//===-- NativeRegisterContextWindows_x86_64.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(__x86_64__) || defined(_M_X64) #include "NativeRegisterContextWindows_x86_64.h" #include "NativeRegisterContextWindows_WoW64.h" #include "NativeThreadWindows.h" #include "Plugins/Process/Utility/RegisterContextWindows_i386.h" #include "Plugins/Process/Utility/RegisterContextWindows_x86_64.h" #include "ProcessWindowsLog.h" #include "lldb/Host/HostInfo.h" #include "lldb/Host/HostThread.h" #include "lldb/Host/windows/HostThreadWindows.h" #include "lldb/Host/windows/windows.h" #include "lldb/Utility/Log.h" #include "lldb/Utility/RegisterValue.h" #include "llvm/ADT/STLExtras.h" using namespace lldb; using namespace lldb_private; #define REG_CONTEXT_SIZE sizeof(::CONTEXT) namespace { static const uint32_t g_gpr_regnums_x86_64[] = { lldb_rax_x86_64, lldb_rbx_x86_64, lldb_rcx_x86_64, lldb_rdx_x86_64, lldb_rdi_x86_64, lldb_rsi_x86_64, lldb_rbp_x86_64, lldb_rsp_x86_64, lldb_r8_x86_64, lldb_r9_x86_64, lldb_r10_x86_64, lldb_r11_x86_64, lldb_r12_x86_64, lldb_r13_x86_64, lldb_r14_x86_64, lldb_r15_x86_64, lldb_rip_x86_64, lldb_rflags_x86_64, lldb_cs_x86_64, lldb_fs_x86_64, lldb_gs_x86_64, lldb_ss_x86_64, lldb_ds_x86_64, lldb_es_x86_64, LLDB_INVALID_REGNUM // Register set must be terminated with this flag }; static const uint32_t g_fpr_regnums_x86_64[] = { lldb_xmm0_x86_64, lldb_xmm1_x86_64, lldb_xmm2_x86_64, lldb_xmm3_x86_64, lldb_xmm4_x86_64, lldb_xmm5_x86_64, lldb_xmm6_x86_64, lldb_xmm7_x86_64, lldb_xmm8_x86_64, lldb_xmm9_x86_64, lldb_xmm10_x86_64, lldb_xmm11_x86_64, lldb_xmm12_x86_64, lldb_xmm13_x86_64, lldb_xmm14_x86_64, lldb_xmm15_x86_64, LLDB_INVALID_REGNUM // Register set must be terminated with this flag }; static const RegisterSet g_reg_sets_x86_64[] = { {"General Purpose Registers", "gpr", llvm::array_lengthof(g_gpr_regnums_x86_64) - 1, g_gpr_regnums_x86_64}, {"Floating Point Registers", "fpr", llvm::array_lengthof(g_fpr_regnums_x86_64) - 1, g_fpr_regnums_x86_64}}; enum { k_num_register_sets = 2 }; } // namespace static RegisterInfoInterface * CreateRegisterInfoInterface(const ArchSpec &target_arch) { assert((HostInfo::GetArchitecture().GetAddressByteSize() == 8) && "Register setting path assumes this is a 64-bit host"); return new RegisterContextWindows_x86_64(target_arch); } static Status GetThreadContextHelper(lldb::thread_t thread_handle, PCONTEXT context_ptr, const DWORD control_flag) { Log *log = GetLog(WindowsLog::Registers); Status error; memset(context_ptr, 0, sizeof(::CONTEXT)); context_ptr->ContextFlags = control_flag; if (!::GetThreadContext(thread_handle, context_ptr)) { error.SetError(GetLastError(), eErrorTypeWin32); LLDB_LOG(log, "{0} GetThreadContext failed with error {1}", __FUNCTION__, error); return error; } return Status(); } static Status SetThreadContextHelper(lldb::thread_t thread_handle, PCONTEXT context_ptr) { Log *log = GetLog(WindowsLog::Registers); Status error; // It's assumed that the thread has stopped. if (!::SetThreadContext(thread_handle, context_ptr)) { error.SetError(GetLastError(), eErrorTypeWin32); LLDB_LOG(log, "{0} SetThreadContext failed with