search for: variable_desir

...of-implementation issue. ARM often uses literal pools in the middle of code when it needs to materialize a large constant (or variable address more likely for R_ARM_ABS32). This results in a sequence roughly like: ldr r0, special_lit_sym [...] b past_literals special_lit_sym: .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) spe...

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

...ses literal pools in the middle of code when it needs to > materialize a large constant (or variable address more likely for > R_ARM_ABS32). This results in a sequence roughly like: > > ldr r0, special_lit_sym > [...] > b past_literals > special_lit_sym: > .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/...