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We are looking at integrating Vector Extensions (AKA Altivec or VMX) into glibc for PPC32/PPC64. This will change the size of __jmp_buf and sigcontext/ucontext and requires versioning of the corresponding functions (setjmp/longjmp etc). I assume this includes the complete function stack, for example [siglongjmp | longjmp] -> [__libc_siglongjmp | __libc_longjmp] -> __longjmp. But looking at linuxthreads/ptlongjmp.c and nptl/pt-longjmp.c I don't understand why we need the siglongjmp()/longjmp() stubs. They add path-length without adding any function (at least in the current implementation). So could these stubs be eliminated and replaced with aliases? If they are required where should I move ptlongjmp.c to (sysdeps/pthreads, sysdeps/generic, ...) so I can override it for powerpc[32 | 64]? Or should the siglongjmp()/longjmp() stubs be split out of ptlongjmp.c?
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