1 //===-- ABISysV_mips64.h ----------------------------------------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #ifndef LLDB_SOURCE_PLUGINS_ABI_MIPS_ABISYSV_MIPS64_H 10 #define LLDB_SOURCE_PLUGINS_ABI_MIPS_ABISYSV_MIPS64_H 11 12 #include "lldb/Target/ABI.h" 13 #include "lldb/lldb-private.h" 14 15 class ABISysV_mips64 : public lldb_private::RegInfoBasedABI { 16 public: 17 ~ABISysV_mips64() override = default; 18 19 size_t GetRedZoneSize() const override; 20 21 bool PrepareTrivialCall(lldb_private::Thread &thread, lldb::addr_t sp, 22 lldb::addr_t functionAddress, 23 lldb::addr_t returnAddress, 24 llvm::ArrayRef<lldb::addr_t> args) const override; 25 26 bool GetArgumentValues(lldb_private::Thread &thread, 27 lldb_private::ValueList &values) const override; 28 29 lldb_private::Status 30 SetReturnValueObject(lldb::StackFrameSP &frame_sp, 31 lldb::ValueObjectSP &new_value) override; 32 33 lldb::ValueObjectSP 34 GetReturnValueObjectImpl(lldb_private::Thread &thread, 35 lldb_private::CompilerType &type) const override; 36 37 bool 38 CreateFunctionEntryUnwindPlan(lldb_private::UnwindPlan &unwind_plan) override; 39 40 bool CreateDefaultUnwindPlan(lldb_private::UnwindPlan &unwind_plan) override; 41 42 bool RegisterIsVolatile(const lldb_private::RegisterInfo *reg_info) override; 43 44 bool IsSoftFloat(uint32_t fp_flag) const; 45 46 // The SysV mips ABI requires that stack frames be 16 byte aligned. 47 // When there is a trap handler on the stack, e.g. _sigtramp in userland 48 // code, we've seen that the stack pointer is often not aligned properly 49 // before the handler is invoked. This means that lldb will stop the unwind 50 // early -- before the function which caused the trap. 51 // 52 // To work around this, we relax that alignment to be just word-size 53 // (8-bytes). 54 // Allowing the trap handlers for user space would be easy (_sigtramp) but 55 // in other environments there can be a large number of different functions 56 // involved in async traps. CallFrameAddressIsValid(lldb::addr_t cfa)57 bool CallFrameAddressIsValid(lldb::addr_t cfa) override { 58 // Make sure the stack call frame addresses are 8 byte aligned 59 if (cfa & (8ull - 1ull)) 60 return false; // Not 8 byte aligned 61 if (cfa == 0) 62 return false; // Zero is not a valid stack address 63 return true; 64 } 65 CodeAddressIsValid(lldb::addr_t pc)66 bool CodeAddressIsValid(lldb::addr_t pc) override { 67 if (pc & (4ull - 1ull)) 68 return false; // Not 4 byte aligned 69 70 // Anything else if fair game.. 71 return true; 72 } 73 74 const lldb_private::RegisterInfo * 75 GetRegisterInfoArray(uint32_t &count) override; 76 77 // Static Functions 78 79 static void Initialize(); 80 81 static void Terminate(); 82 83 static lldb::ABISP CreateInstance(lldb::ProcessSP process_sp, const lldb_private::ArchSpec &arch); 84 85 static lldb_private::ConstString GetPluginNameStatic(); 86 87 // PluginInterface protocol 88 89 lldb_private::ConstString GetPluginName() override; 90 91 uint32_t GetPluginVersion() override; 92 93 protected: 94 void CreateRegisterMapIfNeeded(); 95 96 lldb::ValueObjectSP 97 GetReturnValueObjectSimple(lldb_private::Thread &thread, 98 lldb_private::CompilerType &ast_type) const; 99 100 bool RegisterIsCalleeSaved(const lldb_private::RegisterInfo *reg_info); 101 102 private: 103 using lldb_private::RegInfoBasedABI::RegInfoBasedABI; // Call CreateInstance instead. 104 }; 105 106 #endif // LLDB_SOURCE_PLUGINS_ABI_MIPS_ABISYSV_MIPS64_H 107