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Comparing libcoro/coro.c (file contents):
Revision 1.27 by root, Wed May 2 05:53:26 2007 UTC vs.
Revision 1.35 by root, Mon Nov 3 16:05:38 2008 UTC

1/* 1/*
2 * Copyright (c) 2001-2006 Marc Alexander Lehmann <schmorp@schmorp.de> 2 * Copyright (c) 2001-2008 Marc Alexander Lehmann <schmorp@schmorp.de>
3 * 3 *
4 * Redistribution and use in source and binary forms, with or without modifica- 4 * Redistribution and use in source and binary forms, with or without modifica-
5 * tion, are permitted provided that the following conditions are met: 5 * tion, are permitted provided that the following conditions are met:
6 * 6 *
7 * 1. Redistributions of source code must retain the above copyright notice, 7 * 1. Redistributions of source code must retain the above copyright notice,
8 * this list of conditions and the following disclaimer. 8 * this list of conditions and the following disclaimer.
9 * 9 *
10 * 2. Redistributions in binary form must reproduce the above copyright 10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the 11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution. 12 * documentation and/or other materials provided with the distribution.
13 *
14 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 * 13 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- 15 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
19 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO 16 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
20 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- 17 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
… …
23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 20 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- 21 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
25 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 22 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
26 * OF THE POSSIBILITY OF SUCH DAMAGE. 23 * OF THE POSSIBILITY OF SUCH DAMAGE.
27 * 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 *
28 * This library is modelled strictly after Ralf S. Engelschalls article at 36 * This library is modelled strictly after Ralf S. Engelschalls article at
29 * http://www.gnu.org/software/pth/rse-pmt.ps. So most of the credit must 37 * http://www.gnu.org/software/pth/rse-pmt.ps. So most of the credit must
30 * go to Ralf S. Engelschall <rse@engelschall.com>. 38 * go to Ralf S. Engelschall <rse@engelschall.com>.
31 */ 39 */
32 40
33#include "coro.h" 41#include "coro.h"
34 42
35#if !defined(STACK_ADJUST_PTR) 43#if !defined(STACK_ADJUST_PTR)
36/* IRIX is decidedly NON-unix */ 44/* IRIX is decidedly NON-unix */
37# if __sgi 45# if __sgi
38# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8) 46# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8)
39# define STACK_ADJUST_SIZE(sp,ss) ((ss) - 8) 47# define STACK_ADJUST_SIZE(sp,ss) ((ss) - 8)
40# elif __i386__ && CORO_LINUX 48# elif (__i386__ && CORO_LINUX) || (_M_IX86 && CORO_LOSER)
41# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss)) 49# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss))
42# define STACK_ADJUST_SIZE(sp,ss) (ss) 50# define STACK_ADJUST_SIZE(sp,ss) (ss)
43# elif __amd64__ && CORO_LINUX 51# elif (__amd64__ && CORO_LINUX) || ((_M_AMD64 || _M_IA64) && CORO_LOSER)
44# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8) 52# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8)
