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, |
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51 | |
51 | |
52 | #if CORO_UCONTEXT |
52 | #if CORO_UCONTEXT |
53 | # include <stddef.h> |
53 | # include <stddef.h> |
54 | #endif |
54 | #endif |
55 | |
55 | |
56 | #if CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX |
56 | #if CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM |
57 | |
57 | |
58 | #include <stdlib.h> |
58 | #include <stdlib.h> |
59 | |
59 | |
60 | #if CORO_SJLJ |
60 | #if CORO_SJLJ |
61 | # include <stdio.h> |
61 | # include <stdio.h> |
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65 | |
65 | |
66 | static volatile coro_func coro_init_func; |
66 | static volatile coro_func coro_init_func; |
67 | static volatile void *coro_init_arg; |
67 | static volatile void *coro_init_arg; |
68 | static volatile coro_context *new_coro, *create_coro; |
68 | static volatile coro_context *new_coro, *create_coro; |
69 | |
69 | |
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70 | /* what we really want to detect here is wether we use a new-enough version of GAS */ |
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71 | /* instead, check for gcc 3, ELF and GNU/Linux and hope for the best */ |
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72 | #if __GNUC__ >= 3 && __ELF__ && __linux__ |
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73 | # define HAVE_CFI 1 |
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74 | #endif |
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75 | |
70 | static void |
76 | static void |
71 | coro_init (void) |
77 | coro_init (void) |
72 | { |
78 | { |
73 | volatile coro_func func = coro_init_func; |
79 | volatile coro_func func = coro_init_func; |
74 | volatile void *arg = coro_init_arg; |
80 | volatile void *arg = coro_init_arg; |
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88 | /* trampoline signal handler */ |
94 | /* trampoline signal handler */ |
89 | static void |
95 | static void |
90 | trampoline (int sig) |
96 | trampoline (int sig) |
91 | { |
97 | { |
92 | if (setjmp (((coro_context *)new_coro)->env)) |
98 | if (setjmp (((coro_context *)new_coro)->env)) |
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99 | { |
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100 | #if HAVE_CFI |
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101 | asm (".cfi_startproc"); |
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102 | #endif |
93 | coro_init (); /* start it */ |
103 | coro_init (); /* start it */ |
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104 | #if HAVE_CFI |
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105 | asm (".cfi_endproc"); |
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106 | #endif |
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107 | } |
94 | else |
108 | else |
95 | trampoline_count++; |
109 | trampoline_count++; |
96 | } |
110 | } |
97 | |
111 | |
98 | # endif |
112 | # endif |
99 | |
113 | |
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114 | #endif |
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115 | |
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116 | #if CORO_ASM |
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117 | void __attribute__((__noinline__, __fastcall__)) |
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118 | coro_transfer (struct coro_context *prev, struct coro_context *next) |
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119 | { |
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120 | asm volatile ( |
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121 | #if __amd64 |
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122 | # define NUM_CLOBBERED 5 |
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123 | "push %%rbx\n\t" |
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124 | "push %%r12\n\t" |
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125 | "push %%r13\n\t" |
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126 | "push %%r14\n\t" |
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127 | "push %%r15\n\t" |
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128 | "mov %%rsp, %0\n\t" |
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129 | "mov %1, %%rsp\n\t" |
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130 | "pop %%r15\n\t" |
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131 | "pop %%r14\n\t" |
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132 | "pop %%r13\n\t" |
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133 | "pop %%r12\n\t" |
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134 | "pop %%rbx\n\t" |
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135 | #elif __i386 |
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136 | # define NUM_CLOBBERED 4 |
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137 | "push %%ebx\n\t" |
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138 | "push %%esi\n\t" |
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139 | "push %%edi\n\t" |
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140 | "push %%ebp\n\t" |
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141 | "mov %%esp, %0\n\t" |
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142 | "mov %1, %%esp\n\t" |
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143 | "pop %%ebp\n\t" |
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144 | "pop %%edi\n\t" |
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145 | "pop %%esi\n\t" |
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146 | "pop %%ebx\n\t" |
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147 | #else |
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148 | # error unsupported architecture |
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149 | #endif |
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150 | : "=m" (prev->sp) |
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151 | : "m" (next->sp) |
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152 | ); |
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153 | } |
100 | #endif |
154 | #endif |
101 | |
155 | |
102 | /* initialize a machine state */ |
156 | /* initialize a machine state */ |
103 | void coro_create (coro_context *ctx, |
157 | void coro_create (coro_context *ctx, |
104 | coro_func coro, void *arg, |
158 | coro_func coro, void *arg, |
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113 | 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); |
114 | ctx->uc.uc_stack.ss_flags = 0; |
168 | ctx->uc.uc_stack.ss_flags = 0; |
115 | |
169 | |
116 | makecontext (&(ctx->uc), (void (*)()) coro, 1, arg); |
170 | makecontext (&(ctx->uc), (void (*)()) coro, 1, arg); |
117 | |
171 | |
118 | #elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX |
172 | #elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM |
119 | |
173 | |
120 | # if CORO_SJLJ |
174 | # if CORO_SJLJ |
121 | stack_t ostk, nstk; |
175 | stack_t ostk, nstk; |
122 | struct sigaction osa, nsa; |
176 | struct sigaction osa, nsa; |
123 | sigset_t nsig, osig; |
177 | sigset_t nsig, osig; |
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214 | ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize); |
268 | ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize); |
215 | #elif defined (__GNU_LIBRARY__) && defined (__amd64__) |
269 | #elif defined (__GNU_LIBRARY__) && defined (__amd64__) |
216 | ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init; |
270 | ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init; |
217 | ctx->env[0].__jmpbuf[JB_RSP] = (long)STACK_ADJUST_PTR (sptr, ssize); |
271 | ctx->env[0].__jmpbuf[JB_RSP] = (long)STACK_ADJUST_PTR (sptr, ssize); |
218 | #else |
272 | #else |
219 | #error "linux libc or architecture not supported" |
273 | # error "linux libc or architecture not supported" |
220 | #endif |
274 | #endif |
221 | |
275 | |
222 | # elif CORO_IRIX |
276 | # elif CORO_IRIX |
223 | |
277 | |
224 | setjmp (ctx->env); |
278 | setjmp (ctx->env); |
225 | ctx->env[JB_PC] = (__uint64_t)coro_init; |
279 | ctx->env[JB_PC] = (__uint64_t)coro_init; |
226 | ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize); |
280 | ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize); |
227 | |
281 | |
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282 | # elif CORO_ASM |
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283 | |
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284 | ctx->sp = (volatile void **)(ssize + (char *)sptr); |
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285 | *--ctx->sp = (void *)coro_init; |
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286 | *--ctx->sp = (void *)coro_init; // this is needed when the prologue saves ebp |
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287 | ctx->sp -= NUM_CLOBBERED; |
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288 | |
228 | # endif |
289 | # endif |
229 | |
290 | |
230 | coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro); |
291 | coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro); |
231 | |
292 | |
232 | #else |
293 | #else |
233 | error unsupported architecture |
294 | # error unsupported architecture |
234 | #endif |
295 | #endif |
235 | } |
296 | } |
236 | |
297 | |