error {1}", __FUNCTION__, error); return error; } return Status(); } std::unique_ptr NativeRegisterContextWindows::CreateHostNativeRegisterContextWindows( const ArchSpec &target_arch, NativeThreadProtocol &native_thread) { // Register context for a WoW64 application. if (target_arch.GetAddressByteSize() == 4) return std::make_unique(target_arch, native_thread); // Register context for a native 64-bit application. return std::make_unique(target_arch, native_thread); } NativeRegisterContextWindows_x86_64::NativeRegisterContextWindows_x86_64( const ArchSpec &target_arch, NativeThreadProtocol &native_thread) : NativeRegisterContextWindows(native_thread, CreateRegisterInfoInterface(target_arch)) {} bool NativeRegisterContextWindows_x86_64::IsGPR(uint32_t reg_index) const { return (reg_index >= k_first_gpr_x86_64 && reg_index < k_first_alias_x86_64); } bool NativeRegisterContextWindows_x86_64::IsFPR(uint32_t reg_index) const { return (reg_index >= lldb_xmm0_x86_64 && reg_index <= k_last_fpr_x86_64); } bool NativeRegisterContextWindows_x86_64::IsDR(uint32_t reg_index) const { return (reg_index >= lldb_dr0_x86_64 && reg_index <= lldb_dr7_x86_64); } uint32_t NativeRegisterContextWindows_x86_64::GetRegisterSetCount() const { return k_num_register_sets; } const RegisterSet * NativeRegisterContextWindows_x86_64::GetRegisterSet(uint32_t set_index) const { if (set_index >= k_num_register_sets) return nullptr; return &g_reg_sets_x86_64[set_index]; } Status NativeRegisterContextWindows_x86_64::GPRRead(const uint32_t reg, RegisterValue ®_value) { ::CONTEXT tls_context; DWORD context_flag = CONTEXT_CONTROL | CONTEXT_INTEGER | CONTEXT_SEGMENTS; Status error = GetThreadContextHelper(GetThreadHandle(), &tls_context, context_flag); if (error.Fail()) return error; switch (reg) { case lldb_rax_x86_64: reg_value.SetUInt64(tls_context.Rax); break; case lldb_rbx_x86_64: reg_value.SetUInt64(tls_context.Rbx); break; case lldb_rcx_x86_64: reg_value.SetUInt64(tls_context.Rcx); break; case lldb_rdx_x86_64: reg_value.SetUInt64(tls_context.Rdx); break; case lldb_rdi_x86_64: reg_value.SetUInt64(tls_context.Rdi); break; case lldb_rsi_x86_64: reg_value.SetUInt64(tls_context.Rsi); break; case lldb_rbp_x86_64: reg_value.SetUInt64(tls_context.Rbp); break; case lldb_rsp_x86_64: reg_value.SetUInt64(tls_context.Rsp); break; case lldb_r8_x86_64: reg_value.SetUInt64(tls_context.R8); break; case lldb_r9_x86_64: reg_value.SetUInt64(tls_context.R9); break; case lldb_r10_x86_64: reg_value.SetUInt64(tls_context.R10); break; case lldb_r11_x86_64: reg_value.SetUInt64(tls_context.R11); break; case lldb_r12_x86_64: reg_value.SetUInt64(tls_context.R12); break; case lldb_r13_x86_64: reg_value.SetUInt64(tls_context.R13); break; case lldb_r14_x86_64: reg_value.SetUInt64(tls_context.R14); break; case lldb_r15_x86_64: reg_value.SetUInt64(tls_context.R15); break; case lldb_rip_x86_64: reg_value.SetUInt64(tls_context.Rip); break; case lldb_rflags_x86_64: reg_value.SetUInt64(tls_context.EFlags | 0x2); // Bit #1 always 1 break; case lldb_cs_x86_64: reg_value.SetUInt16(tls_context.SegCs); break; case lldb_fs_x86_64: