1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
|
/* Setup thread stack. Viengoos/i386 version.
Copyright (C) 2000, 2002, 2008 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <l4.h>
#include <pt-internal.h>
#include <hurd/thread.h>
#include <hurd/exceptions.h>
/* The stack layout used on the i386 is:
-----------------
| ARG |
-----------------
| START_ROUTINE |
-----------------
| Return address |
----------------- <- %ebp
| Frame pointer |
-----------------
We do the following: setup the stack to return to the entry routine.
*/
/* The stack contains:
arg
start_routine
0 <- fake return address
C entry_point
*/
extern uintptr_t _pthread_entry_point;
__asm__ ("\n\
.globl _pthread_entry_point, __pthread_entry_point\n\
_pthread_entry_point:\n\
__pthread_entry_point:\n\
pushl $0\n\
popf\n\
\n\
xor %ebp, %ebp\n\
ret\n");
/* Set up the stack for THREAD, such that it appears as if
START_ROUTINE and ARG were passed to the new thread's entry-point.
Return the stack pointer for the new thread. We also take the
opportunity to install THREAD in our utcb. */
static void *
stack_setup (struct __pthread *thread,
void *(*start_routine)(void *), void *arg,
void (*entry_point)(void *(*)(void *), void *))
{
uintptr_t *top;
/* Calculate top of the new stack. */
top = (uintptr_t *) ((uintptr_t) thread->stackaddr + thread->stacksize);
/* Align on 0x10 for MMX operations. */
top = (uintptr_t) top & ~0xf;
if (start_routine)
{
/* Set up call frame. */
*--top = (uintptr_t) arg; /* Argument to START_ROUTINE. */
*--top = (uintptr_t) start_routine;
*--top = 0; /* Fake return address. */
*--top = (uintptr_t) entry_point;
}
return top;
}
int
__pthread_setup (struct __pthread *thread,
void (*entry_point)(void *(*)(void *), void *),
void *(*start_routine)(void *), void *arg)
{
thread->mcontext.pc = (void *) &_pthread_entry_point;
thread->mcontext.sp = (void *) stack_setup (thread, start_routine, arg,
entry_point);
if (__pthread_num_threads == 1)
return 0;
assert (! ADDR_IS_VOID (thread->exception_area[0]));
struct exception_page *exception_page = thread->exception_area_va;
/* SP is set to the end of the exception area minus one word, which
is the location of the exception page. */
exception_page->exception_handler_sp
= (uintptr_t) thread->exception_area_va + EXCEPTION_AREA_SIZE;
exception_page->exception_handler_sp -= sizeof (void *);
* (void **) exception_page->exception_handler_sp = thread->exception_area_va;
exception_page->exception_handler_ip = (uintptr_t) &exception_handler_entry;
exception_page->exception_handler_end = (uintptr_t) &exception_handler_end;
return 0;
}
|
