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/*
* Copyright (c) 2011 Aeroflex Gaisler
*
* BSD license:
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef _SYS_STACK_H_
#define _SYS_STACK_H_
#if !defined(_ASM)
#include <sys/types.h>
#endif
#ifdef __cplusplus
extern "C"
{
#endif
/*
* A stack frame looks like:
*
* %fp->| |
* |-------------------------------|
* | Locals, temps, saved floats |
* |-------------------------------|
* | outgoing parameters past 6 |
* |-------------------------------|-\
* | 6 words for callee to dump | |
* | register arguments | |
* |-------------------------------| > minimum stack frame
* | One word struct-ret address | |
* |-------------------------------| |
* | 16 words to save IN and | |
* %sp->| LOCAL register on overflow | |
* |-------------------------------|-/
*/
/*
* Constants defining a 32-bit stack frame.
*/
#define WINDOWSIZE (16*4) /* size of window save area */
#define ARGPUSHSIZE (6*4) /* size of arg dump area */
#define ARGPUSH (WINDOWSIZE + 4) /* arg dump area offset */
#define MINFRAME (WINDOWSIZE + ARGPUSHSIZE + 4) /* min frame */
#define STACK_GROWTH_DOWN /* stacks grow from high to low addresses */
/*
* Stack alignment macros.
*/
#define STACK_ALIGN 8
#define SA(X) (((X)+(STACK_ALIGN-1)) & ~(STACK_ALIGN-1))
#ifdef __cplusplus
}
#endif
#endif /* _SYS_STACK_H */
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