void userspace(union uml_pt_regs *regs)
{
int err, status, op, pid = userspace_pid[0];
int local_using_sysemu; /*To prevent races if using_sysemu changes under us.*/
while(1){
restore_registers(pid, regs);
/* Now we set local_using_sysemu to be used for one loop */
local_using_sysemu = get_using_sysemu();
op = SELECT_PTRACE_OPERATION(local_using_sysemu, singlestepping(NULL));
err = ptrace(op, pid, 0, 0);
if(err)
panic("userspace - could not resume userspace process, "
"pid=%d, ptrace operation = %d, errno = %d\n",
op, errno);
CATCH_EINTR(err = waitpid(pid, &status, WUNTRACED));
if(err < 0)
panic("userspace - waitpid failed, errno = %d\n",
errno);
regs->skas.is_user = 1;
save_registers(pid, regs);
UPT_SYSCALL_NR(regs) = -1; /* Assume: It's not a syscall */
if(WIFSTOPPED(status)){
switch(WSTOPSIG(status)){
case SIGSEGV:
handle_segv(pid, regs);
break;
case SIGTRAP + 0x80:
handle_trap(pid, regs, local_using_sysemu);
break;
case SIGTRAP:
relay_signal(SIGTRAP, regs);
break;
case SIGIO:
case SIGVTALRM:
case SIGILL:
case SIGBUS:
case SIGFPE:
case SIGWINCH:
user_signal(WSTOPSIG(status), regs, pid);
break;
default:
printk("userspace - child stopped with signal "
"%d\n", WSTOPSIG(status));
}
interrupt_end();
/* Avoid -ERESTARTSYS handling in host */
PT_SYSCALL_NR(regs->skas.regs) = -1;
}
}
}
void userspace(union uml_pt_regs *regs)
{
int err, status, op, pid = userspace_pid[0];
restore_registers(regs);
err = ptrace(PTRACE_SYSCALL, pid, 0, 0);
if(err)
panic("userspace - PTRACE_SYSCALL failed, errno = %d\n",
errno);
while(1){
CATCH_EINTR(err = waitpid(pid, &status, WUNTRACED));
if(err < 0)
panic("userspace - waitpid failed, errno = %d\n",
errno);
regs->skas.is_user = 1;
save_registers(regs);
if(WIFSTOPPED(status)){
switch(WSTOPSIG(status)){
case SIGSEGV:
handle_segv(pid);
break;
case SIGTRAP:
handle_trap(pid, regs);
break;
case SIGIO:
case SIGVTALRM:
case SIGILL:
case SIGBUS:
case SIGFPE:
case SIGWINCH:
user_signal(WSTOPSIG(status), regs);
break;
default:
printk("userspace - child stopped with signal "
"%d\n", WSTOPSIG(status));
}
interrupt_end();
}
restore_registers(regs);
op = singlestepping_skas() ? PTRACE_SINGLESTEP :
PTRACE_SYSCALL;
err = ptrace(op, pid, 0, 0);
if(err)
panic("userspace - PTRACE_SYSCALL failed, "
"errno = %d\n", errno);
}
}
void userspace(union uml_pt_regs *regs)
{
int err, status, op, pt_syscall_parm, pid = userspace_pid[0];
int local_using_sysemu; /*To prevent races if using_sysemu changes under us.*/
restore_registers(regs);
local_using_sysemu = get_using_sysemu();
pt_syscall_parm = local_using_sysemu ? PTRACE_SYSEMU : PTRACE_SYSCALL;
err = ptrace(pt_syscall_parm, pid, 0, 0);
if(err)
panic("userspace - PTRACE_%s failed, errno = %d\n",
local_using_sysemu ? "SYSEMU" : "SYSCALL", errno);
while(1){
CATCH_EINTR(err = waitpid(pid, &status, WUNTRACED));
if(err < 0)
panic("userspace - waitpid failed, errno = %d\n",
errno);
regs->skas.is_user = 1;
save_registers(regs);
if(WIFSTOPPED(status)){
switch(WSTOPSIG(status)){
case SIGSEGV:
handle_segv(pid);
break;
case SIGTRAP:
handle_trap(pid, regs, local_using_sysemu);
break;
case SIGIO:
case SIGVTALRM:
case SIGILL:
case SIGBUS:
case SIGFPE:
case SIGWINCH:
user_signal(WSTOPSIG(status), regs);
break;
default:
printk("userspace - child stopped with signal "
"%d\n", WSTOPSIG(status));
}
interrupt_end();
}
