1 //===-- RegisterContextPOSIX_mips64.cpp -------------------------*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include <cstring>
11 #include <errno.h>
12 #include <stdint.h>
13 
14 #include "lldb/Core/RegisterValue.h"
15 #include "lldb/Core/Scalar.h"
16 #include "lldb/Target/Target.h"
17 #include "lldb/Target/Thread.h"
18 #include "lldb/Utility/DataBufferHeap.h"
19 #include "lldb/Utility/DataExtractor.h"
20 #include "lldb/Utility/Endian.h"
21 #include "llvm/Support/Compiler.h"
22 
23 #include "Plugins/Process/elf-core/ProcessElfCore.h"
24 #include "RegisterContextPOSIX_mips64.h"
25 #include "RegisterContextFreeBSD_mips64.h"
26 #include "RegisterContextLinux_mips64.h"
27 #include "RegisterContextLinux_mips.h"
28 
29 using namespace lldb_private;
30 using namespace lldb;
31 
32 bool RegisterContextPOSIX_mips64::IsGPR(unsigned reg) {
33   return reg < m_registers_count[gpr_registers_count]; // GPR's come first.
34 }
35 
36 bool RegisterContextPOSIX_mips64::IsFPR(unsigned reg) {
37   int set = GetRegisterSetCount();
38   if (set > 1)
39     return reg < (m_registers_count[fpr_registers_count]
40                   + m_registers_count[gpr_registers_count]);
41   return false;
42 }
43 
44 RegisterContextPOSIX_mips64::RegisterContextPOSIX_mips64(
45     Thread &thread, uint32_t concrete_frame_idx,
46     RegisterInfoInterface *register_info)
47     : RegisterContext(thread, concrete_frame_idx) {
48   m_register_info_ap.reset(register_info);
49   m_num_registers = GetRegisterCount();
50   int set = GetRegisterSetCount();
51 
52   const RegisterSet *reg_set_ptr;
53   for(int i = 0; i < set; ++i) {
54       reg_set_ptr = GetRegisterSet(i);
55       m_registers_count[i] = reg_set_ptr->num_registers;
56   }
57 
58   assert(m_num_registers == m_registers_count[gpr_registers_count] +
59                             m_registers_count[fpr_registers_count] +
60                             m_registers_count[msa_registers_count]);
61 
62   // elf-core yet to support ReadFPR()
63   ProcessSP base = CalculateProcess();
64   if (base.get()->GetPluginName() == ProcessElfCore::GetPluginNameStatic())
65     return;
66 }
67 
68 RegisterContextPOSIX_mips64::~RegisterContextPOSIX_mips64() {}
69 
70 void RegisterContextPOSIX_mips64::Invalidate() {}
71 
72 void RegisterContextPOSIX_mips64::InvalidateAllRegisters() {}
73 
74 unsigned RegisterContextPOSIX_mips64::GetRegisterOffset(unsigned reg) {
75   assert(reg < m_num_registers && "Invalid register number.");
76   return GetRegisterInfo()[reg].byte_offset;
77 }
78 
79 unsigned RegisterContextPOSIX_mips64::GetRegisterSize(unsigned reg) {
80   assert(reg < m_num_registers && "Invalid register number.");
81   return GetRegisterInfo()[reg].byte_size;
82 }
83 
84 size_t RegisterContextPOSIX_mips64::GetRegisterCount() {
85   return m_register_info_ap->GetRegisterCount();
86 }
87 
88 size_t RegisterContextPOSIX_mips64::GetGPRSize() {
89   return m_register_info_ap->GetGPRSize();
90 }
91 
92 const RegisterInfo *RegisterContextPOSIX_mips64::GetRegisterInfo() {
93   // Commonly, this method is overridden and g_register_infos is copied and
94   // specialized.
95   // So, use GetRegisterInfo() rather than g_register_infos in this scope.
