Commit Graph

34 Commits

Author SHA1 Message Date
John Baldwin
993d074be6 Use __SCCSID for SCCS IDs in libkvm sources.
Rather than using #ifdef's around a static char array, use the
existing helper macro from <sys/cdefs.h> for SCCS IDs.  To
preserve existing behavior, add -DNO__SCCSID to CFLAGS to not
include SCCS IDs in the built library by default.

Reviewed by:	brooks, dab (older version)
Reviewed by:	rgrimes
Differential Revision:	https://reviews.freebsd.org/D15459
2018-05-22 15:52:22 +00:00
Pedro F. Giffuni
8a16b7a18f General further adoption of SPDX licensing ID tags.
Mainly focus on files that use BSD 3-Clause license.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

Special thanks to Wind River for providing access to "The Duke of
Highlander" tool: an older (2014) run over FreeBSD tree was useful as a
starting point.
2017-11-20 19:49:47 +00:00
Will Andrews
ec8659b385 libkvm: fix lib32 build. 2017-11-12 03:28:47 +00:00
Enji Cooper
881b0edb8f libkvm: fix warning issues post-r291406
- Fix -Wunused warnings with *_native detection handlers by marking `kd`
  __unused, except with arm/mips, where a slightly more complicated scheme
  is required to handle the native case vs the non-native case.
- Fix -Wmissing-variable-declarations warnings by marking struct kvm_arch
  objects static.

Differential Revision:	D10071
MFC after:	1 week
Reviewed by:	vangyzen
Tested with:	WIP test code (D10024) // kgdb7121 (i386 crash/kernel on amd64)
Sponsored by:	Dell EMC Isilon
2017-03-22 02:42:00 +00:00
Warner Losh
fbbd9655e5 Renumber copyright clause 4
Renumber cluase 4 to 3, per what everybody else did when BSD granted
them permission to remove clause 3. My insistance on keeping the same
numbering for legal reasons is too pedantic, so give up on that point.

Submitted by:	Jan Schaumann <jschauma@stevens.edu>
Pull Request:	https://github.com/freebsd/freebsd/pull/96
2017-02-28 23:42:47 +00:00
Enji Cooper
fb0e1892d9 Fix up pointer issues with lib/libkvm
In particular,
- avoid dereferencing NULL pointers
- test pointers against NULL, not 0
- test for errout == NULL in the top-level functions (kvm_open, kvm_openfiles,
  kvm_open2, etc)
- Replace a realloc and free on failure with reallocf

Found with: devel/cocchinelle

Differential Revision: https://reviews.freebsd.org/D5954
MFC after: 1 week
Reviewed by: jhb
Sponsored by: EMC / Isilon Storage Division
2016-04-22 18:05:34 +00:00
John Baldwin
7f911abe54 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
2015-11-27 18:58:26 +00:00
John Baldwin
9789cd30e5 Remove trailing whitespace. 2015-11-26 19:42:10 +00:00
Marcel Moolenaar
e7d939bda2 Remove ia64.
This includes:
o   All directories named *ia64*
o   All files named *ia64*
o   All ia64-specific code guarded by __ia64__
o   All ia64-specific makefile logic
o   Mention of ia64 in comments and documentation

This excludes:
o   Everything under contrib/
o   Everything under crypto/
o   sys/xen/interface
o   sys/sys/elf_common.h

Discussed at: BSDcan
2014-07-07 00:27:09 +00:00
Kevin Lo
bedceb7c9c If the IdlePDPT is not present, PAE is not active 2012-09-10 08:16:45 +00:00
Ulrich Spörlein
c10970dd7d libkvm code janitoring
- make WARNS=6 clean for archs w/o strict alignment requirments
- add const, ANSIfy, remove unused vars, cast types for comparison
- thanks to differing definitions of VM_MIN_ADDRESS across our archs, we
  need to trick the compiler to not complain about signedness. We could
  either fix VM_MIN_ADDRESS to always be a simple integer or make the
  check conditional on $ARCH.

Closes PRs:	kern/42386, kern/83364
Reviewed by:	bde
2011-01-23 11:08:28 +00:00
John Baldwin
50c3239e85 Fix a copy-paste bug when reading data from the last 3 (7 for PAE) bytes of
a page mapped by a large page in the kernel.

Submitted by:	Dorr H. Clark  dclark of engr.scu.edu
MFC after:	1 week
2009-11-06 13:10:12 +00:00
Ed Schouten
953e4134b5 Fix missing includes of <string.h>, to silence some compiler warnings.
Submitted by:	Pawel Worach
2009-06-14 12:42:06 +00:00
Hidetoshi Shimokawa
d7dc9f7649 Re-enable raw dump format support on i386 and amd64 for /dev/fwmem. 2007-06-15 11:35:11 +00:00
Warner Losh
67e405315d Remove the advertising clause. UCB did this some time ago, but these
files were never updated to reflect that.

