汇编语言中出现#include, #define的问题

2024-08-28 12:18

本文主要是介绍汇编语言中出现#include, #define的问题,希望对大家解决编程问题提供一定的参考价值,需要的开发者们随着小编来一起学习吧!

U_boot源文件中,一些 .S文件中出现了#include, #define,如board\smdk2410目录下的lowlevel_init.S文件:

#include <config.h>
#include <version.h>

/* some parameters for the board */

/*
 *
 * Taken from linux/arch/arm/boot/compressed/head-s3c2410.S
 *
 * Copyright (C) 2002 Samsung Electronics SW.LEE  <hitchcar@sec.samsung.com>
 *
 */

#define BWSCON 0x48000000

/* BWSCON */
#define DW8 (0x0)
#define DW16 (0x1)
#define DW32 (0x2)
#define WAIT (0x1<<2)
#define UBLB (0x1<<3)

#define B1_BWSCON   (DW32)
#define B2_BWSCON   (DW16)
#define B3_BWSCON   (DW16 + WAIT + UBLB)
#define B4_BWSCON   (DW16)
#define B5_BWSCON   (DW16)
#define B6_BWSCON   (DW32)
#define B7_BWSCON   (DW32)


/* BANK0CON */
#define B0_Tacs 0x0 /*  0clk */
#define B0_Tcos 0x0 /*  0clk */
#define B0_Tacc 0x7 /* 14clk */
#define B0_Tcoh 0x0 /*  0clk */
#define B0_Tah 0x0 /*  0clk */
#define B0_Tacp 0x0
#define B0_PMC 0x0 /* normal */

/* BANK1CON */
#define B1_Tacs 0x0 /*  0clk */
#define B1_Tcos 0x0 /*  0clk */
#define B1_Tacc 0x7 /* 14clk */
#define B1_Tcoh 0x0 /*  0clk */
#define B1_Tah 0x0 /*  0clk */
#define B1_Tacp 0x0
#define B1_PMC 0x0

#define B2_Tacs 0x0
#define B2_Tcos 0x0
#define B2_Tacc 0x7
#define B2_Tcoh 0x0
#define B2_Tah 0x0
#define B2_Tacp 0x0
#define B2_PMC 0x0


#define B3_Tacs 0x0 /*  0clk */
#define B3_Tcos 0x3 /*  4clk */
#define B3_Tacc 0x7 /* 14clk */
#define B3_Tcoh 0x1 /*  1clk */
#define B3_Tah 0x0 /*  0clk */
#define B3_Tacp 0x3     /*  6clk */
#define B3_PMC 0x0 /* normal */

#define B4_Tacs 0x0 /*  0clk */
#define B4_Tcos 0x0 /*  0clk */
#define B4_Tacc 0x7 /* 14clk */
#define B4_Tcoh 0x0 /*  0clk */
#define B4_Tah 0x0 /*  0clk */
#define B4_Tacp 0x0
#define B4_PMC 0x0 /* normal */
#define B5_Tacs 0x0 /*  0clk */
#define B5_Tcos 0x0 /*  0clk */
#define B5_Tacc 0x7 /* 14clk */
#define B5_Tcoh 0x0 /*  0clk */
#define B5_Tah 0x0 /*  0clk */
#define B5_Tacp 0x0
#define B5_PMC 0x0 /* normal */


#define B6_MT 0x3 /* SDRAM */
#define B6_Trcd 0x1
#define B6_SCAN 0x1 /* 9bit */


#define B7_MT 0x3 /* SDRAM */
#define B7_Trcd 0x1 /* 3clk */
#define B7_SCAN 0x1 /* 9bit */


/* REFRESH parameter */
#define REFEN 0x1 /* Refresh enable */
#define TREFMD 0x0 /* CBR(CAS before RAS)/Auto refresh */
#define Trp 0x0 /* 2clk */
#define Trc 0x3 /* 7clk */
#define Tchr 0x2 /* 3clk */
#define REFCNT 1113 /* period=15.6us, HCLK=60Mhz, (2048+1-15.6*60) */
/**************************************/

_TEXT_BASE:
.word TEXT_BASE


.globl lowlevel_init
lowlevel_init:
/* memory control configuration */
/* make r0 relative the current location so that it */
/* reads SMRDATA out of FLASH rather than memory ! */
ldr     r0, =SMRDATA
ldr r1, _TEXT_BASE
sub r0, r0, r1
ldr r1, =BWSCON /* Bus Width Status Controller */
add     r2, r0, #13*4
0:
ldr     r3, [r0], #4
str     r3, [r1], #4
cmp     r2, r0
bne     0b


