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Debugging an i386 userspace on an amd64 target https://forum.osdev.org/viewtopic.php?f=1&t=33825 |
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Author: | ameame [ Mon Aug 12, 2019 8:13 pm ] |
Post subject: | Debugging an i386 userspace on an amd64 target |
I recently ported my x86 kernel to support x64 and I'm having a problem debugging applications in gdb+qemu. Before I would load the kernel into gdb, pause execution then load the userland application and execute it. Now because of architecture mixing gdb can't change the debug architecture to 32-bit and it can't backtrace or display local variables correctly. Is there at least a better way to debug applications than this? |
Author: | MichaelPetch [ Mon Aug 12, 2019 9:25 pm ] |
Post subject: | Re: Debugging an i386 userspace on an amd64 target |
Are you the fellow who asked the core dump question on Stackoverflow recently? |
Author: | MichaelPetch [ Mon Aug 12, 2019 9:27 pm ] |
Post subject: | Re: Debugging an i386 userspace on an amd64 target |
If you ported your OS to 64-bit then why would it be running 32-bit code? Do you switch tom 32-bit compatibility mode to execute 32-bit userland (ring 3) code? |
Author: | ameame [ Mon Aug 12, 2019 9:29 pm ] |
Post subject: | Re: Debugging an i386 userspace on an amd64 target |
MichaelPetch wrote: Are you the fellow who asked the core dump question on Stackoverflow recently? Nah, never posted to stackoverflow before. MichaelPetch wrote: If you ported your OS to 64-bit then why would it be running 32-bit code? Do you switch tom 32-bit compatibility mode to execute 32-bit userland code? Oops, that was a mistake. I mean't ported my kernel to 64-bit. My processes run in compatibility mode. |
Author: | MichaelPetch [ Mon Aug 12, 2019 9:59 pm ] |
Post subject: | Re: Debugging an i386 userspace on an amd64 target |
Sounds like you are running into this issue that started becoming a problem as of 2.9 of QEMU: https://bugs.launchpad.net/qemu/+bug/1686170 . Any chance you could build 2.8.1 of QEMU and try? |
Author: | ameame [ Mon Aug 12, 2019 10:51 pm ] |
Post subject: | Re: Debugging an i386 userspace on an amd64 target |
MichaelPetch wrote: Sounds like you are running into this issue that started becoming an issue as of 2.9 of QEMU: https://bugs.launchpad.net/qemu/+bug/1686170 . Any chance you could build 2.8.1 of QEMU and try? Thanks, it worked! I did have to do the disconnect trick and patch in some files so it's compatible with my glibc though. |
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