AMD x86-64 Architecture Programmer's Manual, Volume 4, 128-Bit ...

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AMD64 Technology 26568—Rev. 3.05—September 2003 (2) An index into an interrupt descriptor table (IDT), used to access exception handlers. Compare exception. virtual-8086 mode A submode of legacy mode. word Two bytes, or 16 bits. x86 See legacy x86. Registers In the following list of registers, the names are used to refer either to a given register or to the contents of that register: AH–DH The high 8-bit AH, BH, CH, and DH registers. Compare AL–DL. AL–DL The low 8-bit AL, BL, CL, and DL registers. Compare AH–DH. AL–r15B The low 8-bit AL, BL, CL, DL, SIL, DIL, BPL, SPL, and R8B–R15B registers, available in 64-bit mode. BP Base pointer register. CRn Control register number n. CS Code segment register. eAX–eSP The 16-bit AX, BX, CX, DX, DI, SI, BP, and SP registers or the 32-bit EAX, EBX, ECX, EDX, EDI, ESI, EBP, and ESP registers. Compare rAX–rSP. EBP Extended base pointer register. EFER Extended features enable register. xxii Preface
26568—Rev. 3.05—September 2003 AMD64 Technology eFLAGS 16-bit or 32-bit flags register. Compare rFLAGS. EFLAGS 32-bit (extended) flags register. eIP 16-bit or 32-bit instruction-pointer register. Compare rIP. EIP 32-bit (extended) instruction-pointer register. FLAGS 16-bit flags register. GDTR Global descriptor table register. GPRs General-purpose registers. For the 16-bit data size, these are AX, BX, CX, DX, DI, SI, BP, and SP. For the 32-bit data size, these are EAX, EBX, ECX, EDX, EDI, ESI, EBP, and ESP. For the 64-bit data size, these include RAX, RBX, RCX, RDX, RDI, RSI, RBP, RSP, and R8–R15. IDTR Interrupt descriptor table register. IP 16-bit instruction-pointer register. LDTR Local descriptor table register. MSR Model-specific register. r8–r15 The 8-bit R8B–R15B registers, or the 16-bit R8W–R15W registers, or the 32-bit R8D–R15D registers, or the 64-bit R8–R15 registers. rAX–rSP The 16-bit AX, BX, CX, DX, DI, SI, BP, and SP registers, or the 32-bit EAX, EBX, ECX, EDX, EDI, ESI, EBP, and ESP registers, or the 64-bit RAX, RBX, RCX, RDX, RDI, RSI, Preface xxiii
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