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:

script/build.sh

@@ -104,7 +104,7 @@ case $1 in
 		run_qemu -nographic $QEMU_ACCEL
 		;;
 	qemu-debug)
-		run_qemu -serial stdio -d int -no-reboot
+		run_qemu -serial stdio -d int -action reboot=shutdown,shutdown=pause
 		;;
 	bochs)
 		run_bochs

toolchain/build.sh

@@ -92,7 +92,7 @@ build_binutils () {
 		--target="$BANAN_TOOLCHAIN_TRIPLE" \
 		--prefix="$BANAN_TOOLCHAIN_PREFIX" \
 		--with-sysroot="$BANAN_SYSROOT" \
-		--disable-initfini-array \
+		--enable-initfini-array \
 		--disable-nls \
 		--disable-werror
 
@@ -119,7 +119,7 @@ build_gcc () {
 		--target="$BANAN_TOOLCHAIN_TRIPLE" \
 		--prefix="$BANAN_TOOLCHAIN_PREFIX" \
 		--with-sysroot="$BANAN_SYSROOT" \
-		--disable-initfini-array \
+		--enable-initfini-array \
 		--disable-nls \
 		--enable-languages=c,c++
 

userspace/libraries/LibC/arch/i686/crt0.S

@@ -21,6 +21,14 @@ _start:
 	# call global constructors
 	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 main
 	movl 0(%esp), %eax
 	xchgl %eax, 8(%esp)

userspace/libraries/LibC/arch/i686/crti.S

@@ -14,3 +14,11 @@ _fini:
 	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:

userspace/libraries/LibC/arch/i686/crtn.S

@@ -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:

userspace/libraries/LibC/arch/x86_64/crt0.S

@@ -22,6 +22,14 @@ _start:
 	# call global constructors
 	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 main
 	movq 16(%rsp), %rdi
 	movq  8(%rsp), %rsi

userspace/libraries/LibC/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:

userspace/libraries/LibC/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:

userspace/libraries/LibC/malloc.cpp

@@ -48,7 +48,7 @@ struct malloc_pool_t
 
 static malloc_pool_t s_malloc_pools[s_malloc_pool_count];
 
-void init_malloc()
+void _init_malloc()
 {
 	size_t pool_size = s_malloc_pool_size_initial;
 	for (size_t i = 0; i < s_malloc_pool_count; i++)

userspace/libraries/LibC/stdio.cpp

@@ -15,20 +15,20 @@
 
 struct FILE
 {
-	int fd			{ -1 };
-	mode_t mode		{ 0 };
-	int buffer_type	{ _IOLBF };
-	bool eof		{ false };
-	bool error		{ false };
+	int fd;
+	mode_t mode;
+	int buffer_type;
+	bool eof;
+	bool error;
 
-	int pid			{ -1 };
+	int pid;
 
-	int unget_char { EOF };
+	int unget_char;
 
-	unsigned char inline_buffer_storage[BUFSIZ] {};
-	unsigned char* buffer = inline_buffer_storage;
-	uint32_t buffer_size = BUFSIZ;
-	uint32_t buffer_index { 0 };
+	unsigned char inline_buffer_storage[BUFSIZ];
+	unsigned char* buffer;
+	uint32_t buffer_size;
+	uint32_t buffer_index;
 };
 
 struct ScopeLock
@@ -47,18 +47,46 @@ struct ScopeLock
 	FILE* m_file;
 };
 
-static FILE s_files[FOPEN_MAX] {
-	{ .fd = STDIN_FILENO,	.mode = O_RDONLY },
-	{ .fd = STDOUT_FILENO,	.mode = O_WRONLY },
-	{ .fd = STDERR_FILENO,	.mode = O_WRONLY, .buffer_type = _IONBF },
-	{ .fd = STDDBG_FILENO,	.mode = O_WRONLY },
-};
+static FILE s_files[FOPEN_MAX];
 
 FILE* stdin  = &s_files[0];
 FILE* stdout = &s_files[1];
 FILE* stderr = &s_files[2];
 FILE* stddbg = &s_files[3];
 
+static void init_closed_file(FILE* file)
+{
+	file->fd           = -1;
+	file->mode         = 0;
+	file->buffer_type  = _IOLBF;
+	file->eof          = false;
+	file->error        = false;
+	file->pid          = -1;
+	file->unget_char   = EOF;
+	file->buffer       = file->inline_buffer_storage;
+	file->buffer_size  = BUFSIZ;
+	file->buffer_index = 0;
+}
+
+void _init_stdio()
+{
+	for (size_t i = 0; i < FOPEN_MAX; i++)
+		init_closed_file(&s_files[i]);
+
+	s_files[STDIN_FILENO].fd   = STDIN_FILENO;
+	s_files[STDIN_FILENO].mode = O_RDONLY;
+
+	s_files[STDOUT_FILENO].fd   = STDOUT_FILENO;
+	s_files[STDOUT_FILENO].mode = O_WRONLY;
+
+	s_files[STDERR_FILENO].fd   = STDERR_FILENO;
+	s_files[STDERR_FILENO].mode = O_WRONLY;
+	s_files[STDERR_FILENO].buffer_type = _IONBF;
+
+	s_files[STDDBG_FILENO].fd   = STDDBG_FILENO;
+	s_files[STDDBG_FILENO].mode = O_WRONLY;
+}
+
 void clearerr(FILE* file)
 {
 	ScopeLock _(file);
@@ -79,7 +107,7 @@ int fclose(FILE* file)
 	ScopeLock _(file);
 	(void)fflush(file);
 	int ret = (close(file->fd) == -1) ? EOF : 0;
-	file = {};
+	init_closed_file(file);
 	return ret;
 }
 

userspace/libraries/LibC/unistd.cpp

@@ -15,10 +15,12 @@
 
 char** environ;
 
-extern void init_malloc();
+extern void _init_malloc();
+extern void _init_stdio();
 extern "C" void _init_libc(char** _environ)
 {
-	init_malloc();
+	_init_malloc();
+	_init_stdio();
 
 	if (!_environ)
 		return;