diff options
Diffstat (limited to 'qt/md/sparc.h')
-rw-r--r-- | qt/md/sparc.h | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/qt/md/sparc.h b/qt/md/sparc.h new file mode 100644 index 000000000..e2ab281b4 --- /dev/null +++ b/qt/md/sparc.h @@ -0,0 +1,140 @@ +/* + * QuickThreads -- Threads-building toolkit. + * Copyright (c) 1993 by David Keppel + * + * Permission to use, copy, modify and distribute this software and + * its documentation for any purpose and without fee is hereby + * granted, provided that the above copyright notice and this notice + * appear in all copies. This software is provided as a + * proof-of-concept and for demonstration purposes; there is no + * representation about the suitability of this software for any + * purpose. + */ + +#ifndef QT_SPARC_H +#define QT_SPARC_H + +typedef unsigned long qt_word_t; + +/* Stack layout on the sparc: + + non-varargs: + + +--- + | <blank space for alignment> + | %o7 == return address -> qt_start + | %i7 + | %i6 == frame pointer -> 0 (NULL-terminated stack frame chain) + | %i5 -> only + | %i4 -> userf + | %i3 + | %i2 -> pt + | %i1 -> pu + | %i0 + | %l7 + | %l6 + | %l5 + | %l4 + | %l3 + | %l2 + | %l1 + | %l0 <--- qt_t.sp + +--- + + varargs: + + | : + | : + | argument list + | one-word aggregate return pointer + +--- + | <blank space for alignment> + | %o7 == return address -> qt_vstart + | %i7 + | %i6 == frame pointer -> 0 (NULL-terminated stack frame chain) + | %i5 -> startup + | %i4 -> userf + | %i3 -> cleanup + | %i2 -> pt + | %i1 + | %i0 + | %l7 + | %l6 + | %l5 + | %l4 + | %l3 + | %l2 + | %l1 + | %l0 <--- qt_t.sp + +--- + + */ + + +/* What to do to start a thread running. */ +extern void qt_start (void); +extern void qt_vstart (void); + + +/* Hold 17 saved registers + 1 word for alignment. */ +#define QT_STKBASE (18 * 4) +#define QT_VSTKBASE QT_STKBASE + + +/* Stack must be doubleword aligned. */ +#define QT_STKALIGN (8) /* Doubleword aligned. */ + +#define QT_ONLY_INDEX (QT_I5) +#define QT_USER_INDEX (QT_I4) +#define QT_ARGT_INDEX (QT_I2) +#define QT_ARGU_INDEX (QT_I1) + +#define QT_VSTARTUP_INDEX (QT_I5) +#define QT_VUSERF_INDEX (QT_I4) +#define QT_VCLEANUP_INDEX (QT_I3) +#define QT_VARGT_INDEX (QT_I2) + +#define QT_O7 (16) +#define QT_I6 (14) +#define QT_I5 (13) +#define QT_I4 (12) +#define QT_I3 (11) +#define QT_I2 (10) +#define QT_I1 ( 9) + + +/* The thread will ``return'' to the `qt_start' routine to get things + going. The normal return sequence takes us to QT_O7+8, so we + pre-subtract 8. The frame pointer chain is 0-terminated to prevent + the trap handler from chasing off in to random memory when flushing + stack windows. */ + +#define QT_ARGS_MD(top) \ + (QT_SPUT ((top), QT_O7, ((void *)(((int)qt_start)-8))), \ + QT_SPUT ((top), QT_I6, 0)) + + +/* The varargs startup routine always reads 6 words of arguments + (6 argument registers) from the stack, offset by one word to + allow for an aggregate return area pointer. If the varargs + routine actually pushed fewer words than that, qt_vstart could read + off the top of the stack. To prevent errors, we always allocate 8 + words. The space is often just wasted. */ + +#define QT_VARGS_MD0(sp, vabytes) \ + ((qt_t *)(((char *)(sp)) - 8*4 - QT_STKROUNDUP(vabytes))) + +#define QT_VARGS_MD1(sp) \ + (QT_SPUT (sp, QT_O7, ((void *)(((int)qt_vstart)-8)))) + +/* The SPARC has wierdo calling conventions which stores a hidden + parameter for returning aggregate values, so the rest of the + parameters are shoved up the stack by one place. */ +#define QT_VARGS_ADJUST(sp) (((char *)sp)+4) + +#define QT_VARGS_DEFAULT + + +#define QT_GROW_DOWN + +#endif /* ndef QT_SPARC_H */ |