From df88f5645085dd8de2ff8206bda75e13d10db9b6 Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop@gmail.com>
Date: Thu, 14 May 2026 09:37:08 -0400
Subject: [PATCH] Add stackdump source

---
 .gitignore  |  1 +
 Makefile    |  2 ++
 stackdump.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 57 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Makefile
 create mode 100644 stackdump.c

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..a86233a
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/stackdump
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..05a2e0b
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,2 @@
+stackdump: stackdump.c Makefile
+	clang -o $@ -Wall -g stackdump.c -lunwind
diff --git a/stackdump.c b/stackdump.c
new file mode 100644
index 0000000..b6d7a82
--- /dev/null
+++ b/stackdump.c
@@ -0,0 +1,54 @@
+#define UNW_LOCAL_ONLY
+#include <libunwind.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+// Function to print the current stack trace
+void show_backtrace(void)
+{
+    unw_cursor_t cursor;
+    unw_context_t context;
+    unw_word_t ip, sp;
+    char sym[256];
+    unw_word_t offset;
+
+    // Initialize cursor to current frame for local unwinding
+    unw_getcontext(&context);
+    unw_init_local(&cursor, &context);
+
+    printf("--- Stack Trace ---\n");
+    // Unwind frames one by one
+    while (unw_step(&cursor) > 0) {
+        unw_get_reg(&cursor, UNW_REG_IP, &ip);
+        unw_get_reg(&cursor, UNW_REG_SP, &sp);
+        
+        // Try to get the function name
+        if (unw_get_proc_name(&cursor, sym, sizeof(sym), &offset) == 0) {
+            printf("0x%lx: (%s+0x%lx)\n", (long)ip, sym, (long)offset);
+        } else {
+            printf("0x%lx: -- no symbol name found --\n", (long)ip);
+        }
+    }
+    printf("-------------------\n");
+}
+
+void function_c(void)
+{
+    show_backtrace();
+}
+
+void function_b(void)
+{
+    function_c();
+}
+
+void function_a(void)
+{
+    function_b();
+}
+
+int main(int argc, char **argv)
+{
+    function_a();
+    return 0;
+}