[Bug gas/22791] PLT32 should be used for 32-bit PC-relative branches

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=22791

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|                            |x86-64
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2018-02-07
          Component|gold                        |gas
            Version|unspecified                 |2.31 (HEAD)
           Assignee|ccoutant at gmail dot com          |unassigned at 
sourceware dot org
            Summary|Don't error when a -pie     |PLT32 should be used for
                   |executable uses a shared    |32-bit PC-relative branches
                   |function without PIC/PIE    |
                   |relocation                  |
     Ever confirmed|0                           |1

--- Comment #15 from H.J. Lu <hjl.tools at gmail dot com> ---
On i386, there are 2 types of PLTs, PIC and non-PIC.  PIE and shared objects 
must use PIC PLT.  To use PIC PLT, you need to load _GLOBAL_OFFSET_TABLE_ 
into EBX first.  There is no need for that on x86-64 since x86-64 uses 
PC-relative PLT. 

For 32-bit PC-relative branches, we can generate PLT32 relocation, instead of 
PC32 relocation, which can also be used as a marker for 32-bit PC-relative 
branches.   Linker can always reduce PLT32 relocation to PC32 if function is 
defined locally.   Local functions should use PC32 relocation.

-- 
You are receiving this mail because:
You are on the CC list for the bug.