[16] | 1 | /* |
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[279] | 2 | * hal_kentry.S - Interrupt / Exception / Syscall kernel entry point for MIPS32 |
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[16] | 3 | * |
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| 4 | * AUthors Ghassan Almaless (2007,2008,2009,2010,2011,2012) |
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| 5 | * Mohamed Lamine Karaoui (2015) |
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| 6 | * Alain Greiner (2017) |
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| 7 | * |
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| 8 | * Copyright (c) UPMC Sorbonne Universites |
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| 9 | * |
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| 10 | * This file is part of ALMOS-MKH. |
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| 11 | * |
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| 12 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
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| 13 | * under the terms of the GNU General Public License as published by |
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| 14 | * the Free Software Foundation; version 2.0 of the License. |
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| 15 | * |
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| 16 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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| 17 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 19 | * General Public License for more details. |
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| 20 | * |
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| 21 | * You should have received a copy of the GNU General Public License |
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| 22 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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| 23 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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| 24 | */ |
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| 25 | |
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[406] | 26 | #define UZ_MODE 0 |
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| 27 | #define UZ_AT 1 |
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| 28 | #define UZ_V0 2 |
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| 29 | #define UZ_V1 3 |
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| 30 | #define UZ_A0 4 |
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| 31 | #define UZ_A1 5 |
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| 32 | #define UZ_A2 6 |
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| 33 | #define UZ_A3 7 |
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| 34 | #define UZ_T0 8 |
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| 35 | #define UZ_T1 9 |
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| 36 | #define UZ_T2 10 |
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| 37 | #define UZ_T3 11 |
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| 38 | #define UZ_T4 12 |
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| 39 | #define UZ_T5 13 |
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| 40 | #define UZ_T6 14 |
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| 41 | #define UZ_T7 15 |
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[408] | 42 | #define UZ_S0 16 |
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| 43 | #define UZ_S1 17 |
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| 44 | #define UZ_S2 18 |
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| 45 | #define UZ_S3 19 |
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| 46 | #define UZ_S4 20 |
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| 47 | #define UZ_S5 21 |
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| 48 | #define UZ_S6 22 |
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| 49 | #define UZ_S7 23 |
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| 50 | #define UZ_T8 24 |
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| 51 | #define UZ_T9 25 |
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[16] | 52 | |
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[408] | 53 | #define UZ_LO 26 |
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| 54 | #define UZ_HI 27 |
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[16] | 55 | |
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[408] | 56 | #define UZ_GP 28 |
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| 57 | #define UZ_SP 29 |
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| 58 | #define UZ_S8 30 |
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| 59 | #define UZ_RA 31 |
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| 60 | #define UZ_PTPR 32 |
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| 61 | #define UZ_EPC 33 |
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| 62 | #define UZ_SR 34 |
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| 63 | #define UZ_TH 35 |
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| 64 | #define UZ_CR 36 |
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| 65 | |
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| 66 | #define UZ_REGS 37 |
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| 67 | |
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[406] | 68 | #include <kernel_config.h> |
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| 69 | |
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[296] | 70 | .section .kentry, "ax", @progbits |
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[279] | 71 | |
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| 72 | .extern hal_do_interrupt |
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| 73 | .extern hal_do_exception |
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| 74 | .extern hal_do_syscall |
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[408] | 75 | .extern puts |
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| 76 | .extern putx |
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| 77 | .extern putl |
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[279] | 78 | |
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[16] | 79 | .org 0x180 |
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[279] | 80 | |
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[406] | 81 | .global hal_kentry_enter |
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| 82 | .global hal_kentry_eret |
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| 83 | |
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[16] | 84 | .set noat |
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| 85 | .set noreorder |
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| 86 | |
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[408] | 87 | #------------------------------------------------------------------------------------ |
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[279] | 88 | # Kernel Entry point for Interrupt / Exception / Syscall |
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[406] | 89 | # The c2_dext and c2_iext CP2 registers must have been previously set |
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| 90 | # to "local_cxy", because the kernel run with MMU desactivated. |
