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<div class="title">start.S</div> </div>
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<a href="boot_2arm_2uboot_2start_8S.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> /*-</div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span>  * Copyright (c) 2008 Semihalf, Rafal Czubak</div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span>  * All rights reserved.</div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span>  *</div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span>  * Redistribution and use in source and binary forms, with or without</div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span>  * modification, are permitted provided that the following conditions</div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span>  * are met:</div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>  * 1. Redistributions of source code must retain the above copyright</div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>  * notice, this list of conditions and the following disclaimer.</div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>  * 2. Redistributions in binary form must reproduce the above copyright</div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>  * notice, this list of conditions and the following disclaimer in the</div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>  * documentation and/or other materials provided with the distribution.</div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>  *</div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span>  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND</div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE</div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE</div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE</div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL</div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS</div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)</div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT</div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY</div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF</div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  * SUCH DAMAGE.</div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  *</div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  * $FreeBSD: releng/10.2/sys/boot/arm/uboot/start.S 283505 2015-05-25 01:06:55Z ian $</div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  */</div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> </div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> #include <machine/asm.h></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> #include <machine/armreg.h></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> </div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  .text</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  .extern _C_LABEL(self_reloc), _C_LABEL(main)</div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  .weak _DYNAMIC</div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> </div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> /*</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  * Entry point to the loader that U-Boot passes control to.</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  */</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  .globl _start</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> _start:</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> </div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> #ifdef _ARM_ARCH_6</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  mrc p15, 0, ip, c1, c0, 0</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  orr ip, ip, #(CPU_CONTROL_UNAL_ENABLE)</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  orr ip, ip, #(CPU_CONTROL_AFLT_ENABLE)</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  mcr p15, 0, ip, c1, c0, 0</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> #endif</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  /* </div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  * Do self-relocation when the weak external symbol _DYNAMIC is non-NULL.</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  * When linked as a dynamic relocatable file, the linker automatically</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  * defines _DYNAMIC with a value that is the offset of the dynamic</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  * relocation info section.</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  * Note that we're still on u-boot's stack here, but the self_reloc </div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  * code uses only a couple dozen bytes of stack space.</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  */</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  adr ip, .here_off /* .here_off is a symbol whose value */</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  ldr r0, [ip] /* is its own offset in the text seg. */</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  sub r0, ip, r0 /* Get its pc-relative address and */</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  ldr r1, .dynamic_off /* subtract its value and we get */</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  teq r1, #0 /* r0 = physaddr we were loaded at. */</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  addne r1, r1, r0 /* r1 = dynamic section physaddr. */</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  blne _C_LABEL(self_reloc) /* Do reloc if _DYNAMIC is non-NULL. */</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> </div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  /* Hint where to look for the API signature */</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  ldr ip, =uboot_address</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  str sp, [ip]</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> </div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  /* Save U-Boot's r8 and r9 */</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  ldr ip, =saved_regs</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  str r8, [ip, #0]</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  str r9, [ip, #4]</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> </div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  /* </div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  * Start loader. This is basically a tail-recursion call; if main()</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  * returns, it returns to u-boot (which reports the value returned r0).</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  */</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  b main</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span> </div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  /* </div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  * Data for self-relocation, in the text segment for pc-rel access.</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  */</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> .here_off:</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  .word .</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> .dynamic_off:</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  .word _DYNAMIC</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span> </div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span> /*</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  * syscall()</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  */</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> ENTRY(syscall)</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  /* Save caller's lr, r8 and r9 */</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  ldr ip, =saved_regs</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  str r8, [ip, #8]</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  str r9, [ip, #12]</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  str lr, [ip, #16]</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  /* Restore U-Boot's r8 and r9 */</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  ldr r8, [ip, #0]</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  ldr r9, [ip, #4]</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  /* Call into U-Boot */</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  ldr lr, =return_from_syscall</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  ldr ip, =syscall_ptr</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  ldr pc, [ip]</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> return_from_syscall:</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  /* Restore loader's r8, r9 and lr */</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  ldr ip, =saved_regs</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  ldr lr, [ip, #16]</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  ldr r9, [ip, #12]</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  ldr r8, [ip, #8]</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  /* Return to caller */</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  mov pc, lr</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span> </div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span> /*</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  * Data section</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  */</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  .data</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  .align 4</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  .globl syscall_ptr</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> syscall_ptr:</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  .long 0</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span> </div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  .globl uboot_address</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span> uboot_address:</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  .long 0</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span> </div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span> saved_regs:</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  .long 0 /* U-Boot's r8 */</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  .long 0 /* U-Boot's r9 */</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  .long 0 /* Loader's r8 */</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  .long 0 /* Loader's r9 */</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  .long 0 /* Loader's lr */</div>
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