2 * Copyright (C) 2000, 2001 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
12 #include <sys/resource.h>
16 #include "user_util.h"
17 #include "kern_util.h"
19 #include "signal_user.h"
20 #include "time_user.h"
25 #include "choose-mode.h"
26 #include "uml-config.h"
28 /* Set in set_stklim, which is called from main and __wrap_malloc.
29 * __wrap_malloc only calls it if main hasn't started.
31 unsigned long stacksizelim;
36 #define PGD_BOUND (4 * 1024 * 1024)
37 #define STACKSIZE (8 * 1024 * 1024)
38 #define THREAD_NAME_LEN (256)
40 static void set_stklim(void)
44 if(getrlimit(RLIMIT_STACK, &lim) < 0){
48 if((lim.rlim_cur == RLIM_INFINITY) || (lim.rlim_cur > STACKSIZE)){
49 lim.rlim_cur = STACKSIZE;
50 if(setrlimit(RLIMIT_STACK, &lim) < 0){
55 stacksizelim = (lim.rlim_cur + PGD_BOUND - 1) & ~(PGD_BOUND - 1);
58 static __init void do_uml_initcalls(void)
62 call = &__uml_initcall_start;
63 while (call < &__uml_initcall_end){;
69 static void last_ditch_exit(int sig)
71 CHOOSE_MODE(kmalloc_ok = 0, (void) 0);
72 signal(SIGINT, SIG_DFL);
73 signal(SIGTERM, SIG_DFL);
74 signal(SIGHUP, SIG_DFL);
79 extern int uml_exitcode;
81 int main(int argc, char **argv, char **envp)
87 /* Enable all signals except SIGIO - in some environments, we can
88 * enter with some signals blocked
92 sigaddset(&mask, SIGIO);
93 if(sigprocmask(SIG_SETMASK, &mask, NULL) < 0){
94 perror("sigprocmask");
98 #ifdef UML_CONFIG_MODE_TT
99 /* Allocate memory for thread command lines */
100 if(argc < 2 || strlen(argv[1]) < THREAD_NAME_LEN - 1){
102 char padding[THREAD_NAME_LEN] = {
103 [ 0 ... THREAD_NAME_LEN - 2] = ' ', '\0'
106 new_argv = malloc((argc + 2) * sizeof(char*));
108 perror("Allocating extended argv");
112 new_argv[0] = argv[0];
113 new_argv[1] = padding;
115 for(i = 2; i <= argc; i++)
116 new_argv[i] = argv[i - 1];
117 new_argv[argc + 1] = NULL;
119 execvp(new_argv[0], new_argv);
120 perror("execing with extended args");
125 linux_prog = argv[0];
129 new_argv = malloc((argc + 1) * sizeof(char *));
130 if(new_argv == NULL){
131 perror("Mallocing argv");
135 new_argv[i] = strdup(argv[i]);
136 if(new_argv[i] == NULL){
137 perror("Mallocing an arg");
141 new_argv[argc] = NULL;
143 set_handler(SIGINT, last_ditch_exit, SA_ONESHOT | SA_NODEFER, -1);
144 set_handler(SIGTERM, last_ditch_exit, SA_ONESHOT | SA_NODEFER, -1);
145 set_handler(SIGHUP, last_ditch_exit, SA_ONESHOT | SA_NODEFER, -1);
148 ret = linux_main(argc, argv);
156 /* Let any pending signals fire, then disable them. This
157 * ensures that they won't be delivered after the exec, when
158 * they are definitely not expected.
162 err = deactivate_all_fds();
164 printf("deactivate_all_fds failed, errno = %d\n", -err);
166 execvp(new_argv[0], new_argv);
167 perror("Failed to exec kernel");
171 return(uml_exitcode);
174 #define CAN_KMALLOC() \
175 (kmalloc_ok && CHOOSE_MODE((getpid() != tracing_pid), 1))
177 extern void *__real_malloc(int);
179 void *__wrap_malloc(int size)
184 return(__real_malloc(size));
185 else if(size <= PAGE_SIZE) /* finding contiguos pages is hard */
186 ret = um_kmalloc(size);
187 else ret = um_vmalloc(size);
189 /* glibc people insist that if malloc fails, errno should be
190 * set by malloc as well. So we do.
198 void *__wrap_calloc(int n, int size)
200 void *ptr = __wrap_malloc(n * size);
202 if(ptr == NULL) return(NULL);
203 memset(ptr, 0, n * size);
207 extern void __real_free(void *);
209 extern unsigned long high_physmem;
211 void __wrap_free(void *ptr)
213 unsigned long addr = (unsigned long) ptr;
215 /* We need to know how the allocation happened, so it can be correctly
216 * freed. This is done by seeing what region of memory the pointer is
218 * physical memory - kmalloc/kfree
219 * kernel virtual memory - vmalloc/vfree
220 * anywhere else - malloc/free
221 * If kmalloc is not yet possible, then the kernel memory regions
222 * may not be set up yet, and the variables not set up. So,
225 * CAN_KMALLOC is checked because it would be bad to free a buffer
226 * with kmalloc/vmalloc after they have been turned off during
230 if((addr >= uml_physmem) && (addr < high_physmem)){
234 else if((addr >= start_vm) && (addr < end_vm)){
238 else __real_free(ptr);
242 * Overrides for Emacs so that we follow Linus's tabbing style.
243 * Emacs will notice this stuff at the end of the file and automatically
244 * adjust the settings for this buffer only. This must remain at the end
246 * ---------------------------------------------------------------------------
248 * c-file-style: "linux"