This revision was automatically updated to reflect the committed changes.
Closed by commit rGb6f9d7b8fb2e: Cleanup and speedup
NativeRegisterContextLinux_arm64 (authored by omjavaid).
Herald added a project: LLDB.
Changed prior to commit:
https://reviews.llvm.org/D69371?vs=232501&id=232586#toc
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D69371/new/
https://reviews.llvm.org/D69371
Files:
lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux.h
lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_arm64.cpp
lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_arm64.h
lldb/source/Plugins/Process/Linux/NativeThreadLinux.cpp
Index: lldb/source/Plugins/Process/Linux/NativeThreadLinux.cpp
===================================================================
--- lldb/source/Plugins/Process/Linux/NativeThreadLinux.cpp
+++ lldb/source/Plugins/Process/Linux/NativeThreadLinux.cpp
@@ -241,6 +241,9 @@
if (signo != LLDB_INVALID_SIGNAL_NUMBER)
data = signo;
+ // Before thread resumes, clear any cached register data structures
+ GetRegisterContext().InvalidateAllRegisters();
+
return NativeProcessLinux::PtraceWrapper(PTRACE_CONT, GetID(), nullptr,
reinterpret_cast<void *>(data));
}
@@ -262,6 +265,9 @@
if (signo != LLDB_INVALID_SIGNAL_NUMBER)
data = signo;
+ // Before thread resumes, clear any cached register data structures
+ GetRegisterContext().InvalidateAllRegisters();
+
// If hardware single-stepping is not supported, we just do a continue. The
// breakpoint on the next instruction has been setup in
// NativeProcessLinux::Resume.
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
@@ -40,6 +40,8 @@
Status WriteAllRegisterValues(const lldb::DataBufferSP &data_sp) override;
+ void InvalidateAllRegisters() override;
+
// Hardware breakpoints/watchpoint management functions
uint32_t NumSupportedHardwareBreakpoints() override;
@@ -77,11 +79,6 @@
enum DREGType { eDREGTypeWATCH = 0, eDREGTypeBREAK };
protected:
- Status DoReadRegisterValue(uint32_t offset, const char *reg_name,
- uint32_t size, RegisterValue &value) override;
-
- Status DoWriteRegisterValue(uint32_t offset, const char *reg_name,
- const RegisterValue &value) override;
Status ReadGPR() override;
@@ -125,8 +122,17 @@
uint32_t fpcr;
};
- uint64_t m_gpr_arm64[k_num_gpr_registers_arm64]; // 64-bit general purpose
- // registers.
+ struct GPR {
+ uint64_t x[31];
+ uint64_t sp;
+ uint64_t pc;
+ uint64_t pstate;
+ };
+
+ bool m_gpr_is_valid;
+ bool m_fpu_is_valid;
+
+ GPR m_gpr_arm64; // 64-bit general purpose registers.
RegInfo m_reg_info;
FPU m_fpr; // floating-point registers including extended register sets.
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
@@ -152,6 +152,9 @@
m_max_hwp_supported = 16;
m_max_hbp_supported = 16;
m_refresh_hwdebug_info = true;
+
+ m_gpr_is_valid = false;
+ m_fpu_is_valid = false;
}
uint32_t NativeRegisterContextLinux_arm64::GetRegisterSetCount() const {
@@ -185,41 +188,39 @@
const uint32_t reg = reg_info->kinds[lldb::eRegisterKindLLDB];
- if (IsFPR(reg)) {
- error = ReadFPR();
- if (error.Fail())
- return error;
- } else {
- uint32_t full_reg = reg;
- bool is_subreg = reg_info->invalidate_regs &&
- (reg_info->invalidate_regs[0] != LLDB_INVALID_REGNUM);
+ if (reg == LLDB_INVALID_REGNUM)
+ return Status("no lldb regnum for %s", reg_info && reg_info->name
+ ? reg_info->name
+ : "<unknown register>");
+
+ uint8_t *src;
+ uint32_t offset;
- if (is_subreg) {
- // Read the full aligned 64-bit register.
