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-rw-r--r--physmem/ia32-cmain.c112
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diff --git a/physmem/ia32-cmain.c b/physmem/ia32-cmain.c
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--- a/physmem/ia32-cmain.c
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-/* ia32-cmain.c - Startup code for the ia32.
- Copyright (C) 2003 Free Software Foundation, Inc.
- Written by Marcus Brinkmann.
-
- This file is part of the GNU Hurd.
-
- The GNU Hurd is free software; you can redistribute it and/or
- modify it under the terms of the GNU General Public License as
- published by the Free Software Foundation; either version 2, or (at
- your option) any later version.
-
- The GNU Hurd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */
-
-#if HAVE_CONFIG_H
-#include <config.h>
-#endif
-
-#include <alloca.h>
-#include <stdint.h>
-
-#include <l4/globals.h>
-#include <l4/init.h>
-#include <l4/stubs.h>
-#include <l4/stubs-init.h>
-
-#include "priv.h"
-
-
-/* Initialize libl4, setup the argument vector, and pass control over
- to the main function. */
-void
-cmain (void)
-{
- int argc = 0;
- char **argv = 0;
-
- l4_init ();
- l4_init_stubs ();
-
- argc = 1;
- argv = alloca (sizeof (char *) * 2);
- argv[0] = program_name;
- argv[1] = 0;
-
- /* Now invoke the main function. */
- main (argc, argv);
-
- /* Never reached. */
-}
-
-
-#define __thread_stack_pointer() ({ \
- void *__sp__; \
- __asm__ ("movl %%esp, %0" : "=r" (__sp__)); \
- __sp__; \
-})
-
-
-#define __thread_set_stack_pointer(sp) ({ \
- __asm__ ("movl %0, %%esp" : : "r" (sp)); \
-})
-
-
-/* Switch execution transparently to thread TO. The thread FROM,
- which must be the current thread, will be halted. */
-void
-switch_thread (l4_thread_id_t from, l4_thread_id_t to)
-{
- void *current_stack;
- /* FIXME: Figure out how much we need. Probably only one return
- address. */
- char small_sub_stack[16];
- unsigned int i;
-
-/* FIXME: FROM is an argument to force gcc to evaluate it before the
- thread switch. Maybe this can be done better, but it's
- magical, so be careful. */
-
- /* Save the machine context. */
- __asm__ __volatile__ ("pusha");
- __asm__ __volatile__ ("pushf");
-
- /* Start the TO thread. It will be eventually become a clone of our
- thread. */
- current_stack = __thread_stack_pointer ();
- l4_start_sp_ip (to, (l4_word_t) current_stack,
- (l4_word_t) &&thread_switch_entry);
-
- /* We need a bit of extra space on the stack for
- l4_thread_switch. */
- __thread_set_stack_pointer (small_sub_stack + sizeof (small_sub_stack));
-
- /* We can't use while(1), because then gcc will become clever and
- optimize away everything after thread_switch_entry. */
- for (i = 1; i; i++)
- l4_thread_switch (to);
-
- thread_switch_entry:
- /* Restore the machine context. */
- __asm__ __volatile__ ("popf");
- __asm__ __volatile__ ("popa");
-
- /* The thread TO continues here. */
- l4_stop (from);
-}