1 | /* SPDX-License-Identifier: BSD-2-Clause */ |
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2 | |
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3 | /** |
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4 | * @file |
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5 | * |
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6 | * @ingroup RTEMSScoreCPUARM |
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7 | * |
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8 | * @brief ARM architecture support implementation. |
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9 | */ |
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10 | |
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11 | /* |
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12 | * COPYRIGHT (c) 2000 Canon Research Centre France SA. |
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13 | * Emmanuel Raguet, mailto:raguet@crf.canon.fr |
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14 | * |
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15 | * Copyright (c) 2002 Advent Networks, Inc |
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16 | * Jay Monkman <jmonkman@adventnetworks.com> |
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17 | * |
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18 | * Copyright (c) 2007 Ray xu <rayx.cn@gmail.com> |
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19 | * |
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20 | * Copyright (c) 2009, 2017 embedded brains GmbH |
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21 | * |
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22 | * Redistribution and use in source and binary forms, with or without |
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23 | * modification, are permitted provided that the following conditions |
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24 | * are met: |
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25 | * 1. Redistributions of source code must retain the above copyright |
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26 | * notice, this list of conditions and the following disclaimer. |
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27 | * 2. Redistributions in binary form must reproduce the above copyright |
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28 | * notice, this list of conditions and the following disclaimer in the |
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29 | * documentation and/or other materials provided with the distribution. |
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30 | * |
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31 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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32 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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33 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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34 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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35 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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36 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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37 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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38 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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39 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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40 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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41 | * POSSIBILITY OF SUCH DAMAGE. |
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42 | */ |
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43 | |
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44 | #ifdef HAVE_CONFIG_H |
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45 | #include "config.h" |
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46 | #endif |
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47 | |
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48 | #include <rtems/score/cpuimpl.h> |
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49 | #include <rtems/score/thread.h> |
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50 | #include <rtems/score/tls.h> |
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51 | |
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52 | #ifdef ARM_MULTILIB_VFP |
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53 | RTEMS_STATIC_ASSERT( |
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54 | offsetof( Context_Control, register_d8 ) == ARM_CONTEXT_CONTROL_D8_OFFSET, |
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55 | ARM_CONTEXT_CONTROL_D8_OFFSET |
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56 | ); |
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57 | #endif |
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58 | |
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59 | #ifdef ARM_MULTILIB_HAS_THREAD_ID_REGISTER |
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60 | RTEMS_STATIC_ASSERT( |
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61 | offsetof( Context_Control, thread_id ) |
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62 | == ARM_CONTEXT_CONTROL_THREAD_ID_OFFSET, |
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63 | ARM_CONTEXT_CONTROL_THREAD_ID_OFFSET |
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64 | ); |
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65 | #endif |
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66 | |
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67 | #ifdef ARM_MULTILIB_ARCH_V4 |
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68 | RTEMS_STATIC_ASSERT( |
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69 | offsetof( Context_Control, isr_dispatch_disable ) |
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70 | == ARM_CONTEXT_CONTROL_ISR_DISPATCH_DISABLE, |
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71 | ARM_CONTEXT_CONTROL_ISR_DISPATCH_DISABLE |
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72 | ); |
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73 | #endif |
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74 | |
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75 | #ifdef RTEMS_SMP |
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76 | RTEMS_STATIC_ASSERT( |
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77 | offsetof( Context_Control, is_executing ) |
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78 | == ARM_CONTEXT_CONTROL_IS_EXECUTING_OFFSET, |
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79 | ARM_CONTEXT_CONTROL_IS_EXECUTING_OFFSET |
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80 | ); |
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81 | #endif |
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82 | |
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83 | RTEMS_STATIC_ASSERT( |
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84 | sizeof( CPU_Exception_frame ) == ARM_EXCEPTION_FRAME_SIZE, |
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85 | ARM_EXCEPTION_FRAME_SIZE |
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86 | ); |
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87 | |
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88 | RTEMS_STATIC_ASSERT( |
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89 | sizeof( CPU_Exception_frame ) % CPU_STACK_ALIGNMENT == 0, |
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90 | CPU_Exception_frame_alignment |
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91 | ); |
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92 | |
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93 | RTEMS_STATIC_ASSERT( |
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94 | offsetof( CPU_Exception_frame, register_sp ) |
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95 | == ARM_EXCEPTION_FRAME_REGISTER_SP_OFFSET, |
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96 | ARM_EXCEPTION_FRAME_REGISTER_SP_OFFSET |
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97 | ); |
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98 | |
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99 | RTEMS_STATIC_ASSERT( |
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100 | sizeof( ARM_VFP_context ) == ARM_VFP_CONTEXT_SIZE, |
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101 | ARM_VFP_CONTEXT_SIZE |
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102 | ); |