45# define STACK_ADJUST_SIZE(sp,ss) (ss) 53# define STACK_ADJUST_SIZE(sp,ss) (ss)
46# else 54# else
47# define STACK_ADJUST_PTR(sp,ss) (sp) 55# define STACK_ADJUST_PTR(sp,ss) (sp)
48# define STACK_ADJUST_SIZE(sp,ss) (ss) 56# define STACK_ADJUST_SIZE(sp,ss) (ss)
… …
66static volatile coro_func coro_init_func; 74static volatile coro_func coro_init_func;
67static volatile void *coro_init_arg; 75static volatile void *coro_init_arg;
68static volatile coro_context *new_coro, *create_coro; 76static volatile coro_context *new_coro, *create_coro;
69 77
70/* what we really want to detect here is wether we use a new-enough version of GAS */ 78/* what we really want to detect here is wether we use a new-enough version of GAS */
71/* instead, check for gcc 3 and ELF and hope for the best */ 79/* instead, check for gcc 3, ELF and GNU/Linux and hope for the best */
72#if __GNUC__ >= 3 && __ELF__ 80#if __GNUC__ >= 3 && __ELF__ && __linux__
73# define HAVE_CFI 1 81# define HAVE_CFI 1
74#endif 82#endif
75 83
76static void 84static void
77coro_init (void) 85coro_init (void)
… …
112# endif 120# endif
113 121
114#endif 122#endif
115 123
116#if CORO_ASM 124#if CORO_ASM
117void __attribute__((__noinline__, __fastcall__)) 125asm (
118coro_transfer (struct coro_context *prev, struct coro_context *next) 126 ".text\n"
119{ 127 ".globl coro_transfer\n"
120 asm volatile ( 128 ".type coro_transfer, @function\n"
129 "coro_transfer:\n"
121#if __amd64 130#if __amd64
122# define NUM_CLOBBERED 5 131# define NUM_SAVED 5
123 "push %%rbx\n\t" 132 "\tpush %rbx\n"
124 "push %%r12\n\t" 133 "\tpush %r12\n"
125 "push %%r13\n\t" 134 "\tpush %r13\n"
126 "push %%r14\n\t" 135 "\tpush %r14\n"
127 "push %%r15\n\t" 136 "\tpush %r15\n"
128 "mov %%rsp, %0\n\t" 137 "\tmov %rsp, (%rdi)\n"
129 "mov %1, %%rsp\n\t" 138 "\tmov (%rsi), %rsp\n"
130 "pop %%r15\n\t" 139 "\tpop %r15\n"
131 "pop %%r14\n\t" 140 "\tpop %r14\n"
132 "pop %%r13\n\t" 141 "\tpop %r13\n"
133 "pop %%r12\n\t" 142 "\tpop %r12\n"
134 "pop %%rbx\n\t" 143 "\tpop %rbx\n"
135#elif __i386 144#elif __i386
136# define NUM_CLOBBERED 4 145# define NUM_SAVED 4
137 "push %%ebx\n\t" 146 "\tpush %ebx\n"
138 "push %%esi\n\t" 147 "\tpush %esi\n"
139 "push %%edi\n\t" 148 "\tpush %edi\n"
140 "push %%ebp\n\t" 149 "\tpush %ebp\n"
141 "mov %%esp, %0\n\t" 150 "\tmov %esp, (%eax)\n"
142 "mov %1, %%esp\n\t" 151 "\tmov (%edx), %esp\n"
143 "pop %%ebp\n\t" 152 "\tpop %ebp\n"
144 "pop %%edi\n\t" 153 "\tpop %edi\n"
145 "pop %%esi\n\t" 154 "\tpop %esi\n"
146 "pop %%ebx\n\t" 155 "\tpop %ebx\n"
147#else 156#else
148# error unsupported architecture 157# error unsupported architecture
149#endif 158#endif
150 : "=m" (prev->sp) 159 "\tret\n"
151 : "m" (next->sp) 160);
152 ); 161#endif
162
163#if CORO_PTHREAD
164
165struct coro_init_args {
166 coro_func func;
167 void *arg;
168 coro_context *self, *main;
169};
170
171pthread_mutex_t coro_mutex = PTHREAD_MUTEX_INITIALIZER;
172
173static void *
174trampoline (void *args_)
175{
176 struct coro_init_args *args = (struct coro_init_args *)args_;
177 coro_func func = args->func;
178 void *arg = args->arg;
179
180 pthread_mutex_lock (&coro_mutex);
181 pthread_cond_destroy (&args->self->c);
182 coro_transfer (args->self, args->main);
183 func (arg);
184 pthread_mutex_unlock (&coro_mutex);
185
186 return 0;
153} 187}
188
189asm("");
190
191void coro_transfer(coro_context *prev, coro_context *next)
192{
193 pthread_cond_init (&prev->c, 0);
194 pthread_cond_signal (&next->c);
195 pthread_cond_wait (&prev->c, &coro_mutex);
