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RE: MIPS: firefox binary with broken MIPS_RLD_MAP tag


Manuel Lauss wrote:
> Building firefox-8.0 natively on MIPS results in a broken binary which
> segfaults during startup in libc, due to a zero "MIPS_RLD_MAP" tag in
> the dynamic section:
> 
> Dynamic section at offset 0x1dc contains 31 entries:
>   Tag        Type                         Name/Value
>  0x00000001 (NEEDED)                     Shared library: 
> [libpthread.so.0]
>  0x00000001 (NEEDED)                     Shared library: [libdl.so.2]
>  0x00000001 (NEEDED)                     Shared library: 
> [libstdc++.so.6]
>  0x00000001 (NEEDED)                     Shared library: 
> [libgcc_s.so.1]
>  0x00000001 (NEEDED)                     Shared library: [libc.so.6]
>  0x00000001 (NEEDED)                     Shared library: [ld.so.1]
>  0x0000000c (INIT)                       0x401098
>  0x0000000d (FINI)                       0x40dc10
>  0x00000004 (HASH)                       0x4002fc
>  0x00000005 (STRTAB)                     0x400b14
>  0x00000006 (SYMTAB)                     0x400664
>  0x0000000a (STRSZ)                      948 (bytes)
>  0x0000000b (SYMENT)                     16 (bytes)
>  0x70000016 (MIPS_RLD_MAP)               0    
> <<<<<<<<<<<<<<<<<<<<<<<<<<<<<
>  0x00000015 (DEBUG)                      0x0
>  0x00000003 (PLTGOT)                     0x41f060
>  0x70000001 (MIPS_RLD_VERSION)           1
>  0x70000005 (MIPS_FLAGS)                 NOTPOT
>  0x70000006 (MIPS_BASE_ADDRESS)          0x400000
>  0x7000000a (MIPS_LOCAL_GOTNO)           49
>  0x70000011 (MIPS_SYMTABNO)              75
>  0x70000012 (MIPS_UNREFEXTNO)            42
> [...]
> 
> After removing the broken 0x70000016 tag firefox loads and runs.
> (gcc-4.6.2, binutils-2.22, glibc-2.14.1).
> 
> Please have look at this.
> 
> Thanks!
>        Manuel Lauss
> 

I hit similar issues some time ago.  I found that if I keep __RLD_MAP global in version scripts,
programs (eg: llvm, firefox) can start on MIPS Debian Linux.  Just FYI.
Thanks a lot!

Regards,
Chao-ying


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