This commit adds vDSO support: creates vDSO memory region which contains
necessary symbols __vdso_{gettimeofday, clock_getime, time, getcpu} with
wrappers to call function pointers with actual LibOS implementation.
On startup, function pointers are setup to point to actual functions.
With this commit, the Glibc modification to not use vDSO can be removed.
The "cc-option" must be used to conditionally add compiler options only
in those environments which support these options (e.g., older verions
of gcc may not support some options, thus they must be declared via
"cc-option").
Currently cp to Runtime dir is used. Sometimes it is confusing when
binaries are re-built under Pal or LibOS. Symlink is better, so use
it instead.
- It's easy to understand where a file under Runtime dir comes from
- It's easy to understand in which directory to run `make`
- If cp is used, it's quite easy to test old binary under Runtime.
This patch create ln_sf rule and use it instead of cp and applies to
other recipe with cp.
In this context, creating symlink of glibc libraries is mess. This
patch also cleans it up to use Makefile instead of embedding the logic
into python script.
Signed-off-by: Isaku Yamahata <isaku.yamahata@gmail.com>
Auto generate offset constants for assembly. replace magic number with
symbolic constants in LibOS/shim/src/syscallas.S.
This patch also introduces Makefile.rules to accommodate common make rules
so that V=1 (like Linux style make) is accepted.
Signed-off-by: Isaku Yamahata <isaku.yamahata@gmail.com>
Isaku Yamahata