1 //===-- RegisterContextPOSIX_arm.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/Target/Process.h"
15 #include "lldb/Target/Target.h"
16 #include "lldb/Target/Thread.h"
17 #include "lldb/Utility/DataBufferHeap.h"
18 #include "lldb/Utility/DataExtractor.h"
19 #include "lldb/Utility/Endian.h"
20 #include "lldb/Utility/RegisterValue.h"
21 #include "lldb/Utility/Scalar.h"
22 #include "llvm/Support/Compiler.h"
23
24 #include "RegisterContextPOSIX_arm.h"
25
26 using namespace lldb;
27 using namespace lldb_private;
28
29 // arm general purpose registers.
30 const uint32_t g_gpr_regnums_arm[] = {
31 gpr_r0_arm, gpr_r1_arm, gpr_r2_arm, gpr_r3_arm, gpr_r4_arm,
32 gpr_r5_arm, gpr_r6_arm, gpr_r7_arm, gpr_r8_arm, gpr_r9_arm,
33 gpr_r10_arm, gpr_r11_arm, gpr_r12_arm, gpr_sp_arm, gpr_lr_arm,
34 gpr_pc_arm, gpr_cpsr_arm,
35 LLDB_INVALID_REGNUM // register sets need to end with this flag
36
37 };
38 static_assert(((sizeof g_gpr_regnums_arm / sizeof g_gpr_regnums_arm[0]) - 1) ==
39 k_num_gpr_registers_arm,
40 "g_gpr_regnums_arm has wrong number of register infos");
41
42 // arm floating point registers.
43 static const uint32_t g_fpu_regnums_arm[] = {
44 fpu_s0_arm, fpu_s1_arm, fpu_s2_arm, fpu_s3_arm, fpu_s4_arm,
45 fpu_s5_arm, fpu_s6_arm, fpu_s7_arm, fpu_s8_arm, fpu_s9_arm,
46 fpu_s10_arm, fpu_s11_arm, fpu_s12_arm, fpu_s13_arm, fpu_s14_arm,
47 fpu_s15_arm, fpu_s16_arm, fpu_s17_arm, fpu_s18_arm, fpu_s19_arm,
48 fpu_s20_arm, fpu_s21_arm, fpu_s22_arm, fpu_s23_arm, fpu_s24_arm,
49 fpu_s25_arm, fpu_s26_arm, fpu_s27_arm, fpu_s28_arm, fpu_s29_arm,
50 fpu_s30_arm, fpu_s31_arm, fpu_fpscr_arm, fpu_d0_arm, fpu_d1_arm,
51 fpu_d2_arm, fpu_d3_arm, fpu_d4_arm, fpu_d5_arm, fpu_d6_arm,
52 fpu_d7_arm, fpu_d8_arm, fpu_d9_arm, fpu_d10_arm, fpu_d11_arm,
53 fpu_d12_arm, fpu_d13_arm, fpu_d14_arm, fpu_d15_arm, fpu_d16_arm,
54 fpu_d17_arm, fpu_d18_arm, fpu_d19_arm, fpu_d20_arm, fpu_d21_arm,
55 fpu_d22_arm, fpu_d23_arm, fpu_d24_arm, fpu_d25_arm, fpu_d26_arm,
56 fpu_d27_arm, fpu_d28_arm, fpu_d29_arm, fpu_d30_arm, fpu_d31_arm,
57 fpu_q0_arm, fpu_q1_arm, fpu_q2_arm, fpu_q3_arm, fpu_q4_arm,
58 fpu_q5_arm, fpu_q6_arm, fpu_q7_arm, fpu_q8_arm, fpu_q9_arm,
59 fpu_q10_arm, fpu_q11_arm, fpu_q12_arm, fpu_q13_arm, fpu_q14_arm,
60 fpu_q15_arm,
61 LLDB_INVALID_REGNUM // register sets need to end with this flag
62
63 };
64 static_assert(((sizeof g_fpu_regnums_arm / sizeof g_fpu_regnums_arm[0]) - 1) ==
65 k_num_fpr_registers_arm,
66 "g_fpu_regnums_arm has wrong number of register infos");
67
68 // Number of register sets provided by this context.
69 enum { k_num_register_sets = 2 };
70
71 // Register sets for arm.
72 static const lldb_private::RegisterSet g_reg_sets_arm[k_num_register_sets] = {
73 {"General Purpose Registers", "gpr", k_num_gpr_registers_arm,
74 g_gpr_regnums_arm},
75 {"Floating Point Registers", "fpu", k_num_fpr_registers_arm,
76 g_fpu_regnums_arm}};
77
IsGPR(unsigned reg)78 bool RegisterContextPOSIX_arm::IsGPR(unsigned reg) {
79 return reg <= m_reg_info.last_gpr; // GPR's come first.
