Filled out the object file loader so it can load object files for several OSs and architectures.

SConscript:
    Added ./libelf as an include search directory. There might be a better spot for this than where I put it.
arch/SConscript:
    Combined the linux_process.h and tru64_process.h into process.h. This allows each ISA to support processes from arbitrary OSs.
arch/alpha/SConscript:
    Added process.cc as a source file. It provides an implementation of createProcess, which takes an object_file object and creates the appropriate process object, or dies.
base/loader/elf_object.cc:
    Actually extract the OS and architecture from the elf file, rather than always guessing Alpha and Linux.
base/loader/object_file.hh:
    Added constants for SPARC, MIPS, and Solaris, and changed the include for the Addr type.
sim/process.cc:
    Pushed creation of specific process objects into the ISA specific code.

--HG--
extra : convert_revision : b4754e7ca8328672d07e1394c4d162e199606b53

12 files changed, 368 insertions, 32 deletions

diff --git a/SConscript b/SConscript
index 51836b0be..1f68011b6 100644
--- a/SConscript
+++ b/SConscript
@@ -374,6 +374,7 @@ def make_objs(sources, env):
 # the corresponding build directory to pick up generated include
 # files.
 env.Append(CPPPATH='.')
+env.Append(CPPPATH='./libelf')
 
 # Debug binary
 debugEnv = env.Copy(OBJSUFFIX='.do')
diff --git a/arch/SConscript b/arch/SConscript
index 5783b39dd..b4b7a1ddb 100644
--- a/arch/SConscript
+++ b/arch/SConscript
@@ -46,9 +46,8 @@ sources = []
 # List of headers to generate
 isa_switch_hdrs = Split('''
 	isa_traits.hh
-	linux_process.hh
-	tru64_process.hh
 	tlb.hh
+	process.hh
 	aout_machdep.h
 	ecoff_machdep.h
 	arguments.hh
diff --git a/arch/alpha/SConscript b/arch/alpha/SConscript
index 3b0e69b7a..03d73eef7 100644
--- a/arch/alpha/SConscript
+++ b/arch/alpha/SConscript
@@ -64,6 +64,7 @@ syscall_emulation_sources = Split('''
 	common_syscall_emul.cc
 	linux_process.cc
 	tru64_process.cc
+	process.cc
 	''')
 
