[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>

1 files changed, 7 insertions, 0 deletions

diff --git a/include/asm-powerpc/processor.h b/include/asm-powerpc/processor.h
index fa6163268153..d2c2c95f913b 100644
--- a/include/asm-powerpc/processor.h
+++ b/include/asm-powerpc/processor.h
@@ -149,6 +149,7 @@ struct thread_struct {
                 unsigned int val;       /* Floating point status */
         } fpscr;
         int             fpexc_mode;     /* floating-point exception mode */
+        unsigned int    align_ctl;      /* alignment handling control */
 #ifdef CONFIG_PPC64
         unsigned long   start_tb;       /* Start purr when proc switched in */
         unsigned long   accum_tb;       /* Total accumilated purr for process */
@@ -217,6 +218,12 @@ extern int set_fpexc_mode(struct task_struct *tsk, unsigned int val);
 extern int get_endian(struct task_struct *tsk, unsigned long adr);
 extern int set_endian(struct task_struct *tsk, unsigned int val);
 
+#define GET_UNALIGN_CTL(tsk, adr)       get_unalign_ctl((tsk), (adr))
+#define SET_UNALIGN_CTL(tsk, val)       set_unalign_ctl((tsk), (val))
+
+extern int get_unalign_ctl(struct task_struct *tsk, unsigned long adr);
+extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val);
+
 static inline unsigned int __unpack_fe01(unsigned long msr_bits)
 {
         return ((msr_bits & MSR_FE0) >> 10) | ((msr_bits & MSR_FE1) >> 8);