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author | Maciej W. Rozycki <macro@imgtec.com> | 2017-06-16 00:08:29 +0100 |
---|---|---|
committer | Ben Hutchings <ben@decadent.org.uk> | 2017-10-12 15:27:57 +0100 |
commit | b378d62f9041a3ce67b185fc30774c2e7ef3d727 (patch) | |
tree | 2568eb7520c08d6afa451755c8b30b979915d203 | |
parent | 9840bcc871b6dd1c86eedc3a9ad876c8e8a00f2c (diff) | |
download | linux-stable-b378d62f9041a3ce67b185fc30774c2e7ef3d727.tar.gz linux-stable-b378d62f9041a3ce67b185fc30774c2e7ef3d727.tar.bz2 linux-stable-b378d62f9041a3ce67b185fc30774c2e7ef3d727.zip |
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>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
-rw-r--r-- | arch/mips/kernel/branch.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/arch/mips/kernel/branch.c b/arch/mips/kernel/branch.c index c1e6f9044497..5d34d60919f1 100644 --- a/arch/mips/kernel/branch.c +++ b/arch/mips/kernel/branch.c @@ -396,7 +396,7 @@ 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. */ @@ -633,8 +633,9 @@ int __compute_return_epc_for_insn(struct pt_regs *regs, return ret; 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; } EXPORT_SYMBOL_GPL(__compute_return_epc_for_insn); |