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_stat=0<br />
如果是重新relocate代码之后,就是我们定义的值了,即,在<br />
u-boot-1.1.6_20100601\opt\EmbedSky\u-boot-1.1.6\board\EmbedSky\config.mk<br />
中的:<br />
TEXT_BASE = 0x33D00000<br />
表示是代码段的基地址,即<br />
_start=TEXT_BASE=0x33D00000<br />
关于标号的语法解释:<br />
http://sourceware.org/binutils/docs-2.20/as/Labels.html#Labels<br />
―A label is written as a symbol immediately followed by a colon `:'. The<br />
symbol then represents the current value of the active location counter,<br />
and is, for example, a suitable instruction operand. You are warned if<br />
you use the same symbol to represent two different locations: the first<br />
definition overrides any other definitions. ‖<br />
而_start标号后面的:<br />
b reset<br />
就是跳转到对应的标号为reset的位置。<br />
ldr pc, _undefined_instruction<br />
ldr pc, _software_interrupt<br />
ldr pc, _prefetch_abort<br />
ldr pc, _data_abort<br />
ldr pc, _not_used<br />
ldr pc, _irq<br />
ldr pc, _fiq<br />
ldr命令的语法为:<br />
http://infocenter.arm.com/help/topic/com.arm.doc.dui0206hc/DUI0206HC_<br />
rvct_linker_and_utilities_guide.pdf
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