Hi all, I was trying to run a gem5 simulation using the O3CPU but encountered problems with gem5 "panic" when running with the "Exec" debug flags enabled. I have built gem5 for the x86 ISA, and am using the stable branch. The full log can be found in the zip linked below (crash_debug_log). The error in the log seems to be related to this: build/X86/arch/x86/insts/static_inst.cc:253: panic: Unrecognized register class.
On further debugging, it seems that the register class value is being set to -1: .... 7335000: system.cpu: T0 : 0x7ffff801bbdd @_end+140737354234813. 2 : CALL_NEAR_I : stis t7, SS:[rsp + 0xfffffffffffffff8] : MemWrite : D=0x00007ffff801bbe2 A=0x7fffffffed48 7335000: system.cpu: T0 : 0x7ffff801bbdd @_end+140737354234813. 3 : CALL_NEAR_I : subi rsp, rsp, 0x8 : IntAlu : D=0x00007fffffffed48 7335000: system.cpu: T0 : 0x7ffff801bbdd @_end+140737354234813. 4 : CALL_NEAR_I : wrip t7, t1 : IntAlu : 7447000: system.cpu: T0 : 0x7ffff801d080 @_end+140737354240096 : hint 7447000: system.cpu: T0 : 0x7ffff801d080 @_end+140737354240096. 0 : HINT_NOP : fault NoFault : No_OpClass : 7447000: system.cpu: T0 : 0x7ffff801d084 @_end+140737354240100 : mov eax, 0xc 7447000: system.cpu: T0 : 0x7ffff801d084 @_end+140737354240100. 0 : MOV_R_I : limm eax, 0xc : IntAlu : D=0x000000000000000c build/X86/arch/x86/insts/static_inst.cc:254: panic: Unknown register class: -854770912 (reg.classValue()) Memory Usage: 632228 KBytes Program aborted at tick 7455000 --- BEGIN LIBC BACKTRACE --- .... The error does not appear when using no debug flags or using flags like 'IEW'. The command used to run the simulation is: ../build/X86/gem5.opt --debug-flags=Exec DAXPY-newCPU.py daxpy --cpu O3CPU If needed, you can find the related files here: https://drive.google.com/file/d/1Sxg-c9Gy0NU2r3_nd88A_le18C5RkuR_/view?usp=sharing I would appreciate any help on this. Best, Nirmit
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