Re: [PATCH] Do arm_abi detection for ELFOSABI_GNU binaries

[Kyle Huey <me@kylehuey.com>]

On Fri, Apr 17, 2015 at 1:41 AM, Yao Qi <qiyaoltc@gmail.com> wrote:
> Kyle Huey <me@kylehuey.com> writes:
>
> Hi Kyle,
>
>> On ARM systems, gdb must determine which style of breakpoint to use
>> (see the comments at the beginning of gdb/arm-linux-tdep.c).  In
>> arm_gdbarch_init we only attempt to extract the eabi version from the
>> ELF binary if it is a ELFOSABI_NONE binary.  If the binary is
>> ELFOSABI_GNU instead, we end up defaulting to the old style OABI
>> syscall breakpoint instruction.  On a Linux kernel built without
>> CONFIG_OABI_COMPAT, this triggers a SIGILL in ld when attempting to
>> execute any ELFOSABI_GNU program.  (e.g.
>> https://github.com/raspberrypi/linux/issues/766)
>
> Thanks for submitting the patch... Looks GDB doesn't detect the correct
> abi in your case, but you can set arm abi explicitly via "set arm abi AAPCS".
> Hope this can unblock you.  In the mean time, I'll think about your patch.
>
> --
> Yao (齐尧)

Hello Yao,

Thank you for the tip.  Have you had a chance to look at the patch?

- Kyle