1 // SPDX-License-Identifier: GPL-2.0-only
3  * entry_from_vm86.c - tests kernel entries from vm86 mode
4  * Copyright (c) 2014-2015 Andrew Lutomirski
6  * This exercises a few paths that need to special-case vm86 mode.
58 	if (ctx->uc_mcontext.gregs[REG_EFL] & X86_EFLAGS_VM ||  in sighandler()
59 	    (ctx->uc_mcontext.gregs[REG_CS] & 3) != 3) {  in sighandler()
73 	       (unsigned long)ctx->uc_mcontext.gregs[REG_EFL],  in sighandler()
74 	       (unsigned short)ctx->uc_mcontext.gregs[REG_CS]);  in sighandler()
122 	".size vmcode, . - vmcode\n\t"
141 	v86->regs.eip = eip;  in do_test()
144 	if (ret == -1 && (errno == ENOSYS || errno == EPERM)) {  in do_test()
177 	if (rettype == -1 ||  in do_test()
181 …L]\tIncorrect return reason (started at eip = 0x%lx, ended at eip = 0x%lx)\n", eip, v86->regs.eip);  in do_test()
202 	/* UMIP -- exit with INT3 unless kernel emulation did not trap #GP */  in do_umip_tests()
203 	do_test(vm86, vmcode_umip - vmcode, VM86_TRAP, 3, "UMIP tests");  in do_umip_tests()
205 	/* Results from displacement-only addressing */  in do_umip_tests()
210 	/* Results from register-indirect addressing */  in do_umip_tests()
227 		printf("[PASS]\tAll the results from SMSW are identical.\n");  in do_umip_tests()
232 		printf("[PASS]\tAll the results from SGDT are identical.\n");  in do_umip_tests()
237 		printf("[PASS]\tAll the results from SIDT are identical.\n");  in do_umip_tests()
240 	do_test(vm86, vmcode_umip_str - vmcode, VM86_SIGNAL, 0,  in do_umip_tests()
245 	do_test(vm86, vmcode_umip_sldt - vmcode, VM86_SIGNAL, 0,  in do_umip_tests()
255 				   MAP_ANONYMOUS | MAP_PRIVATE, -1,0);  in main()
259 	memcpy(addr, vmcode, end_vmcode - vmcode);  in main()
275 	/* #BR -- should deliver SIG??? */  in main()
276 	do_test(&v86, vmcode_bound - vmcode, VM86_INTx, 5, "#BR");  in main()
279 	 * SYSENTER -- should cause #GP or #UD depending on CPU.  in main()
280 	 * Expected return type -1 means that we shouldn't validate  in main()
281 	 * the vm86 return value.  This will avoid problems on non-SEP  in main()
285 	do_test(&v86, vmcode_sysenter - vmcode, -1, 0, "SYSENTER");  in main()
296 	do_test(&v86, vmcode_syscall - vmcode, VM86_SIGNAL, 0, "SYSCALL");  in main()
302 	do_test(&v86, vmcode_sti - vmcode, VM86_STI, 0, "STI with VIP set");  in main()
307 	do_test(&v86, vmcode_popf_hlt - vmcode, VM86_UNKNOWN, 0, "POPF with VIP set and IF clear");  in main()
312 	do_test(&v86, vmcode_popf_hlt - vmcode, VM86_STI, 0, "POPF with VIP and IF set");  in main()
317 	do_test(&v86, vmcode_popf_hlt - vmcode, VM86_UNKNOWN, 0, "POPF with VIP clear and IF set");  in main()
321 	/* INT3 -- should cause #BP */  in main()
322 	do_test(&v86, vmcode_int3 - vmcode, VM86_TRAP, 3, "INT3");  in main()
324 	/* INT80 -- should exit with "INTx 0x80" */  in main()
325 	v86.regs.eax = (unsigned int)-1;  in main()
326 	do_test(&v86, vmcode_int80 - vmcode, VM86_INTx, 0x80, "int80");  in main()
328 	/* UMIP -- should exit with INTx 0x80 unless UMIP was not disabled */  in main()