lots and lots of userspace stuff

1 files changed, 28 insertions, 0 deletions

diff --git a/euler/source/entry.cpp b/euler/source/entry.cpp
new file mode 100644
index 0000000..e79209c
--- /dev/null
+++ b/euler/source/entry.cpp
@@ -0,0 +1,28 @@
+#include <euler/syscall.hpp>
+#include <cstdlib>
+#include <string>
+
+int main(int argc, char **argv);
+
+extern "C" [[noreturn]] void _start() {
+
+  auto argc_raw = euler::syscall::try_get_environment_variable("ARGC");
+  int argc = argc_raw.has_value() ? std::stoi(argc_raw.value()) : 0;
+
+  std::vector<std::string> argv;
+
+  for (int i = 0; i < argc; ++i) {
+    std::string arg_name = std::string("ARGV") + std::to_string(i);
+    auto arg_raw = euler::syscall::try_get_environment_variable(arg_name);
+    argv.push_back(arg_raw.has_value() ? arg_raw.value() : "");
+  }
+
+  std::vector<char *> c_argv(argc);
+  for (int i = 0; i < argc; ++i)
+    c_argv[i] = argv[i].data();
+
+  int exit_code = main(argc, c_argv.data());
+
+  euler::syscall::end_this_process(exit_code);
+
+}