linux/crisv10/arch_sigreturn.c

long regs[PT_MAX + 1];

if (ptrace(PTRACE_GETREGS, tcp->pid, NULL, (long)regs) < 0) {
	perror_msg("sigreturn: PTRACE_GETREGS");
	return 0;
}
const long addr = regs[PT_USP] + offsetof(struct sigcontext, oldmask);

tprints("{mask=");
print_sigset_addr_len(tcp, addr, NSIG / 8);
tprints("}");