From 7ed7e6cb11e3693b65a108b27c139d95c5b533c0 Mon Sep 17 00:00:00 2001
From: Yannis Huber <yannis.h@hotmail.ch>
Date: Tue, 7 Jul 2020 09:37:00 +0200
Subject: [PATCH] risc-v: disable linker relaxations during gp init

---
 src/device/riscv/start.S | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/device/riscv/start.S b/src/device/riscv/start.S
index eee57fee..25217b35 100644
--- a/src/device/riscv/start.S
+++ b/src/device/riscv/start.S
@@ -9,7 +9,12 @@ _start:
     // Load the globals pointer. The program will load pointers relative to this
     // register, so it must be set to the right value on startup.
     // See: https://gnu-mcu-eclipse.github.io/arch/riscv/programmer/#the-gp-global-pointer-register
+    // Linker relaxations must be disabled to avoid the initialization beign
+    // relaxed with an uninitialized global pointer: mv gp, gp
+    .option push
+    .option norelax
     la gp,      __global_pointer$
+    .option pop
 
     // Jump to runtime.main
     call main