但是,由于asm是GNU C的一个关键字,在GNU C下变量asm是不合法的,会提示下面的错误:$ gcc -Wall ansi.c -o ansi ansi.c: In function‘main’: ansi.c:5:16: error: expected identifier or ‘(’ before ‘asm’ const char asm[] = "6502"; ^ ansi.c:6:45: error: expected expression before...
ARM汇编语言源程序语句:一般由指令,伪操作,宏指令和伪指令组成. ARM汇编语言的设计基础是汇编伪指令,汇编伪操作和宏指令. 目前常用的ARM编译环境有2种: ARMASM: ARM公司的IDE中使用了CodeWarrior的编译器,绝大多数windows下的开发者都在使用这一环境,完全按照ARM
.ifeq expression @判断expression的值是否为0 .ifeqs string1,string2 @判断string1和string2是否相等,字符 串必须用双引号括起来 .ifge expression @判断expression的值是否大于等于0 .ifgt absolute expression @判断expression的值是否大于0 .ifle expression @判断expression的值是否小于等于0 .iflt absolute expr...
.ifle expression @判断expression的值是否小于等于0 .iflt absolute expression @判断expression的值是否小于0 .ifnc string1,string2 @判断string1和string2是否不相等, 其用法跟.ifc恰好相反。 .ifndef symbol, .ifnotdef symbol @判断是否没有定义symbol, 跟.ifdef恰好相反 .ifne expression @如果expression的值...
在当前输出section内可能存在未描述的存储区域(比如由于对齐造成的空隙),可以用 FILL ( EXPRESSION )命令决定这些存储区域的内容, EXPRESSION的前两字节有效,这两字节在必要时可以重复被使用以填充这类存储区域。如FILE(0×9090)。在输出section描述中可以有 =FILEEXP 属性,它的作用如同FILE()命令,但是FILE命令只作用...
(与arm asm中的AREA相同)。下面是ELF格式允许的段标志flags: <标志> 含义 a 允许段 w 可写段 x 执行段例:定义一个“段” .section.mysection @自定义数据段,段名为“.mysection” .align 2 strtemp: .ascii "Temp string \n\0" @对这一句的理解,我觉得应该是:将"Temp string \n\0"这个字符串...
For example, -std=c90 turns off certain features of GCC that are incompatible with ISO C90, such as the "asm" and "typeof" keywords, but not other GNU extensions that do not have a meaning in ISO C90, such as omitting the middle term of a "?:" expression. On the other hand, ...
For example, -std=c90 turns off certain features of GCC that are incompatible with ISO C90, such as the "asm" and "typeof" keywords, but not other GNU extensions that do not have a meaning in ISO C90, such as omitting the middle term of a "?:" expression. On the other hand, ...
// Lint to pass gracefully over expression-statements like: // __asm __volatile ("fsqrt" : "=t" (__result) : "0" (__x)); // But it may be necessary to suppress certain error messages that are // triggered by tokens that are part of an assembly...
GNUARM汇编指令（注意是GNU,区别与armasm）