reg_value.SetUInt16(tls_context.SegFs); break; case lldb_gs_x86_64: reg_value.SetUInt16(tls_context.SegGs); break; case lldb_ss_x86_64: reg_value.SetUInt16(tls_context.SegSs); break; case lldb_ds_x86_64: reg_value.SetUInt16(tls_context.SegDs); break; case lldb_es_x86_64: reg_value.SetUInt16(tls_context.SegEs); break; } return error; } Status NativeRegisterContextWindows_x86_64::GPRWrite(const uint32_t reg, const RegisterValue ®_value) { ::CONTEXT tls_context; DWORD context_flag = CONTEXT_CONTROL | CONTEXT_INTEGER | CONTEXT_SEGMENTS; auto thread_handle = GetThreadHandle(); Status error = GetThreadContextHelper(thread_handle, &tls_context, context_flag); if (error.Fail()) return error; switch (reg) { case lldb_rax_x86_64: tls_context.Rax = reg_value.GetAsUInt64(); break; case lldb_rbx_x86_64: tls_context.Rbx = reg_value.GetAsUInt64(); break; case lldb_rcx_x86_64: tls_context.Rcx = reg_value.GetAsUInt64(); break; case lldb_rdx_x86_64: tls_context.Rdx = reg_value.GetAsUInt64(); break; case lldb_rdi_x86_64: tls_context.Rdi = reg_value.GetAsUInt64(); break; case lldb_rsi_x86_64: tls_context.Rsi = reg_value.GetAsUInt64(); break; case lldb_rbp_x86_64: tls_context.Rbp = reg_value.GetAsUInt64(); break; case lldb_rsp_x86_64: tls_context.Rsp = reg_value.GetAsUInt64(); break; case lldb_r8_x86_64: tls_context.R8 = reg_value.GetAsUInt64(); break; case lldb_r9_x86_64: tls_context.R9 = reg_value.GetAsUInt64(); break; case lldb_r10_x86_64: tls_context.R10 = reg_value.GetAsUInt64(); break; case lldb_r11_x86_64: tls_context.R11 = reg_value.GetAsUInt64(); break; case lldb_r12_x86_64: tls_context.R12 = reg_value.GetAsUInt64(); break; case lldb_r13_x86_64: tls_context.R13 = reg_value.GetAsUInt64(); break; case lldb_r14_x86_64: tls_context.R14 = reg_value.GetAsUInt64(); break; case lldb_r15_x86_64: tls_context.R15 = reg_value.GetAsUInt64(); break; case lldb_rip_x86_64: tls_context.Rip = reg_value.GetAsUInt64(); break; case lldb_rflags_x86_64: tls_context.EFlags = reg_value.GetAsUInt64(); break; case lldb_cs_x86_64: tls_context.SegCs = reg_value.GetAsUInt16(); break; case lldb_fs_x86_64: tls_context.SegFs = reg_value.GetAsUInt16(); break; case lldb_gs_x86_64: tls_context.SegGs = reg_value.GetAsUInt16(); break; case lldb_ss_x86_64: tls_context.SegSs = reg_value.GetAsUInt16(); break; case lldb_ds_x86_64: tls_context.SegDs = reg_value.GetAsUInt16(); break; case lldb_es_x86_64: tls_context.SegEs = reg_value.GetAsUInt16(); break; } return SetThreadContextHelper(thread_handle, &tls_context); } Status NativeRegisterContextWindows_x86_64::FPRRead(const uint32_t reg, RegisterValue ®_value) { ::CONTEXT tls_context; DWORD context_flag = CONTEXT_CONTROL | CONTEXT_FLOATING_POINT; Status error = GetThreadContextHelper(GetThreadHandle(), &tls_context, context_flag); if (error.Fail()) return error; switch (reg) { case lldb_xmm0_x86_64: reg_value.SetBytes(&tls_context.Xmm0, 16, endian::InlHostByteOrder()); break; case lldb_xmm1_x86_64: reg_value.SetBytes(&tls_context.Xmm1, 16, endian::InlHostByteOrder()); break; case lldb_xmm2_x86_64: reg_value.SetBytes(&tls_context.Xmm2, 16, endian::InlHostByteOrder()); break; case lldb_xmm3_x86_64: