diff options
| author | Madhavan Srinivasan <maddy@linux.vnet.ibm.com> | 2017-08-20 23:28:24 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-01-19 22:36:54 +1100 |
| commit | a8a4b03ab95f3e99196b0a4dd40804620ea77e74 (patch) | |
| tree | 210d0a819712c7301180bdf862d56f09d41bb12c /arch/powerpc/kernel/ptrace.c | |
| parent | 7a074fc08389f43b448ebef74bf56ba0f6f087d9 (diff) | |
| download | linux-a8a4b03ab95f3e99196b0a4dd40804620ea77e74.tar.bz2 | |
powerpc: Hard wire PT_SOFTE value to 1 in ptrace & signals
We have always had softe in pt_regs, and accessible via PT_SOFTE, even
though it is not userspace state.
The value userspace sees should always be 1, because we should never
be in userspace with interrupts soft disabled.
In a subsequent patch we will be changing the semantics of the kernel
softe value, so hard wire the value to 1 to retain the existing
semantics. As far as we know nothing ever looks at it, but better safe
than sorry.
Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
[mpe: Split out of larger patch, write change log]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kernel/ptrace.c')
| -rw-r--r-- | arch/powerpc/kernel/ptrace.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c index f52ad5bb7109..bd2c49475473 100644 --- a/arch/powerpc/kernel/ptrace.c +++ b/arch/powerpc/kernel/ptrace.c @@ -283,6 +283,18 @@ int ptrace_get_reg(struct task_struct *task, int regno, unsigned long *data) if (regno == PT_DSCR) return get_user_dscr(task, data); +#ifdef CONFIG_PPC64 + /* + * softe copies paca->soft_enabled variable state. Since soft_enabled is + * no more used as a flag, lets force usr to alway see the softe value as 1 + * which means interrupts are not soft disabled. + */ + if (regno == PT_SOFTE) { + *data = 1; + return 0; + } +#endif + if (regno < (sizeof(struct pt_regs) / sizeof(unsigned long))) { *data = ((unsigned long *)task->thread.regs)[regno]; return 0; |