From 0d4345a9bf2623df079c50a3bc73cbb7deca1176 Mon Sep 17 00:00:00 2001
From: "John Wilbert M. Villamor" <lameguy64@gmail.com>
Date: Wed, 17 Jul 2019 11:30:07 +0800
Subject: Added C++ support, updated build instructions and makefiles,
 consolidated libc and libgcc (during build process), libraries now v0.12b and
 more

---
 libpsn00b/libc/start.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 libpsn00b/libc/start.c

(limited to 'libpsn00b/libc/start.c')

diff --git a/libpsn00b/libc/start.c b/libpsn00b/libc/start.c
new file mode 100644
index 0000000..c234e03
--- /dev/null
+++ b/libpsn00b/libc/start.c
@@ -0,0 +1,57 @@
+#include <stdio.h>
+#include <malloc.h>
+
+#define load_gp() __asm__ volatile ( \
+	"la $gp, _gp;" )
+
+extern int _end;
+extern int main(int argc, const char* argv[]);
+
+void _mem_init(void);
+
+
+static void _call_global_ctors(void)
+{
+	extern void (*__CTOR_LIST__[])(void);
+
+	// Constructors are called in reverse order of the list
+	int i;
+	for (i = (int)__CTOR_LIST__[0]; i >= 1; i--) {
+		// Each function handles one or more destructor (within
+		// file scope)
+		__CTOR_LIST__[i]();
+	}
+}
+
+static void _call_global_dtors(void)
+{
+	extern void (*__DTOR_LIST__[])(void);
+
+	/* Destructors in forward order */
+	int i;
+	for (i = 0; i < (int)__DTOR_LIST__[0]; i++) {
+			/* Each function handles one or more destructor (within
+			 * file scope) */
+			__DTOR_LIST__[i + 1]();
+	}
+}
+
+void _start(void) {
+	
+	// Load GP address
+	load_gp();
+	
+	// Mem init assembly function (clears BSS and InitHeap to _end which is
+	// not possible to do purely in C because the linker complains about
+	// relocation truncated to fit: R_MIPS_GPREL16 against `_end'
+	// Workaround is to do it in assembly because la pseudo-op doesn't use
+	// stupid gp relative addressing
+	_mem_init();
+	
+	_call_global_ctors();
+	
+	main(0, NULL);
+	
+	_call_global_dtors();
+	
+}
\ No newline at end of file
-- 
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