This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rG8f2ffb1cf31f: [lldb][AArch64] Add type marker to
ReadAll/WriteALLRegisterValues data (authored by DavidSpickett).
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D156687/new/
https://reviews.llvm.org/D156687
Files:
lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_arm64.cpp
lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_arm64.h
Index: lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_arm64.h
===================================================================
--- lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_arm64.h
+++ lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_arm64.h
@@ -181,6 +181,8 @@
void ConfigureRegisterContext();
uint32_t CalculateSVEOffset(const RegisterInfo *reg_info) const;
+
+ Status CacheAllRegisters(uint32_t &cached_size);
};
} // namespace process_linux
Index: lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_arm64.cpp
===================================================================
--- lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_arm64.cpp
+++ lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_arm64.cpp
@@ -499,76 +499,119 @@
return Status("Failed to write register value");
}
-Status NativeRegisterContextLinux_arm64::ReadAllRegisterValues(
- lldb::WritableDataBufferSP &data_sp) {
- // AArch64 register data must contain GPRs and either FPR or SVE registers.
- // SVE registers can be non-streaming (aka SVE) or streaming (aka SSVE).
- // Finally an optional MTE register. Pointer Authentication (PAC) registers
- // are read-only and will be skipped.
+enum RegisterSetType : uint32_t {
+ GPR,
+ SVE, // Used for SVE and SSVE.
+ FPR, // When there is no SVE, or SVE in FPSIMD mode.
+ MTE,
+ TLS,
+};
+
+static uint8_t *AddRegisterSetType(uint8_t *dst,
+ RegisterSetType register_set_type) {
+ *(reinterpret_cast<uint32_t *>(dst)) = register_set_type;
+ return dst + sizeof(uint32_t);
+}
- // In order to create register data checkpoint we first read all register
- // values if not done already and calculate total size of register set data.
- // We store all register values in data_sp by copying full PTrace data that
- // corresponds to register sets enabled by current register context.
+static uint8_t *AddSavedRegistersData(uint8_t *dst, void *src, size_t size) {
+ ::memcpy(dst, src, size);
+ return dst + size;
+}
+static uint8_t *AddSavedRegisters(uint8_t *dst,
+ enum RegisterSetType register_set_type,
+ void *src, size_t size) {
+ dst = AddRegisterSetType(dst, register_set_type);
+ return AddSavedRegistersData(dst, src, size);
+}
+
+Status
+NativeRegisterContextLinux_arm64::CacheAllRegisters(uint32_t &cached_size) {
Status error;
- uint32_t reg_data_byte_size = GetGPRBufferSize();
+ cached_size = sizeof(RegisterSetType) + GetGPRBufferSize();
error = ReadGPR();
if (error.Fail())
return error;
// If SVE is enabled we need not copy FPR separately.
if (GetRegisterInfo().IsSVEEnabled() || GetRegisterInfo().IsSSVEEnabled()) {
- reg_data_byte_size += GetSVEBufferSize();
- // Also store the current SVE mode.
- reg_data_byte_size += sizeof(uint32_t);
+ // Store mode and register data.
+ cached_size +=
+ sizeof(RegisterSetType) + sizeof(m_sve_state) + GetSVEBufferSize();
error = ReadAllSVE();
} else {
- reg_data_byte_size += GetFPRSize();
+ cached_size += sizeof(RegisterSetType) + GetFPRSize();
error = ReadFPR();
}
if (error.Fail())
return error;
if (GetRegisterInfo().IsMTEEnabled()) {
- reg_data_byte_size += GetMTEControlSize();
+ cached_size += sizeof(RegisterSetType) + GetMTEControlSize();
error = ReadMTEControl();
if (error.Fail())
return error;
}
// tpidr is always present but tpidr2 depends on SME.
- reg_data_byte_size += GetTLSBufferSize();
+ cached_size += sizeof(RegisterSetType) + GetTLSBufferSize();
error = ReadTLS();
+
+ return error;
+}
+
+Status NativeRegisterContextLinux_arm64::ReadAllRegisterValues(
+ lldb::WritableDataBufferSP &data_sp) {
+ // AArch64 register data must contain GPRs and either FPR or SVE registers.
+ // SVE registers can be non-streaming (aka SVE) or streaming (aka SSVE).
+ // Finally an optional MTE register. Pointer Authentication (PAC) registers
+ // are read-only and will be skipped.
