[Bug ld/16548] Ld does not handle arbitrary .plt/.got displacements

[y.gribov at samsung dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=16548

--- Comment #1 from Yury Gribov <y.gribov at samsung dot com> ---
Created attachment 7401
  --> https://sourceware.org/bugzilla/attachment.cgi?id=7401&action=edit
Proposed patch

I suggest to add an option --long-plt to allow generation of 4-word wide
.plt entries capable of handling arbitrary .plt/.got displacements:

0000825c <.plt>:
...
8270: e28fc200 add ip, pc, #0, 4
8274: e28cc600 add ip, ip, #0, 12
8278: e28cca08 add ip, ip, #8, 20 ; 0x8000
827c: e5bcf3f4 ldr pc, [ip, #1012]! ; 0x3f4
8280: e28fc200 add ip, pc, #0, 4
8284: e28cc600 add ip, ip, #0, 12
8288: e28cca08 add ip, ip, #8, 20 ; 0x8000
828c: e5bcf3e8 ldr pc, [ip, #1000]! ; 0x3e8

Users will than be able to avoid afore-mentioned link error by compiling
with -Wl,--long-plt.

I'm attaching a draft patch to illustrate my proposal.

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