Pissyscall_prev
(void) Pissyscall_prev(Proc, pc, (uintptr_t *)&pc);
if (Pissyscall_prev(P, P->status.pr_lwp.pr_reg[R_PC],
syspri = Pissyscall_prev(P, P->status.pr_lwp.pr_reg[R_PC],
!Pissyscall_prev(P, P->status.pr_lwp.pr_reg[R_PC], NULL)))
if (!Pissyscall_prev(P, P->status.pr_lwp.pr_reg[R_PC], NULL)) {
extern int Pissyscall_prev(struct ps_prochandle *, uintptr_t, uintptr_t *);