- full_reg = reg_info->invalidate_regs[0];
+ if (IsGPR(reg)) {
+ if (!m_gpr_is_valid) {
+ error = ReadGPR();
+ if (error.Fail())
+ return error;
}
- error = ReadRegisterRaw(full_reg, reg_value);
+ offset = reg_info->byte_offset;
+ assert(offset < GetGPRSize());
+ src = (uint8_t *)GetGPRBuffer() + offset;
- if (error.Success()) {
- // If our read was not aligned (for ah,bh,ch,dh), shift our returned
- // value one byte to the right.
- if (is_subreg && (reg_info->byte_offset & 0x1))
- reg_value.SetUInt64(reg_value.GetAsUInt64() >> 8);
+ } else if (IsFPR(reg)) {
+ if (!m_fpu_is_valid) {
- // If our return byte size was greater than the return value reg size,
- // then use the type specified by reg_info rather than the uint64_t
- // default
- if (reg_value.GetByteSize() > reg_info->byte_size)
- reg_value.SetType(reg_info);
+ error = ReadFPR();
+ if (error.Fail())
+ return error;
}
- return error;
- }
+ offset = CalculateFprOffset(reg_info);
+ assert(offset < GetFPRSize());
+ src = (uint8_t *)GetFPRBuffer() + offset;
+ } else
+ return Status("failed - register wasn't recognized to be a GPR or an FPR, "
+ "write strategy unknown");
- // Get pointer to m_fpr variable and set the data from it.
- uint32_t fpr_offset = CalculateFprOffset(reg_info);
- assert(fpr_offset < sizeof m_fpr);
- uint8_t *src = (uint8_t *)&m_fpr + fpr_offset;
reg_value.SetFromMemoryData(reg_info, src, reg_info->byte_size,
eByteOrderLittle, error);
@@ -228,48 +229,51 @@
Status NativeRegisterContextLinux_arm64::WriteRegister(
const RegisterInfo *reg_info, const RegisterValue ®_value) {
+ Status error;
+
if (!reg_info)
return Status("reg_info NULL");
- const uint32_t reg_index = reg_info->kinds[lldb::eRegisterKindLLDB];
- if (reg_index == LLDB_INVALID_REGNUM)
+ const uint32_t reg = reg_info->kinds[lldb::eRegisterKindLLDB];
+
+ if (reg == LLDB_INVALID_REGNUM)
return Status("no lldb regnum for %s", reg_info && reg_info->name
? reg_info->name
: "<unknown register>");
- if (IsGPR(reg_index))
- return WriteRegisterRaw(reg_index, reg_value);
-
- if (IsFPR(reg_index)) {
- // Get pointer to m_fpr variable and set the data to it.
- uint32_t fpr_offset = CalculateFprOffset(reg_info);
- assert(fpr_offset < sizeof m_fpr);
- uint8_t *dst = (uint8_t *)&m_fpr + fpr_offset;
- switch (reg_info->byte_size) {
- case 2:
- *(uint16_t *)dst = reg_value.GetAsUInt16();
- break;
- case 4:
- *(uint32_t *)dst = reg_value.GetAsUInt32();
- break;
- case 8:
- *(uint64_t *)dst = reg_value.GetAsUInt64();
- break;
- default:
- assert(false && "Unhandled data size.");
- return Status("unhandled register data size %" PRIu32,
- reg_info->byte_size);
+ uint8_t *dst;
+ uint32_t offset;
+
+ if (IsGPR(reg)) {
+ if (!m_gpr_is_valid) {
+ error = ReadGPR();
+ if (error.Fail())
+ return error;
}
- Status error = WriteFPR();
- if (error.Fail())
- return error;
+ offset = reg_info->byte_offset;
+ assert(offset < GetGPRSize());
+ dst = (uint8_t *)GetGPRBuffer() + offset;
- return Status();
+ ::memcpy(dst, reg_value.GetBytes(), reg_info->byte_size);
+
+ return WriteGPR();
