Make trap instructions always generate TrapInstruction Fault objects which call into the Process object to handle system calls. Refactored the Process objects, and move the handler code into it's own file, and add some syscalls which are used in a natively compiled hello world. Software traps with trap number 3 (not syscall number 3) are supposed to cause the register windows to be flushed but are ignored right now. Finally, made uname for SPARC report a 2.6.12 kernel which is what m22-018.pool happens to be running.

--HG--
extra : convert_revision : ea873f01c62234c0542f310cc143c6a7c76ade94

1 files changed, 318 insertions, 106 deletions

diff --git a/src/arch/sparc/process.cc b/src/arch/sparc/process.cc
index 1e639b9a5..d5a95e0c0 100644
--- a/src/arch/sparc/process.cc
+++ b/src/arch/sparc/process.cc
@@ -30,6 +30,7 @@
  */
 
 #include "arch/sparc/asi.hh"
+#include "arch/sparc/handlers.hh"
 #include "arch/sparc/isa_traits.hh"
 #include "arch/sparc/process.hh"
 #include "arch/sparc/types.hh"
@@ -59,14 +60,6 @@ SparcLiveProcess::SparcLiveProcess(const std::string &nm, ObjectFile *objFile,
     brk_point = objFile->dataBase() + objFile->dataSize() + objFile->bssSize();
     brk_point = roundUp(brk_point, VMPageSize);
 
-    // Set up stack. On SPARC Linux, stack goes from the top of memory
-    // downward, less the hole for the kernel address space.
-    stack_base = (Addr)0x80000000000ULL;
-
-    // Set up region for mmaps.  Tru64 seems to start just above 0 and
-    // grow up from there.
-    mmap_start = mmap_end = 0xfffff80000000000ULL;
-
     // Set pointer for next thread stack.  Reserve 8M for main stack.
     next_thread_stack_base = stack_base - (8 * 1024 * 1024);
 
@@ -75,10 +68,22 @@ SparcLiveProcess::SparcLiveProcess(const std::string &nm, ObjectFile *objFile,
     spillStart = 0;
 }
 
+void SparcLiveProcess::handleTrap(int trapNum, ThreadContext *tc)
+{
+    switch(trapNum)
+    {
+      case 0x03: //Flush window trap
+        warn("Ignoring request to flush register windows.\n");
+        break;
+      default:
+        panic("Unimplemented trap to operating system: trap number %#x.\n", trapNum);
+    }
+}
+
 void
-SparcLiveProcess::startup()
+Sparc32LiveProcess::startup()
 {
-    argsInit(sizeof(IntReg), VMPageSize);
+    argsInit(32 / 8, VMPageSize);
 
     //From the SPARC ABI
 
@@ -117,94 +122,64 @@ SparcLiveProcess::startup()
     threadContexts[0]->setMiscReg(MISCREG_ASI, ASI_PRIMARY);
 }
 
-m5_auxv_t buildAuxVect(int64_t type, int64_t val)
+void
+Sparc64LiveProcess::startup()
 {
-    m5_auxv_t result;
-    result.a_type = TheISA::htog(type);
-    result.a_val = TheISA::htog(val);
-    return result;
-}
+    argsInit(sizeof(IntReg), VMPageSize);
+
+    //From the SPARC ABI
 
