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Comparing libcoro/coro.c (file contents):
Revision 1.25 by root, Fri Apr 27 19:26:18 2007 UTC vs.
Revision 1.29 by root, Sun Mar 2 16:10:22 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
… …
51 59
52#if CORO_UCONTEXT 60#if CORO_UCONTEXT
53# include <stddef.h> 61# include <stddef.h>
54#endif 62#endif
55 63
56#if CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX 64#if CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM
57 65
58#include <stdlib.h> 66#include <stdlib.h>
59 67
60#if CORO_SJLJ 68#if CORO_SJLJ
61# include <stdio.h> 69# include <stdio.h>
… …
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)
… …
79 volatile coro_func func = coro_init_func; 87 volatile coro_func func = coro_init_func;
80 volatile void *arg = coro_init_arg; 88 volatile void *arg = coro_init_arg;
81 89
82 coro_transfer ((coro_context *)new_coro, (coro_context *)create_coro); 90 coro_transfer ((coro_context *)new_coro, (coro_context *)create_coro);
83 91
84#if HAVE_CFI
85 asm (".cfi_startproc");
86#endif
87 func ((void *)arg); 92 func ((void *)arg);
88#if HAVE_CFI
89 asm (".cfi_endproc");
90#endif
91 93
92 /* the new coro returned. bad. just abort() for now */ 94 /* the new coro returned. bad. just abort() for now */
93 abort (); 95 abort ();
94} 96}
95 97
… …
100/* trampoline signal handler */ 102/* trampoline signal handler */
101static void 103static void
102trampoline (int sig) 104trampoline (int sig)
103{ 105{
104 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
105 coro_init (); /* start it */ 111 coro_init (); /* start it */
112#if HAVE_CFI
113 asm (".cfi_endproc");
114#endif
115 }
106 else 116 else
107 trampoline_count++; 117 trampoline_count++;
108} 118}
109 119
110# endif 120# endif
111 121
122#endif
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}
112#endif 162#endif
113 163
114/* initialize a machine state */ 164/* initialize a machine state */
115void coro_create (coro_context *ctx, 165void coro_create (coro_context *ctx,
116 coro_func coro, void *arg, 166 coro_func coro, void *arg,
… …
125 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);
126 ctx->uc.uc_stack.ss_flags = 0; 176 ctx->uc.uc_stack.ss_flags = 0;
127 177
128 makecontext (&(ctx->uc), (void (*)()) coro, 1, arg); 178 makecontext (&(ctx->uc), (void (*)()) coro, 1, arg);
129 179
130#elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX 180#elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM
131 181
132# if CORO_SJLJ 182# if CORO_SJLJ
133 stack_t ostk, nstk; 183 stack_t ostk, nstk;
134 struct sigaction osa, nsa; 184 struct sigaction osa, nsa;
135 sigset_t nsig, osig; 185 sigset_t nsig, osig;
… …
226 ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize); 276 ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize);
227#elif defined (__GNU_LIBRARY__) && defined (__amd64__) 277#elif defined (__GNU_LIBRARY__) && defined (__amd64__)
228 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init; 278 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
229 ctx->env[0].__jmpbuf[JB_RSP] = (long)STACK_ADJUST_PTR (sptr, ssize); 279 ctx->env[0].__jmpbuf[JB_RSP] = (long)STACK_ADJUST_PTR (sptr, ssize);
230#else 280#else
231#error "linux libc or architecture not supported" 281# error "linux libc or architecture not supported"
232#endif 282#endif
233 283
234# elif CORO_IRIX 284# elif CORO_IRIX
235 285
236 setjmp (ctx->env); 286 setjmp (ctx->env);
237 ctx->env[JB_PC] = (__uint64_t)coro_init; 287 ctx->env[JB_PC] = (__uint64_t)coro_init;
238 ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize); 288 ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize);
239 289
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;
296
240# endif 297# endif
241 298
242 coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro); 299 coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro);
243 300
244#else 301#else
245error unsupported architecture 302# error unsupported architecture
246#endif 303#endif
247} 304}
248 305

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