Sandsifter software finds hidden instructions inside processors.

[skybuck2000 at hotmail.com]

On Tuesday, October 24, 2017 at 1:13:22 AM UTC+2, MRAB wrote:
> On 2017-10-23 23:50, skybuck2000 at hotmail.com wrote:
> > Question:
> > 
> > What do the letters
> > 
> > #                               v  l  s  c
> > 
> > Stand for in this source code ?
> > 
> > v = not valid/valid
> > l = length
> > s = ?
> > c = ?
> > 
> > If somebody with lots of python experience could dive into this code and then tell me I'd be most gratefull ! :)
> > 
> > 
> > 
> > #
> > # ./sifter.py --unk --dis --len --sync --tick -- -P1 -t
> > # ./injector -P1 -t -t -R -0 -s 4293486582
> > #
> > # insn tested: 129563
> > # artf found:  0
> > # runtime:     00:00:04.23
> > # seed:        4293486582
> > # arch:        64
> > # date:        2017-10-22 16:10:51
> > #
> > # cpu:
> > # processor	: 0
> > # vendor_id	: AuthenticAMD
> > # cpu family	: 15
> > # model		: 43
> > # model name	: AMD Athlon(tm) 64 X2 Dual Core Processor 3800+
> > # stepping	: 1
> > # microcode	: 0x4d
> > #                               v  l  s  c
> >                          0f0d00  1  3  5  2 (0f0d0000000000000000000000000000)
> >                          0f0d01  1  3  5  2 (0f0d0100000000000000000000000000)
> >                          0f0d02  1  3  5  2 (0f0d0200000000000000000000000000)
> >                          0f0d03  1  3  5  2 (0f0d0300000000000000000000000000)
> >                        0f0d0400  1  4  5  2 (0f0d0400000000000000000000000000)
> >                        0f0d0401  1  4  5  2 (0f0d0401000000000000000000000000)
> >                        0f0d0402  1  4  5  2 (0f0d0402000000000000000000000000)
> >                        0f0d0403  1  4  5  2 (0f0d0403000000000000000000000000)
> >                        0f0d0404  1  4  5  2 (0f0d0404000000000000000000000000)
> >                0f0d040500000000  1  8  5  2 (0f0d0405000000000000000000000000)
> >                0f0d040501000000  1  8  5  2 (0f0d0405010000000000000000000000)
> >                0f0d040502000000  1  8  5  2 (0f0d0405020000000000000000000000)
> >                0f0d040503000000  1  8  5  2 (0f0d0405030000000000000000000000)
> >                0f0d040504000000  1  8  5  2 (0f0d0405040000000000000000000000)
> > 
> > Bye,
> >    Skybuck.
> > 
> 
> v = valid
> l = length
> s = signum
> c = sicode

Thank you, at least signum seems correct, I will investigate sicode later !;)

So far found this tabel describing the meaning for these values:

https://people.cs.pitt.edu/~alanjawi/cs449/code/shell/UnixSignals.htm

Unix Signals
SIGHUP 	1 	Exit 	Hangup
SIGINT 	2 	Exit 	Interrupt
SIGQUIT 3 	Core 	Quit
SIGILL 	4 	Core 	Illegal Instruction
SIGTRAP 5 	Core 	Trace/Breakpoint Trap
SIGABRT 6 	Core 	Abort
SIGEMT 	7 	Core 	Emulation Trap
SIGFPE 	8 	Core 	Arithmetic Exception
SIGKILL 9 	Exit 	Killed
SIGBUS 	10 	Core 	Bus Error
SIGSEGV 11 	Core 	Segmentation Fault
SIGSYS 	12 	Core 	Bad System Call
SIGPIPE 13 	Exit 	Broken Pipe
SIGALRM 14 	Exit 	Alarm Clock
SIGTERM 15 	Exit 	Terminated
SIGUSR1 16 	Exit 	User Signal 1
SIGUSR2 17 	Exit 	User Signal 2
SIGCHLD 18 	Ignore 	Child Status
SIGPWR 	19 	Ignore 	Power Fail/Restart
SIGWINCH 20 	Ignore 	Window Size Change
SIGURG 	21 	Ignore 	Urgent Socket Condition
SIGPOLL 22 	Ignore 	Socket I/O Possible
SIGSTOP 23 	Stop 	Stopped (signal)
SIGTSTP 24 	Stop 	Stopped (user)
SIGCONT 25 	Ignore 	Continued
SIGTTIN 26 	Stop 	Stopped (tty input)
SIGTTOU 27 	Stop 	Stopped (tty output)
SIGVTALRM 28 	Exit 	Virtual Timer Expired
SIGPROF 29 	Exit 	Profiling Timer Expired
SIGXCPU 30 	Core 	CPU time limit exceeded
SIGXFSZ 31 	Core 	File size limit exceeded
SIGWAITING 32 	Ignore 	All LWPs blocked
SIGLWP 	33 	Ignore 	Virtual Interprocessor Interrupt for Threads Library
SIGAIO 	34 	Ignore 	Asynch

5 is indeed trap I know that much ! ;)

Bye,
  Skybuck.