On 08/11/2014 10:40 AM, Jan Beulich wrote: >>>>> CFI_ESCAPE 0x0f /* DW_CFA_def_cfa_expression */, 6, \ >>>>> 0x77 /* DW_OP_breg7 */, 0, \ >>>>> 0x06 /* DW_OP_deref */, \ >>>>> - 0x08 /* DW_OP_const1u */, SS+8-RBP, \ >>>>> + 0x08 /* DW_OP_const1u */, SS+8, \ >>>>> 0x22 /* DW_OP_plus */ >>>>> /* We entered an interrupt context - irqs are off: */ >>>>> TRACE_IRQS_OFF ... ... >>> While we are at it, what this CFI_ESCAPE thing does here? >>> As usual, it has no comment :/ > > Each of its lines has a comment; with other CFI annotations not > each having comments, I don't see what else is needed here.
The existing comments explain what every byte means. They are useful if CFI-literate reader wants to check correctness of the encoding of this annotation. There is no overall comment what this CFI annotation *achieves*. In human language, what do we say to DWARF decoder here? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
