ARM 指令关于DCD和SPACE的一个问题

Golden_Chen 2009-04-16 01:18:21

语句如下：
FiqStackSpace SPACE FIQ_Stack_Legth
FiqStack DCD FiqStackSpace + FIQ_Stack_Legth

最后一条语句，DCD的后面跟FiqStackSpace + FIQ_Stack_Legth，
DCD后面的FiqStackSpace，表示一串空字符，这好理解
但是再上FIQ_Stack_Legth，就不明白了，WHY？

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gzp20 2009-11-17

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很有用啊

OneOnce 2009-11-13

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FiqStackSpace SPACE FIQ_Stack_Legth
FiqStack DCD FiqStackSpace + FIQ_Stack_Legth

分配一直空间，起始地址是：FIQ_Stack_Legth ，空间大小FiqStackSpace + FIQ_Stack_Legth(其实地址加偏移量或者说长度)。

就跟C中申请内存一样：
PBYTE p;
p = (PBYTE)malloc(100);

lzycome 2009-11-12

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ldr r0,=XX 此时的 XX 是地址（伪指令）
ldr r0,XX 此时的 XX 是值

Golden_Chen 2009-04-20

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{Label} DCD expr 表示分配一段字内存，并用expr初始化
上楼说FiqStackSpace+ FIQ_Stack_Legth 是一个地址值，那编译时如何区分地址值和初始化值的？
这一点比较迷糊。

liaifeilove 2009-04-16

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FiqStackSpace是标号，相当与地址，实际上就是在FiqStackSpace SPACE FIQ_Stack_Legth 这个语句给分配的空间的首地址，FiqStackSpace+ FIQ_Stack_Legth 是这个地址空间的结束地址，将FiqStack指向这个地址，当做栈的顶部，该栈向下生长，长度FIQ_Stack_Legth

