From 7e0b036d087dfff7f5e306f52fc78745f99454c3 Mon Sep 17 00:00:00 2001
From: Hongxu Jia <hongxu.jia@windriver.com>
Date: Wed, 21 Aug 2019 15:49:52 +0800
Subject: [PATCH] mips backend

Rebase to 0.177
Upstream-Status: Pending [from debian]

Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>

---
 backends/Makefile.am    |   6 +-
 backends/mips_init.c    |  59 ++++++++
 backends/mips_regs.c    | 104 +++++++++++++
 backends/mips_reloc.def |  79 ++++++++++
 backends/mips_retval.c  | 321 ++++++++++++++++++++++++++++++++++++++++
 backends/mips_symbol.c  |  53 +++++++
 libebl/eblopenbackend.c |   3 +
 7 files changed, 623 insertions(+), 2 deletions(-)
 create mode 100644 backends/mips_init.c
 create mode 100644 backends/mips_regs.c
 create mode 100644 backends/mips_reloc.def
 create mode 100644 backends/mips_retval.c
 create mode 100644 backends/mips_symbol.c

diff --git a/backends/Makefile.am b/backends/Makefile.am
index 4755f61..07d45d7 100644
--- a/backends/Makefile.am
+++ b/backends/Makefile.am
@@ -37,7 +37,7 @@ AM_CPPFLAGS += -I$(top_srcdir)/libebl -I$(top_srcdir)/libasm \
 noinst_LIBRARIES = libebl_backends.a libebl_backends_pic.a
 
 modules = i386 sh x86_64 ia64 alpha arm aarch64 sparc ppc ppc64 s390 \
-	  tilegx m68k bpf riscv csky parisc
+	  tilegx m68k bpf riscv csky parisc mips
 
 parisc_SRCS = parisc_init.c parisc_symbol.c parisc_regs.c parisc_retval.c
 
@@ -100,12 +100,14 @@ riscv_SRCS = riscv_init.c riscv_symbol.c riscv_cfi.c riscv_regs.c \
 csky_SRCS = csky_attrs.c csky_init.c csky_symbol.c csky_cfi.c \
 	    csky_regs.c csky_initreg.c csky_corenote.c
 
+mips_SRCS = mips_init.c mips_symbol.c mips_regs.c mips_retval.c
+
 libebl_backends_a_SOURCES = $(i386_SRCS) $(sh_SRCS) $(x86_64_SRCS) \
 			    $(ia64_SRCS) $(alpha_SRCS) $(arm_SRCS) \
 			    $(aarch64_SRCS) $(sparc_SRCS) $(ppc_SRCS) \
 			    $(ppc64_SRCS) $(s390_SRCS) $(tilegx_SRCS) \
 			    $(m68k_SRCS) $(bpf_SRCS) $(riscv_SRCS) $(csky_SRCS) \
-                            $(parisc_SRCS)
+                            $(parisc_SRCS) $(mips_SRCS)
 
