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MIPS: Fix BREAK code interpretation heuristics

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Do not lose the other half of the BREAK code where there is an upper
half.  This is so that e.g. `BREAK 7, 7' is not interpreted as a divide
by zero trap, while `BREAK 0, 7' or `BREAK 7, 0' still are.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9697/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Maciej W. Rozycki 2015-04-03 23:26:32 +01:00 committed by Ralf Baechle
parent f6a31da501
commit c987503201
1 changed files with 1 additions and 1 deletions
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arch/mips/kernel/traps.c
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@ -943,7 +943,7 @@ asmlinkage void do_bp(struct pt_regs *regs)
* We handle both cases with a simple heuristics. --macro
*/
if (bcode >= (1 << 10))
bcode >>= 10;
bcode = ((bcode & ((1 << 10) - 1)) << 10) | (bcode >> 10);
/*
* notify the kprobe handlers, if instruction is likely to