Apply Dmitry Diky's patches to add relaxation to msp430.

1 files changed, 569 insertions, 98 deletions

diff --git a/bfd/elf32-msp430.c b/bfd/elf32-msp430.c
index dfe33bd246f..ba59cf7f874 100644
--- a/bfd/elf32-msp430.c
+++ b/bfd/elf32-msp430.c
@@ -25,41 +25,6 @@
 #include "elf-bfd.h"
 #include "elf/msp430.h"
 
-static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
-  PARAMS ((bfd *, bfd_reloc_code_real_type));
-
-static void msp430_info_to_howto_rela
-  PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
-
-static asection *elf32_msp430_gc_mark_hook
-  PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *,
-	   struct elf_link_hash_entry *, Elf_Internal_Sym *));
-
-static bfd_boolean elf32_msp430_gc_sweep_hook
-  PARAMS ((bfd *, struct bfd_link_info *, asection *,
-	   const Elf_Internal_Rela *));
-
-static bfd_boolean elf32_msp430_check_relocs
-  PARAMS ((bfd *, struct bfd_link_info *, asection *,
-	   const Elf_Internal_Rela *));
-
-static bfd_reloc_status_type msp430_final_link_relocate
-  PARAMS ((reloc_howto_type *, bfd *, asection *, bfd_byte *,
-	   Elf_Internal_Rela *, bfd_vma));
-
-static bfd_boolean elf32_msp430_relocate_section
-  PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
-	   Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
-
-static void bfd_elf_msp430_final_write_processing
-  PARAMS ((bfd *, bfd_boolean));
-
-static bfd_boolean elf32_msp430_object_p
-  PARAMS ((bfd *));
-
-static void elf32_msp430_post_process_headers
-  PARAMS ((bfd *, struct bfd_link_info *));
-
 /* Use RELA instead of REL.  */
 #undef USE_REL
 
@@ -71,7 +36,7 @@ static reloc_howto_type elf_msp430_howto_table[] =
 	 32,			/* bitsize */
 	 FALSE,			/* pc_relative */
 	 0,			/* bitpos */
-	 complain_overflow_bitfield,	/* complain_on_overflow */
+	 complain_overflow_bitfield,/* complain_on_overflow */
 	 bfd_elf_generic_reloc,	/* special_function */
 	 "R_MSP430_NONE",	/* name */
 	 FALSE,			/* partial_inplace */
@@ -85,7 +50,7 @@ static reloc_howto_type elf_msp430_howto_table[] =
 	 32,			/* bitsize */
 	 FALSE,			/* pc_relative */
 	 0,			/* bitpos */
-	 complain_overflow_bitfield,	/* complain_on_overflow */
+	 complain_overflow_bitfield,/* complain_on_overflow */
 	 bfd_elf_generic_reloc,	/* special_function */
 	 "R_MSP430_32",		/* name */
 	 FALSE,			/* partial_inplace */
@@ -100,7 +65,7 @@ static reloc_howto_type elf_msp430_howto_table[] =
 	 10,			/* bitsize */
 	 TRUE,			/* pc_relative */
 	 0,			/* bitpos */
-	 complain_overflow_bitfield,	/* complain_on_overflow */
+	 complain_overflow_bitfield,/* complain_on_overflow */
 	 bfd_elf_generic_reloc,	/* special_function */
 	 "R_MSP430_13_PCREL",	/* name */
 	 FALSE,			/* partial_inplace */
@@ -119,7 +84,7 @@ static reloc_howto_type elf_msp430_howto_table[] =
 	 bfd_elf_generic_reloc,	/* special_function */
 	 "R_MSP430_16",		/* name */
 	 FALSE,			/* partial_inplace */
-	 0xffff,		/* src_mask */
+	 0,			/* src_mask */
 	 0xffff,		/* dst_mask */
 	 FALSE),		/* pcrel_offset */
 
@@ -134,7 +99,7 @@ static reloc_howto_type elf_msp430_howto_table[] =
 	 bfd_elf_generic_reloc,	/* special_function */
 	 "R_MSP430_16_PCREL",	/* name */
 	 FALSE,			/* partial_inplace */
-	 0xffff,		/* src_mask */
+	 0,			/* src_mask */
 	 0xffff,		/* dst_mask */
 	 TRUE),			/* pcrel_offset */
 
