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Comparing libcoro/coro.c (file contents):
Revision 1.3 by root, Mon Jul 23 22:16:38 2001 UTC vs.
Revision 1.31 by root, Thu Apr 24 12:40:38 2008 UTC

1/* 1/*
2 * Copyright (c) 2001 Marc Alexander Lehmann <pcg@goof.com> 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 CORO_LOOSE || CORO_SJLJ 43#if !defined(STACK_ADJUST_PTR)
44/* IRIX is decidedly NON-unix */
45# if __sgi
46# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8)
47# define STACK_ADJUST_SIZE(sp,ss) ((ss) - 8)
48# elif (__i386__ && CORO_LINUX) || (_M_IX86 && CORO_LOSER)
49# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss))
50# define STACK_ADJUST_SIZE(sp,ss) (ss)
51# elif (__amd64__ && CORO_LINUX) || ((_M_AMD64 || _M_IA64) && CORO_LOSER)
52# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8)
53# define STACK_ADJUST_SIZE(sp,ss) (ss)
54# else
55# define STACK_ADJUST_PTR(sp,ss) (sp)
56# define STACK_ADJUST_SIZE(sp,ss) (ss)
57# endif
58#endif
36 59
60#if CORO_UCONTEXT
61# include <stddef.h>
62#endif
63
64#if CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM
65
66#include <stdlib.h>
67
68#if CORO_SJLJ
69# include <stdio.h>
37#include <signal.h> 70# include <signal.h>
71# include <unistd.h>
72#endif
38 73
39static volatile coro_func coro_init_func; 74static volatile coro_func coro_init_func;
40static volatile void *coro_init_arg; 75static volatile void *coro_init_arg;
41static volatile coro_context *new_coro, *create_coro; 76static volatile coro_context *new_coro, *create_coro;
42 77
78/* what we really want to detect here is wether we use a new-enough version of GAS */
79/* instead, check for gcc 3, ELF and GNU/Linux and hope for the best */
80#if __GNUC__ >= 3 && __ELF__ && __linux__
81# define HAVE_CFI 1
82#endif
83
43static void 84static void
44coro_init (void) 85coro_init (void)
45{ 86{
46 volatile coro_func func = coro_init_func; 87 volatile coro_func func = coro_init_func;
47 volatile void *arg = coro_init_arg; 88 volatile void *arg = coro_init_arg;
… …
53 /* the new coro returned. bad. just abort() for now */ 94 /* the new coro returned. bad. just abort() for now */
54 abort (); 95 abort ();
55} 96}
56 97
57# if CORO_SJLJ 98# if CORO_SJLJ
58# define coro_save(ctx) (void)setjmp((ctx)->env)
59 99
60static volatile int trampoline_count; 100static volatile int trampoline_count;
61 101
62/* trampoline signal handler */ 102/* trampoline signal handler */
63static void 103static void
64trampoline(int sig) 104trampoline (int sig)
65{ 105{
66 if (setjmp (((coro_context *)new_coro)->env)) 106 if (setjmp (((coro_context *)new_coro)->env))
107 {
108#if HAVE_CFI
109 asm (".cfi_startproc");
110#endif
67 coro_init (); /* start it */ 111 coro_init (); /* start it */
112#if HAVE_CFI
113 asm (".cfi_endproc");
114#endif
115 }
68 else 116 else
69 trampoline_count++; 117 trampoline_count++;
70} 118}
71 119
72# endif 120# endif
73 121
74#elif CORO_UCONTEXT 122#endif
75# define coro_save(ctx) getcontext(&((ctx)->uc)) 123
124#if CORO_ASM
125void __attribute__((__noinline__, __fastcall__))
126coro_transfer (struct coro_context *prev, struct coro_context *next)
127{
128 asm volatile (
129#if __amd64
130# define NUM_CLOBBERED 5
131 "push %%rbx\n\t"
132 "push %%r12\n\t"
133 "push %%r13\n\t"
134 "push %%r14\n\t"
135 "push %%r15\n\t"
136 "mov %%rsp, %0\n\t"
137 "mov %1, %%rsp\n\t"
138 "pop %%r15\n\t"
139 "pop %%r14\n\t"
140 "pop %%r13\n\t"
141 "pop %%r12\n\t"
142 "pop %%rbx\n\t"
