Module Name: src
Committed By: uebayasi
Date: Thu Nov 13 15:25:48 UTC 2014
Modified Files:
src/usr.bin/config: TODO
Log Message:
Revise a plan about link-set.
(I was ignorant 2 weeks ago.)
To generate a diff of this commit:
cvs rdiff -u -r1.11 -r1.12 src/usr.bin/config/TODO
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/usr.bin/config/TODO
diff -u src/usr.bin/config/TODO:1.11 src/usr.bin/config/TODO:1.12
--- src/usr.bin/config/TODO:1.11 Sat Nov 8 05:57:41 2014
+++ src/usr.bin/config/TODO Thu Nov 13 15:25:48 2014
@@ -158,17 +158,21 @@ o Support kernel constructor/destructor
sequence of various subsystem initializations in init_main.c:main() will be
replaced by an array of .kctors invocations, and #ifdef's there will be gone.
-o Replace linkset.
+o Hide link-set in the final kernel.
- Don't allow kernel subsystems create random ELF sections (with potentially
- long names) in the final kernel. To collect some data in statically linked
- modules, creating intermediate sections (e.g. .data.linkset.sysctl) and
- exporting the start/end symbols (e.g. _data_linkset_sysctl_{start,end})
- using linker script should be fine.
-
- Dynamically loaded modules have to register those entries via constructors
- (functions). This means that dynamically loaded modules are flexible but
- come with overhead.
+ Link-set is used to collect references (pointers) at link time. It relys on
+ the ld(1) behavior that it automatically generates `__start_X' and `__stop_X'
+ symbols for the section `X' to reduce coding.
+
+ Don't allow kernel subsystems create random ELF sections.
+
+ Pre-define all the available link-set names and pre-generate a linker script
+ to merge them into .rodata.
+
+ (For modular(9) modules, `link_set_modules' is looked up by kernel loader.
+ Provide only it.)
+
+ Provide a way for 3rd party modules to declare extra link-set.
o Shared kernel objects.
