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#

# Copyright (C) 2005 Jakub Jermar

# All rights reserved.

#

# Redistribution and use in source and binary forms, with or without

# modification, are permitted provided that the following conditions

# are met:

#

# - Redistributions of source code must retain the above copyright

#   notice, this list of conditions and the following disclaimer.

# - Redistributions in binary form must reproduce the above copyright

#   notice, this list of conditions and the following disclaimer in the

#   documentation and/or other materials provided with the distribution.

# - The name of the author may not be used to endorse or promote products

#   derived from this software without specific prior written permission.

#

# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#

/**

 * @file

 * @brief This file contains kernel trap table.

 */

.register %g2, #scratch

.register %g3, #scratch

.text

#include <arch/trap/trap_table.h>

#include <arch/trap/regwin.h>

#include <arch/trap/interrupt.h>

#include <arch/trap/exception.h>

#include <arch/trap/syscall.h>

#include <arch/trap/mmu.h>

#include <arch/mm/mmu.h>

#include <arch/mm/page.h>

#include <arch/stack.h>

#include <arch/regdef.h>

#define TABLE_SIZE	TRAP_TABLE_SIZE

#define ENTRY_SIZE	TRAP_TABLE_ENTRY_SIZE

/*

 * Kernel trap table.

 */

.align TABLE_SIZE

.global trap_table

trap_table:

/* TT = 0x08, TL = 0, instruction_access_exception */

.org trap_table + TT_INSTRUCTION_ACCESS_EXCEPTION*ENTRY_SIZE

.global instruction_access_exception

instruction_access_exception:

	PREEMPTIBLE_HANDLER do_instruction_access_exc

/* TT = 0x10, TL = 0, illegal_instruction */

.org trap_table + TT_ILLEGAL_INSTRUCTION*ENTRY_SIZE

.global illegal_instruction

illegal_instruction:

	PREEMPTIBLE_HANDLER do_illegal_instruction

/* TT = 0x24, TL = 0, clean_window handler */

.org trap_table + TT_CLEAN_WINDOW*ENTRY_SIZE

.global clean_window_handler

clean_window_handler:

	CLEAN_WINDOW_HANDLER

/* TT = 0x32, TL = 0, data_access_error */

.org trap_table + TT_DATA_ACCESS_ERROR*ENTRY_SIZE

.global data_access_error

data_access_error:

	PREEMPTIBLE_HANDLER do_data_access_error

/* TT = 0x34, TL = 0, mem_address_not_aligned */

.org trap_table + TT_MEM_ADDRESS_NOT_ALIGNED*ENTRY_SIZE

.global mem_address_not_aligned

mem_address_not_aligned:

	MEM_ADDRESS_NOT_ALIGNED_HANDLER

/* TT = 0x41, TL = 0, interrupt_level_1 handler */

.org trap_table + TT_INTERRUPT_LEVEL_1*ENTRY_SIZE

.global interrupt_level_1_handler

interrupt_level_1_handler:

	INTERRUPT_LEVEL_N_HANDLER 1

/* TT = 0x42, TL = 0, interrupt_level_2 handler */

.org trap_table + TT_INTERRUPT_LEVEL_2*ENTRY_SIZE

.global interrupt_level_2_handler

interrupt_level_2_handler:

	INTERRUPT_LEVEL_N_HANDLER 2

/* TT = 0x43, TL = 0, interrupt_level_3 handler */

.org trap_table + TT_INTERRUPT_LEVEL_3*ENTRY_SIZE

.global interrupt_level_3_handler

interrupt_level_3_handler:

	INTERRUPT_LEVEL_N_HANDLER 3

/* TT = 0x44, TL = 0, interrupt_level_4 handler */

.org trap_table + TT_INTERRUPT_LEVEL_4*ENTRY_SIZE

.global interrupt_level_4_handler

interrupt_level_4_handler:

	INTERRUPT_LEVEL_N_HANDLER 4

/* TT = 0x45, TL = 0, interrupt_level_5 handler */

.org trap_table + TT_INTERRUPT_LEVEL_5*ENTRY_SIZE

.global interrupt_level_5_handler

interrupt_level_5_handler:

	INTERRUPT_LEVEL_N_HANDLER 5

/* TT = 0x46, TL = 0, interrupt_level_6 handler */

.org trap_table + TT_INTERRUPT_LEVEL_6*ENTRY_SIZE

.global interrupt_level_6_handler

interrupt_level_6_handler:

