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#

# Copyright (c) 2005 Jakub Jermar

# Copyright (c) 2008 Pavel Rimsky

# 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/sun4v/mmu.h>

#include <arch/mm/sun4v/mmu.h>

#include <arch/mm/page.h>

#include <arch/stack.h>

#include <arch/sun4v/regdef.h>

#include <arch/sun4v/arch.h>

#include <arch/sun4v/cpu.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_tl0

instruction_access_exception_tl0:

	/*wrpr %g0, PSTATE_AG_BIT | PSTATE_PRIV_BIT, %pstate

	PREEMPTIBLE_HANDLER instruction_access_exception*/

/* TT = 0x0a, TL = 0, instruction_access_error */

.org trap_table + TT_INSTRUCTION_ACCESS_ERROR*ENTRY_SIZE

.global instruction_access_error_tl0

instruction_access_error_tl0:

	PREEMPTIBLE_HANDLER instruction_access_error

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

.org trap_table + TT_ILLEGAL_INSTRUCTION*ENTRY_SIZE

.global illegal_instruction_tl0

illegal_instruction_tl0:

	PREEMPTIBLE_HANDLER illegal_instruction

/* TT = 0x11, TL = 0, privileged_opcode */

.org trap_table + TT_PRIVILEGED_OPCODE*ENTRY_SIZE

.global privileged_opcode_tl0

privileged_opcode_tl0:

	PREEMPTIBLE_HANDLER privileged_opcode

/* TT = 0x12, TL = 0, unimplemented_LDD */

.org trap_table + TT_UNIMPLEMENTED_LDD*ENTRY_SIZE

.global unimplemented_LDD_tl0

unimplemented_LDD_tl0:

	PREEMPTIBLE_HANDLER unimplemented_LDD

/* TT = 0x13, TL = 0, unimplemented_STD */

.org trap_table + TT_UNIMPLEMENTED_STD*ENTRY_SIZE

.global unimplemented_STD_tl0

unimplemented_STD_tl0:

	PREEMPTIBLE_HANDLER unimplemented_STD

/* TT = 0x20, TL = 0, fb_disabled handler */

.org trap_table + TT_FP_DISABLED*ENTRY_SIZE

.global fb_disabled_tl0

fp_disabled_tl0:

	PREEMPTIBLE_HANDLER fp_disabled

/* TT = 0x21, TL = 0, fb_exception_ieee_754 handler */

.org trap_table + TT_FP_EXCEPTION_IEEE_754*ENTRY_SIZE

.global fb_exception_ieee_754_tl0

fp_exception_ieee_754_tl0:

	PREEMPTIBLE_HANDLER fp_exception_ieee_754

/* TT = 0x22, TL = 0, fb_exception_other handler */

.org trap_table + TT_FP_EXCEPTION_OTHER*ENTRY_SIZE

.global fb_exception_other_tl0

fp_exception_other_tl0:

	PREEMPTIBLE_HANDLER fp_exception_other

/* TT = 0x23, TL = 0, tag_overflow */

.org trap_table + TT_TAG_OVERFLOW*ENTRY_SIZE

.global tag_overflow_tl0

tag_overflow_tl0:

	PREEMPTIBLE_HANDLER tag_overflow

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

.org trap_table + TT_CLEAN_WINDOW*ENTRY_SIZE

.global clean_window_tl0

clean_window_tl0:

	CLEAN_WINDOW_HANDLER

/* TT = 0x28, TL = 0, division_by_zero */

.org trap_table + TT_DIVISION_BY_ZERO*ENTRY_SIZE

.global division_by_zero_tl0

division_by_zero_tl0:

	PREEMPTIBLE_HANDLER division_by_zero

/* TT = 0x30, TL = 0, data_access_exception */

.org trap_table + TT_DATA_ACCESS_EXCEPTION*ENTRY_SIZE

.global data_access_exception_tl0

data_access_exception_tl0:

	/*wrpr %g0, PSTATE_AG_BIT | PSTATE_PRIV_BIT, %pstate

	PREEMPTIBLE_HANDLER data_access_exception*/

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

.org trap_table + TT_DATA_ACCESS_ERROR*ENTRY_SIZE

.global data_access_error_tl0

data_access_error_tl0:

	PREEMPTIBLE_HANDLER 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_tl0

mem_address_not_aligned_tl0:

