12 static unsigned long invalid_offset = 0xffffffffffffff;
19 	asm volatile (".byte 0xf3, 0x48, 0x0f, 0x1e, 0xc8" : "=a"(ssp));  in cet_shstk_func()
21 	asm("movq %%rbp,%0" : "=r"(ret_addr));  in cet_shstk_func()
22 	printf("The return-address in shadow-stack = 0x%lx, in normal stack = 0x%lx\n",  in cet_shstk_func()
27 	 * while function is returning. The error-code is 0x1, meaning it's  in cet_shstk_func()
32 	*(ret_addr + 1) = 0xdeaddead;  in cet_shstk_func()
34 	return 0;  in cet_shstk_func()
41 	 * endbr64, it'll trigger #CP with error code 0x3, and the execution  in cet_ibt_func()
51 	return 0;  in cet_ibt_func()
54 #define ENABLE_SHSTK_BIT 0x1
55 #define ENABLE_IBT_BIT   0x4
60 	printf("In #CP exception handler, error_code = 0x%lx\n",  in handle_cp()
63 	asm("jmpq *%0": :"m"(invalid_offset));  in handle_cp()
71 	pteval_t pte = 0;  in main()
74 	cp_count = 0;  in main()
94 	install_pte(current_page_table(), 1, shstk_virt, pte, 0);  in main()
95 	memset(shstk_virt, 0x0, PAGE_SIZE);  in main()
109 	wrmsr(MSR_IA32_PL3_SSP, (u64)(shstk_virt + 0x1000));  in main()
115 	run_in_user((usermode_func)cet_shstk_func, GP_VECTOR, 0, 0, 0, 0, &rvc);  in main()
117 	cp_count = 0;  in main()
122 	run_in_user((usermode_func)cet_ibt_func, GP_VECTOR, 0, 0, 0, 0, &rvc);  in main()
126 	wrmsr(MSR_IA32_U_CET, 0);  in main()