[PATCH 0/3 v3] [AArch64] Support tagged pointer

Pedro Alves palves@redhat.com
Fri Dec 8 12:24:00 GMT 2017


On 12/08/2017 10:04 AM, Yao Qi wrote:
> ARMv8 supports tagged address, that is, the top one byte in address
> is ignored.  It is always enabled on aarch64-linux.  See
> https://www.kernel.org/doc/Documentation/arm64/tagged-pointers.txt
> 
> Some parts of GDB related to address are updated in this patch series,
> 
>  - Memory access, like command 'x',
>  - Setting hw breakpoint on some address,
>  - Setting watchpoint on some address,
> 
> Address tag is treated as non-significant bits of address, so this patch
> series add a new gdbarch significant_addr_bit, and use it in gdbarch to
> get rid of non-significant bits.  This was the suggestion in the v2 review.
> (https://sourceware.org/ml/gdb-patches/2017-10/msg00792.html)

Thanks much for the update.  I like this version a lot better.

> 
> When I test this patch series, and I find a regression in linespec.  I
> posted the fix https://sourceware.org/ml/gdb-patches/2017-12/msg00158.html
> Without this fix, this series causes a regression.

Thanks again for that fix.

Pedro Alves



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