+
+ // In order to create register data checkpoint we first read all register
+ // values if not done already and calculate total size of register set data.
+ // We store all register values in data_sp by copying full PTrace data that
+ // corresponds to register sets enabled by current register context.
+
+ uint32_t reg_data_byte_size = 0;
+ Status error = CacheAllRegisters(reg_data_byte_size);
if (error.Fail())
return error;
data_sp.reset(new DataBufferHeap(reg_data_byte_size, 0));
uint8_t *dst = data_sp->GetBytes();
- ::memcpy(dst, GetGPRBuffer(), GetGPRBufferSize());
- dst += GetGPRBufferSize();
+ dst = AddSavedRegisters(dst, RegisterSetType::GPR, GetGPRBuffer(),
+ GetGPRBufferSize());
if (GetRegisterInfo().IsSVEEnabled() || GetRegisterInfo().IsSSVEEnabled()) {
- *dst = static_cast<uint8_t>(m_sve_state);
+ dst = AddRegisterSetType(dst, RegisterSetType::SVE);
+ *(reinterpret_cast<SVEState *>(dst)) = m_sve_state;
dst += sizeof(m_sve_state);
- ::memcpy(dst, GetSVEBuffer(), GetSVEBufferSize());
- dst += GetSVEBufferSize();
+ dst = AddSavedRegistersData(dst, GetSVEBuffer(), GetSVEBufferSize());
} else {
- ::memcpy(dst, GetFPRBuffer(), GetFPRSize());
- dst += GetFPRSize();
+ dst = AddSavedRegisters(dst, RegisterSetType::FPR, GetFPRBuffer(),
+ GetFPRSize());
}
if (GetRegisterInfo().IsMTEEnabled()) {
- ::memcpy(dst, GetMTEControl(), GetMTEControlSize());
- dst += GetMTEControlSize();
+ dst = AddSavedRegisters(dst, RegisterSetType::MTE, GetMTEControl(),
+ GetMTEControlSize());
}
- ::memcpy(dst, GetTLSBuffer(), GetTLSBufferSize());
+ dst = AddSavedRegisters(dst, RegisterSetType::TLS, GetTLSBuffer(),
+ GetTLSBufferSize());
return error;
}
+static Status RestoreRegisters(void *buffer, const uint8_t **src, size_t len,
+ bool &is_valid, std::function<Status()> writer) {
+ ::memcpy(buffer, *src, len);
+ is_valid = true;
+ *src += len;
+ return writer();
+}
+
Status NativeRegisterContextLinux_arm64::WriteAllRegisterValues(
const lldb::DataBufferSP &data_sp) {
// AArch64 register data must contain GPRs, either FPR or SVE registers
@@ -599,7 +642,8 @@
return error;
}
- uint64_t reg_data_min_size = GetGPRBufferSize() + GetFPRSize();
+ uint64_t reg_data_min_size =
+ GetGPRBufferSize() + GetFPRSize() + 2 * (sizeof(RegisterSetType));
if (data_sp->GetByteSize() < reg_data_min_size) {
error.SetErrorStringWithFormat(
"NativeRegisterContextLinux_arm64::%s data_sp contained insufficient "
@@ -608,82 +652,67 @@
return error;
}
- // Register data starts with GPRs
- ::memcpy(GetGPRBuffer(), src, GetGPRBufferSize());
- m_gpr_is_valid = true;
-
- error = WriteGPR();
- if (error.Fail())
- return error;
-
- src += GetGPRBufferSize();
-
- // Verify if register data may contain SVE register values.
- bool contains_sve_reg_data =
- (data_sp->GetByteSize() > (reg_data_min_size + GetSVEHeaderSize()));
-
- if (contains_sve_reg_data) {
- // Restore to the correct mode, streaming or not.
- m_sve_state = static_cast<SVEState>(*src);
- src += sizeof(m_sve_state);
-
- // We have SVE register data first write SVE header.
- ::memcpy(GetSVEHeader(), src, GetSVEHeaderSize());
- if (!sve::vl_valid(m_sve_header.vl)) {
- m_sve_header_is_valid = false;
- error.SetErrorStringWithFormat("NativeRegisterContextLinux_arm64::%s "
- "Invalid SVE header in data_sp",
- __FUNCTION__);
- return error;
- }
- m_sve_header_is_valid = true;
- error = WriteSVEHeader();
- if (error.Fail())
- return error;
-
- // SVE header has been written configure SVE vector length if needed.
