Machine/reg.h missing

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#1

Trying to programme a process api wrapper library and was referencing How Debuggers Work: Getting and Setting x86 Registers, Part 1 | Moritz Systems to understand how to copy the register state but the compiler complains of a missing <machine/reg.h> file, anyone know how to fix that?

#2

Hi @zxuiji,

While I have absolutely zero (0) knowledge of this, whatever this refers to, a quick Google search has lead me to this page, which states:

Try including sys/user.h and sys/reg.h ORIG_EAX is defined in reg.h

An so, after searching on my PC, I could see it’s there:

$ locate reg.h
/usr/include/asm/debugreg.h
/usr/include/dmraid/dmreg.h
/usr/include/linux/fdreg.h
/usr/include/linux/hdreg.h
/usr/include/linux/serial_reg.h
/usr/include/nss/portreg.h
/usr/include/sys/debugreg.h
/usr/include/sys/reg.h
/usr/include/wine/windows/dmoreg.h
/usr/include/wine/windows/mmreg.h
/usr/include/wine/windows/winreg.h
/usr/lib/gcc/x86_64-pc-linux-gnu/10.
[...]

So, according to my (very) limited knowledge, it looks like you have to include /usr/include/sys/reg.h somewhere in your project.

Of course, that’s just according to me, and yours might bee different.

Hope this helps!

#3

Already tried that but it didn’t have the necessary structs defined, namely:

struct reg;
struct fpreg;
struct dbreg;

and the ptrace() docs specifically state machine/reg.h as the expected header for those structures

#4

Yeah, dude. As I mentioned in my reply, I have absolutely zero (0) knowledge of this.

So you could have told me to buzz of in greek for all the sense that made. :wink:

Maybe it helps someone else to help, but that someone is definitely not me.

#5

I appreciate you tried anyways, was more hoping someone who did know what package I would need to install to resolve this would pop in and reply

#6

And it’s still (relatively) early and anything can happen, so let’s hope someone brighter than me ops in to help.

#7

You did realize the referenced article and examples therein are using *bsd (netbsd, freebsd for example) and your Manjaro machine is linux (and therefore not a *bsd)?

#8

I figured being ptrace() they would just use the same library though? Currently seeing what I can do with the sys/reg.h header (not having any luck getting the registers from self - getpid() to be clear - just yet)

#9