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-rw-r--r--arch/ia64/kernel/minstate.h46
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, , )
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