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[408] | 91 | #------------------------------------------------------------------------------------ |
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[16] | 92 | |
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[406] | 93 | hal_kentry_enter: |
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| 94 | |
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| 95 | mfc0 $26, $12 # get c0_sr |
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| 96 | andi $26, $26, 0x10 # test User Mode bit |
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| 97 | beq $26, $0, kernel_mode # jump if core already in kernel |
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| 98 | ori $27, $0, 0x3 # $27 <= code for MMU OFF |
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[16] | 99 | |
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[408] | 100 | #------------------------------------------------------------------------------------ |
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[418] | 101 | # This code is executed when the core is in user mode, |
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| 102 | # to handle a syscall, an interrupt, or an user exception. |
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[406] | 103 | # - save current c2_mode in $26. |
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| 104 | # - set MMU OFF. |
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[418] | 105 | # - copy user stack pointer in $27 to be saved in uzone. |
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| 106 | # - set kernel stack pointer in $29 == top_kernel_stack(this). |
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[16] | 107 | |
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| 108 | user_mode: |
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| 109 | |
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[406] | 110 | mfc2 $26, $1 # $26 <= c2_mode |
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| 111 | mtc2 $27, $1 # set MMU OFF |
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| 112 | move $27, $29 # $27 <= user stack pointer |
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| 113 | mfc0 $29, $4, 2 # get pointer on thread descriptor from c0_th |
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[408] | 114 | addi $29, $29, CONFIG_THREAD_DESC_SIZE |
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| 115 | addi $29, $29, -8 # $29 <= kernel stack pointer |
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[406] | 116 | j unified_mode |
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| 117 | nop |
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[16] | 118 | |
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[408] | 119 | #------------------------------------------------------------------------------------ |
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[418] | 120 | # This code is executed when the core is already in kernel mode, |
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[425] | 121 | # after a syscall, to handle an interrupt, or to handle a non-fatal exception. |
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[406] | 122 | # - save current c2_mode in $26. |
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| 123 | # - set MMU OFF. |
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[418] | 124 | # - copy current kernel stack pointer in $27. |
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[16] | 125 | |
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| 126 | kernel_mode: |
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| 127 | |
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[406] | 128 | mfc2 $26, $1 # $26 <= c2_mode |
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[16] | 129 | mtc2 $27, $1 # set MMU OFF |
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[406] | 130 | move $27, $29 # $27 <= current kernel stack pointer |
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[16] | 131 | |
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[408] | 132 | #------------------------------------------------------------------------------------ |
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[406] | 133 | # This code is executed in both modes (user or kernel): |
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| 134 | # The assumptions are: |
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| 135 | # - c2_mode contains the MMU OFF value. |
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| 136 | # - $26 contains the previous c2_mode value. |
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| 137 | # - $27 contains the previous sp value (can be usp or ksp). |
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[418] | 138 | # - $29 contains the curren kernel stack pointer. |
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[406] | 139 | # We execute the following actions: |
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[418] | 140 | # - decrement $29 to allocate an uzone in kernel stack |
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[408] | 141 | # - save relevant GPR, CP0 and CP2 registers to uzone. |
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[406] | 142 | # - set the SR in kernel mode: IRQ disabled, clear exl. |
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[16] | 143 | |
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[406] | 144 | unified_mode: |
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[16] | 145 | |
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[406] | 146 | addiu $29, $29, -(UZ_REGS*4) # allocate uzone in kernel stack |
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[16] | 147 | |
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[406] | 148 | sw $1, (UZ_AT*4)($29) |
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| 149 | sw $2, (UZ_V0*4)($29) |
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| 150 | sw $3, (UZ_V1*4)($29) |
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| 151 | sw $4, (UZ_A0*4)($29) |
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| 152 | sw $5, (UZ_A1*4)($29) |
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| 153 | sw $6, (UZ_A2*4)($29) |
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| 154 | sw $7, (UZ_A3*4)($29) |
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| 155 | sw $8, (UZ_T0*4)($29) |
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| 156 | sw $9, (UZ_T1*4)($29) |
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| 157 | sw $10, (UZ_T2*4)($29) |
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| 158 | sw $11, (UZ_T3*4)($29) |
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| 159 | sw $12, (UZ_T4*4)($29) |
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| 160 | sw $13, (UZ_T5*4)($29) |
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| 161 | sw $14, (UZ_T6*4)($29) |
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| 162 | sw $15, (UZ_T7*4)($29) |
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| 163 | sw $16, (UZ_S0*4)($29) |
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| 164 | sw $17, (UZ_S1*4)($29) |
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| 165 | sw $18, (UZ_S2*4)($29) |
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| 166 | sw $19, (UZ_S3*4)($29) |
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| 167 | sw $20, (UZ_S4*4)($29) |
