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drivers
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startup_gcc.S

startup_gcc.S 2.9 KB
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  1. /*
    2. 

  2.  * Copyright (C) 2017-2019 Alibaba Group Holding Limited
    3. 

  3.  *
    4. 

  4.  * SPDX-License-Identifier: Apache-2.0
    5. 

  5.  *
    6. 

  6.  * Change Logs:
    7. 

  7.  * Date           Author       Notes
    8. 

  8.  * 2020-08-20     zx.chen      startup file. Should use with
    9. 

  9.  *          		       GCC for T-HEAD Embedded Processors
    10. 

  10.  */
    11. 

  11. 

  12. #include <csi_config.h>
    13. 

  13. 

  14. 

  15. .section .vectors, "aw", @progbits
    16. 

  16.     .align  6
    17. 

  17.     .globl  __Vectors
    18. 

  18.     .type   __Vectors, @object
    19. 

  19. __Vectors:
    20. 

  20.     .long   Default_Handler
    21. 

  21.     .long   Default_Handler
    22. 

  22.     .long   Default_Handler
    23. 

  23.     .long   PendSV_Handler
    24. 

  24.     .long   Default_Handler
    25. 

  25.     .long   Default_Handler
    26. 

  26.     .long   Default_Handler
    27. 

  27.     .long   SysTick_Handler
    28. 

  28.     .long   Default_Handler
    29. 

  29.     .long   Default_Handler
    30. 

  30.     .long   Default_Handler
    31. 

  31.     .long   Default_Handler
    32. 

  32.     .long   Default_Handler
    33. 

  33.     .long   Default_Handler
    34. 

  34.     .long   Default_Handler
    35. 

  35.     .long   Default_Handler
    36. 

  36. 

  37.     /* External interrupts */
    38. 

  38.     .long   USART_IRQHandler
    39. 

  39.     .long   Default_Handler
    40. 

  40.     .long   TIM0_IRQHandler
    41. 

  41.     .long   Default_Handler
    42. 

  42.     .long   Default_Handler
    43. 

  43.     .long   Default_Handler
    44. 

  44.     .long   Default_Handler
    45. 

  45.     .long   Default_Handler
    46. 

  46.     .long   Default_Handler
    47. 

  47.     .long   Default_Handler
    48. 

  48.     .long   Default_Handler
    49. 

  49.     .long   Default_Handler
    50. 

  50.     .long   Default_Handler
    51. 

  51.     .long   Default_Handler
    52. 

  52.     .long   Default_Handler
    53. 

  53.     .long   Default_Handler
    54. 

  54.     .long   Default_Handler
    55. 

  55.     .long   Default_Handler
    56. 

  56.     .long   Default_Handler
    57. 

  57.     .long   Default_Handler
    58. 

  58.     .long   Default_Handler
    59. 

  59.     .long   Default_Handler
    60. 

  60.     .long   Default_Handler
    61. 

  61.     .long   Default_Handler
    62. 

  62.     .long   Default_Handler
    63. 

  63.     .long   Default_Handler
    64. 

  64.     .long   Default_Handler
    65. 

  65.     .long   Default_Handler
    66. 

  66.     .long   Default_Handler
    67. 

  67.     .long   Default_Handler
    68. 

  68.     .long   Default_Handler
    69. 

  69.     .long   Default_Handler
    70. 

  70.     .size __Vectors,.-__Vectors
    71. 

  71. 

  72.     .text
    73. 

  73.     .align  2
    74. 

  74. _start:
    75. 

  75.     .text
    76. 

  76.     .align  2
    77. 

  77.     .globl  Reset_Handler
    78. 

  78.     .type   Reset_Handler, %function
    79. 

  79. Reset_Handler:
    80. 

  80. .option push
    81. 

  81. .option norelax
    82. 

  82.     la      gp, __global_pointer$
    83. 

  83. .option pop
    84. 

  84.     la      a0, Default_Handler
    85. 

  85.     ori     a0, a0, 3
    86. 

  86.     csrw    mtvec, a0
    87. 

  87.     la      a0, __Vectors
    88. 

  88.     csrw    mtvt, a0
    89. 

  89.     la      sp, __StackTop
    90. 

  90.     csrw    mscratch, sp
    91. 

  91. 

  92.     /* Load data section */
    93. 

  93.     la      a0, __erodata
    94. 

  94.     la      a1, __data_start__
    95. 

  95.     la      a2, __data_end__
    96. 

  96.     bgeu    a1, a2, 2f
    97. 

  97. 1:
    98. 

  98.     lw      t0, (a0)
    99. 

  99.     sw      t0, (a1)
    100. 

  100.     addi    a0, a0, 4
    101. 

  101.     addi    a1, a1, 4
    102. 

  102.     bltu    a1, a2, 1b
    103. 

  103. 2:
    104. 

  104. 

  105.     /* Clear bss section */
    106. 

  106.     la      a0, __bss_start__
    107. 

  107.     la      a1, __bss_end__
    108. 

  108.     bgeu    a0, a1, 2f
    109. 

  109. 1:
    110. 

  110.     sw      zero, (a0)
    111. 

  111.     addi    a0, a0, 4
    112. 

  112.     bltu    a0, a1, 1b
    113. 

  113. 2:
    114. 

  114. 

  115. #ifndef __NO_SYSTEM_INIT
    116. 

  116.     jal     SystemInit
    117. 

  117. #endif
    118. 

  118. 

  119.     jal     entry
    120. 

  120. 

  121.     .size   Reset_Handler, . - Reset_Handler
    122. 

  122. 

  123. __exit:
    124. 

  124.     j      __exit
    125. 

  125. 

  126. .section .bss
    127. 

  127. 

  128.     .align  3
    129. 

  129.     .global g_base_irqstack
    130. 

  130.     .global g_top_irqstack
    131. 

  131. g_base_irqstack:
    132. 

  132.     .space CONFIG_ARCH_INTERRUPTSTACK
    133. 

  133. g_top_irqstack:
    134.