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Blackfin: work around anomaly 05000281 

Add missing anomaly workaround for anomaly 05000281 - we can't return to
instructions which cause hardware errors otherwise we trigger the error
again which means we go into an infinite loop of handling, returning, and
retriggering.  This work around confuses gdb when the error occurs as the
PC will seemed to have moved, so a better long term fix will need to be
figured out, but for now this is better than an infinite crash loop.

Signed-off-by: Robin Getz <robin.getz@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Robin Getz 2009-06-22 20:23:48 +00:00 committed by Mike Frysinger
parent 976119bc5d
commit 0e4edcf0b0
1 changed files with 2 additions and 1 deletions
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3
arch/blackfin/kernel/traps.c
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@ -619,7 +619,8 @@ asmlinkage void trap_c(struct pt_regs *fp)
force_sig_info(sig, &info, current); force_sig_info(sig, &info, current);
} }
if (ANOMALY_05000461 && trapnr == VEC_HWERR && !access_ok(VERIFY_READ, fp->pc, 8)) if ((ANOMALY_05000461 && trapnr == VEC_HWERR && !access_ok(VERIFY_READ, fp->pc, 8)) ||
(ANOMALY_05000281 && trapnr == VEC_HWERR))
fp->pc = SAFE_USER_INSTRUCTION; fp->pc = SAFE_USER_INSTRUCTION;
traps_done: traps_done: