| 1 | #
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| 2 | # Copyright (C) 2005 Jakub Jermar
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| 3 | # All rights reserved.
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| 4 | #
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| 5 | # Redistribution and use in source and binary forms, with or without
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| 6 | # modification, are permitted provided that the following conditions
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| 7 | # are met:
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| 8 | #
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| 9 | # - Redistributions of source code must retain the above copyright
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| 10 | # notice, this list of conditions and the following disclaimer.
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| 11 | # - Redistributions in binary form must reproduce the above copyright
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| 12 | # notice, this list of conditions and the following disclaimer in the
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| 13 | # documentation and/or other materials provided with the distribution.
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| 14 | # - The name of the author may not be used to endorse or promote products
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| 15 | # derived from this software without specific prior written permission.
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| 16 | #
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| 17 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | #
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| 28 |
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| 29 | /**
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| 30 | * This file contains two trap tables.
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| 31 | * First, trap_table, is the one wich contains handlers implemented by
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| 32 | * kernel. During initialization, these handlers are copied out to
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| 33 | * the second trap table, trap_table_save, and the first table is
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| 34 | * overwritten with copy of OFW's own trap table. The copy is then patched
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| 35 | * from the trap_table_save.
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| 36 | *
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| 37 | * This arrangement is beneficial because kernel handlers stay on their
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| 38 | * link-time addresses which is good for debugging.
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| 39 | */
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| 40 |
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| 41 | .register %g2, #scratch
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| 42 | .register %g3, #scratch
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| 43 | .register %g6, #scratch
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| 44 | .register %g7, #scratch
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| 45 |
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| 46 | .text
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| 47 |
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| 48 | #include <arch/trap/trap_table.h>
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| 49 | #include <arch/trap/regwin.h>
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| 50 | #include <arch/trap/interrupt.h>
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| 51 | #include <arch/trap/exception.h>
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| 52 | #include <arch/stack.h>
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| 53 |
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| 54 | #define TABLE_SIZE TRAP_TABLE_SIZE
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| 55 | #define ENTRY_SIZE TRAP_TABLE_ENTRY_SIZE
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| 56 |
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| 57 | /*
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| 58 | * Kernel trap table.
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| 59 | */
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| 60 | .align TABLE_SIZE
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| 61 | .global trap_table
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| 62 | trap_table:
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| 63 |
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| 64 | /* TT = 0x08, TL = 0, instruction_access_exception */
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| 65 | .org trap_table + TT_INSTRUCTION_ACCESS_EXCEPTION*ENTRY_SIZE
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| 66 | .global instruction_access_exception
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| 67 | instruction_access_exception:
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| 68 | SIMPLE_HANDLER do_instruction_access_exc
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| 69 |
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| 70 | /* TT = 0x24, TL = 0, clean_window handler */
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| 71 | .org trap_table + TT_CLEAN_WINDOW*ENTRY_SIZE
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| 72 | .global clean_window_handler
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| 73 | clean_window_handler:
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| 74 | CLEAN_WINDOW_HANDLER
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| 75 |
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| 76 | /* TT = 0x34, TL = 0, mem_address_not_aligned */
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| 77 | .org trap_table + TT_MEM_ADDRESS_NOT_ALIGNED*ENTRY_SIZE
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| 78 | .global mem_address_not_aligned
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| 79 | mem_address_not_aligned:
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| 80 | SIMPLE_HANDLER do_mem_address_not_aligned
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| 81 |
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| 82 | /* TT = 0x41, TL = 0, interrupt_level_1 handler */
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| 83 | .org trap_table + TT_INTERRUPT_LEVEL_1*ENTRY_SIZE
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| 84 | .global interrupt_level_1_handler
