1 //===-- ABISysV_x86_64.h ----------------------------------------*- C++ -*-===//
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
7 //===----------------------------------------------------------------------===//
9 #ifndef liblldb_ABISysV_x86_64_h_
10 #define liblldb_ABISysV_x86_64_h_
12 #include "lldb/Target/ABI.h"
13 #include "lldb/lldb-private.h"
15 class ABISysV_x86_64 : public lldb_private::ABI {
17 ~ABISysV_x86_64() override = default;
19 size_t GetRedZoneSize() const override;
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;
26 bool GetArgumentValues(lldb_private::Thread &thread,
27 lldb_private::ValueList &values) const override;
30 SetReturnValueObject(lldb::StackFrameSP &frame_sp,
31 lldb::ValueObjectSP &new_value) override;
34 GetReturnValueObjectImpl(lldb_private::Thread &thread,
35 lldb_private::CompilerType &type) const override;
38 CreateFunctionEntryUnwindPlan(lldb_private::UnwindPlan &unwind_plan) override;
40 bool CreateDefaultUnwindPlan(lldb_private::UnwindPlan &unwind_plan) override;
42 bool RegisterIsVolatile(const lldb_private::RegisterInfo *reg_info) override;
44 // The SysV x86_64 ABI requires that stack frames be 16 byte aligned.
45 // When there is a trap handler on the stack, e.g. _sigtramp in userland
46 // code, we've seen that the stack pointer is often not aligned properly
47 // before the handler is invoked. This means that lldb will stop the unwind
48 // early -- before the function which caused the trap.
50 // To work around this, we relax that alignment to be just word-size
52 // Whitelisting the trap handlers for user space would be easy (_sigtramp) but
53 // in other environments there can be a large number of different functions
54 // involved in async traps.
55 bool CallFrameAddressIsValid(lldb::addr_t cfa) override {
56 // Make sure the stack call frame addresses are 8 byte aligned
57 if (cfa & (8ull - 1ull))
58 return false; // Not 8 byte aligned
60 return false; // Zero is not a valid stack address
64 bool CodeAddressIsValid(lldb::addr_t pc) override {
65 // We have a 64 bit address space, so anything is valid as opcodes
66 // aren't fixed width...
70 const lldb_private::RegisterInfo *
71 GetRegisterInfoArray(uint32_t &count) override;
73 bool GetPointerReturnRegister(const char *&name) override;
77 static void Initialize();
79 static void Terminate();
81 static lldb::ABISP CreateInstance(lldb::ProcessSP process_sp, const lldb_private::ArchSpec &arch);
83 static lldb_private::ConstString GetPluginNameStatic();
85 // PluginInterface protocol
87 lldb_private::ConstString GetPluginName() override;
89 uint32_t GetPluginVersion() override;
92 void CreateRegisterMapIfNeeded();
95 GetReturnValueObjectSimple(lldb_private::Thread &thread,
96 lldb_private::CompilerType &ast_type) const;
98 bool RegisterIsCalleeSaved(const lldb_private::RegisterInfo *reg_info);
101 ABISysV_x86_64(lldb::ProcessSP process_sp) : lldb_private::ABI(process_sp) {
102 // Call CreateInstance instead.
106 #endif // liblldb_ABISysV_x86_64_h_