Add insn cmd to interactive debug mode

[abejgonzalez]

This PR adds a new interactive debug mode cmd of insn with the same API as the pc command to print out the instruction associated with the PC of a specific hart. This command can be used with the until* commands to run a binary "until" the "insn" value is a specific value.

[aswaterman]

This looks like a reasonable addition to me, but do you think it makes sense to enhance it by printing out the disassembled instruction after printing out its opcode? I guess it doesn't matter much since the main purpose is the until aspect, not the printing aspect, so I'll leave it up to you.

[abejgonzalez]

This looks like a reasonable addition to me, but do you think it makes sense to enhance it by printing out the disassembled instruction after printing out its opcode? I guess it doesn't matter much since the main purpose is the until aspect, not the printing aspect, so I'll leave it up to you.

It would be nice. I have a commit ready to add it but I'm unsure of the format for output. Right now it looks like the following:

(spike) insn 0
0x0202859300000297 auipc   t0, 0x0

If there is no preference on the format (i.e. <HEX> <DISASM>) then I can commit it.

[abejgonzalez]

This looks like a reasonable addition to me, but do you think it makes sense to enhance it by printing out the disassembled instruction after printing out its opcode? I guess it doesn't matter much since the main purpose is the until aspect, not the printing aspect, so I'll leave it up to you.

It would be nice. I have a commit ready to add it but I'm unsure of the format for output. Right now it looks like the following:

(spike) insn 0
0x0202859300000297 auipc   t0, 0x0

If there is no preference on the format (i.e. <HEX> <DISASM>) then I can commit it.

Done.

[aswaterman]

Yeah, that's fine.

Can you squash these commits into one?

[aswaterman]

Also note that CI is broken until #1710 is merged.

[abejgonzalez]

Yeah, that's fine.

Can you squash these commits into one?

Will do.

[aswaterman]

LGTM.