 libebl_backends_pic_a_SOURCES =
 am_libebl_backends_pic_a_OBJECTS = $(libebl_backends_a_SOURCES:.c=.os)
diff --git a/backends/mips_init.c b/backends/mips_init.c
new file mode 100644
index 0000000..975c04e
--- /dev/null
+++ b/backends/mips_init.c
@@ -0,0 +1,59 @@
+/* Initialization of mips specific backend library.
+   Copyright (C) 2006 Red Hat, Inc.
+   This file is part of Red Hat elfutils.
+
+   Red Hat elfutils 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; version 2 of the License.
+
+   Red Hat elfutils 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 Red Hat elfutils; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.
+
+   Red Hat elfutils is an included package of the Open Invention Network.
+   An included package of the Open Invention Network is a package for which
+   Open Invention Network licensees cross-license their patents.  No patent
+   license is granted, either expressly or impliedly, by designation as an
+   included package.  Should you wish to participate in the Open Invention
+   Network licensing program, please visit www.openinventionnetwork.com
+   <http://www.openinventionnetwork.com>.  */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#define BACKEND		mips_
+#define RELOC_PREFIX	R_MIPS_
+#include "libebl_CPU.h"
+
+/* This defines the common reloc hooks based on mips_reloc.def.  */
+#include "common-reloc.c"
+
+const char *
+mips_init (Elf *elf __attribute__ ((unused)),
+     GElf_Half machine __attribute__ ((unused)),
+     Ebl *eh,
+     size_t ehlen)
+{
+  /* Check whether the Elf_BH object has a sufficent size.  */
+  if (ehlen < sizeof (Ebl))
+    return NULL;
+
+  /* We handle it.  */
+  if (machine == EM_MIPS)
+    eh->name = "MIPS R3000 big-endian";
+  else if (machine == EM_MIPS_RS3_LE)
+    eh->name = "MIPS R3000 little-endian";
+
+  mips_init_reloc (eh);
+  HOOK (eh, reloc_simple_type);
+  HOOK (eh, return_value_location);
+  HOOK (eh, register_info);
+
+  return MODVERSION;
+}
diff --git a/backends/mips_regs.c b/backends/mips_regs.c
new file mode 100644
index 0000000..44f86cb
--- /dev/null
+++ b/backends/mips_regs.c
@@ -0,0 +1,104 @@
+/* Register names and numbers for MIPS DWARF.
+   Copyright (C) 2006 Red Hat, Inc.
+   This file is part of Red Hat elfutils.
+
+   Red Hat elfutils 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; version 2 of the License.
+
+   Red Hat elfutils 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 Red Hat elfutils; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.
+
+   Red Hat elfutils is an included package of the Open Invention Network.
+   An included package of the Open Invention Network is a package for which
+   Open Invention Network licensees cross-license their patents.  No patent
+   license is granted, either expressly or impliedly, by designation as an
+   included package.  Should you wish to participate in the Open Invention
+   Network licensing program, please visit www.openinventionnetwork.com
+   <http://www.openinventionnetwork.com>.  */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <string.h>
+#include <dwarf.h>
+
+#define BACKEND mips_
+#include "libebl_CPU.h"
+
+ssize_t
+mips_register_info (Ebl *ebl __attribute__((unused)),
+		    int regno, char *name, size_t namelen,
+		    const char **prefix, const char **setname,
+		    int *bits, int *type)
+{
+  if (name == NULL)
+    return 66;
+
+  if (regno < 0 || regno > 65 || namelen < 4)
+    return -1;
+
+  *prefix = "$";
+
+  if (regno < 32)
+    {
+      *setname = "integer";
+      *type = DW_ATE_signed;
+      *bits = 32;
+      if (regno < 32 + 10)
+        {
+          name[0] = regno + '0';
+          namelen = 1;
+        }
+      else
+        {
+          name[0] = (regno / 10) + '0';
+          name[1] = (regno % 10) + '0';
+          namelen = 2;
+        }
+    }
+  else if (regno < 64)
+    {
+      *setname = "FPU";
