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, 9 insertions, 8 deletions

diff --git a/sys/sparc64/include/kerneldump.h b/sys/sparc64/include/kerneldump.h
index 7fad3fc..684c9e3 100644
--- a/sys/sparc64/include/kerneldump.h
+++ b/sys/sparc64/include/kerneldump.h
@@ -29,9 +29,9 @@
 #define	_MACHINE_KERNELDUMP_H_
 
 struct sparc64_dump_reg {
-	vm_paddr_t	dr_pa;
-	vm_offset_t	dr_size;
-	vm_offset_t	dr_offs;
+	uint64_t	dr_pa;
+	uint64_t	dr_size;
+	uint64_t	dr_offs;
 };
 
 /*
@@ -40,11 +40,12 @@ struct sparc64_dump_reg {
  * would require some ugly hacks.
  */
 struct sparc64_dump_hdr {
-	vm_offset_t	dh_hdr_size;
-	vm_paddr_t	dh_tsb_pa;
-	vm_size_t	dh_tsb_size;
-	vm_size_t	dh_tsb_mask;
-	int		dh_nregions;
+	uint64_t	dh_hdr_size;
+	uint64_t	dh_tsb_pa;
+	uint64_t	dh_tsb_size;
+	uint64_t	dh_tsb_mask;
+	int32_t		dh_nregions;
+	int32_t		dh_pad;
 	struct sparc64_dump_reg	dh_regions[];
 };