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Comparing libcoro/coro.c (file contents):
Revision 1.9 by root, Tue Nov 6 20:34:11 2001 UTC vs.
Revision 1.27 by root, Wed May 2 05:53:26 2007 UTC

1/* 1/*
2 * Copyright (c) 2001 Marc Alexander Lehmann <pcg@goof.com> 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
50 57
58#include <stdlib.h>
59
60#if CORO_SJLJ
61# include <stdio.h>
51#include <signal.h> 62# include <signal.h>
63# include <unistd.h>
64#endif
52 65
53static volatile coro_func coro_init_func; 66static volatile coro_func coro_init_func;
54static volatile void *coro_init_arg; 67static volatile void *coro_init_arg;
55static volatile coro_context *new_coro, *create_coro; 68static volatile coro_context *new_coro, *create_coro;
56 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
57static void 76static void
58coro_init (void) 77coro_init (void)
59{ 78{
60 volatile coro_func func = coro_init_func; 79 volatile coro_func func = coro_init_func;
61 volatile void *arg = coro_init_arg; 80 volatile void *arg = coro_init_arg;
… …
72 91
73static volatile int trampoline_count; 92static volatile int trampoline_count;
74 93
75/* trampoline signal handler */ 94/* trampoline signal handler */
76static void 95static void
77trampoline(int sig) 96trampoline (int sig)
78{ 97{
79 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
80 coro_init (); /* start it */ 103 coro_init (); /* start it */
104#if HAVE_CFI
105 asm (".cfi_endproc");
106#endif
107 }
81 else 108 else
82 trampoline_count++; 109 trampoline_count++;
83} 110}
84 111
85# endif 112# endif
86 113
87#endif 114#endif
88 115
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
89/* initialize a machine state */ 156/* initialize a machine state */
90void coro_create(coro_context *ctx, 157void coro_create (coro_context *ctx,
91 coro_func coro, void *arg, 158 coro_func coro, void *arg,
92 void *sptr, long ssize) 159 void *sptr, long ssize)
93{ 160{
94#if CORO_UCONTEXT 161#if CORO_UCONTEXT
95 162
96 getcontext (&(ctx->uc)); 163 getcontext (&(ctx->uc));
97 164
… …
100 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);
101 ctx->uc.uc_stack.ss_flags = 0; 168 ctx->uc.uc_stack.ss_flags = 0;
102 169
103 makecontext (&(ctx->uc), (void (*)()) coro, 1, arg); 170 makecontext (&(ctx->uc), (void (*)()) coro, 1, arg);
104 171
105#elif CORO_SJLJ || CORO_LOOSE || CORO_LINUX || CORO_IRIX 172#elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM
106 173
107# if CORO_SJLJ 174# if CORO_SJLJ
108 stack_t ostk, nstk; 175 stack_t ostk, nstk;
109 struct sigaction osa, nsa; 176 struct sigaction osa, nsa;
110 sigset_t nsig, osig; 177 sigset_t nsig, osig;
… …
127 nsa.sa_handler = trampoline; 194 nsa.sa_handler = trampoline;
128 sigemptyset (&nsa.sa_mask); 195 sigemptyset (&nsa.sa_mask);
129 nsa.sa_flags = SA_ONSTACK; 196 nsa.sa_flags = SA_ONSTACK;
130 197
131 if (sigaction (SIGUSR2, &nsa, &osa)) 198 if (sigaction (SIGUSR2, &nsa, &osa))
199 {
132 perror ("sigaction"); 200 perror ("sigaction");
201 abort ();
202 }
133 203
134 /* set the new stack */ 204 /* set the new stack */
135 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. */
136 nstk.ss_size = STACK_ADJUST_SIZE (sptr,ssize); 206 nstk.ss_size = STACK_ADJUST_SIZE (sptr,ssize);
137 nstk.ss_flags = 0; 207 nstk.ss_flags = 0;
138 208
139 if (sigaltstack (&nstk, &ostk) < 0) 209 if (sigaltstack (&nstk, &ostk) < 0)
210 {
140 perror ("sigaltstack"); 211 perror ("sigaltstack");
212 abort ();
213 }
141 214
142 trampoline_count = 0; 215 trampoline_count = 0;
143 kill (getpid (), SIGUSR2); 216 kill (getpid (), SIGUSR2);
144 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2); 217 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2);
145 218
… …
156 abort (); 229 abort ();
157 230
158 if (~ostk.ss_flags & SS_DISABLE) 231 if (~ostk.ss_flags & SS_DISABLE)
159 sigaltstack (&ostk, 0); 232 sigaltstack (&ostk, 0);
160 233
161 sigaction (SIGUSR1, &osa, 0); 234 sigaction (SIGUSR2, &osa, 0);
162 235
163 sigprocmask (SIG_SETMASK, &osig, 0); 236 sigprocmask (SIG_SETMASK, &osig, 0);
164 237
165# elif CORO_LOOSE 238# elif CORO_LOSER
166 239
167 setjmp (ctx->env); 240 setjmp (ctx->env);
241#if __CYGWIN__
168 ctx->env[7] = (int)((char *)sptr + ssize); 242 ctx->env[7] = (long)((char *)sptr + ssize);
169 ctx->env[8] = (int)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
170 256
171# elif CORO_LINUX 257# elif CORO_LINUX
172 258
173 setjmp (ctx->env); 259 _setjmp (ctx->env);
174#if defined(__GLIBC__) && defined(__GLIBC_MINOR__) \
175 && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined(JB_PC) && defined(JB_SP) 260#if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP)
176 ctx->env[0].__jmpbuf[JB_PC] = (int)coro_init; 261 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
177 ctx->env[0].__jmpbuf[JB_SP] = (int)STACK_ADJUST_PTR (sptr,ssize); 262 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__) 263#elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__)
180 ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init; 264 ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init;
181 ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize); 265 ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize);
182#elif defined(__GNU_LIBRARY__) && defined(__i386__) 266#elif defined (__GNU_LIBRARY__) && defined (__i386__)
183 ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init; 267 ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init;
184 ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize); 268 ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize);
269#elif defined (__GNU_LIBRARY__) && defined (__amd64__)
270 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
271 ctx->env[0].__jmpbuf[JB_RSP] = (long)STACK_ADJUST_PTR (sptr, ssize);
185#else 272#else
186#error "linux libc or architecture not supported" 273# error "linux libc or architecture not supported"
187#endif 274#endif
188 275
189# elif CORO_IRIX 276# elif CORO_IRIX
190 277
191 setjmp (ctx->env); 278 setjmp (ctx->env);
192 ctx->env[JB_PC] = (__uint64_t)coro_init; 279 ctx->env[JB_PC] = (__uint64_t)coro_init;
193 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;
194 288
195# endif 289# endif
196 290
197 coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro); 291 coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro);
198 292
199#else 293#else
200error unsupported architecture 294# error unsupported architecture
201#endif 295#endif
202} 296}
203 297

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