asm-offsets.c

来自「底层驱动开发」· C语言 代码 · 共 44 行

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

#include <linux/types.h>
#include <linux/stddef.h>
#include <linux/sched.h>
#include <linux/ptrace.h>
#include <asm/io.h>

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

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

void foo(void)
{
	DEFINE(TI_TASK, offsetof(struct thread_info, task));
	DEFINE(TI_FLAGS, offsetof(struct thread_info, flags));
	DEFINE(TI_CPU, offsetof(struct thread_info, cpu));
	BLANK();

        DEFINE(TASK_BLOCKED, offsetof(struct task_struct, blocked));
        DEFINE(TASK_UID, offsetof(struct task_struct, uid));
        DEFINE(TASK_EUID, offsetof(struct task_struct, euid));
        DEFINE(TASK_GID, offsetof(struct task_struct, gid));
        DEFINE(TASK_EGID, offsetof(struct task_struct, egid));
        DEFINE(TASK_REAL_PARENT, offsetof(struct task_struct, real_parent));
        DEFINE(TASK_TGID, offsetof(struct task_struct, tgid));
        BLANK();

	DEFINE(SIZEOF_PT_REGS, sizeof(struct pt_regs));
	DEFINE(PT_PTRACED, PT_PTRACED);
	DEFINE(CLONE_VM, CLONE_VM);
	DEFINE(CLONE_UNTRACED, CLONE_UNTRACED);
	DEFINE(SIGCHLD, SIGCHLD);
	BLANK();

	DEFINE(HAE_CACHE, offsetof(struct alpha_machine_vector, hae_cache));
	DEFINE(HAE_REG, offsetof(struct alpha_machine_vector, hae_register));
}