I am currently going through Linux Device Drivers book and found the functions for reading from I/O memory: To read from I/O memory, use one of the following: unsigned int ioread8(void *addr); unsigned int ioread16(void *addr); unsigned int ioread32(void *addr); If you must read or write a series of values to…
Tag: qemu
qom-type is missing when running qemu/kvm
I’m trying to set up QEMU/KVM and faced the following issue: So I tried to specify this as a format as Searching for qom-type at QEMU manual page didn’t give any results. How to specify the correct qom-type for that case? Answer “-object format=raw” says “create a QOM object, who…
Why does the Qemu run differ from the native run?
What did i do? I ran qemu-x86_64 -singlestep -d nochain,cpu ./dummy to dump all the registers of a dummy program after each instruction and used grep to save all the RIP values into a text file (qemu_rip_dump.txt). I then singlestepped the dummy program with ptrace and dumped the RIP values after each instruc…
My newly compiled kernel loses Networking in qemu
I compiled a kernel from source : make defconfig make kvmconfig make -j 4 After this , i use the resulting bzImage for my qemu command: qemu-system-x86_64 -hda debian.img -kernel bzImage -append “root=/dev/sda console=ttyS0” -nographic -m 4096 -smp 2 –enable-kvm -net user,hostfwd=tcp::10021-…
How to emulate ARM unaligned memory access exceptions?
I’m writing a cross-platform application which works on x86 machines, but crashes with “Bus error” on the actual ARM hardware (Raspberypi 2) … … but runs without any problems in Qemu. I run this command to enable SIGBUS signal and notification in the kernel running under Qemu, bu…
Kernel debugging – gdb step jumps out of function
I’m trying to do understand the kernel network stack for a security research for my university. That’s why I try to debug the linux kernel. So far I’m doing quite well but I ran in a problem when trying to use qemu and gdb for debugging. The problem is as follows: I boot my linux system: mak…
How do I implement basic I/O functionality as in x86 when writing an OS on ARM? [closed]
Closed. This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 5 years ago. Improve this question I’m trying to write a simple operating system from scratch as a way …
DNS server not working in QEMU usermode networking
I am trying to get QEMU 2.8.0 on Windows host to work with my Linux guest with vanilla 2.6.11.12 kernel but it is responding with unknown host. I am using user mode networking (SLIRP). Here’s my qemu network status: And my ifconfig: And my routing table: I am able to ping the router but not the QEMU DNS…
Error “undefined reference to `cprintf”” during executing make command in qemu in linux kernel
(1) This is the main function (runproctest.c): (2) defs.h: (3) console.c (4) main.c (5) Here is my Makefile: and when I enter make qemu there is a problem: I don’t know why this happens.. Answer in the makefile, this line: should be: There may be other ld commands in the make file with similar problems.…
How to run Linux on a QEMU ARM Versatile machine?
I’m trying to run linux on qemu, especially the versatile version. I downloaded qemu and linux from github. (qemu : https://github.com/qemu/qemu.git, linux : https://github.com/torvalds/linux.git) I think these two repositorys are the main project of them. Anyway, I compiled linux with 2 steps. make ARC…