mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
254 lines
5.8 KiB
254 lines
5.8 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
|
* Copyright (C) 2015 Thomas Meyer ([email protected]) |
|
* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
|
*/ |
|
|
|
#include <stdio.h> |
|
#include <stdlib.h> |
|
#include <unistd.h> |
|
#include <errno.h> |
|
#include <signal.h> |
|
#include <string.h> |
|
#include <sys/resource.h> |
|
#include <as-layout.h> |
|
#include <init.h> |
|
#include <kern_util.h> |
|
#include <os.h> |
|
#include <um_malloc.h> |
|
|
|
#define PGD_BOUND (4 * 1024 * 1024) |
|
#define STACKSIZE (8 * 1024 * 1024) |
|
#define THREAD_NAME_LEN (256) |
|
|
|
long elf_aux_hwcap; |
|
|
|
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 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) { |
|
os_warn("failed to install handler for signal %d " |
|
"- errno = %d\n", sig, errno); |
|
exit(1); |
|
} |
|
} |
|
|
|
#define UML_LIB_PATH ":" OS_LIB_PATH "/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) { |
|
if (putenv("PATH=:/bin:/usr/bin/" UML_LIB_PATH)) |
|
perror("couldn't putenv"); |
|
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("couldn't malloc to set a new PATH"); |
|
return; |
|
} |
|
snprintf(new_path, path_len, "PATH=%s" UML_LIB_PATH, old_path); |
|
if (putenv(new_path)) { |
|
perror("couldn't putenv to set a new PATH"); |
|
free(new_path); |
|
} |
|
} |
|
|
|
extern void scan_elf_aux( char **envp); |
|
|
|
int __init main(int argc, char **argv, char **envp) |
|
{ |
|
char **new_argv; |
|
int ret, i, err; |
|
|
|
set_stklim(); |
|
|
|
setup_env_path(); |
|
|
|
setsid(); |
|
|
|
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); |
|
|
|
#ifdef CONFIG_ARCH_REUSE_HOST_VSYSCALL_AREA |
|
scan_elf_aux(envp); |
|
#endif |
|
|
|
change_sig(SIGPIPE, 0); |
|
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 timer signal 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 timer signal to be ignored */ |
|
os_timer_disable(); |
|
|
|
/* disable SIGIO for the fds and set SIGIO to be ignored */ |
|
err = deactivate_all_fds(); |
|
if (err) |
|
os_warn("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(); |
|
|
|
os_info("\n"); |
|
/* Reboot */ |
|
if (ret) { |
|
execvp(new_argv[0], new_argv); |
|
perror("Failed to exec kernel"); |
|
ret = 1; |
|
} |
|
return uml_exitcode; |
|
} |
|
|
|
extern void *__real_malloc(int); |
|
|
|
void *__wrap_malloc(int size) |
|
{ |
|
void *ret; |
|
|
|
if (!kmalloc_ok) |
|
return __real_malloc(size); |
|
else if (size <= UM_KERN_PAGE_SIZE) |
|
/* finding contiguous pages can be hard*/ |
|
ret = uml_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 (kmalloc_ok) |
|
kfree(ptr); |
|
} |
|
else if ((addr >= start_vm) && (addr < end_vm)) { |
|
if (kmalloc_ok) |
|
vfree(ptr); |
|
} |
|
else __real_free(ptr); |
|
}
|
|
|