MIPS: Send SIGILL for BPOSGE32 in `__compute_return_epc_for_insn'

commit 7b82c1058ac1f8f8b9f2b8786b1f710a57a870a8 upstream.

Fix commit e50c0a8fa60d ("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: e50c0a8fa60d ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/mips/kernel/branch.c b/arch/mips/kernel/branch.c
index 59fe7725a610da23763e8a3ea514834fc68e2510..16749f1843670f9af8434aad94ab8177970b93b2 100644 (file)
--- a/arch/mips/kernel/branch.c
+++ b/arch/mips/kernel/branch.c
@@ -399,7 +399,7 @@ int __MIPS16e_compute_return_epc(struct pt_regs *regs)
  *
  * @regs:      Pointer to pt_regs
  * @insn:      branch instruction to decode
- * @returns:   -EFAULT on error and forces SIGBUS, and on success
+ * @returns:   -EFAULT on error and forces SIGILL, and on success
  *             returns 0 or BRANCH_LIKELY_TAKEN as appropriate after
  *             evaluating the branch.
  *
@@ -844,8 +844,9 @@ int __compute_return_epc_for_insn(struct pt_regs *regs,
        return ret;
 
 sigill_dsp:
-       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;
 sigill_r6:
        pr_info("%s: R2 branch but r2-to-r6 emulator is not preset - sending SIGILL.\n",