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Diffstat (limited to 'libthreads/i386/thread.c')
| -rw-r--r-- | libthreads/i386/thread.c | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/libthreads/i386/thread.c b/libthreads/i386/thread.c new file mode 100644 index 00000000..00537be5 --- /dev/null +++ b/libthreads/i386/thread.c @@ -0,0 +1,135 @@ +/* + * 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 (); +} |