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 | * |
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14 | * 3. The name of the author may not be used to endorse or promote products |
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15 | * derived from this software without specific prior written permission. |
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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- |
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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 | * |
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25 | * Alternatively, the contents of this file may be used under the terms of |
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26 | * the GNU General Public License ("GPL") version 2 or any later version, |
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27 | * in which case the provisions of the GPL are applicable instead of |
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28 | * the above. If you wish to allow the use of your version of this file |
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29 | * only under the terms of the GPL and not to allow others to use your |
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30 | * version of this file under the BSD license, indicate your decision |
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31 | * by deleting the provisions above and replace them with the notice |
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32 | * and other provisions required by the GPL. If you do not delete the |
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33 | * provisions above, a recipient may use your version of this file under |
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34 | * either the BSD or the GPL. |
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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 | |
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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> |
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64 | #endif |
72 | #endif |
65 | |
73 | |
66 | static volatile coro_func coro_init_func; |
74 | static volatile coro_func coro_init_func; |
67 | static volatile void *coro_init_arg; |
75 | static volatile void *coro_init_arg; |
68 | static volatile coro_context *new_coro, *create_coro; |
76 | static volatile coro_context *new_coro, *create_coro; |
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77 | |
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78 | /* what we really want to detect here is wether we use a new-enough version of GAS */ |
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79 | /* instead, check for gcc 3, ELF and GNU/Linux and hope for the best */ |
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80 | #if __GNUC__ >= 3 && __ELF__ && __linux__ |
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81 | # define HAVE_CFI 1 |
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82 | #endif |
69 | |
83 | |
70 | static void |
84 | static void |
71 | coro_init (void) |
85 | coro_init (void) |
72 | { |
86 | { |
73 | volatile coro_func func = coro_init_func; |
87 | volatile coro_func func = coro_init_func; |
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88 | /* trampoline signal handler */ |
102 | /* trampoline signal handler */ |
89 | static void |
103 | static void |
90 | trampoline (int sig) |
104 | trampoline (int sig) |
91 | { |
105 | { |
92 | if (setjmp (((coro_context *)new_coro)->env)) |
106 | if (setjmp (((coro_context *)new_coro)->env)) |
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107 | { |
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108 | #if HAVE_CFI |
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109 | asm (".cfi_startproc"); |
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110 | #endif |
93 | coro_init (); /* start it */ |
111 | coro_init (); /* start it */ |
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112 | #if HAVE_CFI |
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113 | asm (".cfi_endproc"); |
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114 | #endif |
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115 | } |
94 | else |
116 | else |
95 | trampoline_count++; |
117 | trampoline_count++; |
96 | } |
118 | } |
97 | |
119 | |
98 | # endif |
120 | # endif |
99 | |
121 | |
100 | #endif |
122 | #endif |
101 | |
123 | |
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124 | #if CORO_ASM |
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125 | void __attribute__((__noinline__, __fastcall__)) |
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126 | coro_transfer (struct coro_context *prev, struct coro_context *next) |
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127 | { |
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128 | asm volatile ( |
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129 | #if __amd64 |
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130 | # define NUM_CLOBBERED 5 |
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131 | "push %%rbx\n\t" |
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132 | "push %%r12\n\t" |
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133 | "push %%r13\n\t" |
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134 | "push %%r14\n\t" |
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135 | "push %%r15\n\t" |
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136 | "mov %%rsp, %0\n\t" |
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137 | "mov %1, %%rsp\n\t" |
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138 | "pop %%r15\n\t" |
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139 | "pop %%r14\n\t" |
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140 | "pop %%r13\n\t" |
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141 | "pop %%r12\n\t" |
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142 | "pop %%rbx\n\t" |
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143 | #elif __i386 |
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144 | # define NUM_CLOBBERED 4 |
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145 | "push %%ebx\n\t" |
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146 | "push %%esi\n\t" |
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147 | "push %%edi\n\t" |
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148 | "push %%ebp\n\t" |
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149 | "mov %%esp, %0\n\t" |
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150 | "mov %1, %%esp\n\t" |
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151 | "pop %%ebp\n\t" |
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152 | "pop %%edi\n\t" |
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153 | "pop %%esi\n\t" |
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154 | "pop %%ebx\n\t" |
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155 | #else |
