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annotate libs/STM32F10x_StdPeriph_Lib_V3.5.0/Project/STM32F10x_StdPeriph_Examples/FLASH/Dual_Boot/HiTOP/STM3210X-XL_BANK1/cstart_thumb2.asm @ 85:18b154c447bb

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Add note about 1-wire wiring
author Daniel O'Connor <darius@dons.net.au>
date Thu, 12 Mar 2015 23:22:11 +1030
parents c59513fd84fb
children
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1
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2
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3 ;; NOTE: To allow the use of this file for both ARMv6M and ARMv7M,
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4 ;; we will only use 16-bit Thumb intructions.
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5
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6 .extern _lc_ub_stack ; usr/sys mode stack pointer
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7 .extern _lc_ue_stack ; symbol required by debugger
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8 .extern _lc_ub_table ; ROM to RAM copy table
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9 .extern main
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10 .extern _Exit
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11 .extern exit
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12 .weak exit
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13 .global __get_argcv
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14 .weak __get_argcv
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15 .extern __argcvbuf
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16 .weak __argcvbuf
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17 .extern __init_hardware
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18 .extern __init_vector_table
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19 .extern SystemInit
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20
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21 .if @defined('__PROF_ENABLE__')
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22 .extern __prof_init
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23 .endif
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24 .if @defined('__POSIX__')
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25 .extern posix_main
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26 .extern _posix_boot_stack_top
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27 .endif
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28
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29 .global _START
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30
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31 .section .text.cstart
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32
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33 .thumb
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34 _START:
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35 ;; anticipate possible ROM/RAM remapping
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36 ;; by loading the 'real' program address
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37 ldr r1,=_Next
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38 bx r1
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39 _Next:
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40 ;; initialize the stack pointer
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41 ldr r1,=_lc_ub_stack ; TODO: make this part of the vector table
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42 mov sp,r1
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43
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44 ;; call a user function which initializes hardware
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45 ;; such as ROM/RAM re-mapping or MMU configuration
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46 bl __init_hardware
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47
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48 ;ldr r0, =SystemInit
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49 ;bx r0
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50 bl SystemInit
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51
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52 ;; copy initialized sections from ROM to RAM
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53 ;; and clear uninitialized data sections in RAM
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54
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55 ldr r3,=_lc_ub_table
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56 movs r0,#0
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57 cploop:
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58 ldr r4,[r3,#0] ; load type
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59 ldr r5,[r3,#4] ; dst address
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60 ldr r6,[r3,#8] ; src address
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61 ldr r7,[r3,#12] ; size
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62
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63 cmp r4,#1
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64 beq copy
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65 cmp r4,#2
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66 beq clear
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67 b done
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68
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69 copy:
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70 subs r7,r7,#1
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71 ldrb r1,[r6,r7]
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72 strb r1,[r5,r7]
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73 bne copy
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74
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75 adds r3,r3,#16
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76 b cploop
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77
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78 clear:
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79 subs r7,r7,#1
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80 strb r0,[r5,r7]
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81 bne clear
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82
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83 adds r3,r3,#16
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84 b cploop
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85
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86 done:
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87 ;; initialize or copy the vector table
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88 bl __init_vector_table
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89
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90 .if @defined('__POSIX__')
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91
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92 ;; posix stack buffer for system upbringing
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93 ldr r0,=_posix_boot_stack_top
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94 ldr r0, [r0]
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95 mov sp,r0
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96
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97 .else
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98
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99 ;; load r10 with end of USR/SYS stack, which is
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100 ;; needed in case stack overflow checking is on
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101 ;; NOTE: use 16-bit instructions only, for ARMv6M
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102 ldr r0,=_lc_ue_stack
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103 mov r10,r0
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104
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105 .endif
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106
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107 .if @defined('__PROF_ENABLE__')
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108 bl __prof_init
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109 .endif
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110
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111 .if @defined('__POSIX__')
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112 ;; call posix_main with no arguments
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113 bl posix_main
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114 .else
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115 ;; retrieve argc and argv (default argv[0]==NULL & argc==0)
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116 bl __get_argcv
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117 ldr r1,=__argcvbuf
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118 ;; call main
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119 bl main
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120 .endif
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121
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122 ;; call exit using the return value from main()
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123 ;; Note. Calling exit will also run all functions
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124 ;; that were supplied through atexit().
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125 bl exit
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126
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127 __get_argcv: ; weak definition
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128 movs r0,#0
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129 bx lr
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130
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131 .ltorg
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132 .endsec
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133
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134 .calls '_START','__init_hardware'
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135 .calls '_START','__init_vector_table'
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136 .if @defined('__PROF_ENABLE__')
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137 .calls '_START','__prof_init'
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138 .endif
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139 .if @defined('__POSIX__')
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140 .calls '_START','posix_main'
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141 .else
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142 .calls '_START','__get_argcv'
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143 .calls '_START','main'
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144 .endif
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145 .calls '_START','exit'
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146 .calls '_START','',0
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147
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148 .end