[core] Add RTT control block address into interrupt vector table

Author: salkinium

src/modm/platform/core/cortex/module.lb

@@ -352,6 +352,7 @@ def build(env):
         "with_assert": env.has_module(":architecture:assert"),
         "with_fpu": env.get("float-abi", "soft") != "soft",
         "with_multicore": env.has_module(":platform:multicore"),
+        "with_rtt": env.has_module(":rtt"),
         "with_msplim": sum(c.isnumeric() for c in core) == 2,
         "enable_icache": env.get("enable_icache", False),
         "enable_dcache": enable_dcache,

src/modm/platform/core/cortex/vectors.c.in

@@ -25,13 +25,15 @@ void HardFault_Handler(void)					__attribute__((weak, alias("Undefined_Handler")
 {{ ("void " ~ vector_table[pos] ~ "(void)") | lbuild.pad(47)}}__attribute__((weak, alias("Undefined_Handler")));
 %%	endif
 %% endfor
-
+%#
 // ----------------------------------------------------------------------------
 typedef void (* const FunctionPointer)(void);
 
-// defined in the linkerscript
-extern uint32_t __main_stack_top[];
-
+extern uint32_t __main_stack_top[]; // from linkerscript
+%% if with_rtt
+extern uint32_t _SEGGER_RTT;        // from modm:rtt
+%% endif
+%#
 // Define the vector table
 modm_section(".vector_rom")
 FunctionPointer vectorsRom[] =
@@ -41,19 +43,21 @@ FunctionPointer vectorsRom[] =
 	NMI_Handler,							// -14: Non Maskable Interrupt handler
 	HardFault_Handler,						// -13: hard fault handler
 %% for pos in range(4 - 16, highest_irq)
-%% 	if pos in vector_table
+%% if pos in vector_table
 	{{ (vector_table[pos] ~ ",") | lbuild.pad(39) }}// {{ (pos|string).rjust(3) }}
-%% 	else
+%% elif with_rtt and pos == -8
+	(FunctionPointer)(((uint32_t)&_SEGGER_RTT) + 2ul),
+%% else
 	Undefined_Handler,						// {{ (pos|string).rjust(3) }}
-%% 	endif
+%% endif
 %% endfor
 };
 %% if vector_table_location == "ram"
 // reserve space for the remapped vector table in RAM
 modm_section(".vector_ram")
 FunctionPointer vectorsRam[sizeof(vectorsRom) / sizeof(FunctionPointer)];
 %% endif
-
+%#
 // ----------------------------------------------------------------------------
 // Ignore redeclaration of interrupt handlers in vendor headers
 #pragma GCC diagnostic push
@@ -64,7 +68,7 @@ FunctionPointer vectorsRam[sizeof(vectorsRom) / sizeof(FunctionPointer)];
 %% if with_assert
 #include <modm/architecture/interface/assert.h>
 %% endif
-
+%#
 void Undefined_Handler(void)
 {
 %% if with_assert