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[LLDB] On AArch64, reconfigure register context first #70742

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Oct 31, 2023
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[LLDB] On AArch64, reconfigure register context first #70742

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34 changes: 16 additions & 18 deletions lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1642,9 +1642,22 @@ ThreadSP ProcessGDBRemote::SetThreadStopInfo(
}

ThreadGDBRemote *gdb_thread = static_cast<ThreadGDBRemote *>(thread_sp.get());
RegisterContextSP gdb_reg_ctx_sp(gdb_thread->GetRegisterContext());
RegisterContextSP reg_ctx_sp(gdb_thread->GetRegisterContext());

gdb_reg_ctx_sp->InvalidateIfNeeded(true);
reg_ctx_sp->InvalidateIfNeeded(true);

// AArch64 SVE/SME specific code below updates SVE and ZA register sizes and
// offsets if value of VG or SVG registers has changed since last stop.
const ArchSpec &arch = GetTarget().GetArchitecture();
if (arch.IsValid() && arch.GetTriple().isAArch64()) {
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GDBRemoteRegisterContext *gdb_remote_reg_ctx =
static_cast<GDBRemoteRegisterContext *>(reg_ctx_sp.get());

if (gdb_remote_reg_ctx) {
gdb_remote_reg_ctx->AArch64Reconfigure();
gdb_remote_reg_ctx->InvalidateAllRegisters();
}
}

auto iter = std::find(m_thread_ids.begin(), m_thread_ids.end(), tid);
if (iter != m_thread_ids.end())
Expand All @@ -1655,25 +1668,10 @@ ThreadSP ProcessGDBRemote::SetThreadStopInfo(
WritableDataBufferSP buffer_sp(
new DataBufferHeap(reg_value_extractor.GetStringRef().size() / 2, 0));
reg_value_extractor.GetHexBytes(buffer_sp->GetData(), '\xcc');
uint32_t lldb_regnum = gdb_reg_ctx_sp->ConvertRegisterKindToRegisterNumber(
uint32_t lldb_regnum = reg_ctx_sp->ConvertRegisterKindToRegisterNumber(
eRegisterKindProcessPlugin, pair.first);
gdb_thread->PrivateSetRegisterValue(lldb_regnum, buffer_sp->GetData());
}

// AArch64 SVE/SME specific code below updates SVE and ZA register sizes and
// offsets if value of VG or SVG registers has changed since last stop.
const ArchSpec &arch = GetTarget().GetArchitecture();
if (arch.IsValid() && arch.GetTriple().isAArch64()) {
GDBRemoteRegisterContext *reg_ctx_sp =
static_cast<GDBRemoteRegisterContext *>(
gdb_thread->GetRegisterContext().get());

if (reg_ctx_sp) {
reg_ctx_sp->AArch64Reconfigure();
reg_ctx_sp->InvalidateAllRegisters();
}
}

thread_sp->SetName(thread_name.empty() ? nullptr : thread_name.c_str());

gdb_thread->SetThreadDispatchQAddr(thread_dispatch_qaddr);
Expand Down