-//We only use 19 instructions for the trap handlers, but there would be
-//space for 32 in a real SPARC trap table.
-const int numFillInsts = 32;
-const int numSpillInsts = 32;
+    //The process runs in user mode
+    threadContexts[0]->setMiscRegWithEffect(MISCREG_PSTATE, 0x02);
+
+    //Setup default FP state
+    threadContexts[0]->setMiscReg(MISCREG_FSR, 0);
+
+    threadContexts[0]->setMiscReg(MISCREG_TICK, 0);
+    //
+    /*
+     * Register window management registers
+     */
+
+    //No windows contain info from other programs
+    //threadContexts[0]->setMiscReg(MISCREG_OTHERWIN, 0);
+    threadContexts[0]->setIntReg(NumIntArchRegs + 6, 0);
+    //There are no windows to pop
+    //threadContexts[0]->setMiscReg(MISCREG_CANRESTORE, 0);
+    threadContexts[0]->setIntReg(NumIntArchRegs + 4, 0);
+    //All windows are available to save into
+    //threadContexts[0]->setMiscReg(MISCREG_CANSAVE, NWindows - 2);
+    threadContexts[0]->setIntReg(NumIntArchRegs + 3, NWindows - 2);
+    //All windows are "clean"
+    //threadContexts[0]->setMiscReg(MISCREG_CLEANWIN, NWindows);
+    threadContexts[0]->setIntReg(NumIntArchRegs + 5, NWindows);
+    //Start with register window 0
+    threadContexts[0]->setMiscReg(MISCREG_CWP, 0);
+    //Always use spill and fill traps 0
+    //threadContexts[0]->setMiscReg(MISCREG_WSTATE, 0);
+    threadContexts[0]->setIntReg(NumIntArchRegs + 7, 0);
+    //Set the trap level to 0
+    threadContexts[0]->setMiscReg(MISCREG_TL, 0);
+    //Set the ASI register to something fixed
+    threadContexts[0]->setMiscReg(MISCREG_ASI, ASI_PRIMARY);
+}
 
-MachInst fillHandler[numFillInsts] =
+M5_32_auxv_t::M5_32_auxv_t(int32_t type, int32_t val)
 {
-    htog(0x87802018), //wr %g0, ASI_AIUP, %asi
-    htog(0xe0dba7ff), //ldxa [%sp + BIAS + (0*8)] %asi, %l0
-    htog(0xe2dba807), //ldxa [%sp + BIAS + (1*8)] %asi, %l1
-    htog(0xe4dba80f), //ldxa [%sp + BIAS + (2*8)] %asi, %l2
-    htog(0xe6dba817), //ldxa [%sp + BIAS + (3*8)] %asi, %l3
-    htog(0xe8dba81f), //ldxa [%sp + BIAS + (4*8)] %asi, %l4
-    htog(0xeadba827), //ldxa [%sp + BIAS + (5*8)] %asi, %l5
-    htog(0xecdba82f), //ldxa [%sp + BIAS + (6*8)] %asi, %l6
-    htog(0xeedba837), //ldxa [%sp + BIAS + (7*8)] %asi, %l7
-    htog(0xf0dba83f), //ldxa [%sp + BIAS + (8*8)] %asi, %i0
-    htog(0xf2dba847), //ldxa [%sp + BIAS + (9*8)] %asi, %i1
-    htog(0xf4dba84f), //ldxa [%sp + BIAS + (10*8)] %asi, %i2
-    htog(0xf6dba857), //ldxa [%sp + BIAS + (11*8)] %asi, %i3