@@ -162,10 +127,40 @@ static reloc_howto_type elf_msp430_howto_table[] =
 	 0,			/* bitpos */
 	 complain_overflow_dont,/* complain_on_overflow */
 	 bfd_elf_generic_reloc,	/* special_function */
-	 "R_MSP430_16_PCREL_BYTE",	/* name */
+	 "R_MSP430_16_PCREL_BYTE",/* name */
 	 FALSE,			/* partial_inplace */
 	 0xffff,		/* src_mask */
 	 0xffff,		/* dst_mask */
+	 TRUE),			/* pcrel_offset */
+
+  /* A 13 bit PC relative relocation for complicated polymorphs.  */
+  HOWTO (R_MSP430_2X_PCREL,	/* type */
+	 1,			/* rightshift */
+	 2,			/* size (0 = byte, 1 = short, 2 = long) */
+	 10,			/* bitsize */
+	 TRUE,			/* pc_relative */
+	 0,			/* bitpos */
+	 complain_overflow_bitfield,/* complain_on_overflow */
+	 bfd_elf_generic_reloc,	/* special_function */
+	 "R_MSP430_2X_PCREL",	/* name */
+	 FALSE,			/* partial_inplace */
+	 0xfff,			/* src_mask */
+	 0xfff,			/* dst_mask */
+	 TRUE),			/* pcrel_offset */
+
+  /* A 16 bit relaxable relocation for command address.  */
+  HOWTO (R_MSP430_RL_PCREL,	/* type */
+	 1,			/* rightshift */
+	 1,			/* size (0 = byte, 1 = short, 2 = long) */
+	 16,			/* bitsize */
+	 TRUE,			/* pc_relative */
+	 0,			/* bitpos */
+	 complain_overflow_dont,/* complain_on_overflow */
+	 bfd_elf_generic_reloc,	/* special_function */
+	 "R_MSP430_RL_PCREL",	/* name */
+	 FALSE,			/* partial_inplace */
+	 0,			/* src_mask */
+	 0xffff,		/* dst_mask */
 	 TRUE)			/* pcrel_offset */
 };
 
@@ -179,20 +174,21 @@ struct msp430_reloc_map
 
 static const struct msp430_reloc_map msp430_reloc_map[] =
   {
-    {BFD_RELOC_NONE, R_MSP430_NONE},
-    {BFD_RELOC_32, R_MSP430_32},
-    {BFD_RELOC_MSP430_10_PCREL, R_MSP430_10_PCREL},
-    {BFD_RELOC_16, R_MSP430_16_BYTE},
-    {BFD_RELOC_MSP430_16_PCREL, R_MSP430_16_PCREL},
-    {BFD_RELOC_MSP430_16, R_MSP430_16},
+    {BFD_RELOC_NONE,                 R_MSP430_NONE},
+    {BFD_RELOC_32,                   R_MSP430_32},
+    {BFD_RELOC_MSP430_10_PCREL,      R_MSP430_10_PCREL},
+    {BFD_RELOC_16,                   R_MSP430_16_BYTE},
+    {BFD_RELOC_MSP430_16_PCREL,      R_MSP430_16_PCREL},
+    {BFD_RELOC_MSP430_16,            R_MSP430_16},
     {BFD_RELOC_MSP430_16_PCREL_BYTE, R_MSP430_16_PCREL_BYTE},
-    {BFD_RELOC_MSP430_16_BYTE, R_MSP430_16_BYTE}
+    {BFD_RELOC_MSP430_16_BYTE,       R_MSP430_16_BYTE},
+    {BFD_RELOC_MSP430_2X_PCREL,      R_MSP430_2X_PCREL},
+    {BFD_RELOC_MSP430_RL_PCREL,      R_MSP430_RL_PCREL}
   };
 
 static reloc_howto_type *
-bfd_elf32_bfd_reloc_type_lookup (abfd, code)
-     bfd *abfd ATTRIBUTE_UNUSED;
-     bfd_reloc_code_real_type code;
+bfd_elf32_bfd_reloc_type_lookup (bfd * abfd ATTRIBUTE_UNUSED,
+				 bfd_reloc_code_real_type code)
 {
   unsigned int i;
 
@@ -206,10 +202,9 @@ bfd_elf32_bfd_reloc_type_lookup (abfd, code)
 /* Set the howto pointer for an MSP430 ELF reloc.  */
 
 static void
-msp430_info_to_howto_rela (abfd, cache_ptr, dst)
-     bfd *abfd ATTRIBUTE_UNUSED;
-     arelent *cache_ptr;
-     Elf_Internal_Rela *dst;
+msp430_info_to_howto_rela (bfd * abfd ATTRIBUTE_UNUSED,
+			   arelent * cache_ptr,
+			   Elf_Internal_Rela * dst)
 {
   unsigned int r_type;
 
