1 //===-- RegisterContextFreeBSDKernel_arm64.cpp ----------------------------===// 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 #include "RegisterContextFreeBSDKernel_arm64.h" 10 #include "Plugins/Process/Utility/lldb-arm64-register-enums.h" 11 12 #include "lldb/Target/Process.h" 13 #include "lldb/Target/Thread.h" 14 #include "lldb/Utility/RegisterValue.h" 15 #include "llvm/Support/Endian.h" 16 17 using namespace lldb; 18 using namespace lldb_private; 19 20 RegisterContextFreeBSDKernel_arm64::RegisterContextFreeBSDKernel_arm64( 21 Thread &thread, std::unique_ptr<RegisterInfoPOSIX_arm64> register_info_up, 22 lldb::addr_t pcb_addr) 23 : RegisterContextPOSIX_arm64(thread, std::move(register_info_up)), 24 m_pcb_addr(pcb_addr) {} 25 26 bool RegisterContextFreeBSDKernel_arm64::ReadGPR() { return true; } 27 28 bool RegisterContextFreeBSDKernel_arm64::ReadFPR() { return true; } 29 30 bool RegisterContextFreeBSDKernel_arm64::WriteGPR() { 31 assert(0); 32 return false; 33 } 34 35 bool RegisterContextFreeBSDKernel_arm64::WriteFPR() { 36 assert(0); 37 return false; 38 } 39 40 bool RegisterContextFreeBSDKernel_arm64::ReadRegister( 41 const RegisterInfo *reg_info, RegisterValue &value) { 42 if (m_pcb_addr == LLDB_INVALID_ADDRESS) 43 return false; 44 45 struct { 46 llvm::support::ulittle64_t x[30]; 47 llvm::support::ulittle64_t lr; 48 llvm::support::ulittle64_t _reserved; 49 llvm::support::ulittle64_t sp; 50 } pcb; 51 52 Status error; 53 size_t rd = 54 m_thread.GetProcess()->ReadMemory(m_pcb_addr, &pcb, sizeof(pcb), error); 55 if (rd != sizeof(pcb)) 56 return false; 57 58 uint32_t reg = reg_info->kinds[lldb::eRegisterKindLLDB]; 59 switch (reg) { 60 case gpr_x0_arm64: 61 case gpr_x1_arm64: 62 case gpr_x2_arm64: 63 case gpr_x3_arm64: 64 case gpr_x4_arm64: 65 case gpr_x5_arm64: 66 case gpr_x6_arm64: 67 case gpr_x7_arm64: 68 case gpr_x8_arm64: 69 case gpr_x9_arm64: 70 case gpr_x10_arm64: 71 case gpr_x11_arm64: 72 case gpr_x12_arm64: 73 case gpr_x13_arm64: 74 case gpr_x14_arm64: 75 case gpr_x15_arm64: 76 case gpr_x16_arm64: 77 case gpr_x17_arm64: 78 case gpr_x18_arm64: 79 case gpr_x19_arm64: 80 case gpr_x20_arm64: 81 case gpr_x21_arm64: 82 case gpr_x22_arm64: 83 case gpr_x23_arm64: 84 case gpr_x24_arm64: 85 case gpr_x25_arm64: 86 case gpr_x26_arm64: 87 case gpr_x27_arm64: 88 case gpr_x28_arm64: 89 case gpr_fp_arm64: 90 static_assert(gpr_fp_arm64 - gpr_x0_arm64 == 29, 91 "nonconsecutive arm64 register numbers"); 92 value = pcb.x[reg - gpr_x0_arm64]; 93 break; 94 case gpr_sp_arm64: 95 value = pcb.sp; 96 break; 97 case gpr_pc_arm64: 98 // The pc of crashing thread is stored in lr. 99 value = pcb.lr; 100 break; 101 default: 102 return false; 103 } 104 return true; 105 } 106 107 bool RegisterContextFreeBSDKernel_arm64::WriteRegister( 108 const RegisterInfo *reg_info, const RegisterValue &value) { 109 return false; 110 } 111