rpi: Rework linker script

* Add some missing stuff, be more exact with
  stack and fill with 0xBEBEBEBE
* Ensure .init_array is called with .ctors to ensure
  static constructors are called.

src/system/boot/platform/raspberrypi_arm/entry.S

@@ -4,11 +4,15 @@ _start:
 
 .balign 0x8000, 0
 jmp_loader:
-	/* Set up 1MB C Stack Space */
-	mov sp, #0x100000
-	mov r4, #0
-
 	/* Start Haiku loader */
+
+	/* For Thumb code? */
+	/*
+	ldr r12, =pi_start
+	mov lr, pc
+	bx r12
+	*/
+
 	b pi_start
 
 	/* Cause exception if loader returns */

src/system/boot/platform/raspberrypi_arm/start.c

@@ -27,8 +27,12 @@
 // GCC defined globals
 extern void (*__ctor_list)(void);
 extern void (*__ctor_end)(void);
+extern void (*__dtor_list)(void);
+extern void (*__dtor_end)(void);
 extern uint8 __bss_start;
-extern uint8 _end;
+extern uint8 __bss_end;
+extern uint8 __stack_start;
+extern uint8 __stack_end;
 
 extern int main(stage2_args *args);
 void _start(void);
@@ -37,14 +41,20 @@ void _start(void);
 static void
 clear_bss(void)
 {
-	memset(&__bss_start, 0, &_end - &__bss_start);
+	memset(&__bss_start, 0, &__bss_end - &__bss_start);
+}
+
+
+static void
+fill_stack(void)
+{
+	memset(&__stack_start, 0xBEBEBEBE, &__stack_end - &__stack_start);
 }
 
 
 static void
 call_ctors(void)
 {
-	#warning BUG: constructors don't get called!
 	void (**f)(void);
 
 	for (f = &__ctor_list; f < &__ctor_end; f++) {
@@ -92,6 +102,7 @@ pi_start(void)
 	stage2_args args;
 
 	clear_bss();
+	fill_stack();
 	call_ctors();
 
 	cpu_init();

src/system/ldscripts/arm/boot_loader_raspberrypi_arm.ld

@@ -1,18 +1,40 @@
 OUTPUT_FORMAT("elf32-littlearm", "elf32-littlearm", "elf32-littlearm")
 OUTPUT_ARCH(arm)
-
 ENTRY(_start)
+
+C_STACK_SIZE	= 1048576;
+IRQ_STACK_SIZE	= 0;
+FIQ_STACK_SIZE	= 0;
+SVC_STACK_SIZE	= 0;
+ABT_STACK_SIZE	= 0;
+UND_STACK_SIZE	= 0;
+
 SECTIONS
 {
 	. = BOARD_LOADER_BASE;
 
 	/* text/read-only data */
-	.text :	{ *(.text .gnu.linkonce.t.*) }
+	.text :	{
+		CREATE_OBJECT_SYMBOLS
+		*(.text .text.* .gnu.linkonce.t.*)
+		*(.plt)
+		*(.gnu.warning)
+	}
 
 	. = ALIGN(0x4);
+	.ctors : {
 		__ctor_list = .;
-	.ctors : { *(.ctors) }
+		*(.init_array);
+		*(.ctors);
 		__ctor_end = .;
+	}
+
+	.dtors : {
+		__dtor_list = .;
+		*(.fini_array);
+		*(.dtors);
+		__dtor_end = .;
+	}
 
 	.rodata : { *(.rodata .rodata.*) }
 
@@ -27,14 +49,51 @@ SECTIONS
 	__exidx_end = .;
 
 	/* uninitialized data (in same segment as writable data) */
+	.bss : {
 		__bss_start = .;
-	.bss : { *(.bss) }
+		*(.shbss)
+		*(.bss .bss.* .gnu.linkonce.b.*)
+		*(COMMON)
+		. = ALIGN(0x4);
+		__bss_end = .;
+	}
+
+	.stack : {
+		__stack_start = .;
+
+		. += IRQ_STACK_SIZE;
+		. = ALIGN(0x4);
+		__irq_stack_top = .;
+
+		. += FIQ_STACK_SIZE;
+		. = ALIGN(0x4);
+		__fiq_stack_top = .;
+
+		. += SVC_STACK_SIZE;
+		. = ALIGN(0x4);
+		__svc_stack_top = .;
+
+		. += ABT_STACK_SIZE;
+		. = ALIGN(0x4);
+		__abt_stack_top = .;
+
+		. += UND_STACK_SIZE;
+		. = ALIGN(0x4);
+		__und_stack_top = .;
+
+		. += C_STACK_SIZE;
+		. = ALIGN(0x4);
+		__c_stack_top = .;
+
+		__stack_end = .;
+	}
 
-	. = ALIGN(0x1000);
 	_end = . ;
+
 	/* Stabs debugging sections.  */
 	.stab 0 : { *(.stab) }
 	.stabstr 0 : { *(.stabstr) }
+
 	/* DWARF debug sections.
 		Symbols in the DWARF debugging sections are relative to the beginning
 		of the section so we begin them at 0.  */
@@ -61,7 +120,4 @@ SECTIONS
 	.debug_typenames 0 : { *(.debug_typenames) }
 	.debug_varnames  0 : { *(.debug_varnames) }
 	/* These must appear regardless of  .  */
-
-	/* Strip unnecessary stuff */
-/*	/DISCARD/ : { *(.comment .note .eh_frame .dtors .stab .stabstr .debug*) }*/
 }