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call frame instruction encodings ?


Can anyone point me or explain me the meaning of the following snippet from libffi/src/powerpc/sysv.S?

.byte 0x2f /* DW_CFA_GNU_negative_offset_extended */
.byte 0x41 /* uleb128 0x41 */
.byte 0x1 /* uleb128 0x1 */

I found the dwarf document explaining the DW_CFA and what they mean. But nothing about DW_CFA_GNU?

Any pointer would be great since I'm stuck in understanding this.

Thanks,
Andreas


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