Add support for R_ARM_XPC25 and R_ARM_THM_XPC22 relocs

bfd/bfd-in2.h

@@ -2049,6 +2049,16 @@ It generally does map to one of the other relocation types. */
 not stored in the instruction. */
   BFD_RELOC_ARM_PCREL_BRANCH,
 
+/* ARM 26 bit pc-relative branch.  The lowest bit must be zero and is
+not stored in the instruction.  The 2nd lowest bit comes from a 1 bit
+field in the instruction. */
+  BFD_RELOC_ARM_PCREL_BLX,
+
+/* Thumb 22 bit pc-relative branch.  The lowest bit must be zero and is
+not stored in the instruction.  The 2nd lowest bit comes from a 1 bit
+field in the instruction. */
+  BFD_RELOC_THUMB_PCREL_BLX,
+
 /* These relocs are only used within the ARM assembler.  They are not
 (at present) written to any object files. */
   BFD_RELOC_ARM_IMMEDIATE,
@@ -2305,7 +2315,6 @@ significant 7 bits of a 23-bit extended address are placed into
 the opcode. */
   BFD_RELOC_TIC54X_MS7_OF_23,
 
-
 /* This is a 48 bit reloc for the FR30 that stores 32 bits. */
   BFD_RELOC_FR30_48,
 

bfd/elf32-arm.h

@@ -775,10 +775,10 @@ error_return:
    moves the computed address into the PC, so it must be the second one
    in the sequence.  The problem, however is that whilst little endian code
    stores the instructions in HI then LOW order, big endian code does the
-   reverse.  nickc@cygnus.com  */
+   reverse.  nickc@cygnus.com.  */
 
-#define LOW_HI_ORDER 0xF800F000
+#define LOW_HI_ORDER      0xF800F000
-#define HI_LOW_ORDER 0xF000F800
+#define HI_LOW_ORDER      0xF000F800
 
 static insn32
 insert_thumb_branch (br_insn, rel_off)
@@ -791,9 +791,9 @@ insert_thumb_branch (br_insn, rel_off)
 
   BFD_ASSERT ((rel_off & 1) != 1);
 
-  rel_off >>= 1;		/* half word aligned address */
+  rel_off >>= 1;				/* Half word aligned address.  */
-  low_bits = rel_off & 0x000007FF;	/* the bottom 11 bits */
+  low_bits = rel_off & 0x000007FF;		/* The bottom 11 bits.  */
-  high_bits = (rel_off >> 11) & 0x000007FF;	/* the top 11 bits */
+  high_bits = (rel_off >> 11) & 0x000007FF;	/* The top 11 bits.  */
 
   if ((br_insn & LOW_HI_ORDER) == LOW_HI_ORDER)
     br_insn = LOW_HI_ORDER | (low_bits << 16) | high_bits;
@@ -803,7 +803,7 @@ insert_thumb_branch (br_insn, rel_off)
     abort ();			/* error - not a valid branch instruction form */
 
   /* FIXME: abort is probably not the right call. krk@cygnus.com */
-
+  
   return br_insn;
 }
 
@@ -1062,6 +1062,9 @@ elf32_arm_final_link_relocate (howto, input_bfd, output_bfd,
     case R_ARM_PC24:
     case R_ARM_ABS32:
     case R_ARM_REL32:
+#ifndef OLD_ARM_ABI
+    case R_ARM_XPC25:
+#endif
       /* When generating a shared object, these relocations are copied
 	 into the output file to be resolved at run time. */
 
@@ -1171,16 +1174,33 @@ elf32_arm_final_link_relocate (howto, input_bfd, output_bfd,
 	}
       else switch (r_type)
 	{
-	case R_ARM_PC24:
+#ifndef OLD_ARM_ABI
-	  /* Arm B/BL instruction */
+	case R_ARM_XPC25:	  /* Arm BLX instruction.  */
-
+#endif
-	  /* Check for arm calling thumb function.  */
+	case R_ARM_PC24:	  /* Arm B/BL instruction */
-	  if (sym_flags == STT_ARM_TFUNC)
+#ifndef OLD_ARM_ABI
+	  if (r_type == R_ARM_XPC25)
 	    {
-	      elf32_arm_to_thumb_stub (info, sym_name, input_bfd, output_bfd,
+	      /* Check for Arm calling Arm function.  */
-				       input_section, hit_data, sym_sec, rel->r_offset,
+	      /* FIXME: Should we translate the instruction into a BL
-				       signed_addend, value);
+		 instruction instead ?  */
-	      return bfd_reloc_ok;
+	      if (sym_flags != STT_ARM_TFUNC)
+		_bfd_error_handler (_("\
+%s: Warning: Arm BLX instruction targets Arm function '%s'."),
+				    bfd_get_filename (input_bfd),
+				    h->root.root.string);
+	    }
+	  else
+#endif
+	    {
+	      /* Check for Arm calling Thumb function.  */
+	      if (sym_flags == STT_ARM_TFUNC)
+		{
+		  elf32_arm_to_thumb_stub (info, sym_name, input_bfd, output_bfd,
+					   input_section, hit_data, sym_sec, rel->r_offset,
+					   signed_addend, value);
+		  return bfd_reloc_ok;
+		}
 	    }
 
