[Bug dynamic-link/27924] ld.so: Support DT_RELR relative relocation format

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27924

--- Comment #16 from H.J. Lu <hjl.tools at gmail dot com> ---
There is another problem.  A static PIE with DT_RELR can have
0 DT_RELA entry when all relative relocations are in DT_RELR:

[hjl@gnu-tgl-3 DT_RELR-3]$ readelf -d x-static

Dynamic section at offset 0xbbd88 contains 24 entries:
  Tag        Type                         Name/Value
 0x000000000000000c (INIT)               0x1000
 0x000000000000000d (FINI)               0x8d630
 0x0000000000000019 (INIT_ARRAY)         0xb9750
 0x000000000000001b (INIT_ARRAYSZ)       8 (bytes)
 0x000000000000001a (FINI_ARRAY)         0xb9758
 0x000000000000001c (FINI_ARRAYSZ)       8 (bytes)
 0x000000006ffffef5 (GNU_HASH)           0x368
 0x0000000000000005 (STRTAB)             0x3a0
 0x0000000000000006 (SYMTAB)             0x388
 0x000000000000000a (STRSZ)              1 (bytes)
 0x000000000000000b (SYMENT)             24 (bytes)
 0x0000000000000015 (DEBUG)              0x0
 0x0000000000000003 (PLTGOT)             0xbd000
 0x0000000000000002 (PLTRELSZ)           576 (bytes)
 0x0000000000000014 (PLTREL)             RELA
 0x0000000000000017 (JMPREL)             0x3a8
 0x0000000000000007 (RELA)               0x0
 0x0000000000000008 (RELASZ)             0 (bytes)
 0x0000000000000009 (RELAENT)            24 (bytes)
 0x000000006ffffffb (FLAGS_1)            Flags: PIE
 0x0000000000000024 (RELR)               0x5e8
 0x0000000000000023 (RELRSZ)             312 (bytes)
 0x0000000000000025 (RELRENT)            8 (bytes)
 0x0000000000000000 (NULL)               0x0
[hjl@gnu-tgl-3 DT_RELR-3]$ 

ld.so doesn't work with 0 DT_RELA entry.

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