On Tue, 2024-12-03 at 13:23 +0900, Hajime Tazaki wrote: > This commit introduces an entry point of syscall interface for !MMU > mode. It uses an entry function, __kernel_vsyscall, a kernel-wide global > symbol accessible from any locations. > > Although it isn't in the scope of this commit, it can be also exposed > via vdso image which is directly accessible from userspace. A standard > library (i.e., libc) can utilize this entry point to implement syscall > wrapper; we can also use this by hooking syscall for unmodified userspace > applications/libraries, which will be implemented in the subsequent > commit. > > This only supports 64-bit mode of x86 architecture. > > Signed-off-by: Hajime Tazaki <thehaj...@gmail.com> > Signed-off-by: Ricardo Koller <ricar...@google.com> > --- > arch/x86/um/do_syscall_64.c | 37 +++++++++++ > arch/x86/um/entry_64.S | 87 +++++++++++++++++++++++++ >
As I said before, I think it needs to be something obviously nommu. Maybe in a new directory, or maybe nommu_syscall_64.c or something like that. Also needs comment style fixes and I'm not sure about all the pr_debug(), but I guess they don't matter unless someone defines it? johannes
