660e34fd38
The PR adds the support optionally enabled/disabled FP-registers to LLDB `RegisterInfoPOSIX_riscv64`. This situation might take place for RISC-V builds having no FP-registers, like RV64IMAC or RV64IMACV. To aim this, patch adds `opt_regsets` flags mechanism. It re-works RegisterInfo class to work with flexibly allocated (depending on `opt_regsets` flag) `m_register_sets` and `m_register_infos` vectors instead of statically defined structures. The registration of regsets is being arranged by `m_per_regset_regnum_range` map. The patch flows are spread to `NativeRegisterContextLinux_riscv64` and `RegisterContextCorePOSIX_riscv64` classes, that were tested on: - x86_64 host working with coredumps - RV64GC and RV64IMAC targets working with coredumps and natively in run-time with binaries `EmulateInstructionRISCV` is out of scope of this patch, and its behavior did not change, using maximum set of registers. According testcase built for RV64IMAC (no-FPR) was added to `TestLinuxCore.py`.
377 lines
10 KiB
C++
377 lines
10 KiB
C++
//===-- NativeRegisterContextLinux_riscv64.cpp ----------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#if defined(__riscv) && __riscv_xlen == 64
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#include "NativeRegisterContextLinux_riscv64.h"
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#include "lldb/Host/HostInfo.h"
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#include "lldb/Utility/DataBufferHeap.h"
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#include "lldb/Utility/Log.h"
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#include "lldb/Utility/RegisterValue.h"
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#include "lldb/Utility/Status.h"
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#include "Plugins/Process/Linux/NativeProcessLinux.h"
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#include "Plugins/Process/Linux/Procfs.h"
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#include "Plugins/Process/Utility/RegisterInfoPOSIX_riscv64.h"
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#include "Plugins/Process/Utility/lldb-riscv-register-enums.h"
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// System includes - They have to be included after framework includes because
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// they define some macros which collide with variable names in other modules
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#include <sys/ptrace.h>
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#include <sys/uio.h>
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// NT_PRSTATUS and NT_FPREGSET definition
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#include <elf.h>
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using namespace lldb;
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using namespace lldb_private;
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using namespace lldb_private::process_linux;
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std::unique_ptr<NativeRegisterContextLinux>
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NativeRegisterContextLinux::CreateHostNativeRegisterContextLinux(
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const ArchSpec &target_arch, NativeThreadLinux &native_thread) {
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switch (target_arch.GetMachine()) {
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case llvm::Triple::riscv64: {
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Flags opt_regsets(RegisterInfoPOSIX_riscv64::eRegsetMaskDefault);
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RegisterInfoPOSIX_riscv64::FPR fpr;
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struct iovec ioVec;
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ioVec.iov_base = &fpr;
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ioVec.iov_len = sizeof(fpr);
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unsigned int regset = NT_FPREGSET;
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if (NativeProcessLinux::PtraceWrapper(PTRACE_GETREGSET,
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native_thread.GetID(), ®set,
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&ioVec, sizeof(fpr))
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.Success()) {
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opt_regsets.Set(RegisterInfoPOSIX_riscv64::eRegsetMaskFP);
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}
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auto register_info_up =
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std::make_unique<RegisterInfoPOSIX_riscv64>(target_arch, opt_regsets);
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return std::make_unique<NativeRegisterContextLinux_riscv64>(
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target_arch, native_thread, std::move(register_info_up));
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}
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default:
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llvm_unreachable("have no register context for architecture");
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}
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}
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llvm::Expected<ArchSpec>
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NativeRegisterContextLinux::DetermineArchitecture(lldb::tid_t tid) {
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return HostInfo::GetArchitecture();
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}
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NativeRegisterContextLinux_riscv64::NativeRegisterContextLinux_riscv64(
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const ArchSpec &target_arch, NativeThreadProtocol &native_thread,
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std::unique_ptr<RegisterInfoPOSIX_riscv64> register_info_up)
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: NativeRegisterContextRegisterInfo(native_thread,
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register_info_up.release()),
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NativeRegisterContextLinux(native_thread) {
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::memset(&m_fpr, 0, sizeof(m_fpr));
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::memset(&m_gpr, 0, sizeof(m_gpr));
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m_gpr_is_valid = false;
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m_fpu_is_valid = false;
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}
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const RegisterInfoPOSIX_riscv64 &
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NativeRegisterContextLinux_riscv64::GetRegisterInfo() const {
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return static_cast<const RegisterInfoPOSIX_riscv64 &>(
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NativeRegisterContextRegisterInfo::GetRegisterInfoInterface());
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}
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uint32_t NativeRegisterContextLinux_riscv64::GetRegisterSetCount() const {
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return GetRegisterInfo().GetRegisterSetCount();
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}
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const RegisterSet *
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NativeRegisterContextLinux_riscv64::GetRegisterSet(uint32_t set_index) const {
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return GetRegisterInfo().GetRegisterSet(set_index);
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}
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uint32_t NativeRegisterContextLinux_riscv64::GetUserRegisterCount() const {
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uint32_t count = 0;
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for (uint32_t set_index = 0; set_index < GetRegisterSetCount(); ++set_index)
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count += GetRegisterSet(set_index)->num_registers;
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return count;
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}
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Status
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NativeRegisterContextLinux_riscv64::ReadRegister(const RegisterInfo *reg_info,
