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[v8,03/11] arm: traps: check if SMC was conditional before handling it

Message ID 1507650771-16631-4-git-send-email-volodymyr_babchuk@epam.com (mailing list archive)
State New, archived
Headers show

Commit Message

Volodymyr Babchuk Oct. 10, 2017, 3:52 p.m. UTC 
Trapped SMC instruction can fail condition check on ARMv8 architecture
(ARM DDI 0487B.a page D7-2271). So we need to check if condition was meet.

Signed-off-by: Volodymyr Babchuk <volodymyr_babchuk@epam.com>
Reviewed-by: Julien Grall <julien.grall@arm.com>
---
 xen/arch/arm/traps.c | 6 ++++++
 1 file changed, 6 insertions(+)
diff mbox

Patch

diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c
index ace5a43..5b91e6c 100644
--- a/xen/arch/arm/traps.c
+++ b/xen/arch/arm/traps.c
@@ -2199,6 +2199,12 @@  static void do_trap_smc(struct cpu_user_regs *regs, const union hsr hsr)
 {
     int rc = 0;
 
+    if ( !check_conditional_instr(regs, hsr) )
+    {
+        advance_pc(regs, hsr);
+        return;
+    }
+
     if ( current->domain->arch.monitor.privileged_call_enabled )
         rc = monitor_smc();