前言...............................................................................................................................................................i 目录...............................................................................................................................................................I ARM7TDMI(-S)指令集及汇编....................................................................................................................1 ARM 处理器寻址方式..........................................................................................................................2 寄存器寻址...................................................................................................................................2 立即寻址.......................................................................................................................................2 寄存器偏移寻址............................................................................................................................2 寄存器间接寻址............................................................................................................................3 基址寻址.......................................................................................................................................3 多寄存器寻址...............................................................................................................................4 堆栈寻址.......................................................................................................................................4 块拷贝寻址...................................................................................................................................5 相对寻址.......................................................................................................................................5 指令集介绍...........................................................................................................................................7 ARM 指令集.................................................................................................................................7 指令格式...............................................................................................................................7 第2 个操作数................................................................................................................7 ＃immed_8r ...........................................................................................................7 Rm..........................................................................................................................8 Rm,shift..................................................................................................................8 条件码............................................................................................................................9 ARM 存储器访问指令........................................................................................................ 11 　 LDR 和STR ........................................................................................................ 11 　 LDM 和STM.......................................................................................................14 　 SWP .....................................................................................................................17 ARM 数据处理指令............................................................................................................19 数据传送指令..............................................................................................................20 　 MOV ............................................................................................................20 　 MVN ............................................................................................................20 算术逻辑运算指令......................................................................................................20 　 ADD.............................................................................................................20 　 SUB..............................................................................................................21 　 RSB..............................................................................................................21 　 ADC .............................................................................................................21 　 SBC..............................................................................................................21 　 RSC..............................................................................................................22 　 AND.............................................................................................................22 　 ORR..............................................................................................................22 　 EOR..............................................................................................................22 比较指令......................................................................................................................23 　 CMP.............................................................................................................23 　 CMN.............................................................................................................23 　 TST...............................................................................................................24 　 TEQ..............................................................................................................24 乘法指令......................................................................................................................25 　 MUL.............................................................................................................25 　 MLA.............................................................................................................25 　 UMULL........................................................................................................25 　 UMLAL........................................................................................................26 　 SMULL........................................................................................................26 　 SMLAL........................................................................................................26 ARM 跳转指令....................................................................................................................27 　 B...........................................................................................................................27 　 BL.........................................................................................................................27 　 BX........................................................................................................................27 ARM 协处理器指令............................................................................................................28 　 CDP......................................................................................................................28 　 LDC......................................................................................................................29 　 STC ......................................................................................................................29 　 MCR.....................................................................................................................30 　 MRC.....................................................................................................................30 ARM 杂项指令....................................................................................................................31 　 SWI ......................................................................................................................31 　 MRS.....................................................................................................................32 　 MSR.....................................................................................................................33 ARM 伪指令........................................................................................................................34 　 ADR.....................................................................................................................35 　 ADRL...................................................................................................................35 　 LDR......................................................................................................................36 　 NOP......................................................................................................................37 Thumb 指令集.............................................................................................................................39 Thumb 指令集与ARM 指令集的区别..............................................................................39 Thumb 存储器访问指令.....................................................................................................40 　 LDR 和STR ........................................................................................................41 　 PUSH 和POP ......................................................................................................43 　 LDMIA 和STMIA ..............................................................................................43 Thumb 数据处理指令.........................................................................................................45 数据传送指令..............................................................................................................46 　 MOV ............................................................................................................46 　 MVN ............................................................................................................46 　 NEG..............................................................................................................47 算术逻辑运算指令......................................................................................................47 　 ADD.............................................................................................................47 　 SUB..............................................................................................................48 　 ADC .............................................................................................................49 　 SBC..............................................................................................................49 　 MUL.............................................................................................................50 　 AND.............................................................................................................50 　 ORR..............................................................................................................50 　 EOR..............................................................................................................51 　 BIC...............................................................................................................51 　 ASR..............................................................................................................51 　 LSL...............................................................................................................52 　 LSR ..............................................................................................................52 　 ROR..............................................................................................................53 比较指令......................................................................................................................53 　 CMP.............................................................................................................53 　 CMN.............................................................................................................54 　 TST...............................................................................................................54 Thumb 跳转指令.........................................................................................................55 　 B...................................................................................................................55 　 BL.................................................................................................................55 　 BX................................................................................................................55 Thumb 杂项指令.........................................................................................................56 　 SWI ..............................................................................................................56 Thumb 伪指令.............................................................................................................57 　 ADR .............................................................................................................57 　 LDR..............................................................................................................57 　 NOP..............................................................................................................58 伪指令.................................................................................................................................................59 符号定义伪指令..........................................................................................................................59 　 GBLA、GBLL、GBLS ..............................................................................................59 　 LCLA、LCLL、LCLS................................................................................................60 　 SETA、SETL、SETS .................................................................................................61 　 RLIST..........................................................................................................................61 　 CN...............................................................................................................................62 　 CP................................................................................................................................62 　 DN、SN.......................................................................................................................62 　 FN................................................................................................................................63 数据定义伪指令..........................................................................................................................63 　 