usr.bin: Add 'readcore' program

This commit introduces a new program called 'readcore'. This program
allows a user to debug crashed programs by passing in the path of a
coredump file.

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 50 insertions, 0 deletions

diff --git a/usr.bin/readcore/core.c b/usr.bin/readcore/core.c
new file mode 100644
index 0000000..6871d06
--- /dev/null
+++ b/usr.bin/readcore/core.c
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdint.h>
+#include <stdio.h>
+#include "frame.h"
+#include "core.h"
+
+void
+core_dumpframe(const struct core *core)
+{
+#if defined(__x86_64__)
+    printf(
+        "RDI=%p, RSI=%p\n"
+        "RCX=%p, RDX=%p\n"
+        "RAX=%p, RIP=%p\n",
+        core->frame.rdi, core->frame.rsi,
+        core->frame.rcx, core->frame.rdx,
+        core->frame.rax, core->frame.rip
+    );
+#else
+    printf("core_dumpframe: unsupported arch\n");
+#endif
+}