[PATCH] x86-64: Treat PC32 relocation with branch as PLT32
Florian Weimer
fweimer@redhat.com
Tue Feb 6 14:55:00 GMT 2018
On 02/06/2018 02:35 PM, H.J. Lu wrote:
> +/* Is the instruction before OFFSET in CONTENTS a 32bit relative
> + branch? */
> +
> +static bfd_boolean
> +is_32bit_relative_branch (bfd_byte *contents, bfd_vma offset)
> +{
> + /* Opcode Instruction
> + 0xe8 call
> + 0xe9 jump
> + 0x0f 0x8x conditional jump */
> + return ((offset > 0
> + && (contents [offset - 1] == 0xe8
> + || contents [offset - 1] == 0xe9))
> + || (offset > 1
> + && contents [offset - 2] == 0x0f
> + && (contents [offset - 1] & 0xf0) == 0x80));
> +}
How is this safe, considering that R_X86_64_PC32 is also used for jump
tables and the like?
Thanks,
Florian
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