/* everything is fine now */
mov pc, lr


.ltorg
/* the literal pools origin */


SMRDATA:
    .word (0+(B1_BWSCON<<4)+(B2_BWSCON<<8)+(B3_BWSCON<<12)+(B4_BWSCON<<16)+(B5_BWSCON<<20)+(B6_BWSCON<<24)+(B7_BWSCON<<28))
    .word ((B0_Tacs<<13)+(B0_Tcos<<11)+(B0_Tacc<<8)+(B0_Tcoh<<6)+(B0_Tah<<4)+(B0_Tacp<<2)+(B0_PMC))
    .word ((B1_Tacs<<13)+(B1_Tcos<<11)+(B1_Tacc<<8)+(B1_Tcoh<<6)+(B1_Tah<<4)+(B1_Tacp<<2)+(B1_PMC))
    .word ((B2_Tacs<<13)+(B2_Tcos<<11)+(B2_Tacc<<8)+(B2_Tcoh<<6)+(B2_Tah<<4)+(B2_Tacp<<2)+(B2_PMC))
    .word ((B3_Tacs<<13)+(B3_Tcos<<11)+(B3_Tacc<<8)+(B3_Tcoh<<6)+(B3_Tah<<4)+(B3_Tacp<<2)+(B3_PMC))
    .word ((B4_Tacs<<13)+(B4_Tcos<<11)+(B4_Tacc<<8)+(B4_Tcoh<<6)+(B4_Tah<<4)+(B4_Tacp<<2)+(B4_PMC))
    .word ((B5_Tacs<<13)+(B5_Tcos<<11)+(B5_Tacc<<8)+(B5_Tcoh<<6)+(B5_Tah<<4)+(B5_Tacp<<2)+(B5_PMC))
    .word ((B6_MT<<15)+(B6_Trcd<<2)+(B6_SCAN))
    .word ((B7_MT<<15)+(B7_Trcd<<2)+(B7_SCAN))
    .word ((REFEN<<23)+(TREFMD<<22)+(Trp<<20)+(Trc<<18)+(Tchr<<16)+REFCNT)
    .word 0x32
    .word 0x30
    .word 0x30


在网上查找了一些资料,现将http://gcc.gnu.org/ml/gcc-help/2003-09/msg00111.html网站上的解释粘贴如下:

On Wed, Sep 10, 2003 at 01:07:25PM -0700, garret.spears wrote:


> Refernce:
> gcc-2.95.3 -m5200 -x assembler led.S


Before you compile an assembly source file, you should decide whether
you want to pass it through the C preprocessor (CPP) or not. If you
decide to use the preprocessor then you should name your source-file
"something.S" (capital "S"); if not, then you should name it
"something.s" (lowcase "s"). Provided that you follow this convention
you don't *have* to specify the source-language explicitly using the
"-x <lang>" option; gcc can figure-it out from the filename
extension. If you don't want to or can't use this naming convention,
then "-x <lang>" is required:


   gcc-2.95.3 -m5200 asmcode.s -o asmcode.o
   gcc-2.95.3 -m5200 -x assembler asmcode.asm -o asmcode.o
   
   
     Compile without passing the source through CPP.


   gcc-2.95.3 -m5200 asmcode1.S -o asmcode1.o
   gcc-2.95.3 -m5200 -x assembler-with-cpp asmcode1.asm -o asmcode1.o


     Pass the source through CPP and then compile.


If you decide to pass your assembly through CPP, then (and only then)
you *can* use all the C preprocessor goodies, like "#define",
"#include", "#ifdef", etc. But remember: these are handled by the
preprocessor *not* the assmebler!



> #DEFINE INIT_SECTION_ASM_OP  // is this a requird line or should ther be
> another?
>


This is neither required nor allowed! First: you're not using
"assembler-with-cpp" so #DEFINE has no sense! Second: Even if you used
it, CPP is CaSe-SeNsItIvE, so it should be "#define" and not "#DEFINE"
 
> // Base addr of internal resources & SIM resources
> MBAR    EQU    0x10000000                // alt I have seen ".set


What you should have said is (observe the dot!):


  MBAR    .EQU    0x10000000 


Which is the same as saying


  #define MBAR 0x10000000



> Should I be using a dot h file for some of this and a dot s file for my
> actual assembly coding?
>


You can use ".h" files (and the respective "#include" directives) only
if you pass your assembly through CPP. You don't *have* to use them,
though!


> Essentially when I did this years
> ago I dedicated a section to defines or equates, a section to data space,
> and a section to code - assembly language.


data section:


 .data


     ... contents of the data-section ...


code section:


 .text


     ... contents of the text-section ...


or if you use an object-format that can support arbitrarily-named
sections:


  .section ".data"


     ... contents of the data-section ...


