WebSVN – HelenOS – Diff – /trunk/uspace/lib/libc/arch/ia32/src/fibril.S


#
# Copyright (c) 2001-2004 Jakub Jermar
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# - Redistributions of source code must retain the above copyright
#   notice, this list of conditions and the following disclaimer.
# - Redistributions in binary form must reproduce the above copyright
#   notice, this list of conditions and the following disclaimer in the
#   documentation and/or other materials provided with the distribution.
# - The name of the author may not be used to endorse or promote products
#   derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
 
#include <kernel/arch/context_offset.h>
 
.text
 
.global context_save
.global context_restore
 
 
## Save current CPU context
#
# Save CPU context to the context_t variable
# pointed by the 1st argument. Returns 1 in EAX.
#
context_save:
	movl 0(%esp),%eax	# the caller's return %eip
	movl 4(%esp),%edx	# address of the context variable to save context to
 
 
 
 
		# save registers to given structure
	CONTEXT_SAVE_ARCH_CORE %edx %eax
 
 
	# Save TLS
	movl %gs:0, %eax
	movl %eax, OFFSET_TLS(%edx)     # tls -> ctx->tls
	
	xorl %eax,%eax		# context_save returns 1
	incl %eax
	ret
 
 
## Restore saved CPU context
#
# Restore CPU context from context_t variable
# pointed by the 1st argument. Returns 0 in EAX.
#
context_restore:
	movl 4(%esp),%eax	# address of the context variable to restore context from
 
		# restore registers from jmp_buf
	CONTEXT_RESTORE_ARCH_CORE %eax %edx
 
 
 
 
 
	movl %edx,0(%esp)	# ctx->pc -> saver's return %eip
 
	# Set thread local storage
	pushl %edx
	movl OFFSET_TLS(%eax), %edx   # Set arg1 to TLS addr
	movl $1, %eax         # Syscall SYS_TLS_SET
	int $0x30
	popl %edx
	
	xorl %eax,%eax		# context_restore returns 0
	ret
 

Rev 2613	Rev 2776
1	#	1	#
2	# Copyright (c) 2001-2004 Jakub Jermar	2	# Copyright (c) 2001-2004 Jakub Jermar
3	# All rights reserved.	3	# All rights reserved.
4	#	4	#
5	# Redistribution and use in source and binary forms, with or without	5	# Redistribution and use in source and binary forms, with or without
6	# modification, are permitted provided that the following conditions	6	# modification, are permitted provided that the following conditions
7	# are met:	7	# are met:
8	#	8	#
9	# - Redistributions of source code must retain the above copyright	9	# - Redistributions of source code must retain the above copyright
10	# notice, this list of conditions and the following disclaimer.	10	# notice, this list of conditions and the following disclaimer.
11	# - Redistributions in binary form must reproduce the above copyright	11	# - Redistributions in binary form must reproduce the above copyright
12	# notice, this list of conditions and the following disclaimer in the	12	# notice, this list of conditions and the following disclaimer in the
13	# documentation and/or other materials provided with the distribution.	13	# documentation and/or other materials provided with the distribution.
14	# - The name of the author may not be used to endorse or promote products	14	# - The name of the author may not be used to endorse or promote products
15	# derived from this software without specific prior written permission.	15	# derived from this software without specific prior written permission.
16	#	16	#
17	# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	#	27	#
28		28
-		29	#include <kernel/arch/context_offset.h>
-		30
29	.text	31	.text
30		32
31	.global context_save	33	.global context_save
32	.global context_restore	34	.global context_restore
33		35
34		36
35	## Save current CPU context	37	## Save current CPU context
36	#	38	#
37	# Save CPU context to the context_t variable	39	# Save CPU context to the context_t variable
38	# pointed by the 1st argument. Returns 1 in EAX.	40	# pointed by the 1st argument. Returns 1 in EAX.
39	#	41	#
40	context_save:	42	context_save:
41	movl 0(%esp),%eax # the caller's return %eip	43	movl 0(%esp),%eax # the caller's return %eip
42	movl 4(%esp),%edx # address of the context variable to save context to	44	movl 4(%esp),%edx # address of the context variable to save context to
43		45
44	movl %esp,0(%edx) # %esp -> ctx->sp	-
45	movl %eax,4(%edx) # %eip -> ctx->pc	-
46	movl %ebx,8(%edx) # %ebx -> ctx->ebx	-
47	movl %esi,12(%edx) # %esi -> ctx->esi	46	# save registers to given structure
48	movl %edi,16(%edx) # %edi -> ctx->edi	47	CONTEXT_SAVE_ARCH_CORE %edx %eax
49	movl %ebp,20(%edx) # %ebp -> ctx->ebp	-
50		48
51	# Save TLS	49	# Save TLS
52	movl %gs:0, %eax	50	movl %gs:0, %eax
53	movl %eax, 24(%edx) # tls -> ctx->tls	51	movl %eax, OFFSET_TLS(%edx) # tls -> ctx->tls
54		52
55	xorl %eax,%eax # context_save returns 1	53	xorl %eax,%eax # context_save returns 1
56	incl %eax	54	incl %eax
57	ret	55	ret
58		56
59		57
60	## Restore saved CPU context	58	## Restore saved CPU context
61	#	59	#
62	# Restore CPU context from context_t variable	60	# Restore CPU context from context_t variable
63	# pointed by the 1st argument. Returns 0 in EAX.	61	# pointed by the 1st argument. Returns 0 in EAX.
64	#	62	#
65	context_restore:	63	context_restore:
66	movl 4(%esp),%eax # address of the context variable to restore context from	64	movl 4(%esp),%eax # address of the context variable to restore context from
-		65
67	movl 0(%eax),%esp # ctx->sp -> %esp	66	# restore registers from jmp_buf
68	movl 4(%eax),%edx # ctx->pc -> %edx	67	CONTEXT_RESTORE_ARCH_CORE %eax %edx
69	movl 8(%eax),%ebx # ctx->ebx -> %ebx	-
70	movl 12(%eax),%esi # ctx->esi -> %esi	-
71	movl 16(%eax),%edi # ctx->edi -> %edi	-
72	movl 20(%eax),%ebp # ctx->ebp -> %ebp	-
73		68
74	movl %edx,0(%esp) # ctx->pc -> saver's return %eip	69	movl %edx,0(%esp) # ctx->pc -> saver's return %eip
75		70
76	# Set thread local storage	71	# Set thread local storage
77	pushl %edx	72	pushl %edx
78	movl 24(%eax), %edx # Set arg1 to TLS addr	73	movl OFFSET_TLS(%eax), %edx # Set arg1 to TLS addr
79	movl $1, %eax # Syscall SYS_TLS_SET	74	movl $1, %eax # Syscall SYS_TLS_SET
80	int $0x30	75	int $0x30
81	popl %edx	76	popl %edx
82		77
83	xorl %eax,%eax # context_restore returns 0	78	xorl %eax,%eax # context_restore returns 0
84	ret	79	ret
85		80

Subversion Repositories HelenOS

(root)/trunk/uspace/lib/libc/arch/ia32/src/fibril.S – Rev 2613 → 2776