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+/*
+ * arch/xtensa/kernel/vectors.S
+ *
+ * This file contains all exception vectors (user, kernel, and double),
+ * as well as the window vectors (overflow and underflow), and the debug
+ * vector. These are the primary vectors executed by the processor if an
+ * exception occurs.
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file "COPYING" in the main directory of
+ * this archive for more details.
+ *
+ * Copyright (C) 2005 - 2008 Tensilica, Inc.
+ *
+ * Chris Zankel <chris@zankel.net>
+ *
+ */
+
+/*
+ * We use a two-level table approach. The user and kernel exception vectors
+ * use a first-level dispatch table to dispatch the exception to a registered
+ * fast handler or the default handler, if no fast handler was registered.
+ * The default handler sets up a C-stack and dispatches the exception to a
+ * registerd C handler in the second-level dispatch table.
+ *
+ * Fast handler entry condition:
+ *
+ * a0: trashed, original value saved on stack (PT_AREG0)
+ * a1: a1
+ * a2: new stack pointer, original value in depc
+ * a3: dispatch table
+ * depc: a2, original value saved on stack (PT_DEPC)
+ * excsave_1: a3
+ *
+ * The value for PT_DEPC saved to stack also functions as a boolean to
+ * indicate that the exception is either a double or a regular exception:
+ *
+ * PT_DEPC >= VALID_DOUBLE_EXCEPTION_ADDRESS: double exception
+ * < VALID_DOUBLE_EXCEPTION_ADDRESS: regular exception
+ *
+ * Note: Neither the kernel nor the user exception handler generate literals.
+ *
+ */
+
+#include <linux/linkage.h>
+#include <asm/ptrace.h>
+#include <asm/current.h>
+#include <asm/asm-offsets.h>
+#include <asm/pgtable.h>
+#include <asm/processor.h>
+#include <asm/page.h>
+#include <asm/thread_info.h>
+#include <asm/vectors.h>
+
+#define WINDOW_VECTORS_SIZE 0x180
+
+
+/*
+ * User exception vector. (Exceptions with PS.UM == 1, PS.EXCM == 0)
+ *
+ * We get here when an exception occurred while we were in userland.
+ * We switch to the kernel stack and jump to the first level handler
+ * associated to the exception cause.
+ *
+ * Note: the saved kernel stack pointer (EXC_TABLE_KSTK) is already
+ * decremented by PT_USER_SIZE.
+ */
+
+ .section .UserExceptionVector.text, "ax"
+
+ENTRY(_UserExceptionVector)
+
+ xsr a3, excsave1 # save a3 and get dispatch table
+ wsr a2, depc # save a2
+ l32i a2, a3, EXC_TABLE_KSTK # load kernel stack to a2
+ s32i a0, a2, PT_AREG0 # save a0 to ESF
+ rsr a0, exccause # retrieve exception cause
+ s32i a0, a2, PT_DEPC # mark it as a regular exception
+ addx4 a0, a0, a3 # find entry in table
+ l32i a0, a0, EXC_TABLE_FAST_USER # load handler
+ xsr a3, excsave1 # restore a3 and dispatch table
+ jx a0
+
+ENDPROC(_UserExceptionVector)
+
+/*
+ * Kernel exception vector. (Exceptions with PS.UM == 0, PS.EXCM == 0)
+ *
+ * We get this exception when we were already in kernel space.
+ * We decrement the current stack pointer (kernel) by PT_SIZE and
+ * jump to the first-level handler associated with the exception cause.
+ *
+ * Note: we need to preserve space for the spill region.