+ } else if (IsFPR(reg)) {
+ if (!m_fpu_is_valid) {
+ error = ReadFPR();
+ if (error.Fail())
+ return error;
+ }
+ offset = CalculateFprOffset(reg_info);
+ assert(offset < GetFPRSize());
+ dst = (uint8_t *)GetFPRBuffer() + offset;
+
+ ::memcpy(dst, reg_value.GetBytes(), reg_info->byte_size);
+
+ return WriteFPR();
}
- return Status("failed - register wasn't recognized to be a GPR or an FPR, "
- "write strategy unknown");
+ return error;
}
Status NativeRegisterContextLinux_arm64::ReadAllRegisterValues(
@@ -277,18 +281,21 @@
Status error;
data_sp.reset(new DataBufferHeap(REG_CONTEXT_SIZE, 0));
- error = ReadGPR();
- if (error.Fail())
- return error;
-
- error = ReadFPR();
- if (error.Fail())
- return error;
+ if (!m_gpr_is_valid) {
+ error = ReadGPR();
+ if (error.Fail())
+ return error;
+ }
+ if (!m_fpu_is_valid) {
+ error = ReadFPR();
+ if (error.Fail())
+ return error;
+ }
uint8_t *dst = data_sp->GetBytes();
- ::memcpy(dst, &m_gpr_arm64, GetGPRSize());
+ ::memcpy(dst, GetGPRBuffer(), GetGPRSize());
dst += GetGPRSize();
- ::memcpy(dst, &m_fpr, sizeof(m_fpr));
+ ::memcpy(dst, GetFPRBuffer(), GetFPRSize());
return error;
}
@@ -320,14 +327,14 @@
__FUNCTION__);
return error;
}
- ::memcpy(&m_gpr_arm64, src, GetRegisterInfoInterface().GetGPRSize());
+ ::memcpy(GetGPRBuffer(), src, GetRegisterInfoInterface().GetGPRSize());
error = WriteGPR();
if (error.Fail())
return error;
src += GetRegisterInfoInterface().GetGPRSize();
- ::memcpy(&m_fpr, src, sizeof(m_fpr));
+ ::memcpy(GetFPRBuffer(), src, GetFPRSize());
error = WriteFPR();
if (error.Fail())
@@ -832,117 +839,65 @@
&hwbType, &ioVec, ioVec.iov_len);
}
-Status NativeRegisterContextLinux_arm64::DoReadRegisterValue(
- uint32_t offset, const char *reg_name, uint32_t size,
- RegisterValue &value) {
- Status error;
- if (offset > sizeof(struct user_pt_regs)) {
- offset -= sizeof(struct user_pt_regs);
- if (offset > sizeof(struct user_fpsimd_state)) {
- error.SetErrorString("invalid offset value");
- return error;
- }
- elf_fpregset_t regs;
- int regset = NT_FPREGSET;
- struct iovec ioVec;
-
- ioVec.iov_base = ®s;
- ioVec.iov_len = sizeof regs;
- error = NativeProcessLinux::PtraceWrapper(
- PTRACE_GETREGSET, m_thread.GetID(), ®set, &ioVec, sizeof regs);
- if (error.Success()) {
- value.SetBytes((void *)(((unsigned char *)(®s)) + offset), 16,
- m_thread.GetProcess().GetByteOrder());
- }
- } else {
- elf_gregset_t regs;
- int regset = NT_PRSTATUS;
- struct iovec ioVec;
-
- ioVec.iov_base = ®s;
- ioVec.iov_len = sizeof regs;
- error = NativeProcessLinux::PtraceWrapper(
- PTRACE_GETREGSET, m_thread.GetID(), ®set, &ioVec, sizeof regs);
- if (error.Success()) {
- value.SetBytes((void *)(((unsigned char *)(regs)) + offset), 8,
- m_thread.GetProcess().GetByteOrder());
- }
- }
- return error;
-}
-
-Status NativeRegisterContextLinux_arm64::DoWriteRegisterValue(
- uint32_t offset, const char *reg_name, const RegisterValue &value) {
+Status NativeRegisterContextLinux_arm64::ReadGPR() {
Status error;
- ::pid_t tid = m_thread.GetID();
- if (offset > sizeof(struct user_pt_regs)) {
