asm-offsets.c

linux内核源码

#include <linux/sched.h>
#include <asm/thread_info.h>

/*
 * Generate definitions needed by assembly language modules.
 * This code generates raw asm output which is post-processed to extract
 * and format the required data.
 */

#define DEFINE(sym, val) \
        asm volatile("\n->" #sym " %0 " #val : : "i" (val))

#define BLANK() asm volatile("\n->" : : )

int main(void)
{
#define ENTRY(entry) DEFINE(PT_ ## entry, offsetof(struct pt_regs, entry))
	ENTRY(orig_r10);
	ENTRY(r13);
	ENTRY(r12);
	ENTRY(r11);
        ENTRY(r10);
        ENTRY(r9);
	ENTRY(acr);
	ENTRY(srs);
        ENTRY(mof);
        ENTRY(ccs);
        ENTRY(srp);
	BLANK();
#undef ENTRY
#define ENTRY(entry) DEFINE(TI_ ## entry, offsetof(struct thread_info, entry))
        ENTRY(task);
        ENTRY(flags);
        ENTRY(preempt_count);
        BLANK();
#undef ENTRY
#define ENTRY(entry) DEFINE(THREAD_ ## entry, offsetof(struct thread_struct, entry))
	ENTRY(ksp);
        ENTRY(usp);
        ENTRY(ccs);
        BLANK();
#undef ENTRY
#define ENTRY(entry) DEFINE(TASK_ ## entry, offsetof(struct task_struct, entry))
        ENTRY(pid);
        BLANK();
        DEFINE(LCLONE_VM, CLONE_VM);
        DEFINE(LCLONE_UNTRACED, CLONE_UNTRACED);
        return 0;
}