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MIPS: Send SIGILL for BPOSGE32 in `__compute_return_epc_for_insn'

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commit 7b82c1058a upstream.

Fix commit e50c0a8fa6 ("Support the MIPS32 / MIPS64 DSP ASE.") and
send SIGILL rather than SIGBUS whenever an unimplemented BPOSGE32 DSP
ASE instruction has been encountered in `__compute_return_epc_for_insn'
as our Reserved Instruction exception handler would in response to an
attempt to actually execute the instruction.  Sending SIGBUS only makes
sense for the unaligned PC case, since moved to `__compute_return_epc'.
Adjust function documentation accordingly, correct formatting and use
`pr_info' rather than `printk' as the other exit path already does.

Fixes: e50c0a8fa6 ("Support the MIPS32 / MIPS64 DSP ASE.")
Signed-off-by: Maciej W. Rozycki <macro@imgtec.com>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/16396/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
[bwh: Backported to 3.2:
 - Drop the comment change
 - Adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
This commit is contained in:
Maciej W. Rozycki 2017-06-16 00:08:29 +01:00 committed by Ben Hutchings
parent f35e6385a5
commit d0f3f61064
1 changed files with 3 additions and 2 deletions
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5
arch/mips/kernel/branch.c
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@ -247,7 +247,8 @@ unaligned:
return -EFAULT;
sigill:
printk("%s: DSP branch but not DSP ASE - sending SIGBUS.\n", current->comm);
force_sig(SIGBUS, current);
pr_info("%s: DSP branch but not DSP ASE - sending SIGILL.\n",
current->comm);
force_sig(SIGILL, current);
return -EFAULT;
}