This commit fixes
https://github.com/zephyrproject-rtos/zephyr/issues/5008.
It does so by splitting up gen_syscalls.py into two scripts with a
json metadata file to communicate syscall metadata between them. The
parsing script parses header files from include/ and writes syscall
metadata to a file if the contents changed. The generation script
reads from the json file and generates syscall code.
The build system DAG now looks like this:
always_rebuild -> json -> syscalls -> offset.o
The script for generating json will do so only if the content changes,
this ensures that the entire DAG does not always do a full rebuild.
Signed-off-by: Sebastian Bøe <sebastian.boe@nordicsemi.no>
This is subject to the constraint that such system calls must have a
return value which is "u64_t" or "s64_t".
So far all the relevant kernel calls just have zero or one arguments,
we can later add more _syscall_ret64_invokeN() APIs as needed.
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This used to exist because in earlier versions of the system call
interfaces, an "extern" declaration of the system call implementation
function would precede the real inline version of the implementation.
The compiler would not like this and would throw "static declaration
of ‘foo’ follows non-static declaration". So alternate macros were
needed which declare the implementation function as 'static inline'
instead of extern.
However, currently the inline version of these system call
implementations appear first, the K_SYSCALL_DECLARE() macros appear in
the header generated by gen_syscalls.py, which is always included at the
end of the header file. The compiler does not complain if a
static inline function is succeeded by an extern prototype of the
same function. This lets us simplify the generated system call
macros and just use __syscall everywhere.
The disassembly of this was checked on x86 to ensure that for
kernel-only or CONFIG_USERSPACE=n scenarios, everything is still being
inlined as expected.
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
In Python, if open() doesn't specify "encoding" parameter,
locale.getpreferredencoding(False) will be used as the default,
as explained in
https://docs.python.org/3/library/functions.html#open ,
which may differ from system to system. So, explicitly specify
"encoding" param in open() call.
Also, fix a typo in a comment.
Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
To define a system call, it's now sufficient to simply tag the inline
prototype with "__syscall" or "__syscall_inline" and include a special
generated header at the end of the header file.
The system call dispatch table and enumeration of system call IDs is now
automatically generated.
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
Anas Nashif