1 //===-- RegisterContextFreeBSDKernel_i386.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_i386.h" 10 11 #include "lldb/Target/Process.h" 12 #include "lldb/Target/Thread.h" 13 #include "lldb/Utility/RegisterValue.h" 14 #include "llvm/Support/Endian.h" 15 16 using namespace lldb; 17 using namespace lldb_private; 18 19 RegisterContextFreeBSDKernel_i386::RegisterContextFreeBSDKernel_i386( 20 Thread &thread, RegisterInfoInterface *register_info, lldb::addr_t pcb_addr) 21 : RegisterContextPOSIX_x86(thread, 0, register_info), m_pcb_addr(pcb_addr) { 22 } 23 24 bool RegisterContextFreeBSDKernel_i386::ReadGPR() { return true; } 25 26 bool RegisterContextFreeBSDKernel_i386::ReadFPR() { return true; } 27 28 bool RegisterContextFreeBSDKernel_i386::WriteGPR() { 29 assert(0); 30 return false; 31 } 32 33 bool RegisterContextFreeBSDKernel_i386::WriteFPR() { 34 assert(0); 35 return false; 36 } 37 38 bool RegisterContextFreeBSDKernel_i386::ReadRegister( 39 const RegisterInfo *reg_info, RegisterValue &value) { 40 if (m_pcb_addr == LLDB_INVALID_ADDRESS) 41 return false; 42 43 struct { 44 llvm::support::ulittle32_t edi; 45 llvm::support::ulittle32_t esi; 46 llvm::support::ulittle32_t ebp; 47 llvm::support::ulittle32_t esp; 48 llvm::support::ulittle32_t ebx; 49 llvm::support::ulittle32_t eip; 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 #define REG(x) \ 61 case lldb_##x##_i386: \ 62 value = pcb.x; \ 63 break; 64 65 REG(edi); 66 REG(esi); 67 REG(ebp); 68 REG(esp); 69 REG(eip); 70 71 #undef REG 72 73 default: 74 return false; 75 } 76 77 return true; 78 } 79 80 bool RegisterContextFreeBSDKernel_i386::WriteRegister( 81 const RegisterInfo *reg_info, const RegisterValue &value) { 82 return false; 83 } 84