	PREEMPTIBLE_HANDLER mem_address_not_aligned

/* TT = 0x35, TL = 0, LDDF_mem_address_not_aligned */

.org trap_table + TT_LDDF_MEM_ADDRESS_NOT_ALIGNED*ENTRY_SIZE

.global LDDF_mem_address_not_aligned_tl0

LDDF_mem_address_not_aligned_tl0:

	PREEMPTIBLE_HANDLER LDDF_mem_address_not_aligned

/* TT = 0x36, TL = 0, STDF_mem_address_not_aligned */

.org trap_table + TT_STDF_MEM_ADDRESS_NOT_ALIGNED*ENTRY_SIZE

.global STDF_mem_address_not_aligned_tl0

STDF_mem_address_not_aligned_tl0:

	PREEMPTIBLE_HANDLER STDF_mem_address_not_aligned

/* TT = 0x37, TL = 0, privileged_action */

.org trap_table + TT_PRIVILEGED_ACTION*ENTRY_SIZE

.global privileged_action_tl0

privileged_action_tl0:

	PREEMPTIBLE_HANDLER privileged_action

/* TT = 0x38, TL = 0, LDQF_mem_address_not_aligned */

.org trap_table + TT_LDQF_MEM_ADDRESS_NOT_ALIGNED*ENTRY_SIZE

.global LDQF_mem_address_not_aligned_tl0

LDQF_mem_address_not_aligned_tl0:

	PREEMPTIBLE_HANDLER LDQF_mem_address_not_aligned

/* TT = 0x39, TL = 0, STQF_mem_address_not_aligned */

.org trap_table + TT_STQF_MEM_ADDRESS_NOT_ALIGNED*ENTRY_SIZE

.global STQF_mem_address_not_aligned_tl0

STQF_mem_address_not_aligned_tl0:

	PREEMPTIBLE_HANDLER STQF_mem_address_not_aligned

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

.org trap_table + TT_INTERRUPT_LEVEL_1*ENTRY_SIZE

.global interrupt_level_1_handler_tl0

interrupt_level_1_handler_tl0:

	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_tl0

interrupt_level_2_handler_tl0:

	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_tl0

interrupt_level_3_handler_tl0:

	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_tl0

interrupt_level_4_handler_tl0:

	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_tl0

interrupt_level_5_handler_tl0:

	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_tl0

interrupt_level_6_handler_tl0:

	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_tl0

interrupt_level_7_handler_tl0:

	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_tl0

interrupt_level_8_handler_tl0:

	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_tl0

interrupt_level_9_handler_tl0:

	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_tl0

interrupt_level_10_handler_tl0:

	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_tl0

interrupt_level_11_handler_tl0:

	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_tl0

interrupt_level_12_handler_tl0:

	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_tl0

interrupt_level_13_handler_tl0:

	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_tl0

interrupt_level_14_handler_tl0:

	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_tl0

interrupt_level_15_handler_tl0:

	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_tl0

interrupt_vector_trap_handler_tl0:

	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_tl0

fast_instruction_access_mmu_miss_handler_tl0:

	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_tl0

fast_data_access_mmu_miss_handler_tl0:

	FAST_DATA_ACCESS_MMU_MISS_HANDLER 0

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

.org trap_table + TT_FAST_DATA_ACCESS_PROTECTION*ENTRY_SIZE

.global fast_data_access_protection_handler_tl0

fast_data_access_protection_handler_tl0:

	FAST_DATA_ACCESS_PROTECTION_HANDLER 0

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

.org trap_table + TT_SPILL_0_NORMAL*ENTRY_SIZE

.global spill_0_normal_tl0

spill_0_normal_tl0:

	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_tl0

spill_1_normal_tl0:

	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_tl0

spill_2_normal_tl0:

	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_tl0

spill_0_other_tl0:

	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_tl0

fill_0_normal_tl0:

	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_tl0

fill_1_normal_tl0:

	FILL_NORMAL_HANDLER_USERSPACE

/* TT = 0x100 - 0x17f, TL = 0, trap_instruction_0 - trap_instruction_7f */

.irp cur, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,\

    20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38,\

    39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57,\

    58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76,\

    77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95,\

    96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111,\

    112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126,\

    127

.org trap_table + (TT_TRAP_INSTRUCTION_0+\cur)*ENTRY_SIZE

.global trap_instruction_\cur\()_tl0

trap_instruction_\cur\()_tl0:

	ba trap_instruction_handler

	mov \cur, %g2

.endr

/*

 * 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_tl1

instruction_access_exception_tl1:

