From 5385b0e2a53ea8dd46e6a4f7990397d1251e4511 Mon Sep 17 00:00:00 2001
From: Marnix Klooster <marnix@users.noreply.github.com>
Date: Mon, 3 Feb 2025 00:04:38 +0100
Subject: [PATCH] Enable 'unwind_tables' for all platforms (#373)

For ARM-based embedded firmware this requires
explicit declaration of `ARM.extab` sections in linker.d,
otherwise the exception tables can incorrectly end up in RAM.
(See https://github.com/ziglang/zig/issues/22685.)
---
 build.zig                        | 1 +
 tools/generate_linker_script.zig | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/build.zig b/build.zig
index f4499992..cc9d0ba9 100644
--- a/build.zig
+++ b/build.zig
@@ -463,6 +463,7 @@ pub fn MicroBuild(port_select: PortSelect) type {
                     .linkage = .static,
                     .root_source_file = mb.core_dep.path("src/start.zig"),
                     .strip = options.strip,
+                    .unwind_tables = true,
                 }),
                 .app_mod = app_mod,
                 .target = target,
diff --git a/tools/generate_linker_script.zig b/tools/generate_linker_script.zig
index 308b055e..8210c5be 100644
--- a/tools/generate_linker_script.zig
+++ b/tools/generate_linker_script.zig
@@ -107,6 +107,10 @@ pub fn main() !void {
 
         switch (program_args.cpu_arch) {
             .arm, .thumb => try writer.writeAll(
+                \\  .ARM.extab : {
+                \\      *(.ARM.extab* .gnu.linkonce.armextab.*)
+                \\  } >flash0
+                \\
                 \\  .ARM.exidx : {
                 \\      *(.ARM.exidx* .gnu.linkonce.armexidx.*)
                 \\  } >flash0