  .section ".text"


     ... contents of the text-section ...


You don't need a section for the "equ"s since they produce no output!


Hope this helps
/npat


-- 
As for systems that are not like Unix, such as MSDOS, Windows, the
Macintosh, VMS, and MVS, supporting them is usually so much work that
it is better if you don't.
  -- Richard Stallman "GNU Coding Standards"

这篇关于汇编语言中出现#include, #define的问题的文章就介绍到这儿,希望我们推荐的文章对编程师们有所帮助!



http://www.chinasem.cn/article/1114740

相关文章

springboot循环依赖问题案例代码及解决办法

《springboot循环依赖问题案例代码及解决办法》在SpringBoot中,如果两个或多个Bean之间存在循环依赖(即BeanA依赖BeanB,而BeanB又依赖BeanA),会导致Spring的... 目录1. 什么是循环依赖?2. 循环依赖的场景案例3. 解决循环依赖的常见方法方法 1:使用 @La

SpringBoot启动报错的11个高频问题排查与解决终极指南

《SpringBoot启动报错的11个高频问题排查与解决终极指南》这篇文章主要为大家详细介绍了SpringBoot启动报错的11个高频问题的排查与解决,文中的示例代码讲解详细,感兴趣的小伙伴可以了解一... 目录1. 依赖冲突:NoSuchMethodError 的终极解法2. Bean注入失败:No qu

MySQL新增字段后Java实体未更新的潜在问题与解决方案

《MySQL新增字段后Java实体未更新的潜在问题与解决方案》在Java+MySQL的开发中,我们通常使用ORM框架来映射数据库表与Java对象,但有时候,数据库表结构变更(如新增字段)后,开发人员可... 目录引言1. 问题背景:数据库与 Java 实体不同步1.1 常见场景1.2 示例代码2. 不同操作

如何解决mysql出现Incorrect string value for column ‘表项‘ at row 1错误问题

《如何解决mysql出现Incorrectstringvalueforcolumn‘表项‘atrow1错误问题》:本文主要介绍如何解决mysql出现Incorrectstringv... 目录mysql出现Incorrect string value for column ‘表项‘ at row 1错误报错

如何解决Spring MVC中响应乱码问题

《如何解决SpringMVC中响应乱码问题》:本文主要介绍如何解决SpringMVC中响应乱码问题,具有很好的参考价值,希望对大家有所帮助,如有错误或未考虑完全的地方,望不吝赐教... 目录Spring MVC最新响应中乱码解决方式以前的解决办法这是比较通用的一种方法总结Spring MVC最新响应中乱码解

pip无法安装osgeo失败的问题解决

《pip无法安装osgeo失败的问题解决》本文主要介绍了pip无法安装osgeo失败的问题解决,文中通过示例代码介绍的非常详细,对大家的学习或者工作具有一定的参考学习价值,需要的朋友们下面随着小编来一... 进入官方提供的扩展包下载网站寻找版本适配的whl文件注意:要选择cp(python版本)和你py

解决Java中基于GeoTools的Shapefile读取乱码的问题

《解决Java中基于GeoTools的Shapefile读取乱码的问题》本文主要讨论了在使用Java编程语言进行地理信息数据解析时遇到的Shapefile属性信息乱码问题,以及根据不同的编码设置进行属... 目录前言1、Shapefile属性字段编码的情况:一、Shp文件常见的字符集编码1、System编码

Spring MVC使用视图解析的问题解读

《SpringMVC使用视图解析的问题解读》:本文主要介绍SpringMVC使用视图解析的问题解读,具有很好的参考价值,希望对大家有所帮助,如有错误或未考虑完全的地方,望不吝赐教... 目录Spring MVC使用视图解析1. 会使用视图解析的情况2. 不会使用视图解析的情况总结Spring MVC使用视图

Redis解决缓存击穿问题的两种方法

《Redis解决缓存击穿问题的两种方法》缓存击穿问题也叫热点Key问题,就是⼀个被高并发访问并且缓存重建业务较复杂的key突然失效了,无数的请求访问会在瞬间给数据库带来巨大的冲击,本文给大家介绍了Re... 目录引言解决办法互斥锁(强一致,性能差)逻辑过期(高可用,性能优)设计逻辑过期时间引言缓存击穿:给

Java程序运行时出现乱码问题的排查与解决方法

《Java程序运行时出现乱码问题的排查与解决方法》本文主要介绍了Java程序运行时出现乱码问题的排查与解决方法,包括检查Java源文件编码、检查编译时的编码设置、检查运行时的编码设置、检查命令提示符的... 目录一、检查 Java 源文件编码二、检查编译时的编码设置三、检查运行时的编码设置四、检查命令提示符