1 files changed, 29 insertions, 0 deletions

diff --git a/arch/sparc/kernel/utrap.S b/arch/sparc/kernel/utrap.S
new file mode 100644
index 00000000000..b7f0f3f3a90
--- /dev/null
+++ b/arch/sparc/kernel/utrap.S
@@ -0,0 +1,29 @@
+        .globl          utrap_trap
+        .type           utrap_trap,#function
+utrap_trap:             /* %g3=handler,%g4=level */
+        TRAP_LOAD_THREAD_REG(%g6, %g1)
+        ldx             [%g6 + TI_UTRAPS], %g1
+        brnz,pt         %g1, invoke_utrap
+         nop
+
+        ba,pt           %xcc, etrap
+         rd             %pc, %g7
+        mov             %l4, %o1
+        call            bad_trap
+         add            %sp, PTREGS_OFF, %o0
+        ba,pt           %xcc, rtrap
+         nop
+
+invoke_utrap:
+        sllx            %g3, 3, %g3
+        ldx             [%g1 + %g3], %g1
+        save            %sp, -128, %sp
+        rdpr            %tstate, %l6
+        rdpr            %cwp, %l7
+        andn            %l6, TSTATE_CWP, %l6
+        wrpr            %l6, %l7, %tstate
+        rdpr            %tpc, %l6
+        rdpr            %tnpc, %l7
+        wrpr            %g1, 0, %tnpc
+        done
+        .size           utrap_trap,.-utrap_trap