143#elif __i386
144# define NUM_CLOBBERED 4
145 "push %%ebx\n\t"
146 "push %%esi\n\t"
147 "push %%edi\n\t"
148 "push %%ebp\n\t"
149 "mov %%esp, %0\n\t"
150 "mov %1, %%esp\n\t"
151 "pop %%ebp\n\t"
152 "pop %%edi\n\t"
153 "pop %%esi\n\t"
154 "pop %%ebx\n\t"
155#else
156# error unsupported architecture
157#endif
158 : "=m" (prev->sp)
159 : "m" (next->sp)
160 );
161}
162#endif
163
164#if CORO_PTHREAD
165
166struct coro_init_args {
167 coro_func func;
168 void *arg;
169 coro_context *self, *main;
170};
171
172pthread_mutex_t coro_mutex = PTHREAD_MUTEX_INITIALIZER;
173
174static void *
175trampoline (void *args_)
176{
177 struct coro_init_args *args = (struct coro_init_args *)args_;
178 coro_func func = args->func;
179 void *arg = args->arg;
180
181 pthread_mutex_lock (&coro_mutex);
182 pthread_cond_destroy (&args->self->c);
183 coro_transfer (args->self, args->main);
184 func (arg);
185 pthread_mutex_unlock (&coro_mutex);
186
187 return 0;
188}
189
190void coro_transfer(coro_context *prev, coro_context *next)
191{
192 pthread_cond_init (&prev->c, 0);
193 pthread_cond_signal (&next->c);
194 pthread_cond_wait (&prev->c, &coro_mutex);
195 pthread_cond_destroy (&prev->c);
196}
197
76#endif 198#endif
77 199
78/* initialize a machine state */ 200/* initialize a machine state */
79void coro_create(coro_context *ctx, 201void coro_create (coro_context *ctx,
80 coro_func coro, void *arg, 202 coro_func coro, void *arg,
81 void *sptr, long ssize) 203 void *sptr, long ssize)
82{ 204{
83#if CORO_UCONTEXT 205#if CORO_UCONTEXT
84 206
85 getcontext (&(ctx->uc)); 207 getcontext (&(ctx->uc));
86 208
87 ctx->uc.uc_link = 0; 209 ctx->uc.uc_link = 0;
88 ctx->uc.uc_stack.ss_sp = sptr; 210 ctx->uc.uc_stack.ss_sp = STACK_ADJUST_PTR (sptr,ssize);
89 ctx->uc.uc_stack.ss_size = (size_t) ssize; 211 ctx->uc.uc_stack.ss_size = (size_t) STACK_ADJUST_SIZE (sptr,ssize);
90 ctx->uc.uc_stack.ss_flags = 0; 212 ctx->uc.uc_stack.ss_flags = 0;
91 213
92 makecontext (&(ctx->uc), (void (*)()) coro, 1, arg); 214 makecontext (&(ctx->uc), (void (*)()) coro, 1, arg);
93 215
94#elif CORO_SJLJ || CORO_LOOSE 216#elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM
95 217
96# if CORO_SJLJ 218# if CORO_SJLJ
97 stack_t ostk, nstk; 219 stack_t ostk, nstk;
98 struct sigaction osa, nsa; 220 struct sigaction osa, nsa;
99 sigset_t nsig, osig; 221 sigset_t nsig, osig;
… …
116 nsa.sa_handler = trampoline; 238 nsa.sa_handler = trampoline;
117 sigemptyset (&nsa.sa_mask); 239 sigemptyset (&nsa.sa_mask);
118 nsa.sa_flags = SA_ONSTACK; 240 nsa.sa_flags = SA_ONSTACK;
119 241
120 if (sigaction (SIGUSR2, &nsa, &osa)) 242 if (sigaction (SIGUSR2, &nsa, &osa))
243 {
121 perror ("sigaction"); 244 perror ("sigaction");
245 abort ();
246 }
122 247
123 /* set the new stack */ 248 /* set the new stack */
124 nstk.ss_sp = sptr; 249 nstk.ss_sp = STACK_ADJUST_PTR (sptr,ssize); /* yes, some platforms (IRIX) get this wrong. */
125 nstk.ss_size = ssize; 250 nstk.ss_size = STACK_ADJUST_SIZE (sptr,ssize);
126 nstk.ss_flags = 0; 251 nstk.ss_flags = 0;
127 252
128 if (sigaltstack (&nstk, &ostk) < 0) 253 if (sigaltstack (&nstk, &ostk) < 0)
254 {
129 perror ("sigaltstack"); 255 perror ("sigaltstack");
256 abort ();
257 }
130 258
131 trampoline_count = 0; 259 trampoline_count = 0;
132 kill (getpid (), SIGUSR2); 260 kill (getpid (), SIGUSR2);
133 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2); 261 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2);
134 262
… …
