[Bug ld/29954] bpf sim tests fail due to linker triggering LOAD segment with RWX permissions test by default

[jose.marchesi at oracle dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=29954

--- Comment #2 from Jose E. Marchesi <jose.marchesi at oracle dot com> ---
Hi Nick.

I tried that locally and definitely works.  But I don't think it is the right
fix in this case.

When linked without -Ttext=0x0, the following segments are created in the
resulting executable:

 Elf file type is EXEC (Executable file)                                        
 Entry point 0x400000                                                           
 There are 2 program headers, starting at offset 64                             

 Program Headers:                                                               
   Type           Offset             VirtAddr           PhysAddr                
                  FileSiz            MemSiz              Flags  Align           
   LOAD           0x0000000000100000 0x0000000000400000 0x0000000000400000      
                  0x0000000000000648 0x0000000000000648  R E    0x100000        
   LOAD           0x0000000000101648 0x0000000000801648 0x0000000000801648      
                  0x0000000000000006 0x0000000000000006  RW     0x100000        

  Section to Segment mapping:                                                   
   Segment Sections...                                                          
    00     .text                                                                
    01     .data                                                                

Which is perfectly fine.  But then it is the simulator that fails with:

  spawn ./bpf/run --memory-size=4Mb
/home/jemarch/gnu/src/binutils-gdb/build-bpf/sim/alu.s.x
  core: 8 byte read to unmapped address 0x400000 at 0x400000

Meaning the simulator is somehow not loading the segments at the right VMA.

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