1 /** @file 2 IA32 CPU Exception Handler functons. 3 4 Copyright (c) 2012 - 2015, 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 ExceptionType Exception type. 54 @param SystemContext Pointer to EFI_SYSTEM_CONTEXT. 55 56 **/ 57 VOID 58 ArchSaveExceptionContext ( 59 IN UINTN ExceptionType, 60 IN EFI_SYSTEM_CONTEXT SystemContext 61 ) 62 { 63 IA32_EFLAGS32 Eflags; 64 // 65 // Save Exception context in global variable 66 // 67 mReservedVectors[ExceptionType].OldFlags = SystemContext.SystemContextIa32->Eflags; 68 mReservedVectors[ExceptionType].OldCs = SystemContext.SystemContextIa32->Cs; 69 mReservedVectors[ExceptionType].OldIp = SystemContext.SystemContextIa32->Eip; 70 mReservedVectors[ExceptionType].ExceptionData = SystemContext.SystemContextIa32->ExceptionData; 71 // 72 // Clear IF flag to avoid old IDT handler enable interrupt by IRET 73 // 74 Eflags.UintN = SystemContext.SystemContextIa32->Eflags; 75 Eflags.Bits.IF = 0; 76 SystemContext.SystemContextIa32->Eflags = Eflags.UintN; 77 // 78 // Modify the EIP in stack, then old IDT handler will return to the stub code 79 // 80 SystemContext.SystemContextIa32->Eip = (UINTN) mReservedVectors[ExceptionType].HookAfterStubHeaderCode; 81 } 82 83 /** 84 Restore CPU exception context when handling EFI_VECTOR_HANDOFF_HOOK_AFTER case. 85 86 @param ExceptionType Exception type. 87 @param SystemContext Pointer to EFI_SYSTEM_CONTEXT. 88 **/ 89 VOID 90 ArchRestoreExceptionContext ( 91 IN UINTN ExceptionType, 92 IN EFI_SYSTEM_CONTEXT SystemContext 93 ) 94 { 95 SystemContext.SystemContextIa32->Eflags = mReservedVectors[ExceptionType].OldFlags; 96 SystemContext.SystemContextIa32->Cs = mReservedVectors[ExceptionType].OldCs; 97 SystemContext.SystemContextIa32->Eip = mReservedVectors[ExceptionType].OldIp; 98 SystemContext.SystemContextIa32->ExceptionData = mReservedVectors[ExceptionType].ExceptionData; 99 } 100 101 /** 102 Display CPU information. 103 104 @param ExceptionType Exception type. 105 @param SystemContext Pointer to EFI_SYSTEM_CONTEXT. 106 **/ 107 VOID 108 DumpCpuContent ( 109 IN EFI_EXCEPTION_TYPE ExceptionType, 110 IN EFI_SYSTEM_CONTEXT SystemContext 111 ) 112 { 113 UINTN ImageBase; 114 UINTN EntryPoint; 115 116 InternalPrintMessage ( 117 "!!!! IA32 Exception Type - %02x(%a) CPU Apic ID - %08x !!!!\n", 118 ExceptionType, 119 GetExceptionNameStr (ExceptionType), 120 GetApicId () 121 ); 122 123 InternalPrintMessage ( 124 "EIP - %08x, CS - %08x, EFLAGS - %08x\n", 125 SystemContext.SystemContextIa32->Eip, 126 SystemContext.SystemContextIa32->Cs, 127 SystemContext.SystemContextIa32->Eflags 128 ); 129 if ((mErrorCodeFlag & (1 << ExceptionType)) != 0) { 130 InternalPrintMessage ( 131 "ExceptionData - %08x\n", 132 SystemContext.SystemContextIa32->ExceptionData 133 ); 134 } 135 InternalPrintMessage ( 136 "EAX - %08x, ECX - %08x, EDX - %08x, EBX - %08x\n", 137 SystemContext.SystemContextIa32->Eax, 138 SystemContext.SystemContextIa32->Ecx, 139 SystemContext.SystemContextIa32->Edx, 140 SystemContext.SystemContextIa32->Ebx 141 ); 142 InternalPrintMessage ( 143 "ESP - %08x, EBP - %08x, ESI - %08x, EDI - %08x\n", 144 SystemContext.SystemContextIa32->Esp, 145 SystemContext.SystemContextIa32->Ebp, 146 SystemContext.SystemContextIa32->Esi, 147 SystemContext.SystemContextIa32->Edi 148 ); 149 InternalPrintMessage ( 150 "DS - %08x, ES - %08x, FS - %08x, GS - %08x, SS - %08x\n", 151 SystemContext.SystemContextIa32->Ds, 152 SystemContext.SystemContextIa32->Es, 153 SystemContext.SystemContextIa32->Fs, 154 SystemContext.SystemContextIa32->Gs, 155 SystemContext.SystemContextIa32->Ss 156 ); 157 InternalPrintMessage ( 158 "CR0 - %08x, CR2 - %08x, CR3 - %08x, CR4 - %08x\n", 159 SystemContext.SystemContextIa32->Cr0, 160 SystemContext.SystemContextIa32->Cr2, 161 SystemContext.SystemContextIa32->Cr3, 162 SystemContext.SystemContextIa32->Cr4 163 ); 164 InternalPrintMessage ( 165 "DR0 - %08x, DR1 - %08x, DR2 - %08x, DR3 - %08x\n", 166 SystemContext.SystemContextIa32->Dr0, 167 SystemContext.SystemContextIa32->Dr1, 168 SystemContext.SystemContextIa32->Dr2, 169 SystemContext.SystemContextIa32->Dr3 170 ); 171 InternalPrintMessage ( 172 "DR6 - %08x, DR7 - %08x\n", 173 SystemContext.SystemContextIa32->Dr6, 174 SystemContext.SystemContextIa32->Dr7 175 ); 176 InternalPrintMessage ( 177 "GDTR - %08x %08x, IDTR - %08x %08x\n", 178 SystemContext.SystemContextIa32->Gdtr[0], 179 SystemContext.SystemContextIa32->Gdtr[1], 180 SystemContext.SystemContextIa32->Idtr[0], 181 SystemContext.SystemContextIa32->Idtr[1] 182 ); 183 InternalPrintMessage ( 184 "LDTR - %08x, TR - %08x\n", 185 SystemContext.SystemContextIa32->Ldtr, 186 SystemContext.SystemContextIa32->Tr 187 ); 188 InternalPrintMessage ( 189 "FXSAVE_STATE - %08x\n", 190 &SystemContext.SystemContextIa32->FxSaveState 191 ); 192 193 // 194 // Find module image base and module entry point by RIP 195 // 196 ImageBase = FindModuleImageBase (SystemContext.SystemContextIa32->Eip, &EntryPoint); 197 if (ImageBase != 0) { 198 InternalPrintMessage ( 199 " (ImageBase=%08x, EntryPoint=%08x) !!!!\n", 200 ImageBase, 201 EntryPoint 202 ); 203 } 204 } 205
