On Wed, 2008-01-30 at 08:38 -0800, walt wrote:
> Robert Millan wrote:
> ...
> > What happens if you define the missing symbols somewhere? Any part of
> > the GRUB kernel will do (e.g. kern/main.c). Just add them as empty
> > functions:
> >
> > void
> > __sysctl (void)
> > {
> > }
> >
> > void
> > mprotect (void)
> > {
> > }
> >
> > and check if that works.
> Anyway, your suggestion helps, but not quite enough. The c code now
> compiles and links okay into *.mod files, but now __enable_execute_stack
> shows up in several und-*.lst files...
I've been hacking the various flags for elf.mod just to get *any* module
to link properly but no luck. Here is the actual text printed by gcc
as it links elf.mod:
gcc -m32 -nostdlib -lgcc -L/usr/lib -Wl,-r,-d,-lgcc,-L/usr/lib -o
elf.mod pre-elf.o mod-elf.o
You can tell I'm desperate because I'm putting -lgcc everywhere I can
think of. Here is the symbol in libgcc.a:
_enable_execute_stack.o:
00000000 T __enable_execute_stack
And here is the symbol table from the resulting elf.mod:
# nm elf.mod
U __enable_execute_stack <======= WTF?
0000038a T grub_elf32_load
000003fe T grub_elf32_size
Okay, I found one *more* place to put libgcc:
gcc -m32 -nostdlib -lgcc -L/usr/lib -Wl,-r,-d,-lgcc,-L/usr/lib -o
elf.mod pre-elf.o mod-elf.o /usr/lib/libgcc.a
Here is the puzzling (to me) result:
# nm elf.mod
00000784 T __enable_execute_stack
U __sysctl
0000038a T grub_elf32_load
000003fe T grub_elf32_size
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