+ */
+
+ .section .KernelExceptionVector.text, "ax"
+
+ENTRY(_KernelExceptionVector)
+
+ xsr a3, excsave1 # save a3, and get dispatch table
+ wsr a2, depc # save a2
+ addi a2, a1, -16-PT_SIZE # adjust stack pointer
+ s32i a0, a2, PT_AREG0 # save a0 to ESF
+ rsr a0, exccause # retrieve exception cause
+ s32i a0, a2, PT_DEPC # mark it as a regular exception
+ addx4 a0, a0, a3 # find entry in table
+ l32i a0, a0, EXC_TABLE_FAST_KERNEL # load handler address
+ xsr a3, excsave1 # restore a3 and dispatch table
+ jx a0
+
+ENDPROC(_KernelExceptionVector)
+
+/*
+ * Double exception vector (Exceptions with PS.EXCM == 1)
+ * We get this exception when another exception occurs while were are
+ * already in an exception, such as window overflow/underflow exception,
+ * or 'expected' exceptions, for example memory exception when we were trying
+ * to read data from an invalid address in user space.
+ *
+ * Note that this vector is never invoked for level-1 interrupts, because such
+ * interrupts are disabled (masked) when PS.EXCM is set.
+ *
+ * We decode the exception and take the appropriate action. However, the
+ * double exception vector is much more careful, because a lot more error
+ * cases go through the double exception vector than through the user and
+ * kernel exception vectors.
+ *
+ * Occasionally, the kernel expects a double exception to occur. This usually
+ * happens when accessing user-space memory with the user's permissions
+ * (l32e/s32e instructions). The kernel state, though, is not always suitable
+ * for immediate transfer of control to handle_double, where "normal" exception
+ * processing occurs. Also in kernel mode, TLB misses can occur if accessing
+ * vmalloc memory, possibly requiring repair in a double exception handler.
+ *
+ * The variable at TABLE_FIXUP offset from the pointer in EXCSAVE_1 doubles as
+ * a boolean variable and a pointer to a fixup routine. If the variable
+ * EXC_TABLE_FIXUP is non-zero, this handler jumps to that address. A value of
+ * zero indicates to use the default kernel/user exception handler.
+ * There is only one exception, when the value is identical to the exc_table
+ * label, the kernel is in trouble. This mechanism is used to protect critical
+ * sections, mainly when the handler writes to the stack to assert the stack
+ * pointer is valid. Once the fixup/default handler leaves that area, the
+ * EXC_TABLE_FIXUP variable is reset to the fixup handler or zero.
+ *
+ * Procedures wishing to use this mechanism should set EXC_TABLE_FIXUP to the
+ * nonzero address of a fixup routine before it could cause a double exception
+ * and reset it before it returns.
+ *
+ * Some other things to take care of when a fast exception handler doesn't
+ * specify a particular fixup handler but wants to use the default handlers:
+ *
+ * - The original stack pointer (in a1) must not be modified. The fast
+ * exception handler should only use a2 as the stack pointer.
+ *
+ * - If the fast handler manipulates the stack pointer (in a2), it has to
+ * register a valid fixup handler and cannot use the default handlers.
+ *
+ * - The handler can use any other generic register from a3 to a15, but it
+ * must save the content of these registers to stack (PT_AREG3...PT_AREGx)
+ *
+ * - These registers must be saved before a double exception can occur.
+ *
+ * - If we ever implement handling signals while in double exceptions, the
+ * number of registers a fast handler has saved (excluding a0 and a1) must
+ * be written to PT_AREG1. (1 if only a3 is used, 2 for a3 and a4, etc. )
+ *
+ * The fixup handlers are special handlers:
+ *
+ * - Fixup entry conditions differ from regular exceptions:
+ *
+ * a0: DEPC
+ * a1: a1
+ * a2: trashed, original value in EXC_TABLE_DOUBLE_SAVE
+ * a3: exctable
+ * depc: a0
+ * excsave_1: a3
+ *
+ * - When the kernel enters the fixup handler, it still assumes it is in a
+ * critical section, so EXC_TABLE_FIXUP variable is set to exc_table.
+ * The fixup handler, therefore, has to re-register itself as the fixup
+ * handler before it returns from the double exception.
+ *
+ * - Fixup handler can share the same exception frame with the fast handler.