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| 85 | interrupt_level_1_handler:
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| 86 | INTERRUPT_LEVEL_N_HANDLER 1
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| 87 |
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| 88 | /* TT = 0x42, TL = 0, interrupt_level_2 handler */
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| 89 | .org trap_table + TT_INTERRUPT_LEVEL_2*ENTRY_SIZE
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| 90 | .global interrupt_level_2_handler
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| 91 | interrupt_level_2_handler:
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| 92 | INTERRUPT_LEVEL_N_HANDLER 2
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| 93 |
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| 94 | /* TT = 0x43, TL = 0, interrupt_level_3 handler */
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| 95 | .org trap_table + TT_INTERRUPT_LEVEL_3*ENTRY_SIZE
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| 96 | .global interrupt_level_3_handler
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| 97 | interrupt_level_3_handler:
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| 98 | INTERRUPT_LEVEL_N_HANDLER 3
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| 99 |
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| 100 | /* TT = 0x44, TL = 0, interrupt_level_4 handler */
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| 101 | .org trap_table + TT_INTERRUPT_LEVEL_4*ENTRY_SIZE
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| 102 | .global interrupt_level_4_handler
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| 103 | interrupt_level_4_handler:
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| 104 | INTERRUPT_LEVEL_N_HANDLER 4
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| 105 |
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| 106 | /* TT = 0x45, TL = 0, interrupt_level_5 handler */
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| 107 | .org trap_table + TT_INTERRUPT_LEVEL_5*ENTRY_SIZE
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| 108 | .global interrupt_level_5_handler
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| 109 | interrupt_level_5_handler:
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| 110 | INTERRUPT_LEVEL_N_HANDLER 5
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| 111 |
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| 112 | /* TT = 0x46, TL = 0, interrupt_level_6 handler */
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| 113 | .org trap_table + TT_INTERRUPT_LEVEL_6*ENTRY_SIZE
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| 114 | .global interrupt_level_6_handler
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| 115 | interrupt_level_6_handler:
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| 116 | INTERRUPT_LEVEL_N_HANDLER 6
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| 117 |
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| 118 | /* TT = 0x47, TL = 0, interrupt_level_7 handler */
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| 119 | .org trap_table + TT_INTERRUPT_LEVEL_7*ENTRY_SIZE
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| 120 | .global interrupt_level_7_handler
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| 121 | interrupt_level_7_handler:
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| 122 | INTERRUPT_LEVEL_N_HANDLER 7
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| 123 |
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| 124 | /* TT = 0x48, TL = 0, interrupt_level_8 handler */
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| 125 | .org trap_table + TT_INTERRUPT_LEVEL_8*ENTRY_SIZE
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| 126 | .global interrupt_level_8_handler
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| 127 | interrupt_level_8_handler:
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| 128 | INTERRUPT_LEVEL_N_HANDLER 8
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| 129 |
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| 130 | /* TT = 0x49, TL = 0, interrupt_level_9 handler */
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| 131 | .org trap_table + TT_INTERRUPT_LEVEL_9*ENTRY_SIZE
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| 132 | .global interrupt_level_9_handler
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| 133 | interrupt_level_9_handler:
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| 134 | INTERRUPT_LEVEL_N_HANDLER 9
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| 135 |
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| 136 | /* TT = 0x4a, TL = 0, interrupt_level_10 handler */
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| 137 | .org trap_table + TT_INTERRUPT_LEVEL_10*ENTRY_SIZE
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| 138 | .global interrupt_level_10_handler
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| 139 | interrupt_level_10_handler:
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| 140 | INTERRUPT_LEVEL_N_HANDLER 10
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| 141 |
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| 142 | /* TT = 0x4b, TL = 0, interrupt_level_11 handler */
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| 143 | .org trap_table + TT_INTERRUPT_LEVEL_11*ENTRY_SIZE
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| 144 | .global interrupt_level_11_handler
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| 145 | interrupt_level_11_handler:
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| 146 | INTERRUPT_LEVEL_N_HANDLER 11
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| 147 |
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| 148 | /* TT = 0x4c, TL = 0, interrupt_level_12 handler */
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| 149 | .org trap_table + TT_INTERRUPT_LEVEL_12*ENTRY_SIZE
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| 150 | .global interrupt_level_12_handler
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| 151 | interrupt_level_12_handler:
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| 152 | INTERRUPT_LEVEL_N_HANDLER 12
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| 153 |
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| 154 | /* TT = 0x4d, TL = 0, interrupt_level_13 handler */
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| 155 | .org trap_table + TT_INTERRUPT_LEVEL_13*ENTRY_SIZE
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| 156 | .global interrupt_level_13_handler
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| 157 | interrupt_level_13_handler:
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| 158 | INTERRUPT_LEVEL_N_HANDLER 13
