| 1 | /* |
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| 2 | * Copyrigh (c) 2015 Hesham Almatary <hesham@alumni.york.ac.uk> |
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| 3 | * |
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| 4 | * Redistribution and use in source and binary forms, with or without |
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| 5 | * modification, are permitted provided that the following conditions |
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| 6 | * are met: |
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| 7 | * 1. Redistributions of source code must retain the above copyright |
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| 8 | * notice, this list of conditions and the following disclaimer. |
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| 9 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer in the |
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| 11 | * documentation and/or other materials provided with the distribution. |
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| 12 | * |
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| 13 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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| 14 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 15 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 16 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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| 17 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 18 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 19 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 20 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 21 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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| 22 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 23 | * SUCH DAMAGE. |
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| 24 | */ |
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| 25 | |
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| 26 | #ifdef HAVE_CONFIG_H |
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| 27 | #include "config.h" |
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| 28 | #endif |
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| 29 | |
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| 30 | #include <rtems/asm.h> |
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| 31 | #include <rtems/score/cpu.h> |
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| 32 | |
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| 33 | .section .text, "ax", @progbits |
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| 34 | .align 2 |
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| 35 | |
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| 36 | PUBLIC(_CPU_Context_validate) |
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| 37 | SYM(_CPU_Context_validate): |
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| 38 | /* RISC-V/RTEMS context has 36 registers of CPU_SIZEOF_POINTER size */ |
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| 39 | addi sp, sp, -1 * 36 * CPU_SIZEOF_POINTER |
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| 40 | |
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| 41 | SREG x1, (1 * CPU_SIZEOF_POINTER)(sp) |
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| 42 | /* Skip x2/sp */ |
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| 43 | SREG x3, (3 * CPU_SIZEOF_POINTER)(sp) |
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| 44 | SREG x4, (4 * CPU_SIZEOF_POINTER)(sp) |
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| 45 | SREG x5, (5 * CPU_SIZEOF_POINTER)(sp) |
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| 46 | SREG x6, (6 * CPU_SIZEOF_POINTER)(sp) |
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| 47 | SREG x7, (7 * CPU_SIZEOF_POINTER)(sp) |
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| 48 | SREG x8, (8 * CPU_SIZEOF_POINTER)(sp) |
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| 49 | SREG x9, (9 * CPU_SIZEOF_POINTER)(sp) |
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| 50 | SREG x10, (10 * CPU_SIZEOF_POINTER)(sp) |
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| 51 | SREG x11, (11 * CPU_SIZEOF_POINTER)(sp) |
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| 52 | SREG x12, (12 * CPU_SIZEOF_POINTER)(sp) |
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| 53 | SREG x13, (13 * CPU_SIZEOF_POINTER)(sp) |
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| 54 | SREG x14, (14 * CPU_SIZEOF_POINTER)(sp) |
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| 55 | SREG x15, (15 * CPU_SIZEOF_POINTER)(sp) |
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| 56 | SREG x16, (16 * CPU_SIZEOF_POINTER)(sp) |
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| 57 | SREG x17, (17 * CPU_SIZEOF_POINTER)(sp) |
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| 58 | SREG x18, (18 * CPU_SIZEOF_POINTER)(sp) |
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| 59 | SREG x19, (19 * CPU_SIZEOF_POINTER)(sp) |
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| 60 | SREG x20, (20 * CPU_SIZEOF_POINTER)(sp) |
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| 61 | SREG x21, (21 * CPU_SIZEOF_POINTER)(sp) |
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| 62 | SREG x22, (22 * CPU_SIZEOF_POINTER)(sp) |
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| 63 | SREG x23, (23 * CPU_SIZEOF_POINTER)(sp) |
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| 64 | SREG x24, (24 * CPU_SIZEOF_POINTER)(sp) |
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| 65 | SREG x25, (25 * CPU_SIZEOF_POINTER)(sp) |
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| 66 | SREG x26, (26 * CPU_SIZEOF_POINTER)(sp) |
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| 67 | SREG x27, (27 * CPU_SIZEOF_POINTER)(sp) |
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| 68 | SREG x28, (28 * CPU_SIZEOF_POINTER)(sp) |
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| 69 | SREG x29, (28 * CPU_SIZEOF_POINTER)(sp) |
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| 70 | SREG x30, (30 * CPU_SIZEOF_POINTER)(sp) |
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| 71 | SREG x31, (31 * CPU_SIZEOF_POINTER)(sp) |
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| 72 | |
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| 73 | /* Fill */ |
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| 74 | |
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| 75 | /* t0 is used for temporary values */ |
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| 76 | mv t0, x0 |
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| 77 | |
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| 78 | /* x31 contains the stack pointer */ |
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| 79 | mv x31, sp |
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| 80 | |
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| 81 | .macro fill_register reg |
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| 82 | addi t0, t0, 1 |
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| 83 | mv \reg, t0 |
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| 84 | .endm |
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| 85 | |
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| 86 | fill_register x1 |
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| 87 | fill_register x2 |
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| 88 | fill_register x3 |
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| 89 | fill_register x4 |
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| 90 | fill_register x5 |
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| 91 | fill_register x6 |
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| 92 | fill_register x7 |
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| 93 | fill_register x8 |
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| 94 | fill_register x9 |
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| 95 | fill_register x10 |
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| 96 | fill_register x11 |
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| 97 | fill_register x12 |
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| 98 | fill_register x13 |
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| 99 | fill_register x14 |
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| 100 | fill_register x15 |
