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ARMDefines.h
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1 //===-- ARMDefines.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_PROCESS_UTILITY_ARMDEFINES_H
10 #define LLDB_SOURCE_PLUGINS_PROCESS_UTILITY_ARMDEFINES_H
11 
12 #include "llvm/Support/ErrorHandling.h"
13 
14 #include <cassert>
15 #include <cstdint>
16 
17 // Common definitions for the ARM/Thumb Instruction Set Architecture.
18 
19 namespace lldb_private {
20 
21 // ARM shifter types
29 };
30 
31 // ARM conditions // Meaning (integer) Meaning (floating-point)
32 // Condition flags
33 #define COND_EQ \
34  0x0 // Equal Equal Z == 1
35 #define COND_NE \
36  0x1 // Not equal Not equal, or unordered Z == 0
37 #define COND_CS \
38  0x2 // Carry set >, ==, or unordered C == 1
39 #define COND_HS 0x2
40 #define COND_CC \
41  0x3 // Carry clear Less than C == 0
42 #define COND_LO 0x3
43 #define COND_MI \
44  0x4 // Minus, negative Less than N == 1
45 #define COND_PL \
46  0x5 // Plus, positive or zero >, ==, or unordered N == 0
47 #define COND_VS \
48  0x6 // Overflow Unordered V == 1
49 #define COND_VC \
50  0x7 // No overflow Not unordered V == 0
51 #define COND_HI \
52  0x8 // Unsigned higher Greater than, or unordered C == 1 and Z ==
53  // 0
54 #define COND_LS \
55  0x9 // Unsigned lower or same Less than or equal C == 0 or Z ==
56  // 1
57 #define COND_GE \
58  0xA // Greater than or equal Greater than or equal N == V
59 #define COND_LT \
60  0xB // Less than Less than, or unordered N != V
61 #define COND_GT \
62  0xC // Greater than Greater than Z == 0 and N ==
63  // V
64 #define COND_LE \
65  0xD // Less than or equal <, ==, or unordered Z == 1 or N !=
66  // V
67 #define COND_AL \
68  0xE // Always (unconditional) Always (unconditional) Any
69 #define COND_UNCOND 0xF
70 
71 static inline const char *ARMCondCodeToString(uint32_t CC) {
72  switch (CC) {
73  case COND_EQ:
74  return "eq";
75  case COND_NE:
76  return "ne";
77  case COND_HS:
78  return "hs";
79  case COND_LO:
80  return "lo";
81  case COND_MI:
82  return "mi";
83  case COND_PL:
84  return "pl";
85  case COND_VS:
86  return "vs";
87  case COND_VC:
88  return "vc";
89  case COND_HI:
90  return "hi";
91  case COND_LS:
92  return "ls";
93  case COND_GE:
94  return "ge";
95  case COND_LT:
96  return "lt";
97  case COND_GT:
98  return "gt";
99  case COND_LE:
100  return "le";
101  case COND_AL:
102  return "al";
103  }
104  llvm_unreachable("Unknown condition code");
105 }
106 
107 static inline bool ARMConditionPassed(const uint32_t condition,
108  const uint32_t cpsr) {
109  const uint32_t cpsr_n = (cpsr >> 31) & 1u; // Negative condition code flag
110  const uint32_t cpsr_z = (cpsr >> 30) & 1u; // Zero condition code flag
111  const uint32_t cpsr_c = (cpsr >> 29) & 1u; // Carry condition code flag
112  const uint32_t cpsr_v = (cpsr >> 28) & 1u; // Overflow condition code flag
113 
114  switch (condition) {
115  case COND_EQ:
116  return (cpsr_z == 1);
117  case COND_NE:
118  return (cpsr_z == 0);
119  case COND_CS:
120  return (cpsr_c == 1);