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| 159 |
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| 160 | /* TT = 0x4e, TL = 0, interrupt_level_14 handler */
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| 161 | .org trap_table + TT_INTERRUPT_LEVEL_14*ENTRY_SIZE
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| 162 | .global interrupt_level_14_handler
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| 163 | interrupt_level_14_handler:
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| 164 | INTERRUPT_LEVEL_N_HANDLER 14
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| 165 |
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| 166 | /* TT = 0x4f, TL = 0, interrupt_level_15 handler */
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| 167 | .org trap_table + TT_INTERRUPT_LEVEL_15*ENTRY_SIZE
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| 168 | .global interrupt_level_15_handler
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| 169 | interrupt_level_15_handler:
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| 170 | INTERRUPT_LEVEL_N_HANDLER 15
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| 171 |
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| 172 | /* TT = 0x60, TL = 0, interrupt_vector_trap handler */
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| 173 | .org trap_table + TT_INTERRUPT_VECTOR_TRAP*ENTRY_SIZE
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| 174 | .global interrupt_vector_trap_handler
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| 175 | interrupt_vector_trap_handler:
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| 176 | INTERRUPT_VECTOR_TRAP_HANDLER
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| 177 |
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| 178 | /* TT = 0x80, TL = 0, spill_0_normal handler */
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| 179 | .org trap_table + TT_SPILL_0_NORMAL*ENTRY_SIZE
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| 180 | .global spill_0_normal
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| 181 | spill_0_normal:
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| 182 | SPILL_NORMAL_HANDLER
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| 183 |
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| 184 | /* TT = 0xc0, TL = 0, fill_0_normal handler */
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| 185 | .org trap_table + TT_FILL_0_NORMAL*ENTRY_SIZE
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| 186 | .global fill_0_normal
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| 187 | fill_0_normal:
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| 188 | FILL_NORMAL_HANDLER
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| 189 |
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| 190 | /*
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| 191 | * Handlers for TL>0.
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| 192 | */
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| 193 |
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| 194 | /* TT = 0x08, TL > 0, instruction_access_exception */
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| 195 | .org trap_table + (TT_INSTRUCTION_ACCESS_EXCEPTION+512)*ENTRY_SIZE
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| 196 | .global instruction_access_exception_high
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| 197 | instruction_access_exception_high:
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| 198 | SIMPLE_HANDLER do_instruction_access_exc
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| 199 |
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| 200 | /* TT = 0x24, TL > 0, clean_window handler */
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| 201 | .org trap_table + (TT_CLEAN_WINDOW+512)*ENTRY_SIZE
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| 202 | .global clean_window_handler_high
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| 203 | clean_window_handler_high:
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| 204 | CLEAN_WINDOW_HANDLER
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| 205 |
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| 206 | /* TT = 0x34, TL > 0, mem_address_not_aligned */
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| 207 | .org trap_table + (TT_MEM_ADDRESS_NOT_ALIGNED+512)*ENTRY_SIZE
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| 208 | .global mem_address_not_aligned_high
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| 209 | mem_address_not_aligned_high:
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| 210 | SIMPLE_HANDLER do_mem_address_not_aligned
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| 211 |
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| 212 | /* TT = 0x80, TL > 0, spill_0_normal handler */
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| 213 | .org trap_table + (TT_SPILL_0_NORMAL+512)*ENTRY_SIZE
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| 214 | .global spill_0_normal_high
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| 215 | spill_0_normal_high:
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| 216 | SPILL_NORMAL_HANDLER
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| 217 |
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| 218 | /* TT = 0xc0, TL > 0, fill_0_normal handler */
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| 219 | .org trap_table + (TT_FILL_0_NORMAL+512)*ENTRY_SIZE
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| 220 | .global fill_0_normal_high
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| 221 | fill_0_normal_high:
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| 222 | FILL_NORMAL_HANDLER
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| 223 |
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| 224 |
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| 225 |
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| 226 | /*
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| 227 | * Save trap table.
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| 228 | */
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| 229 | .align TABLE_SIZE
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| 230 | .global trap_table_save
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| 231 | trap_table_save:
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| 232 | .space TABLE_SIZE, 0
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| 233 |
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| 234 |
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| 235 | /* Preemptible trap handler.
