summaryrefslogtreecommitdiff
path: root/qt/md/i386.h
diff options
context:
space:
mode:
Diffstat (limited to 'qt/md/i386.h')
-rw-r--r--qt/md/i386.h120
1 files changed, 120 insertions, 0 deletions
diff --git a/qt/md/i386.h b/qt/md/i386.h
new file mode 100644
index 000000000..158fe2703
--- /dev/null
+++ b/qt/md/i386.h
@@ -0,0 +1,120 @@
+/*
+ * 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_386_H
+#define QT_386_H
+
+typedef unsigned long qt_word_t;
+
+/* Thread's initial stack layout on the i386:
+
+ non-varargs:
+
+ +---
+ | arg[2] === `userf' on startup
+ | arg[1] === `pt' on startup
+ | arg[0] === `pu' on startup
+ +---
+ | ret pc === qt_error
+ +---
+ | ret pc === `only' on startup
+ +---
+ | %ebp
+ | %esi
+ | %edi
+ | %ebx <--- qt_t.sp
+ +---
+
+ When a non-varargs thread is started, it ``returns'' directly to
+ the client's `only' function.
+
+ varargs:
+
+ +---
+ | arg[n-1]
+ | ..
+ | arg[0]
+ +---
+ | ret pc === `qt_vstart'
+ +---
+ | %ebp === `startup'
+ | %esi === `cleanup'
+ | %edi === `pt'
+ | %ebx === `vuserf' <--- qt_t.sp
+ +---
+
+ When a varargs thread is started, it ``returns'' to the `qt_vstart'
+ startup code. The startup code calls the appropriate functions. */
+
+
+/* What to do to start a varargs thread running. */
+extern void qt_vstart (void);
+
+
+/* Hold 4 saved regs plus two return pcs (qt_error, qt_start) plus
+ three args. */
+#define QT_STKBASE (9 * 4)
+
+/* Hold 4 saved regs plus one return pc (qt_vstart). */
+#define QT_VSTKBASE (5 * 4)
+
+
+/* Stack must be 4-byte aligned. */
+#define QT_STKALIGN (4)
+
+
+/* Where to place various arguments. */
+#define QT_ONLY_INDEX (QT_PC)
+#define QT_USER_INDEX (QT_ARG2)
+#define QT_ARGT_INDEX (QT_ARG1)
+#define QT_ARGU_INDEX (QT_ARG0)
+
+#define QT_VSTARTUP_INDEX (QT_EBP)
+#define QT_VUSERF_INDEX (QT_EBX)
+#define QT_VCLEANUP_INDEX (QT_ESI)
+#define QT_VARGT_INDEX (QT_EDI)
+
+
+#define QT_EBX 0
+#define QT_EDI 1
+#define QT_ESI 2
+#define QT_EBP 3
+#define QT_PC 4
+/* The following are defined only for non-varargs. */
+#define QT_RPC 5
+#define QT_ARG0 6
+#define QT_ARG1 7
+#define QT_ARG2 8
+
+
+/* Stack grows down. The top of the stack is the first thing to
+ pop off (preincrement, postdecrement). */
+#define QT_GROW_DOWN
+
+extern void qt_error (void);
+
+/* Push on the error return address. */
+#define QT_ARGS_MD(sto) \
+ (QT_SPUT (sto, QT_RPC, qt_error))
+
+
+/* When varargs are pushed, allocate space for all the args. */
+#define QT_VARGS_MD0(sto, nbytes) \
+ ((qt_t *)(((char *)(sto)) - QT_STKROUNDUP(nbytes)))
+
+#define QT_VARGS_MD1(sto) \
+ (QT_SPUT (sto, QT_PC, qt_vstart))
+
+#define QT_VARGS_DEFAULT
+
+#endif /* QT_386_H */