d26ca8b872
This will be used to detect the presence of Arm's new Memory Tagging store only checking feature. This commit just adds the plumbing to get that value into the detection function. FreeBSD has not allocated a number for HWCAP3 and already has AT_ARGV defined as 29. So instead of attempting to read from FreeBSD processes, I've explicitly passed 0. We don't want to be reading some other entry accidentally. If/when FreeBSD adds HWCAP3 we can handle it like we do for AUXV_FREEBSD_AT_HWCAP. No extra tests here, those will be coming with the next change for MTE support.
100 lines
3.7 KiB
C++
100 lines
3.7 KiB
C++
//===-- AuxVector.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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#include "AuxVector.h"
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#include <optional>
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AuxVector::AuxVector(const lldb_private::DataExtractor &data) {
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ParseAuxv(data);
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}
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void AuxVector::ParseAuxv(const lldb_private::DataExtractor &data) {
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lldb::offset_t offset = 0;
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const size_t value_type_size = data.GetAddressByteSize() * 2;
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while (data.ValidOffsetForDataOfSize(offset, value_type_size)) {
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// We're not reading an address but an int that could be 32 or 64 bit
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// depending on the address size, which is what GetAddress does.
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const uint64_t type = data.GetAddress(&offset);
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const uint64_t value = data.GetAddress(&offset);
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if (type == AUXV_AT_NULL)
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break;
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if (type == AUXV_AT_IGNORE)
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continue;
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m_auxv_entries[type] = value;
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}
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}
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std::optional<uint64_t>
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AuxVector::GetAuxValue(enum EntryType entry_type) const {
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auto it = m_auxv_entries.find(static_cast<uint64_t>(entry_type));
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if (it != m_auxv_entries.end())
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return it->second;
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return std::nullopt;
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}
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void AuxVector::DumpToLog(lldb_private::Log *log) const {
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if (!log)
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return;
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log->PutCString("AuxVector: ");
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for (auto entry : m_auxv_entries) {
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LLDB_LOGF(log, " %s [%" PRIu64 "]: %" PRIx64,
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GetEntryName(static_cast<EntryType>(entry.first)), entry.first,
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entry.second);
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}
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}
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const char *AuxVector::GetEntryName(EntryType type) const {
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const char *name = "AT_???";
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#define ENTRY_NAME(_type) \
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_type: \
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name = &#_type[5]
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switch (type) {
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case ENTRY_NAME(AUXV_AT_NULL); break;
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case ENTRY_NAME(AUXV_AT_IGNORE); break;
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case ENTRY_NAME(AUXV_AT_EXECFD); break;
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case ENTRY_NAME(AUXV_AT_PHDR); break;
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case ENTRY_NAME(AUXV_AT_PHENT); break;
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case ENTRY_NAME(AUXV_AT_PHNUM); break;
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case ENTRY_NAME(AUXV_AT_PAGESZ); break;
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case ENTRY_NAME(AUXV_AT_BASE); break;
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case ENTRY_NAME(AUXV_AT_FLAGS); break;
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case ENTRY_NAME(AUXV_AT_ENTRY); break;
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case ENTRY_NAME(AUXV_AT_NOTELF); break;
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case ENTRY_NAME(AUXV_AT_UID); break;
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case ENTRY_NAME(AUXV_AT_EUID); break;
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case ENTRY_NAME(AUXV_AT_GID); break;
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case ENTRY_NAME(AUXV_AT_EGID); break;
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case ENTRY_NAME(AUXV_AT_CLKTCK); break;
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case ENTRY_NAME(AUXV_AT_PLATFORM); break;
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case ENTRY_NAME(AUXV_AT_HWCAP); break;
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case ENTRY_NAME(AUXV_AT_FPUCW); break;
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case ENTRY_NAME(AUXV_AT_DCACHEBSIZE); break;
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case ENTRY_NAME(AUXV_AT_ICACHEBSIZE); break;
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case ENTRY_NAME(AUXV_AT_UCACHEBSIZE); break;
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case ENTRY_NAME(AUXV_AT_IGNOREPPC); break;
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case ENTRY_NAME(AUXV_AT_SECURE); break;
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case ENTRY_NAME(AUXV_AT_BASE_PLATFORM); break;
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case ENTRY_NAME(AUXV_AT_RANDOM); break;
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case ENTRY_NAME(AUXV_AT_HWCAP2); break;
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case ENTRY_NAME(AUXV_AT_HWCAP3); break;
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case ENTRY_NAME(AUXV_AT_EXECFN); break;
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case ENTRY_NAME(AUXV_AT_SYSINFO); break;
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case ENTRY_NAME(AUXV_AT_SYSINFO_EHDR); break;
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case ENTRY_NAME(AUXV_AT_L1I_CACHESHAPE); break;
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case ENTRY_NAME(AUXV_AT_L1D_CACHESHAPE); break;
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case ENTRY_NAME(AUXV_AT_L2_CACHESHAPE); break;
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case ENTRY_NAME(AUXV_AT_L3_CACHESHAPE); break;
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}
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#undef ENTRY_NAME
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return name;
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}
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