ARM 汇编中的语法
我做了更多阅读，发现了这个链接< /a>.在这里，实现互斥体的大多数步骤都非常直接且易于理解...但是有一些我不明白的事情在这个代码片段中：
BEQ %b1 ; Failed - retry from 1
; Lock acquired
DMB ; Required before accessing protected resource
BX lr 2 ; Take appropriate action while waiting for mutex to become unlocked
WAIT_FOR_UPDATE
B %b1 ; Retry from 1
存在于 lock_mutex 过程中。 %b1 和 %f2 是什么？它们有什么关系？
谢谢， 维杰
I have been doing some more reading and came upon this link. Over here most of the steps to implement a Mutex are quite direct and understandable... but a few things that I don't understand are in this snippet :
BEQ %b1 ; Failed - retry from 1
; Lock acquired
DMB ; Required before accessing protected resource
BX lr 2 ; Take appropriate action while waiting for mutex to become unlocked
WAIT_FOR_UPDATE
B %b1 ; Retry from 1
present within the lock_mutex procedure. What is %b1 and %f2 ?? What do they relate to ?
Thanks,
Vijay
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%b/f用于引用指令周围的临时标签。%b表示“后退”，%f表示“前进”。该数字是要使用的标签。例如，代码中的2在前三行中将被称为%f2，在后两行中将被称为%b2。%b/fare used to refer to temporary labels around the instruction.%bindicates "back" and%findicates "forward". The number is the label to use. For example, the2you have in code would be referred to as%f2on the first three lines, and%b2on the last two.我不熟悉那里使用的汇编语法，但如果我不得不猜测，我会说
%b1指的是向后跳转到标签 1，并且%f2指向前跳转到标签 2。I'm not familiar with the assembler syntax used there, but if I had to guess, I'd say that
%b1refers to a backward jump to label 1, and%f2refers to a forward jump to label 2.