Calling global constructors

4 files changed, 35 insertions, 1 deletions

diff --git a/src/boot.s b/src/boot.s
index 172fd14..a043012 100644
--- a/src/boot.s
+++ b/src/boot.s
@@ -84,6 +84,7 @@ _start:
 	stack since (pushed 0 bytes so far), so the alignment has thus been
 	preserved and the call is well defined.
 	*/
+	call _init
 	call kernel_main
  
 	/*
diff --git a/src/crti.s b/src/crti.s
new file mode 100644
index 0000000..30dd4ea
--- /dev/null
+++ b/src/crti.s
@@ -0,0 +1,16 @@
+/* x86 crti.s */
+.section .init
+.global _init
+.type _init, @function
+_init:
+	push %ebp
+	movl %esp, %ebp
+	/* gcc will nicely put the contents of crtbegin.o's .init section here. */
+
+.section .fini
+.global _fini
+.type _fini, @function
+_fini:
+	push %ebp
+	movl %esp, %ebp
+	/* gcc will nicely put the contents of crtbegin.o's .fini section here. */
diff --git a/src/crtn.s b/src/crtn.s
new file mode 100644
index 0000000..1da795d
--- /dev/null
+++ b/src/crtn.s
@@ -0,0 +1,10 @@
+/* x86 crtn.s */
+.section .init
+	/* gcc will nicely put the contents of crtend.o's .init section here. */
+	popl %ebp
+	ret
+
+.section .fini
+	/* gcc will nicely put the contents of crtend.o's .fini section here. */
+	popl %ebp
+	ret
diff --git a/src/kernel.c b/src/kernel.c
index dd81d33..2c71ba4 100644
--- a/src/kernel.c
+++ b/src/kernel.c
@@ -111,14 +111,21 @@ void terminal_writestring(const char* data)
 {
     terminal_write(data, strlen(data));
 }
+
+char *rec;
+__attribute__ ((constructor)) void foo(void)
+{
+    rec="aleksa";
+}
  
 void kernel_main(void) 
 {
     terminal_initialize();
 
-    for(size_t i=0;i<80;i++)
+    for(size_t i=0;i<50;i++)
     {
 	for(size_t j=0;j<i;j++) terminal_writestring("#");
 	terminal_writestring("Hello, kernel World!\n");
     }
+    terminal_writestring(rec);
 }