HCoop / bpt / guile.git / blame
| Commit | Line | Data |
|---|---|---|
| f9482b31 MV |
1 | /* |
| 2 | * QuickThreads -- Threads-building toolkit. | |
| 3 | * Copyright (c) 1993 by David Keppel | |
| 4 | * Copyright (c) 2002 by Marius Vollmer | |
| 5 | * | |
| 6 | * Permission to use, copy, modify and distribute this software and | |
| 7 | * its documentation for any purpose and without fee is hereby | |
| 8 | * granted, provided that the above copyright notice and this notice | |
| 9 | * appear in all copies. This software is provided as a | |
| 10 | * proof-of-concept and for demonstration purposes; there is no | |
| 11 | * representation about the suitability of this software for any | |
| 12 | * purpose. | |
| 13 | */ | |
| 14 | ||
| 15 | #ifndef QT_ARM_H | |
| 16 | #define QT_ARM_H | |
| 17 | ||
| 18 | typedef unsigned long qt_word_t; | |
| 19 | ||
| 20 | #define QT_GROW_DOWN | |
| 21 | ||
| 22 | /* Stack layout on the ARM: | |
| 23 | ||
| 24 | Callee-save registers are: r4-r11 (f4-f7) | |
| 25 | Also save r14, link register, and restore as pc. | |
| 26 | ||
| 27 | +--- | |
| 28 | | lr/pc | |
| 29 | | r11 | |
| 30 | | r10 | |
| 31 | | r9 | |
| 32 | | r8 | |
| 33 | | r7 | |
| 34 | | r6 | |
| 35 | | r5 | |
| 36 | | r4 <- sp of a suspended thread | |
| 37 | +--- | |
| 38 | ||
| 39 | Startup: | |
| 40 | ||
| 41 | +--- | |
| 42 | | only | |
| 43 | | user | |
| 44 | | argt | |
| 45 | | argu <- sp on entry to qt_start | |
| 46 | +--- | |
| 47 | | pc == qt_start | |
| 48 | | r11 | |
| 49 | | r10 | |
| 50 | | r9 | |
| 51 | | r8 | |
| 52 | | r7 | |
| 53 | | r6 | |
| 54 | | r5 | |
| 55 | | r4 | |
| 56 | +--- | |
| 57 | ||
| 58 | */ | |
| 59 | ||
| 60 | /* Stack must be word aligned. */ | |
| 61 | #define QT_STKALIGN (4) /* Doubleword aligned. */ | |
| 62 | ||
| 63 | /* How much space is allocated to hold all the crud for | |
| 64 | initialization: r4-r11, r14, and the four args for qt_start. */ | |
| 65 | ||
| 66 | #define QT_STKBASE ((9+4)*4) | |
| 67 | ||
| 68 | ||
| 69 | /* Offsets of various registers, in words, relative to final value of SP. */ | |
| 70 | #define QT_LR 8 | |
| 71 | #define QT_11 7 | |
| 72 | #define QT_10 6 | |
| 73 | #define QT_9 5 | |
| 74 | #define QT_8 4 | |
| 75 | #define QT_7 3 | |
| 76 | #define QT_6 2 | |
| 77 | #define QT_5 1 | |
| 78 | #define QT_4 0 | |
| 79 | ||
| 80 | ||
| 81 | /* When a never-before-run thread is restored, the return pc points | |
| 82 | to a fragment of code that starts the thread running. For | |
| 83 | non-vargs functions, it just calls the client's `only' function. | |
| 84 | */ | |
| 85 | ||
| 86 | extern void qt_start(void); | |
| 87 | #define QT_ARGS_MD(sp) (QT_SPUT (sp, QT_LR, qt_start)) | |
| 88 | ||
| 89 | ||
| 90 | /* The *index* (positive offset) of where to put each value. */ | |
| 91 | #define QT_ONLY_INDEX (12) | |
| 92 | #define QT_USER_INDEX (11) | |
| 93 | #define QT_ARGT_INDEX (10) | |
| 94 | #define QT_ARGU_INDEX (9) | |
| 95 | ||
| 96 | #endif /* ndef QT_ARM_H */ |