	/*wrpr %g0, 1, %tl

	wrpr %g0, PSTATE_AG_BIT | PSTATE_PRIV_BIT, %pstate

	PREEMPTIBLE_HANDLER instruction_access_exception*/

/* TT = 0x0a, TL > 0, instruction_access_error */

.org trap_table + (TT_INSTRUCTION_ACCESS_ERROR+512)*ENTRY_SIZE

.global instruction_access_error_tl1

instruction_access_error_tl1:

	wrpr %g0, 1, %tl

	PREEMPTIBLE_HANDLER instruction_access_error

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

.org trap_table + (TT_ILLEGAL_INSTRUCTION+512)*ENTRY_SIZE

.global illegal_instruction_tl1

illegal_instruction_tl1:

	wrpr %g0, 1, %tl

	PREEMPTIBLE_HANDLER illegal_instruction

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

.org trap_table + (TT_CLEAN_WINDOW+512)*ENTRY_SIZE

.global clean_window_tl1

clean_window_tl1:

	CLEAN_WINDOW_HANDLER

/* TT = 0x28, TL > 0, division_by_zero */

.org trap_table + (TT_DIVISION_BY_ZERO+512)*ENTRY_SIZE

.global division_by_zero_tl1

division_by_zero_tl1:

	wrpr %g0, 1, %tl

	PREEMPTIBLE_HANDLER division_by_zero

/* TT = 0x30, TL > 0, data_access_exception */

.org trap_table + (TT_DATA_ACCESS_EXCEPTION+512)*ENTRY_SIZE

.global data_access_exception_tl1

data_access_exception_tl1:

	/*wrpr %g0, 1, %tl

	wrpr %g0, PSTATE_AG_BIT | PSTATE_PRIV_BIT, %pstate

	PREEMPTIBLE_HANDLER data_access_exception*/

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

.org trap_table + (TT_DATA_ACCESS_ERROR+512)*ENTRY_SIZE

.global data_access_error_tl1

data_access_error_tl1:

	wrpr %g0, 1, %tl

	PREEMPTIBLE_HANDLER 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_tl1

mem_address_not_aligned_tl1:

	wrpr %g0, 1, %tl

	PREEMPTIBLE_HANDLER mem_address_not_aligned

/* 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_tl1

fast_data_access_mmu_miss_handler_tl1:

	FAST_DATA_ACCESS_MMU_MISS_HANDLER 1

/* 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_tl1

fast_data_access_protection_handler_tl1:

	FAST_DATA_ACCESS_PROTECTION_HANDLER 1

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

.org trap_table + (TT_SPILL_0_NORMAL+512)*ENTRY_SIZE

.global spill_0_normal_tl1

spill_0_normal_tl1:

	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_tl1

spill_2_normal_tl1:

	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_tl1

spill_0_other_tl1:

	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_tl1

fill_0_normal_tl1:

	FILL_NORMAL_HANDLER_KERNEL

.align TABLE_SIZE

/*

 * Spills the window at CWP + 2 to the kernel stack. This macro is to be

 * used before doing SAVE when the spill trap is undesirable.

 * 

 * Parameters:

 * 	tmpreg1		global register to be used for scratching purposes

 * 	tmpreg2		global register to be used for scratching purposes

 */

.macro INLINE_SPILL tmpreg1, tmpreg2

	! CWP := CWP + 2

	rdpr %cwp, \tmpreg2

	add \tmpreg2, 2, \tmpreg1

	and \tmpreg1, NWINDOWS - 1, \tmpreg1		! modulo NWINDOWS

	wrpr \tmpreg1, %cwp

	! spill to kernel stack

	stx %l0, [%sp + STACK_BIAS + L0_OFFSET]	

	stx %l1, [%sp + STACK_BIAS + L1_OFFSET]

	stx %l2, [%sp + STACK_BIAS + L2_OFFSET]

	stx %l3, [%sp + STACK_BIAS + L3_OFFSET]

	stx %l4, [%sp + STACK_BIAS + L4_OFFSET]

	stx %l5, [%sp + STACK_BIAS + L5_OFFSET]

