[Qemu-devel] [Bug 883136] Re: qemu on ARM hosts aborts on startup because makecontext() always fails

[Dr. David Alan Gilbert]

OK, here is a eglibc patch that adds the context routines; seems to pass
Stefan's magic coroutine test, pass all the context specific tests in
eglibc and boots a debian image on qemu.  (Not run a full eglibc test
run yet).

Dave

** Attachment added: "eglibc patch for ARM context routines"
   
https://bugs.launchpad.net/qemu-linaro/+bug/883136/+attachment/2644972/+files/context-diff-v0.3

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https://bugs.launchpad.net/bugs/883136

Title:
  qemu on ARM hosts aborts on startup because makecontext() always fails

Status in QEMU:
  New
Status in Linaro QEMU:
  New

Bug description:
  qemu has recently grown a coroutines implementation. There are two
  versions, one using the makecontext/setcontext/swapcontext functions
  from ucontext.h, and one falling back to implementing coroutines as
  separate glib threads. configure chooses the former if the platform
  has a makecontext().

  Unfortunately ARM eglibc provides a makecontext() which always fails
  ENOSYS, which means the configure check passes but when qemu starts it
  abort()s.

  The best fix for this is probably going to involve making the
  coroutine implementation runtime-selectable.

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