lib: Add mlibc

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

1 files changed, 38 insertions, 0 deletions

diff --git a/lib/mlibc/sysdeps/linux/generic/entry.cpp b/lib/mlibc/sysdeps/linux/generic/entry.cpp
new file mode 100644
index 0000000..aa049ce
--- /dev/null
+++ b/lib/mlibc/sysdeps/linux/generic/entry.cpp
@@ -0,0 +1,38 @@
+#include <stdint.h>
+#include <stdlib.h>
+#include <bits/ensure.h>
+#include <mlibc/elf/startup.h>
+#include <sys/auxv.h>
+
+// defined by the POSIX library
+void __mlibc_initLocale();
+
+extern "C" uintptr_t *__dlapi_entrystack();
+extern "C" void __dlapi_enter(uintptr_t *);
+
+extern char **environ;
+static mlibc::exec_stack_data __mlibc_stack_data;
+
+size_t __hwcap;
+
+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(uintptr_t *entry_stack, int (*main_fn)(int argc, char *argv[], char *env[])) {
+	__dlapi_enter(entry_stack);
+	__hwcap = getauxval(AT_HWCAP);
+	auto result = main_fn(__mlibc_stack_data.argc, __mlibc_stack_data.argv, environ);
+	exit(result);
+}