linux-kernel - [PATCH 4/6] selftests/x86/syscall

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Date:   Fri, 26 Jun 2020 10:21:14 -0700
From:   Andy Lutomirski <luto@...nel.org>
To:     x86@...nel.org
Cc:     linux-kernel@...r.kernel.org,
        Andrew Cooper <andrew.cooper3@...rix.com>,
        Juergen Gross <jgross@...e.com>,
        Andy Lutomirski <luto@...nel.org>
Subject: [PATCH 4/6] selftests/x86/syscall_nt: Add more flag combinations

Add EFLAGS.AC to the mix.

Signed-off-by: Andy Lutomirski <luto@...nel.org>
---
 tools/testing/selftests/x86/syscall_nt.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/tools/testing/selftests/x86/syscall_nt.c b/tools/testing/selftests/x86/syscall_nt.c
index 02309a195041..f060534b66a0 100644
--- a/tools/testing/selftests/x86/syscall_nt.c
+++ b/tools/testing/selftests/x86/syscall_nt.c
@@ -73,6 +73,12 @@ int main(void)
 	printf("[RUN]\tSet NT and issue a syscall\n");
 	do_it(X86_EFLAGS_NT);
 
+	printf("[RUN]\tSet AC and issue a syscall\n");
+	do_it(X86_EFLAGS_AC);
+
+	printf("[RUN]\tSet NT|AC and issue a syscall\n");
+	do_it(X86_EFLAGS_NT | X86_EFLAGS_AC);
+
 	/*
 	 * Now try it again with TF set -- TF forces returns via IRET in all
 	 * cases except non-ptregs-using 64-bit full fast path syscalls.
@@ -80,8 +86,17 @@ int main(void)
 
 	sethandler(SIGTRAP, sigtrap, 0);
 
+	printf("[RUN]\tSet TF and issue a syscall\n");
+	do_it(X86_EFLAGS_TF);
+
 	printf("[RUN]\tSet NT|TF and issue a syscall\n");
 	do_it(X86_EFLAGS_NT | X86_EFLAGS_TF);
 
+	printf("[RUN]\tSet AC|TF and issue a syscall\n");
+	do_it(X86_EFLAGS_AC | X86_EFLAGS_TF);
+
+	printf("[RUN]\tSet NT|AC|TF and issue a syscall\n");
+	do_it(X86_EFLAGS_NT | X86_EFLAGS_AC | X86_EFLAGS_TF);
+
 	return nerrs == 0 ? 0 : 1;
 }
-- 
2.25.4