linux/sh/get_syscall_args.c

static const int syscall_regs[MAX_ARGS] = {
	4 * (REG_REG0+4), 4 * (REG_REG0+5), 4 * (REG_REG0+6),
	4 * (REG_REG0+7), 4 * (REG_REG0  ), 4 * (REG_REG0+1)
};

unsigned int i;

for (i = 0; i < tcp->s_ent->nargs; ++i)
	if (upeek(tcp->pid, syscall_regs[i], &tcp->u_arg[i]) < 0)
		return -1;