reg_value.SetBytes(&tls_context.Xmm3, 16, endian::InlHostByteOrder()); break; case lldb_xmm4_x86_64: reg_value.SetBytes(&tls_context.Xmm4, 16, endian::InlHostByteOrder()); break; case lldb_xmm5_x86_64: reg_value.SetBytes(&tls_context.Xmm5, 16, endian::InlHostByteOrder()); break; case lldb_xmm6_x86_64: reg_value.SetBytes(&tls_context.Xmm6, 16, endian::InlHostByteOrder()); break; case lldb_xmm7_x86_64: reg_value.SetBytes(&tls_context.Xmm7, 16, endian::InlHostByteOrder()); break; case lldb_xmm8_x86_64: reg_value.SetBytes(&tls_context.Xmm8, 16, endian::InlHostByteOrder()); break; case lldb_xmm9_x86_64: reg_value.SetBytes(&tls_context.Xmm9, 16, endian::InlHostByteOrder()); break; case lldb_xmm10_x86_64: reg_value.SetBytes(&tls_context.Xmm10, 16, endian::InlHostByteOrder()); break; case lldb_xmm11_x86_64: reg_value.SetBytes(&tls_context.Xmm11, 16, endian::InlHostByteOrder()); break; case lldb_xmm12_x86_64: reg_value.SetBytes(&tls_context.Xmm12, 16, endian::InlHostByteOrder()); break; case lldb_xmm13_x86_64: reg_value.SetBytes(&tls_context.Xmm13, 16, endian::InlHostByteOrder()); break; case lldb_xmm14_x86_64: reg_value.SetBytes(&tls_context.Xmm14, 16, endian::InlHostByteOrder()); break; case lldb_xmm15_x86_64: reg_value.SetBytes(&tls_context.Xmm15, 16, endian::InlHostByteOrder()); break; } return error; } Status NativeRegisterContextWindows_x86_64::FPRWrite(const uint32_t reg, const RegisterValue ®_value) { ::CONTEXT tls_context; DWORD context_flag = CONTEXT_CONTROL | CONTEXT_FLOATING_POINT; auto thread_handle = GetThreadHandle(); Status error = GetThreadContextHelper(thread_handle, &tls_context, context_flag); if (error.Fail()) return error; switch (reg) { case lldb_xmm0_x86_64: memcpy(&tls_context.Xmm0, reg_value.GetBytes(), 16); break; case lldb_xmm1_x86_64: memcpy(&tls_context.Xmm1, reg_value.GetBytes(), 16); break; case lldb_xmm2_x86_64: memcpy(&tls_context.Xmm2, reg_value.GetBytes(), 16); break; case lldb_xmm3_x86_64: memcpy(&tls_context.Xmm3, reg_value.GetBytes(), 16); break; case lldb_xmm4_x86_64: memcpy(&tls_context.Xmm4, reg_value.GetBytes(), 16); break; case lldb_xmm5_x86_64: memcpy(&tls_context.Xmm5, reg_value.GetBytes(), 16); break; case lldb_xmm6_x86_64: memcpy(&tls_context.Xmm6, reg_value.GetBytes(), 16); break; case lldb_xmm7_x86_64: memcpy(&tls_context.Xmm7, reg_value.GetBytes(), 16); break; case lldb_xmm8_x86_64: memcpy(&tls_context.Xmm8, reg_value.GetBytes(), 16); break; case lldb_xmm9_x86_64: memcpy(&tls_context.Xmm9, reg_value.GetBytes(), 16); break; case lldb_xmm10_x86_64: memcpy(&tls_context.Xmm10, reg_value.GetBytes(), 16); break; case lldb_xmm11_x86_64: memcpy(&tls_context.Xmm11, reg_value.GetBytes(), 16); break; case lldb_xmm12_x86_64: memcpy(&tls_context.Xmm12, reg_value.GetBytes(), 16); break; case lldb_xmm13_x86_64: memcpy(&tls_context.Xmm13, reg_value.GetBytes(), 16); break; case lldb_xmm14_x86_64: memcpy(&tls_context.Xmm14, reg_value.GetBytes(), 16); break; case lldb_xmm15_x86_64: memcpy(&tls_context.Xmm15, reg_value.GetBytes(), 16); break; } return SetThreadContextHelper(thread_handle, &tls_context); } Status NativeRegisterContextWindows_x86_64::DRRead(const