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//===-- ARMDefines.h --------------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef LLDB_SOURCE_PLUGINS_PROCESS_UTILITY_ARMDEFINES_H
#define LLDB_SOURCE_PLUGINS_PROCESS_UTILITY_ARMDEFINES_H
#include "llvm/Support/ErrorHandling.h"
#include <cassert>
#include <cstdint>
// Common definitions for the ARM/Thumb Instruction Set Architecture.
namespace lldb_private {
// ARM shifter types
enum ARM_ShifterType {
SRType_LSL,
SRType_LSR,
SRType_ASR,
SRType_ROR,
SRType_RRX,
SRType_Invalid
};
// ARM conditions // Meaning (integer) Meaning (floating-point)
// Condition flags
#define COND_EQ \
0x0 // Equal Equal Z == 1
#define COND_NE \
0x1 // Not equal Not equal, or unordered Z == 0
#define COND_CS \
0x2 // Carry set >, ==, or unordered C == 1
#define COND_HS 0x2
#define COND_CC \
0x3 // Carry clear Less than C == 0
#define COND_LO 0x3
#define COND_MI \
0x4 // Minus, negative Less than N == 1
#define COND_PL \
0x5 // Plus, positive or zero >, ==, or unordered N == 0
#define COND_VS \
0x6 // Overflow Unordered V == 1
#define COND_VC \
0x7 // No overflow Not unordered V == 0
#define COND_HI \
0x8 // Unsigned higher Greater than, or unordered C == 1 and Z ==
// 0
#define COND_LS \
0x9 // Unsigned lower or same Less than or equal C == 0 or Z ==
// 1
#define COND_GE \
0xA // Greater than or equal Greater than or equal N == V
#define COND_LT \
0xB // Less than Less than, or unordered N != V
#define COND_GT \
0xC // Greater than Greater than Z == 0 and N ==
// V
#define COND_LE \
0xD // Less than or equal <, ==, or unordered Z == 1 or N !=
// V
#define COND_AL \
0xE // Always (unconditional) Always (unconditional) Any
#define COND_UNCOND 0xF
static inline const char *ARMCondCodeToString(uint32_t CC) {
switch (CC) {
case COND_EQ:
return "eq";
case COND_NE:
return "ne";
case COND_HS:
return "hs";
case COND_LO:
return "lo";
case COND_MI:
return "mi";
case COND_PL:
return "pl";
case COND_VS:
return "vs";
case COND_VC:
return "vc";
case COND_HI:
return "hi";
case COND_LS:
return "ls";
case COND_GE:
return "ge";
case COND_LT:
return "lt";
case COND_GT:
return "gt";
case COND_LE:
return "le";
case COND_AL:
return "al";
}
llvm_unreachable("Unknown condition code");
}
static inline bool ARMConditionPassed(const uint32_t condition,
const uint32_t cpsr) {
const uint32_t cpsr_n = (cpsr >> 31) & 1u; // Negative condition code flag
const uint32_t cpsr_z = (cpsr >> 30) & 1u; // Zero condition code flag
const uint32_t cpsr_c = (cpsr >> 29) & 1u; // Carry condition code flag
const uint32_t cpsr_v = (cpsr >> 28) & 1u; // Overflow condition code flag
switch (condition) {
case COND_EQ:
return (cpsr_z == 1);
case COND_NE:
return (cpsr_z == 0);
case COND_CS:
return (cpsr_c == 1);
case COND_CC:
return (cpsr_c == 0);
case COND_MI:
return (cpsr_n == 1);
case COND_PL:
return (cpsr_n == 0);
case COND_VS:
return (cpsr_v == 1);
case COND_VC:
return (cpsr_v == 0);
case COND_HI:
return ((cpsr_c == 1) && (cpsr_z == 0));
case COND_LS:
return ((cpsr_c == 0) || (cpsr_z == 1));
case COND_GE:
return (cpsr_n == cpsr_v);
case COND_LT:
return (cpsr_n != cpsr_v);
case COND_GT:
return ((cpsr_z == 0) && (cpsr_n == cpsr_v));
case COND_LE:
return ((cpsr_z == 1) || (cpsr_n != cpsr_v));
case COND_AL:
case COND_UNCOND:
default:
return true;
}
return false;
}
// Bit positions for CPSR
#define CPSR_T_POS 5
#define CPSR_F_POS 6
#define CPSR_I_POS 7
#define CPSR_A_POS 8
#define CPSR_E_POS 9
#define CPSR_J_POS 24
#define CPSR_Q_POS 27
#define CPSR_V_POS 28
#define CPSR_C_POS 29
#define CPSR_Z_POS 30
#define CPSR_N_POS 31
// CPSR mode definitions
#define CPSR_MODE_USR 0x10u
#define CPSR_MODE_FIQ 0x11u
#define CPSR_MODE_IRQ 0x12u
#define CPSR_MODE_SVC 0x13u
#define CPSR_MODE_ABT 0x17u
#define CPSR_MODE_UND 0x1bu
#define CPSR_MODE_SYS 0x1fu
// Masks for CPSR
#define MASK_CPSR_MODE_MASK (0x0000001fu)
#define MASK_CPSR_IT_MASK (0x0600fc00u)
#define MASK_CPSR_T (1u << CPSR_T_POS)
#define MASK_CPSR_F (1u << CPSR_F_POS)
#define MASK_CPSR_I (1u << CPSR_I_POS)
#define MASK_CPSR_A (1u << CPSR_A_POS)
#define MASK_CPSR_E (1u << CPSR_E_POS)
#define MASK_CPSR_GE_MASK (0x000f0000u)
#define MASK_CPSR_J (1u << CPSR_J_POS)
#define MASK_CPSR_Q (1u << CPSR_Q_POS)
#define MASK_CPSR_V (1u << CPSR_V_POS)
#define MASK_CPSR_C (1u << CPSR_C_POS)
#define MASK_CPSR_Z (1u << CPSR_Z_POS)
#define MASK_CPSR_N (1u << CPSR_N_POS)
} // namespace lldb_private
#endif // LLDB_SOURCE_PLUGINS_PROCESS_UTILITY_ARMDEFINES_H
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