Re: [PATCH] lib/hexdump

[Randy Dunlap]

Andrew Morton wrote:
> On Wed, 2 May 2007 15:35:56 -0700
> Randy Dunlap <randy.dunlap@xxxxxxxxxx> wrote:
>
> > From: Randy Dunlap <randy.dunlap@xxxxxxxxxx>
> >
> > Based on ace_dump_mem() from Grant Likely for the Xilinx 
> > SystemACE CompactFlash interface.
> >
> > Add hex_dumper() to lib/hexdump.c and linux/kernel.h.
> >
> > This patch adds the function 'hex_dumper' which can be used to perform a 
> > hex + ASCII dump of data to syslog, in an easily viewable format, thus
> > providing a common text hex dump format.
> >
> > It does not provide a hexdump_to_buffer() function.
> > if someone needs that, we'll have to add it.
> >
> > Example usage:
> > 	hex_dumper(KERN_DEBUG, data, length);
>
> Fair enough.  This is the sort of thing one could easily overdesign ;)

The Intel version also returned the number of bytes printed.
and they had a hexdump_to_buffer() for sysfs output.


> >  include/linux/kernel.h |    1 
> >  lib/Makefile           |    2 -
> >  lib/hexdump.c          |   51 +++++++++++++++++++++++++++++++++++++++++++++++++
> >  3 files changed, 53 insertions(+), 1 deletion(-)
> >
> > --- /dev/null
> > +++ linux-2.6.21-git4/lib/hexdump.c
> > @@ -0,0 +1,51 @@

> > +/**
> > + * hex_dumper - print a text hex dump to syslog for a binary blob of data
> > + * @level: kernel log level (e.g. KERN_DEBUG)
> > + * @buf: data blob to dump
> > + * @len: number of bytes in the @buf
> > + *
> > + * Given a buffer of u8 data, hex_dumper() will print a hex + ASCII dump
> > + * to the kernel log at the specified kernel log level.
> > + *
> > + * E.g.:
> > + *	hex_dumper(KERN_DEBUG, frame->data, frame->len);
> > + *
> > + * Prints the offsets of the block of memory, not addresses:
> > + * 0009ab42: 40414243 44454647 48494a4b 4c4d4e4f-@ABCDEFG HIJKLMNO
>
> But I suspect it should be printing the addresses, for many callers.
>
> In which case we'd need a separate arg (base_address or somesuch) so that
> callers who want to show real virtual addresses can pass in `base' and
> callers who want to display relative offsets can pass in 0.

OK, that's one way to do it.  I'll wait a bit for other comments.

> Which implies that the address will need to be printed as a 16-digit number
> on 64-bit kernels.

Yep.


--
~Randy
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