forked from OSchip/llvm-project
137 lines
4.1 KiB
C++
137 lines
4.1 KiB
C++
//===-- ABISysV_x86_64.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_ABISysV_x86_64_h_
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#define liblldb_ABISysV_x86_64_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/lldb-private.h"
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#include "lldb/Target/ABI.h"
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class ABISysV_x86_64 :
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public lldb_private::ABI
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{
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public:
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~ABISysV_x86_64() override = default;
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size_t
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GetRedZoneSize() const override;
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bool
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PrepareTrivialCall(lldb_private::Thread &thread,
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lldb::addr_t sp,
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lldb::addr_t functionAddress,
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lldb::addr_t returnAddress,
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llvm::ArrayRef<lldb::addr_t> args) const override;
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bool
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GetArgumentValues(lldb_private::Thread &thread,
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lldb_private::ValueList &values) const override;
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lldb_private::Error
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SetReturnValueObject(lldb::StackFrameSP &frame_sp, lldb::ValueObjectSP &new_value) override;
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lldb::ValueObjectSP
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GetReturnValueObjectImpl(lldb_private::Thread &thread,
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lldb_private::CompilerType &type) const override;
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bool
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CreateFunctionEntryUnwindPlan(lldb_private::UnwindPlan &unwind_plan) override;
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bool
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CreateDefaultUnwindPlan(lldb_private::UnwindPlan &unwind_plan) override;
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bool
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RegisterIsVolatile(const lldb_private::RegisterInfo *reg_info) override;
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// The SysV x86_64 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 (8-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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bool
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CallFrameAddressIsValid(lldb::addr_t cfa) override
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{
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// Make sure the stack call frame addresses are 8 byte aligned
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if (cfa & (8ull - 1ull))
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return false; // Not 8 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
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CodeAddressIsValid(lldb::addr_t pc) override
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{
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// We have a 64 bit address space, so anything is valid as opcodes
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// aren't fixed width...
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return true;
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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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bool
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GetPointerReturnRegister (const char *&name) override;
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//------------------------------------------------------------------
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// Static Functions
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//------------------------------------------------------------------
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static void
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Initialize();
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static void
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Terminate();
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static lldb::ABISP
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CreateInstance (const lldb_private::ArchSpec &arch);
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static lldb_private::ConstString
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GetPluginNameStatic();
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//------------------------------------------------------------------
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// PluginInterface protocol
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//------------------------------------------------------------------
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lldb_private::ConstString
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GetPluginName() override;
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uint32_t
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GetPluginVersion() override;
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protected:
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void
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CreateRegisterMapIfNeeded ();
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lldb::ValueObjectSP
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GetReturnValueObjectSimple(lldb_private::Thread &thread,
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lldb_private::CompilerType &ast_type) const;
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bool
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RegisterIsCalleeSaved (const lldb_private::RegisterInfo *reg_info);
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private:
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ABISysV_x86_64() :
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lldb_private::ABI()
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{
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// Call CreateInstance instead.
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}
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};
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#endif // liblldb_ABISysV_x86_64_h_
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