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
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
|
/*
* Copyright (c) 2001-2006 Marc Alexander Lehmann <schmorp@schmorp.de>
*
* Redistribution and use in source and binary forms, with or without modifica-
* tion, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. 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.
*
* 3. 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 MER-
* CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
* CIAL, 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 OTH-
* ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*
* This library is modelled strictly after Ralf S. Engelschalls article at
* http://www.gnu.org/software/pth/rse-pmt.ps. So most of the credit must
* go to Ralf S. Engelschall <rse@engelschall.com>.
*/
#include "coro.h"
#if !defined(STACK_ADJUST_PTR)
/* IRIX is decidedly NON-unix */
# if __sgi
# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8)
# define STACK_ADJUST_SIZE(sp,ss) ((ss) - 8)
# elif __i386__ && CORO_LINUX
# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss))
# define STACK_ADJUST_SIZE(sp,ss) (ss)
# elif __amd64__ && CORO_LINUX
# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8)
# define STACK_ADJUST_SIZE(sp,ss) (ss)
# else
# define STACK_ADJUST_PTR(sp,ss) (sp)
# define STACK_ADJUST_SIZE(sp,ss) (ss)
# endif
#endif
#if CORO_UCONTEXT
# include <stddef.h>
#endif
#if CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX
#include <stdlib.h>
#if CORO_SJLJ
# include <stdio.h>
# include <signal.h>
# include <unistd.h>
#endif
static volatile coro_func coro_init_func;
static volatile void *coro_init_arg;
static volatile coro_context *new_coro, *create_coro;
static void
coro_init (void)
{
volatile coro_func func = coro_init_func;
volatile void *arg = coro_init_arg;
coro_transfer ((coro_context *)new_coro, (coro_context *)create_coro);
func ((void *)arg);
/* the new coro returned. bad. just abort() for now */
abort ();
}
# if CORO_SJLJ
static volatile int trampoline_count;
/* trampoline signal handler */
static void
trampoline (int sig)
{
if (setjmp (((coro_context *)new_coro)->env))
coro_init (); /* start it */
else
trampoline_count++;
}
# endif
#endif
/* initialize a machine state */
void coro_create(coro_context *ctx,
coro_func coro, void *arg,
void *sptr, long ssize)
{
#if CORO_UCONTEXT
getcontext (&(ctx->uc));
ctx->uc.uc_link = 0;
ctx->uc.uc_stack.ss_sp = STACK_ADJUST_PTR (sptr,ssize);
ctx->uc.uc_stack.ss_size = (size_t) STACK_ADJUST_SIZE (sptr,ssize);
ctx->uc.uc_stack.ss_flags = 0;
makecontext (&(ctx->uc), (void (*)()) coro, 1, arg);
#elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX
# if CORO_SJLJ
stack_t ostk, nstk;
struct sigaction osa, nsa;
sigset_t nsig, osig;
# endif
coro_context nctx;
coro_init_func = coro;
coro_init_arg = arg;
new_coro = ctx;
create_coro = &nctx;
# if CORO_SJLJ
/* we use SIGUSR2. first block it, then fiddle with it. */
sigemptyset (&nsig);
sigaddset (&nsig, SIGUSR2);
sigprocmask (SIG_BLOCK, &nsig, &osig);
nsa.sa_handler = trampoline;
sigemptyset (&nsa.sa_mask);
nsa.sa_flags = SA_ONSTACK;
if (sigaction (SIGUSR2, &nsa, &osa))
perror ("sigaction");
/* set the new stack */
nstk.ss_sp = STACK_ADJUST_PTR (sptr,ssize); /* yes, some platforms (IRIX) get this wrong. */
nstk.ss_size = STACK_ADJUST_SIZE (sptr,ssize);
nstk.ss_flags = 0;
if (sigaltstack (&nstk, &ostk) < 0)
perror ("sigaltstack");
trampoline_count = 0;
kill (getpid (), SIGUSR2);
sigfillset (&nsig); sigdelset (&nsig, SIGUSR2);
while (!trampoline_count)
sigsuspend (&nsig);
sigaltstack (0, &nstk);
nstk.ss_flags = SS_DISABLE;
if (sigaltstack (&nstk, 0) < 0)
perror ("sigaltstack");
sigaltstack (0, &nstk);
if (~nstk.ss_flags & SS_DISABLE)
abort ();
if (~ostk.ss_flags & SS_DISABLE)
sigaltstack (&ostk, 0);
sigaction (SIGUSR2, &osa, 0);
sigprocmask (SIG_SETMASK, &osig, 0);
# elif CORO_LOSER
setjmp (ctx->env);
#if __CYGWIN__
ctx->env[7] = (long)((char *)sptr + ssize);
ctx->env[8] = (long)coro_init;
#elif defined(_M_IX86)
((_JUMP_BUFFER *)&ctx->env)->Eip = (long)coro_init;
((_JUMP_BUFFER *)&ctx->env)->Esp = (long)STACK_ADJUST_PTR (sptr,ssize);
#elif defined(_M_AMD64)
((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64)coro_init;
((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64)STACK_ADJUST_PTR (sptr,ssize);
#elif defined(_M_IA64)
((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64)coro_init;
((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64)STACK_ADJUST_PTR (sptr,ssize);
#else
#error "microsoft libc or architecture not supported"
#endif
# elif CORO_LINUX
setjmp (ctx->env);
#if defined(__GLIBC__) && defined(__GLIBC_MINOR__) \
&& __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined(JB_PC) && defined(JB_SP)
ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
ctx->env[0].__jmpbuf[JB_SP] = (long)STACK_ADJUST_PTR (sptr,ssize);
#elif defined(__GLIBC__) && defined(__GLIBC_MINOR__) \
&& __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined(__mc68000__)
ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init;
ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize);
#elif defined(__GNU_LIBRARY__) && defined(__i386__)
ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init;
ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize);
#elif defined(__GNU_LIBRARY__) && defined(__amd64__)
ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
ctx->env[0].__jmpbuf[JB_RSP] = (long)STACK_ADJUST_PTR (sptr,ssize);
#else
#error "linux libc or architecture not supported"
#endif
# elif CORO_IRIX
setjmp (ctx->env);
ctx->env[JB_PC] = (__uint64_t)coro_init;
ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr,ssize);
# endif
coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro);
#else
error unsupported architecture
#endif
}
|
