Merge pull request #14422 from maribu/cortexm_thread_arch

cpu/cortexm_common: Fixes for thread_arch.c and dropped workaround

cpu/cortexm_common/Makefile

@@ -1,10 +1,3 @@
-# thread_arch.c's inline assembler breaks when compiling with link time
-# optimization. see https://github.com/RIOT-OS/RIOT/issues/5774.
-SRC_NOLTO += thread_arch.c
-
-# see https://github.com/RIOT-OS/RIOT/issues/5775.
-SRC_NOLTO += vectors_cortexm.c
-
 DIRS = periph
 
 include $(RIOTBASE)/Makefile.base

cpu/cortexm_common/thread_arch.c

@@ -372,6 +372,8 @@ void __attribute__((naked)) __attribute__((used)) isr_pendsv(void) {
                                            * causes end of exception*/
 #endif
     /* {r0-r3,r12,LR,PC,xPSR,s0-s15,FPSCR} are restored automatically on exception return */
+     ".ltorg                           \n" /* literal pool needed to access
+                                            * sched_active_thread */
     );
 }