+ * The kernel stack pointer is not changed when entering the fixup handler.
+ *
+ * - Fixup handlers can jump to the default kernel and user exception
+ * handlers. Before it jumps, though, it has to setup a exception frame
+ * on stack. Because the default handler resets the register fixup handler
+ * the fixup handler must make sure that the default handler returns to
+ * it instead of the exception address, so it can re-register itself as
+ * the fixup handler.
+ *
+ * In case of a critical condition where the kernel cannot recover, we jump
+ * to unrecoverable_exception with the following entry conditions.
+ * All registers a0...a15 are unchanged from the last exception, except:
+ *
+ * a0: last address before we jumped to the unrecoverable_exception.
+ * excsave_1: a0
+ *
+ *
+ * See the handle_alloca_user and spill_registers routines for example clients.
+ *
+ * FIXME: Note: we currently don't allow signal handling coming from a double
+ * exception, so the item markt with (*) is not required.
+ */
+
+ .section .DoubleExceptionVector.text, "ax"
+ .begin literal_prefix .DoubleExceptionVector
+ .globl _DoubleExceptionVector_WindowUnderflow
+ .globl _DoubleExceptionVector_WindowOverflow
+
+ENTRY(_DoubleExceptionVector)
+
+ xsr a3, excsave1
+ s32i a2, a3, EXC_TABLE_DOUBLE_SAVE
+
+ /* Check for kernel double exception (usually fatal). */
+
+ rsr a2, ps
+ _bbci.l a2, PS_UM_BIT, .Lksp
+
+ /* Check if we are currently handling a window exception. */
+ /* Note: We don't need to indicate that we enter a critical section. */
+
+ xsr a0, depc # get DEPC, save a0
+
+ movi a2, WINDOW_VECTORS_VADDR
+ _bltu a0, a2, .Lfixup
+ addi a2, a2, WINDOW_VECTORS_SIZE
+ _bgeu a0, a2, .Lfixup
+
+ /* Window overflow/underflow exception. Get stack pointer. */
+
+ l32i a2, a3, EXC_TABLE_KSTK
+
+ /* Check for overflow/underflow exception, jump if overflow. */
+
+ bbci.l a0, 6, _DoubleExceptionVector_WindowOverflow
+
+ /*
+ * Restart window underflow exception.
+ * Currently:
+ * depc = orig a0,
+ * a0 = orig DEPC,
+ * a2 = new sp based on KSTK from exc_table
+ * a3 = excsave_1
+ * excsave_1 = orig a3
+ *
+ * We return to the instruction in user space that caused the window
+ * underflow exception. Therefore, we change window base to the value
+ * before we entered the window underflow exception and prepare the
+ * registers to return as if we were coming from a regular exception
+ * by changing depc (in a0).
+ * Note: We can trash the current window frame (a0...a3) and depc!
+ */
+_DoubleExceptionVector_WindowUnderflow:
+ xsr a3, excsave1
+ wsr a2, depc # save stack pointer temporarily
+ rsr a0, ps
+ extui a0, a0, PS_OWB_SHIFT, PS_OWB_WIDTH
+ wsr a0, windowbase
+ rsync
+
+ /* We are now in the previous window frame. Save registers again. */
+
+ xsr a2, depc # save a2 and get stack pointer
+ s32i a0, a2, PT_AREG0
+ xsr a3, excsave1
+ rsr a0, exccause
+ s32i a0, a2, PT_DEPC # mark it as a regular exception
+ addx4 a0, a0, a3
+ xsr a3, excsave1
+ l32i a0, a0, EXC_TABLE_FAST_USER
+ jx a0
+
+ /*
+ * We only allow the ITLB miss exception if we are in kernel space.
+ * All other exceptions are unexpected and thus unrecoverable!
