From 2b09078b928b8f309d3638ca7b3dc47c9718c34a Mon Sep 17 00:00:00 2001
From: Aidan MacDonald <amachronic@protonmail.com>
Date: Sun, 25 Jan 2026 22:26:53 +0000
Subject: [PATCH] stm32h7: set 8-byte alignment on main and irq stack

Explicitly set 8-byte alignment as per the AAPCS, which
says the stack should be 8-byte aligned at a public ABI
boundary.

Change-Id: Ie60b664718119ea576e7c6b5efaac011eb907531
---
 firmware/target/arm/stm32/app.lds  | 2 +-
 firmware/target/arm/stm32/boot.lds | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/firmware/target/arm/stm32/app.lds b/firmware/target/arm/stm32/app.lds
index 1fbcd140cd..fc8bd381f7 100644
--- a/firmware/target/arm/stm32/app.lds
+++ b/firmware/target/arm/stm32/app.lds
@@ -21,7 +21,7 @@ SECTIONS
         *(.icode*);
     } > ITCM
 
-    .stack (NOLOAD) :
+    .stack (NOLOAD) : ALIGN(8)
     {
         irqstackbegin = .;
         . += 0x400;
diff --git a/firmware/target/arm/stm32/boot.lds b/firmware/target/arm/stm32/boot.lds
index 0994787666..06d3471303 100644
--- a/firmware/target/arm/stm32/boot.lds
+++ b/firmware/target/arm/stm32/boot.lds
@@ -42,7 +42,7 @@ SECTIONS
         _bssend = .;
     } > SRAM_AXI
 
-    .stack (NOLOAD) : ALIGN(4)
+    .stack (NOLOAD) : ALIGN(8)
     {
         irqstackbegin = .;
         . += 0x400;