On Wed, 9 Mar 2022 16:49:57 +0100
Daniel Kiper <dki...@net-space.pl> wrote:
> On Wed, Mar 02, 2022 at 06:25:12PM -0600, Glenn Washburn wrote:
> > Add linker flags when linking kernel.exec to have malloc and free point to
> > grub_malloc and grub_free respectively. Some gdb functionality depends on
> > gdb locating the symbols "malloc" and "free", such as dynamically creating
> > strings for arguments to injected function calls. A trivial example would
> > the gdb command 'p strlen("astring")'.
> >
> > Signed-off-by: Glenn Washburn <developm...@efficientek.com>
> > ---
> > This should have been included in the gdb patch series I recently sent,
> > although its not required by nor requires any of those patches.
> >
> > Glenn
> >
> > ---
> > conf/Makefile.common | 1 +
> > 1 file changed, 1 insertion(+)
> >
> > diff --git a/conf/Makefile.common b/conf/Makefile.common
> > index f0bb6e160a..069b428c1a 100644
> > --- a/conf/Makefile.common
> > +++ b/conf/Makefile.common
> > @@ -36,6 +36,7 @@ BUILD_CPPFLAGS += $(CPPFLAGS_DEFAULT)
> >
> > CFLAGS_KERNEL = $(CFLAGS_PLATFORM) -ffreestanding
> > LDFLAGS_KERNEL = $(LDFLAGS_PLATFORM) -nostdlib $(TARGET_LDFLAGS_OLDMAGIC)
> > +LDFLAGS_KERNEL += -Wl,--defsym=malloc=grub_malloc
> > -Wl,--defsym=free=grub_free
>
> Could not we teach gdb somehow to use grub_malloc()/grub_free() instead
> of malloc()/free()?
Considering the tons of options that GDB has, I was hoping the same
thing. Unfortunately, it appears to be hardcoded[1]. So not without
changing the source.
Glenn
[1]
https://sourceware.org/git/?p=binutils-gdb.git;a=blob;f=gdb/valops.c;hb=HEAD#l169
>
> Daniel
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