-    htog(0xf8dba85f), //ldxa [%sp + BIAS + (12*8)] %asi, %i4
-    htog(0xfadba867), //ldxa [%sp + BIAS + (13*8)] %asi, %i5
-    htog(0xfcdba86f), //ldxa [%sp + BIAS + (14*8)] %asi, %i6
-    htog(0xfedba877), //ldxa [%sp + BIAS + (15*8)] %asi, %i7
-    htog(0x83880000), //restored
-    htog(0x83F00000), //retry
-    htog(0x00000000), //illtrap
-    htog(0x00000000), //illtrap
-    htog(0x00000000), //illtrap
-    htog(0x00000000), //illtrap
-    htog(0x00000000), //illtrap
-    htog(0x00000000), //illtrap
-    htog(0x00000000), //illtrap
-    htog(0x00000000), //illtrap
-    htog(0x00000000), //illtrap
-    htog(0x00000000), //illtrap
-    htog(0x00000000), //illtrap
-    htog(0x00000000), //illtrap
-    htog(0x00000000)  //illtrap
-};
-
-MachInst spillHandler[numSpillInsts] =
+    a_type = TheISA::htog(type);
+    a_val = TheISA::htog(val);
+}
+
+M5_64_auxv_t::M5_64_auxv_t(int64_t type, int64_t val)
 {
-    htog(0x87802018), //wr %g0, ASI_AIUP, %asi
-    htog(0xe0f3a7ff), //stxa %l0, [%sp + BIAS + (0*8)] %asi
-    htog(0xe2f3a807), //stxa %l1, [%sp + BIAS + (1*8)] %asi
-    htog(0xe4f3a80f), //stxa %l2, [%sp + BIAS + (2*8)] %asi
-    htog(0xe6f3a817), //stxa %l3, [%sp + BIAS + (3*8)] %asi
-    htog(0xe8f3a81f), //stxa %l4, [%sp + BIAS + (4*8)] %asi
-    htog(0xeaf3a827), //stxa %l5, [%sp + BIAS + (5*8)] %asi
-    htog(0xecf3a82f), //stxa %l6, [%sp + BIAS + (6*8)] %asi
-    htog(0xeef3a837), //stxa %l7, [%sp + BIAS + (7*8)] %asi
-    htog(0xf0f3a83f), //stxa %i0, [%sp + BIAS + (8*8)] %asi
-    htog(0xf2f3a847), //stxa %i1, [%sp + BIAS + (9*8)] %asi
-    htog(0xf4f3a84f), //stxa %i2, [%sp + BIAS + (10*8)] %asi
-    htog(0xf6f3a857), //stxa %i3, [%sp + BIAS + (11*8)] %asi
-    htog(0xf8f3a85f), //stxa %i4, [%sp + BIAS + (12*8)] %asi
-    htog(0xfaf3a867), //stxa %i5, [%sp + BIAS + (13*8)] %asi
-    htog(0xfcf3a86f), //stxa %i6, [%sp + BIAS + (14*8)] %asi
-    htog(0xfef3a877), //stxa %i7, [%sp + BIAS + (15*8)] %asi
-    htog(0x81880000), //saved
-    htog(0x83F00000), //retry
-    htog(0x00000000), //illtrap
-    htog(0x00000000), //illtrap
-    htog(0x00000000), //illtrap
-    htog(0x00000000), //illtrap
-    htog(0x00000000), //illtrap
-    htog(0x00000000), //illtrap
-    htog(0x00000000), //illtrap
-    htog(0x00000000), //illtrap
-    htog(0x00000000), //illtrap
-    htog(0x00000000), //illtrap
-    htog(0x00000000), //illtrap
-    htog(0x00000000), //illtrap
-    htog(0x00000000)  //illtrap
-};
+    a_type = TheISA::htog(type);
+    a_val = TheISA::htog(val);
+}
 