	INTERRUPT_LEVEL_N_HANDLER 6

/* TT = 0x47, TL = 0, interrupt_level_7 handler */

.org trap_table + TT_INTERRUPT_LEVEL_7*ENTRY_SIZE

.global interrupt_level_7_handler

interrupt_level_7_handler:

	INTERRUPT_LEVEL_N_HANDLER 7

/* TT = 0x48, TL = 0, interrupt_level_8 handler */

.org trap_table + TT_INTERRUPT_LEVEL_8*ENTRY_SIZE

.global interrupt_level_8_handler

interrupt_level_8_handler:

	INTERRUPT_LEVEL_N_HANDLER 8

/* TT = 0x49, TL = 0, interrupt_level_9 handler */

.org trap_table + TT_INTERRUPT_LEVEL_9*ENTRY_SIZE

.global interrupt_level_9_handler

interrupt_level_9_handler:

	INTERRUPT_LEVEL_N_HANDLER 9

/* TT = 0x4a, TL = 0, interrupt_level_10 handler */

.org trap_table + TT_INTERRUPT_LEVEL_10*ENTRY_SIZE

.global interrupt_level_10_handler

interrupt_level_10_handler:

	INTERRUPT_LEVEL_N_HANDLER 10

/* TT = 0x4b, TL = 0, interrupt_level_11 handler */

.org trap_table + TT_INTERRUPT_LEVEL_11*ENTRY_SIZE

.global interrupt_level_11_handler

interrupt_level_11_handler:

	INTERRUPT_LEVEL_N_HANDLER 11

/* TT = 0x4c, TL = 0, interrupt_level_12 handler */

.org trap_table + TT_INTERRUPT_LEVEL_12*ENTRY_SIZE

.global interrupt_level_12_handler

interrupt_level_12_handler:

	INTERRUPT_LEVEL_N_HANDLER 12

/* TT = 0x4d, TL = 0, interrupt_level_13 handler */

.org trap_table + TT_INTERRUPT_LEVEL_13*ENTRY_SIZE

.global interrupt_level_13_handler

interrupt_level_13_handler:

	INTERRUPT_LEVEL_N_HANDLER 13

/* TT = 0x4e, TL = 0, interrupt_level_14 handler */

.org trap_table + TT_INTERRUPT_LEVEL_14*ENTRY_SIZE

.global interrupt_level_14_handler

interrupt_level_14_handler:

	INTERRUPT_LEVEL_N_HANDLER 14

/* TT = 0x4f, TL = 0, interrupt_level_15 handler */

.org trap_table + TT_INTERRUPT_LEVEL_15*ENTRY_SIZE

.global interrupt_level_15_handler

interrupt_level_15_handler:

	INTERRUPT_LEVEL_N_HANDLER 15

/* TT = 0x60, TL = 0, interrupt_vector_trap handler */

.org trap_table + TT_INTERRUPT_VECTOR_TRAP*ENTRY_SIZE

.global interrupt_vector_trap_handler

interrupt_vector_trap_handler:

	INTERRUPT_VECTOR_TRAP_HANDLER

/* TT = 0x64, TL = 0, fast_instruction_access_MMU_miss */

.org trap_table + TT_FAST_INSTRUCTION_ACCESS_MMU_MISS*ENTRY_SIZE

.global fast_instruction_access_mmu_miss_handler

fast_instruction_access_mmu_miss_handler:

	FAST_INSTRUCTION_ACCESS_MMU_MISS_HANDLER

/* TT = 0x68, TL = 0, fast_data_access_MMU_miss */

.org trap_table + TT_FAST_DATA_ACCESS_MMU_MISS*ENTRY_SIZE

.global fast_data_access_mmu_miss_handler

fast_data_access_mmu_miss_handler:

	FAST_DATA_ACCESS_MMU_MISS_HANDLER

/* TT = 0x6c, TL = 0, fast_data_access_protection */

.org trap_table + TT_FAST_DATA_ACCESS_PROTECTION*ENTRY_SIZE

.global fast_data_access_protection_handler

fast_data_access_protection_handler:

	FAST_DATA_ACCESS_PROTECTION_HANDLER

/* TT = 0x80, TL = 0, spill_0_normal handler */

.org trap_table + TT_SPILL_0_NORMAL*ENTRY_SIZE

.global spill_0_normal

spill_0_normal:

