1 files changed, 110 insertions, 0 deletions
diff --git a/lldb/source/Plugins/Process/FreeBSDKernel/RegisterContextFreeBSDKernel_arm64.cpp b/lldb/source/Plugins/Process/FreeBSDKernel/RegisterContextFreeBSDKernel_arm64.cpp
new file mode 100644
index 000000000000..11843ddc82d9
--- /dev/null
+++ b/lldb/source/Plugins/Process/FreeBSDKernel/RegisterContextFreeBSDKernel_arm64.cpp
@@ -0,0 +1,110 @@
+//===-- RegisterContextFreeBSDKernel_arm64.cpp ----------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "RegisterContextFreeBSDKernel_arm64.h"
+#include "Plugins/Process/Utility/lldb-arm64-register-enums.h"
+
+#include "lldb/Target/Process.h"
+#include "lldb/Target/Thread.h"
+#include "lldb/Utility/RegisterValue.h"
+#include "llvm/Support/Endian.h"
+
+using namespace lldb;
+using namespace lldb_private;
+
+RegisterContextFreeBSDKernel_arm64::RegisterContextFreeBSDKernel_arm64(
+    Thread &thread, std::unique_ptr<RegisterInfoPOSIX_arm64> register_info_up,
+    lldb::addr_t pcb_addr)
+    : RegisterContextPOSIX_arm64(thread, std::move(register_info_up)),
+      m_pcb_addr(pcb_addr) {}
+
+bool RegisterContextFreeBSDKernel_arm64::ReadGPR() { return true; }
+
+bool RegisterContextFreeBSDKernel_arm64::ReadFPR() { return true; }
+
+bool RegisterContextFreeBSDKernel_arm64::WriteGPR() {
+  assert(0);
+  return false;
+}
+
+bool RegisterContextFreeBSDKernel_arm64::WriteFPR() {
+  assert(0);
+  return false;
+}
+
+bool RegisterContextFreeBSDKernel_arm64::ReadRegister(
+    const RegisterInfo *reg_info, RegisterValue &value) {
+  if (m_pcb_addr == LLDB_INVALID_ADDRESS)
+    return false;
+
+  struct {
+    llvm::support::ulittle64_t x[30];
+    llvm::support::ulittle64_t lr;
+    llvm::support::ulittle64_t _reserved;
+    llvm::support::ulittle64_t sp;
+  } pcb;
+
+  Status error;
+  size_t rd =
+      m_thread.GetProcess()->ReadMemory(m_pcb_addr, &pcb, sizeof(pcb), error);
+  if (rd != sizeof(pcb))
+    return false;
+
+  uint32_t reg = reg_info->kinds[lldb::eRegisterKindLLDB];
+  switch (reg) {
+  case gpr_x0_arm64:
+  case gpr_x1_arm64:
+  case gpr_x2_arm64:
+  case gpr_x3_arm64:
+  case gpr_x4_arm64:
+  case gpr_x5_arm64:
+  case gpr_x6_arm64:
+  case gpr_x7_arm64:
+  case gpr_x8_arm64:
+  case gpr_x9_arm64:
+  case gpr_x10_arm64:
+  case gpr_x11_arm64:
+  case gpr_x12_arm64:
+  case gpr_x13_arm64:
+  case gpr_x14_arm64:
+  case gpr_x15_arm64:
+  case gpr_x16_arm64:
+  case gpr_x17_arm64:
+  case gpr_x18_arm64:
+  case gpr_x19_arm64:
+  case gpr_x20_arm64:
+  case gpr_x21_arm64:
+  case gpr_x22_arm64:
+  case gpr_x23_arm64:
+  case gpr_x24_arm64:
+  case gpr_x25_arm64:
+  case gpr_x26_arm64:
+  case gpr_x27_arm64:
+  case gpr_x28_arm64:
+  case gpr_fp_arm64:
+    static_assert(gpr_fp_arm64 - gpr_x0_arm64 == 29,
+                  "nonconsecutive arm64 register numbers");
+    value = pcb.x[reg - gpr_x0_arm64];
+    break;
+  case gpr_sp_arm64:
+    value = pcb.sp;
+    break;
+  case gpr_pc_arm64:
+    // The pc of crashing thread is stored in lr.
+    value = pcb.lr;
+    break;
+  default:
+    return false;
+  }
+  return true;
+}
+
+bool RegisterContextFreeBSDKernel_arm64::WriteRegister(
+    const RegisterInfo *reg_info, const RegisterValue &value) {
+  return false;
+}