+ */
+
+#ifdef CONFIG_MMU
+ .extern fast_second_level_miss_double_kernel
+
+.Lksp: /* a0: a0, a1: a1, a2: a2, a3: trashed, depc: depc, excsave: a3 */
+
+ rsr a3, exccause
+ beqi a3, EXCCAUSE_ITLB_MISS, 1f
+ addi a3, a3, -EXCCAUSE_DTLB_MISS
+ bnez a3, .Lunrecoverable
+1: movi a3, fast_second_level_miss_double_kernel
+ jx a3
+#else
+.equ .Lksp, .Lunrecoverable
+#endif
+
+ /* Critical! We can't handle this situation. PANIC! */
+
+ .extern unrecoverable_exception
+
+.Lunrecoverable_fixup:
+ l32i a2, a3, EXC_TABLE_DOUBLE_SAVE
+ xsr a0, depc
+
+.Lunrecoverable:
+ rsr a3, excsave1
+ wsr a0, excsave1
+ movi a0, unrecoverable_exception
+ callx0 a0
+
+.Lfixup:/* Check for a fixup handler or if we were in a critical section. */
+
+ /* a0: depc, a1: a1, a2: trash, a3: exctable, depc: a0, excsave1: a3 */
+
+ /* Enter critical section. */
+
+ l32i a2, a3, EXC_TABLE_FIXUP
+ s32i a3, a3, EXC_TABLE_FIXUP
+ beq a2, a3, .Lunrecoverable_fixup # critical section
+ beqz a2, .Ldflt # no handler was registered
+
+ /* a0: depc, a1: a1, a2: trash, a3: exctable, depc: a0, excsave: a3 */
+
+ jx a2
+
+.Ldflt: /* Get stack pointer. */
+
+ l32i a2, a3, EXC_TABLE_DOUBLE_SAVE
+ addi a2, a2, -PT_USER_SIZE
+
+ /* a0: depc, a1: a1, a2: kstk, a3: exctable, depc: a0, excsave: a3 */
+
+ s32i a0, a2, PT_DEPC
+ l32i a0, a3, EXC_TABLE_DOUBLE_SAVE
+ xsr a0, depc
+ s32i a0, a2, PT_AREG0
+
+ /* a0: avail, a1: a1, a2: kstk, a3: exctable, depc: a2, excsave: a3 */
+
+ rsr a0, exccause
+ addx4 a0, a0, a3
+ xsr a3, excsave1
+ l32i a0, a0, EXC_TABLE_FAST_USER
+ jx a0
+
+ /*
+ * Restart window OVERFLOW exception.
+ * Currently:
+ * depc = orig a0,
+ * a0 = orig DEPC,
+ * a2 = new sp based on KSTK from exc_table
+ * a3 = EXCSAVE_1
+ * excsave_1 = orig a3
+ *
+ * We return to the instruction in user space that caused the window
+ * overflow exception. Therefore, we change window base to the value
+ * before we entered the window overflow exception and prepare the
+ * registers to return as if we were coming from a regular exception
+ * by changing DEPC (in a0).
+ *
+ * NOTE: We CANNOT trash the current window frame (a0...a3), but we
+ * can clobber depc.
+ *
+ * The tricky part here is that overflow8 and overflow12 handlers
+ * save a0, then clobber a0. To restart the handler, we have to restore
+ * a0 if the double exception was past the point where a0 was clobbered.
+ *
+ * To keep things simple, we take advantage of the fact all overflow
+ * handlers save a0 in their very first instruction. If DEPC was past
+ * that instruction, we can safely restore a0 from where it was saved
+ * on the stack.
+ *
+ * a0: depc, a1: a1, a2: kstk, a3: exc_table, depc: a0, excsave1: a3
+ */
+_DoubleExceptionVector_WindowOverflow:
+ extui a2, a0, 0, 6 # get offset into 64-byte vector handler
+ beqz a2, 1f # if at start of vector, don't restore
+
+ addi a0, a0, -128
+ 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().