uint32_t reg, RegisterValue ®_value) { ::CONTEXT tls_context; DWORD context_flag = CONTEXT_DEBUG_REGISTERS; Status error = GetThreadContextHelper(GetThreadHandle(), &tls_context, context_flag); if (error.Fail()) return error; switch (reg) { case lldb_dr0_x86_64: reg_value.SetUInt64(tls_context.Dr0); break; case lldb_dr1_x86_64: reg_value.SetUInt64(tls_context.Dr1); break; case lldb_dr2_x86_64: reg_value.SetUInt64(tls_context.Dr2); break; case lldb_dr3_x86_64: reg_value.SetUInt64(tls_context.Dr3); break; case lldb_dr4_x86_64: return Status("register DR4 is obsolete"); case lldb_dr5_x86_64: return Status("register DR5 is obsolete"); case lldb_dr6_x86_64: reg_value.SetUInt64(tls_context.Dr6); break; case lldb_dr7_x86_64: reg_value.SetUInt64(tls_context.Dr7); break; } return {}; } Status NativeRegisterContextWindows_x86_64::DRWrite(const uint32_t reg, const RegisterValue ®_value) { ::CONTEXT tls_context; DWORD context_flag = CONTEXT_DEBUG_REGISTERS; auto thread_handle = GetThreadHandle(); Status error = GetThreadContextHelper(thread_handle, &tls_context, context_flag); if (error.Fail()) return error; switch (reg) { case lldb_dr0_x86_64: tls_context.Dr0 = reg_value.GetAsUInt64(); break; case lldb_dr1_x86_64: tls_context.Dr1 = reg_value.GetAsUInt64(); break; case lldb_dr2_x86_64: tls_context.Dr2 = reg_value.GetAsUInt64(); break; case lldb_dr3_x86_64: tls_context.Dr3 = reg_value.GetAsUInt64(); break; case lldb_dr4_x86_64: return Status("register DR4 is obsolete"); case lldb_dr5_x86_64: return Status("register DR5 is obsolete"); case lldb_dr6_x86_64: tls_context.Dr6 = reg_value.GetAsUInt64(); break; case lldb_dr7_x86_64: tls_context.Dr7 = reg_value.GetAsUInt64(); break; } return SetThreadContextHelper(thread_handle, &tls_context); } Status NativeRegisterContextWindows_x86_64::ReadRegister(const RegisterInfo *reg_info, RegisterValue ®_value) { Status error; if (!reg_info) { error.SetErrorString("reg_info NULL"); return error; } const uint32_t reg = reg_info->kinds[lldb::eRegisterKindLLDB]; if (reg == LLDB_INVALID_REGNUM) { // This is likely an internal register for lldb use only and should not be // directly queried. error.SetErrorStringWithFormat("register \"%s\" is an internal-only lldb " "register, cannot read directly", reg_info->name); return error; } if (IsGPR(reg)) return GPRRead(reg, reg_value); if (IsFPR(reg)) return FPRRead(reg, reg_value); if (IsDR(reg)) return DRRead(reg, reg_value); return Status("unimplemented"); } Status NativeRegisterContextWindows_x86_64::WriteRegister( const RegisterInfo *reg_info, const RegisterValue ®_value) { Status error; if (!reg_info) { error.SetErrorString("reg_info NULL"); return error; } const uint32_t reg = reg_info->kinds[lldb::eRegisterKindLLDB]; if (reg == LLDB_INVALID_REGNUM) { // This is likely an internal register for lldb use only and should not be // directly written. error.SetErrorStringWithFormat("register \"%s\" is an internal-only lldb " "register, cannot write directly", reg_info->name); return error; } if (IsGPR(reg)) return GPRWrite(reg, reg_value); if (IsFPR(reg)) return FPRWrite(reg, reg_value); if (IsDR(reg)) return