• Arnd Bergmann's avatar
    [POWERPC] spufs: add infrastructure for finding elf objects · 86767277
    Arnd Bergmann authored
    This adds an 'object-id' file that the spe library can
    use to store a pointer to its ELF object. This was
    originally meant for use by oprofile, but is now
    also used by the GNU debugger, if available.
    
    In order for oprofile to find the location in an spu-elf
    binary where an event counter triggered, we need a way
    to identify the binary in the first place.
    
    Unfortunately, that binary itself can be embedded in a
    powerpc ELF binary. Since we can assume it is mapped into
    the effective address space of the running process,
    have that one write the pointer value into a new spufs
    file.
    
    When a context switch occurs, pass the user value to
    the profiler so that can look at the mapped file (with
    some care).
    Signed-off-by: default avatarArnd Bergmann <arnd.bergmann@de.ibm.com>
    Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
    86767277
spu.h 22.2 KB