+      *type = DW_ATE_float;
+      *bits = 32;
+      name[0] = 'f';
+      if (regno < 32 + 10)
+	{
+	  name[1] = (regno - 32) + '0';
+	  namelen = 2;
+	}
+      else
+	{
+	  name[1] = (regno - 32) / 10 + '0';
+	  name[2] = (regno - 32) % 10 + '0';
+	  namelen = 3;
+	}
+    }
+  else if (regno == 64)
+    {
+      *type = DW_ATE_signed;
+      *bits = 32;
+      name[0] = 'h';
+      name[1] = 'i';
+      namelen = 2;
+    }
+  else
+    {
+      *type = DW_ATE_signed;
+      *bits = 32;
+      name[0] = 'l';
+      name[1] = 'o';
+      namelen = 2;
+    }
+
+  name[namelen++] = '\0';
+  return namelen;
+}
diff --git a/backends/mips_reloc.def b/backends/mips_reloc.def
new file mode 100644
index 0000000..4579970
--- /dev/null
+++ b/backends/mips_reloc.def
@@ -0,0 +1,79 @@
+/* List the relocation types for mips.  -*- C -*-
+   Copyright (C) 2006 Red Hat, Inc.
+   This file is part of Red Hat elfutils.
+
+   Red Hat elfutils 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; version 2 of the License.
+
+   Red Hat elfutils 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 Red Hat elfutils; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.
+
+   Red Hat elfutils is an included package of the Open Invention Network.
+   An included package of the Open Invention Network is a package for which
+   Open Invention Network licensees cross-license their patents.  No patent
+   license is granted, either expressly or impliedly, by designation as an
+   included package.  Should you wish to participate in the Open Invention
+   Network licensing program, please visit www.openinventionnetwork.com
+   <http://www.openinventionnetwork.com>.  */
+
+/* 	    NAME,		REL|EXEC|DYN	*/
+
+RELOC_TYPE (NONE,               0)
+RELOC_TYPE (16,                 0)
+RELOC_TYPE (32,                 0)
+RELOC_TYPE (REL32,              0)
+RELOC_TYPE (26,                 0)
+RELOC_TYPE (HI16,               0)
+RELOC_TYPE (LO16,               0)
+RELOC_TYPE (GPREL16,            0)
+RELOC_TYPE (LITERAL,            0)
+RELOC_TYPE (GOT16,              0)
+RELOC_TYPE (PC16,               0)
+RELOC_TYPE (CALL16,             0)
+RELOC_TYPE (GPREL32,            0)
+
+RELOC_TYPE (SHIFT5,             0)
+RELOC_TYPE (SHIFT6,             0)
+RELOC_TYPE (64,                 0)
+RELOC_TYPE (GOT_DISP,           0)
+RELOC_TYPE (GOT_PAGE,           0)
+RELOC_TYPE (GOT_OFST,           0)
+RELOC_TYPE (GOT_HI16,           0)
+RELOC_TYPE (GOT_LO16,           0)
+RELOC_TYPE (SUB,                0)
+RELOC_TYPE (INSERT_A,           0)
+RELOC_TYPE (INSERT_B,           0)
+RELOC_TYPE (DELETE,             0)
+RELOC_TYPE (HIGHER,             0)
+RELOC_TYPE (HIGHEST,            0)
+RELOC_TYPE (CALL_HI16,          0)
+RELOC_TYPE (CALL_LO16,          0)
+RELOC_TYPE (SCN_DISP,           0)
+RELOC_TYPE (REL16,              0)
+RELOC_TYPE (ADD_IMMEDIATE,      0)
+RELOC_TYPE (PJUMP,              0)
+RELOC_TYPE (RELGOT,             0)
+RELOC_TYPE (JALR,               0)
+RELOC_TYPE (TLS_DTPMOD32,       0)
+RELOC_TYPE (TLS_DTPREL32,       0)
+RELOC_TYPE (TLS_DTPMOD64,       0)
+RELOC_TYPE (TLS_DTPREL64,       0)
+RELOC_TYPE (TLS_GD,             0)
+RELOC_TYPE (TLS_LDM,            0)
+RELOC_TYPE (TLS_DTPREL_HI16,    0)
+RELOC_TYPE (TLS_DTPREL_LO16,    0)
+RELOC_TYPE (TLS_GOTTPREL,       0)
+RELOC_TYPE (TLS_TPREL32,        0)
+RELOC_TYPE (TLS_TPREL64,        0)
+RELOC_TYPE (TLS_TPREL_HI16,     0)
+RELOC_TYPE (TLS_TPREL_LO16,     0)
+
+#define NO_COPY_RELOC 1
+#define NO_RELATIVE_RELOC 1
diff --git a/backends/mips_retval.c b/backends/mips_retval.c
new file mode 100644
index 0000000..656cd1f
--- /dev/null
+++ b/backends/mips_retval.c
@@ -0,0 +1,321 @@
+/* Function return value location for Linux/mips ABI.
+   Copyright (C) 2005 Red Hat, Inc.
+   This file is part of Red Hat elfutils.
+
+   Red Hat elfutils 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; version 2 of the License.