	stx %l6, [%sp + STACK_BIAS + L6_OFFSET]

	stx %l7, [%sp + STACK_BIAS + L7_OFFSET]

	stx %i0, [%sp + STACK_BIAS + I0_OFFSET]

	stx %i1, [%sp + STACK_BIAS + I1_OFFSET]

	stx %i2, [%sp + STACK_BIAS + I2_OFFSET]

	stx %i3, [%sp + STACK_BIAS + I3_OFFSET]

	stx %i4, [%sp + STACK_BIAS + I4_OFFSET]

	stx %i5, [%sp + STACK_BIAS + I5_OFFSET]

	stx %i6, [%sp + STACK_BIAS + I6_OFFSET]

	stx %i7, [%sp + STACK_BIAS + I7_OFFSET]

	! CWP := CWP - 2

	wrpr \tmpreg2, %cwp

	saved

.endm

/*

 * Fill the window at CWP - 1 from the kernel stack. This macro is to be

 * used before doing RESTORE when the fill trap is undesirable.

 * 

 * Parameters:

 * 	tmpreg1		global register to be used for scratching purposes

 * 	tmpreg2		global register to be used for scratching purposes

 */

.macro INLINE_FILL tmpreg1, tmpreg2

	! CWP := CWP - 1

	rdpr %cwp, \tmpreg2

	add \tmpreg2, NWINDOWS - 1, \tmpreg1

	and \tmpreg1, NWINDOWS - 1, \tmpreg1

	wrpr \tmpreg1, %cwp

	! fill from kernel stack

	ldx [%sp + STACK_BIAS + L0_OFFSET], %l0

	ldx [%sp + STACK_BIAS + L1_OFFSET], %l1

	ldx [%sp + STACK_BIAS + L2_OFFSET], %l2

	ldx [%sp + STACK_BIAS + L3_OFFSET], %l3

	ldx [%sp + STACK_BIAS + L4_OFFSET], %l4

	ldx [%sp + STACK_BIAS + L5_OFFSET], %l5

	ldx [%sp + STACK_BIAS + L6_OFFSET], %l6

	ldx [%sp + STACK_BIAS + L7_OFFSET], %l7

	ldx [%sp + STACK_BIAS + I0_OFFSET], %i0

	ldx [%sp + STACK_BIAS + I1_OFFSET], %i1

	ldx [%sp + STACK_BIAS + I2_OFFSET], %i2

	ldx [%sp + STACK_BIAS + I3_OFFSET], %i3

	ldx [%sp + STACK_BIAS + I4_OFFSET], %i4

	ldx [%sp + STACK_BIAS + I5_OFFSET], %i5

	ldx [%sp + STACK_BIAS + I6_OFFSET], %i6

	ldx [%sp + STACK_BIAS + I7_OFFSET], %i7

	! CWP := CWP + 1

	wrpr \tmpreg2, %cwp

	restored

.endm

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

/*

 * Perform all the actions of the preemptible trap handler which are common

 * for trapping from kernel and trapping from userspace, including call of the

 * higher level service routine.

 *

 * Important note:

 * 	This macro must be inserted between the "2:" and "4:" labels. The

 *	inserting code must be aware of the usage of all the registers

 *	contained in this macro.

 */

.macro MIDDLE_PART is_syscall

	/* copy higher level routine's address and its argument */

	mov %g1, %l0

.if NOT(\is_syscall)

	mov %g2, %o0

.else

	! store the syscall number on the stack as 7th argument

	stx %g2, [%sp + STACK_WINDOW_SAVE_AREA_SIZE + STACK_BIAS + STACK_ARG6] 

.endif

	/*

	 * Save TSTATE, TPC and TNPC aside.

	 */

	rdpr %tstate, %g1

	rdpr %tpc, %g2

	rdpr %tnpc, %g3

	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]

	/*

	 * Save the Y register.

	 * This register is deprecated according to SPARC V9 specification

	 * and is only present for backward compatibility with previous

	 * versions of the SPARC architecture.

	 * Surprisingly, gcc makes use of this register without a notice.