 	  if (   strcmp (bfd_get_target (input_bfd), "elf32-littlearm-oabi") == 0
@@ -1321,8 +1341,11 @@ elf32_arm_final_link_relocate (howto, input_bfd, output_bfd,
       bfd_put_16 (input_bfd, value, hit_data);
       return bfd_reloc_ok;
 
+#ifndef OLD_ARM_ABI
+    case R_ARM_THM_XPC22:
+#endif
     case R_ARM_THM_PC22:
-      /* Thumb BL (branch long instruction). */
+      /* Thumb BL (branch long instruction).  */
       {
 	bfd_vma        relocation;
 	boolean        overflow = false;
@@ -1344,18 +1367,33 @@ elf32_arm_final_link_relocate (howto, input_bfd, output_bfd,
 	  signed_addend = addend;
 	}
 #endif
-
+#ifndef OLD_ARM_ABI
-        /* If it is not a call to thumb, assume call to arm.
+	if (r_type == R_ARM_THM_XPC22)
-	   If it is a call relative to a section name, then it is not a
-	   function call at all, but rather a long jump.  */
-	if (sym_flags != STT_ARM_TFUNC && sym_flags != STT_SECTION)
 	  {
-	    if (elf32_thumb_to_arm_stub
+	    /* Check for Thumb to Thumb call.  */
-		(info, sym_name, input_bfd, output_bfd, input_section,
+	    /* FIXME: Should we translate the instruction into a BL
-		 hit_data, sym_sec, rel->r_offset, signed_addend, value))
+	       instruction instead ?  */
-	      return bfd_reloc_ok;
+	    if (sym_flags == STT_ARM_TFUNC)
-	    else
+	      _bfd_error_handler (_("\
-	      return bfd_reloc_dangerous;
+%s: Warning: Thumb BLX instruction targets thumb function '%s'."),
+				  bfd_get_filename (input_bfd),
+				  h->root.root.string);
+	  }
+	else
+#endif
+	  {
+	    /* If it is not a call to Thumb, assume call to Arm.
+	       If it is a call relative to a section name, then it is not a
+	       function call at all, but rather a long jump.  */
+	    if (sym_flags != STT_ARM_TFUNC && sym_flags != STT_SECTION)
+	      {
+		if (elf32_thumb_to_arm_stub
+		    (info, sym_name, input_bfd, output_bfd, input_section,
+		     hit_data, sym_sec, rel->r_offset, signed_addend, value))
+		  return bfd_reloc_ok;
+		else
+		  return bfd_reloc_dangerous;
+	      }
 	  }
 
 	relocation = value + signed_addend;

bfd/elfarm-nabi.c

@@ -43,6 +43,10 @@
 static reloc_howto_type * elf32_arm_reloc_type_lookup
   PARAMS ((bfd * abfd, bfd_reloc_code_real_type code));
 
+/* Note: code such as elf32_arm_reloc_type_lookup expect to use e.g.
+   R_ARM_PC24 as an index into this, and find the R_ARM_PC24 HOWTO 
+   in that slot. */
+
 static reloc_howto_type elf32_arm_howto_table[] =
 {
   /* No relocation */
@@ -262,35 +266,35 @@ static reloc_howto_type elf32_arm_howto_table[] =
 	 0x00000000,		/* dst_mask */
 	 false),		/* pcrel_offset */
 
-  /* These next two relocs are defined, but I do not know what they do.  */
+  /* BLX instruction for the ARM.  */
-  
   HOWTO (R_ARM_XPC25,		/* type */
-	 0,			/* rightshift */
+	 2,			/* rightshift */
-	 0,			/* size (0 = byte, 1 = short, 2 = long) */
+	 2,			/* size (0 = byte, 1 = short, 2 = long) */
-	 0,			/* bitsize */
+	 25,			/* bitsize */
-	 false,			/* pc_relative */
+	 true,			/* pc_relative */
 	 0,			/* bitpos */
 	 complain_overflow_signed,/* complain_on_overflow */
 	 bfd_elf_generic_reloc,	/* special_function */
 	 "R_ARM_XPC25",		/* name */
 	 false,			/* partial_inplace */
-	 0x00000000,		/* src_mask */
+	 0x00ffffff,		/* src_mask */
-	 0x00000000,		/* dst_mask */
+	 0x00ffffff,		/* dst_mask */
-	 false),		/* pcrel_offset */
+	 true),			/* pcrel_offset */
-
+  
+  /* BLX instruction for the Thumb.  */
   HOWTO (R_ARM_THM_XPC22,	/* type */
-	 0,			/* rightshift */
+	 2,			/* rightshift */
-	 0,			/* size (0 = byte, 1 = short, 2 = long) */
+	 2,			/* size (0 = byte, 1 = short, 2 = long) */
-	 0,			/* bitsize */
+	 22,			/* bitsize */
-	 false,			/* pc_relative */
+	 true,			/* pc_relative */
 	 0,			/* bitpos */
 	 complain_overflow_signed,/* complain_on_overflow */
 	 bfd_elf_generic_reloc,	/* special_function */
 	 "R_ARM_THM_XPC22",	/* name */
 	 false,			/* partial_inplace */
-	 0x00000000,		/* src_mask */
+	 0x07ff07ff,		/* src_mask */
-	 0x00000000,		/* dst_mask */
+	 0x07ff07ff,		/* dst_mask */
-	 false),		/* pcrel_offset */
+	 true),			/* pcrel_offset */
   
