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Piotr Jaroszyński: Usermode debugging under Linux

Project Plan

Summary

Allow gPXE to run as a usermode application under Linux on both i386 and x86_64. Hence opening new debugging possibilities and shortening the development cycle considerably.

Implementation details

How usermode under Linux is done

Tasks

Already done

  • Add a linux PLATFORM
    • Link against hacked stdlib
    • Add linker scripts for i386 and x86_64 with tables support
  • Add the necessary subsystems for a tap network driver
    • CONSOLE_LINUX
    • TIMER_LINUX
    • UACCESS_LINUX
    • UMALLOC_LINUX
    • NAP_LINUX
    • SMBIOS_LINUX (empty)
  • Add a tap network driver
  • Add command-line arguments allowing configuration of the tap driver

Current

  • Drop the stdlib dep
    • Implement syscall() and linux_* on top of it where possible
    • Implement linux_realloc
    • Implement _start
    • Make it not too hard to switch to linking to stdlib for debugging purposes

Planned for near future

Planned for later

  • Research how to map gPXE's driver API to hardware via kernel

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