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| author | James Yang <James.Yang@freescale.com> | 2013-07-03 16:26:47 -0500 |
|---|---|---|
| committer | Scott Wood <scottwood@freescale.com> | 2013-10-16 18:51:18 -0500 |
| commit | 9863c28a2af90a56c088f5f6288d7f6d2c923c14 (patch) | |
| tree | 8c78c0eec82bcb7f1c2fd616c3a3c5f25f508588 /arch/powerpc/kernel/traps.c | |
| parent | c58ce397a62ec14b7b06c407a4173ed667e20d5f (diff) | |
| download | linux-9863c28a2af90a56c088f5f6288d7f6d2c923c14.tar.bz2 | |
powerpc: Emulate sync instruction variants
Reserved fields of the sync instruction have been used for other
instructions (e.g. lwsync). On processors that do not support variants
of the sync instruction, emulate it by executing a sync to subsume the
effect of the intended instruction.
Signed-off-by: James Yang <James.Yang@freescale.com>
[scottwood@freescale.com: whitespace and subject line fix]
Signed-off-by: Scott Wood <scottwood@freescale.com>
Diffstat (limited to 'arch/powerpc/kernel/traps.c')
| -rw-r--r-- | arch/powerpc/kernel/traps.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c index f0a6814007a5..36a1f95a2a36 100644 --- a/arch/powerpc/kernel/traps.c +++ b/arch/powerpc/kernel/traps.c @@ -1018,6 +1018,13 @@ static int emulate_instruction(struct pt_regs *regs) return emulate_isel(regs, instword); } + /* Emulate sync instruction variants */ + if ((instword & PPC_INST_SYNC_MASK) == PPC_INST_SYNC) { + PPC_WARN_EMULATED(sync, regs); + asm volatile("sync"); + return 0; + } + #ifdef CONFIG_PPC64 /* Emulate the mfspr rD, DSCR. */ if ((((instword & PPC_INST_MFSPR_DSCR_USER_MASK) == |