From ab35544b83d7494b58b4327d7a9e6d66da7ab579 Mon Sep 17 00:00:00 2001 From: jhb Date: Fri, 27 Nov 2015 18:58:26 +0000 Subject: Add support to libkvm for reading vmcores from other architectures. - Add a kvaddr_type to represent kernel virtual addresses instead of unsigned long. - Add a struct kvm_nlist which is a stripped down version of struct nlist that uses kvaddr_t for n_value. - Add a kvm_native() routine that returns true if an open kvm descriptor is for a native kernel and memory image. - Add a kvm_open2() function similar to kvm_openfiles(). It drops the unused 'swapfile' argument and adds a new function pointer argument for a symbol resolving function. Native kernels still use _fdnlist() from libc to resolve symbols if a resolver function is not supplied, but cross kernels require a resolver. - Add a kvm_nlist2() function similar to kvm_nlist() except that it uses struct kvm_nlist instead of struct nlist. - Add a kvm_read2() function similar to kvm_read() except that it uses kvaddr_t instead of unsigned long for the kernel virtual address. - Add a new kvm_arch switch of routines needed by a vmcore backend. Each backend is responsible for implementing kvm_read2() for a given vmcore format. - Use libelf to read headers from ELF kernels and cores (except for powerpc cores). - Add internal helper routines for the common page offset hash table used by the minidump backends. - Port all of the existing kvm backends to implement a kvm_arch switch and to be cross-friendly by using private constants instead of ones that vary by platform (e.g. PAGE_SIZE). Static assertions are present when a given backend is compiled natively to ensure the private constants match the real ones. - Enable all of the existing vmcore backends on all platforms. This means that libkvm on any platform should be able to perform KVA translation and read data from a vmcore of any platform. Tested on: amd64, i386, sparc64 (marius) Differential Revision: https://reviews.freebsd.org/D3341 --- lib/libkvm/kvm_proc.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'lib/libkvm/kvm_proc.c') diff --git a/lib/libkvm/kvm_proc.c b/lib/libkvm/kvm_proc.c index d4e4211..2f2b6c6 100644 --- a/lib/libkvm/kvm_proc.c +++ b/lib/libkvm/kvm_proc.c @@ -582,6 +582,12 @@ liveout: nl[5].n_name = "_cpu_tick_frequency"; nl[6].n_name = 0; + if (!kd->arch->ka_native(kd)) { + _kvm_err(kd, kd->program, + "cannot read procs from non-native core"); + return (0); + } + if (kvm_nlist(kd, nl) != 0) { for (p = nl; p->n_type != 0; ++p) ; -- cgit v1.1