 void
-SparcLiveProcess::argsInit(int intSize, int pageSize)
+Sparc64LiveProcess::argsInit(int intSize, int pageSize)
 {
+    typedef M5_64_auxv_t auxv_t;
     Process::startup();
 
     string filename;
@@ -265,34 +240,34 @@ SparcLiveProcess::argsInit(int intSize, int pageSize)
     if(elfObject)
     {
         //Bits which describe the system hardware capabilities
-        auxv.push_back(buildAuxVect(SPARC_AT_HWCAP, hwcap));
+        auxv.push_back(auxv_t(SPARC_AT_HWCAP, hwcap));
         //The system page size
-        auxv.push_back(buildAuxVect(SPARC_AT_PAGESZ, SparcISA::VMPageSize));
+        auxv.push_back(auxv_t(SPARC_AT_PAGESZ, SparcISA::VMPageSize));
         //Defined to be 100 in the kernel source.
         //Frequency at which times() increments
-        auxv.push_back(buildAuxVect(SPARC_AT_CLKTCK, 100));
+        auxv.push_back(auxv_t(SPARC_AT_CLKTCK, 100));
         // For statically linked executables, this is the virtual address of the
         // program header tables if they appear in the executable image
-        auxv.push_back(buildAuxVect(SPARC_AT_PHDR, elfObject->programHeaderTable()));
+        auxv.push_back(auxv_t(SPARC_AT_PHDR, elfObject->programHeaderTable()));
         // This is the size of a program header entry from the elf file.
-        auxv.push_back(buildAuxVect(SPARC_AT_PHENT, elfObject->programHeaderSize()));
+        auxv.push_back(auxv_t(SPARC_AT_PHENT, elfObject->programHeaderSize()));
         // This is the number of program headers from the original elf file.
-        auxv.push_back(buildAuxVect(SPARC_AT_PHNUM, elfObject->programHeaderCount()));
+        auxv.push_back(auxv_t(SPARC_AT_PHNUM, elfObject->programHeaderCount()));
         //This is the address of the elf "interpreter", It should be set
         //to 0 for regular executables. It should be something else
         //(not sure what) for dynamic libraries.
-        auxv.push_back(buildAuxVect(SPARC_AT_BASE, 0));
+        auxv.push_back(auxv_t(SPARC_AT_BASE, 0));
         //This is hardwired to 0 in the elf loading code in the kernel
-        auxv.push_back(buildAuxVect(SPARC_AT_FLAGS, 0));
+        auxv.push_back(auxv_t(SPARC_AT_FLAGS, 0));
         //The entry point to the program
-        auxv.push_back(buildAuxVect(SPARC_AT_ENTRY, objFile->entryPoint()));
+        auxv.push_back(auxv_t(SPARC_AT_ENTRY, objFile->entryPoint()));
         //Different user and group IDs
-        auxv.push_back(buildAuxVect(SPARC_AT_UID, uid()));
-        auxv.push_back(buildAuxVect(SPARC_AT_EUID, euid()));
-        auxv.push_back(buildAuxVect(SPARC_AT_GID, gid()));
-        auxv.push_back(buildAuxVect(SPARC_AT_EGID, egid()));
+        auxv.push_back(auxv_t(SPARC_AT_UID, uid()));
+        auxv.push_back(auxv_t(SPARC_AT_EUID, euid()));
+        auxv.push_back(auxv_t(SPARC_AT_GID, gid()));
+        auxv.push_back(auxv_t(SPARC_AT_EGID, egid()));
         //Whether to enable "secure mode" in the executable
-        auxv.push_back(buildAuxVect(SPARC_AT_SECURE, 0));
+        auxv.push_back(auxv_t(SPARC_AT_SECURE, 0));
     }
 
