Initial revision

1 files changed, 468 insertions, 0 deletions

diff --git a/bfd/mipsbsd.c b/bfd/mipsbsd.c
new file mode 100644
index 0000000000..e7ba68dde6
--- /dev/null
+++ b/bfd/mipsbsd.c
@@ -0,0 +1,468 @@
+/* BFD backend for MIPS BSD (a.out) binaries.
+   Copyright (C) 1993, 94, 95, 97, 1998 Free Software Foundation, Inc.
+   Written by Ralph Campbell.
+
+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.  */
+
+#define BYTES_IN_WORD 4
+/* #define ENTRY_CAN_BE_ZERO */
+#define N_HEADER_IN_TEXT(x) 1
+#define N_SHARED_LIB(x) 0
+#define N_TXTADDR(x) \
+    (N_MAGIC(x) != ZMAGIC ? (x).a_entry :	/* object file or NMAGIC */\
+	    TEXT_START_ADDR + EXEC_BYTES_SIZE	/* no padding */\
+    )
+#define N_DATADDR(x) (N_TXTADDR(x)+N_TXTSIZE(x))
+#define TEXT_START_ADDR 4096
+#define TARGET_PAGE_SIZE 4096
+#define SEGMENT_SIZE TARGET_PAGE_SIZE
+#define DEFAULT_ARCH bfd_arch_mips
+#define MACHTYPE_OK(mtype) ((mtype) == M_UNKNOWN \
+			    || (mtype) == M_MIPS1 || (mtype) == M_MIPS2)
+#define MY_symbol_leading_char '\0'
+
+#define MY(OP) CAT(mipsbsd_,OP)
+
+#include "bfd.h"
+#include "sysdep.h"
+#include "libbfd.h"
+#include "libaout.h"
+
+#define SET_ARCH_MACH(ABFD, EXEC) \
+  MY(set_arch_mach)(ABFD, N_MACHTYPE (EXEC)); \
+  MY(choose_reloc_size)(ABFD);
+static void MY(set_arch_mach) PARAMS ((bfd *abfd, int machtype));
+static void MY(choose_reloc_size) PARAMS ((bfd *abfd));
+
+#define MY_write_object_contents MY(write_object_contents)
+static boolean MY(write_object_contents) PARAMS ((bfd *abfd));
+
+/* We can't use MY(x) here because it leads to a recursive call to CAT
+   when expanded inside JUMP_TABLE.  */
+#define MY_bfd_reloc_type_lookup mipsbsd_reloc_howto_type_lookup
+#define MY_canonicalize_reloc mipsbsd_canonicalize_reloc
+
+#define MY_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
+#define MY_bfd_link_add_symbols _bfd_generic_link_add_symbols
+#define MY_final_link_callback unused
+#define MY_bfd_final_link _bfd_generic_final_link
+
+#define MY_backend_data &MY(backend_data)
+#define MY_BFD_TARGET
+
+#include "aout-target.h"
+
+static void
+MY(set_arch_mach) (abfd, machtype)
+     bfd *abfd;
+     int machtype;
+{
+  enum bfd_architecture arch;
+  long machine;
+
+  /* Determine the architecture and machine type of the object file. */
+  switch (machtype) {
+
+  case M_MIPS1:
+    arch = bfd_arch_mips;
+    machine = 3000;
+    break;
+
+  case M_MIPS2:
+    arch = bfd_arch_mips;
+    machine = 4000;
+    break;
+
+  default:
+    arch = bfd_arch_obscure;
+    machine = 0;
+    break;
+  }
+  bfd_set_arch_mach(abfd, arch, machine);  
+}
+
+/* Determine the size of a relocation entry, based on the architecture */
+static void
+MY(choose_reloc_size) (abfd)
+     bfd *abfd;
+{
+  switch (bfd_get_arch(abfd)) {
+  case bfd_arch_sparc:
+  case bfd_arch_a29k:
+  case bfd_arch_mips:
+    obj_reloc_entry_size (abfd) = RELOC_EXT_SIZE;
+    break;
+  default:
+    obj_reloc_entry_size (abfd) = RELOC_STD_SIZE;
+    break;
+  }
+}
+
+/* Write an object file in BSD a.out format.
