1 |
/* |
2 |
* Copyright (c) 2001-2008 Marc Alexander Lehmann <schmorp@schmorp.de> |
3 |
* |
4 |
* Redistribution and use in source and binary forms, with or without modifica- |
5 |
* tion, are permitted provided that the following conditions are met: |
6 |
* |
7 |
* 1. Redistributions of source code must retain the above copyright notice, |
8 |
* this list of conditions and the following disclaimer. |
9 |
* |
10 |
* 2. Redistributions in binary form must reproduce the above copyright |
11 |
* notice, this list of conditions and the following disclaimer in the |
12 |
* documentation and/or other materials provided with the distribution. |
13 |
* |
14 |
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
15 |
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
16 |
* CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
17 |
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- |
18 |
* CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
19 |
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
20 |
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
21 |
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- |
22 |
* ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
23 |
* OF THE POSSIBILITY OF SUCH DAMAGE. |
24 |
* |
25 |
* Alternatively, the contents of this file may be used under the terms of |
26 |
* the GNU General Public License ("GPL") version 2 or any later version, |
27 |
* in which case the provisions of the GPL are applicable instead of |
28 |
* the above. If you wish to allow the use of your version of this file |
29 |
* only under the terms of the GPL and not to allow others to use your |
30 |
* version of this file under the BSD license, indicate your decision |
31 |
* by deleting the provisions above and replace them with the notice |
32 |
* and other provisions required by the GPL. If you do not delete the |
33 |
* provisions above, a recipient may use your version of this file under |
34 |
* either the BSD or the GPL. |
35 |
* |
36 |
* This library is modelled strictly after Ralf S. Engelschalls article at |
37 |
* http://www.gnu.org/software/pth/rse-pmt.ps. So most of the credit must |
38 |
* go to Ralf S. Engelschall <rse@engelschall.com>. |
39 |
*/ |
40 |
|
41 |
#include "coro.h" |
42 |
|
43 |
#include <string.h> |
44 |
|
45 |
#if !defined(STACK_ADJUST_PTR) |
46 |
/* IRIX is decidedly NON-unix */ |
47 |
# if __sgi |
48 |
# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8) |
49 |
# define STACK_ADJUST_SIZE(sp,ss) ((ss) - 8) |
50 |
# elif (__i386__ && CORO_LINUX) || (_M_IX86 && CORO_LOSER) |
51 |
# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss)) |
52 |
# define STACK_ADJUST_SIZE(sp,ss) (ss) |
53 |
# elif (__amd64__ && CORO_LINUX) || ((_M_AMD64 || _M_IA64) && CORO_LOSER) |
54 |
# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8) |
55 |
# define STACK_ADJUST_SIZE(sp,ss) (ss) |
56 |
# else |
57 |
# define STACK_ADJUST_PTR(sp,ss) (sp) |
58 |
# define STACK_ADJUST_SIZE(sp,ss) (ss) |
59 |
# endif |
60 |
#endif |
61 |
|
62 |
#if CORO_UCONTEXT |
63 |
# include <stddef.h> |
64 |
#endif |
65 |
|
66 |
#if CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM |
67 |
|
68 |
# include <stdlib.h> |
69 |
|
70 |
# if CORO_SJLJ |
71 |
# include <stdio.h> |
72 |
# include <signal.h> |
73 |
# include <unistd.h> |
74 |
# endif |
75 |
|
76 |
static volatile coro_func coro_init_func; |
77 |
static volatile void *coro_init_arg; |
78 |
static volatile coro_context *new_coro, *create_coro; |
79 |
|
80 |
/* what we really want to detect here is wether we use a new-enough version of GAS */ |
81 |
/* instead, check for gcc 3, ELF and GNU/Linux and hope for the best */ |
82 |
# if __GNUC__ >= 3 && __ELF__ && __linux__ |
83 |
# define HAVE_CFI 1 |
84 |
# endif |
85 |
|
86 |
static void |
87 |
coro_init (void) |
88 |
{ |
89 |
volatile coro_func func = coro_init_func; |
90 |
volatile void *arg = coro_init_arg; |
91 |
|
92 |
coro_transfer ((coro_context *)new_coro, (coro_context *)create_coro); |
93 |
|
94 |
func ((void *)arg); |
95 |
|
96 |
/* the new coro returned. bad. just abort() for now */ |
97 |
abort (); |
98 |
} |
99 |
|
100 |
# if CORO_SJLJ |
101 |
|
102 |
static volatile int trampoline_count; |
103 |
|
104 |
/* trampoline signal handler */ |
105 |
static void |
106 |
trampoline (int sig) |
107 |
{ |
108 |
if (setjmp (((coro_context *)new_coro)->env)) |
109 |
{ |
110 |
# if HAVE_CFI |
111 |
asm (".cfi_startproc"); |
112 |
# endif |
113 |
coro_init (); /* start it */ |
114 |
# if HAVE_CFI |
115 |
asm (".cfi_endproc"); |
116 |
# endif |
117 |
} |
118 |
else |
119 |
trampoline_count++; |
120 |
} |
121 |
|
122 |
# endif |
123 |
|
124 |
#endif |
125 |
|
126 |
#if CORO_ASM |
127 |
|
128 |
asm ( |
129 |
".text\n" |
130 |
".globl coro_transfer\n" |
131 |
".type coro_transfer, @function\n" |
132 |
"coro_transfer:\n" |
133 |
# if __amd64 |
134 |
# define NUM_SAVED 6 |
135 |
"\tpush %rbp\n" |
136 |
"\tpush %rbx\n" |
137 |
"\tpush %r12\n" |
138 |
"\tpush %r13\n" |
139 |
"\tpush %r14\n" |
140 |
"\tpush %r15\n" |
141 |
"\tmov %rsp, (%rdi)\n" |
142 |
"\tmov (%rsi), %rsp\n" |
143 |
"\tpop %r15\n" |
144 |
"\tpop %r14\n" |
145 |
"\tpop %r13\n" |
146 |
"\tpop %r12\n" |
147 |
"\tpop %rbx\n" |
148 |
"\tpop %rbp\n" |
149 |
# elif __i386 |
150 |
# define NUM_SAVED 4 |
151 |
"\tpush %ebp\n" |
152 |
"\tpush %ebx\n" |
153 |
"\tpush %esi\n" |
154 |
"\tpush %edi\n" |
155 |
"\tmov %esp, (%eax)\n" |
156 |
"\tmov (%edx), %esp\n" |
157 |
"\tpop %edi\n" |
158 |
"\tpop %esi\n" |
159 |
"\tpop %ebx\n" |
160 |
"\tpop %ebp\n" |
161 |
# else |
162 |
# error unsupported architecture |
163 |
# endif |
164 |
"\tret\n" |
165 |
); |
166 |
|
167 |
#endif |
168 |
|
169 |
#if CORO_PTHREAD |
170 |
|
171 |
/* this mutex will be locked by the running coroutine */ |
172 |
pthread_mutex_t coro_mutex = PTHREAD_MUTEX_INITIALIZER; |
173 |
|
174 |
struct coro_init_args |
175 |
{ |
176 |
coro_func func; |
177 |
void *arg; |
178 |
coro_context *self, *main; |
179 |
}; |
180 |
|
181 |
static pthread_t null_tid; |
182 |
|
183 |
/* I'd so love to cast pthread_mutex_unlock to void (*)(void *)... */ |
184 |
static void |
185 |
mutex_unlock_wrapper (void *arg) |
186 |
{ |
187 |
pthread_mutex_unlock ((pthread_mutex_t *)arg); |
188 |
} |
189 |
|
190 |
static void * |
191 |
trampoline (void *args_) |
192 |
{ |
193 |
struct coro_init_args *args = (struct coro_init_args *)args_; |
194 |
coro_func func = args->func; |
195 |
void *arg = args->arg; |
196 |
|
197 |
pthread_mutex_lock (&coro_mutex); |
198 |
|
199 |
/* we try to be good citizens and use deferred cancellation and cleanup handlers */ |
200 |
pthread_cleanup_push (mutex_unlock_wrapper, &coro_mutex); |
201 |
coro_transfer (args->self, args->main); |
202 |
func (arg); |
203 |
pthread_cleanup_pop (1); |
204 |
|
205 |
return 0; |
206 |
} |
207 |
|
208 |
void |
209 |
coro_transfer (coro_context *prev, coro_context *next) |
210 |
{ |
211 |
pthread_cond_signal (&next->cv); |
212 |
pthread_cond_wait (&prev->cv, &coro_mutex); |
213 |
} |
214 |
|
215 |
void |
216 |
coro_destroy (coro_context *ctx) |
217 |
{ |
218 |
if (!pthread_equal (ctx->id, null_tid)) |
219 |
{ |
220 |
pthread_cancel (ctx->id); |
221 |
pthread_mutex_unlock (&coro_mutex); |
222 |
pthread_join (ctx->id, 0); |
223 |
pthread_mutex_lock (&coro_mutex); |
224 |
} |
225 |
|
226 |
pthread_cond_destroy (&ctx->cv); |
227 |
} |
228 |
|
229 |
#endif |
230 |
|
231 |
/* initialize a machine state */ |
232 |
void |
233 |
coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize) |
234 |
{ |
235 |
#if CORO_UCONTEXT |
236 |
|
237 |
if (!coro) |
238 |
return; |
239 |
|
240 |
getcontext (&(ctx->uc)); |
241 |
|
242 |
ctx->uc.uc_link = 0; |
243 |
ctx->uc.uc_stack.ss_sp = STACK_ADJUST_PTR (sptr,ssize); |
244 |
ctx->uc.uc_stack.ss_size = (size_t)STACK_ADJUST_SIZE (sptr,ssize); |
245 |
ctx->uc.uc_stack.ss_flags = 0; |
246 |
|
247 |
makecontext (&(ctx->uc), (void (*)())coro, 1, arg); |
248 |
|
249 |
#elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM |
250 |
|
251 |
# if CORO_SJLJ |
252 |
stack_t ostk, nstk; |
253 |
struct sigaction osa, nsa; |
254 |
sigset_t nsig, osig; |
255 |
# endif |
256 |
coro_context nctx; |
257 |
|
258 |
if (!coro) |
259 |
return; |
260 |
|
261 |
coro_init_func = coro; |
262 |
coro_init_arg = arg; |
263 |
|
264 |
new_coro = ctx; |
265 |
create_coro = &nctx; |
266 |
|
267 |
# if CORO_SJLJ |
268 |
/* we use SIGUSR2. first block it, then fiddle with it. */ |
269 |
|
270 |
sigemptyset (&nsig); |
271 |
sigaddset (&nsig, SIGUSR2); |
272 |
sigprocmask (SIG_BLOCK, &nsig, &osig); |
273 |
|
274 |
nsa.sa_handler = trampoline; |
275 |
sigemptyset (&nsa.sa_mask); |
276 |
nsa.sa_flags = SA_ONSTACK; |
277 |
|
278 |
if (sigaction (SIGUSR2, &nsa, &osa)) |
279 |
{ |
280 |
perror ("sigaction"); |
281 |
abort (); |
282 |
} |
283 |
|
284 |
/* set the new stack */ |
285 |
nstk.ss_sp = STACK_ADJUST_PTR (sptr,ssize); /* yes, some platforms (IRIX) get this wrong. */ |
286 |
nstk.ss_size = STACK_ADJUST_SIZE (sptr,ssize); |
287 |
nstk.ss_flags = 0; |
288 |
|
289 |
if (sigaltstack (&nstk, &ostk) < 0) |
290 |
{ |
291 |
perror ("sigaltstack"); |
292 |
abort (); |
293 |
} |
294 |
|
295 |
trampoline_count = 0; |
296 |
kill (getpid (), SIGUSR2); |
297 |
sigfillset (&nsig); sigdelset (&nsig, SIGUSR2); |
298 |
|
299 |
while (!trampoline_count) |
300 |
sigsuspend (&nsig); |
301 |
|
302 |
sigaltstack (0, &nstk); |
303 |
nstk.ss_flags = SS_DISABLE; |
304 |
if (sigaltstack (&nstk, 0) < 0) |
305 |
perror ("sigaltstack"); |
306 |
|
307 |
sigaltstack (0, &nstk); |
308 |
if (~nstk.ss_flags & SS_DISABLE) |
309 |
abort (); |
310 |
|
311 |
if (~ostk.ss_flags & SS_DISABLE) |
312 |
sigaltstack (&ostk, 0); |
313 |
|
314 |
sigaction (SIGUSR2, &osa, 0); |
315 |
|
316 |
sigprocmask (SIG_SETMASK, &osig, 0); |
317 |
|
318 |
# elif CORO_LOSER |
319 |
|
320 |
setjmp (ctx->env); |
321 |