LTORG.........................................................................................................................64 　 MAP............................................................................................................................64 　 FIELD ..........................................................................................................................65 　 SPACE..........................................................................................................................66 　 DCB .............................................................................................................................66 　 DCD 和DCDU............................................................................................................67 　 DCDO ..........................................................................................................................67 DCFD 和DCFDU........................................................................................................68 　 DCFS 和DCFSU.........................................................................................................68 　 DCI..............................................................................................................................69 　 DCQ 和DCQU............................................................................................................69 　 DCW 和DCWU..........................................................................................................70 报告伪指令.................................................................................................................................70 　 ASSERT.......................................................................................................................70 　 INFO ............................................................................................................................71 　 OPT.............................................................................................................................71 　 TTL 和SUBT ..............................................................................................................72 汇编控制伪指令..........................................................................................................................73 　 IF、ELSE 和ENDIF...................................................................................................73 　 MACRO 和MEND .....................................................................................................74 　 WHIL 和WEND .........................................................................................................75 杂项伪指令.................................................................................................................................76 　 ALIGN .........................................................................................................................77 　 AREA...........................................................................................................................78 　 CODE16 和CODE32..................................................................................................79 　 END .............................................................................................................................80 　 ENTRY.........................................................................................................................80 　 EQU .............................................................................................................................81 　 EXPORT 和GLOBAL ................................................................................................81 　 IMPORT 和EXTERN.................................................................................................82 　 GET 和INCLUDE ......................................................................................................83 　 INCBIN........................................................................................................................83 　 KEEP...........................................................................................................................83 　 NOFP ...........................................................................................................................84 　 REQUIRE ....................................................................................................................84 　 PEQUIRE8 和PRESERVE8 .......................................................................................84 　 RN...............................................................................................................................84 　 ROUT...........................................................................................................................85 ARM 伪指令...............................................................................................................................86 　 ADR............................................................................................................................86 　 ADRL...........................................................................................................................86 　 LDR.............................................................................................................................86 　 NOP.............................................................................................................................86 　 LDFD...........................................................................................................................86 　 LDFS...........................................................................................................................87 Thumb 伪指令.............................................................................................................................87 　 ADR............................................................................................................................87 　 LDR.............................................................................................................................87 　 NOP.............................................................................................................................88 ARM 汇编程序设计............................................................................................................................88 文件格式.....................................................................................................................................88 ARM 汇编的一些规范................................................................................................................88 汇编语句格式......................................................................................................................88 标号.....................................................................................................................................89 　基于PC 的标号...................................................................................................89 　基于寄存器的标号..............................................................................................90 　绝对地址..............................................................................................................90 局部标号..............................................................................................................................90 符号.....................................................................................................................................91 常量.....................................................................................................................................91 　数字常数..............................................................................................................91 　字符常量..............................................................................................................92 　布尔常量..............................................................................................................92 段定义.................................................................................................................................92 宏定义及其作用..................................................................................................................93 子程序的调用..............................................................................................................................94 数据比较跳转..............................................................................................................................95 循环.............................................................................................................................................95 数据块复制.................................................................................................................................95 栈操作.........................................................................................................................................96 特殊寄存器定义及应用..............................................................................................................96 散转功能.....................................................................................................................................97 查表操作.....................................................................................................................................97 长跳转.........................................................................................................................................97 对信号量的支持..........................................................................................................................98 伪指令使用.................................................................................................................................98 一个完整的例子..........................................................................................................................98 外围部件控制..............................................................................................................................99 三级流水线介绍..........................................................................................................................99 C 与汇编混合编程............................................................................................................................100 内嵌汇编...................................................................................................................................100 内嵌汇编的指令用法........................................................................................................103 内嵌汇编器与armasm 汇编器的差异.............................................................................104 内嵌汇编注意事项............................................................................................................104 访问全局变量............................................................................................................................106 C 与汇编相互调用....................................................................................................................107 寄存器的使用规则............................................................................................................108 堆栈使用规则....................................................................................................................108 参数传递规则....................................................................................................................109 C 程序调用汇编程序........................................................................................................ 110 汇编程序调用C 程序....................................................................................................... 111 ARM 指令集列表.............................................................................................................................. 113 ARM 存储器访问指令表列表.................................................................................................. 113 ARM 数据处理指令列表.......................................................................................................... 114 ARM 乘法指令列表.................................................................................................................. 115 ARM 跳转指令列表.................................................................................................................. 116 ARM 协处理器指令列表.......................................................................................................... 117 ARM 杂项指令列表.................................................................................................................. 118 ARM 伪指令列表...................................................................................................................... 119 Thumb 指令集列表...........................................................................................................................120 Thumb 存储器访问指令列表...................................................................................................120 Thumb 数据处理指令列表.......................................................................................................121 Thumb 跳转指令及软中断指令列表.......................................................................................122 Thumb 伪指令列表...................................................................................................................123 汇编预定义变量及伪指令................................................................................................................124 预定义的寄存器和协处理器名................................................................................................124 通用寄存器........................................................................................................................124 程序状态寄存器................................................................................................................124 浮点数寄存器....................................................................................................................124 协处理器及协处理器寄存器............................................................................................125 内置变量列表............................................................................................................................125 伪指令列表...............................................................................................................................126 指令条件码列表........................................................................................................................128 CPSR 和SPSR 分配图.............................................................................................................................129

本文主要讲解了arm指令有特殊意义的符号，希望对你的学习有所帮助。

这是自己整理的ARM的常用伪指令，可以方便ARM爱好者交流，有什么问题请指教

arm 常用伪指令适合初学者熟悉启动码很有帮助

详细描述了ARM的伪操作，可以当作参考手册来用

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