2006-05-02 Paul Brook <paul@codesourcery.com>

bfd/
	* elf32-arm.c (elf32_arm_final_link_relocate): Set thumb funciton bit
	for R_ARM_REL32.
gas/
	* config/tc-arm.c (arm_optimize_expr): New function.
	* config/tc-arm.h (md_optimize_expr): Define
	(arm_optimize_expr): Add prototype.
	(TC_FORCE_RELOCATION_SUB_SAME): Define.
ld/testsuite/
	* ld-arm/arm-elf.exp: Add thumb-rel32.
	* ld-arm/thumb-rel32.d: New test.
	* ld-arm/thumb-rel32.s: New test.

bfd/ChangeLog

@@ -1,3 +1,8 @@
+2006-05-02  Paul Brook  <paul@codesourcery.com>
+
+	* elf32-arm.c (elf32_arm_final_link_relocate): Set thumb funciton bit
+	for R_ARM_REL32.
+
 2006-05-02  Ben Elliston  <bje@au.ibm.com>
 
 	* archive.c (bfd_generic_archive_p): Remove unused local variable

bfd/elf32-arm.c

@@ -3274,9 +3274,11 @@ elf32_arm_final_link_relocate (reloc_howto_type *           howto,
 	  break;
 
 	case R_ARM_REL32:
+	  value += addend;
+	  if (sym_flags == STT_ARM_TFUNC)
+	    value |= 1;
 	  value -= (input_section->output_section->vma
 		    + input_section->output_offset + rel->r_offset);
-	  value += addend;
 	  break;
 
 	case R_ARM_PREL31:

gas/ChangeLog

@@ -1,3 +1,10 @@
+2006-05-02  Paul Brook  <paul@codesourcery.com>
+
+	* config/tc-arm.c (arm_optimize_expr): New function.
+	* config/tc-arm.h (md_optimize_expr): Define
+	(arm_optimize_expr): Add prototype.
+	(TC_FORCE_RELOCATION_SUB_SAME): Define.
+
 2006-05-02  Ben Elliston  <bje@au.ibm.com>
 
 	* config/obj-elf.h (ELF_TARGET_SYMBOL_FIELDS): Make single bit

gas/config/tc-arm.c

@@ -15811,6 +15811,29 @@ get_thumb32_insn (char * buf)
   return insn;
 }
 
+
+/* We usually want to set the low bit on the address of thumb function
+   symbols.  In particular .word foo - . should have the low bit set.
+   Generic code tries to fold the difference of two symbols to
+   a constant.  Prevent this and force a relocation when the first symbols
+   is a thumb function.  */
+int
+arm_optimize_expr (expressionS *l, operatorT op, expressionS *r)
+{
+  if (op == O_subtract
+      && l->X_op == O_symbol
+      && r->X_op == O_symbol
+      && THUMB_IS_FUNC (l->X_add_symbol))
+    {
+      l->X_op = O_subtract;
+      l->X_op_symbol = r->X_add_symbol;
+      l->X_add_number -= r->X_add_number;
+      return 1;
+    }
+  /* Process as normal.  */
+  return 0;
+}
+
 void
 md_apply_fix (fixS *	fixP,
 	       valueT * valP,

gas/config/tc-arm.h

@@ -83,6 +83,9 @@ struct fix;
   arm_relax_frag(segment, fragp, stretch)
 extern int arm_relax_frag (asection *, struct frag *, long);
 
+#define md_optimize_expr(l,o,r)		arm_optimize_expr (l, o, r)
+extern int arm_optimize_expr (expressionS *, operatorT, expressionS *);
+
 #define md_cleanup() arm_cleanup ()
 
 #define md_start_line_hook() arm_start_line_hook ()
@@ -148,6 +151,12 @@ extern void arm_md_end (void);
    || (FIX)->fx_r_type == BFD_RELOC_32			\
    || TC_FORCE_RELOCATION (FIX))
 
+/* Force output of R_ARM_REL32 relocations against thumb function symbols.
+   This is needed to ensure the low bit is handled correctly.  */
+#define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEG)	\
+  (THUMB_IS_FUNC ((FIX)->fx_addsy)		\
+   || !SEG_NORMAL (SEG))
+
 #define TC_CONS_FIX_NEW cons_fix_new_arm
 
 #define MAX_MEM_FOR_RS_ALIGN_CODE 31

ld/testsuite/ChangeLog

@@ -1,3 +1,9 @@
+2006-05-02  Paul Brook  <paul@codesourcery.com>
+
+	* ld-arm/arm-elf.exp: Add thumb-rel32.
+	* ld-arm/thumb-rel32.d: New test.
+	* ld-arm/thumb-rel32.s: New test.
+
 2006-04-29  H.J. Lu  <hongjiu.lu@intel.com>
 
 	* ld-elfvers/vers.exp: Xfail vers7a, vers7, vers23a, vers23b,

ld/testsuite/ld-arm/arm-elf.exp

@@ -119,6 +119,9 @@ set armelftests {
     {"Thumb entry point" "-T arm.ld" "" {thumb-entry.s}
      {{readelf -h thumb-entry.d}}
      "thumb-entry"}
+    {"thumb-rel32" "-static -T arm.ld" "" {thumb-rel32.s}
+     {{objdump -s thumb-rel32.d}}
+     "thumb-rel32"}
 }
 
 run_ld_link_tests $armelftests

ld/testsuite/ld-arm/thumb-rel32.d

@@ -0,0 +1,7 @@
+
+.*:     file format.*
+
+Contents of section .text:
+ 8000 (00000011 fffffffd 00ffffff f8000000|11000000 fdffffff 00f8ffff ff000000) .*
+# Ignore .ARM.attributes section
+#...

ld/testsuite/ld-arm/thumb-rel32.s

@@ -0,0 +1,18 @@
+	.text
+	.arch armv4t
+	.global	_start
+	.type	_start, %function
+	.thumb_func
+_start:
+	.word bar - .
+	.word _start - .
+	.byte 0
+	.4byte (_start - .) + 1
+	.byte 0, 0, 0
+	.section .after, "ax", %progbits
+	.global bar
+	.type bar, %function
+	.thumb_func
+bar:
+	.word 0
+	.ident	"GCC: (GNU) 4.1.0 (CodeSourcery ARM)"