Initial revision

1 files changed, 213 insertions, 0 deletions

diff --git a/bfd/elf32-arc.c b/bfd/elf32-arc.c
new file mode 100644
index 0000000000..a490a246b0
--- /dev/null
+++ b/bfd/elf32-arc.c
@@ -0,0 +1,213 @@
+/* ARC-specific support for 32-bit ELF
+   Copyright (C) 1994, 1995, 1997 Free Software Foundation, Inc.
+   Contributed by Doug Evans (dje@cygnus.com).
+
+This file is part of BFD, the Binary File Descriptor library.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#include "bfd.h"
+#include "sysdep.h"
+#include "libbfd.h"
+#include "elf-bfd.h"
+#include "elf/arc.h"
+
+static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
+ PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
+static void arc_info_to_howto_rel
+  PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *));
+static boolean arc_elf_object_p PARAMS ((bfd *));
+static void arc_elf_final_write_processing PARAMS ((bfd *, boolean));
+
+/* Try to minimize the amount of space occupied by relocation tables
+   on the ROM (not that the ROM won't be swamped by other ELF overhead).  */
+#define USE_REL
+
+static reloc_howto_type elf_arc_howto_table[] =
+{
+  /* This reloc does nothing.  */
+  HOWTO (R_ARC_NONE,		/* type */
+	 0,			/* rightshift */
+	 2,			/* size (0 = byte, 1 = short, 2 = long) */
+	 32,			/* bitsize */
+	 false,			/* pc_relative */
+	 0,			/* bitpos */
+	 complain_overflow_bitfield, /* complain_on_overflow */
+	 bfd_elf_generic_reloc,	/* special_function */
+	 "R_ARC_NONE",		/* name */
+	 false,			/* partial_inplace */
+	 0,			/* src_mask */
+	 0,			/* dst_mask */
+	 false),		/* pcrel_offset */
+
+  /* A standard 32 bit relocation.  */
+  HOWTO (R_ARC_32,		/* type */
+	 0,	                /* rightshift */
+	 2,	                /* size (0 = byte, 1 = short, 2 = long) */
+	 32,	                /* bitsize */
+	 false,	                /* pc_relative */
+	 0,	                /* bitpos */
+	 complain_overflow_bitfield, /* complain_on_overflow */
+	 bfd_elf_generic_reloc, /* special_function */
+	 "R_ARC_32",		/* name */
+	 false,	                /* partial_inplace */
+	 0xffffffff,	        /* src_mask */
+	 0xffffffff,   		/* dst_mask */
+	 false),                /* pcrel_offset */
+
+  /* A 26 bit absolute branch, right shifted by 2.  */
+  HOWTO (R_ARC_B26,		/* type */
+	 2,			/* rightshift */
+	 2,			/* size (0 = byte, 1 = short, 2 = long) */
+	 26,			/* bitsize */
+	 false,			/* pc_relative */
+	 0,			/* bitpos */
+	 complain_overflow_bitfield, /* complain_on_overflow */
+	 bfd_elf_generic_reloc,	/* special_function */
+	 "R_ARC_B26",		/* name */
+	 false,			/* partial_inplace */
+	 0x00ffffff,		/* src_mask */
+	 0x00ffffff,		/* dst_mask */
+	 false),		/* pcrel_offset */
+
+  /* A relative 22 bit branch; bits 21-2 are stored in bits 26-7.  */
+  HOWTO (R_ARC_B22_PCREL,	/* type */
+	 2,			/* rightshift */
+	 2,			/* size (0 = byte, 1 = short, 2 = long) */
+	 22,			/* bitsize */
+	 true,			/* pc_relative */
+	 7,			/* bitpos */