@@ -219,12 +214,11 @@ msp430_info_to_howto_rela (abfd, cache_ptr, dst)
 }
 
 static asection *
-elf32_msp430_gc_mark_hook (sec, info, rel, h, sym)
-     asection *sec;
-     struct bfd_link_info *info ATTRIBUTE_UNUSED;
-     Elf_Internal_Rela *rel;
-     struct elf_link_hash_entry *h;
-     Elf_Internal_Sym *sym;
+elf32_msp430_gc_mark_hook (asection * sec,
+			   struct bfd_link_info * info ATTRIBUTE_UNUSED,
+			   Elf_Internal_Rela * rel,
+			   struct elf_link_hash_entry * h,
+			   Elf_Internal_Sym * sym)
 {
   if (h != NULL)
     {
@@ -252,11 +246,10 @@ elf32_msp430_gc_mark_hook (sec, info, rel, h, sym)
 }
 
 static bfd_boolean
-elf32_msp430_gc_sweep_hook (abfd, info, sec, relocs)
-     bfd *abfd ATTRIBUTE_UNUSED;
-     struct bfd_link_info *info ATTRIBUTE_UNUSED;
-     asection *sec ATTRIBUTE_UNUSED;
-     const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED;
+elf32_msp430_gc_sweep_hook (bfd * abfd ATTRIBUTE_UNUSED,
+			    struct bfd_link_info * info ATTRIBUTE_UNUSED,
+			    asection * sec ATTRIBUTE_UNUSED,
+			    const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED)
 {
   /* We don't use got and plt entries for msp430.  */
   return TRUE;
@@ -267,11 +260,8 @@ elf32_msp430_gc_sweep_hook (abfd, info, sec, relocs)
    virtual table relocs for gc.  */
 
 static bfd_boolean
-elf32_msp430_check_relocs (abfd, info, sec, relocs)
-     bfd *abfd;
-     struct bfd_link_info *info;
-     asection *sec;
-     const Elf_Internal_Rela *relocs;
+elf32_msp430_check_relocs (bfd * abfd, struct bfd_link_info * info,
+			   asection * sec, const Elf_Internal_Rela * relocs)
 {
   Elf_Internal_Shdr *symtab_hdr;
   struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
@@ -308,14 +298,9 @@ elf32_msp430_check_relocs (abfd, info, sec, relocs)
    routines, but a few relocs, we have to do them ourselves.  */
 
 static bfd_reloc_status_type
-msp430_final_link_relocate (howto, input_bfd, input_section,
-			    contents, rel, relocation)
-     reloc_howto_type *howto;
-     bfd *input_bfd;
-     asection *input_section;
-     bfd_byte *contents;
-     Elf_Internal_Rela *rel;
-     bfd_vma relocation;
+msp430_final_link_relocate (reloc_howto_type * howto, bfd * input_bfd,
+			    asection * input_section, bfd_byte * contents,
+			    Elf_Internal_Rela * rel, bfd_vma relocation)
 {
   bfd_reloc_status_type r = bfd_reloc_ok;
   bfd_vma x;
@@ -347,7 +332,37 @@ msp430_final_link_relocate (howto, input_bfd, input_section,
       bfd_put_16 (input_bfd, x, contents);
       break;
 
+    case R_MSP430_2X_PCREL:
+      contents += rel->r_offset;
+      srel = (bfd_signed_vma) relocation;
+      srel += rel->r_addend;
+      srel -= rel->r_offset;
+      srel -= 2;		/* Branch instructions add 2 to the PC...  */
+      srel -= (input_section->output_section->vma +
+	       input_section->output_offset);
+
+      if (srel & 1)
+	return bfd_reloc_outofrange;
+
+      /* MSP430 addresses commands as words.  */
+      srel >>= 1;
+
+      /* Check for an overflow.  */
+      if (srel < -512 || srel > 511)
+	return bfd_reloc_overflow;
+
+      x = bfd_get_16 (input_bfd, contents);
+      x = (x & 0xfc00) | (srel & 0x3ff);
+      bfd_put_16 (input_bfd, x, contents);
+      /* Handle second jump instruction.  */
+      x = bfd_get_16 (input_bfd, contents - 2);
+      srel += 1;
+      x = (x & 0xfc00) | (srel & 0x3ff);
+      bfd_put_16 (input_bfd, x, contents - 2);
+      break;
+
     case R_MSP430_16_PCREL:
+    case R_MSP430_RL_PCREL:
       contents += rel->r_offset;
       srel = (bfd_signed_vma) relocation;
       srel += rel->r_addend;
@@ -404,16 +419,14 @@ msp430_final_link_relocate (howto, input_bfd, input_section,
 /* Relocate an MSP430 ELF section.  */
 