96   return m_register_info_ap->GetRegisterInfo();
97 }
98 
99 const RegisterInfo *
100 RegisterContextPOSIX_mips64::GetRegisterInfoAtIndex(size_t reg) {
101   if (reg < m_num_registers)
102     return &GetRegisterInfo()[reg];
103   else
104     return NULL;
105 }
106 
107 size_t RegisterContextPOSIX_mips64::GetRegisterSetCount() {
108   ArchSpec target_arch = m_register_info_ap->GetTargetArchitecture();
109   switch (target_arch.GetTriple().getOS()) {
110   case llvm::Triple::Linux: {
111     if ((target_arch.GetMachine() == llvm::Triple::mipsel) ||
112          (target_arch.GetMachine() == llvm::Triple::mips)) {
113       const auto *context = static_cast<const RegisterContextLinux_mips *>
114                                         (m_register_info_ap.get());
115       return context->GetRegisterSetCount();
116     }
117     const auto *context = static_cast<const RegisterContextLinux_mips64 *>
118                                       (m_register_info_ap.get());
119     return context->GetRegisterSetCount();
120   }
121   default: {
122     const auto *context = static_cast<const RegisterContextFreeBSD_mips64 *>
123                                       (m_register_info_ap.get());
124     return context->GetRegisterSetCount();
125   }
126 
127   }
128 }
129 
130 const RegisterSet *RegisterContextPOSIX_mips64::GetRegisterSet(size_t set) {
131   ArchSpec target_arch = m_register_info_ap->GetTargetArchitecture();
132   switch (target_arch.GetTriple().getOS()) {
133   case llvm::Triple::Linux: {
134     if ((target_arch.GetMachine() == llvm::Triple::mipsel) ||
135          (target_arch.GetMachine() == llvm::Triple::mips)) {
136       const auto *context = static_cast<const RegisterContextLinux_mips *>
137                                         (m_register_info_ap.get());
138       return context->GetRegisterSet(set);
139     }
140     const auto *context = static_cast<const RegisterContextLinux_mips64 *>
141                                       (m_register_info_ap.get());
142     return context->GetRegisterSet(set);
143   }
144   default: {
145     const auto *context = static_cast<const RegisterContextFreeBSD_mips64 *>
146                                        (m_register_info_ap.get());
147     return context->GetRegisterSet(set);
148   }
149   }
150 }
151 
152 const char *RegisterContextPOSIX_mips64::GetRegisterName(unsigned reg) {
153   assert(reg < m_num_registers && "Invalid register offset.");
154   return GetRegisterInfo()[reg].name;
155 }
156 
157 lldb::ByteOrder RegisterContextPOSIX_mips64::GetByteOrder() {
158   // Get the target process whose privileged thread was used for the register
159   // read.
160   lldb::ByteOrder byte_order = eByteOrderInvalid;
161   Process *process = CalculateProcess().get();
162 
163   if (process)
164     byte_order = process->GetByteOrder();
165   return byte_order;
166 }
167 
168 bool RegisterContextPOSIX_mips64::IsRegisterSetAvailable(size_t set_index) {
169   size_t num_sets = GetRegisterSetCount();
170 
171   return (set_index < num_sets);
172 }
173 
174 // Used when parsing DWARF and EH frame information and any other
175 // object file sections that contain register numbers in them.
176 uint32_t RegisterContextPOSIX_mips64::ConvertRegisterKindToRegisterNumber(
177     lldb::RegisterKind kind, uint32_t num) {
178   const uint32_t num_regs = m_num_registers;
179 
180   assert(kind < kNumRegisterKinds);
181   for (uint32_t reg_idx = 0; reg_idx < num_regs; ++reg_idx) {
182     const RegisterInfo *reg_info = GetRegisterInfoAtIndex(reg_idx);
183 
184     if (reg_info->kinds[kind] == num)
185       return reg_idx;
186   }
187 
188   return LLDB_INVALID_REGNUM;
189 }
190