	SPILL_NORMAL_HANDLER_KERNEL

/* TT = 0x84, TL = 0, spill_1_normal handler */

.org trap_table + TT_SPILL_1_NORMAL*ENTRY_SIZE

.global spill_1_normal

spill_1_normal:

	SPILL_NORMAL_HANDLER_USERSPACE

/* TT = 0x88, TL = 0, spill_2_normal handler */

.org trap_table + TT_SPILL_2_NORMAL*ENTRY_SIZE

.global spill_2_normal

spill_2_normal:

	SPILL_TO_USPACE_WINDOW_BUFFER

/* TT = 0xa0, TL = 0, spill_0_other handler */

.org trap_table + TT_SPILL_0_OTHER*ENTRY_SIZE

.global spill_0_other

spill_0_other:

	SPILL_TO_USPACE_WINDOW_BUFFER

/* TT = 0xc0, TL = 0, fill_0_normal handler */

.org trap_table + TT_FILL_0_NORMAL*ENTRY_SIZE

.global fill_0_normal

fill_0_normal:

	FILL_NORMAL_HANDLER_KERNEL

/* TT = 0xc4, TL = 0, fill_1_normal handler */

.org trap_table + TT_FILL_1_NORMAL*ENTRY_SIZE

.global fill_1_normal

fill_1_normal:

	FILL_NORMAL_HANDLER_USERSPACE

/* TT = 0x100, TL = 0, trap_instruction_0 */

.org trap_table + TT_TRAP_INSTRUCTION(0)*ENTRY_SIZE

.global trap_instruction_0

trap_instruction_0:

	TRAP_INSTRUCTION 0

/* TT = 0x101, TL = 0, trap_instruction_1 */

.org trap_table + TT_TRAP_INSTRUCTION(1)*ENTRY_SIZE

.global trap_instruction_1

trap_instruction_1:

	TRAP_INSTRUCTION 1

/* TT = 0x102, TL = 0, trap_instruction_2 */

.org trap_table + TT_TRAP_INSTRUCTION(2)*ENTRY_SIZE

.global trap_instruction_2

trap_instruction_2:

	TRAP_INSTRUCTION 2

/* TT = 0x103, TL = 0, trap_instruction_3 */

.org trap_table + TT_TRAP_INSTRUCTION(3)*ENTRY_SIZE

.global trap_instruction_3

trap_instruction_3:

	TRAP_INSTRUCTION 3

/* TT = 0x104, TL = 0, trap_instruction_4 */

.org trap_table + TT_TRAP_INSTRUCTION(4)*ENTRY_SIZE

.global trap_instruction_4

trap_instruction_4:

	TRAP_INSTRUCTION 4

/* TT = 0x105, TL = 0, trap_instruction_5 */

.org trap_table + TT_TRAP_INSTRUCTION(5)*ENTRY_SIZE

.global trap_instruction_5

trap_instruction_5:

	TRAP_INSTRUCTION 5

/* TT = 0x106, TL = 0, trap_instruction_6 */

.org trap_table + TT_TRAP_INSTRUCTION(6)*ENTRY_SIZE

.global trap_instruction_6

trap_instruction_6:

	TRAP_INSTRUCTION 6

/* TT = 0x107, TL = 0, trap_instruction_7 */

.org trap_table + TT_TRAP_INSTRUCTION(7)*ENTRY_SIZE

.global trap_instruction_7

trap_instruction_7:

	TRAP_INSTRUCTION 7

/* TT = 0x108, TL = 0, trap_instruction_8 */

.org trap_table + TT_TRAP_INSTRUCTION(8)*ENTRY_SIZE

.global trap_instruction_8

trap_instruction_8:

	TRAP_INSTRUCTION 8

/* TT = 0x109, TL = 0, trap_instruction_9 */

.org trap_table + TT_TRAP_INSTRUCTION(9)*ENTRY_SIZE

.global trap_instruction_9

trap_instruction_9:

	TRAP_INSTRUCTION 9

/* TT = 0x10a, TL = 0, trap_instruction_10 */

.org trap_table + TT_TRAP_INSTRUCTION(10)*ENTRY_SIZE

.global trap_instruction_10

trap_instruction_10:

