source: gpfs_3.1_ker2.6.20/lpp/mmfs/src/gpl-linux/power/ss_ppc.c @ 108

/* @(#)73       1.5  src/avs/fs/mmfs/ts/kernext/gpl-linux/power/ss_ppc.c, mmfs, avs_rgpfs24, rgpfs240610b 7/28/05 10:38:39 */
/*
 * Implementation of shared segment for GPFS daemon and GPFS kernel code.
 *
 */

#include <Shark-gpl.h>
#include <cxiSystem.h>
#include <cxiSharedSeg.h>

#include <linux/types.h>
#include <linux/version.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/types.h>
#if LINUX_KERNEL_VERSION < 2060000
#include <linux/compatmac.h>
#endif

#include <verdep.h>

int
kxSaveThreadInfo(int tid, void* regP)
{
  struct task_struct *g, *t;
  int rc = ENOENT;
  unsigned long sp;

  read_lock(&tasklist_lock);
  DO_EACH_THREAD(g,t)
  {
    if (t->pid != tid)
      continue;

    rc = 0;
    goto found_it;
  } WHILE_EACH_THREAD(g,t);
found_it:
  read_unlock(&tasklist_lock);
  if (rc == 0)
  {
    if (t->thread.regs != NULL)
      copy_to_user(regP, t->thread.regs, sizeof(struct pt_regs));
    else
    {
#if LINUX_KERNEL_VERSION < 2060000
      sp = (unsigned long)t + sizeof(union task_union);
#else
      /* ??? */
      sp = (unsigned long)t->thread_info + THREAD_SIZE;
#endif
      sp -= sizeof(struct pt_regs);
      copy_to_user(regP, (void*)sp, sizeof(struct pt_regs));
    }
  }
  return rc;
}