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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2000, 2001 Jeff Dike (jdike@karaya.com) | |
3 | * Licensed under the GPL | |
4 | */ | |
5 | ||
6 | #include <unistd.h> | |
7 | #include <stdio.h> | |
8 | #include <stdlib.h> | |
9 | #include <string.h> | |
10 | #include <signal.h> | |
11 | #include <errno.h> | |
12 | #include <sys/resource.h> | |
13 | #include <sys/mman.h> | |
14 | #include <sys/user.h> | |
15 | #include <asm/page.h> | |
1da177e4 | 16 | #include "kern_util.h" |
4ff83ce1 | 17 | #include "as-layout.h" |
1da177e4 | 18 | #include "mem_user.h" |
1da177e4 LT |
19 | #include "irq_user.h" |
20 | #include "user.h" | |
21 | #include "init.h" | |
22 | #include "mode.h" | |
23 | #include "choose-mode.h" | |
24 | #include "uml-config.h" | |
1da177e4 | 25 | #include "os.h" |
c13e5690 | 26 | #include "um_malloc.h" |
1da177e4 | 27 | |
11100b1d | 28 | /* Set in main, unchanged thereafter */ |
1da177e4 LT |
29 | char *linux_prog; |
30 | ||
31 | #define PGD_BOUND (4 * 1024 * 1024) | |
32 | #define STACKSIZE (8 * 1024 * 1024) | |
33 | #define THREAD_NAME_LEN (256) | |
34 | ||
35 | static void set_stklim(void) | |
36 | { | |
37 | struct rlimit lim; | |
38 | ||
39 | if(getrlimit(RLIMIT_STACK, &lim) < 0){ | |
40 | perror("getrlimit"); | |
41 | exit(1); | |
42 | } | |
43 | if((lim.rlim_cur == RLIM_INFINITY) || (lim.rlim_cur > STACKSIZE)){ | |
44 | lim.rlim_cur = STACKSIZE; | |
45 | if(setrlimit(RLIMIT_STACK, &lim) < 0){ | |
46 | perror("setrlimit"); | |
47 | exit(1); | |
48 | } | |
49 | } | |
1da177e4 LT |
50 | } |
51 | ||
52 | static __init void do_uml_initcalls(void) | |
53 | { | |
54 | initcall_t *call; | |
55 | ||
56 | call = &__uml_initcall_start; | |
f2183125 | 57 | while (call < &__uml_initcall_end){ |
1da177e4 LT |
58 | (*call)(); |
59 | call++; | |
60 | } | |
61 | } | |
62 | ||
63 | static void last_ditch_exit(int sig) | |
64 | { | |
1da177e4 LT |
65 | uml_cleanup(); |
66 | exit(1); | |
67 | } | |
68 | ||
4b84c69b JD |
69 | static void install_fatal_handler(int sig) |
70 | { | |
71 | struct sigaction action; | |
72 | ||
73 | /* All signals are enabled in this handler ... */ | |
74 | sigemptyset(&action.sa_mask); | |
75 | ||
76 | /* ... including the signal being handled, plus we want the | |
77 | * handler reset to the default behavior, so that if an exit | |
78 | * handler is hanging for some reason, the UML will just die | |
79 | * after this signal is sent a second time. | |
80 | */ | |
81 | action.sa_flags = SA_RESETHAND | SA_NODEFER; | |
82 | action.sa_restorer = NULL; | |
83 | action.sa_handler = last_ditch_exit; | |
84 | if(sigaction(sig, &action, NULL) < 0){ | |
85 | printf("failed to install handler for signal %d - errno = %d\n", | |
86 | errno); | |
87 | exit(1); | |
88 | } | |
89 | } | |
90 | ||
cb98cdcd MD |
91 | #define UML_LIB_PATH ":/usr/lib/uml" |
92 | ||
93 | static void setup_env_path(void) | |
94 | { | |
95 | char *new_path = NULL; | |
96 | char *old_path = NULL; | |
97 | int path_len = 0; | |
98 | ||
99 | old_path = getenv("PATH"); | |
100 | /* if no PATH variable is set or it has an empty value | |
101 | * just use the default + /usr/lib/uml | |
102 | */ | |
