汇编语言程序设计的笔记(1)

按有用程度 按页码先后 最新笔记

• 

  第4章 汇编语言程序范例

  Sherlock (希斯克利夫又何必硬装作是林顿)

  #cpuid.s to extract the processor Vendor ID #as -o cpuid.o cpuid.s #ld -o cpuid cpuid.o #./cpuid .section .data output: .ascii "The processor Vendor ID is 'XXXXXXXXXXXX' \n" .section .text .global _start _start: #call CPUID movl $0, %eax cpuid #ID is in ebx,ecx and edx movl $output, %edi movl %ebx, 28(%edi) movl %ecx, 32(%edi) movl %edx, 36(%edi) #syscall 4 is write... (更多)

  #cpuid.s to extract the processor Vendor ID

  #as -o cpuid.o cpuid.s

  #ld -o cpuid cpuid.o

  #./cpuid

  .section .data

  output:

  .ascii "The processor Vendor ID is 'XXXXXXXXXXXX' \n"

  .section .text

  .global _start

  _start:

  #call CPUID

  movl $0, %eax

  cpuid

  #ID is in ebx,ecx and edx

  movl $output, %edi

  movl %ebx, 28(%edi)

  movl %ecx, 32(%edi)

  movl %edx, 36(%edi)

  #syscall 4 is write

  movl $4, %eax

  # write parameter1:File descriptor, 0 stdin , 1 stdout , 2 err

  movl $1, %ebx

  # write parameter2: start of data to write

  movl $output, %ecx

  #write parameter3:length of data to write

  movl $42, %edx

  #call write

  int $0x80

  #syscall 1 is exit

  movl $1,%eax

  movl $0,%ebx

  int $0x80

  注：

  这是用GNU编译器编译，GNU连接器连接的。GNU连接器查找_start标签以便确定程序的开始位置。

  如果要用GCC汇编程序的话，查找的是main标签，所以要把_start改为main。汇编连接

  gcc -o cpuid cpuid.s (收起)

  2011-12-13 16:11:19   回应

  收藏

  推荐