 static bfd_boolean
-elf32_msp430_relocate_section (output_bfd, info, input_bfd, input_section,
-			       contents, relocs, local_syms, local_sections)
-     bfd *output_bfd ATTRIBUTE_UNUSED;
-     struct bfd_link_info *info;
-     bfd *input_bfd;
-     asection *input_section;
-     bfd_byte *contents;
-     Elf_Internal_Rela *relocs;
-     Elf_Internal_Sym *local_syms;
-     asection **local_sections;
+elf32_msp430_relocate_section (bfd * output_bfd ATTRIBUTE_UNUSED,
+			       struct bfd_link_info * info,
+			       bfd * input_bfd,
+			       asection * input_section,
+			       bfd_byte * contents,
+			       Elf_Internal_Rela * relocs,
+			       Elf_Internal_Sym * local_syms,
+			       asection ** local_sections)
 {
   Elf_Internal_Shdr *symtab_hdr;
   struct elf_link_hash_entry **sym_hashes;
@@ -520,9 +533,8 @@ elf32_msp430_relocate_section (output_bfd, info, input_bfd, input_section,
    number.  */
 
 static void
-bfd_elf_msp430_final_write_processing (abfd, linker)
-     bfd *abfd;
-     bfd_boolean linker ATTRIBUTE_UNUSED;
+bfd_elf_msp430_final_write_processing (bfd * abfd,
+				       bfd_boolean linker ATTRIBUTE_UNUSED)
 {
   unsigned long val;
 
@@ -594,8 +606,7 @@ bfd_elf_msp430_final_write_processing (abfd, linker)
 /* Set the right machine number.  */
 
 static bfd_boolean
-elf32_msp430_object_p (abfd)
-     bfd *abfd;
+elf32_msp430_object_p (bfd * abfd)
 {
   int e_set = bfd_mach_msp14;
 
@@ -669,11 +680,10 @@ elf32_msp430_object_p (abfd)
 }
 
 static void
-elf32_msp430_post_process_headers (abfd, link_info)
-     bfd *abfd;
-     struct bfd_link_info *link_info ATTRIBUTE_UNUSED;
+elf32_msp430_post_process_headers (bfd * abfd,
+				   struct bfd_link_info * link_info ATTRIBUTE_UNUSED)
 {
-  Elf_Internal_Ehdr *i_ehdrp;	/* ELF file header, internal form.  */
+  Elf_Internal_Ehdr * i_ehdrp;	/* ELF file header, internal form.  */
 
   i_ehdrp = elf_elfheader (abfd);
 
@@ -684,6 +694,466 @@ elf32_msp430_post_process_headers (abfd, link_info)
   i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_STANDALONE;
 }
 
