diff options
| author | Nicholas Piggin <npiggin@gmail.com> | 2018-10-12 15:15:16 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-10-14 09:04:09 +0200 |
| commit | 4c2de74cc8696154b283f241d74ec0bb24438e22 (patch) | |
| tree | 85fe4333599db98756971f364ef4beb654abc162 /arch/powerpc/kernel/ptrace.c | |
| parent | powerpc/ptrace: Don't use sizeof(struct pt_regs) in ptrace code (diff) | |
| download | linux-4c2de74cc8696154b283f241d74ec0bb24438e22.tar.xz linux-4c2de74cc8696154b283f241d74ec0bb24438e22.zip | |
powerpc/64: Interrupts save PPR on stack rather than thread_struct
PPR is the odd register out when it comes to interrupt handling, it is
saved in current->thread.ppr while all others are saved on the stack.
The difficulty with this is that accessing thread.ppr can cause a SLB
fault, but the SLB fault handler implementation in C change had
assumed the normal exception entry handlers would not cause an SLB
fault.
Fix this by allocating room in the interrupt stack to save PPR.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
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 | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c index c7d0d0c1e34d..afb819f4ca68 100644 --- a/arch/powerpc/kernel/ptrace.c +++ b/arch/powerpc/kernel/ptrace.c @@ -1609,7 +1609,7 @@ static int ppr_get(struct task_struct *target, void *kbuf, void __user *ubuf) { return user_regset_copyout(&pos, &count, &kbuf, &ubuf, - &target->thread.ppr, 0, sizeof(u64)); + &target->thread.regs->ppr, 0, sizeof(u64)); } static int ppr_set(struct task_struct *target, @@ -1618,7 +1618,7 @@ static int ppr_set(struct task_struct *target, const void *kbuf, const void __user *ubuf) { return user_regset_copyin(&pos, &count, &kbuf, &ubuf, - &target->thread.ppr, 0, sizeof(u64)); + &target->thread.regs->ppr, 0, sizeof(u64)); } static int dscr_get(struct task_struct *target, |