什么是相当于gcc中的Keil _at_

Question

Does gcc have any keyword exactly equivalent to _at_ in Keil ?

struct Location
{
  uint_32 x;
  uint_32 y;
  uint_32 z;
  char protocol[10];
};

struct link idata list _at_ 0x40;     /* list at idata 0x40 */

Note: I do not want to define a pointer at all. I want an exactly the same variable.

Note: the idata here can be ignored.

Answer 1

No, it doesn't. This Keil support page on the topic also suggests there is no direct equivalent of CARM's __at__ and armcc's __attribute__(at) in gcc:

GNU GCC Compiler
Use only pointer definitions to access absolute memory locations. For example:

/* General Purpose Input/Output (GPIO) */
#define IOPIN0         (*((volatile unsigned long *) 0xE0028000))
.
.
.
IOPIN0 = 0x4;

As an alternative to that, you can also define your own sections using an ld script.