24.22.4.8.2. gem5 event queue DerivO3CPU syscall emulation freestanding example analysis: hazard
// f = fetch, d = decode, n = rename, p = dispatch, i = issue, c = complete, r = retire

                                     timeline                                             tick          pc.upc     disasm                      seq_num
[.ic.r........................................................................fdn]-(          40000) 0x00400078.0 movz x0, #0, #0           [         1]
[.ic.r........................................................................fdn]-(          40000) 0x0040007c.0 movz x1, #1, #0           [         2]
[....................fdn.ic.r....................................................]-(         120000) 0x00400080.0 movz x2, #2, #0           [         3]
[....................fdn.pic.r...................................................]-(         120000) 0x00400084.0 add x3, x2, #1            [         4]
[....................fdn.ic..r...................................................]-(         120000) 0x00400088.0 movz x4, #4, #0           [         5]
[....................fdn.ic..r...................................................]-(         120000) 0x0040008c.0 movz x5, #5, #0           [         6]
[....................fdn.ic..r...................................................]-(         120000) 0x00400090.0 movz x6, #6, #0           [         7]
[....................fdn.ic..r...................................................]-(         120000) 0x00400094.0 movz x7, #7, #0           [         8]
[....................fdn.ic..r...................................................]-(         120000) 0x00400098.0 movz x8, #8, #0           [         9]
[....................fdn.pic.r...................................................]-(         120000) 0x0040009c.0 movz x9, #9, #0           [        10]
[.....................fdn.ic.r...................................................]-(         120000) 0x004000a0.0 movz x10, #10, #0         [        11]
[.....................fdn.ic..r..................................................]-(         120000) 0x004000a4.0 movz x11, #11, #0         [        12]
[.....................fdn.ic..r..................................................]-(         120000) 0x004000a8.0 movz x12, #12, #0         [        13]
[.....................fdn.ic..r..................................................]-(         120000) 0x004000ac.0 movz x13, #13, #0         [        14]
[.....................fdn.pic.r..................................................]-(         120000) 0x004000b0.0 movz x14, #14, #0         [        15]
[.....................fdn.pic.r..................................................]-(         120000) 0x004000b4.0 movz x15, #15, #0         [        16]
[.....................fdn.pic.r..................................................]-(         120000) 0x004000b8.0 movz x16, #16, #0         [        17]
[.....................fdn.pic.r..................................................]-(         120000) 0x004000bc.0 movz x17, #17, #0         [        18]
[............................................fdn.ic.r............................]-(         160000) 0x004000c0.0 movz x18, #18, #0         [        19]
[............................................fdn.ic.r............................]-(         160000) 0x004000c4.0 movz x19, #19, #0         [        20]
[............................................fdn.ic.r............................]-(         160000) 0x004000c8.0 movz x20, #20, #0         [        21]
[............................................fdn.ic.r............................]-(         160000) 0x004000cc.0 movz x21, #21, #0         [        22]
[............................................fdn.ic.r............................]-(         160000) 0x004000d0.0 movz x22, #22, #0         [        23]
[............................................fdn.ic.r............................]-(         160000) 0x004000d4.0 movz x23, #23, #0         [        24]
[............................................fdn.pic.r...........................]-(         160000) 0x004000d8.0 movz x24, #24, #0         [        25]
[............................................fdn.pic.r...........................]-(         160000) 0x004000dc.0 movz x25, #25, #0         [        26]
[.............................................fdn.ic.r...........................]-(         160000) 0x004000e0.0 movz x0, #0, #0           [        27]
[.............................................fdn.ic.r...........................]-(         160000) 0x004000e4.0 movz x8, #93, #0          [        28]

TODO understand how the hazard happens in detail.