+/* These functions handle relaxing for the msp430.
+   Relaxation required only in two cases:
+    - Bad hand coding like jumps from one section to another or
+      from file to file.
+    - Sibling calls. This will affect onlu 'jump label' polymorph. Without
+      relaxing this enlarges code by 2 bytes. Sibcalls implemented but
+      do not work in gcc's port by the reason I do not know.
+   Anyway, if a relaxation required, user should pass -relax option to the
+   linker.
+
+   There are quite a few relaxing opportunities available on the msp430:
+
+   ================================================================
+
+   1. 3 words -> 1 word
+
+   eq      ==      jeq label    		jne +4; br lab
+   ne      !=      jne label    		jeq +4; br lab
+   lt      <       jl  label    		jge +4; br lab
+   ltu     <       jlo label    		lhs +4; br lab
+   ge      >=      jge label    		jl  +4; br lab
+   geu     >=      jhs label    		jlo +4; br lab
+
+   2. 4 words -> 1 word
+
+   ltn     <       jn                      jn  +2; jmp +4; br lab
+
+   3. 4 words -> 2 words
+
+   gt      >       jeq +2; jge label       jeq +6; jl  +4; br label
+   gtu     >       jeq +2; jhs label       jeq +6; jlo +4; br label
+
+   4. 4 words -> 2 words and 2 labels
+
+   leu     <=      jeq label; jlo label    jeq +2; jhs +4; br label
+   le      <=      jeq label; jl  label    jeq +2; jge +4; br label
+   =================================================================
+
+   codemap for first cases is (labels masked ):
+	      eq:	0x2002,0x4010,0x0000 -> 0x2400
+	      ne:	0x2402,0x4010,0x0000 -> 0x2000
+	      lt:	0x3402,0x4010,0x0000 -> 0x3800
+	      ltu:	0x2c02,0x4010,0x0000 -> 0x2800
+	      ge:	0x3802,0x4010,0x0000 -> 0x3400
+	      geu:	0x2802,0x4010,0x0000 -> 0x2c00
+
+  second case:
+	      ltn:	0x3001,0x3c02,0x4010,0x0000 -> 0x3000
+
+  third case:
+	      gt:	0x2403,0x3802,0x4010,0x0000 -> 0x2401,0x3400
+	      gtu:	0x2403,0x2802,0x4010,0x0000 -> 0x2401,0x2c00
+
+  fourth case:
+	      leu:	0x2401,0x2c02,0x4010,0x0000 -> 0x2400,0x2800
+	      le:	0x2401,0x3402,0x4010,0x0000 -> 0x2400,0x3800
+
+  Unspecified case :)
+	      jump:	0x4010,0x0000 -> 0x3c00.  */
+
+#define NUMB_RELAX_CODES	12
+static struct rcodes_s
+{
+  int f0, f1;			/* From code.  */
+  int t0, t1;			/* To code.  */
+  int labels;			/* Position of labels: 1 - one label at first
+				   word, 2 - one at second word, 3 - two
+				   labels at both.  */
+  int cdx;			/* Words to match.  */
+  int bs;			/* Shrink bytes.  */
+  int off;			/* Offset from old label for new code.  */
+  int ncl;			/* New code length.  */
+} rcode[] =
+{/*                               lab,cdx,bs,off,ncl */
+  { 0x0000, 0x0000, 0x3c00, 0x0000, 1, 0, 2, 2,	 2},	/* jump */
+  { 0x0000, 0x2002, 0x2400, 0x0000, 1, 1, 4, 4,	 2},	/* eq */
+  { 0x0000, 0x2402, 0x2000, 0x0000, 1, 1, 4, 4,	 2},	/* ne */
+  { 0x0000, 0x3402, 0x3800, 0x0000, 1, 1, 4, 4,	 2},	/* lt */
+  { 0x0000, 0x2c02, 0x2800, 0x0000, 1, 1, 4, 4,	 2},	/* ltu */
+  { 0x0000, 0x3802, 0x3400, 0x0000, 1, 1, 4, 4,	 2},	/* ge */
+  { 0x0000, 0x2802, 0x2c00, 0x0000, 1, 1, 4, 4,	 2},	/* geu */
+  { 0x3001, 0x3c02, 0x3000, 0x0000, 1, 2, 6, 6,	 2},	/* ltn */
+  { 0x2403, 0x3802, 0x2401, 0x3400, 2, 2, 4, 6,	 4},	/* gt */
+  { 0x2403, 0x2802, 0x2401, 0x2c00, 2, 2, 4, 6,	 4},	/* gtu */
+  { 0x2401, 0x2c02, 0x2400, 0x2800, 3, 2, 4, 6,	 4},	/* leu , 2 labels */
+  { 0x2401, 0x2c02, 0x2400, 0x2800, 3, 2, 4, 6,	 4},	/* le  , 2 labels */
+  { 0, 	    0, 	    0, 	    0, 	    0, 0, 0, 0,  0}
+};
+
+/* Return TRUE if a symbol exists at the given address.  */
+
+static bfd_boolean
+msp430_elf_symbol_address_p (bfd * abfd,
+			     asection * sec,
+			     Elf_Internal_Sym * isym,
+			     bfd_vma addr)
+{
+  Elf_Internal_Shdr *symtab_hdr;
+  unsigned int sec_shndx;
+  Elf_Internal_Sym *isymend;
+  struct elf_link_hash_entry **sym_hashes;
+  struct elf_link_hash_entry **end_hashes;
+  unsigned int symcount;
+
