT calls */ lwz %r6,blocked_lock@got(%r6) blocked_loop: lwz %r7,TD_LOCK(%r2) cmpw %r6,%r7 isync beq- blocked_loop #endif lwz %r17,TD_PCB(%r2) /* Get new current PCB */ lwz %r1,PCB_SP(%r17) /* Load new stack pointer */ /* Release old thread now that we have a stack pointer set up */ cmpwi %r14,0 beq- 1f stw %r16,TD_LOCK(%r14) /* ULE: update old thread's lock */ 1: mfsprg %r7,0 /* Get the pcpu pointer */ stw %r2,PC_CURTHREAD(%r7) /* Store new current thread */ lwz %r17,TD_PCB(%r2) /* Store new current PCB */ stw %r17,PC_CURPCB(%r7) mr %r3,%r2 /* Get new thread ptr */ bl pmap_activate /* Activate the new address space */ lwz %r19, PCB_FLAGS(%r17) /* Restore FPU context if needed */ andi. %r6, %r19, PCB_FPU beq .L3 mr %r3,%r2 /* Pass curthread to enable_fpu */ bl enable_fpu .L3: /* Restore Altivec context if needed */ andi. %r6, %r19, PCB_VEC beq .L4 mr %r3,%r2 /* Pass curthread to enable_vec */ bl enable_vec .L4: /* thread to restore is in r3 */ mr %r3,%r17 /* Recover PCB ptr */ lmw %r12,PCB_CONTEXT(%r3) /* Load the non-volatile GP regs */ lwz %r5,PCB_CR(%r3) /* Load the condition register */ mtcr %r5 lwz %r5,PCB_LR(%r3) /* Load the link register */ mtlr %r5 lwz %r1,PCB_SP(%r3) /* Load the stack pointer */ /* * Perform a dummy stwcx. to clear any reservations we may have * inherited from the previous thread. It doesn't matter if the * stwcx succeeds or not. pcb_context[0] can be clobbered. */ stwcx. %r1, 0, %r3 blr END(cpu_switch) /* * savectx(pcb) * Update pcb, saving current processor state */ ENTRY(savectx) stmw %r12,PCB_CONTEXT(%r3) /* Save the non-volatile GP regs */ mfcr %r4 /* Save the condition register */ stw %r4,PCB_CR(%r3) stw %r1,PCB_SP(%r3) /* Save the stack pointer */ mflr %r4 /* Save the link register */ stw %r4,PCB_LR(%r3) blr END(savectx) /* * fork_trampoline() * Set up the return from cpu_fork() */ ENTRY(fork_trampoline) lwz %r3,CF_FUNC(%r1) lwz %r4,CF_ARG0(%r1) lwz %r5,CF_ARG1(%r1) bl fork_exit addi %r1,%r1,CF_SIZE-FSP /* Allow 8 bytes in front of trapframe to simulate FRAME_SETUP does when allocating space for a frame pointer/saved LR */ b trapexit END(fork_trampoline)
