[PATCH 3/3] selftests/x86: Add syscall_nt selftest

From: Andy Lutomirski
Date: Mon Aug 17 2015 - 15:23:08 EST


I've had this sitting around for a while. Add it to the selftests
tree. Far Cry running under Wine depends on this behavior.

Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxx>
---
tools/testing/selftests/x86/Makefile | 2 +-
tools/testing/selftests/x86/syscall_nt.c | 54 ++++++++++++++++++++++++++++++++
2 files changed, 55 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/x86/syscall_nt.c

diff --git a/tools/testing/selftests/x86/Makefile b/tools/testing/selftests/x86/Makefile
index 1cda40be06ca..2221f2ba449d 100644
--- a/tools/testing/selftests/x86/Makefile
+++ b/tools/testing/selftests/x86/Makefile
@@ -4,7 +4,7 @@ include ../lib.mk

.PHONY: all all_32 all_64 warn_32bit_failure clean

-TARGETS_C_BOTHBITS := single_step_syscall sysret_ss_attrs
+TARGETS_C_BOTHBITS := single_step_syscall sysret_ss_attrs syscall_nt
TARGETS_C_32BIT_ONLY := entry_from_vm86 sigreturn

TARGETS_C_32BIT_ALL := $(TARGETS_C_BOTHBITS) $(TARGETS_C_32BIT_ONLY)
diff --git a/tools/testing/selftests/x86/syscall_nt.c b/tools/testing/selftests/x86/syscall_nt.c
new file mode 100644
index 000000000000..60c06af4646a
--- /dev/null
+++ b/tools/testing/selftests/x86/syscall_nt.c
@@ -0,0 +1,54 @@
+/*
+ * syscall_nt.c - checks syscalls with NT set
+ * Copyright (c) 2014-2015 Andrew Lutomirski
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * Some obscure user-space code requires the ability to make system calls
+ * with FLAGS.NT set. Make sure it works.
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/syscall.h>
+#include <asm/processor-flags.h>
+
+#ifdef __x86_64__
+# define WIDTH "q"
+#else
+# define WIDTH "l"
+#endif
+
+static unsigned long get_eflags(void)
+{
+ unsigned long eflags;
+ asm volatile ("pushf" WIDTH "\n\tpop" WIDTH " %0" : "=rm" (eflags));
+ return eflags;
+}
+
+static void set_eflags(unsigned long eflags)
+{
+ asm volatile ("push" WIDTH " %0\n\tpopf" WIDTH
+ : : "rm" (eflags) : "flags");
+}
+
+int main()
+{
+ printf("[RUN]\tSet NT and issue a syscall\n");
+ set_eflags(get_eflags() | X86_EFLAGS_NT);
+ syscall(SYS_getpid);
+ if (get_eflags() & X86_EFLAGS_NT) {
+ printf("[OK]\tThe syscall worked and NT is still set\n");
+ return 0;
+ } else {
+ printf("[FAIL]\tThe syscall worked but NT was cleared\n");
+ return 1;
+ }
+}
--
2.4.3

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