This is a REPL for assembly language.
Install the gem:
$ gem install asmrepl
Then start the repl like this:
$ asmrepl
If you're on macOS, you'll need to start the repl with sudo.
When the REPL starts, it will display all register values and flags:
================== CPU STATE ===================
rax 000000000000000000 r8 0x0000600001782be0
rbx 000000000000000000 r9 0x00007fbf9b0068c0
rcx 0x0000000109dae951 r10 000000000000000000
rdx 0x000000000000000c r11 0x000000010999c000
rdi 0x00007ff7b6b2bbf0 r12 000000000000000000
rsi 0x00000001096315fd r13 0x00007ff7b6b2bdc0
rbp 0x00007ff7b6b2bc40 r14 000000000000000000
rsp 0x00007ff7b6b2bc38 r15 000000000000000000
rip 0x000000010999c001
rflags 0x0000000000000246
cs 0x000000000000002b
fs 000000000000000000
gs 000000000000000000
FLAGS: ["PF", "ZF", "IF"]
>>
Then you can issue commands and inspect register values. Let's write to the
rax register and inspect its value:
>> mov rax, 5
>> rax
0x0000000000000005
>>
Now let's write to the rbx register and add the two values:
>> mov rbx, 3
>> add rax, rbx
>> rax
0x0000000000000008
>> rbx
0x0000000000000003
>>
Finally, lets check all values in the CPU:
>> cpu
================== CPU STATE ===================
rax 0x0000000000000008 r8 0x0000600001d848a0
rbx 0x0000000000000003 r9 0x00007fced316f850
rcx 0x00000001017da951 r10 000000000000000000
rdx 0x000000000000000c r11 0x00000001013cc000
rdi 0x00007ff7bf0fdbf0 r12 000000000000000000
rsi 0x000000010105f5fd r13 0x00007ff7bf0fddc0
rbp 0x00007ff7bf0fdc40 r14 000000000000000000
rsp 0x00007ff7bf0fdc38 r15 000000000000000000
rip 0x00000001013cc029
rflags 0x0000000000000202
cs 0x000000000000002b
fs 000000000000000000
gs 000000000000000000
FLAGS: ["IF"]
>>