196 pthread_cond_destroy (&prev->c);
197}
198
154#endif 199#endif
155 200
156/* initialize a machine state */ 201/* initialize a machine state */
157void coro_create (coro_context *ctx, 202void coro_create (coro_context *ctx,
158 coro_func coro, void *arg, 203 coro_func coro, void *arg,
… …
241#if __CYGWIN__ 286#if __CYGWIN__
242 ctx->env[7] = (long)((char *)sptr + ssize); 287 ctx->env[7] = (long)((char *)sptr + ssize);
243 ctx->env[8] = (long)coro_init; 288 ctx->env[8] = (long)coro_init;
244#elif defined(_M_IX86) 289#elif defined(_M_IX86)
245 ((_JUMP_BUFFER *)&ctx->env)->Eip = (long)coro_init; 290 ((_JUMP_BUFFER *)&ctx->env)->Eip = (long)coro_init;
246 ((_JUMP_BUFFER *)&ctx->env)->Esp = (long)STACK_ADJUST_PTR (sptr,ssize); 291 ((_JUMP_BUFFER *)&ctx->env)->Esp = (long)STACK_ADJUST_PTR (sptr, ssize);
247#elif defined(_M_AMD64) 292#elif defined(_M_AMD64)
248 ((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64)coro_init; 293 ((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64)coro_init;
249 ((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64)STACK_ADJUST_PTR (sptr,ssize); 294 ((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64)STACK_ADJUST_PTR (sptr, ssize);
250#elif defined(_M_IA64) 295#elif defined(_M_IA64)
251 ((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64)coro_init; 296 ((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64)coro_init;
252 ((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64)STACK_ADJUST_PTR (sptr,ssize); 297 ((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64)STACK_ADJUST_PTR (sptr, ssize);
253#else 298#else
254#error "microsoft libc or architecture not supported" 299# error "microsoft libc or architecture not supported"
255#endif 300#endif
256 301
257# elif CORO_LINUX 302# elif CORO_LINUX
258 303
259 _setjmp (ctx->env); 304 _setjmp (ctx->env);
… …
280 ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize); 325 ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize);
281 326
282# elif CORO_ASM 327# elif CORO_ASM
283 328
284 ctx->sp = (volatile void **)(ssize + (char *)sptr); 329 ctx->sp = (volatile void **)(ssize + (char *)sptr);
330 /* we try to allow for both functions with and without frame pointers */
285 *--ctx->sp = (void *)coro_init; 331 *--ctx->sp = (void *)coro_init;
286 *--ctx->sp = (void *)coro_init; // this is needed when the prologue saves ebp 332 {
287 ctx->sp -= NUM_CLOBBERED; 333 int i;
334 for (i = NUM_SAVED; i--; )
335 *--ctx->sp = 0;
336 }
288 337
289# endif 338# endif
290 339
291 coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro); 340 coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro);
292 341
342# elif CORO_PTHREAD
343
344 pthread_t id;
345 pthread_attr_t attr;
346 coro_context nctx;
347 struct coro_init_args args;
348 static int once;
349
350 if (!once)
351 {
352 pthread_mutex_lock (&coro_mutex);
353 once = 1;
354 }
355
356 args.func = coro;
357 args.arg = arg;
358 args.self = ctx;
359 args.main = &nctx;
360
361 pthread_attr_init (&attr);
362 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
363 pthread_attr_setstack (&attr, sptr, (size_t)ssize);
364 pthread_create (&id, &attr, trampoline, &args);
365
366 pthread_cond_init (&args.self->c, 0);
367 coro_transfer (args.main, args.self);
368
293#else 369#else
294# error unsupported architecture 370# error unsupported backend
295#endif 371#endif
296} 372}
297 373

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