103 | if (!old_path || (path_len = strlen(old_path)) == 0) { | |
104 | putenv("PATH=:/bin:/usr/bin/" UML_LIB_PATH); | |
105 | return; | |
106 | } | |
107 | ||
108 | /* append /usr/lib/uml to the existing path */ | |
109 | path_len += strlen("PATH=" UML_LIB_PATH) + 1; | |
110 | new_path = malloc(path_len); | |
111 | if (!new_path) { | |
112 | perror("coudn't malloc to set a new PATH"); | |
113 | return; | |
114 | } | |
115 | snprintf(new_path, path_len, "PATH=%s" UML_LIB_PATH, old_path); | |
116 | putenv(new_path); | |
117 | } | |
118 | ||
1da177e4 LT |
119 | extern int uml_exitcode; |
120 | ||
121 | extern void scan_elf_aux( char **envp); | |
122 | ||
123 | int main(int argc, char **argv, char **envp) | |
124 | { | |
125 | char **new_argv; | |
92515da7 | 126 | int ret, i, err; |
1da177e4 | 127 | |
02215759 | 128 | #ifdef UML_CONFIG_CMDLINE_ON_HOST |
1da177e4 LT |
129 | /* Allocate memory for thread command lines */ |
130 | if(argc < 2 || strlen(argv[1]) < THREAD_NAME_LEN - 1){ | |
131 | ||
132 | char padding[THREAD_NAME_LEN] = { | |
133 | [ 0 ... THREAD_NAME_LEN - 2] = ' ', '\0' | |
134 | }; | |
135 | ||
136 | new_argv = malloc((argc + 2) * sizeof(char*)); | |
137 | if(!new_argv) { | |
138 | perror("Allocating extended argv"); | |
139 | exit(1); | |
140 | } | |
141 | ||
142 | new_argv[0] = argv[0]; | |
143 | new_argv[1] = padding; | |
144 | ||
145 | for(i = 2; i <= argc; i++) | |
146 | new_argv[i] = argv[i - 1]; | |
147 | new_argv[argc + 1] = NULL; | |
148 | ||
149 | execvp(new_argv[0], new_argv); | |
150 | perror("execing with extended args"); | |
151 | exit(1); | |
152 | } | |
153 | #endif | |
154 | ||
155 | linux_prog = argv[0]; | |
156 | ||
157 | set_stklim(); | |
158 | ||
cb98cdcd MD |
159 | setup_env_path(); |
160 | ||
1da177e4 LT |
161 | new_argv = malloc((argc + 1) * sizeof(char *)); |
162 | if(new_argv == NULL){ | |
163 | perror("Mallocing argv"); | |
164 | exit(1); | |
165 | } | |
166 | for(i=0;i<argc;i++){ | |
167 | new_argv[i] = strdup(argv[i]); | |
168 | if(new_argv[i] == NULL){ | |
169 | perror("Mallocing an arg"); | |
170 | exit(1); | |
171 | } | |
172 | } | |
173 | new_argv[argc] = NULL; | |
174 | ||
4b84c69b JD |
175 | /* Allow these signals to bring down a UML if all other |
176 | * methods of control fail. | |
177 | */ | |
178 | install_fatal_handler(SIGINT); | |
179 | install_fatal_handler(SIGTERM); | |
180 | install_fatal_handler(SIGHUP); | |
1da177e4 LT |
181 | |
182 | scan_elf_aux( envp); | |
183 | ||
184 | do_uml_initcalls(); | |
185 | ret = linux_main(argc, argv); | |
186 | ||
187 | /* Disable SIGPROF - I have no idea why libc doesn't do this or turn | |
188 | * off the profiling time, but UML dies with a SIGPROF just before | |
189 | * exiting when profiling is active. | |
190 | */ | |
191 | change_sig(SIGPROF, 0); | |
192 | ||
52c653b3 JD |
193 | /* This signal stuff used to be in the reboot case. However, |
194 | * sometimes a SIGVTALRM can come in when we're halting (reproducably | |
195 | * when writing out gcov information, presumably because that takes | |
196 | * some time) and cause a segfault. | |
197 | */ | |
198 | ||
199 | /* stop timers and set SIG*ALRM to be ignored */ | |
200 | disable_timer(); | |
201 | ||