	 */

	rd %y, %g4

	stx %g4, [%sp + PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE + STACK_BIAS + SAVED_Y]

	/* switch to TL = 0, explicitly enable FPU */

	wrpr %g0, 0, %tl

	wrpr %g0, 0, %gl

	wrpr %g0, PSTATE_PRIV_BIT | PSTATE_PEF_BIT, %pstate

	/* g1 -> l1, ..., g7 -> l7 */

	SAVE_GLOBALS

.if NOT(\is_syscall)

	/* call higher-level service routine, pass istate as its 2nd parameter */

	call %l0

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

.else

	/* Call the higher-level syscall handler. */

	!wrpr %g0, PSTATE_PRIV_BIT | PSTATE_PEF_BIT | PSTATE_IE_BIT, %pstate

	call syscall_handler

	nop

	/* copy the value returned by the syscall */

	mov %o0, %i0

.endif

	/* l1 -> g1, ..., l7 -> g7 */

	RESTORE_GLOBALS

	/* we must prserve the PEF bit */

	rdpr %pstate, %l1

	/* TL := 1, GL := 1 */

	wrpr %g0, PSTATE_PRIV_BIT, %pstate

	wrpr %g0, 1, %tl

	wrpr %g0, 1, %gl

	/* 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

	/* Copy PSTATE.PEF to the in-register copy of TSTATE. */

	and %l1, PSTATE_PEF_BIT, %l1

	sllx %l1, TSTATE_PSTATE_SHIFT, %l1

	sethi %hi(TSTATE_PEF_BIT), %g4		! reset the PEF bit to 0 ...

	andn %g1, %g4, %g1

	or %g1, %l1, %g1			! ... "or" it with saved PEF

	/* Restore TSTATE, TPC and TNPC from saved copies. */

	wrpr %g1, 0, %tstate

	wrpr %g2, 0, %tpc

	wrpr %g3, 0, %tnpc

	/* Restore Y. */

	ldx [%sp + PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE + STACK_BIAS + SAVED_Y], %g4

	wr %g4, %y

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

	and %g1, TSTATE_CWP_MASK, %l0

	inc %l0

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

	rdpr %cwp, %l1

	cmp %l0, %l1

	bz 4f				! CWP is ok

	nop

3:

	/*

	 * 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

.endm

/*

 * Preemptible trap handler for handling traps from kernel.

 */

.macro PREEMPTIBLE_HANDLER_KERNEL

	/*

	 * ASSERT(%tl == 1)

	 */

	rdpr %tl, %g3

	cmp %g3, 1

	be 1f

	nop

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

	nop					! it will be easy to find

1:

	/* prevent unnecessary CLEANWIN exceptions */

	wrpr %g0, NWINDOWS - 1, %cleanwin

	/*

	 * Prevent SAVE instruction from causing a spill exception. If the

	 * CANSAVE register is zero, explicitly spill register window

	 * at CWP + 2.

	 */

	rdpr %cansave, %g3

	brnz %g3, 2f

	nop

	INLINE_SPILL %g3, %g4

2:

	/* ask for new register window */

	save %sp, -PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE, %sp

	MIDDLE_PART 0

4:

	/*

	 * Prevent RESTORE instruction from causing a fill exception. If the

	 * CANRESTORE register is zero, explicitly fill register window

	 * at CWP - 1.

	 */

	rdpr %canrestore, %g1

	brnz %g1, 5f

	nop

	INLINE_FILL %g3, %g4

5:

	restore

	retry

.endm

/*

 * Spills the window at CWP + 2 to the userspace window buffer. This macro

 * is to be used before doing SAVE when the spill trap is undesirable.

 * 

 * Parameters:

 * 	tmpreg1		global register to be used for scratching purposes

 * 	tmpreg2		global register to be used for scratching purposes

 * 	tmpreg3		global register to be used for scratching purposes

 */

.macro INLINE_SPILL_TO_WBUF tmpreg1, tmpreg2, tmpreg3

	! CWP := CWP + 2

	rdpr %cwp, \tmpreg2

	add \tmpreg2, 2, \tmpreg1

	and \tmpreg1, NWINDOWS - 1, \tmpreg1		! modulo NWINDOWS

	wrpr \tmpreg1, %cwp

	! spill to userspace window buffer

	SAVE_TO_USPACE_WBUF \tmpreg3, \tmpreg1

	! CWP := CWP - 2

	wrpr \tmpreg2, %cwp

	saved

.endm

/*

 * Preemptible handler for handling traps from userspace.

