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/*
* Mach Operating System
* Copyright (c) 1992,1991,1990 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
/*
* HISTORY
* $Log: thread.c,v $
* Revision 2.8 93/02/02 21:54:58 mrt
* Changed include of mach/mach.h to mach.h.
* [93/02/02 mrt]
*
* Revision 2.7 93/01/14 18:05:15 danner
* Converted file to ANSI C.
* Fixed argument types.
* [92/12/18 pds]
*
* Revision 2.6 91/07/31 18:37:07 dbg
* Undefine cthread_sp macro around function definition.
* [91/07/30 17:36:23 dbg]
*
* Revision 2.3 90/06/02 15:13:53 rpd
* Added definition of cthread_sp.
* [90/06/02 rpd]
*
* Revision 2.2 90/05/03 15:55:03 dbg
* Created (from 68020 version).
* [90/02/05 dbg]
*
*/
/*
* i386/thread.c
*
*/
#ifndef lint
char rcs_id[] = "$Header: cvs-sans-libpthread/hurd/libthreads/i386/thread.c,v 1.7 2002/05/27 02:50:10 roland Exp $";
#endif /* not lint */
#include <cthreads.h>
#include "cthread_internals.h"
#include <mach.h>
#include <mach/i386/mach_i386.h>
#include <mach/mig_errors.h>
#define HURD_TLS_DESC_DECL(desc, tcb) \
struct descriptor desc = \
{ /* low word: */ \
0xffff /* limit 0..15 */ \
| (((unsigned int) (tcb)) << 16) /* base 0..15 */ \
, /* high word: */ \
((((unsigned int) (tcb)) >> 16) & 0xff) /* base 16..23 */ \
| ((0x12 | 0x60 | 0x80) << 8) /* access = ACC_DATA_W|ACC_PL_U|ACC_P */ \
| (0xf << 16) /* limit 16..19 */ \
| ((4 | 8) << 20) /* granularity = SZ_32|SZ_G */ \
| (((unsigned int) (tcb)) & 0xff000000) /* base 24..31 */ \
}
/*
* Set up the initial state of a MACH thread
* so that it will invoke cthread_body(child)
* when it is resumed.
*/
void
cproc_setup(register cproc_t child, thread_t thread, tcbhead_t *tcb, void (*routine)(cproc_t))
{
extern unsigned int __hurd_threadvar_max; /* GNU */
register int *top = (int *)
cproc_stack_base (child,
sizeof(ur_cthread_t *) +
/* Account for GNU per-thread variables. */
__hurd_threadvar_max *
sizeof (long int));
struct i386_thread_state state;
register struct i386_thread_state *ts = &state;
kern_return_t r;
unsigned int count;
HURD_TLS_DESC_DECL(desc, tcb);
int sel;
/*
* Set up i386 call frame and registers.
* Read registers first to get correct segment values.
*/
count = i386_THREAD_STATE_COUNT;
MACH_CALL(thread_get_state(thread,i386_REGS_SEGS_STATE,(thread_state_t) &state,&count),r);
ts->eip = (int) routine;
*--top = (int) child; /* argument to function */
*--top = 0; /* fake return address */
ts->uesp = (int) top; /* set stack pointer */
ts->ebp = 0; /* clear frame pointer */
asm ("mov %%gs, %w0" : "=q" (sel) : "0" (0));
tcb->tcb = tcb;
tcb->self = thread;
if (__builtin_expect (sel, 0x48) & 4) /* LDT selector */
__i386_set_ldt (thread, sel, &desc, 1);
else
__i386_set_gdt (thread, &sel, desc);
ts->gs = sel;
MACH_CALL(thread_set_state(thread,i386_REGS_SEGS_STATE,(thread_state_t) &state,i386_THREAD_STATE_COUNT),r);
}
#if defined(cthread_sp)
#undef cthread_sp
#endif
int
cthread_sp(void)
{
return (int) __thread_stack_pointer ();
}
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