145 abort (); 273 abort ();
146 274
147 if (~ostk.ss_flags & SS_DISABLE) 275 if (~ostk.ss_flags & SS_DISABLE)
148 sigaltstack (&ostk, 0); 276 sigaltstack (&ostk, 0);
149 277
150 sigaction (SIGUSR1, &osa, 0); 278 sigaction (SIGUSR2, &osa, 0);
151 279
152 sigprocmask (SIG_SETMASK, &osig, 0); 280 sigprocmask (SIG_SETMASK, &osig, 0);
153 281
154# elif MS_LOOSE 282# elif CORO_LOSER
155 283
156 coro_save (ctx); 284 setjmp (ctx->env);
285#if __CYGWIN__
157 ctx->env[7] = (int)((char *)sptr + ssize); 286 ctx->env[7] = (long)((char *)sptr + ssize);
158 ctx->env[8] = (int)coro; 287 ctx->env[8] = (long)coro_init;
288#elif defined(_M_IX86)
289 ((_JUMP_BUFFER *)&ctx->env)->Eip = (long)coro_init;
290 ((_JUMP_BUFFER *)&ctx->env)->Esp = (long)STACK_ADJUST_PTR (sptr, ssize);
291#elif defined(_M_AMD64)
292 ((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64)coro_init;
293 ((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64)STACK_ADJUST_PTR (sptr, ssize);
294#elif defined(_M_IA64)
295 ((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64)coro_init;
296 ((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64)STACK_ADJUST_PTR (sptr, ssize);
297#else
298# error "microsoft libc or architecture not supported"
299#endif
300
301# elif CORO_LINUX
302
303 _setjmp (ctx->env);
304#if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP)
305 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
306 ctx->env[0].__jmpbuf[JB_SP] = (long)STACK_ADJUST_PTR (sptr, ssize);
307#elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__)
308 ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init;
309 ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize);
310#elif defined (__GNU_LIBRARY__) && defined (__i386__)
311 ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init;
312 ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize);
313#elif defined (__GNU_LIBRARY__) && defined (__amd64__)
314 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
315 ctx->env[0].__jmpbuf[JB_RSP] = (long)STACK_ADJUST_PTR (sptr, ssize);
316#else
317# error "linux libc or architecture not supported"
318#endif
319
320# elif CORO_IRIX
321
322 setjmp (ctx->env);
323 ctx->env[JB_PC] = (__uint64_t)coro_init;
324 ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize);
325
326# elif CORO_ASM
327
328 ctx->sp = (volatile void **)(ssize + (char *)sptr);
329 *--ctx->sp = (void *)coro_init;
330 *--ctx->sp = (void *)coro_init; // this is needed when the prologue saves ebp
331 ctx->sp -= NUM_CLOBBERED;
159 332
160# endif 333# endif
161 334
162 coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro); 335 coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro);
163 336
337# elif CORO_PTHREAD
338
339 pthread_t id;
340 pthread_attr_t attr;
341 coro_context nctx;
342 struct coro_init_args args;
343 static int once;
344
345 if (!once)
346 {
347 pthread_mutex_lock (&coro_mutex);
348 once = 1;
349 }
350
351 args.func = coro;
352 args.arg = arg;
353 args.self = ctx;
354 args.main = &nctx;
355
356 pthread_attr_init (&attr);
357 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
358 pthread_attr_setstack (&attr, sptr, (size_t)ssize);
359 pthread_create (&id, &attr, trampoline, &args);
360
361 pthread_cond_init (&args.self->c, 0);
362 coro_transfer (args.main, args.self);
363
164#else 364#else
165error unsupported architecture 365# error unsupported backend
166#endif 366#endif
167} 367}
168 368

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