On Sun, May 26, 2024 at 11:51 PM Max Filippov <jcmvb...@gmail.com> wrote:
>
> diff --git a/libbacktrace/internal.h b/libbacktrace/internal.h
> index 4fa0af8cb6c9..456911166026 100644
> --- a/libbacktrace/internal.h
> +++ b/libbacktrace/internal.h
> @@ -323,10 +323,22 @@ struct dwarf_sections
>
> struct dwarf_data;
>
> +#if defined (HAVE_DL_ITERATE_PHDR) && defined (__FDPIC__)
> +typedef struct elf32_fdpic_loadaddr base_address_type;
> +#define __RELOC_UINTPTR(ptr, base) ((uintptr_t)__RELOC_POINTER (ptr, base))
> +#define no_base_address ((struct elf32_fdpic_loadaddr){0})
> +#else
> +typedef uintptr_t base_address_type;
> +#define __RELOC_POINTER(ptr, base) ((ptr) + (base))
> +#define __RELOC_UINTPTR(ptr, base) ((uintptr_t)__RELOC_POINTER (ptr, base))
> +#define no_base_address ((uintptr_t)0)
> +#endif
> +
> +
When I look at the uClibc sources, I don't understand how this works.
This sets no_base_address to have a zero map field. But
__RELOC_POINTER will crash when given a zero map field. At least that
is what it looks like in
uClibc/libc/sysdeps/linux/bfin/bits/elf-fdpic.h. What target and what
library are you using? Thanks.
Ian
