sigonstack
oonstack = sigonstack(regs->tf_rsp);
mcp->mc_onstack = sigonstack(tp->tf_rsp);
mcp->mc_onstack = sigonstack(tp->tf_rsp);
oonstack = sigonstack(regs->tf_rsp);
oonstack = sigonstack(regs->tf_rsp);
oonstack = sigonstack(regs->tf_rsp);
oonstack = sigonstack(regs->tf_rsp);
oonstack = sigonstack(regs->tf_rsp);
oonstack = sigonstack(regs->tf_rsp);
onstack = sigonstack(tf->tf_usr_sp);
onstack = sigonstack(tf->tf_sp);
onstack = sigonstack(tf->tf_x[13]);
onstack = sigonstack(tf->tf_sp);
oss.ss_onstack = sigonstack(cpu_getstack(td));
mcp->mc_onstack = sigonstack(tp->tf_esp);
oonstack = sigonstack(regs->tf_esp);
oonstack = sigonstack(regs->tf_esp);
oonstack = sigonstack(regs->tf_esp);
oonstack = sigonstack(regs->tf_esp);
oonstack = sigonstack(regs->tf_esp);
oss.ss_onstack = sigonstack(cpu_getstack(td));
oonstack = sigonstack(cpu_getstack(td));
oonstack = sigonstack(sp);
oonstack = sigonstack(sp);
mcp->mc_onstack = sigonstack(td->td_frame->fixreg[1]);
mcp->mc_onstack = sigonstack(td->td_frame->fixreg[1]);
onstack = sigonstack(tf->tf_sp);
int sigonstack(size_t sp);