Kernel/LibC: Add support for init_array and fini_array

kernel/arch/i686/boot.S

@@ -216,6 +216,14 @@ higher_half:
 	# call global constuctors
 	call _init
 
+	movl $__init_array_start, %ebx
+	jmp 2f
+ 1: movl (%ebx), %eax
+    call *%eax
+	addl $4, %ebx
+ 2: cmpl $__init_array_end, %ebx
+	jne 1b
+
 	# call to the kernel itself (clear ebp for stacktrace)
 	xorl %ebp, %ebp
 

kernel/arch/i686/crt0.S

@@ -1,23 +0,0 @@
-.section .text
-
-.global _start
-_start:
-	# Set up end of the stack frame linked list.
-	movl $0, %ebp
-	pushl %ebp # rip=0
-	pushl %ebp # rbp=0
-	movl %esp, %ebp
-
-	# Prepare signals, memory allocation, stdio and such.
-	#call initialize_standard_library
-
-	# Run the global constructors.
-	call _init
-
-	# Run main
-	call main
-
-	# Terminate the process with the exit code.
-	movl %eax, %edi
-	call exit
-.size _start, . - _start

kernel/arch/i686/crti.S

@@ -1,9 +1,9 @@
-/* x86 crti.s */
+/* i686 crti.s */
 .section .init
 .global _init
 .type _init, @function
 _init:
-	push %ebp
+	pushl %ebp
 	movl %esp, %ebp
 	/* gcc will nicely put the contents of crtbegin.o's .init section here. */
 
@@ -11,6 +11,14 @@ _init:
 .global _fini
 .type _fini, @function
 _fini:
-	push %ebp
+	pushl %ebp
 	movl %esp, %ebp
 	/* gcc will nicely put the contents of crtbegin.o's .fini section here. */
+
+.section .init_array
+.global __init_array_start
+__init_array_start:
+
+.section .fini_array
+.global __fini_array_start
+__fini_array_start:

kernel/arch/i686/crtn.S

@@ -1,4 +1,4 @@
-/* x86 crtn.s */
+/* i686 crtn.s */
 .section .init
 	/* gcc will nicely put the contents of crtend.o's .init section here. */
 	popl %ebp
@@ -8,3 +8,11 @@
 	/* gcc will nicely put the contents of crtend.o's .fini section here. */
 	popl %ebp
 	ret
+
+.section .init_array
+.global __init_array_end
+__init_array_end:
+
+.section .fini_array
+.global __fini_array_end
+__fini_array_end:

kernel/arch/x86_64/boot.S

@@ -216,6 +216,14 @@ higher_half:
 	# call global constuctors
 	call _init
 
+	movq $__init_array_start, %rbx
+	jmp 2f
+ 1: movq (%rbx), %rax
+    call *%rax
+	addq $8, %rbx
+ 2: cmpq $__init_array_end, %rbx
+	jne 1b
+
 	# call to the kernel itself (clear rbp for stacktrace)
 	xorq %rbp, %rbp
 

kernel/arch/x86_64/crti.S

@@ -14,3 +14,11 @@ _fini:
 	pushq %rbp
 	movq %rsp, %rbp
 	/* gcc will nicely put the contents of crtbegin.o's .fini section here. */
+
+.section .init_array
+.global __init_array_start
+__init_array_start:
+
+.section .fini_array
+.global __fini_array_start
+__fini_array_start:

kernel/arch/x86_64/crtn.S

@@ -8,3 +8,11 @@
 	/* gcc will nicely put the contents of crtend.o's .fini section here. */
 	popq %rbp
 	ret
+
+.section .init_array
+.global __init_array_end
+__init_array_end:
+
+.section .fini_array
+.global __fini_array_end
+__fini_array_end: