Fix several segv issues and improve x86_64 startup code

1 files changed, 40 insertions, 0 deletions

diff --git a/lib/libc/internal/init/init.c b/lib/libc/internal/init/init.c
new file mode 100644
index 00000000..36e66ee4
--- /dev/null
+++ b/lib/libc/internal/init/init.c
@@ -0,0 +1,40 @@
+#include <libc.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <sys/cdefs.h>
+
+extern void __init_vdso(void);
+
+struct libc __libc = { 0 };
+char **environ;
+char *__progname;
+
+extern int main(int, char **, char **);
+
+__used void __init(uintptr_t *rsp)
+{
+	char **argv;
+	size_t *auxv;
+	int argc;
+
+	argc = (int)(*rsp);
+	argv = (char **)(++rsp);
+
+	rsp += argc;
+
+	environ = (char **)(++rsp);
+	__progname = argv[0];
+
+	while (*rsp)
+		rsp++;
+
+	auxv = (size_t *)++rsp;
+
+	for (size_t i = 0; auxv[i]; i += 2)
+		__libc.auxv[auxv[i]] = auxv[i + 1];
+
+	__init_vdso();
+
+	exit(main(argc, argv, environ));
+}