New loader structure. Expand Nate's ObjectFile to automatically detect file formats

and generate an appropriate child object, which knows how to load its text & data into memory
(and symbols, for ecoff only at this point).  Ecoff format supports Tru64 binaries, kernel, and
console.  A.out format is used by PAL code.  Elf support is there and appears to work for
Alpha/Linux binaries, but awaits a Linux syscall emulation layer before further testing.

arch/alpha/ecoff_machdep.h:
base/coff_sym.h:
base/coff_symconst.h:
base/exec_ecoff.h:
    Add Id string & provenance comment, clean up types
base/object_file.cc:
base/object_file.hh:
    Add auto format detection and text/data loading.
sim/prog.cc:
    Moved binary loading & stack setup here (was in arch/alpha/loader.cc).  Some of this is
    platform-dependent, but I think most of it is not.  We'll factor out the platform-dependent
    parts when the need arises.
sim/prog.hh:
    Get rid of unused environ_base field.
sim/system.cc:
    Use new ObjectFile loader structure for console, kernel, & palcode.

--HG--
extra : convert_revision : 8eae509bf71cf204bc3ec78c68699cfd01baed97

1 files changed, 83 insertions, 2 deletions

diff --git a/sim/prog.cc b/sim/prog.cc
index 8615cab68..355e8d0a1 100644
--- a/sim/prog.cc
+++ b/sim/prog.cc
@@ -38,7 +38,7 @@
 #include "eio.hh"
 #include "thread.hh"
 #include "fake_syscall.hh"
-#include "loader.hh"
+#include "object_file.hh"
 #include "exec_context.hh"
 #include "smt.hh"
 
@@ -219,12 +219,93 @@ DEFINE_SIM_OBJECT_CLASS_NAME("Process object", Process)
 //
 ////////////////////////////////////////////////////////////////////////
 
+
+static void
+copyStringArray(vector<string> &strings, Addr array_ptr, Addr data_ptr,
+                FunctionalMemory *memory)
+{
+    for (int i = 0; i < strings.size(); ++i) {
+        memory->access(Write, array_ptr, &data_ptr, sizeof(Addr));
+        memory->writeString(data_ptr, strings[i].c_str());
+        array_ptr += sizeof(Addr);
+        data_ptr += strings[i].size() + 1;
+    }
+    // add NULL terminator
+    data_ptr = 0;
+    memory->access(Write, array_ptr, &data_ptr, sizeof(Addr));
+}
+
 LiveProcess::LiveProcess(const string &name,
                          int stdin_fd, int stdout_fd, int stderr_fd,
                          vector<string> &argv, vector<string> &envp)
     : Process(name, stdin_fd, stdout_fd, stderr_fd)
 {
-    smt_load_prog(argv, envp, init_regs, this);
+    prog_fname = argv[0];
+    ObjectFile *objFile = createObjectFile(prog_fname);
+    if (objFile == NULL) {
+        fatal("Can't load object file %s", prog_fname);
+    }
+
+    prog_entry = objFile->entryPoint();
+    text_base = objFile->textBase();
+    text_size = objFile->textSize();
+    data_base = objFile->dataBase();
+    data_size = objFile->dataSize() + objFile->bssSize();
+    brk_point = ROUND_UP(data_base + data_size, VMPageSize);
+
+    // load object file into target memory
+    objFile->loadSections(memory);
+
+    // Set up stack.  On Alpha, stack goes below text section.  This
+    // code should get moved to some architecture-specific spot.
+    stack_base = text_base - (409600+4096);
+
+    // Set pointer for next thread stack.  Reserve 8M for main stack.
+    next_thread_stack_base = stack_base - (8 * 1024 * 1024);
+
+    // Calculate how much space we need for arg & env arrays.
+    int argv_array_size = sizeof(Addr) * (argv.size() + 1);
+    int envp_array_size = sizeof(Addr) * (envp.size() + 1);
+    int arg_data_size = 0;
+    for (int i = 0; i < argv.size(); ++i) {
+        arg_data_size += argv[i].size() + 1;
+    }
+    int env_data_size = 0;
+    for (int i = 0; i < envp.size(); ++i) {
+        env_data_size += envp[i].size() + 1;
+    }
+
+    int space_needed =
+        argv_array_size + envp_array_size + arg_data_size + env_data_size;
+    // for SimpleScalar compatibility
+    if (space_needed < 16384)
+        space_needed = 16384;
+
+    // set bottom of stack
+    stack_min = stack_base - space_needed;
+    // align it
+    stack_min &= ~7;
+    stack_size = stack_base - stack_min;
+
+    // map out initial stack contents
+    Addr argv_array_base = stack_min + sizeof(uint64_t); // room for argc
+    Addr envp_array_base = argv_array_base + argv_array_size;
+    Addr arg_data_base = envp_array_base + envp_array_size;
+    Addr env_data_base = arg_data_base + arg_data_size;
+
+    // write contents to stack
+    uint64_t argc = argv.size();
+    memory->access(Write, stack_min, &argc, sizeof(uint64_t));
+
+    copyStringArray(argv, argv_array_base, arg_data_base, memory);
+    copyStringArray(envp, envp_array_base, env_data_base, memory);
+
+    init_regs->intRegFile[ArgumentReg0] = argc;
+    init_regs->intRegFile[ArgumentReg1] = argv_array_base;
+    init_regs->intRegFile[StackPointerReg] = stack_min;
+    init_regs->intRegFile[GlobalPointerReg] = objFile->globalPointer();
+    init_regs->pc = prog_entry;
+    init_regs->npc = prog_entry + sizeof(MachInst);
 }