lib: Add mlibc

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

1 files changed, 35 insertions, 0 deletions

diff --git a/lib/mlibc/sysdeps/hyra/generic/entry.cpp b/lib/mlibc/sysdeps/hyra/generic/entry.cpp
new file mode 100644
index 0000000..d5129af
--- /dev/null
+++ b/lib/mlibc/sysdeps/hyra/generic/entry.cpp
@@ -0,0 +1,35 @@
+#include <bits/ensure.h>
+#include <mlibc/elf/startup.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+// defined by the POSIX library
+void __mlibc_initLocale();
+
+extern "C" uintptr_t *__dlapi_entrystack();
+
+extern char **environ;
+static mlibc::exec_stack_data __mlibc_stack_data;
+
+struct LibraryGuard {
+    LibraryGuard();
+};
+
+static LibraryGuard guard;
+
+LibraryGuard::LibraryGuard() {
+    __mlibc_initLocale();
+
+    // Parse the exec() stack.
+    mlibc::parse_exec_stack(__dlapi_entrystack(), &__mlibc_stack_data);
+    mlibc::set_startup_data(__mlibc_stack_data.argc, __mlibc_stack_data.argv,
+                            __mlibc_stack_data.envp);
+}
+
+extern "C" void __mlibc_entry(int (*main_fn)(int argc, char *argv[],
+                                             char *env[])) {
+    // TODO: call __dlapi_enter, otherwise static builds will break (see Linux
+    // sysdeps)
+    auto result = main_fn(__mlibc_stack_data.argc, __mlibc_stack_data.argv, environ);
+    exit(result);
+}