62 lines
1.8 KiB
C
62 lines
1.8 KiB
C
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/*
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* Copyright (C) 2006 Apple Computer, Inc. All rights reserved.
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*
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* This document is the property of Apple Computer, Inc.
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* It is considered confidential and proprietary.
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*
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* This document may not be reproduced or transmitted in any form,
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* in whole or in part, without the express written permission of
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* Apple Computer, Inc.
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*/
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#include <debug.h>
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#include <sys/types.h>
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#include <sys.h>
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#include <sys/task.h>
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static void arch_task_trampoline(void) __noreturn;
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static void
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arch_task_trampoline(void)
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{
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/* exit the critical section we implicitly started with */
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exit_critical_section();
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dprintf(DEBUG_SPEW, "arch_task_trampoline: task %p (%s) routine %p, arg %p\n",
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current_task, current_task->name, current_task->routine, current_task->arg);
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/* call the start routine */
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int ret = current_task->routine(current_task->arg);
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dprintf(DEBUG_SPEW, "arch_task_trampoline: task %p (%s) exits with %d\n",
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current_task, current_task->name, ret);
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task_exit(ret);
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/* never return */
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}
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int
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arch_task_create(struct task *t)
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{
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int i;
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for (i=0; i < 10; i++)
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t->arch.regs[i] = 0;
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/* set the default starting point to be arch_task_trampoline */
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t->arch.regs[ARM_ARCH_TASK_LR] = (uint32_t)&arch_task_trampoline;
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/* the ARM describes some encodings of SP ops (pre/post increment and/or decrement) as
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potentially reaching above the SP by a word. Our toolchain might not emit such encodings,
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but we'd rather be safe than sorry. Originally, we took off 4 bytes, but
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to better align the stacks for some of the newer ABIs (e.g. armv7k), we'll consistently
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take off 16 bytes from the top of the stack */
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t->arch.regs[ARM_ARCH_TASK_SP] = (uint32_t)t->stack_base + t->stack_len - 16;
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t->arch.regs[ARM_ARCH_TASK_FP] = 0;
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#if WITH_VFP
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t->arch.fpexc = 0; /* default state is FP disabled */
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#endif
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return 0;
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}
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