+	 complain_overflow_signed, /* complain_on_overflow */
+	 bfd_elf_generic_reloc,	/* special_function */
+	 "R_ARC_B22_PCREL",	/* name */
+	 false,			/* partial_inplace */
+	 0x07ffff80,		/* src_mask */
+	 0x07ffff80,		/* dst_mask */
+	 true),			/* pcrel_offset */
+
+};
+
+/* Map BFD reloc types to ARC ELF reloc types.  */
+
+struct arc_reloc_map
+{
+  bfd_reloc_code_real_type bfd_reloc_val;
+  unsigned char elf_reloc_val;
+};
+
+static const struct arc_reloc_map arc_reloc_map[] =
+{
+  { BFD_RELOC_NONE, R_ARC_NONE, },
+  { BFD_RELOC_32, R_ARC_32 },
+  { BFD_RELOC_CTOR, R_ARC_32 },
+  { BFD_RELOC_ARC_B26, R_ARC_B26 },
+  { BFD_RELOC_ARC_B22_PCREL, R_ARC_B22_PCREL },
+};
+
+static reloc_howto_type *
+bfd_elf32_bfd_reloc_type_lookup (abfd, code)
+     bfd *abfd;
+     bfd_reloc_code_real_type code;
+{
+  unsigned int i;
+
+  for (i = 0;
+       i < sizeof (arc_reloc_map) / sizeof (struct arc_reloc_map);
+       i++)
+    {
+      if (arc_reloc_map[i].bfd_reloc_val == code)
+	return &elf_arc_howto_table[arc_reloc_map[i].elf_reloc_val];
+    }
+
+  return NULL;
+}
+
+/* Set the howto pointer for an ARC ELF reloc.  */
+
+static void
+arc_info_to_howto_rel (abfd, cache_ptr, dst)
+     bfd *abfd;
+     arelent *cache_ptr;
+     Elf32_Internal_Rel *dst;
+{
+  unsigned int r_type;
+
+  r_type = ELF32_R_TYPE (dst->r_info);
+  BFD_ASSERT (r_type < (unsigned int) R_ARC_max);
+  cache_ptr->howto = &elf_arc_howto_table[r_type];
+}
+
+/* Set the right machine number for an ARC ELF file.  */
+
+static boolean
+arc_elf_object_p (abfd)
+     bfd *abfd;
+{
+  int mach;
+  unsigned long arch = elf_elfheader (abfd)->e_flags & EF_ARC_MACH;
+
+  switch (arch)
+    {
+    case E_ARC_MACH_BASE:
+      mach = bfd_mach_arc_base;
+      break;
+    default:
+      /* Unknown cpu type.  ??? What to do?  */
+      return false;
+    }
+
+  (void) bfd_default_set_arch_mach (abfd, bfd_arch_arc, mach);
+  return true;
+}
+
+/* The final processing done just before writing out an ARC ELF object file.
+   This gets the ARC architecture right based on the machine number.  */
+
+static void
+arc_elf_final_write_processing (abfd, linker)
+     bfd *abfd;
+     boolean linker;
+{
+  int mach;
+  unsigned long val;
+
+  switch (mach = bfd_get_mach (abfd))
+    {
+    case bfd_mach_arc_base:
+      val = E_ARC_MACH_BASE;
+      break;
+    default:
+      return;
+    }
+
+  elf_elfheader (abfd)->e_flags &=~ EF_ARC_MACH;
+  elf_elfheader (abfd)->e_flags |= val;
+}
+
+#define TARGET_LITTLE_SYM	bfd_elf32_littlearc_vec
+#define TARGET_LITTLE_NAME	"elf32-littlearc"
+#define TARGET_BIG_SYM		bfd_elf32_bigarc_vec
+#define TARGET_BIG_NAME		"elf32-bigarc"
+#define ELF_ARCH		bfd_arch_arc
+#define ELF_MACHINE_CODE	EM_CYGNUS_ARC
+#define ELF_MAXPAGESIZE		0x1000
+
+#define elf_info_to_howto	0
+#define elf_info_to_howto_rel	arc_info_to_howto_rel
+#define elf_backend_object_p	arc_elf_object_p
+#define elf_backend_final_write_processing \
+				arc_elf_final_write_processing
+
+#include "elf32-target.h"