如何让asm跳转到c中的变量地址？

Question

Right now, I call the jump instruction with inline assembly in c as follows:现在，我在 c 中调用带有内联汇编的跳转指令，如下所示：

int register eax asm("eax") = addr; // addr is a memory address
asm("jmp *%eax");

I want to do it without having to set any other register values (eg I want to do is something like this):我想这样做而不必设置任何其他寄存器值（例如，我想做的是这样的）：

asm("jmp *(addr)");

What is the right way to do that?这样做的正确方法是什么？ That is, how can I "insert" ac variable into the asm call?也就是说，如何将 ac 变量“插入”到 asm 调用中？

Ubuntu 12.04 64-bit, Intel x86 64-bit processor, gcc version 4.7.4. Ubuntu 12.04 64 位，Intel x86 64 位处理器，gcc 版本 4.7.4。

Answer 1

asm volatile("jmp *%0" : : "r" (addr));