ARM: define bootloader stack in linker script

This removes the need for the whole HAIKU_BOARD_LOADER_STACK_BASE
sing and dance, since it is always included in the bootloader binary
itself.

build/jam/board/beagle/BoardSetup

@@ -20,8 +20,6 @@ HAIKU_BOARD_LOADER_FAKE_OS = netbsd ;
 # (must be different than real load address)
 HAIKU_BOARD_LOADER_UIBASE = 0x82800000 ;
 
-HAIKU_BOARD_LOADER_STACK_BASE = 0x81a00000 ;
-
 #
 # Flash image
 #
@@ -64,7 +62,6 @@ HAIKU_BOARD_SDIMAGE_FILES =
 # gcc flags for the specific cpu
 
 local flags = -mcpu=cortex-a8 -mfpu=vfpv3 -mfloat-abi=hard
-	   -DHAIKU_BOARD_LOADER_STACK_BASE=$(HAIKU_BOARD_LOADER_STACK_BASE)
 	   -DHAIKU_BOARD_LOADER_UIBASE=$(HAIKU_BOARD_LOADER_UIBASE) ;
 
 HAIKU_ASFLAGS_$(HAIKU_PACKAGING_ARCH) += $(flags) ;

build/jam/board/neo_freerunner/BoardSetup

@@ -19,8 +19,6 @@ HAIKU_BOARD_LOADER_FAKE_OS = netbsd ;
 # (must be different than real load address)
 HAIKU_BOARD_LOADER_UIBASE = 0x34000000 ;
 
-HAIKU_BOARD_LOADER_STACK_BASE = 0x34000000 ;
-
 #
 # Flash image
 #

build/jam/board/overo/BoardSetup

@@ -20,9 +20,6 @@ HAIKU_BOARD_LOADER_FAKE_OS = netbsd ;
 # (must be different than real load address)
 HAIKU_BOARD_LOADER_UIBASE = 0x84000000 ;
 
-HAIKU_BOARD_LOADER_STACK_BASE = 0x84000000 ;
-
-
 #
 # mmc/SD image
 #

build/jam/board/sam460ex/BoardSetup

@@ -24,8 +24,6 @@ HAIKU_BOARD_LOADER_FAKE_OS = linux ;
 # (must be different than real load address)
 HAIKU_BOARD_LOADER_UIBASE = 0x02000000 ;
 
-HAIKU_BOARD_LOADER_STACK_BASE = 0x02000000 ;
-
 #
 # gcc flags for the specific cpu
 #

build/jam/board/verdex/BoardSetup

@@ -19,8 +19,6 @@ HAIKU_BOARD_LOADER_FAKE_OS = netbsd ;
 # (must be different than real load address)
 HAIKU_BOARD_LOADER_UIBASE = 0xa4000000 ;
 
-HAIKU_BOARD_LOADER_STACK_BASE = 0xa4000000 ;
-
 #
 # Flash image
 #

src/system/boot/arch/arm/arch_mmu.cpp

@@ -110,12 +110,6 @@ static struct memblock LOADER_MEMORYMAP[] = {
 		kLoaderBaseAddress + 0x11FFFFF,
 		ARM_MMU_L2_FLAG_C,
 	},
-	{
-		"RAM_stack", // stack
-		HAIKU_BOARD_LOADER_STACK_BASE,
-		HAIKU_BOARD_LOADER_STACK_BASE + 0xe00000,
-		ARM_MMU_L2_FLAG_C,
-	},
 	{
 		"RAM_initrd", // initrd
 		HAIKU_BOARD_LOADER_UIBASE,

src/system/boot/platform/u-boot/arch/arm/shell.S

@@ -2,8 +2,6 @@
 
 #include <asm_defs.h>
 
-#include <board_config.h>
-
 	.text
 
 /*
@@ -59,10 +57,7 @@ SYMBOL(_start_common):
 	mov	r4, r4
 	mov	r4, r4
 
-
-
-
-	ldr	sp,=SDRAM_BASE + KSTACK_TOP
+	ldr	sp,=__stack_top
 	ldrb	r4,gUBootOS
 	cmp	r4,#0
 	beq	start_raw
@@ -75,6 +70,7 @@ SYMBOL_END(_start_common)
 //XXX: doesn't seem to work
 //.data
 
+.global __stack_end, __stack_start
 
 SYMBOL(gUBootGlobalData):
 	.long   0

src/system/boot/platform/u-boot/start.cpp

@@ -50,7 +50,7 @@ typedef struct uboot_gd {
 // GCC defined globals
 extern void (*__ctor_list)(void);
 extern void (*__ctor_end)(void);
-extern uint8 __bss_start;
+extern uint8 __bss_start, __bss_end;
 extern uint8 _end;
 
 extern "C" int main(stage2_args *args);
@@ -72,7 +72,7 @@ static uint32 sBootOptions;
 static void
 clear_bss(void)
 {
-	memset(&__bss_start, 0, &_end - &__bss_start);
+	memset(&__bss_start, 0, &__bss_end - &__bss_start);
 }
 
 

src/system/ldscripts/arm/boot_loader_u-boot.ld

@@ -1,6 +1,8 @@
 OUTPUT_FORMAT("elf32-littlearm", "elf32-littlearm", "elf32-littlearm")
 OUTPUT_ARCH(arm)
 
+STACK_SIZE = 16384;
+
 ENTRY(_start)
 SECTIONS
 {
@@ -29,6 +31,14 @@ SECTIONS
 	/* uninitialized data (in same segment as writable data) */
 	__bss_start = .;
 	.bss : { *(.bss) }
+	__bss_end = .;
+
+	.stack : {
+		__stack_start = .;
+		. += STACK_SIZE;
+		. = ALIGN(0x8);
+		__stack_top = .;
+	}
 
 	. = ALIGN(0x1000);
 	_end = . ;