如何从堆栈向stdout写入字符串(如“hello”)。没有数据段,也就是说。
void main() {
__asm__(
"movl $0x4, %eax \n\t"
"movl $0x1, %ebx \n\t"
// put "Hello" on the stack and load its address into %ecx
"movl $0x5, %edx \n\t"
"int $0x80 \n\t"
"movl $0x1, %eax \n\t"
"movl $0x0, %ebx \n\t"
"int $0x80 \n\t"
);
}
提前谢谢
最佳答案
答案1:
int main()
{
const char* string = "hello"; // string is not in a data segment, it's in the text segment
fputs(string, stdout);
return 0;
}
答案2:
int main()
{
char[6] string = "hello"; // Space for string allocated on stack
fputs(string, stdout);
return 0;
}
对于gcc,第二个答案似乎产生了以下结果:
main:
leal 4(%esp), %ecx
andl $-16, %esp
pushl -4(%ecx)
pushl %ebp
movl %esp, %ebp
pushl %ecx
subl $36, %esp
movl $1819043176, -10(%ebp) ;<< hell
movw $111, -6(%ebp) ;<< o\0
movl stdout, %eax
movl %eax, 4(%esp)
leal -10(%ebp), %eax
movl %eax, (%esp)
call fputs
movl $0, %eax
addl $36, %esp
popl %ecx
popl %ebp
leal -4(%ecx), %esp
很明显只使用堆栈。
关于c - Linux上的C内联汇编,将字符串从堆栈写入stdout,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/3263555/