MFC After: 2 days
2007-01-08 17:35:36 +00:00
Peter Wemm
e9ca6fe47e Teach libkvm how to read minidumps. It turns out that minidumps are
far more convenient for libkvm to work with because of the page table
block at the beginning.  As a result, the MD code is smaller.

libkvm will automatically detect old vs mini dumps on i386 and amd64.

libkvm will handle i386 PAE and non-PAE modes.  There is a PAE flag in
the i386 minidump header to signal the width of the entries in the
page table block.

Other convenient values are also present, such as kernbase and the direct
map addresses on amd64.
2006-04-21 04:32:51 +00:00
Peter Wemm
add112ff65 Fix a well duplicated fencepost error that stopped crashdumps being
readable on certain random memory configurations.  If the libkvm consumer
tried to read something that was in the very last pdpe, pde or pte slot,
it would bogusly fail.

This is broken in RELENG_6 too.
2005-10-20 05:41:38 +00:00
Paul Saab
da2ef70999 Match _kvm_kvatop to it's prototype in kvm_i386.c. This unbreaks
the build.

Approved by:	re
2005-06-30 01:25:21 +00:00
Peter Wemm
e55a0cd805 Support crash dumps > 4GB in size on 32 bit platforms. _kvm_kvatop()
returned an lseek offset in a "u_long *" value, which can't express >4GB
offsets on 32 bit machines (eg: PAE).  Change to "off_t *" for all.

Support ELF crashdumps on i386 and amd64.

Support PAE crashdumps on i386.  This is done by auto-detecting the
presence of the IdlePDPT which means that PAE is active.

I used Marcel's _kvm_pa2off strategy and ELF header reader for ELF support
on amd64.  Paul Saab ported the amd64 changes to i386 and we implemented
the PAE support from there.

Note that gdb6 in the src tree uses whatever libkvm supports.  If you want
to debug an old crash dump, you might want to keep an old libkvm.so handy
and use LD_PRELOAD or the like.  This does not detect the old raw dump
format.

Approved by: re
2005-06-29 22:39:41 +00:00
Bruce Evans
6eabd84580 Compensate for "Compensate for header dethreading" by backing it out. 2001-10-10 17:48:44 +00:00
Matthew Dillon
e67f5b9fca Implement __FBSDID() 2001-09-16 21:35:07 +00:00
Peter Wemm
f85f304006 Dynamically adjust to the value of KERNBASE in a crashdump, with
a fallback for old kernels without the "kernbase" symbol.
2001-08-24 08:53:30 +00:00
Mark Murray
82633431b3 Compensate for header dethreading. 2001-05-01 09:24:15 +00:00
Peter Wemm
c4a7cdb3b6 Use kldsym(2) to lookup symbol values. This avoids the kvm_mkdb juggling
and is module aware.  Yes, this means that kvm_nlist(3) will find symbols
in loaded modules.  The emulation of the nlist struct is pretty crude but
seems to work well enough for all the users in the tree that I found.
1999-12-27 07:14:58 +00:00
Tor Egge
4afb0d5a5b Copy code from gnu/usr.bin/gdb/gdb/kvm-fbsd.c to deal with 4 MB pages. 1997-08-17 17:42:59 +00:00
Peter Wemm
2f85bf6e8e Implement virtual-to-physical address mapping for the kvm library on
dead kernel debugging.  The previous code was a "do nothing".

The most obvious side effect of this is that you can now do things like
this and reasonably expect them to work:
  dmesg -M /var/crash/vmcore.3 -N /var/crash/kernel.3
  ps -axl -M /var/crash/vmcore.3 -N /var/crash/kernel.3

A good deal of this was lifted from the gdb code to do this, as well as
from NetBSD's libkvm (which has completely different VM macros)
1996-10-07 20:17:50 +00:00
Jordan K. Hubbard
51295a4d3e General -Wall warning cleanup, part I.
Submitted-By: Kent Vander Velden <graphix@iastate.edu>
1996-07-12 18:57:58 +00:00
Poul-Henning Kamp
2572133ed3 NBPG -> PAGE_SIZE 1996-05-02 09:23:36 +00:00
Rodney W. Grimes
6c06b4e2aa Remove trailing whitespace. 1995-05-30 05:51:47 +00:00
Poul-Henning Kamp
3f318480d8 A semicolon was lost. 1994-11-07 19:54:55 +00:00
Jordan K. Hubbard
e4bd62878a From: "gj%pcs.dec.com@inet-gw-1.pa.dec.com" <garyj@rks32.pcs.dec.com>
Given the right circumstances, a call to kvm_open can result in a core
dump.

The diff belows fixes this (note that this change is already in the
NetBSD code). Could somebody apply this?

Gary J.
Submitted by:	gj
1994-11-07 09:42:24 +00:00
David Greenman
338c75418e Made kvm routines use procfs to get out process data such as argument
strings.
1994-08-11 13:38:23 +00:00
Rodney W. Grimes
21d54b076d Fix kvm_i386.c just enough to make it compile and return lots of errors
when called.  Noop out swapread in kvm_proc.c as our vm system is
different.
1994-05-28 05:48:30 +00:00
Rodney W. Grimes
f95a02507b This is a COPY of kvm_hp300.c, soon to be patched to sorta work with
the i386 port.
1994-05-28 04:34:59 +00:00