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| 168 | sw $21, (UZ_S5*4)($29) |
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| 169 | sw $22, (UZ_S6*4)($29) |
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| 170 | sw $23, (UZ_S7*4)($29) |
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| 171 | sw $24, (UZ_T8*4)($29) |
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| 172 | sw $25, (UZ_T9*4)($29) |
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[16] | 173 | |
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[408] | 174 | mflo $1 |
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| 175 | sw $1, (UZ_LO*4)($29) # save lo |
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| 176 | mflo $1 |
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| 177 | sw $1, (UZ_HI*4)($29) # save hi |
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[16] | 178 | |
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[408] | 179 | sw $28, (UZ_GP*4)($29) # save gp |
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| 180 | sw $27, (UZ_SP*4)($29) # save previous sp (can be usp or ksp) |
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| 181 | sw $30, (UZ_S8*4)($29) # save s8 |
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| 182 | sw $31, (UZ_RA*4)($29) # save ra |
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[16] | 183 | |
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[408] | 184 | mfc0 $1, $14 |
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| 185 | sw $1, (UZ_EPC*4)($29) # save c0_epc |
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| 186 | mfc0 $1, $12 |
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| 187 | sw $1, (UZ_SR*4)($29) # save c0_sr |
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| 188 | mfc0 $1, $4, 2 |
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| 189 | sw $1, (UZ_TH*4)($29) # save c0_th |
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| 190 | mfc0 $1, $13 |
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| 191 | sw $1, (UZ_CR*4)($29) # save c0_cr |
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| 192 | mfc2 $1, $0 |
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| 193 | sw $1, (UZ_PTPR*4)($29) # save c2_ptpr |
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[16] | 194 | |
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[408] | 195 | sw $26, (UZ_MODE*4)($29) # save previous c2_mode (can be user or kernel) |
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[16] | 196 | |
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[408] | 197 | mfc0 $3, $12 |
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| 198 | srl $3, $3, 5 |
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| 199 | sll $3, $3, 5 # reset 5 LSB bits |
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| 200 | mtc0 $3, $12 # set new c0_sr |
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| 201 | |
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[438] | 202 | #-------------------- |
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| 203 | #if DEBUG_HAL_KENTRY |
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[408] | 204 | |
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| 205 | # display "enter" message |
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| 206 | la $4, msg_enter |
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| 207 | jal puts |
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| 208 | nop |
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| 209 | move $4, $29 |
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| 210 | jal putx |
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| 211 | nop |
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[418] | 212 | la $4, msg_cycle |
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| 213 | jal puts |
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| 214 | nop |
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| 215 | jal hal_time_stamp |
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| 216 | nop |
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| 217 | move $4, $2 |
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| 218 | jal putx |
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| 219 | nop |
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[408] | 220 | la $4, msg_crlf |
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| 221 | jal puts |
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| 222 | nop |
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| 223 | # display saved SP value |
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| 224 | la $4, msg_sp |
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| 225 | jal puts |
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| 226 | nop |
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| 227 | lw $4, (UZ_SP*4)($29) |
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| 228 | jal putx |
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| 229 | nop |
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| 230 | la $4, msg_crlf |
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| 231 | jal puts |
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| 232 | nop |
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| 233 | # display saved RA value |
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| 234 | la $4, msg_ra |
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| 235 | jal puts |
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| 236 | nop |
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| 237 | lw $4, (UZ_RA*4)($29) |
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| 238 | jal putx |
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| 239 | nop |
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| 240 | la $4, msg_crlf |
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| 241 | jal puts |
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| 242 | nop |
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| 243 | # display saved TH value |
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| 244 | la $4, msg_th |
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| 245 | jal puts |
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| 246 | nop |
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| 247 | lw $4, (UZ_TH*4)($29) |
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| 248 | jal putx |
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| 249 | nop |
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| 250 | la $4, msg_crlf |
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| 251 | jal puts |
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| 252 | nop |
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| 253 | # display saved EPC value |
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| 254 | la $4, msg_epc |
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| 255 | jal puts |
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| 256 | nop |
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| 257 | lw $4, (UZ_EPC*4)($29) |
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| 258 | jal putx |
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| 259 | nop |
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| 260 | la $4, msg_crlf |
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| 261 | jal puts |
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| 262 | nop |
