From 4e7fcc27040da2ae72bf44b445a97bf9a981dd98 Mon Sep 17 00:00:00 2001
From: Kevin O'Connor <kevin@koconnor.net>
Date: Mon, 7 Apr 2025 12:45:54 -0400
Subject: [PATCH] check-software-div: Add a new build check for software divide

Update the build checks to include a check for unexpected software
divide operations.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
---
 scripts/check-software-div.sh | 22 ++++++++++++++++++++++
 scripts/ci-build.sh           |  1 +
 2 files changed, 23 insertions(+)
 create mode 100755 scripts/check-software-div.sh

diff --git a/scripts/check-software-div.sh b/scripts/check-software-div.sh
new file mode 100755
index 00000000..210e6e3c
--- /dev/null
+++ b/scripts/check-software-div.sh
@@ -0,0 +1,22 @@
+#!/bin/bash
+# Check if a binary appears to have a software library divide operator
+
+CFGFILE="$1"
+ELFOBJ="$2"
+OBJDUMP=objdump
+
+objdump -t ${ELFOBJ} | grep -Eq '\<(__[a-z0-9]*div|__[a-z0-9]*mod)'
+if [ $? -eq 0 ]; then
+
+    if grep -Eq '^CONFIG_HAVE_SOFTWARE_DIVIDE_REQUIRED=y$' ${CFGFILE}; then
+        echo ""
+        echo "Software divide detected and that is normal for this chip"
+        echo ""
+        exit 0
+    fi
+
+    echo ""
+    echo "ERROR: A software run-time divide operation was found"
+    echo ""
+    exit 99
+fi
diff --git a/scripts/ci-build.sh b/scripts/ci-build.sh
index ec37cbe0..b09b3ef7 100755
--- a/scripts/ci-build.sh
+++ b/scripts/ci-build.sh
@@ -56,6 +56,7 @@ for TARGET in test/configs/*.config ; do
     make olddefconfig
     make V=1
     size out/*.elf
+    ./scripts/check-software-div.sh .config out/*.elf
     finish_test mcu_compile "$TARGET"
     cp out/klipper.dict ${DICTDIR}/$(basename ${TARGET} .config).dict
 done