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/*
* 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 QUICKTHREADS_386_H
#define QUICKTHREADS_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 QUICKTHREADS_STKBASE (13 * 4)
/* Hold 4 saved regs plus one return pc (qt_vstart). */
#define QUICKTHREADS_VSTKBASE (5 * 4)
/* Stack must be 16-byte aligned at function call instr. (SSE data support) */
#define QUICKTHREADS_STKALIGN (16)
/* Where to place various arguments. */
#define QUICKTHREADS_ONLY_INDEX (QUICKTHREADS_PC)
#define QUICKTHREADS_USER_INDEX (QUICKTHREADS_ARG2)
#define QUICKTHREADS_ARGT_INDEX (QUICKTHREADS_ARG1)
#define QUICKTHREADS_ARGU_INDEX (QUICKTHREADS_ARG0)
#define QUICKTHREADS_VSTARTUP_INDEX (QUICKTHREADS_EBP)
#define QUICKTHREADS_VUSERF_INDEX (QUICKTHREADS_EBX)
#define QUICKTHREADS_VCLEANUP_INDEX (QUICKTHREADS_ESI)
#define QUICKTHREADS_VARGT_INDEX (QUICKTHREADS_EDI)
#define QUICKTHREADS_EBX 0
#define QUICKTHREADS_EDI 1
#define QUICKTHREADS_ESI 2
#define QUICKTHREADS_EBP 3
#define QUICKTHREADS_POP0 4
#define QUICKTHREADS_POP1 5
#define QUICKTHREADS_POP2 6
#define QUICKTHREADS_PC 7
/* The following are defined only for non-varargs. */
#define QUICKTHREADS_POPE 8
#define QUICKTHREADS_ARG0 9
#define QUICKTHREADS_ARG1 10
#define QUICKTHREADS_ARG2 11
#define QUICKTHREADS_RPC 12
/* Stack grows down. The top of the stack is the first thing to
pop off (preincrement, postdecrement). */
#define QUICKTHREADS_GROW_DOWN
extern void qt_error (void);
/* For correct 16-byte stack alignment (auto-relocatable functions) */
extern void qt_tramp (void);
extern void qt_align (void);
/* Push on the error return address and the alignment/trampoline functions. */
#define QUICKTHREADS_ARGS_MD(sto) \
(QUICKTHREADS_SPUT (sto, QUICKTHREADS_POP0, qt_align), \
QUICKTHREADS_SPUT (sto, QUICKTHREADS_POP1, qt_align), \
QUICKTHREADS_SPUT (sto, QUICKTHREADS_POP2, qt_align), \
QUICKTHREADS_SPUT (sto, QUICKTHREADS_POPE, qt_tramp), \
QUICKTHREADS_SPUT (sto, QUICKTHREADS_RPC, qt_error))
/* When varargs are pushed, allocate space for all the args. */
#define QUICKTHREADS_VARGS_MD0(sto, nbytes) \
((qt_t *)(((char *)(sto)) - QUICKTHREADS_STKROUNDUP(nbytes)))
#define QUICKTHREADS_VARGS_MD1(sto) \
(QUICKTHREADS_SPUT (sto, QUICKTHREADS_PC, qt_vstart))
#define QUICKTHREADS_VARGS_DEFAULT
#endif /* QUICKTHREADS_386_H */
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