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- /* $FreeBSD$ */
- /* $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 "opt_sched.h"
- #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 */
-
- 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:
- #if defined(__SPE__)
- mfspr %r3,SPR_SPEFSCR
- stw %r3,PCB_VSCR(%r17)
- #endif
- 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) && defined(SCHED_ULE)
- /* 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
- beq- blocked_loop
- isync
- #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:
- #if defined(__SPE__)
- lwz %r3,PCB_VSCR(%r17)
- mtspr SPR_SPEFSCR,%r3
- #endif
- /* 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 */
- #ifdef __SPE__
- li %r3,SPEFSCR_FINVE|SPEFSCR_FDBZE|SPEFSCR_FUNFE|SPEFSCR_FOVFE
- mtspr SPR_SPEFSCR, %r3
- #endif
- b trapexit
- END(fork_trampoline)
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