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AMD64 Technology 24594 Rev. 3.10 February 2005• RFLAGS.RF is cleared to 0.For further details on the SYSCALL and SYSRET instructions and their associatedMSR registers (STAR, LSTAR, CSTAR, and SYSCALL_FLAG_MASK), see “FastSystem Call and Return” in Volume 2.Mnemonic Opcode DescriptionSYSCALL 0F 05 Call operating system.Action// See “Pseudocode Definitions” on page 49.SYSCALL_START:IF (MSR_EFER.SCE = 0)EXCEPTION [#UD]// Check if syscall/sysret are enabled.IF (LONG_MODE)SYSCALL_LONG_MODEELSE // (LEGACY_MODE)SYSCALL_LEGACY_MODESYSCALL_LONG_MODE:RCX.q = next_RIPR11.q = RFLAGS// with rf clearedIF (64BIT_MODE)temp_RIP.q = MSR_LSTARELSE // (COMPATIBILITY_MODE)temp_RIP.q = MSR_CSTARCS.sel = MSR_STAR.SYSCALL_CS AND 0xFFFCCS.attr = 64-bit code,dpl0 // Always switch to 64-bit mode in long mode.CS.base = 0x00000000CS.limit = 0xFFFFFFFFSS.sel = MSR_STAR.SYSCALL_CS + 8SS.attr = 64-bit stack,dpl0SS.base = 0x00000000SS.limit = 0xFFFFFFFFRFLAGS = RFLAGS AND ~MSR_SFMASKRFLAGS.RF = 0CPL = 0356 SYSCALL
24594 Rev. 3.10 February 2005 AMD64 TechnologyRIP = temp_RIPEXITSYSCALL_LEGACY_MODE:RCX.d = next_RIPtemp_RIP.d = MSR_STAR.EIPCS.sel = MSR_STAR.SYSCALL_CS AND 0xFFFCCS.attr = 32-bit code,dpl0 // Always switch to 32-bit mode in legacy mode.CS.base = 0x00000000CS.limit = 0xFFFFFFFFSS.sel = MSR_STAR.SYSCALL_CS + 8SS.attr = 32-bit stack,dpl0SS.base = 0x00000000SS.limit = 0xFFFFFFFFRFLAGS.VM,IF,RF=0CPL = 0RIP = temp_RIPEXITRelated InstructionsSYSRET, SYSENTER, SYSEXITrFLAGS AffectedID VIP VIF AC VM RF NT IOPL OF DF IF TF SF ZF AF PF CFM M M M 0 0 M M M M M M M M M M M21 20 19 18 17 16 14 13–12 11 10 9 8 7 6 4 2 0Note: Bits 31–22, 15, 5, 3, and 1 are reserved. A flag set to one or cleared to zero is M (modified). Unaffected flags are blank. Undefinedflags are U.SYSCALL 357
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