Merge pull request #14718 from bergzand/pr/cortexm_common/hard_fault_add_thread_info

cortexm_common: Add thread info to hard fault handler

cpu/cortexm_common/vectors_cortexm.c

@@ -32,6 +32,7 @@
 #include "board.h"
 #include "mpu.h"
 #include "panic.h"
+#include "sched.h"
 #include "vectors_cortexm.h"
 #ifdef MODULE_PUF_SRAM
 #include "puf_sram.h"
@@ -372,6 +373,20 @@ __attribute__((used)) void hard_fault_handler(uint32_t* sp, uint32_t corrupted,
     printf("EXC_RET: 0x%08" PRIx32 "\n", exc_return);
 
     if (!corrupted) {
+        /* Test if the EXC_RETURN returns to thread mode,
+         * to check if the hard fault happened in ISR context */
+        if (exc_return & 0x08) {
+            kernel_pid_t active_pid = thread_getpid();
+            printf("Active thread: %"PRIi16" \"%s\"\n",
+                   active_pid, thread_getname(active_pid));
+        }
+        else {
+            /* Print the interrupt number, NMI being -14, hardfault is -13,
+             * IRQ0 is 0 and so on */
+            uint32_t psr = sp[7];  /* Program status register. */
+            printf("Hard fault occured in ISR number %d\n",
+                   (int)(psr & 0xff) - 16);
+        }
         puts("Attempting to reconstruct state for debugging...");
         printf("In GDB:\n  set $pc=0x%" PRIx32 "\n  frame 0\n  bt\n", pc);
         int stack_left = _stack_size_left(HARDFAULT_HANDLER_REQUIRED_STACK_SPACE);

tests/pkg_fatfs_vfs/Makefile.ci

@@ -9,6 +9,7 @@ BOARD_INSUFFICIENT_MEMORY := \
     nucleo-f031k6 \
     nucleo-l031k6 \
     nucleo-f042k6 \
+    nucleo-l031k6 \
     stm32f030f4-demo \
     telosb \
     z1 \