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 /* In TT mode, this should be called only by the tracing thread, and makes sense
  12  * only for PTRACE_SET_THREAD_AREA. In SKAS mode, it's used normally.
  13  *
  14  */
  15
  16 #ifndef PTRACE_GET_THREAD_AREA
  17 #define PTRACE_GET_THREAD_AREA 25
  18 #endif
  19
  20 #ifndef PTRACE_SET_THREAD_AREA
  21 #define PTRACE_SET_THREAD_AREA 26
  22 #endif
  23
  24 int os_set_thread_area(user_desc_t *info, int pid)
  25 {
  26         int ret;
  27
  28         ret = ptrace(PTRACE_SET_THREAD_AREA, pid, info->entry_number,
  29                      (unsigned long) info);
  30         if (ret < 0)
  31                 ret = -errno;
  32         return ret;
  33 }
  34
  35 #ifdef UML_CONFIG_MODE_SKAS
  36
  37 int os_get_thread_area(user_desc_t *info, int pid)
  38 {
  39         int ret;
  40
  41         ret = ptrace(PTRACE_GET_THREAD_AREA, pid, info->entry_number,
  42                      (unsigned long) info);
  43         if (ret < 0)
  44                 ret = -errno;
  45         return ret;
  46 }
  47
  48 #endif
  49
  50 #ifdef UML_CONFIG_MODE_TT
  51 #include "linux/unistd.h"
  52
  53 int do_set_thread_area_tt(user_desc_t *info)
  54 {
  55         int ret;
  56
  57         ret = syscall(__NR_set_thread_area,info);
  58         if (ret < 0) {
  59                 ret = -errno;
  60         }
  61         return ret;
  62 }
  63
  64 int do_get_thread_area_tt(user_desc_t *info)
  65 {
  66         int ret;
  67
  68         ret = syscall(__NR_get_thread_area,info);
  69         if (ret < 0) {
  70                 ret = -errno;
  71         }
  72         return ret;
  73 }
  74
  75 #endif /* UML_CONFIG_MODE_TT */