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I am working on this code where, I need to get the instructions executed by a program, given the instruction pointers. Assume for now that I have a mechanism that provides me addresses of the instructions, would it be possible to get the opcode from this (on an IA32 instruction set) ?
You need an in memory disassembler, such as BeaEngine or DiStorm, these can be passed a memory address to read from, just make sure the address is readable. If you know the length in bytes of the function, its a little better to use the Run-Length-Dissassemblers also provided on those sites.