arch-arm: Add support for the brk instruction

Add support for software breakpoints as signalled by the aarch64 brk
instruction. This introduces a new SoftwareBreakpoint fault.

Change-Id: I93646c3298e09d7f7b0983108ba8937c7331297a
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Giacomo Gabrielli <giacomo.gabrielli@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/5721
Reviewed-by: Giacomo Gabrielli <Giacomo.Gabrielli@arm.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/src/arch/arm/faults.hh b/src/arch/arm/faults.hh
index de5061bed..8f860970d 100644
--- a/src/arch/arm/faults.hh
+++ b/src/arch/arm/faults.hh
@@ -545,6 +545,15 @@ class SystemError : public ArmFaultVals<SystemError>
     bool routeToHyp(ThreadContext *tc) const override;
 };
 
+/// System error (AArch64 only)
+class SoftwareBreakpoint : public ArmFaultVals<SoftwareBreakpoint>
+{
+  public:
+    SoftwareBreakpoint(ExtMachInst _mach_inst, uint32_t _iss);
+
+    bool routeToHyp(ThreadContext *tc) const override;
+};
+
 // A fault that flushes the pipe, excluding the faulting instructions
 class ArmSev : public ArmFaultVals<ArmSev>
 {
@@ -583,6 +592,7 @@ template<> ArmFault::FaultVals ArmFaultVals<SecureMonitorTrap>::vals;
 template<> ArmFault::FaultVals ArmFaultVals<PCAlignmentFault>::vals;
 template<> ArmFault::FaultVals ArmFaultVals<SPAlignmentFault>::vals;
 template<> ArmFault::FaultVals ArmFaultVals<SystemError>::vals;
+template<> ArmFault::FaultVals ArmFaultVals<SoftwareBreakpoint>::vals;
 template<> ArmFault::FaultVals ArmFaultVals<ArmSev>::vals;