diff options
| author | Liav Rehana <liavr@mellanox.com> | 2017-06-15 11:44:00 +0300 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2017-08-28 15:17:36 -0700 |
| commit | 28923f6b74060b183207a373ddae4ce4948cabea (patch) | |
| tree | c2c393d1e3821cd51942614d94146f2af9601d0e /arch/arc/kernel | |
| parent | 5b2189ab6ee0717babac912f779dcd440e942173 (diff) | |
ARC: [plat-eznps] handle extra aux regs #2: kernel/entry exit
Preserve eflags and gpa1 aux during entry/exit into kernel as these
could be modified by kernel mode
These registers used by compare exchange instructions.
- GPA1 is used for compare value,
- EFLAGS got bit reflects atomic operation response.
EFLAGS is zeroed for each new user task so it won't get its
parent value.
Signed-off-by: Liav Rehana <liavr@mellanox.com>
Signed-off-by: Noam Camus <noamc@ezchip.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc/kernel')
| -rw-r--r-- | arch/arc/kernel/process.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/arc/kernel/process.c b/arch/arc/kernel/process.c index 5c631a111240..5ac3b547453f 100644 --- a/arch/arc/kernel/process.c +++ b/arch/arc/kernel/process.c @@ -234,6 +234,10 @@ void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long usp) */ regs->status32 = STATUS_U_MASK | STATUS_L_MASK | ISA_INIT_STATUS_BITS; +#ifdef CONFIG_EZNPS_MTM_EXT + regs->eflags = 0; +#endif + /* bogus seed values for debugging */ regs->lp_start = 0x10; regs->lp_end = 0x80; |