     //Figure out how big the initial stack needs to be
@@ -419,8 +394,8 @@ SparcLiveProcess::argsInit(int intSize, int pageSize)
     int spillSize = sizeof(MachInst) * numSpillInsts;
     fillStart = stack_base;
     spillStart = fillStart + fillSize;
-    initVirtMem->writeBlob(fillStart, (uint8_t*)fillHandler, fillSize);
-    initVirtMem->writeBlob(spillStart, (uint8_t*)spillHandler, spillSize);
+    initVirtMem->writeBlob(fillStart, (uint8_t*)fillHandler64, fillSize);
+    initVirtMem->writeBlob(spillStart, (uint8_t*)spillHandler64, spillSize);
 
     //Set up the thread context to start running the process
     threadContexts[0]->setIntReg(ArgumentReg0, argc);
@@ -437,3 +412,240 @@ SparcLiveProcess::argsInit(int intSize, int pageSize)
 
 //    num_processes++;
 }
+
+void
+Sparc32LiveProcess::argsInit(int intSize, int pageSize)
+{
+    typedef M5_32_auxv_t auxv_t;
+    Process::startup();
+
+    string filename;
+    if(argv.size() < 1)
+        filename = "";
+    else
+        filename = argv[0];
+
+    Addr alignmentMask = ~(intSize - 1);
+
+    // load object file into target memory
+    objFile->loadSections(initVirtMem);
+
+    //These are the auxilliary vector types
+    enum auxTypes
+    {
+        SPARC_AT_HWCAP = 16,
+        SPARC_AT_PAGESZ = 6,
+        SPARC_AT_CLKTCK = 17,
+        SPARC_AT_PHDR = 3,
+        SPARC_AT_PHENT = 4,
+        SPARC_AT_PHNUM = 5,
+        SPARC_AT_BASE = 7,
+        SPARC_AT_FLAGS = 8,
+        SPARC_AT_ENTRY = 9,
+        SPARC_AT_UID = 11,
+        SPARC_AT_EUID = 12,
+        SPARC_AT_GID = 13,
+        SPARC_AT_EGID = 14,
+        SPARC_AT_SECURE = 23
+    };
+
+    enum hardwareCaps
+    {
+        M5_HWCAP_SPARC_FLUSH = 1,
+        M5_HWCAP_SPARC_STBAR = 2,
+        M5_HWCAP_SPARC_SWAP = 4,
+        M5_HWCAP_SPARC_MULDIV = 8,
+        M5_HWCAP_SPARC_V9 = 16,
+        //This one should technically only be set
+        //if there is a cheetah or cheetah_plus tlb,
+        //but we'll use it all the time
+        M5_HWCAP_SPARC_ULTRA3 = 32
+    };
+
+    const int64_t hwcap =
+        M5_HWCAP_SPARC_FLUSH |
+        M5_HWCAP_SPARC_STBAR |
+        M5_HWCAP_SPARC_SWAP |
+        M5_HWCAP_SPARC_MULDIV |
+        M5_HWCAP_SPARC_V9 |
+        M5_HWCAP_SPARC_ULTRA3;
+
+
+    //Setup the auxilliary vectors. These will already have endian conversion.
+    //Auxilliary vectors are loaded only for elf formatted executables.
+    ElfObject * elfObject = dynamic_cast<ElfObject *>(objFile);
+    if(elfObject)
+    {
+        //Bits which describe the system hardware capabilities
+        auxv.push_back(auxv_t(SPARC_AT_HWCAP, hwcap));
+        //The system page size
+        auxv.push_back(auxv_t(SPARC_AT_PAGESZ, SparcISA::VMPageSize));
+        //Defined to be 100 in the kernel source.
+        //Frequency at which times() increments
+        auxv.push_back(auxv_t(SPARC_AT_CLKTCK, 100));
+        // For statically linked executables, this is the virtual address of the
+        // program header tables if they appear in the executable image
+        auxv.push_back(auxv_t(SPARC_AT_PHDR, elfObject->programHeaderTable()));
+        // This is the size of a program header entry from the elf file.
+        auxv.push_back(auxv_t(SPARC_AT_PHENT, elfObject->programHeaderSize()));
+        // This is the number of program headers from the original elf file.
+        auxv.push_back(auxv_t(SPARC_AT_PHNUM, elfObject->programHeaderCount()));
+        //This is the address of the elf "interpreter", It should be set
+        //to 0 for regular executables. It should be something else
+        //(not sure what) for dynamic libraries.
+        auxv.push_back(auxv_t(SPARC_AT_BASE, 0));
+        //This is hardwired to 0 in the elf loading code in the kernel
+        auxv.push_back(auxv_t(SPARC_AT_FLAGS, 0));
+        //The entry point to the program
+        auxv.push_back(auxv_t(SPARC_AT_ENTRY, objFile->entryPoint()));
+        //Different user and group IDs
+        auxv.push_back(auxv_t(SPARC_AT_UID, uid()));
+        auxv.push_back(auxv_t(SPARC_AT_EUID, euid()));
+        auxv.push_back(auxv_t(SPARC_AT_GID, gid()));
+        auxv.push_back(auxv_t(SPARC_AT_EGID, egid()));
+        //Whether to enable "secure mode" in the executable
+        auxv.push_back(auxv_t(SPARC_AT_SECURE, 0));
+    }
+
+    //Figure out how big the initial stack needs to be
+
+    // The unaccounted for 0 at the top of the stack
+    int mysterious_size = intSize;
+
+    //This is the name of the file which is present on the initial stack
+    //It's purpose is to let the user space linker examine the original file.
+    int file_name_size = filename.size() + 1;
+
+    int env_data_size = 0;
+    for (int i = 0; i < envp.size(); ++i) {
+        env_data_size += envp[i].size() + 1;