+  Section contents have already been written.  We write the
+  file header, symbols, and relocation.  */
+
+static boolean
+MY(write_object_contents) (abfd)
+     bfd *abfd;
+{
+  struct external_exec exec_bytes;
+  struct internal_exec *execp = exec_hdr (abfd);
+
+  /* Magic number, maestro, please!  */
+  switch (bfd_get_arch(abfd)) {
+  case bfd_arch_m68k:
+    switch (bfd_get_mach(abfd)) {
+    case bfd_mach_m68010:
+      N_SET_MACHTYPE(*execp, M_68010);
+      break;
+    default:
+    case bfd_mach_m68020:
+      N_SET_MACHTYPE(*execp, M_68020);
+      break;
+    }
+    break;
+  case bfd_arch_sparc:
+    N_SET_MACHTYPE(*execp, M_SPARC);
+    break;
+  case bfd_arch_i386:
+    N_SET_MACHTYPE(*execp, M_386);
+    break;
+  case bfd_arch_a29k:
+    N_SET_MACHTYPE(*execp, M_29K);
+    break;
+  case bfd_arch_mips:
+    switch (bfd_get_mach(abfd)) {
+    case 4000:
+    case 6000:
+      N_SET_MACHTYPE(*execp, M_MIPS2);
+      break;
+    default:
+      N_SET_MACHTYPE(*execp, M_MIPS1);
+      break;
+    }
+    break;
+  default:
+    N_SET_MACHTYPE(*execp, M_UNKNOWN);
+  }
+
+  MY(choose_reloc_size)(abfd);
+
+  WRITE_HEADERS(abfd, execp);
+
+  return true;
+}
+
+/*
+ * MIPS relocation types.
+ */
+#define MIPS_RELOC_32		0
+#define MIPS_RELOC_JMP		1
+#define MIPS_RELOC_WDISP16	2
+#define MIPS_RELOC_HI16		3
+#define MIPS_RELOC_HI16_S	4
+#define MIPS_RELOC_LO16		5
+
+/*
+ * This is only called when performing a BFD_RELOC_MIPS_JMP relocation.
+ * The jump destination address is formed from the upper 4 bits of the
+ * "current" program counter concatenated with the jump instruction's
+ * 26 bit field and two trailing zeros.
+ * If the destination address is not in the same segment as the "current"
+ * program counter, then we need to signal an error.
+ */
+static bfd_reloc_status_type
+mips_fix_jmp_addr (abfd,reloc_entry,symbol,data,input_section,output_bfd)
+     bfd *abfd;
+     arelent *reloc_entry;
+     struct symbol_cache_entry *symbol;
+     PTR data;
+     asection *input_section;
+     bfd *output_bfd;
+{
+  bfd_vma relocation, pc;
+ 
+  /* If this is a partial relocation, just continue. */
+  if (output_bfd != (bfd *)NULL)
+    return bfd_reloc_continue;
+
+  /* If this is an undefined symbol, return error */
+  if (bfd_is_und_section (symbol->section)
+      && (symbol->flags & BSF_WEAK) == 0)
+    return bfd_reloc_undefined;
+
+  /* 
+   * Work out which section the relocation is targetted at and the
+   * initial relocation command value.
+   */
+  if (bfd_is_com_section (symbol->section))
+    relocation = 0;
+  else
+    relocation = symbol->value;
+
+  relocation += symbol->section->output_section->vma;
+  relocation += symbol->section->output_offset;
+  relocation += reloc_entry->addend;
+
+  pc = input_section->output_section->vma + input_section->output_offset +
+    reloc_entry->address + 4;
+
+  if ((relocation & 0xF0000000) != (pc & 0xF0000000))
+    return bfd_reloc_overflow;
+
+  return bfd_reloc_continue;
+}
+
+/*
+ * This is only called when performing a BFD_RELOC_HI16_S relocation.
+ * We need to see if bit 15 is set in the result. If it is, we add
+ * 0x10000 and continue normally. This will compensate for the sign extension
+ * when the low bits are added at run time.
+ */
+static bfd_reloc_status_type
+mips_fix_hi16_s PARAMS ((bfd *, arelent *, asymbol *, PTR,
+			 asection *, bfd *, char **));
+
+static bfd_reloc_status_type
+mips_fix_hi16_s (abfd, reloc_entry, symbol, data, input_section,
+		 output_bfd, error_message)
+     bfd *abfd;
+     arelent *reloc_entry;
+     asymbol *symbol;
+     PTR data;
+     asection *input_section;
+     bfd *output_bfd;
+     char **error_message;
+{
+  bfd_vma relocation;
+ 
+  /* If this is a partial relocation, just continue. */
+  if (output_bfd != (bfd *)NULL)
+    return bfd_reloc_continue;
+
+  /* If this is an undefined symbol, return error */
+  if (bfd_is_und_section (symbol->section)
+      && (symbol->flags & BSF_WEAK) == 0)
+    return bfd_reloc_undefined;
+
+  /* 
+   * Work out which section the relocation is targetted at and the
+   * initial relocation command value.
