From 5a00e2e36c42fe456c447fad0ecb4b19eab6dde4 Mon Sep 17 00:00:00 2001
From: Kaspar Schleiser <kaspar@schleiser.de>
Date: Wed, 29 Jul 2020 12:00:30 +0200
Subject: [PATCH] cpu/msp430_common: use __stack for ISR stacks

---
 cpu/msp430_common/include/cpu.h | 8 ++------
 cpu/msp430_common/irq.c         | 2 --
 2 files changed, 2 insertions(+), 8 deletions(-)

diff --git a/cpu/msp430_common/include/cpu.h b/cpu/msp430_common/include/cpu.h
index 6af17c0d1d..5b23da760f 100644
--- a/cpu/msp430_common/include/cpu.h
+++ b/cpu/msp430_common/include/cpu.h
@@ -49,11 +49,6 @@ extern "C" {
  */
 extern volatile int __irq_is_in;
 
-/**
- * @brief   Memory used as stack for the interrupt context
- */
-extern char __isr_stack[ISR_STACKSIZE];
-
 /**
  * @brief   Save the current thread context from inside an ISR
  */
@@ -102,8 +97,9 @@ static inline void __attribute__((always_inline)) __restore_context(void)
  */
 static inline void __attribute__((always_inline)) __enter_isr(void)
 {
+    extern char __stack;    /* defined by linker script to end of RAM */
     __save_context();
-    __asm__("mov.w %0,r1" : : "i"(__isr_stack + ISR_STACKSIZE));
+    __asm__("mov.w %0,r1" : : "i"(&__stack));
     __irq_is_in = 1;
 }
 
diff --git a/cpu/msp430_common/irq.c b/cpu/msp430_common/irq.c
index 86abfd7c48..f6bcc1ad66 100644
--- a/cpu/msp430_common/irq.c
+++ b/cpu/msp430_common/irq.c
@@ -23,5 +23,3 @@
 #include "cpu.h"
 
 volatile int __irq_is_in = 0;
-
-char __isr_stack[ISR_STACKSIZE];