xtensa: add fixup for double exception raised in window overflow

There are two FIXMEs in the double exception handler 'for the extremely
unlikely case'. This case gets hit by gcc during kernel build once in
a few hours, resulting in an unrecoverable exception condition.

Provide missing fixup routine to handle this case. Double exception
literals now need 8 more bytes, add them to the linker script.

Also replace bbsi instructions with bbsi.l as we're branching depending
on 8th and 7th LSB-based bits of exception address.

This may be tested by adding the explicit DTLB invalidation to window
overflow handlers, like the following:

    --- a/arch/xtensa/kernel/vectors.S
    +++ b/arch/xtensa/kernel/vectors.S
    @@ -592,6 +592,14 @@ ENDPROC(_WindowUnderflow4)
     ENTRY_ALIGN64(_WindowOverflow8)

    	s32e	a0, a9, -16
    +	bbsi.l	a9, 31, 1f
    +	rsr	a0, ccount
    +	bbsi.l	a0, 4, 1f
    +	pdtlb	a0, a9
    +	idtlb	a0
    +	movi	a0, 9
    +	idtlb	a0
    +1:
    	l32e    a0, a1, -12
    	s32e    a2, a9,  -8
    	s32e    a1, a9, -12

Cc: stable@vger.kernel.org
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

2 files changed, 138 insertions, 24 deletions

diff --git a/arch/xtensa/kernel/vectors.S b/arch/xtensa/kernel/vectors.S
index f9e1ec346e35..8453e6e39895 100644
--- a/arch/xtensa/kernel/vectors.S
+++ b/arch/xtensa/kernel/vectors.S
@@ -376,38 +376,42 @@ _DoubleExceptionVector_WindowOverflow:
         beqz    a2, 1f          # if at start of vector, don't restore
 
         addi    a0, a0, -128
-        bbsi    a0, 8, 1f       # don't restore except for overflow 8 and 12
-        bbsi    a0, 7, 2f
+        bbsi.l  a0, 8, 1f       # don't restore except for overflow 8 and 12
+
+        /*
+         * This fixup handler is for the extremely unlikely case where the
+         * overflow handler's reference thru a0 gets a hardware TLB refill
+         * that bumps out the (distinct, aliasing) TLB entry that mapped its
+         * prior references thru a9/a13, and where our reference now thru
+         * a9/a13 gets a 2nd-level miss exception (not hardware TLB refill).
+         */
+        movi    a2, window_overflow_restore_a0_fixup
+        s32i    a2, a3, EXC_TABLE_FIXUP
+        l32i    a2, a3, EXC_TABLE_DOUBLE_SAVE
+        xsr     a3, excsave1
+
+        bbsi.l  a0, 7, 2f
 
         /*
          * Restore a0 as saved by _WindowOverflow8().
-         *
-         * FIXME:  we really need a fixup handler for this L32E,
-         * for the extremely unlikely case where the overflow handler's
-         * reference thru a0 gets a hardware TLB refill that bumps out
-         * the (distinct, aliasing) TLB entry that mapped its prior
-         * references thru a9, and where our reference now thru a9
-         * gets a 2nd-level miss exception (not hardware TLB refill).
          */
 
-        l32e    a2, a9, -16
-        wsr     a2, depc        # replace the saved a0
-        j       1f
+        l32e    a0, a9, -16
+        wsr     a0, depc        # replace the saved a0
+        j       3f
 
 2:
         /*
          * Restore a0 as saved by _WindowOverflow12().
-         *
-         * FIXME:  we really need a fixup handler for this L32E,
-         * for the extremely unlikely case where the overflow handler's
-         * reference thru a0 gets a hardware TLB refill that bumps out
-         * the (distinct, aliasing) TLB entry that mapped its prior
-         * references thru a13, and where our reference now thru a13
-         * gets a 2nd-level miss exception (not hardware TLB refill).
          */
 
-        l32e    a2, a13, -16
-        wsr     a2, depc        # replace the saved a0
+        l32e    a0, a13, -16
+        wsr     a0, depc        # replace the saved a0
+3:
+        xsr     a3, excsave1
+        movi    a0, 0
+        s32i    a0, a3, EXC_TABLE_FIXUP
+        s32i    a2, a3, EXC_TABLE_DOUBLE_SAVE
 1:
         /*
          * Restore WindowBase while leaving all address registers restored.
@@ -449,6 +453,7 @@ _DoubleExceptionVector_WindowOverflow:
 
         s32i    a0, a2, PT_DEPC
 
+_DoubleExceptionVector_handle_exception:
         addx4   a0, a0, a3
         l32i    a0, a0, EXC_TABLE_FAST_USER
         xsr     a3, excsave1
@@ -464,11 +469,120 @@ _DoubleExceptionVector_WindowOverflow:
         rotw    -3
         j       1b
 
-        .end literal_prefix
 
 ENDPROC(_DoubleExceptionVector)
 
