I wrote that years ago for the LK project. Basically it was to call C++ constructors, which are put into a special section. On a normal OS, this is handled by the loader, but in this case there is no loader so it called explicitly at the start of the kernel. If there's no C++ in the system it wont matter at all.
Travis On Tue, Sep 27, 2011 at 11:11 PM, ivan <ivan.9ki...@gmail.com> wrote: > William, > Thanks for the reply. > Basically, I understand it's useful for the constructor. > I'm confused about why we should call it explicitly in the code, > because in the other codes, we needn't do this, maybe the gcc will > handle it. > > On Sep 28, 10:21 am, "William W.-Y. Liang" <wyli...@mail.ntut.edu.tw> > wrote: >> Hi, Ivan, >> >> __ctor_list and __ctor_end are defined by the linker script, for a special >> section for 'constructors' defined in the kernel. >> >> William Lianghttp://www.ntut.edu.tw/~wyliang >> >> 2011/9/27 ivan <ivan.9ki...@gmail.com> >> >> >> >> >> >> >> >> > Hi, guys >> >> > When I read the code of lk/kernel/main.c, I feel confused about using >> > "call_constructors()" during the >> > initialization, as below. Could anyone interpret it to me? Your kind >> > help will be appreciated very much. >> >> > ****************************** >> > void kmain(void) >> > { >> > // get us into some sort of thread context >> > thread_init_early(); >> >> > ..... >> >> > call_constructors(); >> > ...... >> > } >> >> > static void call_constructors(void) >> > { >> > void **ctor; >> > ctor = &__ctor_list; >> > while(ctor != &__ctor_end) { >> > void (*func)(void); >> >> > func = (void (*)())*ctor; >> >> > func(); >> > ctor++; >> > } >> > } >> >> > ****************************** >> >> > -- >> > unsubscribe: android-kernel+unsubscr...@googlegroups.com >> > website:http://groups.google.com/group/android-kernel > > -- > unsubscribe: android-kernel+unsubscr...@googlegroups.com > website: http://groups.google.com/group/android-kernel -- unsubscribe: android-kernel+unsubscr...@googlegroups.com website: http://groups.google.com/group/android-kernel
