linux-kernel - Re: [PATCH 1/8] kgdb: core API and gdb protocol handler

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Date:	Sat, 9 Feb 2008 13:51:00 -0800
From:	"Ray Lee" <ray-lk@...rabbit.org>
To:	"Christoph Hellwig" <hch@...radead.org>
Cc:	jason.wessel@...driver.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/8] kgdb: core API and gdb protocol handler

2008/2/9 Ray Lee <ray-lk@...rabbit.org>:
> On Feb 9, 2008 9:27 AM, Christoph Hellwig <hch@...radead.org> wrote:
> > On Sat, Feb 09, 2008 at 07:35:07AM -0600, jason.wessel@...driver.com wrote:
> > > +#ifdef __BIG_ENDIAN
> > > +             *buf++ = hexchars[(tmp_s >> 12) & 0xf];
> > > +             *buf++ = hexchars[(tmp_s >> 8) & 0xf];
> > > +             *buf++ = hexchars[(tmp_s >> 4) & 0xf];
> > > +             *buf++ = hexchars[tmp_s & 0xf];
> > > +#else
> > > +             *buf++ = hexchars[(tmp_s >> 4) & 0xf];
> > > +             *buf++ = hexchars[tmp_s & 0xf];
> > > +             *buf++ = hexchars[(tmp_s >> 12) & 0xf];
> > > +             *buf++ = hexchars[(tmp_s >> 8) & 0xf];
> > > +#endif
> >
> > This is really ugly, but I don't really know a good way around it
> > either.
>
> void u32_to_hex(u32 val, unsigned char *buf)
> {
>          int i;
>
>          for (i=7; i>=0; i--) {
>                   buf[i] = hexchars[ val & 0x0f ];
>                   val >>= 4;
>          }
> }
>
>          u32_to_hex(tmp_s, buf);
>          buf += 8;
>

Sorry, rewrote what I thought I read, not what was there. I guess
you'd want it more along the lines of

   void u32_to_hex(u32 x, unsigned char *buf)
   {
          int i;
          int val = cpu_to_be32( x );

          for (i=7; ...
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