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Comparing libcoro/coro.c (file contents):
Revision 1.1 by root, Mon Jul 23 17:13:08 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,
… …
30 * go to Ralf S. Engelschall <rse@engelschall.com>. 30 * go to Ralf S. Engelschall <rse@engelschall.com>.
31 */ 31 */
32 32
33#include "coro.h" 33#include "coro.h"
34 34
35#if CORO_LOOSE || CORO_SJLJ 35#if !defined(STACK_ADJUST_PTR)
36/* IRIX is decidedly NON-unix */
37# if __sgi
38# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8)
39# define STACK_ADJUST_SIZE(sp,ss) ((ss) - 8)
40# elif __i386__ && CORO_LINUX
41# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (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)
46# else
47# define STACK_ADJUST_PTR(sp,ss) (sp)
48# define STACK_ADJUST_SIZE(sp,ss) (ss)
49# endif
50#endif
36 51
52#if CORO_UCONTEXT
53# include <stddef.h>
54#endif
55
56#if CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM
57
58#include <stdlib.h>
59
60#if CORO_SJLJ
61# include <stdio.h>
37#include <signal.h> 62# include <signal.h>
63# include <unistd.h>
64#endif
38 65
39static volatile coro_func coro_init_func; 66static volatile coro_func coro_init_func;
40static volatile void *coro_init_arg; 67static volatile void *coro_init_arg;
41static volatile coro_context *new_coro, *create_coro; 68static volatile coro_context *new_coro, *create_coro;
42 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
43static void 76static void
44coro_init (void) 77coro_init (void)
45{ 78{
46 volatile coro_func func = coro_init_func; 79 volatile coro_func func = coro_init_func;
47 volatile void *arg = coro_init_arg; 80 volatile void *arg = coro_init_arg;
48 81
49 coro_transfer (new_coro, create_coro); 82 coro_transfer ((coro_context *)new_coro, (coro_context *)create_coro);
50 83
51 func (arg); 84 func ((void *)arg);
52 85
53 /* the new coro returned. bad. just abort() for now */ 86 /* the new coro returned. bad. just abort() for now */
54 abort (); 87 abort ();
55} 88}
56 89
57# if CORO_SJLJ 90# if CORO_SJLJ
58# define coro_save(ctx) (void)setjmp((ctx)->env)
59 91
60static volatile int trampoline_count; 92static volatile int trampoline_count;
61 93
62/* trampoline signal handler */ 94/* trampoline signal handler */
63static void 95static void
64trampoline(int sig) 96trampoline (int sig)
65{ 97{
66 if (setjmp (&(new_coro->env))) 98 if (setjmp (((coro_context *)new_coro)->env))
99 {
100#if HAVE_CFI
101 asm (".cfi_startproc");
102#endif
67 coro_init (); /* start it */ 103 coro_init (); /* start it */
104#if HAVE_CFI
105 asm (".cfi_endproc");
106#endif
107 }
68 else 108 else
69 trampoline_count++; 109 trampoline_count++;
70} 110}
71 111
72# endif 112# endif
73 113
74#elif CORO_UCONTEXT 114#endif
75# define coro_save(ctx) getcontext(&((ctx)->uc)) 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}
76#endif 154#endif
77 155
78/* initialize a machine state */ 156/* initialize a machine state */
79void coro_create(coro_context *ctx, 157void coro_create (coro_context *ctx,
80 coro_func coro, void *arg, 158 coro_func coro, void *arg,
81 void *sptr, long ssize) 159 void *sptr, long ssize)
82{ 160{
83#if CORO_UCONTEXT 161#if CORO_UCONTEXT
84 162
85 getcontext (&(ctx->uc)); 163 getcontext (&(ctx->uc));
86 164
87 ctx->uc.uc_link = 0; 165 ctx->uc.uc_link = 0;
88 ctx->uc.uc_stack.ss_sp = sptr; 166 ctx->uc.uc_stack.ss_sp = STACK_ADJUST_PTR (sptr,ssize);
89 ctx->uc.uc_stack.ss_size = (size_t) ssize; 167 ctx->uc.uc_stack.ss_size = (size_t) STACK_ADJUST_SIZE (sptr,ssize);
