• Lynn Boger's avatar
    cmd/link: split large elf text sections on ppc64x · b4efd09d
    Lynn Boger authored
    Some applications built with Go on ppc64x with external linking
    can fail to link with relocation truncation errors if the elf
    text section that is generated is larger than 2^26 bytes and that
    section contains a call instruction (bl) which calls a function
    beyond the limit addressable by the 24 bit field in the
    instruction.
    
    This solution consists of generating multiple text sections where
    each is small enough to allow the GNU linker to resolve the calls
    by generating long branch code where needed.  Other changes were added
    to handle differences in processing when multiple text sections exist.
    
    Some adjustments were required to the computation of a method's address
    when using the method offset table when there are multiple text sections.
    
    The number of possible section headers was increased to allow for up
    to 128 text sections.  A test case was also added.
    
    Fixes #15823.
    
    Change-Id: If8117b0e0afb058cbc072258425a35aef2363c92
    Reviewed-on: https://go-review.googlesource.com/27790
    Run-TryBot: Ian Lance Taylor <iant@golang.org>
    TryBot-Result: Gobot Gobot <gobot@golang.org>
    Reviewed-by: 's avatarIan Lance Taylor <iant@golang.org>
    b4efd09d
linkbig_test.go 2.58 KB