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156 | # error unsupported architecture |
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157 | #endif |
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158 | : "=m" (prev->sp) |
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159 | : "m" (next->sp) |
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160 | ); |
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161 | } |
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162 | #endif |
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163 | |
102 | /* initialize a machine state */ |
164 | /* initialize a machine state */ |
103 | void coro_create(coro_context *ctx, |
165 | void coro_create (coro_context *ctx, |
104 | coro_func coro, void *arg, |
166 | coro_func coro, void *arg, |
105 | void *sptr, long ssize) |
167 | void *sptr, long ssize) |
106 | { |
168 | { |
107 | #if CORO_UCONTEXT |
169 | #if CORO_UCONTEXT |
108 | |
170 | |
109 | getcontext (&(ctx->uc)); |
171 | getcontext (&(ctx->uc)); |
110 | |
172 | |
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113 | 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); |
114 | ctx->uc.uc_stack.ss_flags = 0; |
176 | ctx->uc.uc_stack.ss_flags = 0; |
115 | |
177 | |
116 | makecontext (&(ctx->uc), (void (*)()) coro, 1, arg); |
178 | makecontext (&(ctx->uc), (void (*)()) coro, 1, arg); |
117 | |
179 | |
118 | #elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX |
180 | #elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM |
119 | |
181 | |
120 | # if CORO_SJLJ |
182 | # if CORO_SJLJ |
121 | stack_t ostk, nstk; |
183 | stack_t ostk, nstk; |
122 | struct sigaction osa, nsa; |
184 | struct sigaction osa, nsa; |
123 | sigset_t nsig, osig; |
185 | sigset_t nsig, osig; |
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140 | nsa.sa_handler = trampoline; |
202 | nsa.sa_handler = trampoline; |
141 | sigemptyset (&nsa.sa_mask); |
203 | sigemptyset (&nsa.sa_mask); |
142 | nsa.sa_flags = SA_ONSTACK; |
204 | nsa.sa_flags = SA_ONSTACK; |
143 | |
205 | |
144 | if (sigaction (SIGUSR2, &nsa, &osa)) |
206 | if (sigaction (SIGUSR2, &nsa, &osa)) |
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207 | { |
145 | perror ("sigaction"); |
208 | perror ("sigaction"); |
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209 | abort (); |
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210 | } |
146 | |
211 | |
147 | /* set the new stack */ |
212 | /* set the new stack */ |
148 | nstk.ss_sp = STACK_ADJUST_PTR (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. */ |
149 | nstk.ss_size = STACK_ADJUST_SIZE (sptr,ssize); |
214 | nstk.ss_size = STACK_ADJUST_SIZE (sptr,ssize); |
150 | nstk.ss_flags = 0; |
215 | nstk.ss_flags = 0; |
151 | |
216 | |
152 | if (sigaltstack (&nstk, &ostk) < 0) |
217 | if (sigaltstack (&nstk, &ostk) < 0) |
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218 | { |
153 | perror ("sigaltstack"); |
219 | perror ("sigaltstack"); |
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220 | abort (); |
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221 | } |
154 | |
222 | |
155 | trampoline_count = 0; |
223 | trampoline_count = 0; |
156 | kill (getpid (), SIGUSR2); |
224 | kill (getpid (), SIGUSR2); |
157 | sigfillset (&nsig); sigdelset (&nsig, SIGUSR2); |
225 | sigfillset (&nsig); sigdelset (&nsig, SIGUSR2); |
158 | |
226 | |
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195 | #endif |
263 | #endif |
196 | |
264 | |
197 | # elif CORO_LINUX |
265 | # elif CORO_LINUX |
198 | |
266 | |
199 | _setjmp (ctx->env); |
267 | _setjmp (ctx->env); |
200 | #if defined(__GLIBC__) && defined(__GLIBC_MINOR__) \ |
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201 | && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined(JB_PC) && defined(JB_SP) |
268 | #if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP) |
202 | ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init; |
269 | ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init; |
203 | ctx->env[0].__jmpbuf[JB_SP] = (long)STACK_ADJUST_PTR (sptr,ssize); |
270 | ctx->env[0].__jmpbuf[JB_SP] = (long)STACK_ADJUST_PTR (sptr, ssize); |
204 | #elif defined(__GLIBC__) && defined(__GLIBC_MINOR__) \ |
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205 | && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined(__mc68000__) |
271 | #elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__) |
206 | ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init; |
272 | ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init; |
207 | ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize); |
273 | ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize); |
208 | #elif defined(__GNU_LIBRARY__) && defined(__i386__) |
274 | #elif defined (__GNU_LIBRARY__) && defined (__i386__) |
209 | ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init; |
275 | ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init; |
210 | ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize); |
276 | ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize); |
211 | #elif defined(__GNU_LIBRARY__) && defined(__amd64__) |
277 | #elif defined (__GNU_LIBRARY__) && defined (__amd64__) |
212 | ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init; |
278 | ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init; |
213 | 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); |
214 | #else |
280 | #else |
215 | #error "linux libc or architecture not supported" |
281 | # error "linux libc or architecture not supported" |
216 | #endif |
282 | #endif |
217 | |
283 | |
218 | # elif CORO_IRIX |
284 | # elif CORO_IRIX |
219 | |
285 | |
220 | setjmp (ctx->env); |
286 | setjmp (ctx->env); |
221 | ctx->env[JB_PC] = (__uint64_t)coro_init; |
287 | ctx->env[JB_PC] = (__uint64_t)coro_init; |
222 | ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr,ssize); |
288 | ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize); |
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289 | |
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290 | # elif CORO_ASM |
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291 | |
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292 | ctx->sp = (volatile void **)(ssize + (char *)sptr); |
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293 | *--ctx->sp = (void *)coro_init; |
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294 | *--ctx->sp = (void *)coro_init; // this is needed when the prologue saves ebp |
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295 | ctx->sp -= NUM_CLOBBERED; |
223 | |
296 | |
224 | # endif |
297 | # endif |
225 | |
298 | |
226 | coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro); |
299 | coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro); |
227 | |
300 | |
228 | #else |
301 | #else |
229 | error unsupported architecture |
302 | # error unsupported architecture |
230 | #endif |
303 | #endif |
231 | } |
304 | } |
232 | |
305 | |