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110 lines
3.8 KiB
C++
110 lines
3.8 KiB
C++
//===-- ABIMacOSX_i386.h ----------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef liblldb_ABIMacOSX_i386_h_
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#define liblldb_ABIMacOSX_i386_h_
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// C Includes
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// C++ Includes
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// Other libraries and framework includes
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// Project includes
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#include "lldb/Core/Value.h"
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#include "lldb/Target/ABI.h"
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#include "lldb/lldb-private.h"
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class ABIMacOSX_i386 : public lldb_private::ABI {
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public:
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~ABIMacOSX_i386() override = default;
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size_t GetRedZoneSize() const override;
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bool PrepareTrivialCall(lldb_private::Thread &thread, lldb::addr_t sp,
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lldb::addr_t func_addr, lldb::addr_t return_addr,
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llvm::ArrayRef<lldb::addr_t> args) const override;
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bool GetArgumentValues(lldb_private::Thread &thread,
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lldb_private::ValueList &values) const override;
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lldb_private::Status
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SetReturnValueObject(lldb::StackFrameSP &frame_sp,
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lldb::ValueObjectSP &new_value) override;
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bool
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CreateFunctionEntryUnwindPlan(lldb_private::UnwindPlan &unwind_plan) override;
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bool CreateDefaultUnwindPlan(lldb_private::UnwindPlan &unwind_plan) override;
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bool RegisterIsVolatile(const lldb_private::RegisterInfo *reg_info) override;
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// The Darwin i386 ABI requires that stack frames be 16 byte aligned.
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// When there is a trap handler on the stack, e.g. _sigtramp in userland
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// code, we've seen that the stack pointer is often not aligned properly
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// before the handler is invoked. This means that lldb will stop the unwind
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// early -- before the function which caused the trap.
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//
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// To work around this, we relax that alignment to be just word-size
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// (4-bytes).
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// Whitelisting the trap handlers for user space would be easy (_sigtramp) but
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// in other environments there can be a large number of different functions
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// involved in async traps.
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//
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// If we were to enforce 16-byte alignment, we also need to relax to 4-byte
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// alignment for non-darwin i386 targets.
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bool CallFrameAddressIsValid(lldb::addr_t cfa) override {
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// Make sure the stack call frame addresses are are 4 byte aligned
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if (cfa & (4ull - 1ull))
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return false; // Not 4 byte aligned
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if (cfa == 0)
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return false; // Zero is not a valid stack address
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return true;
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}
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bool CodeAddressIsValid(lldb::addr_t pc) override {
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// Just make sure the address is a valid 32 bit address.
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return pc <= UINT32_MAX;
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}
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const lldb_private::RegisterInfo *
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GetRegisterInfoArray(uint32_t &count) override;
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//------------------------------------------------------------------
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// Static Functions
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//------------------------------------------------------------------
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static void Initialize();
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static void Terminate();
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static lldb::ABISP CreateInstance(lldb::ProcessSP process_sp, const lldb_private::ArchSpec &arch);
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//------------------------------------------------------------------
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// PluginInterface protocol
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//------------------------------------------------------------------
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static lldb_private::ConstString GetPluginNameStatic();
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lldb_private::ConstString GetPluginName() override;
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uint32_t GetPluginVersion() override;
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protected:
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lldb::ValueObjectSP
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GetReturnValueObjectImpl(lldb_private::Thread &thread,
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lldb_private::CompilerType &ast_type) const override;
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bool RegisterIsCalleeSaved(const lldb_private::RegisterInfo *reg_info);
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private:
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ABIMacOSX_i386(lldb::ProcessSP process_sp) : lldb_private::ABI(process_sp) {
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// Call CreateInstance instead.
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}
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};
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#endif // liblldb_ABIMacOSX_i386_h_
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