 /*
+ * Fixup handler for TLB miss in double exception handler for window owerflow.
+ * We get here with windowbase set to the window that was being spilled and
+ * a0 trashed. a0 bit 7 determines if this is a call8 (bit clear) or call12
+ * (bit set) window.
+ *
+ * We do the following here:
+ * - go to the original window retaining a0 value;
+ * - set up exception stack to return back to appropriate a0 restore code
+ *   (we'll need to rotate window back and there's no place to save this
+ *    information, use different return address for that);
+ * - handle the exception;
+ * - go to the window that was being spilled;
+ * - set up window_overflow_restore_a0_fixup as a fixup routine;
+ * - reload a0;
+ * - restore the original window;
+ * - reset the default fixup routine;
+ * - return to user. By the time we get to this fixup handler all information
+ *   about the conditions of the original double exception that happened in
+ *   the window overflow handler is lost, so we just return to userspace to
+ *   retry overflow from start.
+ *
+ * a0: value of depc, original value in depc
+ * a2: trashed, original value in EXC_TABLE_DOUBLE_SAVE
+ * a3: exctable, original value in excsave1
+ */
+
+ENTRY(window_overflow_restore_a0_fixup)
+
+        rsr     a0, ps
+        extui   a0, a0, PS_OWB_SHIFT, PS_OWB_WIDTH
+        rsr     a2, windowbase
+        sub     a0, a2, a0
+        extui   a0, a0, 0, 3
+        l32i    a2, a3, EXC_TABLE_DOUBLE_SAVE
+        xsr     a3, excsave1
+
+        _beqi   a0, 1, .Lhandle_1
+        _beqi   a0, 3, .Lhandle_3
+
+        .macro  overflow_fixup_handle_exception_pane n
+
+        rsr     a0, depc
+        rotw    -\n
+
+        xsr     a3, excsave1
+        wsr     a2, depc
+        l32i    a2, a3, EXC_TABLE_KSTK
+        s32i    a0, a2, PT_AREG0
+
+        movi    a0, .Lrestore_\n
+        s32i    a0, a2, PT_DEPC
+        rsr     a0, exccause
+        j       _DoubleExceptionVector_handle_exception
+
+        .endm
+
+        overflow_fixup_handle_exception_pane 2
+.Lhandle_1:
+        overflow_fixup_handle_exception_pane 1
+.Lhandle_3:
+        overflow_fixup_handle_exception_pane 3
+
+        .macro  overflow_fixup_restore_a0_pane n
+
+        rotw    \n
+        /* Need to preserve a0 value here to be able to handle exception
+         * that may occur on a0 reload from stack. It may occur because
+         * TLB miss handler may not be atomic and pointer to page table
+         * may be lost before we get here. There are no free registers,
+         * so we need to use EXC_TABLE_DOUBLE_SAVE area.
+         */
+        xsr     a3, excsave1
+        s32i    a2, a3, EXC_TABLE_DOUBLE_SAVE
+        movi    a2, window_overflow_restore_a0_fixup
+        s32i    a2, a3, EXC_TABLE_FIXUP
+        l32i    a2, a3, EXC_TABLE_DOUBLE_SAVE
+        xsr     a3, excsave1
+        bbsi.l  a0, 7, 1f
+        l32e    a0, a9, -16
+        j       2f
+1:
+        l32e    a0, a13, -16
+2:
+        rotw    -\n
+
+        .endm
+
+.Lrestore_2:
+        overflow_fixup_restore_a0_pane 2
+
+.Lset_default_fixup:
+        xsr     a3, excsave1
+        s32i    a2, a3, EXC_TABLE_DOUBLE_SAVE
+        movi    a2, 0
+        s32i    a2, a3, EXC_TABLE_FIXUP
+        l32i    a2, a3, EXC_TABLE_DOUBLE_SAVE
+        xsr     a3, excsave1
+        rfe
+
+.Lrestore_1:
+        overflow_fixup_restore_a0_pane 1
+        j       .Lset_default_fixup
+.Lrestore_3:
+        overflow_fixup_restore_a0_pane 3
+        j       .Lset_default_fixup
+
+ENDPROC(window_overflow_restore_a0_fixup)
+
+        .end literal_prefix
+/*
  * Debug interrupt vector
  *
  * There is not much space here, so simply jump to another handler.
diff --git a/arch/xtensa/kernel/vmlinux.lds.S b/arch/xtensa/kernel/vmlinux.lds.S
index ee32c0085dff..d16db6df86f8 100644
--- a/arch/xtensa/kernel/vmlinux.lds.S
+++ b/arch/xtensa/kernel/vmlinux.lds.S
@@ -269,13 +269,13 @@ SECTIONS
                   .UserExceptionVector.literal)
   SECTION_VECTOR (_DoubleExceptionVector_literal,
                   .DoubleExceptionVector.literal,
-                  DOUBLEEXC_VECTOR_VADDR - 16,
+                  DOUBLEEXC_VECTOR_VADDR - 40,
                   SIZEOF(.UserExceptionVector.text),
                   .UserExceptionVector.text)
   SECTION_VECTOR (_DoubleExceptionVector_text,
                   .DoubleExceptionVector.text,
                   DOUBLEEXC_VECTOR_VADDR,
-                  32,
+                  40,
                   .DoubleExceptionVector.literal)
 
   . = (LOADADDR( .DoubleExceptionVector.text ) + SIZEOF( .DoubleExceptionVector.text ) + 3) & ~ 3;