1 files changed, 157 insertions, 8 deletions

diff --git a/src/arch/alpha/process.cc b/src/arch/alpha/process.cc
index c2d23ecdd..9c6e62815 100644
--- a/src/arch/alpha/process.cc
+++ b/src/arch/alpha/process.cc
@@ -32,16 +32,20 @@
 #include "arch/alpha/isa_traits.hh"
 #include "arch/alpha/process.hh"
 #include "base/loader/object_file.hh"
+#include "base/loader/elf_object.hh"
 #include "base/misc.hh"
 #include "cpu/thread_context.hh"
+#include "mem/page_table.hh"
+#include "sim/process_impl.hh"
 #include "sim/system.hh"
 
-
 using namespace AlphaISA;
 using namespace std;
 
-AlphaLiveProcess::AlphaLiveProcess(LiveProcessParams * params,
-        ObjectFile *objFile)
+static const int SyscallSuccessReg = 19;
+
+AlphaLiveProcess::AlphaLiveProcess(LiveProcessParams *params,
+                                   ObjectFile *objFile)
     : LiveProcess(params, objFile)
 {
     brk_point = objFile->dataBase() + objFile->dataSize() + objFile->bssSize();
@@ -61,20 +65,165 @@ AlphaLiveProcess::AlphaLiveProcess(LiveProcessParams * params,
 }
 
 void
+AlphaLiveProcess::argsInit(int intSize, int pageSize)
+{
+    objFile->loadSections(initVirtMem);
+
+    typedef AuxVector<uint64_t> auxv_t;
+    std::vector<auxv_t>  auxv;
+
+    ElfObject * elfObject = dynamic_cast<ElfObject *>(objFile);
+    if(elfObject)
+    {
+        // modern glibc uses a bunch of auxiliary vectors to set up 
+        // TLS as well as do a bunch of other stuff
+        // these vectors go on the bottom of the stack, below argc/argv/envp
+        // pointers but above actual arg strings
+        // I don't have all the ones glibc looks at here, but so far it doesn't
+        // seem to be a problem.
+        // check out _dl_aux_init() in glibc/elf/dl-support.c for details
+        // --Lisa
+        auxv.push_back(auxv_t(M5_AT_PAGESZ, AlphaISA::VMPageSize));
+        auxv.push_back(auxv_t(M5_AT_CLKTCK, 100));
+        auxv.push_back(auxv_t(M5_AT_PHDR, elfObject->programHeaderTable()));
+        DPRINTF(Loader, "auxv at PHDR %08p\n", elfObject->programHeaderTable());
+        auxv.push_back(auxv_t(M5_AT_PHNUM, elfObject->programHeaderCount()));
+        auxv.push_back(auxv_t(M5_AT_ENTRY, objFile->entryPoint()));
+        auxv.push_back(auxv_t(M5_AT_UID, uid()));
+        auxv.push_back(auxv_t(M5_AT_EUID, euid()));
+        auxv.push_back(auxv_t(M5_AT_GID, gid()));
+        auxv.push_back(auxv_t(M5_AT_EGID, egid()));
+
+    }
+
+    // Calculate how much space we need for arg & env & auxv arrays.
+    int argv_array_size = intSize * (argv.size() + 1);
+    int envp_array_size = intSize * (envp.size() + 1);
+    int auxv_array_size = intSize * 2 * (auxv.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 + 
+        auxv_array_size +
+        arg_data_size + 
+        env_data_size;
+
+    if (space_needed < 32*1024)
+        space_needed = 32*1024;
+
+    // set bottom of stack
+    stack_min = stack_base - space_needed;
+    // align it
+    stack_min = roundDown(stack_min, pageSize);
+    stack_size = stack_base - stack_min;
+    // map memory
+    pTable->allocate(stack_min, roundUp(stack_size, pageSize));
+
+    // map out initial stack contents
+    Addr argv_array_base = stack_min + intSize; // room for argc
+    Addr envp_array_base = argv_array_base + argv_array_size;
+    Addr auxv_array_base = envp_array_base + envp_array_size;
+    Addr arg_data_base = auxv_array_base + auxv_array_size;
+    Addr env_data_base = arg_data_base + arg_data_size;
+
+    // write contents to stack
+    uint64_t argc = argv.size();
+    if (intSize == 8)
+        argc = htog((uint64_t)argc);
+    else if (intSize == 4)
+        argc = htog((uint32_t)argc);
+    else
+        panic("Unknown int size");
+
+    initVirtMem->writeBlob(stack_min, (uint8_t*)&argc, intSize);
+
+    copyStringArray(argv, argv_array_base, arg_data_base, initVirtMem);
+    copyStringArray(envp, envp_array_base, env_data_base, initVirtMem);
+
+    //Copy the aux stuff
+    for(int x = 0; x < auxv.size(); x++)
+    {
+        initVirtMem->writeBlob(auxv_array_base + x * 2 * intSize,
+                (uint8_t*)&(auxv[x].a_type), intSize);
+        initVirtMem->writeBlob(auxv_array_base + (x * 2 + 1) * intSize,
+                (uint8_t*)&(auxv[x].a_val), intSize);
+    }
+
+    ThreadContext *tc = system->getThreadContext(contextIds[0]);
+
+    setSyscallArg(tc, 0, argc);
+    setSyscallArg(tc, 1, argv_array_base);
+    tc->setIntReg(StackPointerReg, stack_min);
+
+    Addr prog_entry = objFile->entryPoint();
+    tc->setPC(prog_entry);
+    tc->setNextPC(prog_entry + sizeof(MachInst));
+
+#if THE_ISA != ALPHA_ISA //e.g. MIPS or Sparc
+    tc->setNextNPC(prog_entry + (2 * sizeof(MachInst)));
+#endif
+
+
+}
+
+void
 AlphaLiveProcess::startup()
 {
     if (checkpointRestored)
         return;
 