	TRAP_INSTRUCTION 10

/* TT = 0x10b, TL = 0, trap_instruction_11 */

.org trap_table + TT_TRAP_INSTRUCTION(11)*ENTRY_SIZE

.global trap_instruction_11

trap_instruction_11:

	TRAP_INSTRUCTION 11

/* TT = 0x10c, TL = 0, trap_instruction_12 */

.org trap_table + TT_TRAP_INSTRUCTION(12)*ENTRY_SIZE

.global trap_instruction_12

trap_instruction_12:

	TRAP_INSTRUCTION 12

/* TT = 0x10d, TL = 0, trap_instruction_13 */

.org trap_table + TT_TRAP_INSTRUCTION(13)*ENTRY_SIZE

.global trap_instruction_13

trap_instruction_13:

	TRAP_INSTRUCTION 13

/* TT = 0x10e, TL = 0, trap_instruction_14 */

.org trap_table + TT_TRAP_INSTRUCTION(14)*ENTRY_SIZE

.global trap_instruction_14

trap_instruction_14:

	TRAP_INSTRUCTION 14

/* TT = 0x10f, TL = 0, trap_instruction_15 */

.org trap_table + TT_TRAP_INSTRUCTION(15)*ENTRY_SIZE

.global trap_instruction_15

trap_instruction_15:

	TRAP_INSTRUCTION 15

/* TT = 0x110, TL = 0, trap_instruction_16 */

.org trap_table + TT_TRAP_INSTRUCTION(16)*ENTRY_SIZE

.global trap_instruction_16

trap_instruction_16:

	TRAP_INSTRUCTION 16

/* TT = 0x111, TL = 0, trap_instruction_17 */

.org trap_table + TT_TRAP_INSTRUCTION(17)*ENTRY_SIZE

.global trap_instruction_17

trap_instruction_17:

	TRAP_INSTRUCTION 17

/* TT = 0x112, TL = 0, trap_instruction_18 */

.org trap_table + TT_TRAP_INSTRUCTION(18)*ENTRY_SIZE

.global trap_instruction_18

trap_instruction_18:

	TRAP_INSTRUCTION 18

/* TT = 0x113, TL = 0, trap_instruction_19 */

.org trap_table + TT_TRAP_INSTRUCTION(19)*ENTRY_SIZE

.global trap_instruction_19

trap_instruction_19:

	TRAP_INSTRUCTION 19

/* TT = 0x114, TL = 0, trap_instruction_20 */

.org trap_table + TT_TRAP_INSTRUCTION(20)*ENTRY_SIZE

.global trap_instruction_20

trap_instruction_20:

	TRAP_INSTRUCTION 20

/* TT = 0x115, TL = 0, trap_instruction_21 */

.org trap_table + TT_TRAP_INSTRUCTION(21)*ENTRY_SIZE

.global trap_instruction_21

trap_instruction_21:

	TRAP_INSTRUCTION 21

/* TT = 0x116, TL = 0, trap_instruction_22 */

.org trap_table + TT_TRAP_INSTRUCTION(22)*ENTRY_SIZE

.global trap_instruction_22

trap_instruction_22:

	TRAP_INSTRUCTION 22

/* TT = 0x117, TL = 0, trap_instruction_23 */

.org trap_table + TT_TRAP_INSTRUCTION(23)*ENTRY_SIZE

.global trap_instruction_23

trap_instruction_23:

	TRAP_INSTRUCTION 23

/* TT = 0x118, TL = 0, trap_instruction_24 */

.org trap_table + TT_TRAP_INSTRUCTION(24)*ENTRY_SIZE

.global trap_instruction_24

trap_instruction_24:

	TRAP_INSTRUCTION 24

/* TT = 0x119, TL = 0, trap_instruction_25 */

.org trap_table + TT_TRAP_INSTRUCTION(25)*ENTRY_SIZE

.global trap_instruction_25

trap_instruction_25:

	TRAP_INSTRUCTION 25

/* TT = 0x11a, TL = 0, trap_instruction_26 */

.org trap_table + TT_TRAP_INSTRUCTION(26)*ENTRY_SIZE

.global trap_instruction_26

trap_instruction_26:

	TRAP_INSTRUCTION 26

/* TT = 0x11b, TL = 0, trap_instruction_27 */

.org trap_table + TT_TRAP_INSTRUCTION(27)*ENTRY_SIZE

.global trap_instruction_27

trap_instruction_27:

