diff options
| author | Nicholas Piggin <npiggin@gmail.com> | 2018-10-12 16:15:16 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-10-14 10:04:09 +0300 |
| commit | 4c2de74cc8696154b283f241d74ec0bb24438e22 (patch) | |
| tree | 85fe4333599db98756971f364ef4beb654abc162 /arch/powerpc/include/asm/ptrace.h | |
| parent | 3eeacd9f4ea33546f272fcf131d6a11edbe3b4a6 (diff) | |
| download | linux-4c2de74cc8696154b283f241d74ec0bb24438e22.tar.xz | |
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/include/asm/ptrace.h')
| -rw-r--r-- | arch/powerpc/include/asm/ptrace.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/ptrace.h b/arch/powerpc/include/asm/ptrace.h index 3dd15024db93..2ba2a1e52291 100644 --- a/arch/powerpc/include/asm/ptrace.h +++ b/arch/powerpc/include/asm/ptrace.h @@ -51,6 +51,10 @@ struct pt_regs unsigned long result; }; }; + +#ifdef CONFIG_PPC64 + unsigned long ppr; +#endif }; #endif |