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/cvs/cvsroot/libcoro/coro.c
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Comparing cvsroot/libcoro/coro.c (file contents):
Revision 1.14 by root, Mon Mar 21 14:17:44 2005 UTC vs.
Revision 1.27 by root, Wed May 2 05:53:26 2007 UTC

1/* 1/*
2 * Copyright (c) 2001-2005 Marc Alexander Lehmann <schmorp@schmorp.de> 2 * Copyright (c) 2001-2006 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,
… …
38# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8) 38# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8)
39# define STACK_ADJUST_SIZE(sp,ss) ((ss) - 8) 39# define STACK_ADJUST_SIZE(sp,ss) ((ss) - 8)
40# elif __i386__ && CORO_LINUX 40# elif __i386__ && CORO_LINUX
41# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss)) 41# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss))
42# define STACK_ADJUST_SIZE(sp,ss) (ss) 42# define STACK_ADJUST_SIZE(sp,ss) (ss)
43# elif __amd64__ && CORO_LINUX
44# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8)
45# define STACK_ADJUST_SIZE(sp,ss) (ss)
43# else 46# else
44# define STACK_ADJUST_PTR(sp,ss) (sp) 47# define STACK_ADJUST_PTR(sp,ss) (sp)
45# define STACK_ADJUST_SIZE(sp,ss) (ss) 48# define STACK_ADJUST_SIZE(sp,ss) (ss)
46# endif 49# endif
47#endif 50#endif
48 51
52#if CORO_UCONTEXT
53# include <stddef.h>
54#endif
55
49#if CORO_SJLJ || CORO_LOOSE || CORO_LINUX || CORO_IRIX 56#if CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM
57
58#include <stdlib.h>
50 59
51#if CORO_SJLJ 60#if CORO_SJLJ
61# include <stdio.h>
52# include <signal.h> 62# include <signal.h>
63# include <unistd.h>
53#endif 64#endif
54 65
55static volatile coro_func coro_init_func; 66static volatile coro_func coro_init_func;
56static volatile void *coro_init_arg; 67static volatile void *coro_init_arg;
57static volatile coro_context *new_coro, *create_coro; 68static volatile coro_context *new_coro, *create_coro;
58 69
70/* 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 */
72#if __GNUC__ >= 3 && __ELF__
73# define HAVE_CFI 1
74#endif
75
59static void 76static void
60coro_init (void) 77coro_init (void)
61{ 78{
62 volatile coro_func func = coro_init_func; 79 volatile coro_func func = coro_init_func;
63 volatile void *arg = coro_init_arg; 80 volatile void *arg = coro_init_arg;
… …
77/* trampoline signal handler */ 94/* trampoline signal handler */
78static void 95static void
79trampoline (int sig) 96trampoline (int sig)
80{ 97{
81 if (setjmp (((coro_context *)new_coro)->env)) 98 if (setjmp (((coro_context *)new_coro)->env))
99 {
100#if HAVE_CFI
101 asm (".cfi_startproc");
102#endif
82 coro_init (); /* start it */ 103 coro_init (); /* start it */
104#if HAVE_CFI
105 asm (".cfi_endproc");
106#endif
107 }
83 else 108 else
84 trampoline_count++; 109 trampoline_count++;
85} 110}
86 111
87# endif 112# endif
88 113
89#endif 114#endif
90 115
116#if CORO_ASM
117void __attribute__((__noinline__, __fastcall__))
118coro_transfer (struct coro_context *prev, struct coro_context *next)
119{
120 asm volatile (
121#if __amd64
122# define NUM_CLOBBERED 5
123 "push %%rbx\n\t"
124 "push %%r12\n\t"
125 "push %%r13\n\t"
126 "push %%r14\n\t"
127 "push %%r15\n\t"
128 "mov %%rsp, %0\n\t"
129 "mov %1, %%rsp\n\t"
130 "pop %%r15\n\t"
131 "pop %%r14\n\t"
132 "pop %%r13\n\t"
133 "pop %%r12\n\t"
134 "pop %%rbx\n\t"
135#elif __i386