+
+   Red Hat elfutils 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 Red Hat elfutils; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.
+
+   Red Hat elfutils is an included package of the Open Invention Network.
+   An included package of the Open Invention Network is a package for which
+   Open Invention Network licensees cross-license their patents.  No patent
+   license is granted, either expressly or impliedly, by designation as an
+   included package.  Should you wish to participate in the Open Invention
+   Network licensing program, please visit www.openinventionnetwork.com
+   <http://www.openinventionnetwork.com>.  */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <string.h>
+#include <assert.h>
+#include <dwarf.h>
+#include <elf.h>
+
+#include "../libebl/libeblP.h"
+#include "../libdw/libdwP.h"
+
+#define BACKEND mips_
+#include "libebl_CPU.h"
+
+/* The ABI of the file.  Also see EF_MIPS_ABI2 above. */
+#define EF_MIPS_ABI		0x0000F000
+
+/* The original o32 abi. */
+#define E_MIPS_ABI_O32          0x00001000
+
+/* O32 extended to work on 64 bit architectures */
+#define E_MIPS_ABI_O64          0x00002000
+
+/* EABI in 32 bit mode */
+#define E_MIPS_ABI_EABI32       0x00003000
+
+/* EABI in 64 bit mode */
+#define E_MIPS_ABI_EABI64       0x00004000
+
+/* All the possible MIPS ABIs. */
+enum mips_abi
+  {
+    MIPS_ABI_UNKNOWN = 0,
+    MIPS_ABI_N32,
+    MIPS_ABI_O32,
+    MIPS_ABI_N64,
+    MIPS_ABI_O64,
+    MIPS_ABI_EABI32,
+    MIPS_ABI_EABI64,
+    MIPS_ABI_LAST
+  };
+
+/* Find the mips ABI of the current file */
+enum mips_abi find_mips_abi(Elf *elf)
+{
+  GElf_Ehdr ehdr_mem;
+  GElf_Ehdr *ehdr = gelf_getehdr (elf, &ehdr_mem);
+
+  if (ehdr == NULL)
+    return MIPS_ABI_LAST;
+
+  GElf_Word elf_flags = ehdr->e_flags;
+
+  /* Check elf_flags to see if it specifies the ABI being used.  */
+  switch ((elf_flags & EF_MIPS_ABI))
+    {
+    case E_MIPS_ABI_O32:
+      return MIPS_ABI_O32;
+    case E_MIPS_ABI_O64:
+      return MIPS_ABI_O64;
+    case E_MIPS_ABI_EABI32:
+      return MIPS_ABI_EABI32;
+    case E_MIPS_ABI_EABI64:
+      return MIPS_ABI_EABI64;
+    default:
+      if ((elf_flags & EF_MIPS_ABI2))
+	return MIPS_ABI_N32;
+    }
+
+  /* GCC creates a pseudo-section whose name describes the ABI.  */
+  size_t shstrndx;
+  if (elf_getshdrstrndx (elf, &shstrndx) < 0)
+    return MIPS_ABI_LAST;
+
+  const char *name;
+  Elf_Scn *scn = NULL;
+  while ((scn = elf_nextscn (elf, scn)) != NULL)
+    {
+      GElf_Shdr shdr_mem;
+      GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
+      if (shdr == NULL)
+        return MIPS_ABI_LAST;
+
+      name = elf_strptr (elf, shstrndx, shdr->sh_name) ?: "";
+      if (strncmp (name, ".mdebug.", 8) != 0)
+        continue;
+
+      if (strcmp (name, ".mdebug.abi32") == 0)
+        return MIPS_ABI_O32;
+      else if (strcmp (name, ".mdebug.abiN32") == 0)
+        return MIPS_ABI_N32;
+      else if (strcmp (name, ".mdebug.abi64") == 0)
+        return MIPS_ABI_N64;
+      else if (strcmp (name, ".mdebug.abiO64") == 0)
+        return MIPS_ABI_O64;
+      else if (strcmp (name, ".mdebug.eabi32") == 0)
+        return MIPS_ABI_EABI32;
+      else if (strcmp (name, ".mdebug.eabi64") == 0)
+        return MIPS_ABI_EABI64;
+      else
+        return MIPS_ABI_UNKNOWN;
+    }
+
+  return MIPS_ABI_UNKNOWN;
+}
+
+unsigned int
+mips_abi_regsize (enum mips_abi abi)
+{
+  switch (abi)
+    {
+    case MIPS_ABI_EABI32:
+    case MIPS_ABI_O32:
+      return 4;
+    case MIPS_ABI_N32:
+    case MIPS_ABI_N64:
+    case MIPS_ABI_O64:
+    case MIPS_ABI_EABI64:
+      return 8;
+    case MIPS_ABI_UNKNOWN:
+    case MIPS_ABI_LAST:
+    default:
+      return 0;
+    }
+}
+
+
+/* $v0 or pair $v0, $v1 */
+static const Dwarf_Op loc_intreg_o32[] =
+  {
+    { .atom = DW_OP_reg2 }, { .atom = DW_OP_piece, .number = 4 },
