145 lines
3.2 KiB
C
145 lines
3.2 KiB
C
/*
|
|
* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
|
|
* Licensed under the GPL
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <errno.h>
|
|
#include <signal.h>
|
|
#include <string.h>
|
|
#include <termios.h>
|
|
#include <wait.h>
|
|
#include <sys/mman.h>
|
|
#include <sys/utsname.h>
|
|
#include <os.h>
|
|
|
|
void stack_protections(unsigned long address)
|
|
{
|
|
if (mprotect((void *) address, UM_THREAD_SIZE,
|
|
PROT_READ | PROT_WRITE | PROT_EXEC) < 0)
|
|
panic("protecting stack failed, errno = %d", errno);
|
|
}
|
|
|
|
int raw(int fd)
|
|
{
|
|
struct termios tt;
|
|
int err;
|
|
|
|
CATCH_EINTR(err = tcgetattr(fd, &tt));
|
|
if (err < 0)
|
|
return -errno;
|
|
|
|
cfmakeraw(&tt);
|
|
|
|
CATCH_EINTR(err = tcsetattr(fd, TCSADRAIN, &tt));
|
|
if (err < 0)
|
|
return -errno;
|
|
|
|
/*
|
|
* XXX tcsetattr could have applied only some changes
|
|
* (and cfmakeraw() is a set of changes)
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
void setup_machinename(char *machine_out)
|
|
{
|
|
struct utsname host;
|
|
|
|
uname(&host);
|
|
#ifdef UML_CONFIG_UML_X86
|
|
# ifndef UML_CONFIG_64BIT
|
|
if (!strcmp(host.machine, "x86_64")) {
|
|
strcpy(machine_out, "i686");
|
|
return;
|
|
}
|
|
# else
|
|
if (!strcmp(host.machine, "i686")) {
|
|
strcpy(machine_out, "x86_64");
|
|
return;
|
|
}
|
|
# endif
|
|
#endif
|
|
strcpy(machine_out, host.machine);
|
|
}
|
|
|
|
void setup_hostinfo(char *buf, int len)
|
|
{
|
|
struct utsname host;
|
|
|
|
uname(&host);
|
|
snprintf(buf, len, "%s %s %s %s %s", host.sysname, host.nodename,
|
|
host.release, host.version, host.machine);
|
|
}
|
|
|
|
/*
|
|
* We cannot use glibc's abort(). It makes use of tgkill() which
|
|
* has no effect within UML's kernel threads.
|
|
* After that glibc would execute an invalid instruction to kill
|
|
* the calling process and UML crashes with SIGSEGV.
|
|
*/
|
|
static inline void __attribute__ ((noreturn)) uml_abort(void)
|
|
{
|
|
sigset_t sig;
|
|
|
|
fflush(NULL);
|
|
|
|
if (!sigemptyset(&sig) && !sigaddset(&sig, SIGABRT))
|
|
sigprocmask(SIG_UNBLOCK, &sig, 0);
|
|
|
|
for (;;)
|
|
if (kill(getpid(), SIGABRT) < 0)
|
|
exit(127);
|
|
}
|
|
|
|
void os_dump_core(void)
|
|
{
|
|
int pid;
|
|
|
|
signal(SIGSEGV, SIG_DFL);
|
|
|
|
/*
|
|
* We are about to SIGTERM this entire process group to ensure that
|
|
* nothing is around to run after the kernel exits. The
|
|
* kernel wants to abort, not die through SIGTERM, so we
|
|
* ignore it here.
|
|
*/
|
|
|
|
signal(SIGTERM, SIG_IGN);
|
|
kill(0, SIGTERM);
|
|
/*
|
|
* Most of the other processes associated with this UML are
|
|
* likely sTopped, so give them a SIGCONT so they see the
|
|
* SIGTERM.
|
|
*/
|
|
kill(0, SIGCONT);
|
|
|
|
/*
|
|
* Now, having sent signals to everyone but us, make sure they
|
|
* die by ptrace. Processes can survive what's been done to
|
|
* them so far - the mechanism I understand is receiving a
|
|
* SIGSEGV and segfaulting immediately upon return. There is
|
|
* always a SIGSEGV pending, and (I'm guessing) signals are
|
|
* processed in numeric order so the SIGTERM (signal 15 vs
|
|
* SIGSEGV being signal 11) is never handled.
|
|
*
|
|
* Run a waitpid loop until we get some kind of error.
|
|
* Hopefully, it's ECHILD, but there's not a lot we can do if
|
|
* it's something else. Tell os_kill_ptraced_process not to
|
|
* wait for the child to report its death because there's
|
|
* nothing reasonable to do if that fails.
|
|
*/
|
|
|
|
while ((pid = waitpid(-1, NULL, WNOHANG | __WALL)) > 0)
|
|
os_kill_ptraced_process(pid, 0);
|
|
|
|
uml_abort();
|
|
}
|
|
|
|
void um_early_printk(const char *s, unsigned int n)
|
|
{
|
|
printf("%.*s", n, s);
|
|
}
|