#if __CYGWIN__ |
322 |
ctx->env[7] = (long)((char *)sptr + ssize) - sizeof (long); |
323 |
ctx->env[8] = (long)coro_init; |
324 |
#elif defined(_M_IX86) |
325 |
((_JUMP_BUFFER *)&ctx->env)->Eip = (long)coro_init; |
326 |
((_JUMP_BUFFER *)&ctx->env)->Esp = (long)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
327 |
#elif defined(_M_AMD64) |
328 |
((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64)coro_init; |
329 |
((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
330 |
#elif defined(_M_IA64) |
331 |
((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64)coro_init; |
332 |
((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
333 |
#else |
334 |
# error "microsoft libc or architecture not supported" |
335 |
#endif |
336 |
|
337 |
# elif CORO_LINUX |
338 |
|
339 |
_setjmp (ctx->env); |
340 |
#if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP) |
341 |
ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init; |
342 |
ctx->env[0].__jmpbuf[JB_SP] = (long)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
343 |
#elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__) |
344 |
ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init; |
345 |
ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize) - sizeof (long); |
346 |
#elif defined (__GNU_LIBRARY__) && defined (__i386__) |
347 |
ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init; |
348 |
ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize) - sizeof (long); |
349 |
#elif defined (__GNU_LIBRARY__) && defined (__amd64__) |
350 |
ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init; |
351 |
ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize) - sizeof (long); |
352 |
#else |
353 |
# error "linux libc or architecture not supported" |
354 |
#endif |
355 |
|
356 |
# elif CORO_IRIX |
357 |
|
358 |
setjmp (ctx->env); |
359 |
ctx->env[JB_PC] = (__uint64_t)coro_init; |
360 |
ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
361 |
|
362 |
# elif CORO_ASM |
363 |
|
364 |
ctx->sp = (volatile void **)(ssize + (char *)sptr); |
365 |
*--ctx->sp = (void *)abort; /* needed for alignment only */ |
366 |
*--ctx->sp = (void *)coro_init; |
367 |
ctx->sp -= NUM_SAVED; |
368 |
|
369 |
# endif |
370 |
|
371 |
coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro); |
372 |
|
373 |
# elif CORO_PTHREAD |
374 |
|
375 |
static coro_context nctx; |
376 |
static int once; |
377 |
|
378 |
if (!once) |
379 |
{ |
380 |
once = 1; |
381 |
|
382 |
pthread_mutex_lock (&coro_mutex); |
383 |
pthread_cond_init (&nctx.cv, 0); |
384 |
null_tid = pthread_self (); |
385 |
} |
386 |
|
387 |
pthread_cond_init (&ctx->cv, 0); |
388 |
|
389 |
if (coro) |
390 |
{ |
391 |
pthread_attr_t attr; |
392 |
struct coro_init_args args; |
393 |
|
394 |
args.func = coro; |
395 |
args.arg = arg; |
396 |
args.self = ctx; |
397 |
args.main = &nctx; |
398 |
|
399 |
pthread_attr_init (&attr); |
400 |
pthread_attr_setstack (&attr, sptr, (size_t)ssize); |
401 |
pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS); |
402 |
pthread_create (&ctx->id, &attr, trampoline, &args); |
403 |
|
404 |
coro_transfer (args.main, args.self); |
405 |
} |
406 |
else |
407 |
ctx->id = null_tid; |
408 |
|
409 |
#else |
410 |
# error unsupported backend |
411 |
#endif |
412 |
} |
413 |
|