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
|
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* Debugger co-routine context support. kmdb co-routines are essentially the
* same as the ones used by mdb, with the exception that we allocate the stack
* for the co-routine from our heap.
*/
#include <kmdb/kmdb_context_impl.h>
#include <mdb/mdb_modapi.h>
#include <mdb/mdb_debug.h>
#include <mdb/mdb_err.h>
#include <mdb/mdb_umem.h>
#include <mdb/mdb.h>
#include <sys/types.h>
#include <ucontext.h>
#include <setjmp.h>
static void
context_init(mdb_context_t *volatile c)
{
c->ctx_status = c->ctx_func();
ASSERT(c->ctx_resumes > 0);
longjmp(c->ctx_pcb, 1);
}
mdb_context_t *
mdb_context_create(int (*func)(void))
{
mdb_context_t *c = mdb_zalloc(sizeof (mdb_context_t), UM_NOSLEEP);
size_t pagesize = mdb.m_pagesize;
if (c == NULL)
return (NULL);
c->ctx_func = func;
c->ctx_stacksize = pagesize * 4;
c->ctx_stack = mdb_alloc_align(c->ctx_stacksize, pagesize, UM_NOSLEEP);
if (c->ctx_stack == NULL) {
mdb_free(c, sizeof (mdb_context_t));
return (NULL);
}
kmdb_makecontext(&c->ctx_uc, (void (*)(void *))context_init, c,
c->ctx_stack, c->ctx_stacksize);
return (c);
}
void
mdb_context_destroy(mdb_context_t *c)
{
mdb_free_align(c->ctx_stack, c->ctx_stacksize);
mdb_free(c, sizeof (mdb_context_t));
}
void
mdb_context_switch(mdb_context_t *c)
{
if (setjmp(c->ctx_pcb) == 0 && kmdb_setcontext(&c->ctx_uc) == -1)
fail("failed to change context to %p", (void *)c);
else
fail("unexpectedly returned from context %p", (void *)c);
}
jmp_buf *
mdb_context_getpcb(mdb_context_t *c)
{
c->ctx_resumes++;
return (&c->ctx_pcb);
}
|