80 }
81
IsFPR(unsigned reg)82 bool RegisterContextPOSIX_arm::IsFPR(unsigned reg) {
83 return (m_reg_info.first_fpr <= reg && reg <= m_reg_info.last_fpr);
84 }
85
RegisterContextPOSIX_arm(lldb_private::Thread & thread,uint32_t concrete_frame_idx,lldb_private::RegisterInfoInterface * register_info)86 RegisterContextPOSIX_arm::RegisterContextPOSIX_arm(
87 lldb_private::Thread &thread, uint32_t concrete_frame_idx,
88 lldb_private::RegisterInfoInterface *register_info)
89 : lldb_private::RegisterContext(thread, concrete_frame_idx) {
90 m_register_info_ap.reset(register_info);
91
92 switch (register_info->m_target_arch.GetMachine()) {
93 case llvm::Triple::arm:
94 m_reg_info.num_registers = k_num_registers_arm;
95 m_reg_info.num_gpr_registers = k_num_gpr_registers_arm;
96 m_reg_info.num_fpr_registers = k_num_fpr_registers_arm;
97 m_reg_info.last_gpr = k_last_gpr_arm;
98 m_reg_info.first_fpr = k_first_fpr_arm;
99 m_reg_info.last_fpr = k_last_fpr_arm;
100 m_reg_info.first_fpr_v = fpu_s0_arm;
101 m_reg_info.last_fpr_v = fpu_s31_arm;
102 m_reg_info.gpr_flags = gpr_cpsr_arm;
103 break;
104 default:
105 assert(false && "Unhandled target architecture.");
106 break;
107 }
108
109 ::memset(&m_fpr, 0, sizeof m_fpr);
110 }
111
~RegisterContextPOSIX_arm()112 RegisterContextPOSIX_arm::~RegisterContextPOSIX_arm() {}
113
Invalidate()114 void RegisterContextPOSIX_arm::Invalidate() {}
115
InvalidateAllRegisters()116 void RegisterContextPOSIX_arm::InvalidateAllRegisters() {}
117
GetRegisterOffset(unsigned reg)118 unsigned RegisterContextPOSIX_arm::GetRegisterOffset(unsigned reg) {
119 assert(reg < m_reg_info.num_registers && "Invalid register number.");
120 return GetRegisterInfo()[reg].byte_offset;
121 }
122
GetRegisterSize(unsigned reg)123 unsigned RegisterContextPOSIX_arm::GetRegisterSize(unsigned reg) {
124 assert(reg < m_reg_info.num_registers && "Invalid register number.");
125 return GetRegisterInfo()[reg].byte_size;
126 }
127
GetRegisterCount()128 size_t RegisterContextPOSIX_arm::GetRegisterCount() {
129 size_t num_registers =
130 m_reg_info.num_gpr_registers + m_reg_info.num_fpr_registers;
131 return num_registers;
132 }
133
GetGPRSize()134 size_t RegisterContextPOSIX_arm::GetGPRSize() {
135 return m_register_info_ap->GetGPRSize();
136 }
137
GetRegisterInfo()138 const lldb_private::RegisterInfo *RegisterContextPOSIX_arm::GetRegisterInfo() {
139 // Commonly, this method is overridden and g_register_infos is copied and
140 // specialized. So, use GetRegisterInfo() rather than g_register_infos in
141 // this scope.
142 return m_register_info_ap->GetRegisterInfo();
143 }
144
145 const lldb_private::RegisterInfo *
GetRegisterInfoAtIndex(size_t reg)146 RegisterContextPOSIX_arm::GetRegisterInfoAtIndex(size_t reg) {
147 if (reg < m_reg_info.num_registers)
148 return &GetRegisterInfo()[reg];
149 else
150 return NULL;
151 }
152
GetRegisterSetCount()153 size_t RegisterContextPOSIX_arm::GetRegisterSetCount() {
154 size_t sets = 0;
155 for (size_t set = 0; set < k_num_register_sets; ++set) {
156 if (IsRegisterSetAvailable(set))
157 ++sets;
158 }
159
160 return sets;
161 }
162
163 const lldb_private::RegisterSet *
GetRegisterSet(size_t set)164 RegisterContextPOSIX_arm::GetRegisterSet(size_t set) {
165 if (IsRegisterSetAvailable(set)) {
166 switch (m_register_info_ap->m_target_arch.GetMachine()) {
167 case llvm::Triple::arm:
168 return &g_reg_sets_arm[set];
169 default:
170 assert(false && "Unhandled target architecture.");
171 return NULL;
172 }
173 }
174 return NULL;
175 }
176
GetRegisterName(unsigned reg)177 const char *RegisterContextPOSIX_arm::GetRegisterName(unsigned reg) {
178 assert(reg < m_reg_info.num_registers && "Invalid register offset.");
179 return GetRegisterInfo()[reg].name;
180 }
181
GetByteOrder()182 lldb::ByteOrder RegisterContextPOSIX_arm::GetByteOrder() {
183 // Get the target process whose privileged thread was used for the register
184 // read.
185 lldb::ByteOrder byte_order = lldb::eByteOrderInvalid;
186 lldb_private::Process *process = CalculateProcess().get();
187
188 if (process)
189 byte_order = process->GetByteOrder();
190 return byte_order;
191 }
192
IsRegisterSetAvailable(size_t set_index)193 bool RegisterContextPOSIX_arm::IsRegisterSetAvailable(size_t set_index) {
194 return set_index < k_num_register_sets;
195 }
196
197 // Used when parsing DWARF and EH frame information and any other object file
198 // sections that contain register numbers in them.
ConvertRegisterKindToRegisterNumber(lldb::RegisterKind kind,uint32_t num)199 uint32_t RegisterContextPOSIX_arm::ConvertRegisterKindToRegisterNumber(
200 lldb::RegisterKind kind, uint32_t num) {
201 const uint32_t num_regs = GetRegisterCount();
202
203 assert(kind < lldb::kNumRegisterKinds);
204 for (uint32_t reg_idx = 0; reg_idx < num_regs; ++reg_idx) {
205 const lldb_private::RegisterInfo *reg_info =
206 GetRegisterInfoAtIndex(reg_idx);
207
208 if (reg_info->kinds[kind] == num)
209 return reg_idx;
210 }
211
212 return LLDB_INVALID_REGNUM;
213 }
214