tree 4b380073ddb66b53a6570add78545e2531c8a2e9
parent 639f9dc6afe6fc49975c17235551ceba06a291f5
author Djordje Todorovic <djordje.todorovic@syrmia.com> 1609317500 -0800
committer Copybara-Service <copybara-worker@google.com> 1612822022 -0800

[elf-core] Improve reading memory from core file

This patch tries to improve memory-read from core files
(in order to improve disassembly functionality).

I am using RHEL 7.7 (linux kernel 3.10) and for a lot of cases,
I was not able to disassemble some functions from backtrace when
debugging crashes from core files. It outputs some dummy code.

The cause of the problem was the fact we are returning all the zeros
from ProcessElfCore::ReadMemory() that is being called within
Disassembler::ParseInstructions() and it disassembles some dummy
opcodes from the buffer returned. Therefore, we are removing zero
bytes filling (padding) completely.

Differential Revision: https://reviews.llvm.org/D93939

GitOrigin-RevId: 9abd8c1a4c3870f2831ee805cd3c0cec516a1c17