kernel: x86_64: rename x86

Rename the x86 arch-specific directory to x86_64, reflecting clang's
architecture selector flags.

Signed-off-by: Danny Holman <dholman@gymli.org>

1 files changed, 40 insertions, 0 deletions

diff --git a/kernel/arch/x86_64/asm/stack_trace.s b/kernel/arch/x86_64/asm/stack_trace.s
new file mode 100644
index 0000000..57d98b9
--- /dev/null
+++ b/kernel/arch/x86_64/asm/stack_trace.s
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2025 Danny Holman <dholman@gymli.org>
+ *
+ * This file is part of BoxOS, a free and open-source Unix-like operating
+ * system.
+ *
+ * BoxOS is free software; you can redistribute it and/or modify under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 2 of the License, or (at your option) any later
+ * version.
+ *
+ * BoxOS is distributed in the hope it will be useful, but WITHOUT ANY WARRANTY;
+ * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ * PARTICULAR PURPOSE. See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * BoxOS; if not, see <https://www.gnu.org/licenses/>.
+ */
+
+.section .text
+
+.global walk_stack
+walk_stack:
+        pushq %rbp
+        movq %rsp, %rbp
+
+        xorq %rdx, %rdx
+.next_frame:
+        cmpq %rsi, %rdx
+        jge .done
+        
+        movq 8(%rbp), %rax
+        movq %rax, (%rdi, %rdx, 8)
+
+        incq %rdx
+
+        movq (%rbp), %rbp
+        jmp .next_frame
+.done:
+        ret