Get X86 to load an elf and start a process for it.

src/arch/x86/SConscript:
    Add in process source files.
src/arch/x86/isa_traits.hh:
    Replace magic constant numbers with the x86 register names.
src/arch/x86/miscregfile.cc:
    Make clear the miscreg file succeed. There aren't any misc regs, so clearing them is very easy.
src/arch/x86/process.hh:
    An X86 process class.
src/base/loader/elf_object.cc:
    Add in code to recognize x86 as an architecture.
src/base/traceflags.py:
    Add an x86 traceflag
src/sim/process.cc:
    Add in code to create an x86 process.
src/arch/x86/intregs.hh:
    A file which declares names for the integer register indices.
src/arch/x86/linux/linux.cc:
src/arch/x86/linux/linux.hh:
    A very simple translation of SPARC's linux.cc and linux.hh. It's probably not correct for x86, but it might not be correct for SPARC either.
src/arch/x86/linux/process.cc:
src/arch/x86/linux/process.hh:
    An x86 linux process. The syscall table is split out into it's own file.
src/arch/x86/linux/syscalls.cc:
    The x86 Linux syscall table and the uname function.
src/arch/x86/process.cc:
    The x86 process base class.
tests/test-progs/hello/bin/x86/linux/hello:
    An x86 hello world test binary.

--HG--
extra : convert_revision : f22919e010c07aeaf5757dca054d9877a537fd08

src/base/loader/elf_object.cc

@@ -89,6 +89,12 @@ ElfObject::tryFile(const string &fname, int fd, size_t len, uint8_t *data)
         } else if (ehdr.e_machine == EM_MIPS
                 && ehdr.e_ident[EI_CLASS] == ELFCLASS32) {
             arch = ObjectFile::Mips;
+        } else if (ehdr.e_machine == EM_X86_64 &&
+                ehdr.e_ident[EI_CLASS] == ELFCLASS64) {
+            //In the future, we might want to differentiate between 32 bit
+            //and 64 bit x86 processes in case there are differences in their
+            //initial stack frame.
+            arch = ObjectFile::X86;
         } else if (ehdr.e_ident[EI_CLASS] == ELFCLASS64) {
             arch = ObjectFile::Alpha;
         } else {

src/base/traceflags.py

@@ -168,6 +168,7 @@ baseFlags = [
     'VtoPhys',
     'WriteBarrier',
     'Writeback',
+    'X86',
     ]
 
 #