136# define NUM_CLOBBERED 4
137 "push %%ebx\n\t"
138 "push %%esi\n\t"
139 "push %%edi\n\t"
140 "push %%ebp\n\t"
141 "mov %%esp, %0\n\t"
142 "mov %1, %%esp\n\t"
143 "pop %%ebp\n\t"
144 "pop %%edi\n\t"
145 "pop %%esi\n\t"
146 "pop %%ebx\n\t"
147#else
148# error unsupported architecture
149#endif
150 : "=m" (prev->sp)
151 : "m" (next->sp)
152 );
153}
154#endif
155
91/* initialize a machine state */ 156/* initialize a machine state */
92void coro_create(coro_context *ctx, 157void coro_create (coro_context *ctx,
93 coro_func coro, void *arg, 158 coro_func coro, void *arg,
94 void *sptr, long ssize) 159 void *sptr, long ssize)
95{ 160{
96#if CORO_UCONTEXT 161#if CORO_UCONTEXT
97 162
98 getcontext (&(ctx->uc)); 163 getcontext (&(ctx->uc));
99 164
… …
102 ctx->uc.uc_stack.ss_size = (size_t) STACK_ADJUST_SIZE (sptr,ssize); 167 ctx->uc.uc_stack.ss_size = (size_t) STACK_ADJUST_SIZE (sptr,ssize);
103 ctx->uc.uc_stack.ss_flags = 0; 168 ctx->uc.uc_stack.ss_flags = 0;
104 169
105 makecontext (&(ctx->uc), (void (*)()) coro, 1, arg); 170 makecontext (&(ctx->uc), (void (*)()) coro, 1, arg);
106 171
107#elif CORO_SJLJ || CORO_LOOSE || CORO_LINUX || CORO_IRIX 172#elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM
108 173
109# if CORO_SJLJ 174# if CORO_SJLJ
110 stack_t ostk, nstk; 175 stack_t ostk, nstk;
111 struct sigaction osa, nsa; 176 struct sigaction osa, nsa;
112 sigset_t nsig, osig; 177 sigset_t nsig, osig;
… …
129 nsa.sa_handler = trampoline; 194 nsa.sa_handler = trampoline;
130 sigemptyset (&nsa.sa_mask); 195 sigemptyset (&nsa.sa_mask);
131 nsa.sa_flags = SA_ONSTACK; 196 nsa.sa_flags = SA_ONSTACK;
132 197
133 if (sigaction (SIGUSR2, &nsa, &osa)) 198 if (sigaction (SIGUSR2, &nsa, &osa))
199 {
134 perror ("sigaction"); 200 perror ("sigaction");
201 abort ();
202 }
135 203
136 /* set the new stack */ 204 /* set the new stack */
137 nstk.ss_sp = STACK_ADJUST_PTR (sptr,ssize); /* yes, some platforms (IRIX) get this wrong. */ 205 nstk.ss_sp = STACK_ADJUST_PTR (sptr,ssize); /* yes, some platforms (IRIX) get this wrong. */
138 nstk.ss_size = STACK_ADJUST_SIZE (sptr,ssize); 206 nstk.ss_size = STACK_ADJUST_SIZE (sptr,ssize);
139 nstk.ss_flags = 0; 207 nstk.ss_flags = 0;
140 208
141 if (sigaltstack (&nstk, &ostk) < 0) 209 if (sigaltstack (&nstk, &ostk) < 0)
210 {
142 perror ("sigaltstack"); 211 perror ("sigaltstack");
212 abort ();
213 }
143 214
144 trampoline_count = 0; 215 trampoline_count = 0;
145 kill (getpid (), SIGUSR2); 216 kill (getpid (), SIGUSR2);
146 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2); 217 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2);
147 218
… …
158 abort (); 229 abort ();
159 230
160 if (~ostk.ss_flags & SS_DISABLE) 231 if (~ostk.ss_flags & SS_DISABLE)
161 sigaltstack (&ostk, 0); 232 sigaltstack (&ostk, 0);
162 233
163 sigaction (SIGUSR1, &osa, 0); 234 sigaction (SIGUSR2, &osa, 0);
164 235
165 sigprocmask (SIG_SETMASK, &osig, 0); 236 sigprocmask (SIG_SETMASK, &osig, 0);
166 237
167# elif CORO_LOOSE 238# elif CORO_LOSER
168 239
169 setjmp (ctx->env); 240 setjmp (ctx->env);
241#if __CYGWIN__
170 ctx->env[7] = (long)((char *)sptr + ssize); 242 ctx->env[7] = (long)((char *)sptr + ssize);
171 ctx->env[8] = (long)coro_init; 243 ctx->env[8] = (long)coro_init;
244#elif defined(_M_IX86)
245 ((_JUMP_BUFFER *)&ctx->env)->Eip = (long)coro_init;
