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Comparing libcoro/coro.c (file contents):
Revision 1.8 by root, Sun Sep 16 01:34:36 2001 UTC vs.
Revision 1.29 by root, Sun Mar 2 16:10:22 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
… …
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
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)
51# elif __amd64__ && CORO_LINUX
52# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8)
53# define STACK_ADJUST_SIZE(sp,ss) (ss)
43# else 54# else
44# define STACK_ADJUST_PTR(sp,ss) (sp) 55# define STACK_ADJUST_PTR(sp,ss) (sp)
45# define STACK_ADJUST_SIZE(sp,ss) (ss) 56# define STACK_ADJUST_SIZE(sp,ss) (ss)
46# endif 57# endif
47#endif 58#endif
48 59
60#if CORO_UCONTEXT
61# include <stddef.h>
62#endif
63
49#if CORO_SJLJ || CORO_LOOSE || CORO_LINUX || CORO_IRIX 64#if CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM
50 65
66#include <stdlib.h>
67
68#if CORO_SJLJ
69# include <stdio.h>
51#include <signal.h> 70# include <signal.h>
71# include <unistd.h>
72#endif
52 73
53static volatile coro_func coro_init_func; 74static volatile coro_func coro_init_func;
54static volatile void *coro_init_arg; 75static volatile void *coro_init_arg;
55static volatile coro_context *new_coro, *create_coro; 76static volatile coro_context *new_coro, *create_coro;
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
56 83
57static void 84static void
58coro_init (void) 85coro_init (void)
59{ 86{
60 volatile coro_func func = coro_init_func; 87 volatile coro_func func = coro_init_func;
… …
72 99
73static volatile int trampoline_count; 100static volatile int trampoline_count;
74 101
75/* trampoline signal handler */ 102/* trampoline signal handler */
76static void 103static void
77trampoline(int sig) 104trampoline (int sig)
78{ 105{
79 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
80 coro_init (); /* start it */ 111 coro_init (); /* start it */
112#if HAVE_CFI
113 asm (".cfi_endproc");
114#endif
115 }
81 else 116 else
82 trampoline_count++; 117 trampoline_count++;
83} 118}
84 119
85# endif 120# endif
86 121
87#endif 122#endif
88 123
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
89/* initialize a machine state */ 164/* initialize a machine state */
90void coro_create(coro_context *ctx, 165void coro_create (coro_context *ctx,
91 coro_func coro, void *arg, 166 coro_func coro, void *arg,
92 void *sptr, long ssize) 167 void *sptr, long ssize)
93{ 168{
94#if CORO_UCONTEXT 169#if CORO_UCONTEXT
95 170
96 getcontext (&(ctx->uc)); 171 getcontext (&(ctx->uc));
97 172
98 ctx->uc.uc_link = 0; 173 ctx->uc.uc_link = 0;
99 ctx->uc.uc_stack.ss_sp = STACK_ADJUST_PTR(sptr,ssize); 174 ctx->uc.uc_stack.ss_sp = STACK_ADJUST_PTR (sptr,ssize);
100 ctx->uc.uc_stack.ss_size = (size_t) STACK_ADJUST_SIZE (sptr,ssize); 175 ctx->uc.uc_stack.ss_size = (size_t) STACK_ADJUST_SIZE (sptr,ssize);
101 ctx->uc.uc_stack.ss_flags = 0; 176 ctx->uc.uc_stack.ss_flags = 0;
102 177
103 makecontext (&(ctx->uc), (void (*)()) coro, 1, arg); 178 makecontext (&(ctx->uc), (void (*)()) coro, 1, arg);
104 179
105#elif CORO_SJLJ || CORO_LOOSE || CORO_LINUX || CORO_IRIX 180#elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM
106 181
107# if CORO_SJLJ 182# if CORO_SJLJ
108 stack_t ostk, nstk; 183 stack_t ostk, nstk;
109 struct sigaction osa, nsa; 184 struct sigaction osa, nsa;
110 sigset_t nsig, osig; 185 sigset_t nsig, osig;
… …
127 nsa.sa_handler = trampoline; 202 nsa.sa_handler = trampoline;
128 sigemptyset (&nsa.sa_mask); 203 sigemptyset (&nsa.sa_mask);
129 nsa.sa_flags = SA_ONSTACK; 204 nsa.sa_flags = SA_ONSTACK;
130 205
131 if (sigaction (SIGUSR2, &nsa, &osa)) 206 if (sigaction (SIGUSR2, &nsa, &osa))
207 {
132 perror ("sigaction"); 208 perror ("sigaction");
209 abort ();
210 }
133 211
134 /* set the new stack */ 212 /* set the new stack */
135 nstk.ss_sp = STACK_ADJUST(sptr,ssize); /* yes, some platforms (IRIX) get this wrong. */ 213 nstk.ss_sp = STACK_ADJUST_PTR (sptr,ssize); /* yes, some platforms (IRIX) get this wrong. */
136 nstk.ss_size = STACK_ADJUST_SIZE (sptr,ssize); 214 nstk.ss_size = STACK_ADJUST_SIZE (sptr,ssize);
137 nstk.ss_flags = 0; 215 nstk.ss_flags = 0;
138 216
139 if (sigaltstack (&nstk, &ostk) < 0) 217 if (sigaltstack (&nstk, &ostk) < 0)