DRWrite(reg, reg_value); return Status("unimplemented"); } Status NativeRegisterContextWindows_x86_64::ReadAllRegisterValues( lldb::DataBufferSP &data_sp) { const size_t data_size = REG_CONTEXT_SIZE; data_sp = std::make_shared(data_size, 0); ::CONTEXT tls_context; Status error = GetThreadContextHelper(GetThreadHandle(), &tls_context, CONTEXT_ALL); if (error.Fail()) return error; uint8_t *dst = data_sp->GetBytes(); ::memcpy(dst, &tls_context, data_size); return error; } Status NativeRegisterContextWindows_x86_64::WriteAllRegisterValues( const lldb::DataBufferSP &data_sp) { Status error; const size_t data_size = REG_CONTEXT_SIZE; if (!data_sp) { error.SetErrorStringWithFormat( "NativeRegisterContextWindows_x86_64::%s invalid data_sp provided", __FUNCTION__); return error; } if (data_sp->GetByteSize() != data_size) { error.SetErrorStringWithFormatv( "data_sp contained mismatched data size, expected {0}, actual {1}", data_size, data_sp->GetByteSize()); return error; } ::CONTEXT tls_context; memcpy(&tls_context, data_sp->GetBytes(), data_size); return SetThreadContextHelper(GetThreadHandle(), &tls_context); } Status NativeRegisterContextWindows_x86_64::IsWatchpointHit(uint32_t wp_index, bool &is_hit) { is_hit = false; if (wp_index >= NumSupportedHardwareWatchpoints()) return Status("watchpoint index out of range"); RegisterValue reg_value; Status error = DRRead(lldb_dr6_x86_64, reg_value); if (error.Fail()) return error; is_hit = reg_value.GetAsUInt64() & (1ULL << wp_index); return {}; } Status NativeRegisterContextWindows_x86_64::GetWatchpointHitIndex( uint32_t &wp_index, lldb::addr_t trap_addr) { wp_index = LLDB_INVALID_INDEX32; for (uint32_t i = 0; i < NumSupportedHardwareWatchpoints(); i++) { bool is_hit; Status error = IsWatchpointHit(i, is_hit); if (error.Fail()) return error; if (is_hit) { wp_index = i; return {}; } } return {}; } Status NativeRegisterContextWindows_x86_64::IsWatchpointVacant(uint32_t wp_index, bool &is_vacant) { is_vacant = false; if (wp_index >= NumSupportedHardwareWatchpoints()) return Status("Watchpoint index out of range"); RegisterValue reg_value; Status error = DRRead(lldb_dr7_x86_64, reg_value); if (error.Fail()) return error; is_vacant = !(reg_value.GetAsUInt64() & (1ULL << (2 * wp_index))); return error; } bool NativeRegisterContextWindows_x86_64::ClearHardwareWatchpoint( uint32_t wp_index) { if (wp_index >= NumSupportedHardwareWatchpoints()) return false; // for watchpoints 0, 1, 2, or 3, respectively, clear bits 0, 1, 2, or 3 of // the debug status register (DR6) RegisterValue reg_value; Status error = DRRead(lldb_dr6_x86_64, reg_value); if (error.Fail()) return false; uint64_t bit_mask = 1ULL << wp_index; uint64_t status_bits = reg_value.GetAsUInt64() & ~bit_mask; error = DRWrite(lldb_dr6_x86_64, RegisterValue(status_bits)); if (error.Fail()) return false; // for watchpoints 0, 1, 2, or 3, respectively, clear bits {0-1,16-19}, // {2-3,20-23}, {4-5,24-27}, or {6-7,28-31} of the debug control register // (DR7) error = DRRead(lldb_dr7_x86_64, reg_value); if (error.Fail()) return false; bit_mask = (0x3 << (2 * wp_index)) | (0xF << (16 + 