1 /** @file 2 IA32 CPU Exception Handler functons. 3 4 Copyright (c) 2012 - 2016, Intel Corporation. All rights reserved.<BR> 5 This program and the accompanying materials 6 are licensed and made available under the terms and conditions of the BSD License 7 which accompanies this distribution. The full text of the license may be found at 8 http://opensource.org/licenses/bsd-license.php 9 10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 12 13 **/ 14 15 #include "CpuExceptionCommon.h" 16 17 /** 18 Return address map of exception handler template so that C code can generate 19 exception tables. 20 21 @param IdtEntry Pointer to IDT entry to be updated. 22 @param InterruptHandler IDT handler value. 23 24 **/ 25 VOID 26 ArchUpdateIdtEntry ( 27 IN IA32_IDT_GATE_DESCRIPTOR *IdtEntry, 28 IN UINTN InterruptHandler 29 ) 30 { 31 IdtEntry->Bits.OffsetLow = (UINT16)(UINTN)InterruptHandler; 32 IdtEntry->Bits.OffsetHigh = (UINT16)((UINTN)InterruptHandler >> 16); 33 IdtEntry->Bits.GateType = IA32_IDT_GATE_TYPE_INTERRUPT_32; 34 } 35 36 /** 37 Read IDT handler value from IDT entry. 38 39 @param IdtEntry Pointer to IDT entry to be read. 40 41 **/ 42 UINTN 43 ArchGetIdtHandler ( 44 IN IA32_IDT_GATE_DESCRIPTOR *IdtEntry 45 ) 46 { 47 return (UINTN)IdtEntry->Bits.OffsetLow + (((UINTN)IdtEntry->Bits.OffsetHigh) << 16); 48 } 49 50 /** 51 Save CPU exception context when handling EFI_VECTOR_HANDOFF_HOOK_AFTER case. 52 53 @param[in] ExceptionType Exception type. 54 @param[in] SystemContext Pointer to EFI_SYSTEM_CONTEXT. 55 @param[in] ExceptionHandlerData Pointer to exception handler data. 56 **/ 57 VOID 58 ArchSaveExceptionContext ( 59 IN UINTN ExceptionType, 60 IN EFI_SYSTEM_CONTEXT SystemContext, 61 IN EXCEPTION_HANDLER_DATA *ExceptionHandlerData 62 ) 63 { 64 IA32_EFLAGS32 Eflags; 65 RESERVED_VECTORS_DATA *ReservedVectors; 66 67 ReservedVectors = ExceptionHandlerData->ReservedVectors; 68 // 69 // Save Exception context in global variable 70 // 71 ReservedVectors[ExceptionType].OldFlags = SystemContext.SystemContextIa32->Eflags; 72 ReservedVectors[ExceptionType].OldCs = SystemContext.SystemContextIa32->Cs; 73 ReservedVectors[ExceptionType].OldIp = SystemContext.SystemContextIa32->Eip; 74 ReservedVectors[ExceptionType].ExceptionData = SystemContext.SystemContextIa32->ExceptionData; 75 // 76 // Clear IF flag to avoid old IDT handler enable interrupt by IRET 77 // 78 Eflags.UintN = SystemContext.SystemContextIa32->Eflags; 79 Eflags.Bits.IF = 0; 80 SystemContext.SystemContextIa32->Eflags = Eflags.UintN; 81 // 82 // Modify the EIP in stack, then old IDT handler will return to the stub code 83 // 84 SystemContext.SystemContextIa32->Eip = (UINTN) ReservedVectors[ExceptionType].HookAfterStubHeaderCode; 85 } 86 87 /** 88 Restore CPU exception context when handling EFI_VECTOR_HANDOFF_HOOK_AFTER case. 89 90 @param[in] ExceptionType Exception type. 91 @param[in] SystemContext Pointer to EFI_SYSTEM_CONTEXT. 92 @param[in] ExceptionHandlerData Pointer to exception handler data. 93 **/ 94 VOID 95 ArchRestoreExceptionContext ( 96 IN UINTN ExceptionType, 97 IN EFI_SYSTEM_CONTEXT SystemContext, 98 IN EXCEPTION_HANDLER_DATA *ExceptionHandlerData 99 ) 100 { 101 RESERVED_VECTORS_DATA *ReservedVectors; 102 103 ReservedVectors = ExceptionHandlerData->ReservedVectors; 104 SystemContext.SystemContextIa32->Eflags = ReservedVectors[ExceptionType].OldFlags; 105 SystemContext.SystemContextIa32->Cs = ReservedVectors[ExceptionType].OldCs; 106 SystemContext.SystemContextIa32->Eip = ReservedVectors[ExceptionType].OldIp; 107 SystemContext.SystemContextIa32->ExceptionData = ReservedVectors[ExceptionType].ExceptionData; 108 } 109 110 /** 111 Display CPU information. 