+  sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
+
+  /* Examine all the local symbols.  */
+  symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
+  for (isymend = isym + symtab_hdr->sh_info; isym < isymend; isym++)
+    if (isym->st_shndx == sec_shndx && isym->st_value == addr)
+      return TRUE;
+
+  symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
+	      - symtab_hdr->sh_info);
+  sym_hashes = elf_sym_hashes (abfd);
+  end_hashes = sym_hashes + symcount;
+  for (; sym_hashes < end_hashes; sym_hashes++)
+    {
+      struct elf_link_hash_entry *sym_hash = *sym_hashes;
+
+      if ((sym_hash->root.type == bfd_link_hash_defined
+	   || sym_hash->root.type == bfd_link_hash_defweak)
+	  && sym_hash->root.u.def.section == sec
+	  && sym_hash->root.u.def.value == addr)
+	return TRUE;
+    }
+
+  return FALSE;
+}
+
+/* Delete some bytes from a section while relaxing.  */
+
+static bfd_boolean
+msp430_elf_relax_delete_bytes (bfd * abfd, asection * sec, bfd_vma addr,
+			       int count)
+{
+  Elf_Internal_Shdr *symtab_hdr;
+  unsigned int sec_shndx;
+  bfd_byte *contents;
+  Elf_Internal_Rela *irel;
+  Elf_Internal_Rela *irelend;
+  Elf_Internal_Rela *irelalign;
+  bfd_vma toaddr;
+  Elf_Internal_Sym *isym;
+  Elf_Internal_Sym *isymend;
+  struct elf_link_hash_entry **sym_hashes;
+  struct elf_link_hash_entry **end_hashes;
+  unsigned int symcount;
+
+  sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
+
+  contents = elf_section_data (sec)->this_hdr.contents;
+
+  /* The deletion must stop at the next ALIGN reloc for an aligment
+     power larger than the number of bytes we are deleting.  */
+
+  irelalign = NULL;
+  toaddr = sec->size;
+
+  irel = elf_section_data (sec)->relocs;
+  irelend = irel + sec->reloc_count;
+
+  /* Actually delete the bytes.  */
+  memmove (contents + addr, contents + addr + count,
+	   (size_t) (toaddr - addr - count));
+  sec->size -= count;
+
+  /* Adjust all the relocs.  */
+  for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
+    /* Get the new reloc address.  */
+    if ((irel->r_offset > addr && irel->r_offset < toaddr))
+      irel->r_offset -= count;
+
+  /* Adjust the local symbols defined in this section.  */
+  symtab_hdr = & elf_tdata (abfd)->symtab_hdr;
+  isym = (Elf_Internal_Sym *) symtab_hdr->contents;
+  for (isymend = isym + symtab_hdr->sh_info; isym < isymend; isym++)
+    if (isym->st_shndx == sec_shndx
+	&& isym->st_value > addr && isym->st_value < toaddr)
+      isym->st_value -= count;
+
+  /* Now adjust the global symbols defined in this section.  */
+  symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
+	      - symtab_hdr->sh_info);
+  sym_hashes = elf_sym_hashes (abfd);
+  end_hashes = sym_hashes + symcount;
+  for (; sym_hashes < end_hashes; sym_hashes++)
+    {
+      struct elf_link_hash_entry *sym_hash = *sym_hashes;
+
+      if ((sym_hash->root.type == bfd_link_hash_defined
+	   || sym_hash->root.type == bfd_link_hash_defweak)
+	  && sym_hash->root.u.def.section == sec
+	  && sym_hash->root.u.def.value > addr
+	  && sym_hash->root.u.def.value < toaddr)
+	sym_hash->root.u.def.value -= count;
+    }
+
+  return TRUE;
+}
+
+
+static bfd_boolean
+msp430_elf_relax_section (bfd * abfd, asection * sec,
+			  struct bfd_link_info * link_info,
+			  bfd_boolean * again)
+{
+  Elf_Internal_Shdr * symtab_hdr;
+  Elf_Internal_Rela * internal_relocs;
+  Elf_Internal_Rela * irel;
+  Elf_Internal_Rela * irelend;
+  bfd_byte *          contents = NULL;
+  Elf_Internal_Sym *  isymbuf = NULL;
+
+  /* Assume nothing changes.  */
+  *again = FALSE;
+
+  /* We don't have to do anything for a relocatable link, if
+     this section does not have relocs, or if this is not a
+     code section.  */
+  if (link_info->relocatable
+      || (sec->flags & SEC_RELOC) == 0
+      || sec->reloc_count == 0 || (sec->flags & SEC_CODE) == 0)
+    return TRUE;
+
+  symtab_hdr = & elf_tdata (abfd)->symtab_hdr;
+
