void tcont(void)
{
tsignal();
treset(g_old_term, 1);
tresize(0, 0);
free(g_old_term);
g_old_term = NULL;
}
void
dtrace_return_probe(struct regs *rp)
{
krwlock_t *rwp;
uintptr_t npc = curthread->t_dtrace_npc;
uint8_t step = curthread->t_dtrace_step;
uint8_t ret = curthread->t_dtrace_ret;
if (curthread->t_dtrace_ast) {
aston(curthread);
curthread->t_sig_check = 1;
}
/*
* Clear all user tracing flags.
*/
curthread->t_dtrace_ft = 0;
/*
* If we weren't expecting to take a return probe trap, kill the
* process as though it had just executed an unassigned trap
* instruction.
*/
if (step == 0) {
tsignal(curthread, SIGILL);
return;
}
ASSERT(rp->r_npc == rp->r_pc + 4);
/*
* If we hit this trap unrelated to a return probe, we're just here
* to reset the AST flag since we deferred a signal until after we
* logically single-stepped the instruction we copied out.
*/
if (ret == 0) {
rp->r_pc = npc;
rp->r_npc = npc + 4;
return;
}
/*
* We need to wait until after we've called the dtrace_return_probe_ptr
* function pointer to set %pc and %npc.
*/
rwp = &CPU->cpu_ft_lock;
rw_enter(rwp, RW_READER);
if (dtrace_return_probe_ptr != NULL)
(void) (*dtrace_return_probe_ptr)(rp);
rw_exit(rwp);
rp->r_pc = npc;
rp->r_npc = npc + 4;
}
/*
* nonexistent system call-- signal lwp (may want to handle it)
* flag error if lwp won't see signal immediately
*/
int64_t
nosys()
{
tsignal(curthread, SIGSYS);
return (set_errno(ENOSYS));
}
