wuxi wrote: > Hi: > I am wondered whether a binary, especially the one produced by a > compiler, can have *data* embedded in its instruction stream. > > I believe there can be but is there a real example ? > > jump table may not be the correct example, as every time the compiler > generates a jump table in assembly file, it will put a .rodata directive > before generating the data in jump table. So it actually residents in > rodata section, not text. > > I want to have a full description of the example, or even better, a > binary file illustrating the example. Some arches load constants with simple PC-relative memory reads, and these typically have a range of only a fe kbytes from the PC. In large functions we have to insert these into the function body and jump around them. See arm_reorg in gcc/config/arm/arm.c. Andrew.