	TRAP_INSTRUCTION 27

/* TT = 0x11c, TL = 0, trap_instruction_28 */

.org trap_table + TT_TRAP_INSTRUCTION(28)*ENTRY_SIZE

.global trap_instruction_28

trap_instruction_28:

	TRAP_INSTRUCTION 28

/* TT = 0x11d, TL = 0, trap_instruction_29 */

.org trap_table + TT_TRAP_INSTRUCTION(29)*ENTRY_SIZE

.global trap_instruction_29

trap_instruction_29:

	TRAP_INSTRUCTION 29

/* TT = 0x11e, TL = 0, trap_instruction_30 */

.org trap_table + TT_TRAP_INSTRUCTION(30)*ENTRY_SIZE

.global trap_instruction_30

trap_instruction_30:

	TRAP_INSTRUCTION 30

/* TT = 0x11f, TL = 0, trap_instruction_31 */

.org trap_table + TT_TRAP_INSTRUCTION(31)*ENTRY_SIZE

.global trap_instruction_31

trap_instruction_31:

	TRAP_INSTRUCTION 31

/*

 * Handlers for TL>0.

 */

/* TT = 0x08, TL > 0, instruction_access_exception */

.org trap_table + (TT_INSTRUCTION_ACCESS_EXCEPTION+512)*ENTRY_SIZE

.global instruction_access_exception_high

instruction_access_exception_high:

	PREEMPTIBLE_HANDLER do_instruction_access_exc

/* TT = 0x10, TL > 0, illegal_instruction */

.org trap_table + (TT_ILLEGAL_INSTRUCTION+512)*ENTRY_SIZE

.global illegal_instruction_high

illegal_instruction_high:

	PREEMPTIBLE_HANDLER do_illegal_instruction

/* TT = 0x24, TL > 0, clean_window handler */

.org trap_table + (TT_CLEAN_WINDOW+512)*ENTRY_SIZE

.global clean_window_handler_high

clean_window_handler_high:

	CLEAN_WINDOW_HANDLER

/* TT = 0x32, TL > 0, data_access_error */

.org trap_table + (TT_DATA_ACCESS_ERROR+512)*ENTRY_SIZE

.global data_access_error_high

data_access_error_high:

	PREEMPTIBLE_HANDLER do_data_access_error

/* TT = 0x34, TL > 0, mem_address_not_aligned */

.org trap_table + (TT_MEM_ADDRESS_NOT_ALIGNED+512)*ENTRY_SIZE

.global mem_address_not_aligned_high

mem_address_not_aligned_high:

	MEM_ADDRESS_NOT_ALIGNED_HANDLER

/* TT = 0x64, TL > 0, fast_instruction_access_MMU_miss */

.org trap_table + (TT_FAST_INSTRUCTION_ACCESS_MMU_MISS+512)*ENTRY_SIZE

.global fast_instruction_access_mmu_miss_handler_high

fast_instruction_access_mmu_miss_handler_high:

	FAST_INSTRUCTION_ACCESS_MMU_MISS_HANDLER

/* TT = 0x68, TL > 0, fast_data_access_MMU_miss */

.org trap_table + (TT_FAST_DATA_ACCESS_MMU_MISS+512)*ENTRY_SIZE

.global fast_data_access_mmu_miss_handler_high

fast_data_access_mmu_miss_handler_high:

	FAST_DATA_ACCESS_MMU_MISS_HANDLER

/* TT = 0x6c, TL > 0, fast_data_access_protection */

.org trap_table + (TT_FAST_DATA_ACCESS_PROTECTION+512)*ENTRY_SIZE

.global fast_data_access_protection_handler_high

fast_data_access_protection_handler_high:

	FAST_DATA_ACCESS_PROTECTION_HANDLER

/* TT = 0x80, TL > 0, spill_0_normal handler */

.org trap_table + (TT_SPILL_0_NORMAL+512)*ENTRY_SIZE

.global spill_0_normal_high

spill_0_normal_high:

	SPILL_NORMAL_HANDLER_KERNEL

/* TT = 0x88, TL > 0, spill_2_normal handler */

.org trap_table + (TT_SPILL_2_NORMAL+512)*ENTRY_SIZE

.global spill_2_normal_high

spill_2_normal_high:

	SPILL_TO_USPACE_WINDOW_BUFFER

/* TT = 0xa0, TL > 0, spill_0_other handler */

.org trap_table + (TT_SPILL_0_OTHER+512)*ENTRY_SIZE

.global spill_0_other_high

spill_0_other_high:

	SPILL_TO_USPACE_WINDOW_BUFFER

/* TT = 0xc0, TL > 0, fill_0_normal handler */

.org trap_table + (TT_FILL_0_NORMAL+512)*ENTRY_SIZE

.global fill_0_normal_high

fill_0_normal_high:

	FILL_NORMAL_HANDLER_KERNEL

#define NOT(x)	((x) == 0)

/* Preemptible trap handler for TL=1.

