/*
* We give a *copy* of the faultinfo in the regs to segv.
* This must be done, since nesting SEGVs could overwrite
* the info in the regs. A pointer to the info then would
* give us bad data!
*/
unsigned long segv(struct faultinfo fi, unsigned long ip, int is_user, void *sc)
{
struct siginfo si;
void *catcher;
int err;
int is_write = FAULT_WRITE(fi);
unsigned long address = FAULT_ADDRESS(fi);
if(!is_user && (address >= start_vm) && (address < end_vm)){
flush_tlb_kernel_vm();
return(0);
}
else if(current->mm == NULL)
panic("Segfault with no mm");
if (SEGV_IS_FIXABLE(&fi) || SEGV_MAYBE_FIXABLE(&fi))
err = handle_page_fault(address, ip, is_write, is_user, &si.si_code);
else {
err = -EFAULT;
/* A thread accessed NULL, we get a fault, but CR2 is invalid.
* This code is used in __do_copy_from_user() of TT mode. */
address = 0;
}
catcher = current->thread.fault_catcher;
if(!err)
return(0);
else if(catcher != NULL){
current->thread.fault_addr = (void *) address;
do_longjmp(catcher, 1);
}
else if(current->thread.fault_addr != NULL)
panic("fault_addr set but no fault catcher");
else if(!is_user && arch_fixup(ip, sc))
return(0);
if(!is_user)
panic("Kernel mode fault at addr 0x%lx, ip 0x%lx",
address, ip);
if (err == -EACCES) {
si.si_signo = SIGBUS;
si.si_errno = 0;
si.si_code = BUS_ADRERR;
si.si_addr = (void __user *)address;
current->thread.arch.faultinfo = fi;
force_sig_info(SIGBUS, &si, current);
} else if (err == -ENOMEM) {
printk("VM: killing process %s\n", current->comm);
do_exit(SIGKILL);
} else {
BUG_ON(err != -EFAULT);
si.si_signo = SIGSEGV;
si.si_addr = (void __user *) address;
current->thread.arch.faultinfo = fi;
force_sig_info(SIGSEGV, &si, current);
}
return(0);
}
int um_execve(char *file, char **argv, char **env)
{
int err;
err = execve1(file, argv, env);
if(!err)
do_longjmp(current->thread.exec_buf, 1);
return(err);
}
int
main(int argc, char *argv[])
{
printf("main()\n");
do_setjmp();
another_function();
do_longjmp();
printf("exiting main()\n");
exit(EXIT_SUCCESS);
}
int main(int argc, char** argv)
{
#if defined(__amd64__) || defined(__x86_64__)
printf("x86_64 sizeof(long int)=%d, sizeof(long)=%d, "
"sizeof(int)=%d, __WORDSIZE=%d, __GLIBC__=%d, __GLIBC_MINOR__=%d\n",
(int)sizeof(long int), (int)sizeof(long), (int)sizeof(int),
(int)__WORDSIZE, (int)__GLIBC__, (int)__GLIBC_MINOR__);
#else
printf("arm sizeof(long int)=%d, sizeof(long)=%d, "
"sizeof(int)=%d, __GLIBC__=%d,__GLIBC_MINOR__=%d\n",
(int)sizeof(long int), (int)sizeof(long), (int)sizeof(int),
(int)__GLIBC__, (int)__GLIBC_MINOR__);
#endif
do_longjmp();
printf("terminated\n");
return 0;
}
void bus_handler(int sig, union uml_pt_regs *regs)
{
if(current->thread.fault_catcher != NULL)
do_longjmp(current->thread.fault_catcher, 1);
else relay_signal(sig, regs);
}
