/*
* Copyright (C) 2000, 2001 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <errno.h>
#include <sys/resource.h>
#include <sys/mman.h>
#include <sys/user.h>
#include <asm/page.h>
#include "kern_util.h"
#include "as-layout.h"
#include "mem_user.h"
#include "irq_user.h"
#include "user.h"
#include "init.h"
#include "mode.h"
#include "choose-mode.h"
#include "uml-config.h"
#include "os.h"
#include "um_malloc.h"
#include "kern_constants.h"
/* Set in main, unchanged thereafter */
char *linux_prog;
#define PGD_BOUND (4 * 1024 * 1024)
#define STACKSIZE (8 * 1024 * 1024)
#define THREAD_NAME_LEN (256)
static void set_stklim(void)
{
struct rlimit lim;
if(getrlimit(RLIMIT_STACK, &lim) < 0){
perror("getrlimit");
exit(1);
}
if((lim.rlim_cur == RLIM_INFINITY) || (lim.rlim_cur > STACKSIZE)){
lim.rlim_cur = STACKSIZE;
if(setrlimit(RLIMIT_STACK, &lim) < 0){
perror("setrlimit");
exit(1);
}
}
}
static __init void do_uml_initcalls(void)
{
initcall_t *call;
call = &__uml_initcall_start;
while (call < &__uml_initcall_end){
(*call)();
call++;
}
}
static void last_ditch_exit(int sig)
{
uml_cleanup();
exit(1);
}
static void install_fatal_handler(int sig)
{
struct sigaction action;
/* All signals are enabled in this handler ... */
sigemptyset(&action.sa_mask);
/* ... including the signal being handled, plus we want the
* handler reset to the default behavior, so that if an exit
* handler is hanging for some reason, the UML will just die
* after this signal is sent a second time.
*/
action.sa_flags = SA_RESETHAND | SA_NODEFER;
action.sa_restorer = NULL;
action.sa_handler = last_ditch_exit;
if(sigaction(sig, &action, NULL) < 0){
printf("failed to install handler for signal %d - errno = %d\n",
errno);
exit(1);
}
}
#define UML_LIB_PATH ":/usr/lib/uml"
static void setup_env_path(void)
{
char *new_path = NULL;
char *old_path = NULL;
int path_len = 0;
old_path = getenv("PATH");
/* if no PATH variable is set or it has an empty value
* just use the default + /usr/lib/uml
*/
if (!old_path || (path_len = strlen(old_path)) == 0) {
putenv("PATH=:/bin:/usr/bin/" UML_LIB_PATH);
return;
}
/* append /usr/lib/uml to the existing path */
path_len += strlen("PATH=" UML_LIB_PATH) + 1;
new_path = malloc(path_len);
if (!new_path) {
perror("coudn't malloc to set a new PATH");
return;
}
snprintf(new_path, path_len, "PATH=%s" UML_LIB_PATH, old_path);
putenv(new_path);
}
extern int uml_exitcode;
extern void scan_elf_aux( char **envp);
int __init main(int argc, char **argv, char **envp)
{
char **new_argv;
int ret, i, err;
#ifdef UML_CONFIG_CMDLINE_ON_HOST
/* Allocate memory for thread command lines */
if(argc < 2 || strlen(argv[1]) < THREAD_NAME_LEN - 1){
char padding[THREAD_NAME_LEN] = {
[ 0 ... THREAD_NAME_LEN - 2] = ' ', '\0'
};
new_argv = malloc((argc + 2) * sizeof(char*));
if(!new_argv) {
perror("Allocating extended argv");
exit(1);
}
new_argv[0] = argv[0];
new_argv[1] = padding;
for(i = 2; i <= argc; i++)
new_argv[i] = argv[i - 1];
new_argv[argc + 1] = NULL;
execvp(new_argv[0], new_argv);
perror("execing with extended args");
exit(1);
}
#endif
linux_prog = argv[0];
set_stklim();
setup_env_path();
new_argv = malloc((argc + 1) * sizeof(char *));
if(new_argv == NULL){
perror("Mallocing argv");
exit(1);
}
for(i=0;i<argc;i++){
new_argv[i] = strdup(argv[i]);
if(new_argv[i] == NULL){
perror("Mallocing an arg");
exit(1);
}
}
new_argv[argc] = NULL;
/* Allow these signals to bring down a UML if all other
* methods of control fail.
*/
install_fatal_handler(SIGINT);
install_fatal_handler(SIGTERM);
install_fatal_handler(SIGHUP);
scan_elf_aux( envp);
do_uml_initcalls();
ret = linux_main(argc, argv);
/* Disable SIGPROF - I have no idea why libc doesn't do this or turn
* off the profiling time, but UML dies with a SIGPROF just before
* exiting when profiling is active.
*/
change_sig(SIGPROF, 0);
/* This signal stuff used to be in the reboot case. However,
* sometimes a SIGVTALRM can come in when we're halting (reproducably
* when writing out gcov information, presumably because that takes
* some time) and cause a segfault.
*/
/* stop timers and set SIG*ALRM to be ignored */
disable_timer();
/* disable SIGIO for the fds and set SIGIO to be ignored */
err = deactivate_all_fds();
if(err)
printf("deactivate_all_fds failed, errno = %d\n", -err);
/* Let any pending signals fire now. This ensures
* that they won't be delivered after the exec, when
* they are definitely not expected.
*/
unblock_signals();
/* Reboot */
if(ret){
printf("\n");
execvp(new_argv[0], new_argv);
perror("Failed to exec kernel");
ret = 1;
}
printf("\n");
return uml_exitcode;
}
#define CAN_KMALLOC() \
(kmalloc_ok && CHOOSE_MODE((os_getpid() != tracing_pid), 1))
extern void *__real_malloc(int);
void *__wrap_malloc(int size)
{
void *ret;
if(!CAN_KMALLOC())
return __real_malloc(size);
else if(size <= UM_KERN_PAGE_SIZE)
/* finding contiguous pages can be hard*/
ret = kmalloc(size, UM_GFP_KERNEL);
else ret = vmalloc(size);
/* glibc people insist that if malloc fails, errno should be
* set by malloc as well. So we do.
*/
if(ret == NULL)
errno = ENOMEM;
return ret;
}
void *__wrap_calloc(int n, int size)
{
void *ptr = __wrap_malloc(n * size);
if(ptr == NULL)
return NULL;
memset(ptr, 0, n * size);
return ptr;
}
extern void __real_free(void *);
extern unsigned long high_physmem;
void __wrap_free(void *ptr)
{
unsigned long addr = (unsigned long) ptr;
/* We need to know how the allocation happened, so it can be correctly
* freed. This is done by seeing what region of memory the pointer is
* in -
* physical memory - kmalloc/kfree
* kernel virtual memory - vmalloc/vfree
* anywhere else - malloc/free
* If kmalloc is not yet possible, then either high_physmem and/or
* end_vm are still 0 (as at startup), in which case we call free, or
* we have set them, but anyway addr has not been allocated from those
* areas. So, in both cases __real_free is called.
*
* CAN_KMALLOC is checked because it would be bad to free a buffer
* with kmalloc/vmalloc after they have been turned off during
* shutdown.
* XXX: However, we sometimes shutdown CAN_KMALLOC temporarily, so
* there is a possibility for memory leaks.
*/
if((addr >= uml_physmem) && (addr < high_physmem)){
if(CAN_KMALLOC())
kfree(ptr);
}
else if((addr >= start_vm) && (addr < end_vm)){
if(CAN_KMALLOC())
vfree(ptr);
}
else __real_free(ptr);
}