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RegisterValue ®_value) {
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Status error;
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if (!reg_info) {
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error = Status::FromErrorString("reg_info NULL");
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return error;
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}
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const uint32_t reg = reg_info->kinds[lldb::eRegisterKindLLDB];
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if (reg == LLDB_INVALID_REGNUM)
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return Status::FromErrorStringWithFormat(
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"no lldb regnum for %s",
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reg_info && reg_info->name ? reg_info->name : "<unknown register>");
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if (reg == gpr_x0_riscv) {
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reg_value.SetUInt(0, reg_info->byte_size);
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return error;
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}
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uint8_t *src = nullptr;
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uint32_t offset = LLDB_INVALID_INDEX32;
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if (IsGPR(reg)) {
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error = ReadGPR();
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if (error.Fail())
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return error;
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offset = reg_info->byte_offset;
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assert(offset < GetGPRSize());
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src = (uint8_t *)GetGPRBuffer() + offset;
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} else if (IsFPR(reg)) {
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error = ReadFPR();
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if (error.Fail())
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return error;
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offset = CalculateFprOffset(reg_info);
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assert(offset < GetFPRSize());
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src = (uint8_t *)GetFPRBuffer() + offset;
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} else
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return Status::FromErrorString(
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"failed - register wasn't recognized to be a GPR or an FPR, "
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"write strategy unknown");
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reg_value.SetFromMemoryData(*reg_info, src, reg_info->byte_size,
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eByteOrderLittle, error);
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return error;
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}
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Status NativeRegisterContextLinux_riscv64::WriteRegister(
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const RegisterInfo *reg_info, const RegisterValue ®_value) {
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Status error;
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if (!reg_info)
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return Status::FromErrorString("reg_info NULL");
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const uint32_t reg = reg_info->kinds[lldb::eRegisterKindLLDB];
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if (reg == LLDB_INVALID_REGNUM)
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return Status::FromErrorStringWithFormat(
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"no lldb regnum for %s",
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reg_info->name != nullptr ? reg_info->name : "<unknown register>");
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if (reg == gpr_x0_riscv) {
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// do nothing.
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return error;
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}
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uint8_t *dst = nullptr;
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uint32_t offset = LLDB_INVALID_INDEX32;
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if (IsGPR(reg)) {
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error = ReadGPR();
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if (error.Fail())
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return error;
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assert(reg_info->byte_offset < GetGPRSize());
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dst = (uint8_t *)GetGPRBuffer() + reg_info->byte_offset;
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::memcpy(dst, reg_value.GetBytes(), reg_info->byte_size);
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return WriteGPR();
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} else if (IsFPR(reg)) {
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error = ReadFPR();
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if (error.Fail())
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return error;
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offset = CalculateFprOffset(reg_info);
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assert(offset < GetFPRSize());
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dst = (uint8_t *)GetFPRBuffer() + offset;
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::memcpy(dst, reg_value.GetBytes(), reg_info->byte_size);
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return WriteFPR();
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}
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return Status::FromErrorString("Failed to write register value");
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}
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Status NativeRegisterContextLinux_riscv64::ReadAllRegisterValues(
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lldb::WritableDataBufferSP &data_sp) {
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Status error;
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data_sp.reset(new DataBufferHeap(GetRegContextSize(), 0));
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error = ReadGPR();
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if (error.Fail())
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return error;
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if (GetRegisterInfo().IsFPPresent()) {
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error = ReadFPR();
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if (error.Fail())
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return error;
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}
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uint8_t *dst = const_cast<uint8_t *>(data_sp->GetBytes());
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::memcpy(dst, GetGPRBuffer(), GetGPRSize());
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dst += GetGPRSize();
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if (GetRegisterInfo().IsFPPresent())
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::memcpy(dst, GetFPRBuffer(), GetFPRSize());
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return error;
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}
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Status NativeRegisterContextLinux_riscv64::WriteAllRegisterValues(
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const lldb::DataBufferSP &data_sp) {
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Status error;
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if (!data_sp) {
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error = Status::FromErrorStringWithFormat(
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"NativeRegisterContextLinux_riscv64::%s invalid data_sp provided",
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__FUNCTION__);
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return error;
