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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> | |
16 | #include "user_util.h" | |
17 | #include "kern_util.h" | |
18 | #include "mem_user.h" | |
19 | #include "signal_user.h" | |
20 | #include "time_user.h" | |
21 | #include "irq_user.h" | |
22 | #include "user.h" | |
23 | #include "init.h" | |
24 | #include "mode.h" | |
25 | #include "choose-mode.h" | |
26 | #include "uml-config.h" | |
27 | #include "irq_user.h" | |
28 | #include "time_user.h" | |
29 | #include "os.h" | |
30 | ||
31 | /* Set in set_stklim, which is called from main and __wrap_malloc. | |
32 | * __wrap_malloc only calls it if main hasn't started. | |
33 | */ | |
34 | unsigned long stacksizelim; | |
35 | ||
36 | /* Set in main */ | |
37 | char *linux_prog; | |
38 | ||
39 | #define PGD_BOUND (4 * 1024 * 1024) | |
40 | #define STACKSIZE (8 * 1024 * 1024) | |
41 | #define THREAD_NAME_LEN (256) | |
42 | ||
43 | static void set_stklim(void) | |
44 | { | |
45 | struct rlimit lim; | |
46 | ||
47 | if(getrlimit(RLIMIT_STACK, &lim) < 0){ | |
48 | perror("getrlimit"); | |
49 | exit(1); | |
50 | } | |
51 | if((lim.rlim_cur == RLIM_INFINITY) || (lim.rlim_cur > STACKSIZE)){ | |
52 | lim.rlim_cur = STACKSIZE; | |
53 | if(setrlimit(RLIMIT_STACK, &lim) < 0){ | |
54 | perror("setrlimit"); | |
55 | exit(1); | |
56 | } | |
57 | } | |
58 | stacksizelim = (lim.rlim_cur + PGD_BOUND - 1) & ~(PGD_BOUND - 1); | |
59 | } | |
60 | ||
61 | static __init void do_uml_initcalls(void) | |
62 | { | |
63 | initcall_t *call; | |
64 | ||
65 | call = &__uml_initcall_start; | |
66 | while (call < &__uml_initcall_end){; | |
67 | (*call)(); | |
68 | call++; | |
69 | } | |
70 | } | |
71 | ||
72 | static void last_ditch_exit(int sig) | |
73 | { | |
6770cb61 | 74 | kmalloc_ok = 0; |
1da177e4 LT |
75 | signal(SIGINT, SIG_DFL); |
76 | signal(SIGTERM, SIG_DFL); | |
77 | signal(SIGHUP, SIG_DFL); | |
78 | uml_cleanup(); | |
79 | exit(1); | |
80 | } | |
81 | ||
82 | extern int uml_exitcode; | |
83 | ||
84 | extern void scan_elf_aux( char **envp); | |
85 | ||
86 | int main(int argc, char **argv, char **envp) | |
87 | { | |
88 | char **new_argv; | |
89 | sigset_t mask; | |
90 | int ret, i; | |
91 | ||
92 | /* Enable all signals except SIGIO - in some environments, we can | |
93 | * enter with some signals blocked | |
94 | */ | |
95 | ||
96 | sigemptyset(&mask); | |
97 | sigaddset(&mask, SIGIO); | |
98 | if(sigprocmask(SIG_SETMASK, &mask, NULL) < 0){ | |
99 | perror("sigprocmask"); | |
100 | exit(1); | |
101 | } | |
102 | ||
103 | #ifdef UML_CONFIG_MODE_TT | |
104 | /* Allocate memory for thread command lines */ | |
105 | if(argc < 2 || strlen(argv[1]) < THREAD_NAME_LEN - 1){ | |
106 | ||
107 | char padding[THREAD_NAME_LEN] = { | |
108 | [ 0 ... THREAD_NAME_LEN - 2] = ' ', '\0' | |
109 | }; | |
110 | ||
111 | new_argv = malloc((argc + 2) * sizeof(char*)); | |
112 | if(!new_argv) { | |
113 | perror("Allocating extended argv"); | |
114 | exit(1); | |
115 | } | |
116 | ||
117 | new_argv[0] = argv[0]; | |
118 | new_argv[1] = padding; | |
119 | ||
120 | for(i = 2; i <= argc; i++) | |
121 | new_argv[i] = argv[i - 1]; | |
122 | new_argv[argc + 1] = NULL; | |
123 | ||
124 | execvp(new_argv[0], new_argv); | |
125 | perror("execing with extended args"); | |
126 | exit(1); | |
127 | } | |
128 | #endif | |
129 | ||
130 | linux_prog = argv[0]; | |
131 | ||
132 | set_stklim(); | |
133 | ||
134 | new_argv = malloc((argc + 1) * sizeof(char *)); | |
135 | if(new_argv == NULL){ | |
136 | perror("Mallocing argv"); | |
137 | exit(1); | |
138 | } | |
139 | for(i=0;i<argc;i++){ | |
140 | new_argv[i] = strdup(argv[i]); | |
141 | if(new_argv[i] == NULL){ | |
142 | perror("Mallocing an arg"); | |
143 | exit(1); | |
144 | } | |
145 | } | |
146 | new_argv[argc] = NULL; | |
147 | ||
148 | set_handler(SIGINT, last_ditch_exit, SA_ONESHOT | SA_NODEFER, -1); | |
149 | set_handler(SIGTERM, last_ditch_exit, SA_ONESHOT | SA_NODEFER, -1); | |
150 | set_handler(SIGHUP, last_ditch_exit, SA_ONESHOT | SA_NODEFER, -1); | |
151 | ||
