From 58c44c9a8feb8c258dcd85209149c16342995ec7 Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Fri, 1 Jul 2022 20:36:59 +0200
Subject: kernel: add the debug_klog syscall for tracking down process ids

---
 src/kernel/syscalls.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'src/kernel/syscalls.c')

diff --git a/src/kernel/syscalls.c b/src/kernel/syscalls.c
index 7040f6b..3cfc0ef 100644
--- a/src/kernel/syscalls.c
+++ b/src/kernel/syscalls.c
@@ -289,6 +289,14 @@ ret: // the macro is too stupid to handle returning pointers
 	return addr;
 }
 
+void _syscall_debug_klog(const void __user *buf, size_t len) {
+	static char kbuf[256];
+	if (len >= sizeof(kbuf)) len = sizeof(kbuf) - 1;
+	virt_cpy_from(process_current->pages, kbuf, buf, len);
+	kbuf[len] = '\0';
+	kprintf("[klog] %x\t%s\n", process_current->id, kbuf);
+}
+
 int _syscall(int num, int a, int b, int c, int d) {
 	switch (num) {
 		case _SYSCALL_EXIT:
@@ -324,6 +332,9 @@ int _syscall(int num, int a, int b, int c, int d) {
 		case _SYSCALL_MEMFLAG:
 			_syscall_memflag((userptr_t)a, b, c);
 			break;
+		case _SYSCALL_DEBUG_KLOG:
+			_syscall_debug_klog((userptr_t)a, b);
+			break;
 		default:
 			kprintf("unknown syscall ");
 			panic_unimplemented(); // TODO fail gracefully
-- 
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