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}
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if (data_sp->GetByteSize() != GetRegContextSize()) {
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error = Status::FromErrorStringWithFormat(
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"NativeRegisterContextLinux_riscv64::%s data_sp contained mismatched "
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"data size, expected %" PRIu64 ", actual %" PRIu64,
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__FUNCTION__, GetRegContextSize(), data_sp->GetByteSize());
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return error;
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}
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uint8_t *src = const_cast<uint8_t *>(data_sp->GetBytes());
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if (src == nullptr) {
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error = Status::FromErrorStringWithFormat(
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"NativeRegisterContextLinux_riscv64::%s "
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"DataBuffer::GetBytes() returned a null "
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"pointer",
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__FUNCTION__);
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return error;
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}
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::memcpy(GetGPRBuffer(), src, GetRegisterInfoInterface().GetGPRSize());
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error = WriteGPR();
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if (error.Fail())
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return error;
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src += GetRegisterInfoInterface().GetGPRSize();
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if (GetRegisterInfo().IsFPPresent()) {
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::memcpy(GetFPRBuffer(), src, GetFPRSize());
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error = WriteFPR();
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if (error.Fail())
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return error;
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}
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return error;
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}
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size_t NativeRegisterContextLinux_riscv64::GetRegContextSize() {
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size_t size = GetGPRSize();
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if (GetRegisterInfo().IsFPPresent())
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size += GetFPRSize();
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return size;
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}
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bool NativeRegisterContextLinux_riscv64::IsGPR(unsigned reg) const {
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return GetRegisterInfo().GetRegisterSetFromRegisterIndex(reg) ==
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RegisterInfoPOSIX_riscv64::GPRegSet;
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}
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bool NativeRegisterContextLinux_riscv64::IsFPR(unsigned reg) const {
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return GetRegisterInfo().IsFPReg(reg);
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}
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Status NativeRegisterContextLinux_riscv64::ReadGPR() {
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Status error;
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if (m_gpr_is_valid)
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return error;
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struct iovec ioVec;
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ioVec.iov_base = GetGPRBuffer();
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ioVec.iov_len = GetGPRSize();
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error = ReadRegisterSet(&ioVec, GetGPRSize(), NT_PRSTATUS);
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if (error.Success())
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m_gpr_is_valid = true;
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return error;
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}
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Status NativeRegisterContextLinux_riscv64::WriteGPR() {
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Status error = ReadGPR();
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if (error.Fail())
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return error;
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struct iovec ioVec;
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ioVec.iov_base = GetGPRBuffer();
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ioVec.iov_len = GetGPRSize();
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m_gpr_is_valid = false;
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return WriteRegisterSet(&ioVec, GetGPRSize(), NT_PRSTATUS);
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}
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Status NativeRegisterContextLinux_riscv64::ReadFPR() {
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Status error;
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if (m_fpu_is_valid)
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return error;
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struct iovec ioVec;
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ioVec.iov_base = GetFPRBuffer();
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ioVec.iov_len = GetFPRSize();
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error = ReadRegisterSet(&ioVec, GetFPRSize(), NT_FPREGSET);
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if (error.Success())
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m_fpu_is_valid = true;
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return error;
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}
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Status NativeRegisterContextLinux_riscv64::WriteFPR() {
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Status error = ReadFPR();
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if (error.Fail())
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return error;
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struct iovec ioVec;
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ioVec.iov_base = GetFPRBuffer();
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ioVec.iov_len = GetFPRSize();
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m_fpu_is_valid = false;
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return WriteRegisterSet(&ioVec, GetFPRSize(), NT_FPREGSET);
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}
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void NativeRegisterContextLinux_riscv64::InvalidateAllRegisters() {
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m_gpr_is_valid = false;
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m_fpu_is_valid = false;
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}
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uint32_t NativeRegisterContextLinux_riscv64::CalculateFprOffset(
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const RegisterInfo *reg_info) const {
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return reg_info->byte_offset - GetGPRSize();
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}
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std::vector<uint32_t> NativeRegisterContextLinux_riscv64::GetExpeditedRegisters(
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ExpeditedRegs expType) const {
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std::vector<uint32_t> expedited_reg_nums =
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NativeRegisterContext::GetExpeditedRegisters(expType);
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return expedited_reg_nums;
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}
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#endif // defined (__riscv) && __riscv_xlen == 64
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