diff options
| author | Paul Mackerras <paulus@samba.org> | 2006-06-07 06:15:39 (GMT) |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2006-06-09 11:24:16 (GMT) |
| commit | e9370ae15dc2f8ba1e1889ce26f13cda565b6ecb (patch) | |
| tree | 338ed732f7a6607bc168795008e244f180876cda /arch | |
| parent | fab5db97e44f76461f76b24adfa8ccb14d4df498 (diff) | |
| download | linux-e9370ae15dc2f8ba1e1889ce26f13cda565b6ecb.tar.xz | |
[PATCH] powerpc: Implement PR_[GS]ET_UNALIGN prctls for powerpc
This gives the ability to control whether alignment exceptions get
fixed up or reported to the process as a SIGBUS, using the existing
PR_SET_UNALIGN and PR_GET_UNALIGN prctls. We do not implement the
option of logging a message on alignment exceptions.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/kernel/process.c | 11 | ||||
| -rw-r--r-- | arch/powerpc/kernel/traps.c | 6 |
2 files changed, 15 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index 2d35d83..e473245 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -752,6 +752,17 @@ int get_endian(struct task_struct *tsk, unsigned long adr) return put_user(val, (unsigned int __user *)adr); } +int set_unalign_ctl(struct task_struct *tsk, unsigned int val) +{ + tsk->thread.align_ctl = val; + return 0; +} + +int get_unalign_ctl(struct task_struct *tsk, unsigned long adr) +{ + return put_user(tsk->thread.align_ctl, (unsigned int __user *)adr); +} + #define TRUNC_PTR(x) ((typeof(x))(((unsigned long)(x)) & 0xffffffff)) int sys_clone(unsigned long clone_flags, unsigned long usp, diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c index 03def57..91a6e04 100644 --- a/arch/powerpc/kernel/traps.c +++ b/arch/powerpc/kernel/traps.c @@ -805,9 +805,11 @@ void __kprobes program_check_exception(struct pt_regs *regs) void alignment_exception(struct pt_regs *regs) { - int fixed; + int fixed = 0; - fixed = fix_alignment(regs); + /* we don't implement logging of alignment exceptions */ + if (!(current->thread.align_ctl & PR_UNALIGN_SIGBUS)) + fixed = fix_alignment(regs); if (fixed == 1) { regs->nip += 4; /* skip over emulated instruction */ |