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

[y.gribov at samsung dot com]

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

            Bug ID: 16548
           Summary: Ld does not handle arbitrary .plt/.got displacements
           Product: binutils
           Version: 2.25 (HEAD)
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: y.gribov at samsung dot com

Currently BFD linker generates 3-word wide .plt entries for ARM targets:

0000825c <.plt>:
...
8270: e28fc600 add ip, pc, #0, 12
8274: e28cca08 add ip, ip, #8, 20 ; 0x8000
8278: e5bcf3e8 ldr pc, [ip, #1000]! ; 0x3e8
827c: e28fc600 add ip, pc, #0, 12
8280: e28cca08 add ip, ip, #8, 20 ; 0x8000
8284: e5bcf3e0 ldr pc, [ip, #992]! ; 0x3e0

These entries are only able to initialize first 28 bits of .plt/.got
displacement. If .text and .rodata are bigger than 2 ^ 28 bytes (i.e. 256M)
this may cause linker errors due to assert in elf32_arm_populate_plt_entry (in
bfd/elf32-arm.c):

BFD_ASSERT ((got_displacement & 0xf0000000) == 0);

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