Dear DWARF-discuss I am writing a parser of eh-frame informations and I have a doubt about a behaviour of readelf.
On a (statically linked) binary readelf reports the following eh-frame CIE entry: 00006f38 0000000000000014 00000000 CIE Version: 1 Augmentation: "zRS" Code alignment factor: 1 Data alignment factor: -8 Return address column: 16 Augmentation data: 1b DW_CFA_nop DW_CFA_nop DW_CFA_nop DW_CFA_nop DW_CFA_nop DW_CFA_nop and readelf interprets this bytecode as: 00006f38 0000000000000014 00000000 CIE "zRS" cf=1 df=-8 ra=16 LOC CFA 0000000000000000 rax+0 My doubt is: where does the rax+0 come from? Is rax some kind of a default for CFA computation? The bytecode does not provide any real instruction here and my parser/interpreter fails with “undefined cfa”. Thank in advance. -francesco
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