mirror of https://github.com/F-Stack/f-stack.git
85 lines
2.8 KiB
C
85 lines
2.8 KiB
C
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/*
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* BSD LICENSE
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*
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* Copyright (C) Cavium, Inc. 2017.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Cavium, Inc nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef STACK_H
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#define STACK_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "lthread_int.h"
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/*
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* Sets up the initial stack for the lthread.
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*/
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static inline void
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arch_set_stack(struct lthread *lt, void *func)
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{
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void **stack_top = (void *)((char *)(lt->stack) + lt->stack_size);
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/*
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* Align stack_top to 16 bytes. Arm64 has the constraint that the
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* stack pointer must always be quad-word aligned.
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*/
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stack_top = (void **)(((unsigned long)(stack_top)) & ~0xfUL);
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/*
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* First Stack Frame
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*/
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stack_top[0] = NULL;
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stack_top[-1] = NULL;
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/*
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* Initialize the context
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*/
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lt->ctx.fp = &stack_top[-1];
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lt->ctx.sp = &stack_top[-2];
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/*
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* Here only the address of _lthread_exec is saved as the link
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* register value. The argument to _lthread_exec i.e the address of
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* the lthread struct is not saved. This is because the first
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* argument to ctx_switch is the address of the new context,
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* which also happens to be the address of required lthread struct.
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* So while returning from ctx_switch into _thread_exec, parameter
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* register x0 will always contain the required value.
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*/
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lt->ctx.lr = func;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* STACK_H_ */
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