246 ((_JUMP_BUFFER *)&ctx->env)->Esp = (long)STACK_ADJUST_PTR (sptr,ssize);
247#elif defined(_M_AMD64)
248 ((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64)coro_init;
249 ((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64)STACK_ADJUST_PTR (sptr,ssize);
250#elif defined(_M_IA64)
251 ((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64)coro_init;
252 ((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64)STACK_ADJUST_PTR (sptr,ssize);
253#else
254#error "microsoft libc or architecture not supported"
255#endif
172 256
173# elif CORO_LINUX 257# elif CORO_LINUX
174 258
175 setjmp (ctx->env); 259 _setjmp (ctx->env);
176#if defined(__GLIBC__) && defined(__GLIBC_MINOR__) \
177 && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined(JB_PC) && defined(JB_SP) 260#if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP)
178 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init; 261 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
179 ctx->env[0].__jmpbuf[JB_SP] = (long)STACK_ADJUST_PTR (sptr,ssize); 262 ctx->env[0].__jmpbuf[JB_SP] = (long)STACK_ADJUST_PTR (sptr, ssize);
180#elif defined(__GLIBC__) && defined(__GLIBC_MINOR__) \
181 && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined(__mc68000__) 263#elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__)
182 ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init; 264 ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init;
183 ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize); 265 ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize);
184#elif defined(__GNU_LIBRARY__) && defined(__i386__) 266#elif defined (__GNU_LIBRARY__) && defined (__i386__)
185 ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init; 267 ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init;
186 ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize); 268 ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize);
187#elif defined(__GNU_LIBRARY__) && defined(__amd64__) 269#elif defined (__GNU_LIBRARY__) && defined (__amd64__)
188 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init; 270 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
189 ctx->env[0].__jmpbuf[JB_RSP] = (long)((char *)sptr + ssize); 271 ctx->env[0].__jmpbuf[JB_RSP] = (long)STACK_ADJUST_PTR (sptr, ssize);
190#else 272#else
191#error "linux libc or architecture not supported" 273# error "linux libc or architecture not supported"
192#endif 274#endif
193 275
194# elif CORO_IRIX 276# elif CORO_IRIX
195 277
196 setjmp (ctx->env); 278 setjmp (ctx->env);
197 ctx->env[JB_PC] = (__uint64_t)coro_init; 279 ctx->env[JB_PC] = (__uint64_t)coro_init;
198 ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr,ssize); 280 ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize);
281
282# elif CORO_ASM
283
284 ctx->sp = (volatile void **)(ssize + (char *)sptr);
285 *--ctx->sp = (void *)coro_init;
286 *--ctx->sp = (void *)coro_init; // this is needed when the prologue saves ebp
287 ctx->sp -= NUM_CLOBBERED;
199 288
200# endif 289# endif
201 290
202 coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro); 291 coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro);
203 292
204#else 293#else
205error unsupported architecture 294# error unsupported architecture
206#endif 295#endif
207} 296}
208 297

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