This brings M5 closer to modernity - the kernel being advertised is newer so it won't die on binaries compiled with newer glibc's, and enables use of TLS-toolchain built binaries for ALPHA_SE by putting auxiliary vectors on the stack. There are some comments in the code to help. Finally, stats changes for ALPHA are from slight perturbations to the initial stack frame, all minimal diffs.

1 files changed, 118 insertions, 0 deletions

diff --git a/src/arch/alpha/process.cc b/src/arch/alpha/process.cc
index 28e8df308..3e5851e74 100644
--- a/src/arch/alpha/process.cc
+++ b/src/arch/alpha/process.cc
@@ -32,8 +32,11 @@
 #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;
@@ -60,11 +63,126 @@ AlphaLiveProcess::AlphaLiveProcess(LiveProcessParams *params,
 }
 
 void
+AlphaLiveProcess::argsInit(int intSize, int pageSize)
+{
+    objFile->loadSections(initVirtMem);
+
+    typedef M5_auxv_t<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);
+    }
+
+    assert(NumArgumentRegs >= 2);
+
+    ThreadContext *tc = system->getThreadContext(contextIds[0]);
+
+    tc->setIntReg(ArgumentReg[0], argc);
+    tc->setIntReg(ArgumentReg[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);
 
     ThreadContext *tc = system->getThreadContext(contextIds[0]);