infinitesimal small baby steps toward MIPS actually working

arch/mips/isa/formats/branch.isa:
    let user know that we alter r31 in disassembly
arch/mips/isa_traits.cc:
    add copyRegs function ...
    comment out serialize float code for now
arch/mips/isa_traits.hh:
    make FloatRegFile a class ... change values of architectural regs
arch/mips/process.cc:
    change MIPS to Mips
base/loader/elf_object.cc:
    get global pointer initialized to a value
base/loader/elf_object.hh:
    Add global_ptr to elf_object constructor
base/loader/object_file.hh:
    MIPS to Mips
base/traceflags.py:
    SimpleCPU trace flag
cpu/simple/cpu.cc:
    DPRINTF flags for SimpleCPU
cpu/static_inst.hh:
    Add Decoder functions to static_inst.hh

--HG--
extra : convert_revision : 0544a8524d3fe4229428cb06822f7da208c72459

1 files changed, 40 insertions, 3 deletions

diff --git a/base/loader/elf_object.cc b/base/loader/elf_object.cc
index 2925817cd..b9636b454 100644
--- a/base/loader/elf_object.cc
+++ b/base/loader/elf_object.cc
@@ -92,7 +92,7 @@ ElfObject::tryFile(const string &fname, int fd, size_t len, uint8_t *data)
             arch = ObjectFile::SPARC;
         } else if (ehdr.e_machine == EM_MIPS
                 && ehdr.e_ident[EI_CLASS] == ELFCLASS32) {
-            arch = ObjectFile::MIPS;
+            arch = ObjectFile::Mips;
         } else if (ehdr.e_ident[EI_CLASS] == ELFCLASS64) {
             arch = ObjectFile::Alpha;
         } else {
@@ -156,14 +156,49 @@ ElfObject::tryFile(const string &fname, int fd, size_t len, uint8_t *data)
             section = elf_getscn(elf, ++secIdx);
             } // while sections
         }
+
+        int32_t global_ptr;
+        if (arch == ObjectFile::Mips) {
+            Elf_Scn *section;
+            GElf_Shdr shdr;
+            Elf_Data *rdata;
+            int secIdx = 1;
+
+            // Get the first section
+            section = elf_getscn(elf, secIdx);
+
+            // While there are no more sections
+            while (section != NULL) {
+                gelf_getshdr(section, &shdr);
+                /*shdr.sh_type == SHT_MIPS_REGINFO && */
+                if (!strcmp(".reginfo",elf_strptr(elf, ehdr.e_shstrndx, shdr.sh_name))) {
+                    // We have found MIPS reginfo section:
+                    // -------------------------------
+                    // Check the 6th 32bit word for the initialized global pointer value
+                    // -------------------------------
+                    rdata = elf_rawdata(section, NULL);
+                    assert(rdata->d_buf);
+
+                    if(ehdr.e_ident[EI_DATA] == ELFDATA2LSB)
+                        global_ptr = htole(((int32_t*)rdata->d_buf)[5]);
+                    else
+                        global_ptr = htobe(((int32_t*)rdata->d_buf)[5]);
+                    break;
+                }
+
+                section = elf_getscn(elf, ++secIdx);
+            } // if section found
+
+        }
+
         elf_end(elf);
-        return new ElfObject(fname, fd, len, data, arch, opSys);
+        return new ElfObject(fname, fd, len, data, global_ptr,arch, opSys);
     }
 }
 
 
 ElfObject::ElfObject(const string &_filename, int _fd,
-                     size_t _len, uint8_t *_data,
+                     size_t _len, uint8_t *_data,Addr global_ptr,
                      Arch _arch, OpSys _opSys)
     : ObjectFile(_filename, _fd, _len, _data, _arch, _opSys)
 
@@ -187,6 +222,8 @@ ElfObject::ElfObject(const string &_filename, int _fd,
 
     entry = ehdr.e_entry;
 
+    globalPtr = global_ptr;
+
     // initialize segment sizes to 0 in case they're not present
     text.size = data.size = bss.size = 0;