202 | /* disable SIGIO for the fds and set SIGIO to be ignored */ | |
203 | err = deactivate_all_fds(); | |
204 | if(err) | |
205 | printf("deactivate_all_fds failed, errno = %d\n", -err); | |
206 | ||
207 | /* Let any pending signals fire now. This ensures | |
208 | * that they won't be delivered after the exec, when | |
209 | * they are definitely not expected. | |
210 | */ | |
211 | unblock_signals(); | |
1da177e4 | 212 | |
92515da7 JD |
213 | /* Reboot */ |
214 | if(ret){ | |
215 | printf("\n"); | |
1da177e4 LT |
216 | execvp(new_argv[0], new_argv); |
217 | perror("Failed to exec kernel"); | |
218 | ret = 1; | |
219 | } | |
220 | printf("\n"); | |
a5ed1ffa | 221 | return uml_exitcode; |
1da177e4 LT |
222 | } |
223 | ||
224 | #define CAN_KMALLOC() \ | |
225 | (kmalloc_ok && CHOOSE_MODE((os_getpid() != tracing_pid), 1)) | |
226 | ||
227 | extern void *__real_malloc(int); | |
228 | ||
229 | void *__wrap_malloc(int size) | |
230 | { | |
231 | void *ret; | |
232 | ||
233 | if(!CAN_KMALLOC()) | |
a5ed1ffa | 234 | return __real_malloc(size); |
1da177e4 LT |
235 | else if(size <= PAGE_SIZE) /* finding contiguos pages can be hard*/ |
236 | ret = um_kmalloc(size); | |
237 | else ret = um_vmalloc(size); | |
238 | ||
239 | /* glibc people insist that if malloc fails, errno should be | |
240 | * set by malloc as well. So we do. | |
241 | */ | |
242 | if(ret == NULL) | |
243 | errno = ENOMEM; | |
244 | ||
a5ed1ffa | 245 | return ret; |
1da177e4 LT |
246 | } |
247 | ||
248 | void *__wrap_calloc(int n, int size) | |
249 | { | |
250 | void *ptr = __wrap_malloc(n * size); | |
251 | ||
a5ed1ffa JD |
252 | if(ptr == NULL) |
253 | return NULL; | |
1da177e4 | 254 | memset(ptr, 0, n * size); |
a5ed1ffa | 255 | return ptr; |
1da177e4 LT |
256 | } |
257 | ||
258 | extern void __real_free(void *); | |
259 | ||
260 | extern unsigned long high_physmem; | |
261 | ||
262 | void __wrap_free(void *ptr) | |
263 | { | |
264 | unsigned long addr = (unsigned long) ptr; | |
265 | ||
266 | /* We need to know how the allocation happened, so it can be correctly | |
267 | * freed. This is done by seeing what region of memory the pointer is | |
268 | * in - | |
269 | * physical memory - kmalloc/kfree | |
270 | * kernel virtual memory - vmalloc/vfree | |
271 | * anywhere else - malloc/free | |
272 | * If kmalloc is not yet possible, then either high_physmem and/or | |
273 | * end_vm are still 0 (as at startup), in which case we call free, or | |
274 | * we have set them, but anyway addr has not been allocated from those | |
275 | * areas. So, in both cases __real_free is called. | |
276 | * | |
277 | * CAN_KMALLOC is checked because it would be bad to free a buffer | |
278 | * with kmalloc/vmalloc after they have been turned off during | |
279 | * shutdown. | |
280 | * XXX: However, we sometimes shutdown CAN_KMALLOC temporarily, so | |
281 | * there is a possibility for memory leaks. | |
282 | */ | |
283 | ||
284 | if((addr >= uml_physmem) && (addr < high_physmem)){ | |
285 | if(CAN_KMALLOC()) | |
286 | kfree(ptr); | |
287 | } | |
288 | else if((addr >= start_vm) && (addr < end_vm)){ | |
289 | if(CAN_KMALLOC()) | |
290 | vfree(ptr); | |
291 | } | |
292 | else __real_free(ptr); | |
293 | } |