ARM 学习笔记之17：Uppercase or lowercase when writing assembly language source code

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博客介绍了ARM指令编写规范，指令助记符、伪指令、指令和符号寄存器名（除A32或T32指令中的a1 - a4和v1 - v8）需全大写或全小写，标签和注释大小写不限。还提及许多核心寄存器有同义词，除特定寄存器外，寄存器名可全大写或全小写。

You must write instruction mnemonics, pseudo-instructions, directives, and symbolic register names
(except a1-a4 and v1-v8 in A32 or T32 instructions) in either all uppercase or all lowercase. You must
not use mixed case. Labels and comments can be in uppercase, lowercase, or mixed case.
AREA A32ex, CODE, READONLY
; Name this block of code A32ex
ENTRY ; Mark first instruction to execute
start
MOV r0, #10 ; Set up parameters
MOV r1, #3
ADD r0, r0, r1 ; r0 = r0 + r1
stop
MOV r0, #0x18 ; angel_SWIreason_ReportException
LDR r1, =0x20026 ; ADP_Stopped_ApplicationExit
SVC #0x123456 ; AArch32 semihosting (formerly SWI)
END ; Mark end of file

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Many of the core register names have synonyms. The following table shows the predeclared core registers:

Register names	Meaning
r0-r15 and R0-R15	General purpose registers.
a1-a4	Argument, result or scratch registers. These are synonyms for R0 to R3.
v1-v8	Variable registers. These are synonyms for R4 to R11.
SB	Static base register. This is a synonym for R9.
IP	Intra-procedure call scratch register. This is a synonym for R12.
SP	Stack pointer. This is a synonym for R13.
LR	Link register. This is a synonym for R14.
PC	Program counter. This is a synonym for R15.