diff options
Diffstat (limited to 'tools/testing/selftests/x86/iopl.c')
-rw-r--r-- | tools/testing/selftests/x86/iopl.c | 78 |
1 files changed, 58 insertions, 20 deletions
diff --git a/tools/testing/selftests/x86/iopl.c b/tools/testing/selftests/x86/iopl.c index bab2f6e06b63..7e3e09c1abac 100644 --- a/tools/testing/selftests/x86/iopl.c +++ b/tools/testing/selftests/x86/iopl.c @@ -85,48 +85,88 @@ static void expect_gp_outb(unsigned short port) printf("[OK]\toutb to 0x%02hx failed\n", port); } -static bool try_cli(void) +#define RET_FAULTED 0 +#define RET_FAIL 1 +#define RET_EMUL 2 + +static int try_cli(void) { + unsigned long flags; + sethandler(SIGSEGV, sigsegv, SA_RESETHAND); if (sigsetjmp(jmpbuf, 1) != 0) { - return false; + return RET_FAULTED; } else { - asm volatile ("cli"); - return true; + asm volatile("cli; pushf; pop %[flags]" + : [flags] "=rm" (flags)); + + /* X86_FLAGS_IF */ + if (!(flags & (1 << 9))) + return RET_FAIL; + else + return RET_EMUL; } clearhandler(SIGSEGV); } -static bool try_sti(void) +static int try_sti(bool irqs_off) { + unsigned long flags; + sethandler(SIGSEGV, sigsegv, SA_RESETHAND); if (sigsetjmp(jmpbuf, 1) != 0) { - return false; + return RET_FAULTED; } else { - asm volatile ("sti"); - return true; + asm volatile("sti; pushf; pop %[flags]" + : [flags] "=rm" (flags)); + + /* X86_FLAGS_IF */ + if (irqs_off && (flags & (1 << 9))) + return RET_FAIL; + else + return RET_EMUL; } clearhandler(SIGSEGV); } -static void expect_gp_sti(void) +static void expect_gp_sti(bool irqs_off) { - if (try_sti()) { + int ret = try_sti(irqs_off); + + switch (ret) { + case RET_FAULTED: + printf("[OK]\tSTI faulted\n"); + break; + case RET_EMUL: + printf("[OK]\tSTI NOPped\n"); + break; + default: printf("[FAIL]\tSTI worked\n"); nerrs++; - } else { - printf("[OK]\tSTI faulted\n"); } } -static void expect_gp_cli(void) +/* + * Returns whether it managed to disable interrupts. + */ +static bool test_cli(void) { - if (try_cli()) { + int ret = try_cli(); + + switch (ret) { + case RET_FAULTED: + printf("[OK]\tCLI faulted\n"); + break; + case RET_EMUL: + printf("[OK]\tCLI NOPped\n"); + break; + default: printf("[FAIL]\tCLI worked\n"); nerrs++; - } else { - printf("[OK]\tCLI faulted\n"); + return true; } + + return false; } int main(void) @@ -152,8 +192,7 @@ int main(void) } /* Make sure that CLI/STI are blocked even with IOPL level 3 */ - expect_gp_cli(); - expect_gp_sti(); + expect_gp_sti(test_cli()); expect_ok_outb(0x80); /* Establish an I/O bitmap to test the restore */ @@ -204,8 +243,7 @@ int main(void) printf("[RUN]\tparent: write to 0x80 (should fail)\n"); expect_gp_outb(0x80); - expect_gp_cli(); - expect_gp_sti(); + expect_gp_sti(test_cli()); /* Test the capability checks. */ printf("\tiopl(3)\n"); |