[Crash-utility] [PATCH 0/6] LoongArch64: improve dumpfile stack unwinding

This series improves LoongArch64 stack unwinding for vmcore dumpfiles. LoongArch exception entry code may run from relocated exception handler areas rather than from the canonical vmlinux text address. Looking up those runtime PCs directly can fail to resolve symbols such as handle_vint, which also breaks ORC lookup and exception-frame handoff. The series first fixes the exception return address label to report ERA, then maps relocated exception vector PCs back to their canonical kernel symbols. It then adds initial LoongArch64 ORC support for core kernel text, and uses the saved IRQ-stack state to continue unwinding active dumpfile tasks from IRQ stack back to task stack. The last two patches tighten fallback RA handling and only print exception pt_regs with bt -f. Tested: - Built each patch separately with make lzo -j4 on LoongArch64. - Built the final tree with make -j4 on the X86_64. - Verified kdump vmcore backtrace still shows the sysrq panic chain. - Verified git diff --check d0ffcb681f06..HEAD. Ming Wang (6): LoongArch64: print exception return address as ERA LoongArch64: resolve relocated exception vector addresses LoongArch64: add initial ORC unwinder support LoongArch64: unwind dumpfile active tasks from IRQ stacks LoongArch64: avoid replacing a valid RA with stack noise LoongArch64: print exception registers only with bt -f defs.h | 27 ++ loongarch64.c | 689 ++++++++++++++++++++++++++++++++++++++++++++++++-- 2 files changed, 695 insertions(+), 21 deletions(-) -- 2.43.0