+    Process::startup();
+
     argsInit(MachineBytes, VMPageSize);
 
-    threadContexts[0]->setIntReg(GlobalPointerReg, objFile->globalPointer());
-    //Opperate in user mode
-    threadContexts[0]->setMiscRegNoEffect(IPR_ICM, 0x18);
+    ThreadContext *tc = system->getThreadContext(contextIds[0]);
+    tc->setIntReg(GlobalPointerReg, objFile->globalPointer());
+    //Operate in user mode
+    tc->setMiscRegNoEffect(IPR_ICM, 0x18);
     //No super page mapping
-    threadContexts[0]->setMiscRegNoEffect(IPR_MCSR, 0);
+    tc->setMiscRegNoEffect(IPR_MCSR, 0);
     //Set this to 0 for now, but it should be unique for each process
-    threadContexts[0]->setMiscRegNoEffect(IPR_DTB_ASN, M5_pid << 57);
+    tc->setMiscRegNoEffect(IPR_DTB_ASN, M5_pid << 57);
 }
 
+AlphaISA::IntReg
+AlphaLiveProcess::getSyscallArg(ThreadContext *tc, int i)
+{
+    assert(i < 6);
+    return tc->readIntReg(FirstArgumentReg + i);
+}
+
+void
+AlphaLiveProcess::setSyscallArg(ThreadContext *tc,
+        int i, AlphaISA::IntReg val)
+{
+    assert(i < 6);
+    tc->setIntReg(FirstArgumentReg + i, val);
+}
 
+void
+AlphaLiveProcess::setSyscallReturn(ThreadContext *tc,
+        SyscallReturn return_value)
+{
+    // check for error condition.  Alpha syscall convention is to
+    // indicate success/failure in reg a3 (r19) and put the
+    // return value itself in the standard return value reg (v0).
+    if (return_value.successful()) {
+        // no error
+        tc->setIntReg(SyscallSuccessReg, 0);
+        tc->setIntReg(ReturnValueReg, return_value.value());
+    } else {
+        // got an error, return details
+        tc->setIntReg(SyscallSuccessReg, (IntReg)-1);
+        tc->setIntReg(ReturnValueReg, -return_value.value());
+    }
+}