arch/um/os-Linux/tls.c

   1 #include <errno.h>
   2 #include <unistd.h>
   3 #include <sys/ptrace.h>
   4 #include <sys/syscall.h>
   5 #include <asm/ldt.h>
   6 #include "sysdep/tls.h"
   7 #include "uml-config.h"
   8
   9 /* TLS support - we basically rely on the host's one.*/
  10
  11 #ifndef PTRACE_GET_THREAD_AREA
  12 #define PTRACE_GET_THREAD_AREA 25
  13 #endif
  14
  15 #ifndef PTRACE_SET_THREAD_AREA
  16 #define PTRACE_SET_THREAD_AREA 26
  17 #endif
  18
  19 int os_set_thread_area(user_desc_t *info, int pid)
  20 {
  21         int ret;
  22
  23         ret = ptrace(PTRACE_SET_THREAD_AREA, pid, info->entry_number,
  24                      (unsigned long) info);
  25         if (ret < 0)
  26                 ret = -errno;
  27         return ret;
  28 }
  29
  30 int os_get_thread_area(user_desc_t *info, int pid)
  31 {
  32         int ret;
  33
  34         ret = ptrace(PTRACE_GET_THREAD_AREA, pid, info->entry_number,
  35                      (unsigned long) info);
  36         if (ret < 0)
  37                 ret = -errno;
  38         return ret;
  39 }