+  /* Get a copy of the native relocations.  */
+  internal_relocs =
+    _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL, link_info->keep_memory);
+  if (internal_relocs == NULL)
+    goto error_return;
+
+  /* Walk through them looking for relaxing opportunities.  */
+  irelend = internal_relocs + sec->reloc_count;
+  for (irel = internal_relocs; irel < irelend; irel++)
+    {
+      bfd_vma symval;
+
+      /* If this isn't something that can be relaxed, then ignore
+         this reloc.  */
+      if (ELF32_R_TYPE (irel->r_info) != (int) R_MSP430_RL_PCREL)
+	continue;
+
+      /* Get the section contents if we haven't done so already.  */
+      if (contents == NULL)
+	{
+	  /* Get cached copy if it exists.  */
+	  if (elf_section_data (sec)->this_hdr.contents != NULL)
+	    contents = elf_section_data (sec)->this_hdr.contents;
+	  else if (! bfd_malloc_and_get_section (abfd, sec, &contents))
+	    goto error_return;
+	}
+
+      /* Read this BFD's local symbols if we haven't done so already.  */
+      if (isymbuf == NULL && symtab_hdr->sh_info != 0)
+	{
+	  isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
+	  if (isymbuf == NULL)
+	    isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
+					    symtab_hdr->sh_info, 0,
+					    NULL, NULL, NULL);
+	  if (isymbuf == NULL)
+	    goto error_return;
+	}
+
+      /* Get the value of the symbol referred to by the reloc.  */
+      if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
+	{
+	  /* A local symbol.  */
+	  Elf_Internal_Sym *isym;
+	  asection *sym_sec;
+
+	  isym = isymbuf + ELF32_R_SYM (irel->r_info);
+	  if (isym->st_shndx == SHN_UNDEF)
+	    sym_sec = bfd_und_section_ptr;
+	  else if (isym->st_shndx == SHN_ABS)
+	    sym_sec = bfd_abs_section_ptr;
+	  else if (isym->st_shndx == SHN_COMMON)
+	    sym_sec = bfd_com_section_ptr;
+	  else
+	    sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
+	  symval = (isym->st_value
+		    + sym_sec->output_section->vma + sym_sec->output_offset);
+	}
+      else
+	{
+	  unsigned long indx;
+	  struct elf_link_hash_entry *h;
+
+	  /* An external symbol.  */
+	  indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
+	  h = elf_sym_hashes (abfd)[indx];
+	  BFD_ASSERT (h != NULL);
+
+	  if (h->root.type != bfd_link_hash_defined
+	      && h->root.type != bfd_link_hash_defweak)
+	    /* This appears to be a reference to an undefined
+	       symbol.  Just ignore it--it will be caught by the
+	       regular reloc processing.  */
+	    continue;
+
+	  symval = (h->root.u.def.value
+		    + h->root.u.def.section->output_section->vma
+		    + h->root.u.def.section->output_offset);
+	}
+
+      /* For simplicity of coding, we are going to modify the section
+         contents, the section relocs, and the BFD symbol table.  We
+         must tell the rest of the code not to free up this
+         information.  It would be possible to instead create a table
+         of changes which have to be made, as is done in coff-mips.c;
+         that would be more work, but would require less memory when
+         the linker is run.  */
+
+      /* Try to turn a 16bit pc-relative branch into a 10bit pc-relative
+         branch.  */
+      /* Paranoia? paranoia...  */      
+      if (ELF32_R_TYPE (irel->r_info) == (int) R_MSP430_RL_PCREL)
+	{
+	  bfd_vma value = symval;
+
+	  /* Deal with pc-relative gunk.  */
+	  value -= (sec->output_section->vma + sec->output_offset);
+	  value -= irel->r_offset;
+	  value += irel->r_addend;
+
+	  /* See if the value will fit in 10 bits, note the high value is
+	     1016 as the target will be two bytes closer if we are
+	     able to relax. */
+	  if ((long) value < 1016 && (long) value > -1016)
+	    {
+	      int code0 = 0, code1 = 0, code2 = 0;
+	      int i;
+	      struct rcodes_s *rx;
+
+	      /* Get the opcode.  */
+	      if (irel->r_offset >= 6)
+		code0 = bfd_get_16 (abfd, contents + irel->r_offset - 6);
+
+	      if (irel->r_offset >= 4)