- ConfigureRegisterContext();
+ const uint8_t *end = src + data_sp->GetByteSize();
+ while (src < end) {
+ const RegisterSetType kind =
+ *reinterpret_cast<const RegisterSetType *>(src);
+ src += sizeof(RegisterSetType);
+
+ switch (kind) {
+ case RegisterSetType::GPR:
+ error = RestoreRegisters(
+ GetGPRBuffer(), &src, GetGPRBufferSize(), m_gpr_is_valid,
+ std::bind(&NativeRegisterContextLinux_arm64::WriteGPR, this));
+ break;
+ case RegisterSetType::SVE:
+ // Restore to the correct mode, streaming or not.
+ m_sve_state = static_cast<SVEState>(*src);
+ src += sizeof(m_sve_state);
+
+ // First write SVE header. We do not use RestoreRegisters because we do
+ // not want src to be modified yet.
+ ::memcpy(GetSVEHeader(), src, GetSVEHeaderSize());
+ if (!sve::vl_valid(m_sve_header.vl)) {
+ m_sve_header_is_valid = false;
+ error.SetErrorStringWithFormat("NativeRegisterContextLinux_arm64::%s "
+ "Invalid SVE header in data_sp",
+ __FUNCTION__);
+ return error;
+ }
+ m_sve_header_is_valid = true;
+ error = WriteSVEHeader();
+ if (error.Fail())
+ return error;
- // Make sure data_sp contains sufficient data to write all SVE registers.
- reg_data_min_size = GetGPRBufferSize() + GetSVEBufferSize();
- if (data_sp->GetByteSize() < reg_data_min_size) {
- error.SetErrorStringWithFormat(
- "NativeRegisterContextLinux_arm64::%s data_sp contained insufficient "
- "register data bytes, expected %" PRIu64 ", actual %" PRIu64,
- __FUNCTION__, reg_data_min_size, data_sp->GetByteSize());
- return error;
+ // SVE header has been written configure SVE vector length if needed.
+ ConfigureRegisterContext();
+
+ // Write header and register data, incrementing src this time.
+ error = RestoreRegisters(
+ GetSVEBuffer(), &src, GetSVEBufferSize(), m_sve_buffer_is_valid,
+ std::bind(&NativeRegisterContextLinux_arm64::WriteAllSVE, this));
+ break;
+ case RegisterSetType::FPR:
+ error = RestoreRegisters(
+ GetFPRBuffer(), &src, GetFPRSize(), m_fpu_is_valid,
+ std::bind(&NativeRegisterContextLinux_arm64::WriteFPR, this));
+ break;
+ case RegisterSetType::MTE:
+ error = RestoreRegisters(
+ GetMTEControl(), &src, GetMTEControlSize(), m_mte_ctrl_is_valid,
+ std::bind(&NativeRegisterContextLinux_arm64::WriteMTEControl, this));
+ break;
+ case RegisterSetType::TLS:
+ error = RestoreRegisters(
+ GetTLSBuffer(), &src, GetTLSBufferSize(), m_tls_is_valid,
+ std::bind(&NativeRegisterContextLinux_arm64::WriteTLS, this));
+ break;
}
- ::memcpy(GetSVEBuffer(), src, GetSVEBufferSize());
- m_sve_buffer_is_valid = true;
- error = WriteAllSVE();
- src += GetSVEBufferSize();
- } else {
- ::memcpy(GetFPRBuffer(), src, GetFPRSize());
- m_fpu_is_valid = true;
- error = WriteFPR();
- src += GetFPRSize();
- }
-
- if (error.Fail())
- return error;
-
- if (GetRegisterInfo().IsMTEEnabled() &&
- data_sp->GetByteSize() > reg_data_min_size) {
- ::memcpy(GetMTEControl(), src, GetMTEControlSize());
- m_mte_ctrl_is_valid = true;
- error = WriteMTEControl();
if (error.Fail())
return error;
- src += GetMTEControlSize();
}
- // There is always a TLS set. It changes size based on system properties, it's
- // not something an expression can change.
- ::memcpy(GetTLSBuffer(), src, GetTLSBufferSize());
- m_tls_is_valid = true;
- error = WriteTLS();
-
return error;
}
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