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103 | |
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104 | #ifdef ARM_MULTILIB_ARCH_V4 |
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105 | |
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106 | void _CPU_Context_Initialize( |
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107 | Context_Control *the_context, |
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108 | void *stack_area_begin, |
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109 | size_t stack_area_size, |
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110 | uint32_t new_level, |
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111 | void (*entry_point)( void ), |
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112 | bool is_fp, |
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113 | void *tls_area |
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114 | ) |
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115 | { |
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116 | (void) new_level; |
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117 | |
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118 | the_context->register_sp = (uint32_t) stack_area_begin + stack_area_size; |
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119 | the_context->register_lr = (uint32_t) entry_point; |
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120 | the_context->isr_dispatch_disable = 0; |
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121 | |
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122 | #ifdef ARM_MULTILIB_HAS_THREAD_ID_REGISTER |
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123 | the_context->thread_id = (uint32_t) tls_area; |
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124 | #endif |
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125 | |
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126 | if ( tls_area != NULL ) { |
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127 | _TLS_TCB_at_area_begin_initialize( tls_area ); |
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128 | } |
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129 | } |
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130 | |
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131 | void _CPU_ISR_Set_level( uint32_t level ) |
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132 | { |
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133 | uint32_t arm_switch_reg; |
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134 | |
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135 | /* Ignore the level parameter and just enable interrupts */ |
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136 | (void) level; |
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137 | |
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138 | __asm__ volatile ( |
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139 | ARM_SWITCH_TO_ARM |
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140 | "mrs %[arm_switch_reg], cpsr\n" |
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141 | "bic %[arm_switch_reg], #" RTEMS_XSTRING( ARM_PSR_I ) "\n" |
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142 | "msr cpsr, %0\n" |
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143 | ARM_SWITCH_BACK |
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144 | : [arm_switch_reg] "=&r" (arm_switch_reg) |
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145 | ); |
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146 | } |
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147 | |
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148 | uint32_t _CPU_ISR_Get_level( void ) |
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149 | { |
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150 | ARM_SWITCH_REGISTERS; |
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151 | uint32_t level; |
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152 | |
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153 | __asm__ volatile ( |
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154 | ARM_SWITCH_TO_ARM |
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155 | "mrs %[level], cpsr\n" |
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156 | "and %[level], #" RTEMS_XSTRING( ARM_PSR_I ) "\n" |
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157 | ARM_SWITCH_BACK |
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158 | : [level] "=&r" (level) ARM_SWITCH_ADDITIONAL_OUTPUT |
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159 | ); |
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160 | |
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161 | return ( level & ARM_PSR_I ) != 0; |
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162 | } |
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163 | |
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164 | void _CPU_ISR_install_vector( |
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165 | uint32_t vector, |
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166 | CPU_ISR_handler new_handler, |
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167 | CPU_ISR_handler *old_handler |
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168 | ) |
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169 | { |
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170 | #pragma GCC diagnostic push |
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171 | #pragma GCC diagnostic ignored "-Warray-bounds" |
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172 | /* Redirection table starts at the end of the vector table */ |
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173 | CPU_ISR_handler volatile *table = (CPU_ISR_handler *) (MAX_EXCEPTIONS * 4); |
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174 | |
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175 | CPU_ISR_handler current_handler = table [vector]; |
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176 | |
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177 | /* The current handler is now the old one */ |
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178 | if (old_handler != NULL) { |
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179 | *old_handler = current_handler; |
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180 | } |
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181 | |
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182 | /* Write only if necessary to avoid writes to a maybe read-only memory */ |
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183 | if (current_handler != new_handler) { |
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184 | table [vector] = new_handler; |
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185 | } |
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186 | #pragma GCC diagnostic pop |
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187 | } |
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188 | |
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189 | void _CPU_Initialize( void ) |
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190 | { |
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191 | /* Do nothing */ |
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192 | } |
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193 | |
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194 | #endif /* ARM_MULTILIB_ARCH_V4 */ |
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195 | |
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196 | void _CPU_Fatal_halt( uint32_t source, CPU_Uint32ptr error ) |
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197 | { |
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198 | ISR_Level level; |
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199 | |
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200 | _CPU_ISR_Disable( level ); |
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201 | (void) level; |
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202 | |
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203 | __asm__ volatile ("mov r0, %0\n" |
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204 | : "=r" (error) |
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205 | : "0" (error) |
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206 | : "r0" ); |
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207 | |
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208 | while ( true ) { |
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209 | /* Do nothing */ |
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210 | } |
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211 | } |
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