152 | scan_elf_aux( envp); | |
153 | ||
154 | do_uml_initcalls(); | |
155 | ret = linux_main(argc, argv); | |
156 | ||
157 | /* Disable SIGPROF - I have no idea why libc doesn't do this or turn | |
158 | * off the profiling time, but UML dies with a SIGPROF just before | |
159 | * exiting when profiling is active. | |
160 | */ | |
161 | change_sig(SIGPROF, 0); | |
162 | ||
163 | /* Reboot */ | |
164 | if(ret){ | |
165 | int err; | |
166 | ||
167 | printf("\n"); | |
168 | ||
169 | /* stop timers and set SIG*ALRM to be ignored */ | |
170 | disable_timer(); | |
171 | ||
172 | /* disable SIGIO for the fds and set SIGIO to be ignored */ | |
173 | err = deactivate_all_fds(); | |
174 | if(err) | |
175 | printf("deactivate_all_fds failed, errno = %d\n", | |
176 | -err); | |
177 | ||
178 | /* Let any pending signals fire now. This ensures | |
179 | * that they won't be delivered after the exec, when | |
180 | * they are definitely not expected. | |
181 | */ | |
182 | unblock_signals(); | |
183 | ||
184 | execvp(new_argv[0], new_argv); | |
185 | perror("Failed to exec kernel"); | |
186 | ret = 1; | |
187 | } | |
188 | printf("\n"); | |
189 | return(uml_exitcode); | |
190 | } | |
191 | ||
192 | #define CAN_KMALLOC() \ | |
193 | (kmalloc_ok && CHOOSE_MODE((os_getpid() != tracing_pid), 1)) | |
194 | ||
195 | extern void *__real_malloc(int); | |
196 | ||
197 | void *__wrap_malloc(int size) | |
198 | { | |
199 | void *ret; | |
200 | ||
201 | if(!CAN_KMALLOC()) | |
202 | return(__real_malloc(size)); | |
203 | else if(size <= PAGE_SIZE) /* finding contiguos pages can be hard*/ | |
204 | ret = um_kmalloc(size); | |
205 | else ret = um_vmalloc(size); | |
206 | ||
207 | /* glibc people insist that if malloc fails, errno should be | |
208 | * set by malloc as well. So we do. | |
209 | */ | |
210 | if(ret == NULL) | |
211 | errno = ENOMEM; | |
212 | ||
213 | return(ret); | |
214 | } | |
215 | ||
216 | void *__wrap_calloc(int n, int size) | |
217 | { | |
218 | void *ptr = __wrap_malloc(n * size); | |
219 | ||
220 | if(ptr == NULL) return(NULL); | |
221 | memset(ptr, 0, n * size); | |
222 | return(ptr); | |
223 | } | |
224 | ||
225 | extern void __real_free(void *); | |
226 | ||
227 | extern unsigned long high_physmem; | |
228 | ||
229 | void __wrap_free(void *ptr) | |
230 | { | |
231 | unsigned long addr = (unsigned long) ptr; | |
232 | ||
233 | /* We need to know how the allocation happened, so it can be correctly | |
234 | * freed. This is done by seeing what region of memory the pointer is | |
235 | * in - | |
236 | * physical memory - kmalloc/kfree | |
237 | * kernel virtual memory - vmalloc/vfree | |
238 | * anywhere else - malloc/free | |
239 | * If kmalloc is not yet possible, then either high_physmem and/or | |
240 | * end_vm are still 0 (as at startup), in which case we call free, or | |
241 | * we have set them, but anyway addr has not been allocated from those | |
242 | * areas. So, in both cases __real_free is called. | |
243 | * | |
244 | * CAN_KMALLOC is checked because it would be bad to free a buffer | |
245 | * with kmalloc/vmalloc after they have been turned off during | |
246 | * shutdown. | |
247 | * XXX: However, we sometimes shutdown CAN_KMALLOC temporarily, so | |
248 | * there is a possibility for memory leaks. | |
249 | */ | |
250 | ||
251 | if((addr >= uml_physmem) && (addr < high_physmem)){ | |
252 | if(CAN_KMALLOC()) | |
253 | kfree(ptr); | |
254 | } | |
255 | else if((addr >= start_vm) && (addr < end_vm)){ | |
256 | if(CAN_KMALLOC()) | |
257 | vfree(ptr); | |
258 | } | |
259 | else __real_free(ptr); | |
260 | } | |
261 | ||
262 | /* | |
263 | * Overrides for Emacs so that we follow Linus's tabbing style. | |
264 | * Emacs will notice this stuff at the end of the file and automatically | |
265 | * adjust the settings for this buffer only. This must remain at the end | |
266 | * of the file. | |
267 | * --------------------------------------------------------------------------- | |
268 | * Local variables: | |
269 | * c-file-style: "linux" | |
270 | * End: | |
271 | */ |