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| 263 | # display saved MODE value |
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| 264 | la $4, msg_mode |
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| 265 | jal puts |
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| 266 | nop |
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| 267 | lw $4, (UZ_MODE*4)($29) |
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| 268 | jal putx |
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| 269 | nop |
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| 270 | la $4, msg_crlf |
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| 271 | jal puts |
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| 272 | nop |
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| 273 | # display saved V0 value |
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| 274 | la $4, msg_v0 |
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| 275 | jal puts |
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| 276 | nop |
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| 277 | lw $4, (UZ_V0*4)($29) |
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| 278 | jal putx |
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| 279 | nop |
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| 280 | la $4, msg_crlf |
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| 281 | jal puts |
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| 282 | nop |
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[418] | 283 | |
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[408] | 284 | #endif |
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[418] | 285 | #----- |
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[408] | 286 | |
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| 287 | #------------------------------------------------------------------------------------ |
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[425] | 288 | # This code handle the uzone pointers stack, and calls the relevant |
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| 289 | # Interrupt / Exception / Syscall handler, depending on XCODE in CP0_CR. |
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| 290 | # Both the hal_do_syscall() and the hal_do_exception() functions use |
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| 291 | # the values saved in the "uzone", but a syscall can be interrupted |
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| 292 | # by an interrupt, or by a non-fatal exception. Therefore, we need |
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| 293 | # to handle a two-slots "stack of uzones", implemented in the kernel stack, |
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| 294 | # using the two "current_uzone" and "previous_uzone" pointers in thread descriptor. |
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| 295 | # - at kernel_entry, we copy the "current_uzone" pointer to the "previous_uzone" |
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| 296 | # slot, and copy the "$29" stack pointer to the "current_uzone" slot. |
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| 297 | # - at kernel_exit, we simply restore the "previous_uzone" value to the |
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| 298 | # "current_uzone" slot. |
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| 299 | # For a syscall, the hal_do_syscall() function increment the uzone[EPC] |
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| 300 | # slot and set the return value in the uzone[V0] slot before returning. |
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[16] | 301 | |
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[425] | 302 | # update "current_uzone" and "previous_uzone" pointers |
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| 303 | mfc0 $4, $4, 2 # $4 <= pointer on thread desc |
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| 304 | lw $5, 8($4) # $5 <= current uzone pointer trom thread |
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| 305 | sw $29, 8($4) # current uzone pointer <= $29 |
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| 306 | sw $5, 12($4) # previous uzone pointer <= current |
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| 307 | |
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| 308 | # analyse XCODE to call relevant handler |
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[296] | 309 | mfc0 $17, $13 # $17 <= CR |
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[425] | 310 | andi $17, $17, 0x3F # $17 <= XCODE |
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[408] | 311 | ori $8, $0, 0x20 |
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[296] | 312 | beq $8, $17, cause_sys # go to syscall handler |
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[16] | 313 | nop |
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[296] | 314 | beq $17, $0, cause_int # go to interrupt handler |
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[16] | 315 | nop |
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| 316 | |
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| 317 | cause_excp: |
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[425] | 318 | |
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[408] | 319 | jal hal_do_exception # call exception handler |
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| 320 | nop |
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[406] | 321 | j kentry_exit # jump to kentry_exit |
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[16] | 322 | nop |
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| 323 | |
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| 324 | cause_sys: |
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[425] | 325 | |
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[408] | 326 | jal hal_do_syscall # call syscall handler |
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| 327 | nop |
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[406] | 328 | j kentry_exit # jump to kentry_exit |
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[279] | 329 | nop |
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[16] | 330 | |
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| 331 | cause_int: |
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[425] | 332 | |
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[408] | 333 | jal hal_do_interrupt # call interrupt handler |
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| 334 | nop |
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[16] | 335 | |
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| 336 | # ----------------------------------------------------------------------------------- |
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[279] | 337 | # Kernel exit |
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[418] | 338 | # - All registers saved in the uzone are restored, using the pointer on uzone, |
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| 339 | # that is contained in $29. |
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| 340 | # - The "uzone" field in thread descriptor, that has beeen modified at kernel entry |
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| 341 | # is restored from value contained in the uzone[UZ_SP] slot. |