+    { .atom = DW_OP_reg3 }, { .atom = DW_OP_piece, .number = 4 },
+  };
+
+static const Dwarf_Op loc_intreg[] =
+  {
+    { .atom = DW_OP_reg2 }, { .atom = DW_OP_piece, .number = 8 },
+    { .atom = DW_OP_reg3 }, { .atom = DW_OP_piece, .number = 8 },
+  };
+#define nloc_intreg	1
+#define nloc_intregpair	4
+
+/* $f0 (float), or pair $f0, $f1 (double).
+ * f2/f3 are used for COMPLEX (= 2 doubles) returns in Fortran */
+static const Dwarf_Op loc_fpreg_o32[] =
+  {
+    { .atom = DW_OP_regx, .number = 32 }, { .atom = DW_OP_piece, .number = 4 },
+    { .atom = DW_OP_regx, .number = 33 }, { .atom = DW_OP_piece, .number = 4 },
+    { .atom = DW_OP_regx, .number = 34 }, { .atom = DW_OP_piece, .number = 4 },
+    { .atom = DW_OP_regx, .number = 35 }, { .atom = DW_OP_piece, .number = 4 },
+  };
+
+/* $f0, or pair $f0, $f2.  */
+static const Dwarf_Op loc_fpreg[] =
+  {
+    { .atom = DW_OP_regx, .number = 32 }, { .atom = DW_OP_piece, .number = 8 },
+    { .atom = DW_OP_regx, .number = 34 }, { .atom = DW_OP_piece, .number = 8 },
+  };
+#define nloc_fpreg  1
+#define nloc_fpregpair 4
+#define nloc_fpregquad 8
+
+/* The return value is a structure and is actually stored in stack space
+   passed in a hidden argument by the caller.  But, the compiler
+   helpfully returns the address of that space in $v0.  */
+static const Dwarf_Op loc_aggregate[] =
+  {
+    { .atom = DW_OP_breg2, .number = 0 }
+  };
+#define nloc_aggregate 1
+
+int
+mips_return_value_location (Dwarf_Die *functypedie, const Dwarf_Op **locp)
+{
+  /* First find the ABI used by the elf object */
+  enum mips_abi abi = find_mips_abi(functypedie->cu->dbg->elf);
+
+  /* Something went seriously wrong while trying to figure out the ABI */
+  if (abi == MIPS_ABI_LAST)
+    return -1;
+
+  /* We couldn't identify the ABI, but the file seems valid */
+  if (abi == MIPS_ABI_UNKNOWN)
+    return -2;
+
+  /* Can't handle EABI variants */
+  if ((abi == MIPS_ABI_EABI32) || (abi == MIPS_ABI_EABI64))
+    return -2;
+
+  unsigned int regsize = mips_abi_regsize (abi);
+  if (!regsize)
+    return -2;
+
+  /* Start with the function's type, and get the DW_AT_type attribute,
+     which is the type of the return value.  */
+
+  Dwarf_Attribute attr_mem;
+  Dwarf_Attribute *attr = dwarf_attr_integrate (functypedie, DW_AT_type, &attr_mem);
+  if (attr == NULL)
+    /* The function has no return value, like a `void' function in C.  */
+    return 0;
+
+  Dwarf_Die die_mem;
+  Dwarf_Die *typedie = dwarf_formref_die (attr, &die_mem);
+  int tag = dwarf_tag (typedie);
+
+  /* Follow typedefs and qualifiers to get to the actual type.  */
+  while (tag == DW_TAG_typedef
+	 || tag == DW_TAG_const_type || tag == DW_TAG_volatile_type
+	 || tag == DW_TAG_restrict_type)
+    {
+      attr = dwarf_attr_integrate (typedie, DW_AT_type, &attr_mem);
+      typedie = dwarf_formref_die (attr, &die_mem);
+      tag = dwarf_tag (typedie);
+    }
+
+  switch (tag)
+    {
+    case -1:
+      return -1;
+
+    case DW_TAG_subrange_type:
+      if (! dwarf_hasattr_integrate (typedie, DW_AT_byte_size))
+	{
+	  attr = dwarf_attr_integrate (typedie, DW_AT_type, &attr_mem);
+	  typedie = dwarf_formref_die (attr, &die_mem);
+	  tag = dwarf_tag (typedie);
+	}
+      /* Fall through.  */
+
+    case DW_TAG_base_type:
+    case DW_TAG_enumeration_type:
+    case DW_TAG_pointer_type:
+    case DW_TAG_ptr_to_member_type:
+      {
+        Dwarf_Word size;
+	if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_byte_size,
+					 &attr_mem), &size) != 0)
+	  {
+	    if (tag == DW_TAG_pointer_type || tag == DW_TAG_ptr_to_member_type)
+	      size = regsize;
+	    else
+	      return -1;
+	  }
+	if (tag == DW_TAG_base_type)
+	  {
+	    Dwarf_Word encoding;
+	    if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_encoding,
+					     &attr_mem), &encoding) != 0)
+	      return -1;
+
