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//===-- NativeRegisterContextLinux.h ----------------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
#ifndef lldb_NativeRegisterContextLinux_h
#define lldb_NativeRegisterContextLinux_h
#include "Plugins/Process/Utility/NativeRegisterContextRegisterInfo.h"
#include "lldb/Host/common/NativeThreadProtocol.h"
#include "lldb/Target/MemoryTagManager.h"
#include "llvm/Support/Error.h"
#include <optional>
namespace lldb_private {
namespace process_linux {
class NativeThreadLinux;
class NativeRegisterContextLinux
: public virtual NativeRegisterContextRegisterInfo {
public:
// These static methods are implemented individual
// NativeRegisterContextLinux_* subclasses. The implementations can't collide
// as only one NativeRegisterContextLinux_* variant should be compiled into
// the final executable.
// Return a NativeRegisterContextLinux instance suitable for debugging the
// given thread.
static std::unique_ptr<NativeRegisterContextLinux>
CreateHostNativeRegisterContextLinux(const ArchSpec &target_arch,
NativeThreadLinux &native_thread);
// Determine the architecture of the thread given by its ID.
static llvm::Expected<ArchSpec> DetermineArchitecture(lldb::tid_t tid);
// Invalidates cached values in register context data structures
virtual void InvalidateAllRegisters(){}
struct SyscallData {
/// The syscall instruction. If the architecture uses software
/// single-stepping, the instruction should also be followed by a trap to
/// ensure the process is stopped after the syscall.
llvm::ArrayRef<uint8_t> Insn;
/// Registers used for syscall arguments. The first register is used to
/// store the syscall number.
llvm::ArrayRef<uint32_t> Args;
uint32_t Result; ///< Register containing the syscall result.
};
/// Return architecture-specific data needed to make inferior syscalls, if
/// they are supported.
virtual std::optional<SyscallData> GetSyscallData() { return std::nullopt; }
struct MmapData {
// Syscall numbers can be found (e.g.) in /usr/include/asm/unistd.h for the
// relevant architecture.
unsigned SysMmap; ///< mmap syscall number.
unsigned SysMunmap; ///< munmap syscall number
};
/// Return the architecture-specific data needed to make mmap syscalls, if
/// they are supported.
virtual std::optional<MmapData> GetMmapData() { return std::nullopt; }
struct MemoryTaggingDetails {
/// Object with tag handling utilities. If the function below returns
/// a valid structure, you can assume that this pointer is valid.
std::unique_ptr<MemoryTagManager> manager;
int ptrace_read_req; /// ptrace operation number for memory tag read
int ptrace_write_req; /// ptrace operation number for memory tag write
};
/// Return architecture specific data needed to use memory tags,
/// if they are supported.
virtual llvm::Expected<MemoryTaggingDetails>
GetMemoryTaggingDetails(int32_t type) {
return llvm::createStringError(
llvm::inconvertibleErrorCode(),
"Architecture does not support memory tagging");
}
protected:
// NB: This constructor is here only because gcc<=6.5 requires a virtual base
// class initializer on abstract class (even though it is never used). It can
// be deleted once we move to gcc>=7.0.
NativeRegisterContextLinux(NativeThreadProtocol &thread)
: NativeRegisterContextRegisterInfo(thread, nullptr) {}
lldb::ByteOrder GetByteOrder() const;
virtual Status ReadRegisterRaw(uint32_t reg_index, RegisterValue ®_value);
virtual Status WriteRegisterRaw(uint32_t reg_index,
const RegisterValue ®_value);
virtual Status ReadRegisterSet(void *buf, size_t buf_size,
unsigned int regset);
virtual Status WriteRegisterSet(void *buf, size_t buf_size,
unsigned int regset);
virtual Status ReadGPR();
virtual Status WriteGPR();
virtual Status ReadFPR();
virtual Status WriteFPR();
virtual void *GetGPRBuffer() = 0;
virtual size_t GetGPRSize() const {
return GetRegisterInfoInterface().GetGPRSize();
}
virtual void *GetFPRBuffer() = 0;
virtual size_t GetFPRSize() = 0;
virtual uint32_t GetPtraceOffset(uint32_t reg_index) {
return GetRegisterInfoAtIndex(reg_index)->byte_offset;
}
// The Do*** functions are executed on the privileged thread and can perform
// ptrace
// operations directly.
virtual Status DoReadRegisterValue(uint32_t offset, const char *reg_name,
uint32_t size, RegisterValue &value);
virtual Status DoWriteRegisterValue(uint32_t offset, const char *reg_name,
const RegisterValue &value);
// Determine the architecture via GPR size, as reported by
// PTRACE_GETREGSET(NT_PRSTATUS).
static llvm::Expected<ArchSpec>
DetermineArchitectureViaGPR(lldb::tid_t tid, size_t gpr64_size);
};
} // namespace process_linux
} // namespace lldb_private
#endif // #ifndef lldb_NativeRegisterContextLinux_h
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