[gem5-users] How are system calls handled in FS mode?

[Balls Mahoney via gem5-users]

I am confused about how system calls work in Full System mode (x86). For
example, in src/arch/x86/isa/decoder/two_byte_opcodes.isa for FS mode only
sysenter() is called (included code below). However, I don't see this
function defined anywhere else. Is this something passed straight to the
kernel? How about when the system call returns? Any guidance would this
would be greatly appreciated.

            0x4: decode FullSystemInt {
                0: SyscallInst::sysenter('xc->syscall(&fault)',
                                         IsSyscall, IsNonSpeculative,
                                         IsSerializeAfter);
                default: sysenter();
            }

Thanks.
- Jon

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