Possible problem with gas on MIPS

Koundinya.K kk@ddeorg.soft.net
Thu Jun 8 03:06:00 GMT 2000


Hi,
 On the tons of assembler code I have I can see that R_MIPS_PC16 type of 
relocation is used by objects modules to contain external references from
branch opcodes.

I would suspect that the shift for R_MIPS_PC16 has not been documented in 
the ABI or elsewhere and has just been missed out.


Can't  R_MIPS_PC16 be used for BFD_RELOC_16_PCREL_S2 relocations?
This should solve the problem which would also allow object modules to 
contain external references from branch opcodes. Also there is not that much 
heavy use of R_MIPS_PC16.

koundinya




-> > RELOCATION RECORDS FOR [.text]:
-> > OFFSET   TYPE              VALUE 
-> > 00000004 R_MIPS_PC16       noerror
-> 
-> How is this supposed to work?  R_MIPS_PC16 doesn't shift out the lower two
-> bits of the offset, so the branch instructions can not possibly use this
-> relocation type.  However can do this with the R_MIPS_GNU_REL16_S2 relocation
-> which is a Cygnus extension.
-> 
-> > li.s: Assembler messages:
-> > li.s:3: Error: Can not represent BFD_RELOC_16_PCREL_S2 relocation in this 
-> > object file format
-> 
-> I tried it and it goes through the assembler if you use -membedded-pic.  I
-> have not tested it any further though.
-> 
-> Ulf
-> 




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