相关疑难解决方法(0)

我试图在64位Linux上的GCC扩展内联ASM中输出相同的字符串两次.

int main()
{
    const char* test = "test\n";

    asm(
        "movq %[test], %%rdi\n"    // Debugger shows rdi = *address of string*  
        "movq $0, %%rax\n"

        "push %%rbp\n"
        "push %%rbx\n"
        "call printf\n"         
        "pop %%rbx\n"
        "pop %%rbp\n"

        "movq %[test], %%rdi\n" // Debugger shows rdi = 0
        "movq $0, %%rax\n"

        "push %%rbp\n"
        "push %%rbx\n"
        "call printf\n"     
        "pop %%rbx\n"
        "pop %%rbp\n"
        : 
        :  [test] "g" (test)
        : "rax", "rbx","rcx", "rdx", "rdi", "rsi", "rsp"
        );

    return 0;
}

现在,字符串只输出一次.我尝试了很多东西,但我想我错过了关于调用约定的一些注意事项.我甚至不确定clobber列表是否正确,或者我是否需要保存和恢复RBP和RBX.

为什么字符串不输出两次？ …