 # Set up complete list of sources based on configuration.
diff --git a/arch/alpha/process.cc b/arch/alpha/process.cc
new file mode 100644
index 000000000..b2dbe7ad1
--- /dev/null
+++ b/arch/alpha/process.cc
@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2003-2004 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "arch/alpha/process.hh"
+
+namespace AlphaISA
+{
+
+LiveProcess *
+createProcess(const std::string &nm, ObjectFile * objFile,
+        int stdin_fd, int stdout_fd, int stderr_fd,
+        std::vector<std::string> &argv, std::vector<std::string> &envp)
+{
+    LiveProcess * process = NULL;
+    if (objFile->getArch() != ObjectFile::Alpha)
+        fatal("Object file does not match architecture.");
+    switch (objFile->getOpSys()) {
+      case ObjectFile::Tru64:
+        process = new AlphaTru64Process(nm, objFile,
+                                        stdin_fd, stdout_fd, stderr_fd,
+                                        argv, envp);
+        break;
+
+      case ObjectFile::Linux:
+        process = new AlphaLinuxProcess(nm, objFile,
+                                        stdin_fd, stdout_fd, stderr_fd,
+                                        argv, envp);
+        break;
+
+      default:
+        fatal("Unknown/unsupported operating system.");
+    }
+    return process;
+}
+
+} // namespace AlphaISA
diff --git a/arch/alpha/process.hh b/arch/alpha/process.hh
new file mode 100644
index 000000000..7b660ddd0
--- /dev/null
+++ b/arch/alpha/process.hh
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2003-2004 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __ALPHA_PROCESS_HH__
+#define __ALPHA_PROCESS_HH__
+
+#include <string>
+
+#include "arch/alpha/linux_process.hh"
+#include "arch/alpha/tru64_process.hh"
+#include "base/loader/object_file.hh"
+
+namespace AlphaISA
+{
+
+LiveProcess *
+createProcess(const std::string &nm, ObjectFile * objFile,
+        int stdin_fd, int stdout_fd, int stderr_fd,
+        std::vector<std::string> &argv, std::vector<std::string> &envp);
+
+} // namespace AlphaISA
+
+#endif // __ALPHA_PROCESS_HH__
diff --git a/arch/mips/process.cc b/arch/mips/process.cc
new file mode 100644
index 000000000..6de44fe9f
--- /dev/null
+++ b/arch/mips/process.cc
@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2003-2004 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "arch/mips/process.hh"
+
+namespace MipsISA
+{
+
+LiveProcess *
+createProcess(const string &nm, ObjectFile * objFile,
+        int stdin_fd, int stdout_fd, int stderr_fd,
+        vector<string> &argv, vector<string> &envp)
+{
+    LiveProcess * process = NULL;
+    if (objFile->getArch() != ObjectFile::MIPS)
+        fatal("Object file does not match architecture.");
+    switch (objFile->getOpSys()) {
+      case ObjectFile::Linux:
+        process = new MipsLinuxProcess(nm, objFile,
+                                        stdin_fd, stdout_fd, stderr_fd,
+                                        argv, envp);
+        break;
+
+      default:
+        fatal("Unknown/unsupported operating system.");
+    }
+    return process;
+}
+
+} // namespace MipsISA
+
diff --git a/arch/mips/process.hh b/arch/mips/process.hh
new file mode 100644
index 000000000..ab4323107
--- /dev/null
+++ b/arch/mips/process.hh
@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2003-2004 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __MIPS_PROCESS_HH__
+#define __MIPS_PROCESS_HH__
+
+#include "arch/mips/linux_process.hh"
+#include "base/loader/object_file.hh"
+
+namespace MipsISA
+{
+
+LiveProcess *
+createProcess(const string &nm, ObjectFile * objFile,
+        int stdin_fd, int stdout_fd, int stderr_fd,
+        vector<string> &argv, vector<string> &envp);
+
+} // namespace MipsISA
+
+#endif // __MIPS_PROCESS_HH__
diff --git a/arch/sparc/process.cc b/arch/sparc/process.cc
new file mode 100644
index 000000000..53a215379
--- /dev/null
+++ b/arch/sparc/process.cc
@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2003-2004 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "arch/sparc/process.hh"
+
+namespace SparcISA
+{
+
+LiveProcess *
+createProcess(const string &nm, ObjectFile * objFile,
+        int stdin_fd, int stdout_fd, int stderr_fd,
+        vector<string> &argv, vector<string> &envp)
+{
+    LiveProcess * process = NULL;
+    if (objFile->getArch() != ObjectFile::SPARC)
+        fatal("Object file does not match architecture.");
+    switch (objFile->getOpSys()) {
+      case ObjectFile::Linux:
+        process = new SparcLinuxProcess(nm, objFile,
+                                        stdin_fd, stdout_fd, stderr_fd,
+                                        argv, envp);
+        break;
+
+      case ObjectFile::Solaris:
+      default:
+        fatal("Unknown/unsupported operating system.");
+    }
+    return process;
+}
+
+} // namespace SparcISA
diff --git a/arch/sparc/process.hh b/arch/sparc/process.hh
new file mode 100644
index 000000000..387649d47
--- /dev/null
+++ b/arch/sparc/process.hh
@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2003-2004 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __SPARC_PROCESS_HH__
+#define __SPARC_PROCESS_HH__
+
+#include "arch/sparc/linux_process.hh"
+#include "base/loader/object_file.hh"
+
+namespace SparcISA
+{
+
+LiveProcess *
+createProcess(const string &nm, ObjectFile * objFile,
+        int stdin_fd, int stdout_fd, int stderr_fd,
+        vector<string> &argv, vector<string> &envp);
+
+} // namespace SparcISA
+
+#endif // __SPARC_PROCESS_HH__
diff --git a/base/loader/elf_object.cc b/base/loader/elf_object.cc
index b74d537af..9dd9f9d00 100644
--- a/base/loader/elf_object.cc
+++ b/base/loader/elf_object.cc
@@ -56,6 +56,8 @@ ElfObject::tryFile(const string &fname, int fd, size_t len, uint8_t *data)
 {
     Elf *elf;
     GElf_Ehdr ehdr;
+    Arch arch = UnknownArch;
+    OpSys opSys = UnknownOpSys;
 
     // check that header matches library version
     if (elf_version(EV_CURRENT) == EV_NONE)
@@ -73,8 +75,8 @@ ElfObject::tryFile(const string &fname, int fd, size_t len, uint8_t *data)
         return NULL;
     }
     else {
-        if (ehdr.e_ident[EI_CLASS] == ELFCLASS32)
-            panic("32 bit ELF Binary, Not Supported");
+//        if (ehdr.e_ident[EI_CLASS] == ELFCLASS32)
+//            panic("32 bit ELF Binary, Not Supported");
         /* @todo this emachine value isn't offical yet.
          *       so we probably shouldn't check it. */
 //        if (ehdr.e_machine != EM_ALPHA)
@@ -82,8 +84,43 @@ ElfObject::tryFile(const string &fname, int fd, size_t len, uint8_t *data)
 
         elf_end(elf);
 
