[Crash-utility] [PATCH 0/5] LoongArch64: Fix register notes and exception unwinding

This series fixes several LoongArch64 crash utility issues seen when reading CPU register state and unwinding active tasks from vmcore files. The first two patches fix register extraction from NT_PRSTATUS/crash notes and initialize the pt_regs.regs offset used for active task register fallback. The remaining patches improve backtracing across LoongArch exception frames, fix the stack top boundary check for pt_regs, and avoid a null eframe_search callback when bt -e is requested. The NT_PRSTATUS register layout follows the LoongArch kernel elf_gregset_t/struct pt_regs order: 32 GPRs followed by orig_a0, csr_era, csr_badvaddr, csr_crmd, csr_prmd, csr_euen, csr_ecfg and csr_estat. The exception unwinding changes only treat entry symbols that leave a saved pt_regs at sp as exception frames. Tested: - LoongArch 3C6000 platform with vmcore - make -C crash -j$(nproc) on x86_64 host - gcc -DLOONGARCH64 -c -o /tmp/loongarch64-final.o loongarch64.c - gcc -c -o /tmp/loongarch64-final-generic.o loongarch64.c - git diff --check origin/master..HEAD Ming Wang (5): LoongArch64: Fix CPU registers reading from dump notes LoongArch64: Fix pt_regs initialization for active tasks LoongArch64: Support backtracing across exception boundaries LoongArch64: Fix stack frame loop bounds for exception frames LoongArch64: Add dummy eframe_search to avoid bt -e segfault loongarch64.c | 78 +++++++++++++++++++++++++++++++++++++++------------ 1 file changed, 60 insertions(+), 18 deletions(-) -- 2.43.0