From d36487d9fd2c19b54a3b97bdf3562a17184711fe Mon Sep 17 00:00:00 2001
From: Aleksa Vuckovic <aleksav013@gmail.com>
Date: Tue, 29 Nov 2022 11:55:47 +0100
Subject: kernel panic

---
 kernel/src/sys/syscall.c   | 28 +++++++++++++++++++++++++++-
 kernel/src/sys/userspace.c |  8 ++++++--
 2 files changed, 33 insertions(+), 3 deletions(-)

(limited to 'kernel/src/sys')

diff --git a/kernel/src/sys/syscall.c b/kernel/src/sys/syscall.c
index 7f0e492..c526e39 100644
--- a/kernel/src/sys/syscall.c
+++ b/kernel/src/sys/syscall.c
@@ -1,9 +1,35 @@
 #include <libk/stdio.h>
 #include <syscall.h>
+#include <libk/string.h>
+#include <heap.h>
 
 void syscall_handler()
 {
 	uint64_t rax;
+	uint64_t rdi;
+	uint64_t rsi;
 	__asm__ volatile ("mov %%rax, %0;" : "=r"(rax) : :);
-	printf("syscall invoked with rax=0x%x\n", rax);
+	__asm__ volatile ("mov %%rdi, %0;" : "=r"(rdi) : :);
+	__asm__ volatile ("mov %%rsi, %0;" : "=r"(rsi) : :);
+	switch(rax) {
+		case SYSCALL_READ:
+			syscall_read();
+			break;
+		case SYSCALL_WRITE:
+			syscall_write((char*)rdi, rsi);
+			break;
+		default:
+			printf("invalid syscall (%d)\n", rax);
+	}
+}
+
+void syscall_read()
+{
+	printf("syscall_read()\n");
+}
+
+void syscall_write(char* buff, size_t count)
+{
+	printf("syscall_write()\n");
+	printf("buff = 0x%x, count = %d\n", buff, count);
 }
diff --git a/kernel/src/sys/userspace.c b/kernel/src/sys/userspace.c
index 111180a..fc89746 100644
--- a/kernel/src/sys/userspace.c
+++ b/kernel/src/sys/userspace.c
@@ -1,11 +1,15 @@
 #include <types.h>
 #include <userspace.h>
+#include <libk/stdio.h>
+#include <libk/string.h>
 
 void begin_userspace()
 {
+	// read
+	__asm__ volatile ("mov $0x0, %rax; syscall;");
+	// write
 	__asm__ volatile ("mov $0x1, %rax; syscall;");
-	__asm__ volatile ("mov $0x11, %rax; syscall;");
-	__asm__ volatile ("mov $0x111, %rax; syscall;");
+
 	while(true) {
 	}
 }
-- 
cgit v1.2.3