Namhyung Kim 69b312cde4 [llvm-objdump] Create fake sections for a ELF core file ...

The linux perf tools use /proc/kcore for disassembly kernel functions.
Actually it copies the relevant parts to a temp file and then pass it to
objdump. But it doesn't have section headers so llvm-objdump cannot
handle it.

Let's create fake section headers for the program headers. It'd have a
single section for each segment to cover the entire range. And for this
purpose we can consider only executable code segments.

With this change, I can see the following command shows proper outputs.

perf annotate --stdio --objdump=/path/to/llvm-objdump

Differential Revision: https://reviews.llvm.org/D128705

2022-07-14 13:39:59 +01:00

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