+    }
+    int arg_data_size = 0;
+    for (int i = 0; i < argv.size(); ++i) {
+        arg_data_size += argv[i].size() + 1;
+    }
+
+    //The info_block needs to be padded so it's size is a multiple of the
+    //alignment mask. Also, it appears that there needs to be at least some
+    //padding, so if the size is already a multiple, we need to increase it
+    //anyway.
+    int info_block_size =
+        (file_name_size +
+        env_data_size +
+        arg_data_size +
+        intSize) & alignmentMask;
+
+    int info_block_padding =
+        info_block_size -
+        file_name_size -
+        env_data_size -
+        arg_data_size;
+
+    //Each auxilliary vector is two 8 byte words
+    int aux_array_size = intSize * 2 * (auxv.size() + 1);
+
+    int envp_array_size = intSize * (envp.size() + 1);
+    int argv_array_size = intSize * (argv.size() + 1);
+
+    int argc_size = intSize;
+    int window_save_size = intSize * 16;
+
+    int space_needed =
+        mysterious_size +
+        info_block_size +
+        aux_array_size +
+        envp_array_size +
+        argv_array_size +
+        argc_size +
+        window_save_size;
+
+    stack_min = stack_base - space_needed;
+    stack_min &= alignmentMask;
+    stack_size = stack_base - stack_min;
+
+    // map memory
+    pTable->allocate(roundDown(stack_min, pageSize),
+                     roundUp(stack_size, pageSize));
+
+    // map out initial stack contents
+    Addr mysterious_base = stack_base - mysterious_size;
+    Addr file_name_base = mysterious_base - file_name_size;
+    Addr env_data_base = file_name_base - env_data_size;
+    Addr arg_data_base = env_data_base - arg_data_size;
+    Addr auxv_array_base = arg_data_base - aux_array_size - info_block_padding;
+    Addr envp_array_base = auxv_array_base - envp_array_size;
+    Addr argv_array_base = envp_array_base - argv_array_size;
+    Addr argc_base = argv_array_base - argc_size;
+#ifndef NDEBUG
+    // only used in DPRINTF
+    Addr window_save_base = argc_base - window_save_size;
+#endif
+
+    DPRINTF(Sparc, "The addresses of items on the initial stack:\n");
+    DPRINTF(Sparc, "0x%x - file name\n", file_name_base);
+    DPRINTF(Sparc, "0x%x - env data\n", env_data_base);
+    DPRINTF(Sparc, "0x%x - arg data\n", arg_data_base);
+    DPRINTF(Sparc, "0x%x - auxv array\n", auxv_array_base);
+    DPRINTF(Sparc, "0x%x - envp array\n", envp_array_base);
+    DPRINTF(Sparc, "0x%x - argv array\n", argv_array_base);
+    DPRINTF(Sparc, "0x%x - argc \n", argc_base);
+    DPRINTF(Sparc, "0x%x - window save\n", window_save_base);
+    DPRINTF(Sparc, "0x%x - stack min\n", stack_min);
+
+    // write contents to stack
+
+    // figure out argc
+    uint32_t argc = argv.size();
+    uint32_t guestArgc = TheISA::htog(argc);
+
+    //Write out the mysterious 0
+    uint64_t mysterious_zero = 0;
+    initVirtMem->writeBlob(mysterious_base,
+            (uint8_t*)&mysterious_zero, mysterious_size);
+
+    //Write the file name
+    initVirtMem->writeString(file_name_base, filename.c_str());
+
+    //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);
+    }
+    //Write out the terminating zeroed auxilliary vector
+    const uint64_t zero = 0;
+    initVirtMem->writeBlob(auxv_array_base + 2 * intSize * auxv.size(),
+            (uint8_t*)&zero, 2 * intSize);
+
+    copyStringArray(envp, envp_array_base, env_data_base, initVirtMem, intSize);
+    copyStringArray(argv, argv_array_base, arg_data_base, initVirtMem, intSize);
+
+    initVirtMem->writeBlob(argc_base, (uint8_t*)&guestArgc, intSize);
+
+    //Stuff the trap handlers into the processes address space.
+    //Since the stack grows down and is the highest area in the processes
+    //address space, we can put stuff above it and stay out of the way.
+    int fillSize = sizeof(MachInst) * numFillInsts;
+    int spillSize = sizeof(MachInst) * numSpillInsts;
+    fillStart = stack_base;
+    spillStart = fillStart + fillSize;
+    initVirtMem->writeBlob(fillStart, (uint8_t*)fillHandler32, fillSize);
+    initVirtMem->writeBlob(spillStart, (uint8_t*)spillHandler32, spillSize);
+
+    //Set up the thread context to start running the process
+    threadContexts[0]->setIntReg(ArgumentReg0, argc);
+    threadContexts[0]->setIntReg(ArgumentReg1, argv_array_base);
+    threadContexts[0]->setIntReg(StackPointerReg, stack_min);
+
+    Addr prog_entry = objFile->entryPoint();
+    threadContexts[0]->setPC(prog_entry);
+    threadContexts[0]->setNextPC(prog_entry + sizeof(MachInst));
+    threadContexts[0]->setNextNPC(prog_entry + (2 * sizeof(MachInst)));
+
+    //Align the "stack_min" to a page boundary.
+    stack_min = roundDown(stack_min, pageSize);
+
+//    num_processes++;
+}