| To: | Jun Sun <jsun@mvista.com> |
|---|---|
| Subject: | Re: load_unaligned() and "uld" instruction |
| From: | Ralf Baechle <ralf@oss.sgi.com> |
| Date: | Fri, 6 Oct 2000 18:32:08 +0200 |
| Cc: | "Kevin D. Kissell" <kevink@mips.com>, linux-mips@fnet.fr, linux-mips@oss.sgi.com |
| In-reply-to: | <39DD68DE.E9B26A3D@mvista.com>; from jsun@mvista.com on Thu, Oct 05, 2000 at 10:53:34PM -0700 |
| References: | <200009252116.WAA01137@gladsmuir.algor.co.uk> <39CFC567.DD66BC56@mvista.com> <000d01c02782$32d31560$0deca8c0@Ulysses> <39D0E51C.79A0BE50@mvista.com> <20001005141354.E30075@bacchus.dhis.org> <39DD26CC.3805FFE8@mvista.com> <00d101c02f04$3a6d7340$0deca8c0@Ulysses> <39DD55E9.AFCACB0E@mvista.com> <011801c02f19$1283f6a0$0deca8c0@Ulysses> <39DD68DE.E9B26A3D@mvista.com> |
On Thu, Oct 05, 2000 at 10:53:34PM -0700, Jun Sun wrote: > Although the usb does use get_unaligned(u64) (ldl/ldr), it actually does > not run into it - at least in my test so far. That probably explains > why my fix runs on the R5432 CPU so far. No, you just never hit the window where the your 64-bit reg got corrupted by an exception. The old broken macros also had a cast to long in them which was truncating the loaded 64-bit word so in 100% of cases the upper 32-bit was modified in creative ways. So I guess you were just lucky and never hit the case were this actually bits. Ralf |
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