lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_arm64dbreg.cpp

//===-- NativeRegisterContextLinux_arm64dbreg.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
//
//===----------------------------------------------------------------------===//

#if defined(__arm64__) || defined(__aarch64__)

#include "NativeRegisterContextLinux_arm64dbreg.h"

// System includes - They have to be included after framework includes because
// they define some macros which collide with variable names in other modules.
#include <asm/ptrace.h>
#include <elf.h>
#include <sys/ptrace.h>
#include <sys/uio.h>

#ifndef PTRACE_GETREGSET
#define PTRACE_GETREGSET 0x4204
#endif

#ifndef PTRACE_SETREGSET
#define PTRACE_SETREGSET 0x4205
#endif

using namespace lldb;
using namespace lldb_private;
using namespace lldb_private::process_linux;

static Status ReadHardwareDebugInfoHelper(int regset, ::pid_t tid,
                                          uint32_t &max_supported) {
  struct iovec ioVec;
  struct user_hwdebug_state dreg_state;
  Status error;

  ioVec.iov_base = &dreg_state;
  ioVec.iov_len = sizeof(dreg_state);
  error = NativeProcessLinux::PtraceWrapper(PTRACE_GETREGSET, tid, &regset,
                                            &ioVec, ioVec.iov_len);

  if (error.Fail())
    return error;

  max_supported = dreg_state.dbg_info & 0xff;
  return error;
}

Status lldb_private::process_linux::arm64::ReadHardwareDebugInfo(
    ::pid_t tid, uint32_t &max_hwp_supported, uint32_t &max_hbp_supported) {
  Status error =
      ReadHardwareDebugInfoHelper(NT_ARM_HW_WATCH, tid, max_hwp_supported);

  if (error.Fail())
    return error;

  return ReadHardwareDebugInfoHelper(NT_ARM_HW_BREAK, tid, max_hbp_supported);
}

Status lldb_private::process_linux::arm64::WriteHardwareDebugRegs(
    int hwbType, ::pid_t tid, uint32_t max_supported,
    const std::array<NativeRegisterContextDBReg::DREG, 16> &regs) {
  int regset = hwbType == NativeRegisterContextDBReg::eDREGTypeWATCH
                   ? NT_ARM_HW_WATCH
                   : NT_ARM_HW_BREAK;

  struct user_hwdebug_state dreg_state;
  memset(&dreg_state, 0, sizeof(dreg_state));
  for (uint32_t i = 0; i < max_supported; i++) {
    dreg_state.dbg_regs[i].addr = regs[i].address;
    dreg_state.dbg_regs[i].ctrl = regs[i].control;
  }

  struct iovec ioVec;
  ioVec.iov_base = &dreg_state;
  ioVec.iov_len = sizeof(dreg_state.dbg_info) + sizeof(dreg_state.pad) +
                  (sizeof(dreg_state.dbg_regs[0]) * max_supported);

  return NativeProcessLinux::PtraceWrapper(PTRACE_SETREGSET, tid, &regset,
                                           &ioVec, ioVec.iov_len);
}

#endif // defined (__arm64__) || defined (__aarch64__)