[Bug 1853826] Re: ELF loader fails to load shared object on ThunderX2 running RHEL7

[Assad Hashmi]

For info, a similar type of failure has been seen when loading libarmflang.so 
on DynamoRIO:
https://github.com/DynamoRIO/dynamorio/issues/3385
It's to do with the .dynstr section being mapped incorrectly causing a SIGBUS.

** Bug watch added: github.com/DynamoRIO/dynamorio/issues #3385
   https://github.com/DynamoRIO/dynamorio/issues/3385

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https://bugs.launchpad.net/bugs/1853826

Title:
  ELF loader fails to load shared object on ThunderX2 running RHEL7

Status in QEMU:
  New

Bug description:
  Simple test:
  hello.c

  include <stdio.h>

  int main(int argc, char* argv[])
  {
    {
      printf("Hello World... \n");
    }
    return 0;
  }

  when compiled with :
  *Compiler 
  
https://developer.arm.com/tools-and-software/server-and-hpc/arm-architecture-tools/arm-allinea-studio/download
  Arm-Compiler-for-HPC_19.3_RHEL_7_aarch64.tar   

  *Running:
  1) with -armpl
       armclang -armpl hello.c
       ./qemu/build/aarch64-linux-user/qemu-aarch64 a.out
  2) without flag
      armclang hello.c
       ./qemu/build/aarch64-linux-user/qemu-aarch64 a.out

  •With Docker image:
         CentOS Linux release 7.7.1908 (AltArch)

  *Two different machines:
         AArch64, Taishan. tsv110, Kunpeng 920, ARMv8.2-A
         AArch64, Taishan 2280, Cortex-A72, ARMv8-A

  *QEMU 4.0
       qemu-aarch64 version 4.1.91 (v4.2.0-rc1)

  
  Results:

  
   ****Taishan 2280 Cortex-A72 
        Running 
  1)with -armpl flag with and without the docker
            WORKS-> Hello World...
                 -> ldd a.out
  ldd a.out 
  linux-vdso.so.1 =>  (0x0000ffffbc6a2000) 
  libamath_generic.so => 
/scratch/arm-linux-compiler-19.3_Generic-AArch64_RHEL-8_aarch64-linux/lib/clang/9.0.1/armpl_links/lib/libamath_generic.so
 (0x0000ffffbc544000) 
  libm.so.6 => /lib64/libm.so.6 (0x0000ffffbc493000) 
  libastring_generic.so => 
/scratch/arm-linux-compiler-19.3_Generic-AArch64_RHEL-8_aarch64-linux/lib/clang/9.0.1/armpl_links/lib/libastring_generic.so
 (0x0000ffffbc472000) libarmflang.so => 
/scratch/arm-linux-compiler-19.3_Generic-AArch64_RHEL-8_aarch64-linux/lib/libarmflang.so
 (0x0000ffffbbfd3000) 
  libomp.so => 
/scratch/arm-linux-compiler-19.3_Generic-AArch64_RHEL-8_aarch64-linux/lib/libomp.so
 (0x0000ffffbbef5000) 
  librt.so.1 => /lib64/librt.so.1 (0x0000ffffbbed4000) 
  libpthread.so.0 => /lib64/libpthread.so.0 (0x0000ffffbbe9f000) 
  libarmpl_lp64_generic.so => 
/scratch/arm-linux-compiler-19.3_Generic-AArch64_RHEL-8_aarch64-linux/lib/clang/9.0.1/armpl_links/lib/libarmpl_lp64_generic.so
 (0x0000ffffb3306000) 
  libc.so.6 => /lib64/libc.so.6 (0x0000ffffb3180000) 
  libstdc++.so.6 => 
/scratch/gcc-9.2.0_Generic-AArch64_RHEL-8_aarch64-linux/lib64/libstdc++.so.6 
(0x0000ffffb2f30000) 
  libgcc_s.so.1 => 
/scratch/gcc-9.2.0_Generic-AArch64_RHEL-8_aarch64-linux/lib64/libgcc_s.so.1 
(0x0000ffffb2eff000) 
  libdl.so.2 => /lib64/libdl.so.2 (0x0000ffffb2ede000) 
  /lib/ld-linux-aarch64.so.1 (0x0000ffffbc674000)
             

