| //===------------------- ABISysV_i386.h -------------------------*- C++ -*-===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLDB_SOURCE_PLUGINS_ABI_X86_ABISYSV_I386_H |
| #define LLDB_SOURCE_PLUGINS_ABI_X86_ABISYSV_I386_H |
| |
| #include "Plugins/ABI/X86/ABIX86.h" |
| #include "lldb/lldb-private.h" |
| |
| class ABISysV_i386 : public ABIX86 { |
| 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::Status |
| 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). |
| // Allowing 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); |
| } |
| |
| // Static Functions |
| |
| static void Initialize(); |
| |
| static void Terminate(); |
| |
| static lldb::ABISP CreateInstance(lldb::ProcessSP process_sp, 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; |
| |
| bool RegisterIsCalleeSaved(const lldb_private::RegisterInfo *reg_info); |
| |
| private: |
| using ABIX86::ABIX86; // Call CreateInstance instead. |
| }; |
| |
| #endif // LLDB_SOURCE_PLUGINS_ABI_X86_ABISYSV_I386_H |