 *

 * This trap handler makes arrangements to make calling of scheduler() from

 * within a trap context possible. It is called from several other trap

 * handlers.

 *

 * This function can be entered either with interrupt globals or alternate globals.

 * Memory management trap handlers are obliged to switch to one of those global sets

 * prior to calling this function. Register window management functions are not

 * allowed to modify the alternate global registers.

 *

 * Input registers:

 *	%g1		Address of function to call.

 * 	%g2	 	First argument for the function.

 *	%g6		Pre-set as kernel stack base if trap from userspace.

 *	%g7		Pre-set as address of the userspace window buffer.

 */

.macro PREEMPTIBLE_HANDLER_TEMPLATE is_syscall

	/*

	 * ASSERT(%tl == 1)

	 */

	rdpr %tl, %g3

	cmp %g3, 1

	be 1f

	nop

0:	ba 0b					! this for debugging, if we ever get here

	nop					! it will be easy to find

1:

.if NOT(\is_syscall)

	rdpr %tstate, %g3

	andcc %g3, TSTATE_PRIV_BIT, %g0		! if this trap came from the privileged mode...

	bnz 0f					! ...skip setting of kernel stack and primary context

	nop

.endif

	/*

	 * Normal window spills will go to the userspace window buffer.

	 */

	wrpr %g0, WSTATE_OTHER(0) | WSTATE_NORMAL(2), %wstate

	wrpr %g0, NWINDOW - 1, %cleanwin	! prevent unnecessary clean_window exceptions

	/*

	 * Switch to kernel stack. The old stack is

	 * automatically saved in the old window's %sp

	 * and the new window's %fp.

	 */

	save %g6, -PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE, %sp

.if \is_syscall

	/*

	 * Copy arguments for the syscall to the new window.

	 */

	mov %i0, %o2

	mov %i1, %o3

	mov %i2, %o4

	mov %i3, %o5

.endif

	/*

	 * Mark the CANRESTORE windows as OTHER windows.

	 */

	rdpr %canrestore, %l0

	wrpr %l0, %otherwin

	wrpr %g0, %canrestore

	/*

	 * Switch to primary context 0.

	 */

	mov VA_PRIMARY_CONTEXT_REG, %l0

	stxa %g0, [%l0] ASI_DMMU

	rd %pc, %l0

	flush %l0

.if NOT(\is_syscall)

	ba 1f

	nop

0:

	save %sp, -PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE, %sp

	/*

	 * At this moment, we are using the kernel stack 

	 * and have successfully allocated a register window.

	 */

1:

.endif

	/*

	 * Other window spills will go to the userspace window buffer

	 * and normal spills will go to the kernel stack.

	 */

	wrpr %g0, WSTATE_OTHER(0) | WSTATE_NORMAL(0), %wstate

	/*

	 * Copy arguments.

	 */

	mov %g1, %l0

	mov %g2, %o0

	/*

	 * Save TSTATE, TPC and TNPC aside.

	 */

	rdpr %tstate, %g1

	rdpr %tpc, %g2

	rdpr %tnpc, %g3

	/*

	 * The following memory accesses will not fault

	 * because special provisions are made to have

	 * the kernel stack of THREAD locked in DTLB.

	 */

	stx %g1, [%sp + PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE + STACK_BIAS + SAVED_TSTATE]

	stx %g2, [%sp + PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE + STACK_BIAS + SAVED_TPC]

	stx %g3, [%sp + PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE + STACK_BIAS + SAVED_TNPC]

	wrpr %g0, 0, %tl

	wrpr %g0, PSTATE_PRIV_BIT, %pstate

	SAVE_GLOBALS

	/*

	 * Call the higher-level handler and pass istate as second parameter.

	 */

	call %l0

	add %sp, PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE + STACK_BIAS + SAVED_TNPC, %o1

.if \is_syscall

	/*

	 * Copy the value returned by the syscall.