218 {
140 perror ("sigaltstack"); 219 perror ("sigaltstack");
220 abort ();
221 }
141 222
142 trampoline_count = 0; 223 trampoline_count = 0;
143 kill (getpid (), SIGUSR2); 224 kill (getpid (), SIGUSR2);
144 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2); 225 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2);
145 226
… …
156 abort (); 237 abort ();
157 238
158 if (~ostk.ss_flags & SS_DISABLE) 239 if (~ostk.ss_flags & SS_DISABLE)
159 sigaltstack (&ostk, 0); 240 sigaltstack (&ostk, 0);
160 241
161 sigaction (SIGUSR1, &osa, 0); 242 sigaction (SIGUSR2, &osa, 0);
162 243
163 sigprocmask (SIG_SETMASK, &osig, 0); 244 sigprocmask (SIG_SETMASK, &osig, 0);
164 245
165# elif CORO_LOOSE 246# elif CORO_LOSER
166 247
167 setjmp (ctx->env); 248 setjmp (ctx->env);
249#if __CYGWIN__
168 ctx->env[7] = (int)((char *)sptr + ssize); 250 ctx->env[7] = (long)((char *)sptr + ssize);
169 ctx->env[8] = (int)coro_init; 251 ctx->env[8] = (long)coro_init;
252#elif defined(_M_IX86)
253 ((_JUMP_BUFFER *)&ctx->env)->Eip = (long)coro_init;
254 ((_JUMP_BUFFER *)&ctx->env)->Esp = (long)STACK_ADJUST_PTR (sptr,ssize);
255#elif defined(_M_AMD64)
256 ((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64)coro_init;
257 ((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64)STACK_ADJUST_PTR (sptr,ssize);
258#elif defined(_M_IA64)
259 ((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64)coro_init;
260 ((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64)STACK_ADJUST_PTR (sptr,ssize);
261#else
262#error "microsoft libc or architecture not supported"
263#endif
170 264
171# elif CORO_LINUX 265# elif CORO_LINUX
172 266
173 setjmp (ctx->env); 267 _setjmp (ctx->env);
174#if defined(__GLIBC__) && defined(__GLIBC_MINOR__) \
175 && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined(JB_PC) && defined(JB_SP) 268#if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP)
176 ctx->env[0].__jmpbuf[JB_PC] = (int)coro_init; 269 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
177 ctx->env[0].__jmpbuf[JB_SP] = (int)STACK_ADJUST_PTR(sptr,ssize); 270 ctx->env[0].__jmpbuf[JB_SP] = (long)STACK_ADJUST_PTR (sptr, ssize);
178#elif defined(__GLIBC__) && defined(__GLIBC_MINOR__) \
179 && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined(__mc68000__) 271#elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__)
180 ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init; 272 ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init;
181 ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize); 273 ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize);
182#elif defined(__GNU_LIBRARY__) && defined(__i386__) 274#elif defined (__GNU_LIBRARY__) && defined (__i386__)
183 ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init; 275 ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init;
184 ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize); 276 ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize);
277#elif defined (__GNU_LIBRARY__) && defined (__amd64__)
278 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
279 ctx->env[0].__jmpbuf[JB_RSP] = (long)STACK_ADJUST_PTR (sptr, ssize);
185#else 280#else
186#error "linux libc or architecture not supported" 281# error "linux libc or architecture not supported"
187#endif 282#endif
188 283
189# elif CORO_IRIX 284# elif CORO_IRIX
190 285
191 setjmp (ctx->env); 286 setjmp (ctx->env);
192 ctx->env[JB_PC] = (__uint64_t)coro_init; 287 ctx->env[JB_PC] = (__uint64_t)coro_init;
193 ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR(sptr,ssize); 288 ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize);
289
290# elif CORO_ASM
291
292 ctx->sp = (volatile void **)(ssize + (char *)sptr);
293 *--ctx->sp = (void *)coro_init;
294 *--ctx->sp = (void *)coro_init; // this is needed when the prologue saves ebp
295 ctx->sp -= NUM_CLOBBERED;
194 296
195# endif 297# endif
196 298
197 coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro); 299 coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro);
198 300
199#else 301#else
200error unsupported architecture 302# error unsupported architecture
201#endif 303#endif
202} 304}
203 305

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