more fixes

syscalls/exit.c

@@ -0,0 +1,12 @@
+#include <zinnia/panic.h>
+#include <zinnia/syscall.h>
+
+struct syscall_ret sys_exit(int err) {
+    struct syscall_ret ret = {};
+
+    ret.errno = ENOSYS;
+
+    panic("sys::exit() not implemented!\n");
+
+    return ret;
+}

syscalls/meson.build

@@ -1,5 +1,7 @@
 kernel_sources += files(
     'archctl.c',
     'dispatch.c',
+    'exit.c',
+    'syslog.c',
     'uname.c',
 )

syscalls/syslog.c

@@ -0,0 +1,62 @@
+#include <zinnia/alloc.h>
+#include <zinnia/panic.h>
+#include <zinnia/print.h>
+#include <zinnia/syscall.h>
+#include <zinnia/usercopy.h>
+#include <stdint.h>
+
+enum syslog_kind : uintptr_t {
+    SYSLOG_EMERG = 0,
+    SYSLOG_ALERT = 1,
+    SYSLOG_CRIT = 2,
+    SYSLOG_ERR = 3,
+    SYSLOG_WARNING = 4,
+    SYSLOG_NOTICE = 5,
+    SYSLOG_INFO = 6,
+    SYSLOG_DEBUG = 7,
+};
+
+struct syscall_ret sys_syslog(enum syslog_kind kind, __user char* message, size_t len) {
+    struct syscall_ret ret = {};
+
+    const size_t buf_len = MIN(len + 1, 0x1000);
+    char* buf = mem_alloc(buf_len, ALLOC_NOZERO);
+    usercopy_read(buf, message, buf_len - 1);
+    buf[buf_len] = 0;
+
+    const char* log_level;
+    switch (kind) {
+    case SYSLOG_EMERG:
+        log_level = "emerg";
+        break;
+    case SYSLOG_ALERT:
+        log_level = "alert";
+        break;
+    case SYSLOG_CRIT:
+        log_level = "crit";
+        break;
+    case SYSLOG_ERR:
+        log_level = "err";
+        break;
+    case SYSLOG_WARNING:
+        log_level = "warning";
+        break;
+    case SYSLOG_NOTICE:
+        log_level = "notice";
+        break;
+    case SYSLOG_INFO:
+        log_level = "info";
+        break;
+    case SYSLOG_DEBUG:
+        log_level = "debug";
+        break;
+    default:
+        log_level = "invalid";
+    }
+
+    log("syslog(%s): %s\n", log_level, buf);
+
+    mem_free(buf);
+
+    return ret;
+}