Comment Re:This guy doesn't know what he's talking about. (Score 2, Informative) 315
This got +5? Mods don't know what they are reading about.
PowerPC does not store the return address on the stack; it shows up in the link register (LR), and is generally copied to a GPR when your function calls another function (because the call will overwrite the LR). That GPR may or may not wind up on the stack, depending on the number of GPRs needed by the callee. The architecture does not require that it ever be placed on the stack, which is totally defined by the ABI and not by the hardware anyway. There is absolutely no reason why PowerPC-based operating systems could not define a separate stack for data and return addresses, if the OS designers chose to do so.
PowerPC does not store the return address on the stack; it shows up in the link register (LR), and is generally copied to a GPR when your function calls another function (because the call will overwrite the LR). That GPR may or may not wind up on the stack, depending on the number of GPRs needed by the callee. The architecture does not require that it ever be placed on the stack, which is totally defined by the ABI and not by the hardware anyway. There is absolutely no reason why PowerPC-based operating systems could not define a separate stack for data and return addresses, if the OS designers chose to do so.
