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Comparing libcoro/coro.c (file contents):
Revision 1.4 by root, Tue Jul 24 19:52:55 2001 UTC vs.
Revision 1.36 by root, Wed Nov 5 01:54:34 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 || CORO_LINUX 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
125asm (
126 ".text\n"
127 ".globl coro_transfer\n"
128 ".type coro_transfer, @function\n"
129 "coro_transfer:\n"
130#if __amd64
131# define NUM_ALIGN 1
132# define NUM_SAVED 5
133 "\tpush %rbx\n"
134 "\tpush %r12\n"
135 "\tpush %r13\n"
136 "\tpush %r14\n"
137 "\tpush %r15\n"
138 "\tmov %rsp, (%rdi)\n"
139 "\tmov (%rsi), %rsp\n"
140 "\tpop %r15\n"
141 "\tpop %r14\n"
142 "\tpop %r13\n"
143 "\tpop %r12\n"
144 "\tpop %rbx\n"
145#elif __i386
146# define NUM_ALIGN 1
147# define NUM_SAVED 4
148 "\tpush %ebx\n"
149 "\tpush %esi\n"
150 "\tpush %edi\n"
151 "\tpush %ebp\n"
152 "\tmov %esp, (%eax)\n"
153 "\tmov (%edx), %esp\n"
154 "\tpop %ebp\n"
155 "\tpop %edi\n"
156 "\tpop %esi\n"
157 "\tpop %ebx\n"
158#else
159# error unsupported architecture
160#endif
161 "\tret\n"
162);
163#endif
164
165#if CORO_PTHREAD
166
167struct coro_init_args {
168 coro_func func;
169 void *arg;
170 coro_context *self, *main;
171};
172
173pthread_mutex_t coro_mutex = PTHREAD_MUTEX_INITIALIZER;
174
175static void *
176trampoline (void *args_)
177{
178 struct coro_init_args *args = (struct coro_init_args *)args_;
179 coro_func func = args->func;
180 void *arg = args->arg;
181
182 pthread_mutex_lock (&coro_mutex);
183 pthread_cond_destroy (&args->self->c);
184 coro_transfer (args->self, args->main);
185 func (arg);
186 pthread_mutex_unlock (&coro_mutex);
187
188 return 0;
189}
190
191asm("");
192
193void coro_transfer(coro_context *prev, coro_context *next)
194{
195 pthread_cond_init (&prev->c, 0);
196 pthread_cond_signal (&next->c);
197 pthread_cond_wait (&prev->c, &coro_mutex);
198 pthread_cond_destroy (&prev->c);
199}
200
76#endif 201#endif
77 202
78/* initialize a machine state */ 203/* initialize a machine state */
79void coro_create(coro_context *ctx, 204void coro_create (coro_context *ctx,
80 coro_func coro, void *arg, 205 coro_func coro, void *arg,
81 void *sptr, long ssize) 206 void *sptr, long ssize)
82{ 207{
83#if CORO_UCONTEXT 208#if CORO_UCONTEXT
84 209
85 getcontext (&(ctx->uc)); 210 getcontext (&(ctx->uc));
86 211
87 ctx->uc.uc_link = 0; 212 ctx->uc.uc_link = 0;
88 ctx->uc.uc_stack.ss_sp = sptr; 213 ctx->uc.uc_stack.ss_sp = STACK_ADJUST_PTR (sptr,ssize);
89 ctx->uc.uc_stack.ss_size = (size_t) ssize; 214 ctx->uc.uc_stack.ss_size = (size_t)STACK_ADJUST_SIZE (sptr,ssize);
90 ctx->uc.uc_stack.ss_flags = 0; 215 ctx->uc.uc_stack.ss_flags = 0;
91 216
92 makecontext (&(ctx->uc), (void (*)()) coro, 1, arg); 217 makecontext (&(ctx->uc), (void (*)()) coro, 1, arg);
93 218
94#elif CORO_SJLJ || CORO_LOOSE || CORO_LINUX 219#elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM
95 220
96# if CORO_SJLJ 221# if CORO_SJLJ
97 stack_t ostk, nstk; 222 stack_t ostk, nstk;
98 struct sigaction osa, nsa; 223 struct sigaction osa, nsa;
99 sigset_t nsig, osig; 224 sigset_t nsig, osig;
… …
116 nsa.sa_handler = trampoline; 241 nsa.sa_handler = trampoline;
117 sigemptyset (&nsa.sa_mask); 242 sigemptyset (&nsa.sa_mask);
118 nsa.sa_flags = SA_ONSTACK; 243 nsa.sa_flags = SA_ONSTACK;
119 244
120 if (sigaction (SIGUSR2, &nsa, &osa)) 245 if (sigaction (SIGUSR2, &nsa, &osa))
246 {
121 perror ("sigaction"); 247 perror ("sigaction");
248 abort ();
249 }
122 250
123 /* set the new stack */ 251 /* set the new stack */
124 nstk.ss_sp = sptr; 252 nstk.ss_sp = STACK_ADJUST_PTR (sptr,ssize); /* yes, some platforms (IRIX) get this wrong. */
125 nstk.ss_size = ssize; 253 nstk.ss_size = STACK_ADJUST_SIZE (sptr,ssize);
126 nstk.ss_flags = 0; 254 nstk.ss_flags = 0;
127 255
128 if (sigaltstack (&nstk, &ostk) < 0) 256 if (sigaltstack (&nstk, &ostk) < 0)
257 {
129 perror ("sigaltstack"); 258 perror ("sigaltstack");
259 abort ();
260 }
130 261
131 trampoline_count = 0; 262 trampoline_count = 0;
132 kill (getpid (), SIGUSR2); 263 kill (getpid (), SIGUSR2);
133 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2); 264 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2);
134 265
… …
145 abort (); 276 abort ();
146 277