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[16] | 342 | # ----------------------------------------------------------------------------------- |
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[418] | 343 | |
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[406] | 344 | kentry_exit: |
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[16] | 345 | |
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[425] | 346 | # restore "current_uzone" pointer |
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| 347 | mfc0 $4, $4, 2 # $4 <= pointer on thread desc |
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| 348 | lw $5, 12($4) # $5 <= previous uzone pointer from thread |
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| 349 | sw $5, 8($4) # current uzone pointer <= previous |
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| 350 | |
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[438] | 351 | #------------------- |
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| 352 | #if DEBUG_HAL_KENTRY |
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[408] | 353 | |
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| 354 | # display "exit" message |
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| 355 | la $4, msg_exit |
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| 356 | jal puts |
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| 357 | nop |
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| 358 | move $4, $29 |
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| 359 | jal putx |
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| 360 | nop |
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[418] | 361 | la $4, msg_cycle |
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| 362 | jal puts |
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| 363 | nop |
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| 364 | jal hal_time_stamp |
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| 365 | nop |
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| 366 | move $4, $2 |
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| 367 | jal putx |
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| 368 | nop |
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[408] | 369 | la $4, msg_crlf |
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| 370 | jal puts |
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| 371 | nop |
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| 372 | # display saved SP value |
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| 373 | la $4, msg_sp |
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| 374 | jal puts |
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| 375 | nop |
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| 376 | lw $4, (UZ_SP*4)($29) |
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| 377 | jal putx |
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| 378 | nop |
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| 379 | la $4, msg_crlf |
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| 380 | jal puts |
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| 381 | nop |
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| 382 | # display saved RA value |
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| 383 | la $4, msg_ra |
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| 384 | jal puts |
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| 385 | nop |
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| 386 | lw $4, (UZ_RA*4)($29) |
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| 387 | jal putx |
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| 388 | nop |
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| 389 | la $4, msg_crlf |
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| 390 | jal puts |
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| 391 | nop |
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| 392 | # display saved TH value |
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| 393 | la $4, msg_th |
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| 394 | jal puts |
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| 395 | nop |
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| 396 | lw $4, (UZ_TH*4)($29) |
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| 397 | jal putx |
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| 398 | nop |
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| 399 | la $4, msg_crlf |
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| 400 | jal puts |
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| 401 | nop |
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| 402 | # display saved EPC value |
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| 403 | la $4, msg_epc |
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| 404 | jal puts |
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| 405 | nop |
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| 406 | lw $4, (UZ_EPC*4)($29) |
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| 407 | jal putx |
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| 408 | nop |
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| 409 | la $4, msg_crlf |
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| 410 | jal puts |
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| 411 | nop |
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| 412 | # display saved MODE value |
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| 413 | la $4, msg_mode |
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| 414 | jal puts |
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| 415 | nop |
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| 416 | lw $4, (UZ_MODE*4)($29) |
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| 417 | jal putx |
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| 418 | nop |
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| 419 | la $4, msg_crlf |
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| 420 | jal puts |
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| 421 | nop |
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| 422 | # display saved V0 value |
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| 423 | la $4, msg_v0 |
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| 424 | jal puts |
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| 425 | nop |
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| 426 | lw $4, (UZ_V0*4)($29) |
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| 427 | jal putx |
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| 428 | nop |
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| 429 | la $4, msg_crlf |
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| 430 | jal puts |
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| 431 | nop |
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| 432 | |
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| 433 | #endif |
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[418] | 434 | #----- |
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[408] | 435 | |
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[406] | 436 | # restore registers from uzone |
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[408] | 437 | or $27, $0, $29 # $27 <= ksp (contains &uzone) |
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[16] | 438 | |
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[408] | 439 | lw $1, (UZ_EPC*4)($27) |
