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

1 files changed, 1 insertions, 1 deletions

diff --git a/rescue/rescue/Makefile b/rescue/rescue/Makefile
index 45a6cc2..9b612d0 100644
--- a/rescue/rescue/Makefile
+++ b/rescue/rescue/Makefile
@@ -53,7 +53,7 @@ CRUNCH_PROGS_bin= cat chflags chio chmod cp date dd df echo 	\
 	 ed expr getfacl hostname kenv kill ln ls mkdir mv	\
 	 pkill ps pwd realpath rm rmdir setfacl sh sleep stty	\
 	 sync test
-CRUNCH_LIBS+= -lcrypt -ledit -ljail -lkvm -ll -ltermcapw -lutil -lxo
+CRUNCH_LIBS+= -lcrypt -ledit -ljail -lkvm -lelf -ll -ltermcapw -lutil -lxo
 CRUNCH_BUILDTOOLS+= bin/sh
 
 # Additional options for specific programs