-        return new ElfObject(fname, fd, len, data,
-                             ObjectFile::Alpha, ObjectFile::Linux);
+        //Detect the architecture
+        //Versioning issues in libelf need to be resolved to get the correct
+        //SPARC constants.
+        //If MIPS supports 32 bit executables, this may need to be changed.
+        //Also, there are other MIPS constants which may be used, like
+        //EM_MIPS_RS3_LE and EM_MIPS_X
+        //Since we don't know how to check for alpha right now, we'll
+        //just assume if it wasn't something else and it's 64 bit, that's
+        //what it must be.
+        if (ehdr.e_machine == EM_SPARC64 ||
+                ehdr.e_machine == EM_SPARC ||
+                ehdr.e_machine == EM_SPARCV9) {
+            arch = ObjectFile::SPARC;
+        } else if (ehdr.e_machine == EM_MIPS
+                && ehdr.e_ident[EI_CLASS] == ELFCLASS32) {
+            arch = ObjectFile::MIPS;
+        } else if (ehdr.e_ident[EI_CLASS] == ELFCLASS64) {
+            arch = ObjectFile::Alpha;
+        } else {
+            arch = ObjectFile::UnknownArch;
+        }
+
+        //Detect the operating system
+        switch (ehdr.e_ident[EI_OSABI])
+        {
+          case ELFOSABI_LINUX:
+            opSys = ObjectFile::Linux;
+            break;
+          case ELFOSABI_SOLARIS:
+            opSys = ObjectFile::Solaris;
+          case ELFOSABI_TRU64:
+            opSys = ObjectFile::Tru64;
+          default:
+            opSys = ObjectFile::UnknownOpSys;
+        }
+
+        return new ElfObject(fname, fd, len, data, arch, opSys);
     }
 }
 
diff --git a/base/loader/object_file.hh b/base/loader/object_file.hh
index 3c8659e18..1b44ae14f 100644
--- a/base/loader/object_file.hh
+++ b/base/loader/object_file.hh
@@ -29,7 +29,9 @@
 #ifndef __OBJECT_FILE_HH__
 #define __OBJECT_FILE_HH__
 
-#include "arch/isa_traits.hh"	// for Addr
+#include <string>
+
+#include "sim/host.hh"	// for Addr
 
 class FunctionalMemory;
 class SymbolTable;
@@ -40,13 +42,16 @@ class ObjectFile
 
     enum Arch {
         UnknownArch,
-        Alpha
+        Alpha,
+        SPARC,
+        MIPS
     };
 
     enum OpSys {
         UnknownOpSys,
         Tru64,
-        Linux
+        Linux,
+        Solaris
     };
 
   protected:
diff --git a/sim/process.cc b/sim/process.cc
index e3cae2855..fddd9a0b9 100644
--- a/sim/process.cc
+++ b/sim/process.cc
@@ -48,8 +48,7 @@
 #include "sim/stats.hh"
 #include "sim/syscall_emul.hh"
 
-#include "arch/tru64_process.hh"
-#include "arch/linux_process.hh"
+#include "arch/process.hh"
 
 using namespace std;
 using namespace TheISA;
@@ -376,27 +375,10 @@ LiveProcess::create(const string &nm,
         fatal("Can't load object file %s", executable);
     }
 
-    // check object type & set up syscall emulation pointer
-    if (objFile->getArch() == ObjectFile::Alpha) {
-        switch (objFile->getOpSys()) {
-          case ObjectFile::Tru64:
-            process = new AlphaTru64Process(nm, objFile,
-                                            stdin_fd, stdout_fd, stderr_fd,
-                                            argv, envp);
-            break;
-
-          case ObjectFile::Linux:
-            process = new AlphaLinuxProcess(nm, objFile,
-                                            stdin_fd, stdout_fd, stderr_fd,
-                                            argv, envp);
-            break;
-
-          default:
-            fatal("Unknown/unsupported operating system.");
-        }
-    } else {
-        fatal("Unknown object file architecture.");
-    }
+    // set up syscall emulation pointer for the current ISA
+    process = createProcess(nm, objFile,
+                            stdin_fd, stdout_fd, stderr_fd,
+                            argv, envp);
 
     delete objFile;