drm/i915: Mark the context and address space as closed
[linux/fpc-iii.git] / arch / um / os-Linux / main.c
blob9d499de87e63e5e5b46a5dca97224fefd9067512
1 /*
2 * Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de)
3 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
4 * Licensed under the GPL
5 */
7 #include <stdio.h>
8 #include <stdlib.h>
9 #include <unistd.h>
10 #include <errno.h>
11 #include <signal.h>
12 #include <string.h>
13 #include <sys/resource.h>
14 #include <as-layout.h>
15 #include <init.h>
16 #include <kern_util.h>
17 #include <os.h>
18 #include <um_malloc.h>
20 #define PGD_BOUND (4 * 1024 * 1024)
21 #define STACKSIZE (8 * 1024 * 1024)
22 #define THREAD_NAME_LEN (256)
24 long elf_aux_hwcap;
26 static void set_stklim(void)
28 struct rlimit lim;
30 if (getrlimit(RLIMIT_STACK, &lim) < 0) {
31 perror("getrlimit");
32 exit(1);
34 if ((lim.rlim_cur == RLIM_INFINITY) || (lim.rlim_cur > STACKSIZE)) {
35 lim.rlim_cur = STACKSIZE;
36 if (setrlimit(RLIMIT_STACK, &lim) < 0) {
37 perror("setrlimit");
38 exit(1);
43 static __init void do_uml_initcalls(void)
45 initcall_t *call;
47 call = &__uml_initcall_start;
48 while (call < &__uml_initcall_end) {
49 (*call)();
50 call++;
54 static void last_ditch_exit(int sig)
56 uml_cleanup();
57 exit(1);
60 static void install_fatal_handler(int sig)
62 struct sigaction action;
64 /* All signals are enabled in this handler ... */
65 sigemptyset(&action.sa_mask);
68 * ... including the signal being handled, plus we want the
69 * handler reset to the default behavior, so that if an exit
70 * handler is hanging for some reason, the UML will just die
71 * after this signal is sent a second time.
73 action.sa_flags = SA_RESETHAND | SA_NODEFER;
74 action.sa_restorer = NULL;
75 action.sa_handler = last_ditch_exit;
76 if (sigaction(sig, &action, NULL) < 0) {
77 printf("failed to install handler for signal %d - errno = %d\n",
78 sig, errno);
79 exit(1);
83 #define UML_LIB_PATH ":" OS_LIB_PATH "/uml"
85 static void setup_env_path(void)
87 char *new_path = NULL;
88 char *old_path = NULL;
89 int path_len = 0;
91 old_path = getenv("PATH");
93 * if no PATH variable is set or it has an empty value
94 * just use the default + /usr/lib/uml
96 if (!old_path || (path_len = strlen(old_path)) == 0) {
97 if (putenv("PATH=:/bin:/usr/bin/" UML_LIB_PATH))
98 perror("couldn't putenv");
99 return;
102 /* append /usr/lib/uml to the existing path */
103 path_len += strlen("PATH=" UML_LIB_PATH) + 1;
104 new_path = malloc(path_len);
105 if (!new_path) {
106 perror("couldn't malloc to set a new PATH");
107 return;
109 snprintf(new_path, path_len, "PATH=%s" UML_LIB_PATH, old_path);
110 if (putenv(new_path)) {
111 perror("couldn't putenv to set a new PATH");
112 free(new_path);
116 extern void scan_elf_aux( char **envp);
118 int __init main(int argc, char **argv, char **envp)
120 char **new_argv;
121 int ret, i, err;
123 set_stklim();
125 setup_env_path();
127 setsid();
129 new_argv = malloc((argc + 1) * sizeof(char *));
130 if (new_argv == NULL) {
131 perror("Mallocing argv");
132 exit(1);
134 for (i = 0; i < argc; i++) {
135 new_argv[i] = strdup(argv[i]);
136 if (new_argv[i] == NULL) {
137 perror("Mallocing an arg");
138 exit(1);
141 new_argv[argc] = NULL;
144 * Allow these signals to bring down a UML if all other
145 * methods of control fail.
147 install_fatal_handler(SIGINT);
148 install_fatal_handler(SIGTERM);
150 #ifdef CONFIG_ARCH_REUSE_HOST_VSYSCALL_AREA
151 scan_elf_aux(envp);
152 #endif
154 do_uml_initcalls();
155 change_sig(SIGPIPE, 0);
156 ret = linux_main(argc, argv);
159 * Disable SIGPROF - I have no idea why libc doesn't do this or turn
160 * off the profiling time, but UML dies with a SIGPROF just before
161 * exiting when profiling is active.
163 change_sig(SIGPROF, 0);
166 * This signal stuff used to be in the reboot case. However,
167 * sometimes a timer signal can come in when we're halting (reproducably
168 * when writing out gcov information, presumably because that takes
169 * some time) and cause a segfault.
172 /* stop timers and set timer signal to be ignored */
173 os_timer_disable();
175 /* disable SIGIO for the fds and set SIGIO to be ignored */
176 err = deactivate_all_fds();
177 if (err)
178 printf("deactivate_all_fds failed, errno = %d\n", -err);
181 * Let any pending signals fire now. This ensures
182 * that they won't be delivered after the exec, when
183 * they are definitely not expected.
185 unblock_signals();
187 /* Reboot */
188 if (ret) {
189 printf("\n");
190 execvp(new_argv[0], new_argv);
191 perror("Failed to exec kernel");
192 ret = 1;
194 printf("\n");
195 return uml_exitcode;
198 extern void *__real_malloc(int);
200 void *__wrap_malloc(int size)
202 void *ret;
204 if (!kmalloc_ok)
205 return __real_malloc(size);
206 else if (size <= UM_KERN_PAGE_SIZE)
207 /* finding contiguous pages can be hard*/
208 ret = uml_kmalloc(size, UM_GFP_KERNEL);
209 else ret = vmalloc(size);
212 * glibc people insist that if malloc fails, errno should be
213 * set by malloc as well. So we do.
215 if (ret == NULL)
216 errno = ENOMEM;
218 return ret;
221 void *__wrap_calloc(int n, int size)
223 void *ptr = __wrap_malloc(n * size);
225 if (ptr == NULL)
226 return NULL;
227 memset(ptr, 0, n * size);
228 return ptr;
231 extern void __real_free(void *);
233 extern unsigned long high_physmem;
235 void __wrap_free(void *ptr)
237 unsigned long addr = (unsigned long) ptr;
240 * We need to know how the allocation happened, so it can be correctly
241 * freed. This is done by seeing what region of memory the pointer is
242 * in -
243 * physical memory - kmalloc/kfree
244 * kernel virtual memory - vmalloc/vfree
245 * anywhere else - malloc/free
246 * If kmalloc is not yet possible, then either high_physmem and/or
247 * end_vm are still 0 (as at startup), in which case we call free, or
248 * we have set them, but anyway addr has not been allocated from those
249 * areas. So, in both cases __real_free is called.
251 * CAN_KMALLOC is checked because it would be bad to free a buffer
252 * with kmalloc/vmalloc after they have been turned off during
253 * shutdown.
254 * XXX: However, we sometimes shutdown CAN_KMALLOC temporarily, so
255 * there is a possibility for memory leaks.
258 if ((addr >= uml_physmem) && (addr < high_physmem)) {
259 if (kmalloc_ok)
260 kfree(ptr);
262 else if ((addr >= start_vm) && (addr < end_vm)) {
263 if (kmalloc_ok)
264 vfree(ptr);
266 else __real_free(ptr);