	 */

	mov %o0, %i0

.endif

	RESTORE_GLOBALS

	wrpr %g0, PSTATE_AG_BIT | PSTATE_PRIV_BIT, %pstate

	wrpr %g0, 1, %tl

	/*

	 * Read TSTATE, TPC and TNPC from saved copy.

	 */

	ldx [%sp + PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE + STACK_BIAS + SAVED_TSTATE], %g1

	ldx [%sp + PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE + STACK_BIAS + SAVED_TPC], %g2

	ldx [%sp + PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE + STACK_BIAS + SAVED_TNPC], %g3

	/*

	 * Restore TSTATE, TPC and TNPC from saved copies.

	 */

	wrpr %g1, 0, %tstate

	wrpr %g2, 0, %tpc

	wrpr %g3, 0, %tnpc

	/*

	 * If OTHERWIN is zero, then all the userspace windows have been

	 * spilled to kernel memory (i.e. register window buffer). Moreover,

	 * if the scheduler was called in the meantime, all valid windows

	 * belonging to other threads were spilled by context_restore().

	 * If OTHERWIN is non-zero, then some userspace windows are still

	 * valid. Others might have been spilled. However, the CWP pointer

	 * needs no fixing because the scheduler had not been called.

	 */

	rdpr %otherwin, %l0

	brnz %l0, 0f

	nop

	/*

	 * OTHERWIN == 0

	 */

	/*

	 * If TSTATE.CWP + 1 == CWP, then we still do not have to fix CWP.

	 */

	and %g1, TSTATE_CWP_MASK, %l0

	inc %l0

	and %l0, NWINDOW - 1, %l0	! %l0 mod NWINDOW

	rdpr %cwp, %l1

	cmp %l0, %l1

	bz 0f				! CWP is ok

	nop

	/*

	 * Fix CWP.

	 * In order to recapitulate, the input registers in the current

	 * window are the output registers of the window to which we want

	 * to restore. Because the fill trap fills only input and local

	 * registers of a window, we need to preserve those output

	 * registers manually.

	 */

	mov %sp, %g2

	stx %i0, [%sp + PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE + STACK_BIAS + SAVED_I0]

	stx %i1, [%sp + PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE + STACK_BIAS + SAVED_I1]

	stx %i2, [%sp + PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE + STACK_BIAS + SAVED_I2]

	stx %i3, [%sp + PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE + STACK_BIAS + SAVED_I3]

	stx %i4, [%sp + PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE + STACK_BIAS + SAVED_I4]

	stx %i5, [%sp + PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE + STACK_BIAS + SAVED_I5]

	stx %i6, [%sp + PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE + STACK_BIAS + SAVED_I6]

	stx %i7, [%sp + PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE + STACK_BIAS + SAVED_I7]

	wrpr %l0, 0, %cwp

	mov %g2, %sp

	ldx [%sp + PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE + STACK_BIAS + SAVED_I0], %i0

	ldx [%sp + PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE + STACK_BIAS + SAVED_I1], %i1

	ldx [%sp + PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE + STACK_BIAS + SAVED_I2], %i2

	ldx [%sp + PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE + STACK_BIAS + SAVED_I3], %i3

	ldx [%sp + PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE + STACK_BIAS + SAVED_I4], %i4

	ldx [%sp + PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE + STACK_BIAS + SAVED_I5], %i5

	ldx [%sp + PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE + STACK_BIAS + SAVED_I6], %i6

	ldx [%sp + PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE + STACK_BIAS + SAVED_I7], %i7

	/*

	 * OTHERWIN != 0 or fall-through from the OTHERWIN == 0 case.

	 * The CWP has already been restored to the value it had prior to the SAVE

	 * at the beginning of this function.

	 */

0:

.if NOT(\is_syscall)

	rdpr %tstate, %g1

	andcc %g1, TSTATE_PRIV_BIT, %g0		! if we are not returning to userspace...,

	bnz 1f					! ...skip restoring userspace windows

	nop

.endif

	/*

	 * Spills and fills will be processed by the {spill,fill}_1_normal

	 * handlers.

	 */

	wrpr %g0, WSTATE_OTHER(0) | WSTATE_NORMAL(1), %wstate

	/*

	 * Set primary context according to secondary context.