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| 101 | fill_register x16 |
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| 102 | fill_register x17 |
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| 103 | fill_register x18 |
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| 104 | fill_register x19 |
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| 105 | fill_register x20 |
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| 106 | fill_register x21 |
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| 107 | fill_register x22 |
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| 108 | fill_register x23 |
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| 109 | fill_register x24 |
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| 110 | fill_register x25 |
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| 111 | fill_register x26 |
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| 112 | fill_register x27 |
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| 113 | fill_register x28 |
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| 114 | fill_register x29 |
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| 115 | fill_register x30 |
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| 116 | fill_register x31 |
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| 117 | |
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| 118 | /* Check */ |
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| 119 | check: |
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| 120 | |
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| 121 | .macro check_register reg |
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| 122 | addi t0, t0, 1 |
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| 123 | bne \reg, t0, restore |
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| 124 | .endm |
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| 125 | |
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| 126 | bne x31, sp, restore |
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| 127 | |
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| 128 | mv t0, x0 |
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| 129 | |
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| 130 | check_register x1 |
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| 131 | check_register x2 |
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| 132 | check_register x3 |
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| 133 | check_register x4 |
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| 134 | check_register x5 |
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| 135 | check_register x6 |
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| 136 | check_register x7 |
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| 137 | check_register x8 |
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| 138 | check_register x9 |
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| 139 | check_register x10 |
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| 140 | check_register x11 |
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| 141 | check_register x12 |
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| 142 | check_register x13 |
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| 143 | check_register x14 |
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| 144 | check_register x15 |
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| 145 | check_register x16 |
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| 146 | check_register x17 |
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| 147 | check_register x18 |
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| 148 | check_register x19 |
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| 149 | check_register x20 |
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| 150 | check_register x21 |
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| 151 | check_register x22 |
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| 152 | check_register x23 |
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| 153 | check_register x24 |
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| 154 | check_register x25 |
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| 155 | check_register x26 |
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| 156 | check_register x27 |
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| 157 | check_register x28 |
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| 158 | check_register x29 |
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| 159 | check_register x30 |
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| 160 | check_register x31 |
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| 161 | |
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| 162 | j check |
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| 163 | |
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| 164 | /* Restore */ |
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| 165 | restore: |
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| 166 | LREG x1, (1 * CPU_SIZEOF_POINTER)(sp) |
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| 167 | /* Skip sp/x2 */ |
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| 168 | LREG x3, (3 * CPU_SIZEOF_POINTER)(sp) |
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| 169 | LREG x4, (4 * CPU_SIZEOF_POINTER)(sp) |
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| 170 | LREG x5, (5 * CPU_SIZEOF_POINTER)(sp) |
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| 171 | LREG x6, (6 * CPU_SIZEOF_POINTER)(sp) |
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| 172 | LREG x7, (7 * CPU_SIZEOF_POINTER)(sp) |
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| 173 | LREG x8, (8 * CPU_SIZEOF_POINTER)(sp) |
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| 174 | LREG x9, (9 * CPU_SIZEOF_POINTER)(sp) |
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| 175 | LREG x10, (10 * CPU_SIZEOF_POINTER)(sp) |
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| 176 | LREG x11, (11 * CPU_SIZEOF_POINTER)(sp) |
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| 177 | LREG x12, (12 * CPU_SIZEOF_POINTER)(sp) |
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| 178 | LREG x13, (13 * CPU_SIZEOF_POINTER)(sp) |
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| 179 | LREG x14, (14 * CPU_SIZEOF_POINTER)(sp) |
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| 180 | LREG x15, (15 * CPU_SIZEOF_POINTER)(sp) |
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| 181 | LREG x16, (16 * CPU_SIZEOF_POINTER)(sp) |
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| 182 | LREG x17, (17 * CPU_SIZEOF_POINTER)(sp) |
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| 183 | LREG x18, (18 * CPU_SIZEOF_POINTER)(sp) |
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| 184 | LREG x19, (19 * CPU_SIZEOF_POINTER)(sp) |
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| 185 | LREG x20, (20 * CPU_SIZEOF_POINTER)(sp) |
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| 186 | LREG x21, (21 * CPU_SIZEOF_POINTER)(sp) |
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| 187 | LREG x22, (22 * CPU_SIZEOF_POINTER)(sp) |
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| 188 | LREG x23, (23 * CPU_SIZEOF_POINTER)(sp) |
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| 189 | LREG x24, (24 * CPU_SIZEOF_POINTER)(sp) |
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| 190 | LREG x25, (25 * CPU_SIZEOF_POINTER)(sp) |
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| 191 | LREG x26, (26 * CPU_SIZEOF_POINTER)(sp) |
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| 192 | LREG x27, (27 * CPU_SIZEOF_POINTER)(sp) |
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| 193 | LREG x28, (28 * CPU_SIZEOF_POINTER)(sp) |
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| 194 | LREG x29, (29 * CPU_SIZEOF_POINTER)(sp) |
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| 195 | LREG x30, (30 * CPU_SIZEOF_POINTER)(sp) |
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| 196 | |
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| 197 | LREG x31, (31 * CPU_SIZEOF_POINTER)(sp) |
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| 198 | |
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| 199 | addi sp, sp, 36 * CPU_SIZEOF_POINTER |
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| 200 | ret |
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