+		code1 = bfd_get_16 (abfd, contents + irel->r_offset - 4);
+
+	      code2 = bfd_get_16 (abfd, contents + irel->r_offset - 2);
+
+	      if (code2 != 0x4010)
+		continue;
+
+	      /* Check r4 and r3.  */
+	      for (i = NUMB_RELAX_CODES - 1; i >= 0; i--)
+		{
+		  rx = &rcode[i];
+		  if (rx->cdx == 2 && rx->f0 == code0 && rx->f1 == code1)
+		    break;
+		  else if (rx->cdx == 1 && rx->f1 == code1)
+		    break;
+		  else if (rx->cdx == 0)	/* This is an unconditional jump.  */
+		    break;
+		}
+
+	      /* Check labels:
+		   .Label0:       ; we do not care about this label
+		      jeq    +6
+		   .Label1:       ; make sure there is no label here
+		      jl     +4
+		   .Label2:       ; make sure there is no label here
+		      br .Label_dst
+
+	         So, if there is .Label1 or .Label2 we cannot relax this code.
+	         This actually should not happen, cause for relaxable
+		 instructions we use RL_PCREL reloc instead of 16_PCREL.
+		 Will change this in the future. */
+
+	      if (rx->cdx > 0
+		  && msp430_elf_symbol_address_p (abfd, sec, isymbuf,
+						  irel->r_offset - 2))
+		continue;
+	      if (rx->cdx > 1
+		  && msp430_elf_symbol_address_p (abfd, sec, isymbuf,
+						  irel->r_offset - 4))
+		continue;
+
+	      /* Note that we've changed the relocs, section contents, etc.  */
+	      elf_section_data (sec)->relocs = internal_relocs;
+	      elf_section_data (sec)->this_hdr.contents = contents;
+	      symtab_hdr->contents = (unsigned char *) isymbuf;
+
+	      /* Fix the relocation's type.  */
+	      if (rx->labels == 3)	/* Handle special cases.  */
+		irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
+					   R_MSP430_2X_PCREL);
+	      else
+		irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
+					   R_MSP430_10_PCREL);
+
+	      /* Fix the opcode right way.  */
+	      bfd_put_16 (abfd, rx->t0, contents + irel->r_offset - rx->off);
+	      if (rx->t1)
+		bfd_put_16 (abfd, rx->t1,
+			    contents + irel->r_offset - rx->off + 2);
+
+	      /* Delete bytes. */
+	      if (!msp430_elf_relax_delete_bytes (abfd, sec,
+						  irel->r_offset - rx->off +
+						  rx->ncl, rx->bs))
+		goto error_return;
+
+	      /* Handle unconditional jumps.  */
+	      if (rx->cdx == 0)
+		irel->r_offset -= 2;
+
+	      /* That will change things, so, we should relax again.
+	         Note that this is not required, and it may be slow.  */
+	      *again = TRUE;
+	    }
+	}
+    }
+
+  if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
+    {
+      if (!link_info->keep_memory)
+	free (isymbuf);
+      else
+	{
+	  /* Cache the symbols for elf_link_input_bfd.  */
+	  symtab_hdr->contents = (unsigned char *) isymbuf;
+	}
+    }
+
+  if (contents != NULL
+      && elf_section_data (sec)->this_hdr.contents != contents)
+    {
+      if (!link_info->keep_memory)
+	free (contents);
+      else
+	{
+	  /* Cache the section contents for elf_link_input_bfd.  */
+	  elf_section_data (sec)->this_hdr.contents = contents;
+	}
+    }
+
+  if (internal_relocs != NULL
+      && elf_section_data (sec)->relocs != internal_relocs)
+    free (internal_relocs);
+
+  return TRUE;
+
+error_return:
+  if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf)
+    free (isymbuf);
+  if (contents != NULL
+      && elf_section_data (sec)->this_hdr.contents != contents)
+    free (contents);
+  if (internal_relocs != NULL
+      && elf_section_data (sec)->relocs != internal_relocs)
+    free (internal_relocs);
+
+  return FALSE;
+}
+
 
 #define ELF_ARCH		bfd_arch_msp430
 #define ELF_MACHINE_CODE	EM_MSP430
@@ -703,5 +1173,6 @@ elf32_msp430_post_process_headers (abfd, link_info)
 #define elf_backend_final_write_processing   bfd_elf_msp430_final_write_processing
 #define elf_backend_object_p		     elf32_msp430_object_p
 #define elf_backend_post_process_headers     elf32_msp430_post_process_headers
+#define bfd_elf32_bfd_relax_section	     msp430_elf_relax_section
 
 #include "elf32-target.h"