summaryrefslogtreecommitdiff
path: root/src
diff options
context:
space:
mode:
Diffstat (limited to 'src')
-rw-r--r--src/target/cortex_m3.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/src/target/cortex_m3.c b/src/target/cortex_m3.c
index adce4d9c..3bbe42c9 100644
--- a/src/target/cortex_m3.c
+++ b/src/target/cortex_m3.c
@@ -416,6 +416,21 @@ static int cortex_m3_poll(struct target *target)
return retval;
}
+ /* Recover from lockup. See ARMv7-M architecture spec,
+ * section B1.5.15 "Unrecoverable exception cases".
+ *
+ * REVISIT Is there a better way to report and handle this?
+ */
+ if (cortex_m3->dcb_dhcsr & S_LOCKUP) {
+ LOG_WARNING("%s -- clearing lockup after double fault",
+ target_name(target));
+ cortex_m3_write_debug_halt_mask(target, C_HALT, 0);
+ target->debug_reason = DBG_REASON_DBGRQ;
+
+ /* refresh status bits */
+ mem_ap_read_atomic_u32(swjdp, DCB_DHCSR, &cortex_m3->dcb_dhcsr);
+ }
+
if (cortex_m3->dcb_dhcsr & S_RESET_ST)
{
/* check if still in reset */