112 113 @param ExceptionType Exception type. 114 @param SystemContext Pointer to EFI_SYSTEM_CONTEXT. 115 **/ 116 VOID 117 DumpCpuContent ( 118 IN EFI_EXCEPTION_TYPE ExceptionType, 119 IN EFI_SYSTEM_CONTEXT SystemContext 120 ) 121 { 122 UINTN ImageBase; 123 UINTN EntryPoint; 124 125 InternalPrintMessage ( 126 "!!!! IA32 Exception Type - %02x(%a) CPU Apic ID - %08x !!!!\n", 127 ExceptionType, 128 GetExceptionNameStr (ExceptionType), 129 GetApicId () 130 ); 131 132 InternalPrintMessage ( 133 "EIP - %08x, CS - %08x, EFLAGS - %08x\n", 134 SystemContext.SystemContextIa32->Eip, 135 SystemContext.SystemContextIa32->Cs, 136 SystemContext.SystemContextIa32->Eflags 137 ); 138 if ((mErrorCodeFlag & (1 << ExceptionType)) != 0) { 139 InternalPrintMessage ( 140 "ExceptionData - %08x\n", 141 SystemContext.SystemContextIa32->ExceptionData 142 ); 143 } 144 InternalPrintMessage ( 145 "EAX - %08x, ECX - %08x, EDX - %08x, EBX - %08x\n", 146 SystemContext.SystemContextIa32->Eax, 147 SystemContext.SystemContextIa32->Ecx, 148 SystemContext.SystemContextIa32->Edx, 149 SystemContext.SystemContextIa32->Ebx 150 ); 151 InternalPrintMessage ( 152 "ESP - %08x, EBP - %08x, ESI - %08x, EDI - %08x\n", 153 SystemContext.SystemContextIa32->Esp, 154 SystemContext.SystemContextIa32->Ebp, 155 SystemContext.SystemContextIa32->Esi, 156 SystemContext.SystemContextIa32->Edi 157 ); 158 InternalPrintMessage ( 159 "DS - %08x, ES - %08x, FS - %08x, GS - %08x, SS - %08x\n", 160 SystemContext.SystemContextIa32->Ds, 161 SystemContext.SystemContextIa32->Es, 162 SystemContext.SystemContextIa32->Fs, 163 SystemContext.SystemContextIa32->Gs, 164 SystemContext.SystemContextIa32->Ss 165 ); 166 InternalPrintMessage ( 167 "CR0 - %08x, CR2 - %08x, CR3 - %08x, CR4 - %08x\n", 168 SystemContext.SystemContextIa32->Cr0, 169 SystemContext.SystemContextIa32->Cr2, 170 SystemContext.SystemContextIa32->Cr3, 171 SystemContext.SystemContextIa32->Cr4 172 ); 173 InternalPrintMessage ( 174 "DR0 - %08x, DR1 - %08x, DR2 - %08x, DR3 - %08x\n", 175 SystemContext.SystemContextIa32->Dr0, 176 SystemContext.SystemContextIa32->Dr1, 177 SystemContext.SystemContextIa32->Dr2, 178 SystemContext.SystemContextIa32->Dr3 179 ); 180 InternalPrintMessage ( 181 "DR6 - %08x, DR7 - %08x\n", 182 SystemContext.SystemContextIa32->Dr6, 183 SystemContext.SystemContextIa32->Dr7 184 ); 185 InternalPrintMessage ( 186 "GDTR - %08x %08x, IDTR - %08x %08x\n", 187 SystemContext.SystemContextIa32->Gdtr[0], 188 SystemContext.SystemContextIa32->Gdtr[1], 189 SystemContext.SystemContextIa32->Idtr[0], 190 SystemContext.SystemContextIa32->Idtr[1] 191 ); 192 InternalPrintMessage ( 193 "LDTR - %08x, TR - %08x\n", 194 SystemContext.SystemContextIa32->Ldtr, 195 SystemContext.SystemContextIa32->Tr 196 ); 197 InternalPrintMessage ( 198 "FXSAVE_STATE - %08x\n", 199 &SystemContext.SystemContextIa32->FxSaveState 200 ); 201 202 // 203 // Find module image base and module entry point by RIP 204 // 205 ImageBase = FindModuleImageBase (SystemContext.SystemContextIa32->Eip, &EntryPoint); 206 if (ImageBase != 0) { 207 InternalPrintMessage ( 208 " (ImageBase=%08x, EntryPoint=%08x) !!!!\n", 209 ImageBase, 210 EntryPoint 211 ); 212 } 213 } 214
