diff options
Diffstat (limited to 'contrib/llvm-project/lldb/source/Plugins/Process/FreeBSD/RegisterContextPOSIXProcessMonitor_x86.cpp')
| -rw-r--r-- | contrib/llvm-project/lldb/source/Plugins/Process/FreeBSD/RegisterContextPOSIXProcessMonitor_x86.cpp | 613 |
1 files changed, 0 insertions, 613 deletions
diff --git a/contrib/llvm-project/lldb/source/Plugins/Process/FreeBSD/RegisterContextPOSIXProcessMonitor_x86.cpp b/contrib/llvm-project/lldb/source/Plugins/Process/FreeBSD/RegisterContextPOSIXProcessMonitor_x86.cpp deleted file mode 100644 index b1739e1e3bd8..000000000000 --- a/contrib/llvm-project/lldb/source/Plugins/Process/FreeBSD/RegisterContextPOSIXProcessMonitor_x86.cpp +++ /dev/null @@ -1,613 +0,0 @@ -//===-- RegisterContextPOSIXProcessMonitor_x86.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 "lldb/Target/Thread.h" -#include "lldb/Utility/DataBufferHeap.h" -#include "lldb/Utility/RegisterValue.h" - -#include "Plugins/Process/FreeBSD/ProcessFreeBSD.h" -#include "Plugins/Process/FreeBSD/ProcessMonitor.h" -#include "RegisterContextPOSIXProcessMonitor_x86.h" - -using namespace lldb_private; -using namespace lldb; - -// Support ptrace extensions even when compiled without required kernel support -#ifndef NT_X86_XSTATE -#define NT_X86_XSTATE 0x202 -#endif - -#define REG_CONTEXT_SIZE (GetGPRSize() + sizeof(FPR)) - -static uint32_t size_and_rw_bits(size_t size, bool read, bool write) { - uint32_t rw; - - if (read) - rw = 0x3; // READ or READ/WRITE - else if (write) - rw = 0x1; // WRITE - else - assert(0 && "read and write cannot both be false"); - - switch (size) { - case 1: - return rw; - case 2: - return (0x1 << 2) | rw; - case 4: - return (0x3 << 2) | rw; - case 8: - return (0x2 << 2) | rw; - default: - assert(0 && "invalid size, must be one of 1, 2, 4, or 8"); - return 0; // Unreachable. Just to silence compiler. - } -} - -RegisterContextPOSIXProcessMonitor_x86_64:: - RegisterContextPOSIXProcessMonitor_x86_64( - Thread &thread, uint32_t concrete_frame_idx, - lldb_private::RegisterInfoInterface *register_info) - : RegisterContextPOSIX_x86(thread, concrete_frame_idx, register_info) { - // Store byte offset of fctrl (i.e. first register of FPR) wrt 'UserArea' - const RegisterInfo *reg_info_fctrl = GetRegisterInfoByName("fctrl"); - m_fctrl_offset_in_userarea = reg_info_fctrl->byte_offset; - - m_iovec.iov_base = &m_fpr.xsave; - m_iovec.iov_len = sizeof(m_fpr.xsave); -} - -ProcessMonitor &RegisterContextPOSIXProcessMonitor_x86_64::GetMonitor() { - ProcessSP base = CalculateProcess(); - ProcessFreeBSD *process = static_cast<ProcessFreeBSD *>(base.get()); - return process->GetMonitor(); -} - -bool RegisterContextPOSIXProcessMonitor_x86_64::ReadGPR() { - ProcessMonitor &monitor = GetMonitor(); - return monitor.ReadGPR(m_thread.GetID(), &m_gpr_x86_64, GetGPRSize()); -} - -bool RegisterContextPOSIXProcessMonitor_x86_64::ReadFPR() { - ProcessMonitor &monitor = GetMonitor(); - if (GetFPRType() == eFXSAVE) - return monitor.ReadFPR(m_thread.GetID(), &m_fpr.fxsave, - sizeof(m_fpr.fxsave)); - - if (GetFPRType() == eXSAVE) - return monitor.ReadRegisterSet(m_thread.GetID(), &m_iovec, - sizeof(m_fpr.xsave), NT_X86_XSTATE); - return false; -} - -bool RegisterContextPOSIXProcessMonitor_x86_64::WriteGPR() { - ProcessMonitor &monitor = GetMonitor(); - return monitor.WriteGPR(m_thread.GetID(), &m_gpr_x86_64, GetGPRSize()); -} - -bool RegisterContextPOSIXProcessMonitor_x86_64::WriteFPR() { - ProcessMonitor &monitor = GetMonitor(); - if (GetFPRType() == eFXSAVE) - return monitor.WriteFPR(m_thread.GetID(), &m_fpr.fxsave, - sizeof(m_fpr.fxsave)); - - if (GetFPRType() == eXSAVE) - return monitor.WriteRegisterSet(m_thread.GetID(), &m_iovec, - sizeof(m_fpr.xsave), NT_X86_XSTATE); - return false; -} - -bool RegisterContextPOSIXProcessMonitor_x86_64::ReadRegister( - const unsigned reg, RegisterValue &value) { - ProcessMonitor &monitor = GetMonitor(); - -#if defined(__FreeBSD__) - if (reg >= m_reg_info.first_dr) - return monitor.ReadDebugRegisterValue( - m_thread.GetID(), GetRegisterOffset(reg), GetRegisterName(reg), - GetRegisterSize(reg), value); -#endif - return monitor.ReadRegisterValue(m_thread.GetID(), GetRegisterOffset(reg), - GetRegisterName(reg), GetRegisterSize(reg), - value); -} - -bool RegisterContextPOSIXProcessMonitor_x86_64::WriteRegister( - const unsigned reg, const RegisterValue &value) { - unsigned reg_to_write = reg; - RegisterValue value_to_write = value; - - // Check if this is a subregister of a full register. - const RegisterInfo *reg_info = GetRegisterInfoAtIndex(reg); - if (reg_info->invalidate_regs && - (reg_info->invalidate_regs[0] != LLDB_INVALID_REGNUM)) { - RegisterValue full_value; - uint32_t full_reg = reg_info->invalidate_regs[0]; - const RegisterInfo *full_reg_info = GetRegisterInfoAtIndex(full_reg); - - // Read the full register. - if (ReadRegister(full_reg_info, full_value)) { - Status error; - ByteOrder byte_order = GetByteOrder(); - uint8_t dst[RegisterValue::kMaxRegisterByteSize]; - - // Get the bytes for the full register. - const uint32_t dest_size = full_value.GetAsMemoryData( - full_reg_info, dst, sizeof(dst), byte_order, error); - if (error.Success() && dest_size) { - uint8_t src[RegisterValue::kMaxRegisterByteSize]; - - // Get the bytes for the source data. - const uint32_t src_size = value.GetAsMemoryData( - reg_info, src, sizeof(src), byte_order, error); - if (error.Success() && src_size && (src_size < dest_size)) { - // Copy the src bytes to the destination. - memcpy(dst + (reg_info->byte_offset & 0x1), src, src_size); - // Set this full register as the value to write. - value_to_write.SetBytes(dst, full_value.GetByteSize(), byte_order); - value_to_write.SetType(full_reg_info); - reg_to_write = full_reg; - } - } - } - } - - ProcessMonitor &monitor = GetMonitor(); -#if defined(__FreeBSD__) - if (reg >= m_reg_info.first_dr) - return monitor.WriteDebugRegisterValue( - m_thread.GetID(), GetRegisterOffset(reg_to_write), - GetRegisterName(reg_to_write), value_to_write); -#endif - return monitor.WriteRegisterValue( - m_thread.GetID(), GetRegisterOffset(reg_to_write), - GetRegisterName(reg_to_write), value_to_write); -} - -bool RegisterContextPOSIXProcessMonitor_x86_64::ReadRegister( - const RegisterInfo *reg_info, RegisterValue &value) { - if (!reg_info) - return false; - - const uint32_t reg = reg_info->kinds[eRegisterKindLLDB]; - - if (IsFPR(reg, GetFPRType())) { - if (!ReadFPR()) - return false; - } else { - uint32_t full_reg = reg; - bool is_subreg = reg_info->invalidate_regs && - (reg_info->invalidate_regs[0] != LLDB_INVALID_REGNUM); - - if (is_subreg) { - // Read the full aligned 64-bit register. - full_reg = reg_info->invalidate_regs[0]; - } - - bool success = ReadRegister(full_reg, value); - - if (success) { - // If our read was not aligned (for ah,bh,ch,dh), shift our returned - // value one byte to the right. - if (is_subreg && (reg_info->byte_offset & 0x1)) - value.SetUInt64(value.GetAsUInt64() >> 8); - - // If our return byte size was greater than the return value reg size, - // then use the type specified by reg_info rather than the uint64_t - // default - if (value.GetByteSize() > reg_info->byte_size) - value.SetType(reg_info); - } - return success; - } - - if (reg_info->encoding == eEncodingVector) { - ByteOrder byte_order = GetByteOrder(); - - if (byte_order != ByteOrder::eByteOrderInvalid) { - if (reg >= m_reg_info.first_st && reg <= m_reg_info.last_st) - value.SetBytes(m_fpr.fxsave.stmm[reg - m_reg_info.first_st].bytes, - reg_info->byte_size, byte_order); - if (reg >= m_reg_info.first_mm && reg <= m_reg_info.last_mm) - value.SetBytes(m_fpr.fxsave.stmm[reg - m_reg_info.first_mm].bytes, - reg_info->byte_size, byte_order); - if (reg >= m_reg_info.first_xmm && reg <= m_reg_info.last_xmm) - value.SetBytes(m_fpr.fxsave.xmm[reg - m_reg_info.first_xmm].bytes, - reg_info->byte_size, byte_order); - if (reg >= m_reg_info.first_ymm && reg <= m_reg_info.last_ymm) { - // Concatenate ymm using the register halves in xmm.bytes and - // ymmh.bytes - if (GetFPRType() == eXSAVE && CopyXSTATEtoYMM(reg, byte_order)) - value.SetBytes(m_ymm_set.ymm[reg - m_reg_info.first_ymm].bytes, - reg_info->byte_size, byte_order); - else - return false; - } - return value.GetType() == RegisterValue::eTypeBytes; - } - return false; - } - - // Get pointer to m_fpr.fxsave variable and set the data from it. Byte - // offsets of all registers are calculated wrt 'UserArea' structure. However, - // ReadFPR() reads fpu registers {using ptrace(PT_GETFPREGS,..)} and stores - // them in 'm_fpr' (of type FPR structure). To extract values of fpu - // registers, m_fpr should be read at byte offsets calculated wrt to FPR - // structure. - - // Since, FPR structure is also one of the member of UserArea structure. - // byte_offset(fpu wrt FPR) = byte_offset(fpu wrt UserArea) - - // byte_offset(fctrl wrt UserArea) - assert((reg_info->byte_offset - m_fctrl_offset_in_userarea) < sizeof(m_fpr)); - uint8_t *src = - (uint8_t *)&m_fpr + reg_info->byte_offset - m_fctrl_offset_in_userarea; - switch (reg_info->byte_size) { - case 1: - value.SetUInt8(*(uint8_t *)src); - return true; - case 2: - value.SetUInt16(*(uint16_t *)src); - return true; - case 4: - value.SetUInt32(*(uint32_t *)src); - return true; - case 8: - value.SetUInt64(*(uint64_t *)src); - return true; - default: - assert(false && "Unhandled data size."); - return false; - } -} - -bool RegisterContextPOSIXProcessMonitor_x86_64::WriteRegister( - const RegisterInfo *reg_info, const RegisterValue &value) { - const uint32_t reg = reg_info->kinds[eRegisterKindLLDB]; - - if (IsGPR(reg)) - return WriteRegister(reg, value); - - if (IsFPR(reg, GetFPRType())) { - if (reg_info->encoding == eEncodingVector) { - if (reg >= m_reg_info.first_st && reg <= m_reg_info.last_st) - ::memcpy(m_fpr.fxsave.stmm[reg - m_reg_info.first_st].bytes, - value.GetBytes(), value.GetByteSize()); - - if (reg >= m_reg_info.first_mm && reg <= m_reg_info.last_mm) - ::memcpy(m_fpr.fxsave.stmm[reg - m_reg_info.first_mm].bytes, - value.GetBytes(), value.GetByteSize()); - - if (reg >= m_reg_info.first_xmm && reg <= m_reg_info.last_xmm) - ::memcpy(m_fpr.fxsave.xmm[reg - m_reg_info.first_xmm].bytes, - value.GetBytes(), value.GetByteSize()); - - if (reg >= m_reg_info.first_ymm && reg <= m_reg_info.last_ymm) { - if (GetFPRType() != eXSAVE) - return false; // the target processor does not support AVX - - // Store ymm register content, and split into the register halves in - // xmm.bytes and ymmh.bytes - ::memcpy(m_ymm_set.ymm[reg - m_reg_info.first_ymm].bytes, - value.GetBytes(), value.GetByteSize()); - if (false == CopyYMMtoXSTATE(reg, GetByteOrder())) - return false; - } - } else { - // Get pointer to m_fpr.fxsave variable and set the data to it. Byte - // offsets of all registers are calculated wrt 'UserArea' structure. - // However, WriteFPR() takes m_fpr (of type FPR structure) and writes - // only fpu registers using ptrace(PT_SETFPREGS,..) API. Hence fpu - // registers should be written in m_fpr at byte offsets calculated wrt - // FPR structure. - - // Since, FPR structure is also one of the member of UserArea structure. - // byte_offset(fpu wrt FPR) = byte_offset(fpu wrt UserArea) - - // byte_offset(fctrl wrt UserArea) - assert((reg_info->byte_offset - m_fctrl_offset_in_userarea) < - sizeof(m_fpr)); - uint8_t *dst = (uint8_t *)&m_fpr + reg_info->byte_offset - - m_fctrl_offset_in_userarea; - switch (reg_info->byte_size) { - case 1: - *(uint8_t *)dst = value.GetAsUInt8(); - break; - case 2: - *(uint16_t *)dst = value.GetAsUInt16(); - break; - case 4: - *(uint32_t *)dst = value.GetAsUInt32(); - break; - case 8: - *(uint64_t *)dst = value.GetAsUInt64(); - break; - default: - assert(false && "Unhandled data size."); - return false; - } - } - - if (WriteFPR()) { - if (IsAVX(reg)) - return CopyYMMtoXSTATE(reg, GetByteOrder()); - return true; - } - } - return false; -} - -bool RegisterContextPOSIXProcessMonitor_x86_64::ReadAllRegisterValues( - DataBufferSP &data_sp) { - bool success = false; - data_sp.reset(new DataBufferHeap(REG_CONTEXT_SIZE, 0)); - if (ReadGPR() && ReadFPR()) { - uint8_t *dst = data_sp->GetBytes(); - success = dst != 0; - - if (success) { - ::memcpy(dst, &m_gpr_x86_64, GetGPRSize()); - dst += GetGPRSize(); - if (GetFPRType() == eFXSAVE) - ::memcpy(dst, &m_fpr.fxsave, sizeof(m_fpr.fxsave)); - } - - if (GetFPRType() == eXSAVE) { - ByteOrder byte_order = GetByteOrder(); - - // Assemble the YMM register content from the register halves. - for (uint32_t reg = m_reg_info.first_ymm; - success && reg <= m_reg_info.last_ymm; ++reg) - success = CopyXSTATEtoYMM(reg, byte_order); - - if (success) { - // Copy the extended register state including the assembled ymm - // registers. - ::memcpy(dst, &m_fpr, sizeof(m_fpr)); - } - } - } - return success; -} - -bool RegisterContextPOSIXProcessMonitor_x86_64::WriteAllRegisterValues( - const DataBufferSP &data_sp) { - bool success = false; - if (data_sp && data_sp->GetByteSize() == REG_CONTEXT_SIZE) { - uint8_t *src = data_sp->GetBytes(); - if (src) { - ::memcpy(&m_gpr_x86_64, src, GetGPRSize()); - - if (WriteGPR()) { - src += GetGPRSize(); - if (GetFPRType() == eFXSAVE) - ::memcpy(&m_fpr.fxsave, src, sizeof(m_fpr.fxsave)); - if (GetFPRType() == eXSAVE) - ::memcpy(&m_fpr.xsave, src, sizeof(m_fpr.xsave)); - - success = WriteFPR(); - if (success) { - if (GetFPRType() == eXSAVE) { - ByteOrder byte_order = GetByteOrder(); - - // Parse the YMM register content from the register halves. - for (uint32_t reg = m_reg_info.first_ymm; - success && reg <= m_reg_info.last_ymm; ++reg) - success = CopyYMMtoXSTATE(reg, byte_order); - } - } - } - } - } - return success; -} - -uint32_t RegisterContextPOSIXProcessMonitor_x86_64::SetHardwareWatchpoint( - addr_t addr, size_t size, bool read, bool write) { - const uint32_t num_hw_watchpoints = NumSupportedHardwareWatchpoints(); - uint32_t hw_index; - - for (hw_index = 0; hw_index < num_hw_watchpoints; ++hw_index) { - if (IsWatchpointVacant(hw_index)) - return SetHardwareWatchpointWithIndex(addr, size, read, write, hw_index); - } - - return LLDB_INVALID_INDEX32; -} - -bool RegisterContextPOSIXProcessMonitor_x86_64::ClearHardwareWatchpoint( - uint32_t hw_index) { - if (hw_index < NumSupportedHardwareWatchpoints()) { - RegisterValue current_dr7_bits; - - if (ReadRegister(m_reg_info.first_dr + 7, current_dr7_bits)) { - uint64_t new_dr7_bits = - current_dr7_bits.GetAsUInt64() & ~(3 << (2 * hw_index)); - - if (WriteRegister(m_reg_info.first_dr + 7, RegisterValue(new_dr7_bits))) - return true; - } - } - - return false; -} - -bool RegisterContextPOSIXProcessMonitor_x86_64::HardwareSingleStep( - bool enable) { - enum { TRACE_BIT = 0x100 }; - uint64_t rflags; - - if ((rflags = ReadRegisterAsUnsigned(m_reg_info.gpr_flags, -1UL)) == -1UL) - return false; - - if (enable) { - if (rflags & TRACE_BIT) - return true; - - rflags |= TRACE_BIT; - } else { - if (!(rflags & TRACE_BIT)) - return false; - - rflags &= ~TRACE_BIT; - } - - return WriteRegisterFromUnsigned(m_reg_info.gpr_flags, rflags); -} - -bool RegisterContextPOSIXProcessMonitor_x86_64::UpdateAfterBreakpoint() { - // PC points one byte past the int3 responsible for the breakpoint. - lldb::addr_t pc; - - if ((pc = GetPC()) == LLDB_INVALID_ADDRESS) - return false; - - SetPC(pc - 1); - return true; -} - -unsigned RegisterContextPOSIXProcessMonitor_x86_64::GetRegisterIndexFromOffset( - unsigned offset) { - unsigned reg; - for (reg = 0; reg < m_reg_info.num_registers; reg++) { - if (GetRegisterInfo()[reg].byte_offset == offset) - break; - } - assert(reg < m_reg_info.num_registers && "Invalid register offset."); - return reg; -} - -bool RegisterContextPOSIXProcessMonitor_x86_64::IsWatchpointHit( - uint32_t hw_index) { - bool is_hit = false; - - if (m_watchpoints_initialized == false) { - // Reset the debug status and debug control registers - RegisterValue zero_bits = RegisterValue(uint64_t(0)); - if (!WriteRegister(m_reg_info.first_dr + 6, zero_bits) || - !WriteRegister(m_reg_info.first_dr + 7, zero_bits)) - assert(false && "Could not initialize watchpoint registers"); - m_watchpoints_initialized = true; - } - - if (hw_index < NumSupportedHardwareWatchpoints()) { - RegisterValue value; - - if (ReadRegister(m_reg_info.first_dr + 6, value)) { - uint64_t val = value.GetAsUInt64(); - is_hit = val & (1 << hw_index); - } - } - - return is_hit; -} - -bool RegisterContextPOSIXProcessMonitor_x86_64::ClearWatchpointHits() { - return WriteRegister(m_reg_info.first_dr + 6, RegisterValue((uint64_t)0)); -} - -addr_t RegisterContextPOSIXProcessMonitor_x86_64::GetWatchpointAddress( - uint32_t hw_index) { - addr_t wp_monitor_addr = LLDB_INVALID_ADDRESS; - - if (hw_index < NumSupportedHardwareWatchpoints()) { - if (!IsWatchpointVacant(hw_index)) { - RegisterValue value; - - if (ReadRegister(m_reg_info.first_dr + hw_index, value)) - wp_monitor_addr = value.GetAsUInt64(); - } - } - - return wp_monitor_addr; -} - -bool RegisterContextPOSIXProcessMonitor_x86_64::IsWatchpointVacant( - uint32_t hw_index) { - bool is_vacant = false; - RegisterValue value; - - assert(hw_index < NumSupportedHardwareWatchpoints()); - - if (m_watchpoints_initialized == false) { - // Reset the debug status and debug control registers - RegisterValue zero_bits = RegisterValue(uint64_t(0)); - if (!WriteRegister(m_reg_info.first_dr + 6, zero_bits) || - !WriteRegister(m_reg_info.first_dr + 7, zero_bits)) - assert(false && "Could not initialize watchpoint registers"); - m_watchpoints_initialized = true; - } - - if (ReadRegister(m_reg_info.first_dr + 7, value)) { - uint64_t val = value.GetAsUInt64(); - is_vacant = (val & (3 << 2 * hw_index)) == 0; - } - - return is_vacant; -} - -bool RegisterContextPOSIXProcessMonitor_x86_64::SetHardwareWatchpointWithIndex( - addr_t addr, size_t size, bool read, bool write, uint32_t hw_index) { - const uint32_t num_hw_watchpoints = NumSupportedHardwareWatchpoints(); - - if (num_hw_watchpoints == 0 || hw_index >= num_hw_watchpoints) - return false; - - if (!(size == 1 || size == 2 || size == 4 || size == 8)) - return false; - - if (read == false && write == false) - return false; - - if (!IsWatchpointVacant(hw_index)) - return false; - - // Set both dr7 (debug control register) and dri (debug address register). - - // dr7{7-0} encodes the local/global enable bits: - // global enable --. .-- local enable - // | | - // v v - // dr0 -> bits{1-0} - // dr1 -> bits{3-2} - // dr2 -> bits{5-4} - // dr3 -> bits{7-6} - // - // dr7{31-16} encodes the rw/len bits: - // b_x+3, b_x+2, b_x+1, b_x - // where bits{x+1, x} => rw - // 0b00: execute, 0b01: write, 0b11: read-or-write, - // 0b10: io read-or-write (unused) - // and bits{x+3, x+2} => len - // 0b00: 1-byte, 0b01: 2-byte, 0b11: 4-byte, 0b10: 8-byte - // - // dr0 -> bits{19-16} - // dr1 -> bits{23-20} - // dr2 -> bits{27-24} - // dr3 -> bits{31-28} - if (hw_index < num_hw_watchpoints) { - RegisterValue current_dr7_bits; - - if (ReadRegister(m_reg_info.first_dr + 7, current_dr7_bits)) { - uint64_t new_dr7_bits = - current_dr7_bits.GetAsUInt64() | - (1 << (2 * hw_index) | - size_and_rw_bits(size, read, write) << (16 + 4 * hw_index)); - - if (WriteRegister(m_reg_info.first_dr + hw_index, RegisterValue(addr)) && - WriteRegister(m_reg_info.first_dr + 7, RegisterValue(new_dr7_bits))) - return true; - } - } - - return false; -} - -uint32_t -RegisterContextPOSIXProcessMonitor_x86_64::NumSupportedHardwareWatchpoints() { - // Available debug address registers: dr0, dr1, dr2, dr3 - return 4; -} |