+#define ABI_LOC(loc, regsize) ((regsize) == 4 ? (loc ## _o32) : (loc))
+
+	    if (encoding == DW_ATE_float)
+	      {
+		*locp = ABI_LOC(loc_fpreg, regsize);
+		if (size <= regsize)
+		    return nloc_fpreg;
+
+		if (size <= 2*regsize)
+                  return nloc_fpregpair;
+
+		if (size <= 4*regsize && abi == MIPS_ABI_O32)
+                  return nloc_fpregquad;
+
+		goto aggregate;
+	      }
+	  }
+	*locp = ABI_LOC(loc_intreg, regsize);
+	if (size <= regsize)
+	  return nloc_intreg;
+	if (size <= 2*regsize)
+	  return nloc_intregpair;
+
+	/* Else fall through. Shouldn't happen though (at least with gcc) */
+      }
+
+    case DW_TAG_structure_type:
+    case DW_TAG_class_type:
+    case DW_TAG_union_type:
+    case DW_TAG_array_type:
+    aggregate:
+      /* XXX TODO: Can't handle structure return with other ABI's yet :-/ */
+      if ((abi != MIPS_ABI_O32) && (abi != MIPS_ABI_O64))
+        return -2;
+
+      *locp = loc_aggregate;
+      return nloc_aggregate;
+    }
+
+  /* XXX We don't have a good way to return specific errors from ebl calls.
+     This value means we do not understand the type, but it is well-formed
+     DWARF and might be valid.  */
+  return -2;
+}
diff --git a/backends/mips_symbol.c b/backends/mips_symbol.c
new file mode 100644
index 0000000..261b05d
--- /dev/null
+++ b/backends/mips_symbol.c
@@ -0,0 +1,53 @@
+/* MIPS specific symbolic name handling.
+   Copyright (C) 2002, 2003, 2005 Red Hat, Inc.
+   This file is part of Red Hat elfutils.
+   Written by Jakub Jelinek <jakub@redhat.com>, 2002.
+
+   Red Hat elfutils 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; version 2 of the License.
+
+   Red Hat elfutils 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 Red Hat elfutils; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.
+
+   Red Hat elfutils is an included package of the Open Invention Network.
+   An included package of the Open Invention Network is a package for which
+   Open Invention Network licensees cross-license their patents.  No patent
+   license is granted, either expressly or impliedly, by designation as an
+   included package.  Should you wish to participate in the Open Invention
+   Network licensing program, please visit www.openinventionnetwork.com
+   <http://www.openinventionnetwork.com>.  */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <elf.h>
+#include <stddef.h>
+
+#define BACKEND		mips_
+#include "libebl_CPU.h"
+
+/* Check for the simple reloc types.  */
+Elf_Type
+mips_reloc_simple_type (Ebl *ebl __attribute__ ((unused)), int type,
+                        int *addsub __attribute__ ((unused)))
+{
+  switch (type)
+    {
+    case R_MIPS_16:
+      return ELF_T_HALF;
+    case R_MIPS_32:
+      return ELF_T_WORD;
+    case R_MIPS_64:
+      return ELF_T_XWORD;
+    default:
+      return ELF_T_NUM;
+    }
+}
diff --git a/libebl/eblopenbackend.c b/libebl/eblopenbackend.c
index 210b47e..1feac13 100644
--- a/libebl/eblopenbackend.c
+++ b/libebl/eblopenbackend.c
@@ -57,6 +57,7 @@ const char *m68k_init (Elf *, GElf_Half, Ebl *, size_t);
 const char *bpf_init (Elf *, GElf_Half, Ebl *, size_t);
 const char *riscv_init (Elf *, GElf_Half, Ebl *, size_t);
 const char *csky_init (Elf *, GElf_Half, Ebl *, size_t);
+const char *mips_init (Elf *, GElf_Half, Ebl *, size_t);
 
 /* This table should contain the complete list of architectures as far
    as the ELF specification is concerned.  */
@@ -87,6 +88,8 @@ static const struct
   { sparc_init, "elf_sparc", "sparc", 5, EM_SPARC, 0, 0 },
   { sparc_init, "elf_sparcv8plus", "sparc", 5, EM_SPARC32PLUS, 0, 0 },
   { s390_init, "ebl_s390", "s390", 4, EM_S390, 0, 0 },
+  { mips_init, "elf_mips", "mips", 4, EM_MIPS, 0, 0 },
+  { mips_init, "elf_mipsel", "mipsel", 4, EM_MIPS_RS3_LE, 0, 0 },
 
   { NULL, "elf_m32", "m32", 3, EM_M32, 0, 0 },
   { m68k_init, "elf_m68k", "m68k", 4, EM_68K, ELFCLASS32, ELFDATA2MSB },
-- 
2.17.1