4 * wp_index)); uint64_t control_bits = reg_value.GetAsUInt64() & ~bit_mask; return DRWrite(lldb_dr7_x86_64, RegisterValue(control_bits)).Success(); } Status NativeRegisterContextWindows_x86_64::ClearAllHardwareWatchpoints() { RegisterValue reg_value; // clear bits {0-4} of the debug status register (DR6) Status error = DRRead(lldb_dr6_x86_64, reg_value); if (error.Fail()) return error; uint64_t status_bits = reg_value.GetAsUInt64() & ~0xFULL; error = DRWrite(lldb_dr6_x86_64, RegisterValue(status_bits)); if (error.Fail()) return error; // clear bits {0-7,16-31} of the debug control register (DR7) error = DRRead(lldb_dr7_x86_64, reg_value); if (error.Fail()) return error; uint64_t control_bits = reg_value.GetAsUInt64() & ~0xFFFF00FFULL; return DRWrite(lldb_dr7_x86_64, RegisterValue(control_bits)); } uint32_t NativeRegisterContextWindows_x86_64::SetHardwareWatchpoint( lldb::addr_t addr, size_t size, uint32_t watch_flags) { switch (size) { case 1: case 2: case 4: case 8: break; default: return LLDB_INVALID_INDEX32; } if (watch_flags == 0x2) watch_flags = 0x3; if (watch_flags != 0x1 && watch_flags != 0x3) return LLDB_INVALID_INDEX32; for (uint32_t wp_index = 0; wp_index < NumSupportedHardwareWatchpoints(); ++wp_index) { bool is_vacant; if (IsWatchpointVacant(wp_index, is_vacant).Fail()) return LLDB_INVALID_INDEX32; if (is_vacant) { if (!ClearHardwareWatchpoint(wp_index)) return LLDB_INVALID_INDEX32; if (ApplyHardwareBreakpoint(wp_index, addr, size, watch_flags).Fail()) return LLDB_INVALID_INDEX32; return wp_index; } } return LLDB_INVALID_INDEX32; } Status NativeRegisterContextWindows_x86_64::ApplyHardwareBreakpoint( uint32_t wp_index, lldb::addr_t addr, size_t size, uint32_t flags) { RegisterValue reg_value; auto error = DRRead(lldb_dr7_x86_64, reg_value); if (error.Fail()) return error; // for watchpoints 0, 1, 2, or 3, respectively, set bits 1, 3, 5, or 7 uint64_t enable_bit = 1ULL << (2 * wp_index); // set bits 16-17, 20-21, 24-25, or 28-29 // with 0b01 for write, and 0b11 for read/write uint64_t rw_bits = flags << (16 + 4 * wp_index); // set bits 18-19, 22-23, 26-27, or 30-31 // with 0b00, 0b01, 0b10, or 0b11 // for 1, 2, 8 (if supported), or 4 bytes, respectively uint64_t size_bits = (size == 8 ? 0x2 : size - 1) << (18 + 4 * wp_index); uint64_t bit_mask = (0x3 << (2 * wp_index)) | (0xF << (16 + 4 * wp_index)); uint64_t control_bits = reg_value.GetAsUInt64() & ~bit_mask; control_bits |= enable_bit | rw_bits | size_bits; error = DRWrite(lldb_dr7_x86_64, RegisterValue(control_bits)); if (error.Fail()) return error; error = DRWrite(lldb_dr0_x86_64 + wp_index, RegisterValue(addr)); if (error.Fail()) return error; return {}; } lldb::addr_t NativeRegisterContextWindows_x86_64::GetWatchpointAddress(uint32_t wp_index) { if (wp_index >= NumSupportedHardwareWatchpoints()) return LLDB_INVALID_ADDRESS; RegisterValue reg_value; if (DRRead(lldb_dr0_x86_64 + wp_index, reg_value).Fail()) return LLDB_INVALID_ADDRESS; return reg_value.GetAsUInt64(); } uint32_t NativeRegisterContextWindows_x86_64::NumSupportedHardwareWatchpoints() { return 4; } #endif // defined(__x86_64__) || defined(_M_X64)