+ */
+
+ l32e a0, a9, -16
+ wsr a0, depc # replace the saved a0
+ j 3f
+
+2:
+ /*
+ * Restore a0 as saved by _WindowOverflow12().
+ */
+
+ 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.
+ * We have to use ROTW for this, because WSR.WINDOWBASE requires
+ * an address register (which would prevent restore).
+ *
+ * Window Base goes from 0 ... 7 (Module 8)
+ * Window Start is 8 bits; Ex: (0b1010 1010):0x55 from series of call4s
+ */
+
+ 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, .L1pane
+ beqi a0, 3, .L3pane
+
+ rsr a0, depc
+ rotw -2
+
+ /*
+ * We are now in the user code's original window frame.
+ * Process the exception as a user exception as if it was
+ * taken by the user code.
+ *
+ * This is similar to the user exception vector,
+ * except that PT_DEPC isn't set to EXCCAUSE.
+ */
+1:
+ xsr a3, excsave1
+ wsr a2, depc
+ l32i a2, a3, EXC_TABLE_KSTK
+ s32i a0, a2, PT_AREG0
+ rsr a0, exccause
+
+ s32i a0, a2, PT_DEPC
+
+_DoubleExceptionVector_handle_exception:
+ addi a0, a0, -EXCCAUSE_UNALIGNED
+ beqz a0, 2f
+ addx4 a0, a0, a3
+ l32i a0, a0, EXC_TABLE_FAST_USER + 4 * EXCCAUSE_UNALIGNED
+ xsr a3, excsave1
+ jx a0
+2:
+ movi a0, user_exception
+ xsr a3, excsave1
+ jx a0
+
+.L1pane:
+ rsr a0, depc
+ rotw -1
+ j 1b
+
+.L3pane:
+ rsr a0, depc
+ rotw -3
+ j 1b
+
+
+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.
+ * EXCSAVE[DEBUGLEVEL] has been set to that handler.
+ */
+
+ .section .DebugInterruptVector.text, "ax"
+
+ENTRY(_DebugInterruptVector)
+
+ xsr a0, SREG_EXCSAVE + XCHAL_DEBUGLEVEL
+ jx a0
+
+ENDPROC(_DebugInterruptVector)
+
+
+
+/*
+ * Medium priority level interrupt vectors
+ *
+ * Each takes less than 16 (0x10) bytes, no literals, by placing
+ * the extra 8 bytes that would otherwise be required in the window
+ * vectors area where there is space. With relocatable vectors,
+ * all vectors are within ~ 4 kB range of each other, so we can
+ * simply jump (J) to another vector without having to use JX.
+ *
+ * common_exception code gets current IRQ level in PS.INTLEVEL
+ * and preserves it for the IRQ handling time.
+ */
+
+ .macro irq_entry_level level
+
+ .if XCHAL_EXCM_LEVEL >= \level
+ .section .Level\level\()InterruptVector.text, "ax"
+ENTRY(_Level\level\()InterruptVector)
+ wsr a0, excsave2
+ rsr a0, epc\level
+ wsr a0, epc1
+ movi a0, EXCCAUSE_LEVEL1_INTERRUPT
+ wsr a0, exccause
+ rsr a0, eps\level
+ # branch to user or kernel vector
+ j _SimulateUserKernelVectorException
+ .endif
+
+ .endm
+
+ irq_entry_level 2
+ irq_entry_level 3
+ irq_entry_level 4
+ irq_entry_level 5
+ irq_entry_level 6
+
+
+/* Window overflow and underflow handlers.
+ * The handlers must be 64 bytes apart, first starting with the underflow
+ * handlers underflow-4 to underflow-12, then the overflow handlers
+ * overflow-4 to overflow-12.
+ *
+ * Note: We rerun the underflow handlers if we hit an exception, so
+ * we try to access any page that would cause a page fault early.