+   */
+  if (bfd_is_com_section (symbol->section))
+    relocation = 0;
+  else
+    relocation = symbol->value;
+
+  relocation += symbol->section->output_section->vma;
+  relocation += symbol->section->output_offset;
+  relocation += reloc_entry->addend;
+
+  if (relocation & 0x8000)
+    reloc_entry->addend += 0x10000;
+
+  return bfd_reloc_continue;
+}
+
+static reloc_howto_type mips_howto_table_ext[] = {
+  {MIPS_RELOC_32,      0, 2, 32, false, 0,  complain_overflow_bitfield, 0,
+	"32",       false, 0, 0xffffffff, false},
+  {MIPS_RELOC_JMP,     2, 2, 26, false, 0, complain_overflow_dont,
+	mips_fix_jmp_addr,
+	"MIPS_JMP", false, 0, 0x03ffffff, false},
+  {MIPS_RELOC_WDISP16, 2, 2, 16, true,  0, complain_overflow_signed, 0,
+	"WDISP16",  false, 0, 0x0000ffff, false},
+  {MIPS_RELOC_HI16,   16, 2, 16, false, 0, complain_overflow_bitfield, 0,
+	"HI16",     false, 0, 0x0000ffff, false},
+  {MIPS_RELOC_HI16_S, 16, 2, 16, false, 0, complain_overflow_bitfield,
+        mips_fix_hi16_s,
+        "HI16_S",   false, 0, 0x0000ffff, false},
+  {MIPS_RELOC_LO16,    0, 2, 16, false, 0, complain_overflow_dont, 0,
+	"LO16",     false, 0, 0x0000ffff, false},
+};
+
+static reloc_howto_type *
+MY(reloc_howto_type_lookup) (abfd, code)
+     bfd *abfd;
+     bfd_reloc_code_real_type code;
+{
+
+  if (bfd_get_arch (abfd) != bfd_arch_mips)
+    return 0;
+
+  switch (code)
+    {
+    case BFD_RELOC_CTOR:
+    case BFD_RELOC_32:
+      return (&mips_howto_table_ext[MIPS_RELOC_32]);
+    case BFD_RELOC_MIPS_JMP:
+      return (&mips_howto_table_ext[MIPS_RELOC_JMP]);
+    case BFD_RELOC_16_PCREL_S2:
+      return (&mips_howto_table_ext[MIPS_RELOC_WDISP16]);
+    case BFD_RELOC_HI16:
+      return (&mips_howto_table_ext[MIPS_RELOC_HI16]);
+    case BFD_RELOC_HI16_S:
+      return (&mips_howto_table_ext[MIPS_RELOC_HI16_S]);
+    case BFD_RELOC_LO16:
+      return (&mips_howto_table_ext[MIPS_RELOC_LO16]);
+    default:
+      return 0;
+    }
+}
+
+/*
+ * This is just like the standard aoutx.h version but we need to do our
+ * own mapping of external reloc type values to howto entries.
+ */
+long
+MY(canonicalize_reloc)(abfd, section, relptr, symbols)
+      bfd *abfd;
+      sec_ptr section;
+      arelent **relptr;
+      asymbol **symbols;
+{
+  arelent *tblptr = section->relocation;
+  unsigned int count, c;
+  extern reloc_howto_type NAME(aout,ext_howto_table)[];
+
+  /* If we have already read in the relocation table, return the values. */
+  if (section->flags & SEC_CONSTRUCTOR) {
+    arelent_chain *chain = section->constructor_chain;
+
+    for (count = 0; count < section->reloc_count; count++) {
+      *relptr++ = &chain->relent;
+      chain = chain->next;
+    }
+    *relptr = 0;
+    return section->reloc_count;
+  }
+  if (tblptr && section->reloc_count) {
+    for (count = 0; count++ < section->reloc_count;) 
+      *relptr++ = tblptr++;
+    *relptr = 0;
+    return section->reloc_count;
+  }
+
+  if (!NAME(aout,slurp_reloc_table)(abfd, section, symbols))
+    return -1;
+  tblptr = section->relocation;
+
+  /* fix up howto entries */
+  for (count = 0; count++ < section->reloc_count;) 
+    {
+      c = tblptr->howto - NAME(aout,ext_howto_table);
+      tblptr->howto = &mips_howto_table_ext[c];
+
+      *relptr++ = tblptr++;
+    }
+  *relptr = 0;
+  return section->reloc_count;
+}
+
+static CONST struct aout_backend_data MY(backend_data) = {
+  0,				/* zmagic contiguous */
