allow to build arm flat binaries

Add patchset from ptxdist which is required to produce working
ARM flat binaries. Tested with busybox on Kinetis K70.

Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
Tested-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Greg Ungerer <gerg@uclinux.org>

elf2flt.c

@@ -56,6 +56,8 @@ const char *elf2flt_progname;
 
 #if defined(TARGET_h8300)
 #include <elf/h8.h>      /* TARGET_* ELF support for the BFD library            */
+#elif defined(TARGET_arm)
+#include <elf/arm.h>
 #elif defined(__CYGWIN__) || defined(__MINGW32__) || defined(TARGET_nios) || defined(TARGET_nios2)
 #include "cygwin-elf.h"	/* Cygwin uses a local copy */
 #elif defined(TARGET_xtensa)
@@ -451,7 +453,7 @@ dump_symbols(symbols, number_of_symbols);
 		qsort (relpp, relcount, sizeof *relpp, compare_relocs);
 #endif
 		for (p = relpp; (relcount && (*p != NULL)); p++, relcount--) {
-			unsigned char *r_mem;
+			unsigned char *r_mem = NULL;
 			int relocation_needed = 0;
 
 #ifdef TARGET_microblaze
@@ -646,16 +648,23 @@ dump_symbols(symbols, number_of_symbols);
 				default:
 					goto good_32bit_resolved_reloc;
 #elif defined(TARGET_arm)
+				case R_ARM_TARGET1:
+				case R_ARM_TARGET2:
 				case R_ARM_ABS32:
 					relocation_needed = 1;
 					break;
 				case R_ARM_REL32:
+				case R_ARM_JUMP24:
+				case R_ARM_CALL:
 				case R_ARM_THM_PC11:
 				case R_ARM_THM_PC22:
+				case R_ARM_THM_JUMP24:
 				case R_ARM_PC24:
 				case R_ARM_PLT32:
 				case R_ARM_GOTPC:
 				case R_ARM_GOT32:
+				case R_ARM_PREL31:
+				case R_ARM_NONE:
 					relocation_needed = 0;
 					break;
 				default:

elf2flt.ld.in

@@ -35,6 +35,8 @@ W_RODAT		*(.rodata1)
 W_RODAT		*(.rodata.*)
 W_RODAT		*(.gnu.linkonce.r*)
 
+		/* .ARM.extab name sections containing exception unwinding information */
+		*(.ARM.extab* .gnu.linkonce.armextab.*)
 		/* This is special code area at the end of the normal
 		   text section.  It contains a small lookup table at
 		   the start followed by the code pointed to by entries
@@ -43,11 +45,20 @@ W_RODAT		*(.gnu.linkonce.r*)
 		PROVIDE(@SYMBOL_PREFIX@__ctbp = .);
 		*(.call_table_data)
 		*(.call_table_text)
-
-		. = ALIGN(0x20) ;
-		@SYMBOL_PREFIX@_etext = . ;
 	} > flatmem :text
 
+	/* .ARM.exidx name sections containing index entries for section unwinding */
+	/* .ARM.exidx is sorted, so has to go in its own output section.  */
+	@SYMBOL_PREFIX@__exidx_start = .;
+	.ARM.exidx :
+	{
+		*(.ARM.exidx* .gnu.linkonce.armexidx.*)
+	} > flatmem
+	@SYMBOL_PREFIX@__exidx_end = .;
+
+	. = ALIGN(0x20) ;
+	@SYMBOL_PREFIX@_etext = . ;
+
 	.data : {
 		. = ALIGN(0x4) ;
 		@SYMBOL_PREFIX@_sdata = . ;