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opps! make a spell mistake
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debug/hello/README.md

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@@ -57,7 +57,7 @@ arm-eabi-objdump your_module.ko -D > output.dis
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r4 为变量t
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push {r4, lr} 是压栈操作
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move r4, #0 对应 t = NULL
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ldr r1, [pc, #20] 这里答应__FUNCTION__
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ldr r1, [pc, #20] 这里打印__FUNCTION__
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mov r2, #13 是对应行号
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ldrb r3, [r4] 这里将r4存入r3,但是这里r4是空指针,所以这里崩溃了
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