| 1 | /* |
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| 2 | * Copyright (c) 2011 Aeroflex Gaisler |
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| 3 | * |
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| 4 | * BSD license: |
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| 5 | * |
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| 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
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| 7 | * of this software and associated documentation files (the "Software"), to deal |
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| 8 | * in the Software without restriction, including without limitation the rights |
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| 9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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| 10 | * copies of the Software, and to permit persons to whom the Software is |
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| 11 | * furnished to do so, subject to the following conditions: |
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| 12 | * |
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| 13 | * The above copyright notice and this permission notice shall be included in |
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| 14 | * all copies or substantial portions of the Software. |
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| 15 | * |
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| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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| 19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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| 20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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| 21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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| 22 | * THE SOFTWARE. |
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| 23 | */ |
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| 24 | |
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| 25 | |
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| 26 | #ifndef _SYS_STACK_H_ |
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| 27 | #define _SYS_STACK_H_ |
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| 28 | |
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| 29 | #if !defined(_ASM) |
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| 30 | #include <sys/types.h> |
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| 31 | #endif |
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| 32 | |
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| 33 | #ifdef __cplusplus |
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| 34 | extern "C" |
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| 35 | { |
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| 36 | #endif |
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| 37 | |
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| 38 | /* |
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| 39 | * A stack frame looks like: |
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| 40 | * |
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| 41 | * %fp->| | |
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| 42 | * |-------------------------------| |
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| 43 | * | Locals, temps, saved floats | |
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| 44 | * |-------------------------------| |
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| 45 | * | outgoing parameters past 6 | |
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| 46 | * |-------------------------------|-\ |
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| 47 | * | 6 words for callee to dump | | |
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| 48 | * | register arguments | | |
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| 49 | * |-------------------------------| > minimum stack frame |
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| 50 | * | One word struct-ret address | | |
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| 51 | * |-------------------------------| | |
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| 52 | * | 16 words to save IN and | | |
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| 53 | * %sp->| LOCAL register on overflow | | |
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| 54 | * |-------------------------------|-/ |
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| 55 | */ |
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| 56 | |
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| 57 | /* |
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| 58 | * Constants defining a 32-bit stack frame. |
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| 59 | */ |
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| 60 | #define WINDOWSIZE (16*4) /* size of window save area */ |
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| 61 | #define ARGPUSHSIZE (6*4) /* size of arg dump area */ |
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| 62 | #define ARGPUSH (WINDOWSIZE + 4) /* arg dump area offset */ |
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| 63 | #define MINFRAME (WINDOWSIZE + ARGPUSHSIZE + 4) /* min frame */ |
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| 64 | |
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| 65 | #define STACK_GROWTH_DOWN /* stacks grow from high to low addresses */ |
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| 66 | |
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| 67 | /* |
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| 68 | * Stack alignment macros. |
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| 69 | */ |
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| 70 | #define STACK_ALIGN 8 |
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| 71 | #define SA(X) (((X)+(STACK_ALIGN-1)) & ~(STACK_ALIGN-1)) |
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| 72 | |
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| 73 | #ifdef __cplusplus |
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| 74 | } |
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| 75 | #endif |
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| 76 | |
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| 77 | #endif /* _SYS_STACK_H */ |
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