diff options
Diffstat (limited to 'source/Plugins/ABI/SysV-i386/ABISysV_i386.h')
| -rw-r--r-- | source/Plugins/ABI/SysV-i386/ABISysV_i386.h | 204 |
1 files changed, 90 insertions, 114 deletions
diff --git a/source/Plugins/ABI/SysV-i386/ABISysV_i386.h b/source/Plugins/ABI/SysV-i386/ABISysV_i386.h index 2d0f097c328e..8d1d76b5dfd9 100644 --- a/source/Plugins/ABI/SysV-i386/ABISysV_i386.h +++ b/source/Plugins/ABI/SysV-i386/ABISysV_i386.h @@ -14,128 +14,104 @@ // C++ Includes // Other libraries and framework includes // Project includes -#include "lldb/lldb-private.h" #include "lldb/Target/ABI.h" +#include "lldb/lldb-private.h" -class ABISysV_i386 : - public lldb_private::ABI -{ +class ABISysV_i386 : public lldb_private::ABI { public: - ~ABISysV_i386() override = default; - - size_t - GetRedZoneSize () const override - { - return 0; // There is no red zone for i386 Architecture - } - - bool - PrepareTrivialCall (lldb_private::Thread &thread, - lldb::addr_t sp, - lldb::addr_t functionAddress, - lldb::addr_t returnAddress, - llvm::ArrayRef<lldb::addr_t> args) const override; - - bool - GetArgumentValues (lldb_private::Thread &thread, - lldb_private::ValueList &values) const override; - - lldb_private::Error - SetReturnValueObject(lldb::StackFrameSP &frame_sp, lldb::ValueObjectSP &new_value) override; - - lldb::ValueObjectSP - GetReturnValueObjectImpl (lldb_private::Thread &thread, - lldb_private::CompilerType &type) const override; - - bool - CreateFunctionEntryUnwindPlan (lldb_private::UnwindPlan &unwind_plan) override; - - bool - CreateDefaultUnwindPlan (lldb_private::UnwindPlan &unwind_plan) override; - - bool - RegisterIsVolatile (const lldb_private::RegisterInfo *reg_info) override - { - return !RegisterIsCalleeSaved (reg_info); - } - - // The SysV i386 ABI requires that stack frames be 16 byte aligned. - // When there is a trap handler on the stack, e.g. _sigtramp in userland - // code, we've seen that the stack pointer is often not aligned properly - // before the handler is invoked. This means that lldb will stop the unwind - // early -- before the function which caused the trap. - // - // To work around this, we relax that alignment to be just word-size (4-bytes). - // Whitelisting the trap handlers for user space would be easy (_sigtramp) but - // in other environments there can be a large number of different functions - // involved in async traps. - - // ToDo: When __m256 arguments are passed then stack frames should be - // 32 byte aligned. Decide what to do for 32 byte alignment checking - bool - CallFrameAddressIsValid (lldb::addr_t cfa) override - { - // Make sure the stack call frame addresses are 4 byte aligned - if (cfa & (4ull - 1ull)) - return false; // Not 4 byte aligned - if (cfa == 0) - return false; // Zero is not a valid stack address - return true; - } - - bool - CodeAddressIsValid (lldb::addr_t pc) override - { - // Check whether the address is a valid 32 bit address - return (pc <= UINT32_MAX); - } - - const lldb_private::RegisterInfo * - GetRegisterInfoArray (uint32_t &count) override; - - //------------------------------------------------------------------ - // Static Functions - //------------------------------------------------------------------ - - static void - Initialize(); - - static void - Terminate(); - - static lldb::ABISP - CreateInstance (const lldb_private::ArchSpec &arch); - - //------------------------------------------------------------------ - // PluginInterface protocol - //------------------------------------------------------------------ - - static lldb_private::ConstString - GetPluginNameStatic(); - - lldb_private::ConstString - GetPluginName() override; - - uint32_t - GetPluginVersion() override - { - return 1; - } + ~ABISysV_i386() override = default; + + size_t GetRedZoneSize() const override { + return 0; // There is no red zone for i386 Architecture + } + + bool PrepareTrivialCall(lldb_private::Thread &thread, lldb::addr_t sp, + lldb::addr_t functionAddress, + lldb::addr_t returnAddress, + llvm::ArrayRef<lldb::addr_t> args) const override; + + bool GetArgumentValues(lldb_private::Thread &thread, + lldb_private::ValueList &values) const override; + + lldb_private::Error + SetReturnValueObject(lldb::StackFrameSP &frame_sp, + lldb::ValueObjectSP &new_value) override; + + lldb::ValueObjectSP + GetReturnValueObjectImpl(lldb_private::Thread &thread, + lldb_private::CompilerType &type) const override; + + bool + CreateFunctionEntryUnwindPlan(lldb_private::UnwindPlan &unwind_plan) override; + + bool CreateDefaultUnwindPlan(lldb_private::UnwindPlan &unwind_plan) override; + + bool RegisterIsVolatile(const lldb_private::RegisterInfo *reg_info) override { + return !RegisterIsCalleeSaved(reg_info); + } + + // The SysV i386 ABI requires that stack frames be 16 byte aligned. + // When there is a trap handler on the stack, e.g. _sigtramp in userland + // code, we've seen that the stack pointer is often not aligned properly + // before the handler is invoked. This means that lldb will stop the unwind + // early -- before the function which caused the trap. + // + // To work around this, we relax that alignment to be just word-size + // (4-bytes). + // Whitelisting the trap handlers for user space would be easy (_sigtramp) but + // in other environments there can be a large number of different functions + // involved in async traps. + + // ToDo: When __m256 arguments are passed then stack frames should be + // 32 byte aligned. Decide what to do for 32 byte alignment checking + bool CallFrameAddressIsValid(lldb::addr_t cfa) override { + // Make sure the stack call frame addresses are 4 byte aligned + if (cfa & (4ull - 1ull)) + return false; // Not 4 byte aligned + if (cfa == 0) + return false; // Zero is not a valid stack address + return true; + } + + bool CodeAddressIsValid(lldb::addr_t pc) override { + // Check whether the address is a valid 32 bit address + return (pc <= UINT32_MAX); + } + + const lldb_private::RegisterInfo * + GetRegisterInfoArray(uint32_t &count) override; + + //------------------------------------------------------------------ + // Static Functions + //------------------------------------------------------------------ + + static void Initialize(); + + static void Terminate(); + + static lldb::ABISP CreateInstance(const lldb_private::ArchSpec &arch); + + //------------------------------------------------------------------ + // PluginInterface protocol + //------------------------------------------------------------------ + + static lldb_private::ConstString GetPluginNameStatic(); + + lldb_private::ConstString GetPluginName() override; + + uint32_t GetPluginVersion() override { return 1; } protected: - lldb::ValueObjectSP - GetReturnValueObjectSimple(lldb_private::Thread &thread, - lldb_private::CompilerType &ast_type) const; + lldb::ValueObjectSP + GetReturnValueObjectSimple(lldb_private::Thread &thread, + lldb_private::CompilerType &ast_type) const; - bool - RegisterIsCalleeSaved(const lldb_private::RegisterInfo *reg_info); + bool RegisterIsCalleeSaved(const lldb_private::RegisterInfo *reg_info); private: - ABISysV_i386() : - lldb_private::ABI() - { - // Call CreateInstance instead. - } + ABISysV_i386() : lldb_private::ABI() { + // Call CreateInstance instead. + } }; #endif // liblldb_ABISysV_i386_h_ |