[Minios-devel] [UNIKRAFT PATCH v3 0/7] Provide library constructors

[Simon Kuenzer <simon.kuenzer@xxxxxxxxx>]

This patch series adds the arrays called preinit_array and
init_array to the Unikraft binaries. These arrays contain
function pointers to constructors and they are populated
during link time.
Libraries can register a function to it by marking its init
function(s) with a new attribute macro called __constructor
(provided with `include/uk/essentials.h`). The bootstrapping
library `libukboot` is executing each of these functions during
boot so that libraries can execute necessary early-initialization
routines (before scheduling and before memory allocators
are initialized).

Changes to v1/v2:

- Instead of introducing ukplat_ctortab, use the common preinit_array 
  and init_array sections. Calling constructors with this method, we
  keep compatibility with existing libraries and language runtimes
  (e.g., C++).
- The __used and __section macros in `include/uk/essentials.h` are
  not needed anymore but are kept in this updated patch series since
  they are anyway useful.

Simon Kuenzer (7):
  include/essentials: Provide __used, __section macros
  plat/kvm: Align linker script with Xen platform ones
  plat/kvm: Add preinit_array and init_array sections (x86)
  plat/xen: Add preinit_array and init_array sections (x86, ARM)
  include/essentials: Provide __constructor macro
  include: Add ctors.h header for iterating over init arrays
  lib/ukboot: Call constructors from initarrays

 include/uk/essentials.h |  19 +++++++++
 include/uk/plat/ctors.h |  75 ++++++++++++++++++++++++++++++++
 lib/ukboot/boot.c       |  32 ++++++++++++--
 plat/kvm/memory.c       |  44 ++++++++++++++-----
 plat/kvm/x86/entry64.S  |   2 +-
 plat/kvm/x86/link64.ld  | 111 +++++++++++++++++++++++++-----------------------
 plat/kvm/x86/setup.c    |   2 +-
 plat/xen/arm/link32.ld  |  43 +++++++++----------
 plat/xen/memory.c       |  10 ++---
 plat/xen/x86/link64.ld  |  17 ++++++++
 10 files changed, 257 insertions(+), 98 deletions(-)
 create mode 100644 include/uk/plat/ctors.h

-- 
2.7.4


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