search for: ihi0044d_aaelf

....word variable_desired past_literals: [...instructions...] In general, deciding whether to disassemble a given location as code or data is a very hard problem (think of all the evil tricks you could play with dual-purpose), so the ARM ELF ABI (http://infocenter.arm.com/help/topic/com.arm.../IHI0044D_aaelf.pdf) specifies something called mapping symbols, which assemblers should insert to tell disassemblers what's actually needed. The idea is that a $a should be inserted at the start of each section of ARM code, $t before Thumb and $d before data (including these embedded litpools). In the above...

I'm attempting to detect encoding bugs by comparing disassembly when using GCC's 'as' versus LLVM's integrated assembler. Generally this has gone very well, but one thing that adds a lot of noise is that .word marked as a R_ARM_ABS32 is disassembled as an instruction and not data. Please see the attached 'dump.diff' which was generated by diffing the "objdump -d

...s by default when printing the symbol-table (you can give it the --special-syms option to show them), but readelf shows them always. If you want the really deep details, they're fully documented in the ARM ELF ABI here (section 4.6.5): http://infocenter.arm.com/help/topic/com.arm.doc.ihi0044d/IHI0044D_aaelf.pdf Which is all nice to know, but I'm afraid it probably doesn't offer an immediate solution to the undefined instructions: + libc.so isn't a relocatable object file (well, it is dynamically, but that doesn't count). + llvm-objdump ignores them anyway at the moment, as far as I ca...

...mbol-table (you can give it the --special-syms option to show them), > but readelf shows them always. > > If you want the really deep details, they're fully documented in the > ARM ELF ABI here (section 4.6.5): > > > http://infocenter.arm.com/help/topic/com.arm.doc.ihi0044d/IHI0044D_aaelf.pdf > > Which is all nice to know, but I'm afraid it probably doesn't offer an > immediate solution to the undefined instructions: > + libc.so isn't a relocatable object file (well, it is dynamically, > but that doesn't count). > + llvm-objdump ignores them anyway...

...the --special-syms option to show them), >> but readelf shows them always. >> >> If you want the really deep details, they're fully documented in the >> ARM ELF ABI here (section 4.6.5): >> >> >> http://infocenter.arm.com/help/topic/com.arm.doc.ihi0044d/IHI0044D_aaelf.pdf >> >> Which is all nice to know, but I'm afraid it probably doesn't offer an >> immediate solution to the undefined instructions: >> + libc.so isn't a relocatable object file (well, it is dynamically, >> but that doesn't count). >> + llvm-objd...

Hi Tim, Thanks a lot for the reply. I tested libc.so which is a shared library. llvm-objdump also report some disassemble errors. Could you please tell me more about $a, $t and $d symbols? How these symbols are used to define different regions? Where I can find this symbols in ELF object file? Thanks, David I'm now try to find a decoder of ARM instructions in oder On Thu, Jun 7, 2012

...symbol-table (you can give it the --special-syms option to show them), > but readelf shows them always. > > If you want the really deep details, they're fully documented in the > ARM ELF ABI here (section 4.6.5): > > http://infocenter.arm.com/help/topic/com.arm.doc.ihi0044d/IHI0044D_aaelf.pdf > > Which is all nice to know, but I'm afraid it probably doesn't offer an > immediate solution to the undefined instructions: > + libc.so isn't a relocatable object file (well, it is dynamically, > but that doesn't count). > + llvm-objdump ignores them anyway...

...ive it the --special-syms option to show them), >> but readelf shows them always. >> >> If you want the really deep details, they're fully documented in the >> ARM ELF ABI here (section 4.6.5): >> >> http://infocenter.arm.com/help/topic/com.arm.doc.ihi0044d/IHI0044D_aaelf.pdf >> >> Which is all nice to know, but I'm afraid it probably doesn't offer an >> immediate solution to the undefined instructions: >> + libc.so isn't a relocatable object file (well, it is dynamically, >> but that doesn't count). >> + llvm-obj...

...t_literals: > [...instructions...] > > In general, deciding whether to disassemble a given location as code > or data is a very hard problem (think of all the evil tricks you could > play with dual-purpose), so the ARM ELF ABI > (http://infocenter.arm.com/help/topic/com.arm.../IHI0044D_aaelf.pdf) > specifies something called mapping symbols, which assemblers should > insert to tell disassemblers what's actually needed. > > The idea is that a $a should be inserted at the start of each section > of ARM code, $t before Thumb and $d before data (including these > emb...