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| 236 | *
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| 237 | * This trap handler makes arrangements to
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| 238 | * make calling scheduler() possible.
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| 239 | *
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| 240 | * The caller is responsible for doing save
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| 241 | * and allocating PREEMPTIBLE_HANDLER_STACK_FRAME_SIZE
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| 242 | * bytes on stack.
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| 243 | *
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| 244 | * Input registers:
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| 245 | * %l0 Address of function to call.
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| 246 | * Output registers:
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| 247 | * %l1 - %l7 Copy of %g1 - %g7
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| 248 | */
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| 249 | .global preemptible_handler
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| 250 | preemptible_handler:
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| 251 | /*
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| 252 | * Save TSTATE, TPC, TNPC and PSTATE aside.
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| 253 | */
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| 254 | rdpr %tstate, %g1
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| 255 | rdpr %tpc, %g2
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| 256 | rdpr %tnpc, %g3
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| 257 | rdpr %pstate, %g4
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| 258 |
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| 259 | stx %g1, [%fp + STACK_BIAS + SAVED_TSTATE]
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| 260 | stx %g2, [%fp + STACK_BIAS + SAVED_TPC]
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| 261 | stx %g3, [%fp + STACK_BIAS + SAVED_TNPC]
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| 262 | stx %g4, [%fp + STACK_BIAS + SAVED_PSTATE]
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| 263 |
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| 264 | /*
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| 265 | * Write 0 to TL.
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| 266 | */
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| 267 | wrpr %g0, 0, %tl
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| 268 |
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| 269 | /*
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| 270 | * Alter PSTATE.
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| 271 | * - switch to normal globals.
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| 272 | */
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| 273 | and %g4, ~1, %g4 ! mask alternate globals
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| 274 | wrpr %g4, 0, %pstate
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| 275 |
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| 276 | /*
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| 277 | * Save the normal globals.
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| 278 | */
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| 279 | SAVE_GLOBALS
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| 280 |
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| 281 | /*
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| 282 | * Call the higher-level handler.
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| 283 | */
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| 284 | call %l0
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| 285 | nop
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| 286 |
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| 287 | /*
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| 288 | * Restore the normal global register set.
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| 289 | */
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| 290 | RESTORE_GLOBALS
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| 291 |
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| 292 | /*
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| 293 | * Restore PSTATE from saved copy.
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| 294 | * Alternate globals become active.
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| 295 | */
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| 296 | ldx [%fp + STACK_BIAS + SAVED_PSTATE], %l4
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| 297 | wrpr %l4, 0, %pstate
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| 298 |
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| 299 | /*
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| 300 | * Write 1 to TL.
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| 301 | */
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| 302 | wrpr %g0, 1, %tl
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| 303 |
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| 304 | /*
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| 305 | * Read TSTATE, TPC and TNPC from saved copy.
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| 306 | */
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| 307 | ldx [%fp + STACK_BIAS + SAVED_TSTATE], %g1
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| 308 | ldx [%fp + STACK_BIAS + SAVED_TPC], %g2
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| 309 | ldx [%fp + STACK_BIAS + SAVED_TNPC], %g3
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| 310 |
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| 311 | /*
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| 312 | * Do restore to match the save instruction from the top-level handler.
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| 313 | */
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| 314 | restore
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| 315 |
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| 316 | /*
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| 317 | * On execution of retry instruction, CWP will be restored from TSTATE register.
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| 318 | * However, because of scheduling, it is possible that CWP in saved TSTATE
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| 319 | * is different from current CWP. The following chunk of code fixes CWP
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| 320 | * in the saved copy of TSTATE.
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| 321 | */
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| 322 | rdpr %cwp, %g4 ! read current CWP
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| 323 | and %g1, ~0x1f, %g1 ! clear CWP field in saved TSTATE
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| 324 | or %g1, %g4, %g1 ! write current CWP to TSTATE
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| 325 |
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| 326 | /*
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| 327 | * Restore TSTATE, TPC and TNPC from saved copies.
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| 328 | */
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| 329 | wrpr %g1, 0, %tstate
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| 330 | wrpr %g2, 0, %tpc
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| 331 | wrpr %g3, 0, %tnpc
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| 332 |
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| 333 | /*
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| 334 | * Return from interrupt.
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| 335 | */
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| 336 | retry
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