[RTEMS Project] #4920: libdl does not support TLS

[RTEMS trac]

#4920: libdl does not support TLS
-------------------------+---------------------
 Reporter:  Chris Johns  |       Owner:  (none)
     Type:  defect       |      Status:  new
 Priority:  normal       |   Milestone:  6.1
Component:  lib/dl       |     Version:  6
 Severity:  blocker      |  Resolution:
 Keywords:               |  Blocked By:
 Blocking:               |
-------------------------+---------------------

Comment (by Joel Sherrill):

 The following table summarises the state of TLS support for each
 architecture listed previously. I based this on grep'ing for TLS in the
 score/cpu port directory and looking at generated assembly.

 ||Architecture||Mechanism||Support in RTEMS||
 ||bfin || ___emutls_get_address() || No ||
 ||i386 || %gs register || Yes ||
 ||lm32 || Unknown || No ||
 ||m68k || __m68k_read_tp() || Yes ||
 ||mips || Illegal Instruction Exception || No ||
 ||moxie || __emutls_get_address || No ||
 ||riscv || %tp register || Yes ||
 ||v850 || ___emutls_get_address || No ||

 I used this program to see what GCC generates.

 {{{
 __thread int i;

 int returni(void)
 {
   return i;
 }
 }}}

--
Ticket URL: <http://devel.rtems.org/ticket/4920#comment:6>
RTEMS Project <http://www.rtems.org/>
RTEMS Project