- offset -= sizeof(struct user_pt_regs);
- if (offset > sizeof(struct user_fpsimd_state)) {
- error.SetErrorString("invalid offset value");
- return error;
- }
- elf_fpregset_t regs;
- int regset = NT_FPREGSET;
- struct iovec ioVec;
-
- ioVec.iov_base = ®s;
- ioVec.iov_len = sizeof regs;
- error = NativeProcessLinux::PtraceWrapper(PTRACE_GETREGSET, tid, ®set,
- &ioVec, sizeof regs);
-
- if (error.Success()) {
- ::memcpy((void *)(((unsigned char *)(®s)) + offset), value.GetBytes(),
- 16);
- error = NativeProcessLinux::PtraceWrapper(PTRACE_SETREGSET, tid, ®set,
- &ioVec, sizeof regs);
- }
- } else {
- elf_gregset_t regs;
- int regset = NT_PRSTATUS;
- struct iovec ioVec;
-
- ioVec.iov_base = ®s;
- ioVec.iov_len = sizeof regs;
- error = NativeProcessLinux::PtraceWrapper(PTRACE_GETREGSET, tid, ®set,
- &ioVec, sizeof regs);
- if (error.Success()) {
- ::memcpy((void *)(((unsigned char *)(®s)) + offset), value.GetBytes(),
- 8);
- error = NativeProcessLinux::PtraceWrapper(PTRACE_SETREGSET, tid, ®set,
- &ioVec, sizeof regs);
- }
- }
- return error;
-}
-Status NativeRegisterContextLinux_arm64::ReadGPR() {
struct iovec ioVec;
+
ioVec.iov_base = GetGPRBuffer();
ioVec.iov_len = GetGPRSize();
- return ReadRegisterSet(&ioVec, GetGPRSize(), NT_PRSTATUS);
+
+ error = ReadRegisterSet(&ioVec, GetGPRSize(), NT_PRSTATUS);
+
+ if (error.Success())
+ m_gpr_is_valid = true;
+
+ return error;
}
Status NativeRegisterContextLinux_arm64::WriteGPR() {
struct iovec ioVec;
+
+ m_gpr_is_valid = false;
+
ioVec.iov_base = GetGPRBuffer();
ioVec.iov_len = GetGPRSize();
+
return WriteRegisterSet(&ioVec, GetGPRSize(), NT_PRSTATUS);
}
Status NativeRegisterContextLinux_arm64::ReadFPR() {
+ Status error;
+
struct iovec ioVec;
+
ioVec.iov_base = GetFPRBuffer();
ioVec.iov_len = GetFPRSize();
- return ReadRegisterSet(&ioVec, GetFPRSize(), NT_FPREGSET);
+
+ error = ReadRegisterSet(&ioVec, GetFPRSize(), NT_FPREGSET);
+
+ if (error.Success())
+ m_fpu_is_valid = true;
+
+ return error;
}
Status NativeRegisterContextLinux_arm64::WriteFPR() {
struct iovec ioVec;
+
+ m_fpu_is_valid = false;
+
ioVec.iov_base = GetFPRBuffer();
ioVec.iov_len = GetFPRSize();
+
return WriteRegisterSet(&ioVec, GetFPRSize(), NT_FPREGSET);
}
+void NativeRegisterContextLinux_arm64::InvalidateAllRegisters() {
+ m_gpr_is_valid = false;
+ m_fpu_is_valid = false;
+}
+
uint32_t NativeRegisterContextLinux_arm64::CalculateFprOffset(
const RegisterInfo *reg_info) const {
return reg_info->byte_offset -
Index: lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux.h
===================================================================
--- lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux.h
+++ lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux.h
@@ -28,6 +28,9 @@
CreateHostNativeRegisterContextLinux(const ArchSpec &target_arch,
NativeThreadProtocol &native_thread);
+ // Invalidates cached values in register context data structures
+ virtual void InvalidateAllRegisters(){}
+
protected:
lldb::ByteOrder GetByteOrder() const;
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