From 1b2c8936326aa0f31912da76dff96a24102a2711 Mon Sep 17 00:00:00 2001
From: "henryk@ploetzli.ch"
 <henryk@ploetzli.ch@ef4ab9da-24cd-11de-8aaa-f3a34680c41f>
Date: Tue, 8 Sep 2009 15:40:22 +0000
Subject: [PATCH] Fix data segement. You may now use stuff like int foo = 1; in
 global context (as opposed to both int foo = 0; which is bss and const int
 foo = 1; which is rodata) without having the sky come crashing down

---
 armsrc/appmain.c |  3 +--
 armsrc/apps.h    |  2 +-
 armsrc/ldscript  | 23 +++++++++++++++++------
 armsrc/start.c   | 15 +++++++++++++++
 4 files changed, 34 insertions(+), 9 deletions(-)

diff --git a/armsrc/appmain.c b/armsrc/appmain.c
index 9a692128..23046b4d 100644
--- a/armsrc/appmain.c
+++ b/armsrc/appmain.c
@@ -692,9 +692,8 @@ void UsbPacketReceived(BYTE *packet, int len)
 	}
 }
 
-void AppMain(void)
+void  __attribute__((noreturn)) AppMain(void)
 {
-	memset(BigBuf,0,sizeof(BigBuf));
 	SpinDelay(100);
 	
 	if(common_area.magic != COMMON_AREA_MAGIC || common_area.version != 1) {
diff --git a/armsrc/apps.h b/armsrc/apps.h
index f07504d2..1cb971bd 100644
--- a/armsrc/apps.h
+++ b/armsrc/apps.h
@@ -13,7 +13,7 @@ DWORD BigBuf[12000];
 
 /// appmain.h
 void ReadMem(int addr);
-void AppMain(void);
+void __attribute__((noreturn)) AppMain(void);
 void SamyRun(void);
 void DbpIntegers(int a, int b, int c);
 void DbpString(char *str);
diff --git a/armsrc/ldscript b/armsrc/ldscript
index 8e3231c0..cc5ce4e0 100644
--- a/armsrc/ldscript
+++ b/armsrc/ldscript
@@ -13,15 +13,26 @@ SECTIONS
 		*(.eh_frame)
 		*(.glue_7)
 		*(.glue_7t)
-		*(.version_information)
-	} >osimage
-	.rodata : { 
 		*(.rodata) 
 		*(.rodata*) 
+		*(.version_information)
 	} >osimage
-	.data : { *(.data) } >ram
-	__bss_start__ = .;
-	.bss : { *(.bss) } >ram
+	__end_of_text__ = .;
+	
+	.data : {
+		__data_start__ = .;
+		__data_src_start__ = __end_of_text__; 
+		*(.data)
+		*(.data.*)
+		__data_end__ = .;
+	} >ram AT>osimage
+	
+	.bss : {
+		__bss_start__ = .; 
+		*(.bss)
+		*(.bss.*) 
+	} >ram
+	. = ALIGN(32 / 8);
 	__bss_end__ = .;
 
     	.commonarea (NOLOAD) : {
diff --git a/armsrc/start.c b/armsrc/start.c
index de2dd2f6..0466a92f 100644
--- a/armsrc/start.c
+++ b/armsrc/start.c
@@ -6,7 +6,22 @@
 #include <proxmark3.h>
 #include "apps.h"
 
+extern char __data_start__, __data_src_start__,  __data_end__, __bss_start__, __bss_end__;
 void __attribute__((section(".startos"))) Vector(void)
 {
+	/* Stack should have been set up by the bootloader */
+	char *src, *dst, *end;
+	
+	/* Set up (that is: clear) BSS. */
+	dst = &__bss_start__;
+	end = &__bss_end__;
+	while(dst < end) *dst++ = 0;
+	
+	/* Set up data segment: Copy from flash to ram */
+	src = &__data_src_start__;
+	dst = &__data_start__;
+	end = &__data_end__;
+	while(dst < end) *dst++ = *src++;
+	
 	AppMain();
 }
-- 
2.39.2