121  case COND_CC:
122  return (cpsr_c == 0);
123  case COND_MI:
124  return (cpsr_n == 1);
125  case COND_PL:
126  return (cpsr_n == 0);
127  case COND_VS:
128  return (cpsr_v == 1);
129  case COND_VC:
130  return (cpsr_v == 0);
131  case COND_HI:
132  return ((cpsr_c == 1) && (cpsr_z == 0));
133  case COND_LS:
134  return ((cpsr_c == 0) || (cpsr_z == 1));
135  case COND_GE:
136  return (cpsr_n == cpsr_v);
137  case COND_LT:
138  return (cpsr_n != cpsr_v);
139  case COND_GT:
140  return ((cpsr_z == 0) && (cpsr_n == cpsr_v));
141  case COND_LE:
142  return ((cpsr_z == 1) || (cpsr_n != cpsr_v));
143  case COND_AL:
144  case COND_UNCOND:
145  default:
146  return true;
147  }
148  return false;
149 }
150 
151 // Bit positions for CPSR
152 #define CPSR_T_POS 5
153 #define CPSR_F_POS 6
154 #define CPSR_I_POS 7
155 #define CPSR_A_POS 8
156 #define CPSR_E_POS 9
157 #define CPSR_J_POS 24
158 #define CPSR_Q_POS 27
159 #define CPSR_V_POS 28
160 #define CPSR_C_POS 29
161 #define CPSR_Z_POS 30
162 #define CPSR_N_POS 31
163 
164 // CPSR mode definitions
165 #define CPSR_MODE_USR 0x10u
166 #define CPSR_MODE_FIQ 0x11u
167 #define CPSR_MODE_IRQ 0x12u
168 #define CPSR_MODE_SVC 0x13u
169 #define CPSR_MODE_ABT 0x17u
170 #define CPSR_MODE_UND 0x1bu
171 #define CPSR_MODE_SYS 0x1fu
172 
173 // Masks for CPSR
174 #define MASK_CPSR_MODE_MASK (0x0000001fu)
175 #define MASK_CPSR_IT_MASK (0x0600fc00u)
176 #define MASK_CPSR_T (1u << CPSR_T_POS)
177 #define MASK_CPSR_F (1u << CPSR_F_POS)
178 #define MASK_CPSR_I (1u << CPSR_I_POS)
179 #define MASK_CPSR_A (1u << CPSR_A_POS)
180 #define MASK_CPSR_E (1u << CPSR_E_POS)
181 #define MASK_CPSR_GE_MASK (0x000f0000u)
182 #define MASK_CPSR_J (1u << CPSR_J_POS)
183 #define MASK_CPSR_Q (1u << CPSR_Q_POS)
184 #define MASK_CPSR_V (1u << CPSR_V_POS)
185 #define MASK_CPSR_C (1u << CPSR_C_POS)
186 #define MASK_CPSR_Z (1u << CPSR_Z_POS)
187 #define MASK_CPSR_N (1u << CPSR_N_POS)
188 
189 } // namespace lldb_private
190 
191 #endif // LLDB_SOURCE_PLUGINS_PROCESS_UTILITY_ARMDEFINES_H
#define COND_LT
Definition: ARMDefines.h:59
A class that represents a running process on the host machine.
#define COND_GE
Definition: ARMDefines.h:57
#define COND_LO
Definition: ARMDefines.h:42
#define COND_GT
Definition: ARMDefines.h:61
#define COND_LS
Definition: ARMDefines.h:54
#define COND_HS
Definition: ARMDefines.h:39
#define COND_CC
Definition: ARMDefines.h:40
#define COND_MI
Definition: ARMDefines.h:43
#define COND_AL
Definition: ARMDefines.h:67
#define COND_UNCOND
Definition: ARMDefines.h:69
#define COND_VS
Definition: ARMDefines.h:47
#define COND_HI
Definition: ARMDefines.h:51
#define COND_CS
Definition: ARMDefines.h:37
#define COND_VC
Definition: ARMDefines.h:49
#define COND_NE
Definition: ARMDefines.h:35
#define COND_EQ
Definition: ARMDefines.h:33
static bool ARMConditionPassed(const uint32_t condition, const uint32_t cpsr)
Definition: ARMDefines.h:107
static const char * ARMCondCodeToString(uint32_t CC)
Definition: ARMDefines.h:71
#define COND_LE
Definition: ARMDefines.h:64
#define COND_PL
Definition: ARMDefines.h:45