  Running 
  2) without -armpl flag with and without the docker
             WORKS -> Hello World...        
                   -> ldd a.out
  ldd a.out
   linux-vdso.so.1 =>  (0x0000ffffa6895000) 
  libastring_generic.so => 
/scratch/arm-linux-compiler-19.3_Generic-AArch64_RHEL-8_aarch64-linux/lib/clang/9.0.1/armpl_links/lib/libastring_generic.so
 (0x0000ffffa6846000) 
  libc.so.6 => /lib64/libc.so.6 (0x0000ffffa66c0000) 
  /lib/ld-linux-aarch64.so.1 (0x0000ffffa6867000)
      

  ****Taishan - tsv110  Kunpeng 920
         For Running 

  1)with -armpl flag with and without the docker
             DOES NOT WORK -> with and without Docker
                           -> It shows : qemu:handle_cpu_signal received signal 
outside vCPU
   context @ pc=0xffffaaa8844a
                           -> ldd a.out 
  ldd a.out 
  linux-vdso.so.1 =>  (0x0000ffffad4b0000)
  libamath_generic.so => 
/scratch/arm-linux-compiler-19.3_Generic-AArch64_RHEL-8_aarch64-linux/lib/clang/9.0.1/armpl_links/lib/libamath_generic.so
 (0x0000ffffad370000) 
  libm.so.6 => /lib64/libm.so.6 (0x0000ffffad2a0000) 
  libastring_generic.so => 
/scratch/arm-linux-compiler-19.3_Generic-AArch64_RHEL-8_aarch64-linux/lib/clang/9.0.1/armpl_links/lib/libastring_generic.so
 (0x0000ffffad270000) libarmflang.so => 
/scratch/arm-linux-compiler-19.3_Generic-AArch64_RHEL-8_aarch64-linux/lib/libarmflang.so
 (0x0000ffffacdd0000) 
  libomp.so => 
/scratch/arm-linux-compiler-19.3_Generic-AArch64_RHEL-8_aarch64-linux/lib/libomp.so
 (0x0000ffffaccf0000) 
  librt.so.1 => /lib64/librt.so.1 (0x0000ffffaccc0000) 
  libpthread.so.0 => /lib64/libpthread.so.0 (0x0000ffffacc80000) 
  libarmpl_lp64_generic.so => 
/scratch/arm-linux-compiler-19.3_Generic-AArch64_RHEL-8_aarch64-linux/lib/clang/9.0.1/armpl_links/lib/libarmpl_lp64_generic.so
 (0x0000ffffa40e0000) 
  libc.so.6 => /lib64/libc.so.6 (0x0000ffffa3f50000) 
  libstdc++.so.6 => 
/scratch/gcc-9.2.0_Generic-AArch64_RHEL-8_aarch64-linux/lib64/libstdc++.so.6 
(0x0000ffffa3d00000) 
  libgcc_s.so.1 => 
/scratch/gcc-9.2.0_Generic-AArch64_RHEL-8_aarch64-linux/lib64/libgcc_s.so.1 
(0x0000ffffa3cc0000)
  libdl.so.2 => /lib64/libdl.so.2 (0x0000ffffa3c90000) 
  /lib/ld-linux-aarch64.so.1 (0x0000ffffad4c0000)
              

  Running 
  2) without -armpl flag with and without the docker
                 WORKS -> Hello World..
                       -> ldd a.out
  ldd a.out  
  linux-vdso.so.1 =>  (0x0000ffff880c0000) 
  libastring_generic.so => 
/scratch/arm-linux-compiler-19.3_Generic-AArch64_RHEL-8_aarch64-linux/lib/clang/9.0.1/armpl_links/lib/libastring_generic.so
 (0x0000ffff88080000) 
  libc.so.6 => /lib64/libc.so.6 (0x0000ffff87ee0000)
  /lib/ld-linux-aarch64.so.1 (0x0000ffff880d0000)

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