   /* These next three relocs are not defined, but we need to fill the space.  */
 
@@ -622,6 +626,8 @@ static const struct elf32_arm_reloc_map elf32_arm_reloc_map[] =
 {
   {BFD_RELOC_NONE,                 R_ARM_NONE},
   {BFD_RELOC_ARM_PCREL_BRANCH,     R_ARM_PC24},
+  {BFD_RELOC_ARM_PCREL_BLX,        R_ARM_XPC25},
+  {BFD_RELOC_THUMB_PCREL_BLX,      R_ARM_THM_XPC22},
   {BFD_RELOC_32,                   R_ARM_ABS32},
   {BFD_RELOC_32_PCREL,             R_ARM_REL32},
   {BFD_RELOC_8,                    R_ARM_ABS8},

bfd/elfarm-oabi.c

@@ -1,5 +1,5 @@
 /* 32-bit ELF support for ARM old abi option.
-   Copyright 1999 Free Software Foundation, Inc.
+   Copyright 1999, 2000 Free Software Foundation, Inc.
 
    This file is part of BFD, the Binary File Descriptor library.
 
@@ -17,7 +17,9 @@
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
 
-#include "elf/arm-oabi.h"
+#define OLD_ARM_ABI
+
+#include "elf/arm.h"
 #include "bfd.h"
 #include "sysdep.h"
 #include "libbfd.h"

bfd/libbfd.h

@@ -765,6 +765,8 @@ static const char *const bfd_reloc_code_real_names[] = { "@@uninitialized@@",
   "BFD_RELOC_I370_D12",
   "BFD_RELOC_CTOR",
   "BFD_RELOC_ARM_PCREL_BRANCH",
+  "BFD_RELOC_ARM_PCREL_BLX",
+  "BFD_RELOC_THUMB_PCREL_BLX",
   "BFD_RELOC_ARM_IMMEDIATE",
   "BFD_RELOC_ARM_ADRL_IMMEDIATE",
   "BFD_RELOC_ARM_OFFSET_IMM",

bfd/reloc.c

@@ -25,7 +25,7 @@ SECTION
 
 	BFD maintains relocations in much the same way it maintains
 	symbols: they are left alone until required, then read in
-	en-masse and translated into an internal form.  A common
+	en-mass and translated into an internal form.  A common
 	routine <<bfd_perform_relocation>> acts upon the
 	canonical form to do the fixup.
 
@@ -2201,6 +2201,18 @@ ENUM
 ENUMDOC
   ARM 26 bit pc-relative branch.  The lowest two bits must be zero and are
   not stored in the instruction.
+ENUM
+  BFD_RELOC_ARM_PCREL_BLX
+ENUMDOC
+  ARM 26 bit pc-relative branch.  The lowest bit must be zero and is
+  not stored in the instruction.  The 2nd lowest bit comes from a 1 bit
+  field in the instruction.
+ENUM
+  BFD_RELOC_THUMB_PCREL_BLX
+ENUMDOC
+  Thumb 22 bit pc-relative branch.  The lowest bit must be zero and is
+  not stored in the instruction.  The 2nd lowest bit comes from a 1 bit
+  field in the instruction.
 ENUM
   BFD_RELOC_ARM_IMMEDIATE
 ENUMX
@@ -2539,7 +2551,6 @@ ENUMDOC
   significant 8 bits of a 24 bit word are placed into the least
   significant 8 bits of the opcode.
 
-COMMENT
 ENUM
   BFD_RELOC_TIC54X_PARTLS7
 ENUMDOC
@@ -2572,7 +2583,6 @@ ENUMDOC
   This is a reloc for the tms320c54x, where the most
   significant 7 bits of a 23-bit extended address are placed into 
   the opcode.
-COMMENT
 
 ENUM
   BFD_RELOC_FR30_48