From c9b921f6ce1ae5f2c3dc281df6b972763e5e09f5 Mon Sep 17 00:00:00 2001
From: DrZlo13 <who.just.the.doctor@gmail.com>
Date: Thu, 29 Oct 2020 08:41:44 +0300
Subject: [PATCH] added openocd support (#211)

openocd needs a visible uxTopUsedPriority symbol for freertos, but freertos is discarding it in v7, so I add the helper file manually
---
 firmware/targets/f2/Src/freertos-openocd.c | 21 +++++++++++++++++++++
 make/toolchain.mk                          |  2 +-
 2 files changed, 22 insertions(+), 1 deletion(-)
 create mode 100644 firmware/targets/f2/Src/freertos-openocd.c

diff --git a/firmware/targets/f2/Src/freertos-openocd.c b/firmware/targets/f2/Src/freertos-openocd.c
new file mode 100644
index 00000000..abde4411
--- /dev/null
+++ b/firmware/targets/f2/Src/freertos-openocd.c
@@ -0,0 +1,21 @@
+
+/*
+ * Since at least FreeRTOS V7.5.3 uxTopUsedPriority is no longer
+ * present in the kernel, so it has to be supplied by other means for
+ * OpenOCD's threads awareness.
+ *
+ * Add this file to your project, and, if you're using --gc-sections,
+ * ``--undefined=uxTopUsedPriority'' (or
+ * ``-Wl,--undefined=uxTopUsedPriority'' when using gcc for final
+ * linking) to your LDFLAGS; same with all the other symbols you need.
+ */
+
+#include "FreeRTOS.h"
+
+#ifdef __GNUC__
+#define USED __attribute__((used))
+#else
+#define USED
+#endif
+
+const int USED uxTopUsedPriority = configMAX_PRIORITIES - 1;
\ No newline at end of file
diff --git a/make/toolchain.mk b/make/toolchain.mk
index ad43c369..ef660c0e 100644
--- a/make/toolchain.mk
+++ b/make/toolchain.mk
@@ -23,4 +23,4 @@ endif
 
 CFLAGS += -MMD -MP -MF"$(@:%.o=%.d)"
 CPPFLAGS = -fno-threadsafe-statics
-LDFLAGS	+= -Wl,-Map=$(OBJ_DIR)/$(PROJECT).map,--cref -Wl,--gc-sections
+LDFLAGS	+= -Wl,-Map=$(OBJ_DIR)/$(PROJECT).map,--cref -Wl,--gc-sections -Wl,--undefined=uxTopUsedPriority