+  1,				/* text incl header */
+  0,				/* entry is text address */
+  0,				/* exec_hdr_flags */
+  TARGET_PAGE_SIZE,			/* text vma */
+  MY_set_sizes,
+  0,				/* text size includes exec header */
+  0,				/* add_dynamic_symbols */
+  0,				/* add_one_symbol */
+  0,				/* link_dynamic_object */
+  0,				/* write_dynamic_symbol */
+  0,				/* check_dynamic_reloc */
+  0				/* finish_dynamic_link */
+};
+
+const bfd_target aout_mips_little_vec =
+{
+  "a.out-mips-little",		/* name */
+  bfd_target_aout_flavour,
+  BFD_ENDIAN_LITTLE,		/* target byte order (little) */
+  BFD_ENDIAN_LITTLE,		/* target headers byte order (little) */
+  (HAS_RELOC | EXEC_P |		/* object flags */
+   HAS_LINENO | HAS_DEBUG |
+   HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
+  (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE | SEC_DATA),
+  MY_symbol_leading_char,
+  ' ',				/* ar_pad_char */
+  15,				/* ar_max_namelen */
+  bfd_getl64, bfd_getl_signed_64, bfd_putl64,
+     bfd_getl32, bfd_getl_signed_32, bfd_putl32,
+     bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
+  bfd_getl64, bfd_getl_signed_64, bfd_putl64,
+     bfd_getl32, bfd_getl_signed_32, bfd_putl32,
+     bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
+    {_bfd_dummy_target, MY_object_p, /* bfd_check_format */
+       bfd_generic_archive_p, MY_core_file_p},
+    {bfd_false, MY_mkobject,	/* bfd_set_format */
+       _bfd_generic_mkarchive, bfd_false},
+    {bfd_false, MY_write_object_contents, /* bfd_write_contents */
+       _bfd_write_archive_contents, bfd_false},
+
+     BFD_JUMP_TABLE_GENERIC (MY),
+     BFD_JUMP_TABLE_COPY (MY),
+     BFD_JUMP_TABLE_CORE (MY),
+     BFD_JUMP_TABLE_ARCHIVE (MY),
+     BFD_JUMP_TABLE_SYMBOLS (MY),
+     BFD_JUMP_TABLE_RELOCS (MY),
+     BFD_JUMP_TABLE_WRITE (MY),
+     BFD_JUMP_TABLE_LINK (MY),
+     BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
+
+  (PTR) MY_backend_data,
+};
+
+const bfd_target aout_mips_big_vec =
+{
+  "a.out-mips-big",		/* name */
+  bfd_target_aout_flavour,
+  BFD_ENDIAN_BIG,		/* target byte order (big) */
+  BFD_ENDIAN_BIG,		/* target headers byte order (big) */
+  (HAS_RELOC | EXEC_P |		/* object flags */
+   HAS_LINENO | HAS_DEBUG |
+   HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
+  (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE | SEC_DATA),
+  MY_symbol_leading_char,
+  ' ',				/* ar_pad_char */
+  15,				/* ar_max_namelen */
+  bfd_getb64, bfd_getb_signed_64, bfd_putb64,
+     bfd_getb32, bfd_getb_signed_32, bfd_putb32,
+     bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* data */
+  bfd_getb64, bfd_getb_signed_64, bfd_putb64,
+     bfd_getb32, bfd_getb_signed_32, bfd_putb32,
+     bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */
+    {_bfd_dummy_target, MY_object_p, /* bfd_check_format */
+       bfd_generic_archive_p, MY_core_file_p},
+    {bfd_false, MY_mkobject,	/* bfd_set_format */
+       _bfd_generic_mkarchive, bfd_false},
+    {bfd_false, MY_write_object_contents, /* bfd_write_contents */
+       _bfd_write_archive_contents, bfd_false},
+
+     BFD_JUMP_TABLE_GENERIC (MY),
+     BFD_JUMP_TABLE_COPY (MY),
+     BFD_JUMP_TABLE_CORE (MY),
+     BFD_JUMP_TABLE_ARCHIVE (MY),
+     BFD_JUMP_TABLE_SYMBOLS (MY),
+     BFD_JUMP_TABLE_RELOCS (MY),
+     BFD_JUMP_TABLE_WRITE (MY),
+     BFD_JUMP_TABLE_LINK (MY),
+     BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
+
+  (PTR) MY_backend_data,
+};