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It seems that most 32 bit applications will run on 64 bit linux assuming all the 32 bit libraries are present. But it seems to me there could be issues with architecture-dependent functions, and here I’m thinking of signals and setjmp/longjmp. I’m wondering if someone with greater experience could comment on what functions (if any) would cause a 32 bit app to be incompatible with a 64 bit OS.
Even
setjmpandlongjmpshould work correctly. There are no particular issues, from a user space application, which would present any issues. The actual 32bit emulation is done by the processor. System calls are the interface back to the 64bit kernel, which Linux correctly handles.If the application was evil, and sent executable code to another 64bit process to execute, then various things would break.