NativeRegisterContextLinux.cpp
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//===-- NativeRegisterContextLinux.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 "NativeRegisterContextLinux.h"
#include "lldb/Host/common/NativeProcessProtocol.h"
#include "lldb/Host/common/NativeThreadProtocol.h"
#include "lldb/Host/linux/Ptrace.h"
#include "lldb/Utility/RegisterValue.h"
#include "Plugins/Process/Linux/NativeProcessLinux.h"
#include "Plugins/Process/POSIX/ProcessPOSIXLog.h"
using namespace lldb_private;
using namespace lldb_private::process_linux;
NativeRegisterContextLinux::NativeRegisterContextLinux(
NativeThreadProtocol &native_thread,
RegisterInfoInterface *reg_info_interface_p)
: NativeRegisterContextRegisterInfo(native_thread, reg_info_interface_p) {}
lldb::ByteOrder NativeRegisterContextLinux::GetByteOrder() const {
return m_thread.GetProcess().GetByteOrder();
}
Status NativeRegisterContextLinux::ReadRegisterRaw(uint32_t reg_index,
RegisterValue ®_value) {
const RegisterInfo *const reg_info = GetRegisterInfoAtIndex(reg_index);
if (!reg_info)
return Status("register %" PRIu32 " not found", reg_index);
return DoReadRegisterValue(GetPtraceOffset(reg_index), reg_info->name,
reg_info->byte_size, reg_value);
}
Status
NativeRegisterContextLinux::WriteRegisterRaw(uint32_t reg_index,
const RegisterValue ®_value) {
uint32_t reg_to_write = reg_index;
RegisterValue value_to_write = reg_value;
// Check if this is a subregister of a full register.
const RegisterInfo *reg_info = GetRegisterInfoAtIndex(reg_index);
if (reg_info->invalidate_regs &&
(reg_info->invalidate_regs[0] != LLDB_INVALID_REGNUM)) {
Status error;
RegisterValue full_value;
uint32_t full_reg = reg_info->invalidate_regs[0];
const RegisterInfo *full_reg_info = GetRegisterInfoAtIndex(full_reg);
// Read the full register.
error = ReadRegister(full_reg_info, full_value);
if (error.Fail())
return error;
lldb::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 = reg_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;
}
}
}
const RegisterInfo *const register_to_write_info_p =
GetRegisterInfoAtIndex(reg_to_write);
assert(register_to_write_info_p &&
"register to write does not have valid RegisterInfo");
if (!register_to_write_info_p)
return Status("NativeRegisterContextLinux::%s failed to get RegisterInfo "
"for write register index %" PRIu32,
__FUNCTION__, reg_to_write);
return DoWriteRegisterValue(GetPtraceOffset(reg_index), reg_info->name,
reg_value);
}
Status NativeRegisterContextLinux::ReadGPR() {
return NativeProcessLinux::PtraceWrapper(
PTRACE_GETREGS, m_thread.GetID(), nullptr, GetGPRBuffer(), GetGPRSize());
}
Status NativeRegisterContextLinux::WriteGPR() {
return NativeProcessLinux::PtraceWrapper(
PTRACE_SETREGS, m_thread.GetID(), nullptr, GetGPRBuffer(), GetGPRSize());
}
Status NativeRegisterContextLinux::ReadFPR() {
return NativeProcessLinux::PtraceWrapper(PTRACE_GETFPREGS, m_thread.GetID(),
nullptr, GetFPRBuffer(),
GetFPRSize());
}
Status NativeRegisterContextLinux::WriteFPR() {
return NativeProcessLinux::PtraceWrapper(PTRACE_SETFPREGS, m_thread.GetID(),
nullptr, GetFPRBuffer(),
GetFPRSize());
}
Status NativeRegisterContextLinux::ReadRegisterSet(void *buf, size_t buf_size,
unsigned int regset) {
return NativeProcessLinux::PtraceWrapper(PTRACE_GETREGSET, m_thread.GetID(),
static_cast<void *>(®set), buf,
buf_size);
}
Status NativeRegisterContextLinux::WriteRegisterSet(void *buf, size_t buf_size,
unsigned int regset) {
return NativeProcessLinux::PtraceWrapper(PTRACE_SETREGSET, m_thread.GetID(),
static_cast<void *>(®set), buf,
buf_size);
}
Status NativeRegisterContextLinux::DoReadRegisterValue(uint32_t offset,
const char *reg_name,
uint32_t size,
RegisterValue &value) {
Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_REGISTERS));
long data;
Status error = NativeProcessLinux::PtraceWrapper(
PTRACE_PEEKUSER, m_thread.GetID(), reinterpret_cast<void *>(offset),
nullptr, 0, &data);
if (error.Success())
// First cast to an unsigned of the same size to avoid sign extension.
value.SetUInt(static_cast<unsigned long>(data), size);
LLDB_LOG(log, "{0}: {1:x}", reg_name, data);
return error;
}
Status NativeRegisterContextLinux::DoWriteRegisterValue(
uint32_t offset, const char *reg_name, const RegisterValue &value) {
Log *log(ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_REGISTERS));
void *buf = reinterpret_cast<void *>(value.GetAsUInt64());
LLDB_LOG(log, "{0}: {1}", reg_name, buf);
return NativeProcessLinux::PtraceWrapper(
PTRACE_POKEUSER, m_thread.GetID(), reinterpret_cast<void *>(offset), buf);
}