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asm-offsets.c

/*
 * This program is used to generate definitions needed by
 * assembly language modules.
 *
 * We use the technique used in the OSF Mach kernel code:
 * generate asm statements containing #defines,
 * compile this file to assembler, and then extract the
 * #defines from the assembly-language output.
 */

#include <linux/stddef.h>
#include <linux/sched.h>
#include <linux/kernel_stat.h>
#include <linux/ptrace.h>
#include <linux/hardirq.h>
#include <asm/irq.h>
#include <asm/errno.h>

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

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

int main (void)
{
      /* offsets into the task struct */
      DEFINE (TASK_STATE, offsetof (struct task_struct, state));
      DEFINE (TASK_FLAGS, offsetof (struct task_struct, flags));
      DEFINE (TASK_PTRACE, offsetof (struct task_struct, ptrace));
      DEFINE (TASK_BLOCKED, offsetof (struct task_struct, blocked));
      DEFINE (TASK_THREAD, offsetof (struct task_struct, thread));
      DEFINE (TASK_THREAD_INFO, offsetof (struct task_struct, stack));
      DEFINE (TASK_MM, offsetof (struct task_struct, mm));
      DEFINE (TASK_ACTIVE_MM, offsetof (struct task_struct, active_mm));
      DEFINE (TASK_PID, offsetof (struct task_struct, pid));

      /* offsets into the kernel_stat struct */
      DEFINE (STAT_IRQ, offsetof (struct kernel_stat, irqs));


      /* signal defines */
      DEFINE (SIGSEGV, SIGSEGV);
      DEFINE (SEGV_MAPERR, SEGV_MAPERR);
      DEFINE (SIGTRAP, SIGTRAP);
      DEFINE (SIGCHLD, SIGCHLD);
      DEFINE (SIGILL, SIGILL);
      DEFINE (TRAP_TRACE, TRAP_TRACE);

      /* ptrace flag bits */
      DEFINE (PT_PTRACED, PT_PTRACED);
      DEFINE (PT_DTRACE, PT_DTRACE);

      /* error values */
      DEFINE (ENOSYS, ENOSYS);

      /* clone flag bits */
      DEFINE (CLONE_VFORK, CLONE_VFORK);
      DEFINE (CLONE_VM, CLONE_VM);

      return 0;
}

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