diff options
| -rw-r--r-- | tools/testing/selftests/x86/entry_from_vm86.c | 73 |
1 files changed, 72 insertions, 1 deletions
diff --git a/tools/testing/selftests/x86/entry_from_vm86.c b/tools/testing/selftests/x86/entry_from_vm86.c index d075ea0e5ca1..f7d9ceac7e06 100644 --- a/tools/testing/selftests/x86/entry_from_vm86.c +++ b/tools/testing/selftests/x86/entry_from_vm86.c @@ -95,6 +95,22 @@ asm ( "int3\n\t" "vmcode_int80:\n\t" "int $0x80\n\t" + "vmcode_umip:\n\t" + /* addressing via displacements */ + "smsw (2052)\n\t" + "sidt (2054)\n\t" + "sgdt (2060)\n\t" + /* addressing via registers */ + "mov $2066, %bx\n\t" + "smsw (%bx)\n\t" + "mov $2068, %bx\n\t" + "sidt (%bx)\n\t" + "mov $2074, %bx\n\t" + "sgdt (%bx)\n\t" + /* register operands, only for smsw */ + "smsw %ax\n\t" + "mov %ax, (2080)\n\t" + "int3\n\t" ".size vmcode, . - vmcode\n\t" "end_vmcode:\n\t" ".code32\n\t" @@ -103,7 +119,7 @@ asm ( extern unsigned char vmcode[], end_vmcode[]; extern unsigned char vmcode_bound[], vmcode_sysenter[], vmcode_syscall[], - vmcode_sti[], vmcode_int3[], vmcode_int80[]; + vmcode_sti[], vmcode_int3[], vmcode_int80[], vmcode_umip[]; /* Returns false if the test was skipped. */ static bool do_test(struct vm86plus_struct *v86, unsigned long eip, @@ -160,6 +176,58 @@ static bool do_test(struct vm86plus_struct *v86, unsigned long eip, return true; } +void do_umip_tests(struct vm86plus_struct *vm86, unsigned char *test_mem) +{ + struct table_desc { + unsigned short limit; + unsigned long base; + } __attribute__((packed)); + + /* Initialize variables with arbitrary values */ + struct table_desc gdt1 = { .base = 0x3c3c3c3c, .limit = 0x9999 }; + struct table_desc gdt2 = { .base = 0x1a1a1a1a, .limit = 0xaeae }; + struct table_desc idt1 = { .base = 0x7b7b7b7b, .limit = 0xf1f1 }; + struct table_desc idt2 = { .base = 0x89898989, .limit = 0x1313 }; + unsigned short msw1 = 0x1414, msw2 = 0x2525, msw3 = 3737; + + /* UMIP -- exit with INT3 unless kernel emulation did not trap #GP */ + do_test(vm86, vmcode_umip - vmcode, VM86_TRAP, 3, "UMIP tests"); + + /* Results from displacement-only addressing */ + msw1 = *(unsigned short *)(test_mem + 2052); + memcpy(&idt1, test_mem + 2054, sizeof(idt1)); + memcpy(&gdt1, test_mem + 2060, sizeof(gdt1)); + + /* Results from register-indirect addressing */ + msw2 = *(unsigned short *)(test_mem + 2066); + memcpy(&idt2, test_mem + 2068, sizeof(idt2)); + memcpy(&gdt2, test_mem + 2074, sizeof(gdt2)); + + /* Results when using register operands */ + msw3 = *(unsigned short *)(test_mem + 2080); + + printf("[INFO]\tResult from SMSW:[0x%04x]\n", msw1); + printf("[INFO]\tResult from SIDT: limit[0x%04x]base[0x%08lx]\n", + idt1.limit, idt1.base); + printf("[INFO]\tResult from SGDT: limit[0x%04x]base[0x%08lx]\n", + gdt1.limit, gdt1.base); + + if (msw1 != msw2 || msw1 != msw3) + printf("[FAIL]\tAll the results of SMSW should be the same.\n"); + else + printf("[PASS]\tAll the results from SMSW are identical.\n"); + + if (memcmp(&gdt1, &gdt2, sizeof(gdt1))) + printf("[FAIL]\tAll the results of SGDT should be the same.\n"); + else + printf("[PASS]\tAll the results from SGDT are identical.\n"); + + if (memcmp(&idt1, &idt2, sizeof(idt1))) + printf("[FAIL]\tAll the results of SIDT should be the same.\n"); + else + printf("[PASS]\tAll the results from SIDT are identical.\n"); +} + int main(void) { struct vm86plus_struct v86; @@ -218,6 +286,9 @@ int main(void) v86.regs.eax = (unsigned int)-1; do_test(&v86, vmcode_int80 - vmcode, VM86_INTx, 0x80, "int80"); + /* UMIP -- should exit with INTx 0x80 unless UMIP was not disabled */ + do_umip_tests(&v86, addr); + /* Execute a null pointer */ v86.regs.cs = 0; v86.regs.ss = 0; |