90 ctx->uc.uc_stack.ss_flags = 0; 168 ctx->uc.uc_stack.ss_flags = 0;
91 169
92 makecontext (&(ctx->uc), (void (*)()) coro, 1, arg); 170 makecontext (&(ctx->uc), (void (*)()) coro, 1, arg);
93 171
94#elif CORO_SJLJ || CORO_LOOSE 172#elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM
95 173
96# if CORO_SJLJ 174# if CORO_SJLJ
97 stack_t ostk, nstk; 175 stack_t ostk, nstk;
98 struct sigaction osa, nsa; 176 struct sigaction osa, nsa;
99 sigset_t nsig, osig; 177 sigset_t nsig, osig;
… …
116 nsa.sa_handler = trampoline; 194 nsa.sa_handler = trampoline;
117 sigemptyset (&nsa.sa_mask); 195 sigemptyset (&nsa.sa_mask);
118 nsa.sa_flags = SA_ONSTACK; 196 nsa.sa_flags = SA_ONSTACK;
119 197
120 if (sigaction (SIGUSR2, &nsa, &osa)) 198 if (sigaction (SIGUSR2, &nsa, &osa))
199 {
121 perror ("sigaction"); 200 perror ("sigaction");
201 abort ();
202 }
122 203
123 /* set the new stack */ 204 /* set the new stack */
124 nstk.ss_sp = sptr; 205 nstk.ss_sp = STACK_ADJUST_PTR (sptr,ssize); /* yes, some platforms (IRIX) get this wrong. */
125 nstk.ss_size = ssize; 206 nstk.ss_size = STACK_ADJUST_SIZE (sptr,ssize);
126 nstk.ss_flags = 0; 207 nstk.ss_flags = 0;
127 208
128 if (sigaltstack (&nstk, &ostk) < 0) 209 if (sigaltstack (&nstk, &ostk) < 0)
210 {
129 perror ("sigaltstack"); 211 perror ("sigaltstack");
212 abort ();
213 }
130 214
131 trampoline_count = 0; 215 trampoline_count = 0;
132 kill (getpid (), SIGUSR2); 216 kill (getpid (), SIGUSR2);
133 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2); 217 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2);
134 218
… …
145 abort (); 229 abort ();
146 230
147 if (~ostk.ss_flags & SS_DISABLE) 231 if (~ostk.ss_flags & SS_DISABLE)
148 sigaltstack (&ostk, 0); 232 sigaltstack (&ostk, 0);
149 233
150 sigaction (SIGUSR1, &osa, 0); 234 sigaction (SIGUSR2, &osa, 0);
151 235
152 sigprocmask (SIG_SETMASK, &osig, 0); 236 sigprocmask (SIG_SETMASK, &osig, 0);
153 237
154# elif MS_LOOSE 238# elif CORO_LOSER
155 239
156 coro_save (ctx); 240 setjmp (ctx->env);
241#if __CYGWIN__
157 ctx->env[7] = (int)((char *)sptr + ssize); 242 ctx->env[7] = (long)((char *)sptr + ssize);
158 ctx->env[8] = (int)coro; 243 ctx->env[8] = (long)coro_init;
159 244#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"
160# endif 255#endif
161 256
162 coro_transfer (create_coro, new_coro); 257# elif CORO_LINUX
163 258
259 _setjmp (ctx->env);
260#if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP)
261 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
262 ctx->env[0].__jmpbuf[JB_SP] = (long)STACK_ADJUST_PTR (sptr, ssize);
263#elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__)
264 ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init;
265 ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize);
266#elif defined (__GNU_LIBRARY__) && defined (__i386__)
267 ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init;
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);
164#else 272#else
273# error "linux libc or architecture not supported"
274#endif
275
276# elif CORO_IRIX
277
278 setjmp (ctx->env);
279 ctx->env[JB_PC] = (__uint64_t)coro_init;
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;
288
289# endif
290
291 coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro);
292
293#else
165error unsupported architecture 294# error unsupported architecture
166#endif 295#endif
167} 296}
168 297

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