 */

.macro PREEMPTIBLE_HANDLER_USPACE is_syscall

	/*

	 * One of the ways this handler can be invoked is after a nested MMU trap from

	 * either spill_1_normal or fill_1_normal traps. Both of these traps manipulate

	 * the CWP register. We deal with the situation by simulating the MMU trap

	 * on TL=1 and restart the respective SAVE or RESTORE instruction once the MMU

	 * trap is resolved. However, because we are in the wrong window from the

	 * perspective of the MMU trap, we need to synchronize CWP with CWP from TL=0.

	 */ 

.if NOT(\is_syscall)

	rdpr %tstate, %g3

	and %g3, TSTATE_CWP_MASK, %g4

	wrpr %g4, 0, %cwp			! resynchronize CWP

.endif

	/* prevent unnecessary CLEANWIN exceptions */

	wrpr %g0, NWINDOWS - 1, %cleanwin

	/*

	 * Prevent SAVE instruction from causing a spill exception. If the

	 * CANSAVE register is zero, explicitly spill register window

	 * at CWP + 2.

	 */

	rdpr %cansave, %g3

	brnz %g3, 2f

	nop

	INLINE_SPILL_TO_WBUF %g3, %g4, %g7

2:

	get_kstack_wbuf_ptr %g3, %g4

	ldx [%g4], %g6

	save %g6, -PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE, %sp

.if \is_syscall

	/* Copy arguments for the syscall to the new window. */

	mov %i0, %o0

	mov %i1, %o1

	mov %i2, %o2

	mov %i3, %o3

	mov %i4, %o4

	mov %i5, %o5

.endif

	mov VA_PRIMARY_CONTEXT_REG, %l0 

	stxa %g0, [%l0] ASI_PRIMARY_CONTEXT_REG

	rd %pc, %l0

	flush %l0

	/* Mark the CANRESTORE windows as OTHER windows. */

	rdpr %canrestore, %l0

	wrpr %l0, %otherwin

	wrpr %g0, %canrestore

	/*

	 * 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

	MIDDLE_PART \is_syscall

4:

	/*

	 * 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_SECONDARY_CONTEXT_REG, %asi

	ldxa [VA_SECONDARY_CONTEXT_REG] %asi, %g1

	wr %g0, ASI_PRIMARY_CONTEXT_REG, %asi

	stxa %g1, [VA_PRIMARY_CONTEXT_REG] %asi

	rd %pc, %g1

	flush %g1

	/* Restoring userspace windows: */

	/* Save address of the userspace window buffer to the %g7 register. */

	get_kstack_wbuf_ptr %g1, %g5

	ldx [%g5 + 8], %g7

	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, NWINDOWS - 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

5:	andcc %g7, UWB_ALIGNMENT - 1, %g0	! alignment check

	bz 6f					! %g7 is UWB_ALIGNMENT-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, NWINDOWS - 1, %g3

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

	ba 5b

	inc %g4

6:

	/* Save changes of the address of the userspace window buffer. */

	stx %g7, [%g5 + 8]

	/*

	 * Switch back to the proper current window and adjust

	 * OTHERWIN, CANRESTORE, CANSAVE and CLEANWIN.

	 */

	wrpr %g1, 0, %cwp

	add %g4, %g2, %g2

	cmp %g2, NWINDOWS - 2

	bg 8f					! fix the CANRESTORE=NWINDOWS-1 anomaly

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

	sub %g1, %g2, %g1

	wrpr %g0, 0, %otherwin

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

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

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

7:

	restore

.if \is_syscall

	done

.else

	retry

.endif

8:

	/*

	 * 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 NWINDOWS - 1 register windows.

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

	 *

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

	 * and set the window state registers so that:

	 *

	 * 	CANRESTORE 	= NWINDOWS - 2

	 *	CLEANWIN	= NWINDOWS - 2

	 *	CANSAVE 	= 0

	 *	OTHERWIN	= 0

	 *

	 * The RESTORE instruction is therfore to be skipped.

	 */

	wrpr %g0, 0, %otherwin

	wrpr %g0, 0, %cansave

	wrpr %g1, 0, %canrestore

	wrpr %g1, 0, %cleanwin

	rdpr %cwp, %g1

	dec %g1

	and %g1, NWINDOWS - 1, %g1

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

.if \is_syscall

	done

.else

	retry

.endif

.endm