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| author | Mischa Jonker <mjonker@synopsys.com> | 2013-09-26 15:44:56 +0200 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2013-09-27 12:58:23 +0200 |
| commit | c11eb222fd7d4db91196121dbf854178505d2751 (patch) | |
| tree | c5f58279b31fb1828d20ddc42adc0fa584bbfc12 | |
| parent | Linux 3.12-rc2 (diff) | |
| download | linux-c11eb222fd7d4db91196121dbf854178505d2751.tar.xz linux-c11eb222fd7d4db91196121dbf854178505d2751.zip | |
ARC: Handle zero-overhead-loop in unaligned access handler
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>
| -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 28d170060747..7ff5b5c183bb 100644 --- a/arch/arc/kernel/unaligned.c +++ b/arch/arc/kernel/unaligned.c @@ -245,6 +245,12 @@ 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; |