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AMD64 Technology 24594 Rev. 3.10 February 2005ELSE...IF ((FOO && BAR) || (CONE && HEAD)).../////////////////////////////////////////////////////////////////////////////////// Exceptions/////////////////////////////////////////////////////////////////////////////////EXCEPTION [#GP(0)]EXCEPTION [#UD]// error code in parenthesis// if no error codepossible exception types:#DE // Divide-By-Zero-Error Exception (Vector 0)#DB // Debug Exception (Vector 1)#BP // INT3 Breakpoint Exception (Vector 3)#OF // INTO Overflow Exception (Vector 4)#BR // Bound-Range Exception (Vector 5)#UD // Invalid-Opcode Exception (Vector 6)#NM // Device-Not-Available Exception (Vector 7)#DF // Double-Fault Exception (Vector 8)#TS // Invalid-TSS Exception (Vector 10)#NP // Segment-Not-Present Exception (Vector 11)#SS // Stack Exception (Vector 12)#GP // General-Protection Exception (Vector 13)#PF // Page-Fault Exception (Vector 14)#MF // x87 Floating-Point Exception-Pending (Vector 16)#AC // Alignment-Check Exception (Vector 17)#MC // Machine-Check Exception (Vector 18)#XF // SIMD Floating-Point Exception (Vector 19)/////////////////////////////////////////////////////////////////////////////////// READ_MEM// General memory read. This zero-extends the data to 64 bits and returns it./////////////////////////////////////////////////////////////////////////////////usage:temp = READ_MEM.x [seg:offset] // where x is one of {v, z, b, w, d, q}// and denotes the size of the memory readdefinition:IF ((seg AND 0xFFFC) = NULL)EXCEPTION [#GP(0)]// GP fault for using a null segment to// reference memoryIF ((seg=CS) || (seg=DS) || (seg=ES) || (seg=FS) || (seg=GS))52 Chapter 2: Instruction Overview
24594 Rev. 3.10 February 2005 AMD64 Technology// CS,DS,ES,FS,GS check for segment limit or canonicalIF ((!64BIT_MODE) && (offset is outside seg’s limit))EXCEPTION [#GP(0)]// #GP fault for segment limit violation in non-64-bit modeIF ((64BIT_MODE) && (offset is non-canonical))EXCEPTION [#GP(0)]// #GP fault for non-canonical address in 64-bit modeELSIF (seg=SS) // SS checks for segment limit or canonicalIF ((!64BIT_MODE) && (offset is outside seg’s limit))EXCEPTION [#SS(0)]// stack fault for segment limit violation in non-64-bit modeIF ((64BIT_MODE) && (offset is non-canonical))EXCEPTION [#SS(0)]// stack fault for non-canonical address in 64-bit modeELSE // ((seg=GDT) || (seg=LDT) || (seg=IDT) || (seg=TSS))// GDT,LDT,IDT,TSS check for segment limit and canonicalIF (offset > seg.limit)EXCEPTION [#GP(0)] // #GP fault for segment limit violation// in all modesIF ((LONG_MODE) && (offset is non-canonical))EXCEPTION [#GP(0)] // #GP fault for non-canonical address in long modeIF ((ALIGNMENT_CHECK_ENABLED) && (offset misaligned, considering itssize and alignment))EXCEPTION [#AC(0)]IF ((64_bit_mode) && ((seg=CS) || (seg=DS) || (seg=ES) || (seg=SS))temp_linear = offsetELSEtemp_linear = seg.base + offsetIF ((PAGING_ENABLED) && (virtual-to-physical translation for temp_linearresults in a page-protection violation))EXCEPTION [#PF(error_code)] // page fault for page-protection violation// (U/S violation, Reserved bit violation)IF ((PAGING_ENABLED) && (temp_linear is on a not-present page))EXCEPTION [#PF(error_code)] // page fault for not-present pagetemp_data = memory [temp_linear].x // zero-extends the data to 64// bits, and saves it in temp_dataRETURN (temp_data)// return the zero-extended data/////////////////////////////////////////////////////////////////////////////////// WRITE_MEM // General memory write/////////////////////////////////////////////////////////////////////////////////usage:WRITE_MEM.x [seg:offset] = temp.x// where is one of these:Chapter 2: Instruction Overview 53
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