147 if (~ostk.ss_flags & SS_DISABLE) 278 if (~ostk.ss_flags & SS_DISABLE)
148 sigaltstack (&ostk, 0); 279 sigaltstack (&ostk, 0);
149 280
150 sigaction (SIGUSR1, &osa, 0); 281 sigaction (SIGUSR2, &osa, 0);
151 282
152 sigprocmask (SIG_SETMASK, &osig, 0); 283 sigprocmask (SIG_SETMASK, &osig, 0);
153 284
154# elif CORO_LOOSE 285# elif CORO_LOSER
155 286
156 setjmp (ctx->env); 287 setjmp (ctx->env);
288#if __CYGWIN__
157 ctx->env[7] = (int)((char *)sptr + ssize); 289 ctx->env[7] = (long)((char *)sptr + ssize) - sizeof (long);
158 ctx->env[8] = (int)coro_init; 290 ctx->env[8] = (long)coro_init;
291#elif defined(_M_IX86)
292 ((_JUMP_BUFFER *)&ctx->env)->Eip = (long)coro_init;
293 ((_JUMP_BUFFER *)&ctx->env)->Esp = (long)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
294#elif defined(_M_AMD64)
295 ((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64)coro_init;
296 ((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
297#elif defined(_M_IA64)
298 ((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64)coro_init;
299 ((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
300#else
301# error "microsoft libc or architecture not supported"
302#endif
159 303
160# elif CORO_LINUX 304# elif CORO_LINUX
161 305
306 _setjmp (ctx->env);
307#if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP)
308 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
309 ctx->env[0].__jmpbuf[JB_SP] = (long)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
310#elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__)
311 ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init;
312 ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize) - sizeof (long);
313#elif defined (__GNU_LIBRARY__) && defined (__i386__)
314 ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init;
315 ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize) - sizeof (long);
316#elif defined (__GNU_LIBRARY__) && defined (__amd64__)
317 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
318 ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize) - sizeof (long);
319#else
320# error "linux libc or architecture not supported"
321#endif
322
323# elif CORO_IRIX
324
162 setjmp (ctx->env); 325 setjmp (ctx->env);
163#if defined(__GLIBC__) && defined(__GLIBC_MINOR__) \
164 && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined(JB_PC) && defined(JB_SP)
165 ctx->env[0].__jmpbuf[JB_PC] = (int)coro_init; 326 ctx->env[JB_PC] = (__uint64_t)coro_init;
166 ctx->env[0].__jmpbuf[JB_SP] = (int)((char *)sptr + ssize); 327 ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
167#elif defined(__GLIBC__) && defined(__GLIBC_MINOR__) \ 328
168 && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined(__mc68000__) 329# elif CORO_ASM
169 ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init; 330
170 ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize); 331 ctx->sp = (volatile void **)(ssize + (char *)sptr);
171#elif defined(__GNU_LIBRARY__) && defined(__i386__) 332 ctx->sp -= NUM_ALIGN;
172 ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init; 333 *--ctx->sp = (void *)coro_init;
173 ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize); 334 ctx->sp -= NUM_SAVED;
335
336# endif
337
338 coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro);
339
340# elif CORO_PTHREAD
341
342 pthread_t id;
343 pthread_attr_t attr;
344 coro_context nctx;
345 struct coro_init_args args;
346 static int once;
347
348 if (!once)
349 {
350 pthread_mutex_lock (&coro_mutex);
351 once = 1;
352 }
353
354 args.func = coro;
355 args.arg = arg;
356 args.self = ctx;
357 args.main = &nctx;
358
359 pthread_attr_init (&attr);
360 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
361 pthread_attr_setstack (&attr, sptr, (size_t)ssize);
362 pthread_create (&id, &attr, trampoline, &args);
363
364 pthread_cond_init (&args.self->c, 0);
365 coro_transfer (args.main, args.self);
366
174#else 367#else
175#error "Unsupported Linux (g)libc version and/or platform" 368# error unsupported backend
176#endif
177
178# endif 369#endif
179
180 coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro);
181
182#else
183error unsupported architecture
184#endif
185} 370}
186 371

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