+ */
+
+#define ENTRY_ALIGN64(name) \
+ .globl name; \
+ .align 64; \
+ name:
+
+ .section .WindowVectors.text, "ax"
+
+
+/* 4-Register Window Overflow Vector (Handler) */
+
+ENTRY_ALIGN64(_WindowOverflow4)
+
+ s32e a0, a5, -16
+ s32e a1, a5, -12
+ s32e a2, a5, -8
+ s32e a3, a5, -4
+ rfwo
+
+ENDPROC(_WindowOverflow4)
+
+
+#if XCHAL_EXCM_LEVEL >= 2
+ /* Not a window vector - but a convenient location
+ * (where we know there's space) for continuation of
+ * medium priority interrupt dispatch code.
+ * On entry here, a0 contains PS, and EPC2 contains saved a0:
+ */
+ .align 4
+_SimulateUserKernelVectorException:
+ addi a0, a0, (1 << PS_EXCM_BIT)
+ wsr a0, ps
+ bbsi.l a0, PS_UM_BIT, 1f # branch if user mode
+ rsr a0, excsave2 # restore a0
+ j _KernelExceptionVector # simulate kernel vector exception
+1: rsr a0, excsave2 # restore a0
+ j _UserExceptionVector # simulate user vector exception
+#endif
+
+
+/* 4-Register Window Underflow Vector (Handler) */
+
+ENTRY_ALIGN64(_WindowUnderflow4)
+
+ l32e a0, a5, -16
+ l32e a1, a5, -12
+ l32e a2, a5, -8
+ l32e a3, a5, -4
+ rfwu
+
+ENDPROC(_WindowUnderflow4)
+
+/* 8-Register Window Overflow Vector (Handler) */
+
+ENTRY_ALIGN64(_WindowOverflow8)
+
+ s32e a0, a9, -16
+ l32e a0, a1, -12
+ s32e a2, a9, -8
+ s32e a1, a9, -12
+ s32e a3, a9, -4
+ s32e a4, a0, -32
+ s32e a5, a0, -28
+ s32e a6, a0, -24
+ s32e a7, a0, -20
+ rfwo
+
+ENDPROC(_WindowOverflow8)
+
+/* 8-Register Window Underflow Vector (Handler) */
+
+ENTRY_ALIGN64(_WindowUnderflow8)
+
+ l32e a1, a9, -12
+ l32e a0, a9, -16
+ l32e a7, a1, -12
+ l32e a2, a9, -8
+ l32e a4, a7, -32
+ l32e a3, a9, -4
+ l32e a5, a7, -28
+ l32e a6, a7, -24
+ l32e a7, a7, -20
+ rfwu
+
+ENDPROC(_WindowUnderflow8)
+
+/* 12-Register Window Overflow Vector (Handler) */
+
+ENTRY_ALIGN64(_WindowOverflow12)
+
+ s32e a0, a13, -16
+ l32e a0, a1, -12
+ s32e a1, a13, -12
+ s32e a2, a13, -8
+ s32e a3, a13, -4
+ s32e a4, a0, -48
+ s32e a5, a0, -44
+ s32e a6, a0, -40
+ s32e a7, a0, -36
+ s32e a8, a0, -32
+ s32e a9, a0, -28
+ s32e a10, a0, -24
+ s32e a11, a0, -20
+ rfwo
+
+ENDPROC(_WindowOverflow12)
+
+/* 12-Register Window Underflow Vector (Handler) */
+
+ENTRY_ALIGN64(_WindowUnderflow12)
+
+ l32e a1, a13, -12
+ l32e a0, a13, -16
+ l32e a11, a1, -12
+ l32e a2, a13, -8
+ l32e a4, a11, -48
+ l32e a8, a11, -32
+ l32e a3, a13, -4
+ l32e a5, a11, -44
+ l32e a6, a11, -40
+ l32e a7, a11, -36
+ l32e a9, a11, -28
+ l32e a10, a11, -24
+ l32e a11, a11, -20
+ rfwu
+
+ENDPROC(_WindowUnderflow12)
+
+ .text