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| 440 | mtc0 $1, $14 # restore c0_epc from uzone |
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| 441 | lw $1, (UZ_SR*4)($27) |
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| 442 | mtc0 $1, $12 # restore c0_sr from uzone |
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[16] | 443 | |
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[408] | 444 | lw $26, (UZ_HI*4)($27) |
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| 445 | mthi $26 # restore hi from uzone |
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| 446 | lw $26, (UZ_LO*4)($27) |
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| 447 | mtlo $26 # restore lo from uzone |
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[16] | 448 | |
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| 449 | lw $1, (UZ_AT*4)($27) |
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[408] | 450 | lw $2, (UZ_V0*4)($27) |
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| 451 | lw $3, (UZ_V1*4)($27) |
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[16] | 452 | lw $4, (UZ_A0*4)($27) |
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| 453 | lw $5, (UZ_A1*4)($27) |
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| 454 | lw $6, (UZ_A2*4)($27) |
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| 455 | lw $7, (UZ_A3*4)($27) |
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| 456 | lw $8, (UZ_T0*4)($27) |
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| 457 | lw $9, (UZ_T1*4)($27) |
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| 458 | lw $10, (UZ_T2*4)($27) |
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| 459 | lw $11, (UZ_T3*4)($27) |
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| 460 | lw $12, (UZ_T4*4)($27) |
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| 461 | lw $13, (UZ_T5*4)($27) |
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| 462 | lw $14, (UZ_T6*4)($27) |
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| 463 | lw $15, (UZ_T7*4)($27) |
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| 464 | lw $16, (UZ_S0*4)($27) |
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| 465 | lw $17, (UZ_S1*4)($27) |
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| 466 | lw $18, (UZ_S2*4)($27) |
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| 467 | lw $19, (UZ_S3*4)($27) |
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| 468 | lw $20, (UZ_S4*4)($27) |
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| 469 | lw $21, (UZ_S5*4)($27) |
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| 470 | lw $22, (UZ_S6*4)($27) |
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| 471 | lw $23, (UZ_S7*4)($27) |
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| 472 | lw $24, (UZ_T8*4)($27) |
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| 473 | lw $25, (UZ_T9*4)($27) |
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| 474 | |
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[408] | 475 | lw $28, (UZ_GP*4)($27) # restore gp_28 from uzone |
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| 476 | lw $29, (UZ_SP*4)($27) # restore sp_29 from uzone |
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| 477 | lw $30, (UZ_S8*4)($27) # restore s8_30 from uzone |
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| 478 | lw $31, (UZ_RA*4)($27) # restore ra_31 from uzone |
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| 479 | |
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[279] | 480 | lw $26, (UZ_MODE*4)($27) |
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| 481 | mtc2 $26, $1 # restore CP2_MODE from uzone |
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[16] | 482 | |
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[406] | 483 | # ----------------------------------------------------------------------------------- |
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| 484 | # eret function |
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| 485 | # ----------------------------------------------------------------------------------- |
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| 486 | |
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| 487 | hal_kentry_eret: |
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[408] | 488 | eret # jump to EPC, reset EXL bit |
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[16] | 489 | |
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| 490 | .set reorder |
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| 491 | .set at |
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| 492 | |
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[406] | 493 | #------------------------------------------------------------------------------------ |
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[408] | 494 | .section .kdata |
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[16] | 495 | |
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[408] | 496 | msg_sp: |
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| 497 | .align 2 |
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| 498 | .asciiz "- UZ_SP = " |
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| 499 | msg_ra: |
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| 500 | .align 2 |
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| 501 | .asciiz "- UZ_RA = " |
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| 502 | msg_epc: |
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| 503 | .align 2 |
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| 504 | .asciiz "- UZ_EPC = " |
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| 505 | msg_th: |
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| 506 | .align 2 |
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| 507 | .asciiz "- UZ_TH = " |
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| 508 | msg_mode: |
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| 509 | .align 2 |
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| 510 | .asciiz "- UZ_MODE = " |
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| 511 | msg_v0: |
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| 512 | .align 2 |
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| 513 | .asciiz "- UZ_V0 = " |
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| 514 | msg_crlf: |
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| 515 | .align 2 |
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| 516 | .asciiz "\n" |
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| 517 | msg_enter: |
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| 518 | .align 2 |
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| 519 | .asciiz "\nenter kernel : &uzone = " |
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| 520 | msg_exit: |
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| 521 | .align 2 |
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| 522 | .asciiz "\nexit kernel : &uzone = " |
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[418] | 523 | msg_cycle: |
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| 524 | .align 2 |
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| 525 | .asciiz " / cycle = " |
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[408] | 526 | |
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