Code clean-up.
[reactos.git] / reactos / ntoskrnl / ke / i386 / bthread.S
1 /*
2 * ReactOS kernel
3 * Copyright (C) 2000 David Welch <welch@cwcom.net>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18 */
19 /* $Id: bthread.S,v 1.10 2004/10/31 19:46:10 ekohl Exp $
20 *
21 * COPYRIGHT: See COPYING in the top level directory
22 * PROJECT: ReactOS kernel
23 * FILE: ntoskrnl/ke/i386/bthread.S
24 * PURPOSE: Trap handlers
25 * PROGRAMMER: David Welch (david.welch@seh.ox.ac.uk)
26 */
27
28 /* INCLUDES ******************************************************************/
29
30 #include <ddk/status.h>
31 #include <internal/i386/segment.h>
32 #include <internal/ps.h>
33 #include <ddk/defines.h>
34
35 /* Values for contextflags */
36 #define CONTEXT_i386 0x10000
37 #ifndef CONTEXT_CONTROL
38 #define CONTEXT_CONTROL (CONTEXT_i386 | 1)
39 #endif
40 #ifndef CONTEXT_INTEGER
41 #define CONTEXT_INTEGER (CONTEXT_i386 | 2)
42 #endif
43 #ifndef CONTEXT_SEGMENTS
44 #define CONTEXT_SEGMENTS (CONTEXT_i386 | 4)
45 #endif
46 #ifndef CONTEXT_FLOATING_POINT
47 #define CONTEXT_FLOATING_POINT (CONTEXT_i386 | 8)
48 #endif
49 #ifndef CONTEXT_DEBUG_REGISTERS
50 #define CONTEXT_DEBUG_REGISTERS (CONTEXT_i386 | 0x10)
51 #endif
52 #ifndef CONTEXT_FULL
53 #define CONTEXT_FULL (CONTEXT_CONTROL | CONTEXT_INTEGER | CONTEXT_SEGMENTS)
54 #endif
55
56 /* FUNCTIONS *****************************************************************/
57
58 /*
59 *
60 */
61
62 .globl _PsBeginThreadWithContextInternal
63 .globl _PsBeginThread
64
65 _PsBeginThread:
66 /*
67 * This isn't really a function, we are called as the return address
68 * of the context switch function
69 */
70
71 /*
72 * Do the necessary prolog after a context switch
73 */
74 call _PiBeforeBeginThread
75
76 /*
77 * Call the actual start of the thread
78 */
79 movl 4(%esp), %ebx /* Start routine */
80 movl 8(%esp), %eax /* Start context */
81 pushl %eax
82 call *%ebx /* Call the start routine */
83 addl $4, %esp
84
85 /*
86 * Terminate the thread
87 */
88 pushl %eax
89 call _PsTerminateSystemThread@4
90 addl $4, %esp
91
92 /*
93 * If that fails then bug check
94 */
95 pushl $0
96 call _KeBugCheck@4
97 addl $4, %esp
98
99 /*
100 * And if that fails then loop
101 */
102 .1:
103 jmp .1
104
105
106 _PsBeginThreadWithContextInternal:
107 /*
108 * This isn't really a function, we are called as the return
109 * address of a context switch
110 */
111
112 /*
113 * Do the necessary prolog before the context switch
114 */
115 call _PiBeforeBeginThread
116
117 /*
118 * Load the context flags.
119 */
120 popl %ebx
121
122 /*
123 * Load the debugging registers
124 */
125 testl $(CONTEXT_DEBUG_REGISTERS & ~CONTEXT_i386), %ebx
126 jz .L1
127 popl %eax /* Dr0 */
128 movl %eax, %dr0
129 popl %eax /* Dr1 */
130 movl %eax, %dr1
131 popl %eax /* Dr2 */
132 movl %eax, %dr2
133 popl %eax /* Dr3 */
134 movl %eax, %dr3
135 popl %eax /* Dr6 */
136 movl %eax, %dr6
137 popl %eax /* Dr7 */
138 movl %eax, %dr7
139 jmp .L3
140 .L1:
141 addl $24, %esp
142 .L3:
143
144 /*
145 * Load the floating point registers
146 */
147 movl (_HardwareMathSupport), %eax
148 testl %eax,%eax
149 jz .L2
150 testl $(CONTEXT_FLOATING_POINT & ~CONTEXT_i386), %ebx
151 jz .L2
152 frstor (%esp)
153 .L2:
154 addl $112, %esp
155
156 /* Load the rest of the thread's user mode context. */
157 movl $0, %eax
158 jmp KeReturnFromSystemCallWithHook