diff options
| author | Mischa Jonker <mjonker@synopsys.com> | 2013-09-26 15:44:56 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-10-18 07:45:45 -0700 |
| commit | 5cd12e7776183668bd92a5f5fe102113d3bb599a (patch) | |
| tree | 10fbc5aaa32e28dd60f2c98fac84c5f561406ace /arch | |
| parent | 8036c31c84117707d4132cd199d997d7ed41427c (diff) | |
ARC: Handle zero-overhead-loop in unaligned access handler
commit c11eb222fd7d4db91196121dbf854178505d2751 upstream.
If a load or store is the last instruction in a zero-overhead-loop, and
it's misaligned, the loop would execute only once.
This fixes that problem.
Signed-off-by: Mischa Jonker <mjonker@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arc/kernel/unaligned.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/arc/kernel/unaligned.c b/arch/arc/kernel/unaligned.c index 4cd81633feb..116d3e09b5b 100644 --- a/arch/arc/kernel/unaligned.c +++ b/arch/arc/kernel/unaligned.c @@ -233,6 +233,12 @@ int misaligned_fixup(unsigned long address, struct pt_regs *regs, regs->status32 &= ~STATUS_DE_MASK; } else { regs->ret += state.instr_len; + + /* handle zero-overhead-loop */ + if ((regs->ret == regs->lp_end) && (regs->lp_count)) { + regs->ret = regs->lp_start; + regs->lp_count--; + } } return 0; |