restore_registers(regs);
/*Now we ended the syscall, so re-read local_using_sysemu.*/
local_using_sysemu = get_using_sysemu();
pt_syscall_parm = local_using_sysemu ? PTRACE_SYSEMU : PTRACE_SYSCALL;
op = singlestepping(NULL) ? PTRACE_SINGLESTEP :
pt_syscall_parm;
err = ptrace(op, pid, 0, 0);
if(err)
panic("userspace - PTRACE_%s failed, "
"errno = %d\n",
local_using_sysemu ? "SYSEMU" : "SYSCALL", errno);
}
}
long syscall_emu(long call, long arg1, long arg2, long arg3,
long arg4, long arg5, long arg6)
{
long ret;
switch (call)
{
case __NR_brk:
case __NR_mmap2:
case __NR_mmap:
case __NR_mremap:
case __NR_mprotect:
case __NR_madvise:
case __NR_sigaltstack:
case __NR_signal:
case __NR_sigaction:
case __NR_sigreturn:
case __NR_rt_sigaction:
case __NR_rt_sigreturn:
case __NR_fork:
case __NR_vfork:
case __NR_clone:
case __NR_exit:
case __NR_execve:
case __NR_exit_group:
break;
case __NR_read:
case __NR_readv:
case __NR_open:
case __NR_creat:
case __NR_dup:
case __NR_dup2:
case __NR_openat:
case __NR_pipe:
case __NR_socketcall:
ret = syscall_intr(call,arg1,arg2,arg3,arg4,arg5,arg6);
if ( taint_flag == TAINT_ON )
do_taint(ret,call,arg1,arg2,arg3,arg4,arg5,arg6);
return ret;
case __NR_ipc:
if ( arg1 == SHMAT )
break;
/* fall through */
default:
return syscall_intr(call,arg1,arg2,arg3,arg4,arg5,arg6);
}
ret = call;
if (!try_block_signals())
return ret; /* we have a signal in progress, revert to pre-syscall state */
switch (call)
{
/* these calls are all non-blocking right?
* blocked signals during blocking calls is a bad thing
*/
case __NR_brk:
ret = user_brk(arg1);
break;
case __NR_mmap2:
ret = user_mmap2(arg1,arg2,arg3,arg4,arg5,arg6);
break;
case __NR_mmap:
ret = user_old_mmap((struct kernel_mmap_args *)arg1);
break;
case __NR_mremap:
ret = user_mremap(arg1,arg2,arg3,arg4,arg5);
break;
case __NR_mprotect:
ret = user_mprotect(arg1,arg2,arg3);
break;
case __NR_madvise:
ret = user_madvise(arg1,arg2,arg3);
break;
case __NR_ipc:
if (arg1 == SHMAT)
ret = user_shmat(arg2,(char *)arg5,arg3,(unsigned long *)arg4);
else
die("should not have caught IPC call: %d", arg1);
break;
case __NR_sigaltstack:
ret = user_sigaltstack((stack_t *)arg1, (stack_t *)arg2);
break;
case __NR_signal:
{
ret = (long)user_signal(arg1, (kernel_sighandler_t)arg2);
break;
}
case __NR_sigaction:
ret = user_sigaction(arg1, (struct kernel_old_sigaction *)arg2,
(struct kernel_old_sigaction *)arg3);
break;
case __NR_rt_sigaction:
ret = user_rt_sigaction(arg1, (struct kernel_sigaction *)arg2,
(struct kernel_sigaction *)arg3, arg4);
break;
case __NR_sigreturn:
user_sigreturn();
break;
case __NR_rt_sigreturn:
user_rt_sigreturn();
break;
case __NR_vfork:
ret = user_clone(SIGCHLD, 0, NULL, NULL, NULL);
// ret = user_clone(CLONE_VFORK | CLONE_VM | SIGCHLD, 0, NULL, NULL, NULL);
break;
case __NR_fork:
ret = user_clone(SIGCHLD, 0, NULL, NULL, NULL);
break;
case __NR_clone:
ret = user_clone(arg1, arg2, (void *)arg3, (void *)arg4, (void*)arg5);
break;
case __NR_exit:
user_exit(arg1);
break;
case __NR_execve:
ret = user_execve((char *)arg1, (char **)arg2, (char **)arg3);
break;
case __NR_exit_group:
if (dump_on_exit)
{
long regs[] = { call, arg2, arg3, arg1, get_thread_ctx()->user_esp, arg6, arg4, arg5 };
do_taint_dump(regs);
}
sys_exit_group(arg1);
default:
die("unimplemented syscall");
break;
}
unblock_signals();
return ret;
}
