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[kvm-unit-tests,2/4] arm64: start_usr: no default vectors

Message ID 1452879690-14493-3-git-send-email-drjones@redhat.com (mailing list archive)
State New, archived
Headers show

Commit Message

Andrew Jones Jan. 15, 2016, 5:41 p.m. UTC 
Don't install default vector handlers on the usermode stack, as
they'll override handlers installed on the kernel stack.

Signed-off-by: Andrew Jones <drjones@redhat.com>
---
 lib/arm64/processor.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)
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Patch

diff --git a/lib/arm64/processor.c b/lib/arm64/processor.c
index f0ce882527262..7f84fe3a09fb1 100644
--- a/lib/arm64/processor.c
+++ b/lib/arm64/processor.c
@@ -221,11 +221,16 @@  void install_vector_handler(enum vector v, vector_fn fn)
 		ti->vector_handlers[v] = fn;
 }
 
-void thread_info_init(struct thread_info *ti, unsigned int flags)
+static void __thread_info_init(struct thread_info *ti, unsigned int flags)
 {
 	memset(ti, 0, sizeof(struct thread_info));
 	ti->cpu = mpidr_to_cpu(get_mpidr());
 	ti->flags = flags;
+}
+
+void thread_info_init(struct thread_info *ti, unsigned int flags)
+{
+	__thread_info_init(ti, flags);
 	vector_handlers_default_init(ti->vector_handlers);
 }
 
@@ -233,7 +238,7 @@  void start_usr(void (*func)(void *arg), void *arg, unsigned long sp_usr)
 {
 	sp_usr &= (~15UL); /* stack ptr needs 16-byte alignment */
 
-	thread_info_init(thread_info_sp(sp_usr), TIF_USER_MODE);
+	__thread_info_init(thread_info_sp(sp_usr), TIF_USER_MODE);
 
 	asm volatile(
 		"mov	x0, %0\n"