	 */

	wr %g0, ASI_DMMU, %asi

	ldxa [VA_SECONDARY_CONTEXT_REG] %asi, %g1

	stxa %g1, [VA_PRIMARY_CONTEXT_REG] %asi

	rd %pc, %g1

	flush %g1

	rdpr %cwp, %g1

	rdpr %otherwin, %g2

	/*

	 * Skip all OTHERWIN windows and descend to the first window

	 * in the userspace window buffer.

	 */

	sub %g1, %g2, %g3

	dec %g3

	and %g3, NWINDOW - 1, %g3

	wrpr %g3, 0, %cwp

	/*

	 * CWP is now in the window last saved in the userspace window buffer.

	 * Fill all windows stored in the buffer.

	 */

	clr %g4

	set PAGE_SIZE - 1, %g5

0:	andcc %g7, %g5, %g0			! PAGE_SIZE alignment check

	bz 0f					! %g7 is page-aligned, no more windows to refill

	nop

	add %g7, -STACK_WINDOW_SAVE_AREA_SIZE, %g7

	ldx [%g7 + L0_OFFSET], %l0

	ldx [%g7 + L1_OFFSET], %l1

	ldx [%g7 + L2_OFFSET], %l2

	ldx [%g7 + L3_OFFSET], %l3

	ldx [%g7 + L4_OFFSET], %l4

	ldx [%g7 + L5_OFFSET], %l5

	ldx [%g7 + L6_OFFSET], %l6

	ldx [%g7 + L7_OFFSET], %l7

	ldx [%g7 + I0_OFFSET], %i0

	ldx [%g7 + I1_OFFSET], %i1

	ldx [%g7 + I2_OFFSET], %i2

	ldx [%g7 + I3_OFFSET], %i3

	ldx [%g7 + I4_OFFSET], %i4

	ldx [%g7 + I5_OFFSET], %i5

	ldx [%g7 + I6_OFFSET], %i6

	ldx [%g7 + I7_OFFSET], %i7

	dec %g3

	and %g3, NWINDOW - 1, %g3

	wrpr %g3, 0, %cwp			! switch to the preceeding window

	ba 0b

	inc %g4

0:

	/*

	 * Switch back to the proper current window and adjust

	 * OTHERWIN, CANRESTORE, CANSAVE and CLEANWIN.

	 */

	wrpr %g1, 0, %cwp

	add %g4, %g2, %g2

	cmp %g2, NWINDOW - 2

	bg 2f					! fix the CANRESTORE=NWINDOW-1 anomaly

	mov NWINDOW - 2, %g1			! use dealy slot for both cases

	sub %g1, %g2, %g1

	wrpr %g0, 0, %otherwin

	wrpr %g1, 0, %cansave			! NWINDOW - 2 - CANRESTORE

	wrpr %g2, 0, %canrestore		! OTHERWIN + windows in the buffer

	wrpr %g2, 0, %cleanwin			! avoid information leak

1:

	restore

.if \is_syscall

	done

.else

	retry

.endif

	/*

	 * We got here in order to avoid inconsistency of the window state registers.

	 * If the:

	 *

	 * 	save %g6, -PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE, %sp

	 *

	 * instruction trapped and spilled a register window into the userspace

	 * window buffer, we have just restored NWINDOW - 1 register windows.

	 * However, CANRESTORE can be only NWINDOW - 2 at most.

	 *

	 * The solution is to manually switch to (CWP - 1) mod NWINDOW

	 * and set the window state registers so that:

	 *

	 * 	CANRESTORE 	= NWINDOW - 2

	 *	CLEANWIN	= NWINDOW - 2

	 *	CANSAVE 	= 0

	 *	OTHERWIN	= 0

	 *

	 * The RESTORE isntruction is therfore to be skipped.

	 */

2:

	wrpr %g0, 0, %otherwin

	wrpr %g0, 0, %cansave

	wrpr %g1, 0, %canrestore

	wrpr %g1, 0, %cleanwin

	rdpr %cwp, %g1

	dec %g1

	and %g1, NWINDOW - 1, %g1

	wrpr %g1, 0, %cwp			! CWP--

.if \is_syscall

	done

.else

	retry

.endif

.endm

.global preemptible_handler

preemptible_handler:

	PREEMPTIBLE_HANDLER_TEMPLATE 0

.global trap_instruction_handler

trap_instruction_handler:

	PREEMPTIBLE_HANDLER_TEMPLATE 1