1 files changed, 42 insertions, 4 deletions

diff --git a/arch/ia64/kernel/minstate.h b/arch/ia64/kernel/minstate.h
index 7c548ac52bbc..74b6d670aaef 100644
--- a/arch/ia64/kernel/minstate.h
+++ b/arch/ia64/kernel/minstate.h
@@ -15,6 +15,9 @@
 #define ACCOUNT_SYS_ENTER
 #endif
 
+.section ".data.patch.rse", "a"
+.previous
+
 /*
  * DO_SAVE_MIN switches to the kernel stacks (if necessary) and saves
  * the minimum state necessary that allows us to turn psr.ic back
@@ -40,7 +43,7 @@
  * Note that psr.ic is NOT turned on by this macro.  This is so that
  * we can pass interruption state as arguments to a handler.
  */
-#define DO_SAVE_MIN(COVER,SAVE_IFS,EXTRA)                                                       \
+#define DO_SAVE_MIN(COVER,SAVE_IFS,EXTRA,WORKAROUND)                                            \
         mov r16=IA64_KR(CURRENT);       /* M */                                                 \
         mov r27=ar.rsc;                 /* M */                                                 \
         mov r20=r1;                     /* A */                                                 \
@@ -87,6 +90,7 @@
         tbit.nz p15,p0=r29,IA64_PSR_I_BIT;                                                      \
         mov r29=b0                                                                              \
         ;;                                                                                      \
+        WORKAROUND;                                                                             \
         adds r16=PT(R8),r1;     /* initialize first base pointer */                             \
         adds r17=PT(R9),r1;     /* initialize second base pointer */                            \
 (pKStk) mov r18=r0;             /* make sure r18 isn't NaT */                                   \
@@ -206,6 +210,40 @@
         st8 [r25]=r10;          /* ar.ssd */    \
         ;;
 
-#define SAVE_MIN_WITH_COVER     DO_SAVE_MIN(cover, mov r30=cr.ifs,)
-#define SAVE_MIN_WITH_COVER_R19 DO_SAVE_MIN(cover, mov r30=cr.ifs, mov r15=r19)
-#define SAVE_MIN                DO_SAVE_MIN(     , mov r30=r0, )
+#define RSE_WORKAROUND                          \
+(pUStk) extr.u r17=r18,3,6;                     \
+(pUStk) sub r16=r18,r22;                        \
+[1:](pKStk)     br.cond.sptk.many 1f;           \
+        .xdata4 ".data.patch.rse",1b-.          \
+        ;;                                      \
+        cmp.ge p6,p7 = 33,r17;                  \
+        ;;                                      \
+(p6)    mov r17=0x310;                          \
+(p7)    mov r17=0x308;                          \
+        ;;                                      \
+        cmp.leu p1,p0=r16,r17;                  \
+(p1)    br.cond.sptk.many 1f;                   \
+        dep.z r17=r26,0,62;                     \
+        movl r16=2f;                            \
+        ;;                                      \
+        mov ar.pfs=r17;                         \
+        dep r27=r0,r27,16,14;                   \
+        mov b0=r16;                             \
+        ;;                                      \
+        br.ret.sptk b0;                         \
+        ;;                                      \
+2:                                              \
+        mov ar.rsc=r0                           \
+        ;;                                      \
+        flushrs;                                \
+        ;;                                      \
+        mov ar.bspstore=r22                     \
+        ;;                                      \
+        mov r18=ar.bsp;                         \
+        ;;                                      \
+1:                                              \
+        .pred.rel "mutex", pKStk, pUStk
+
+#define SAVE_MIN_WITH_COVER     DO_SAVE_MIN(cover, mov r30=cr.ifs, , RSE_WORKAROUND)
+#define SAVE_MIN_WITH_COVER_R19 DO_SAVE_MIN(cover, mov r30=cr.ifs, mov r15=r19, RSE_WORKAROUND)
+#define SAVE_MIN                        DO_SAVE_MIN(     , mov r30=r0, , )