Get X86 to load an elf and start a process for it.

src/arch/x86/SConscript:
    Add in process source files.
src/arch/x86/isa_traits.hh:
    Replace magic constant numbers with the x86 register names.
src/arch/x86/miscregfile.cc:
    Make clear the miscreg file succeed. There aren't any misc regs, so clearing them is very easy.
src/arch/x86/process.hh:
    An X86 process class.
src/base/loader/elf_object.cc:
    Add in code to recognize x86 as an architecture.
src/base/traceflags.py:
    Add an x86 traceflag
src/sim/process.cc:
    Add in code to create an x86 process.
src/arch/x86/intregs.hh:
    A file which declares names for the integer register indices.
src/arch/x86/linux/linux.cc:
src/arch/x86/linux/linux.hh:
    A very simple translation of SPARC's linux.cc and linux.hh. It's probably not correct for x86, but it might not be correct for SPARC either.
src/arch/x86/linux/process.cc:
src/arch/x86/linux/process.hh:
    An x86 linux process. The syscall table is split out into it's own file.
src/arch/x86/linux/syscalls.cc:
    The x86 Linux syscall table and the uname function.
src/arch/x86/process.cc:
    The x86 process base class.
tests/test-progs/hello/bin/x86/linux/hello:
    An x86 hello world test binary.

--HG--
extra : convert_revision : f22919e010c07aeaf5757dca054d9877a537fd08

1 files changed, 359 insertions, 0 deletions

diff --git a/src/arch/x86/process.cc b/src/arch/x86/process.cc
new file mode 100644
index 000000000..e6d1e4921
--- /dev/null
+++ b/src/arch/x86/process.cc
@@ -0,0 +1,359 @@
+/*
+ * Copyright (c) 2003-2006 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Authors: Gabe Black
+ *          Ali Saidi
+ */
+
+/*
+ * Copyright (c) 2007 The Hewlett-Packard Development Company
+ * All rights reserved.
+ *
+ * Redistribution and use of this software in source and binary forms,
+ * with or without modification, are permitted provided that the
+ * following conditions are met:
+ *
+ * The software must be used only for Non-Commercial Use which means any
+ * use which is NOT directed to receiving any direct monetary
+ * compensation for, or commercial advantage from such use.  Illustrative
+ * examples of non-commercial use are academic research, personal study,
+ * teaching, education and corporate research & development.
+ * Illustrative examples of commercial use are distributing products for
+ * commercial advantage and providing services using the software for
+ * commercial advantage.
+ *
+ * If you wish to use this software or functionality therein that may be
+ * covered by patents for commercial use, please contact:
+ *     Director of Intellectual Property Licensing
+ *     Office of Strategy and Technology
+ *     Hewlett-Packard Company
+ *     1501 Page Mill Road
+ *     Palo Alto, California  94304
+ *
+ * Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.  Redistributions
+ * in binary form must reproduce the above copyright notice, this list of
+ * conditions and the following disclaimer in the documentation and/or
+ * other materials provided with the distribution.  Neither the name of
+ * the COPYRIGHT HOLDER(s), HEWLETT-PACKARD COMPANY, nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.  No right of
+ * sublicense is granted herewith.  Derivatives of the software and
+ * output created using the software may be prepared, but only for
+ * Non-Commercial Uses.  Derivatives of the software may be shared with
+ * others provided: (i) the others agree to abide by the list of
+ * conditions herein which includes the Non-Commercial Use restrictions;
+ * and (ii) such Derivatives of the software include the above copyright
+ * notice to acknowledge the contribution from this software where
+ * applicable, this list of conditions and the disclaimer below.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Authors: Gabe Black
+ */
+
+#include "arch/x86/isa_traits.hh"
+#include "arch/x86/process.hh"
+#include "arch/x86/types.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 "mem/translating_port.hh"
+#include "sim/system.hh"
+
+using namespace std;
+using namespace X86ISA;
+
+M5_64_auxv_t::M5_64_auxv_t(int64_t type, int64_t val)
+{
+    a_type = TheISA::htog(type);
+    a_val = TheISA::htog(val);
+}
+
+X86LiveProcess::X86LiveProcess(const std::string &nm, ObjectFile *objFile,
+        System *_system, int stdin_fd, int stdout_fd, int stderr_fd,
+        std::vector<std::string> &argv, std::vector<std::string> &envp,
+        const std::string &cwd,
+        uint64_t _uid, uint64_t _euid, uint64_t _gid, uint64_t _egid,
+        uint64_t _pid, uint64_t _ppid)
+    : LiveProcess(nm, objFile, _system, stdin_fd, stdout_fd, stderr_fd,
+        argv, envp, cwd, _uid, _euid, _gid, _egid, _pid, _ppid)
+{
+    brk_point = objFile->dataBase() + objFile->dataSize() + objFile->bssSize();
+    brk_point = roundUp(brk_point, VMPageSize);
+
+    // Set pointer for next thread stack.  Reserve 8M for main stack.
+    next_thread_stack_base = stack_base - (8 * 1024 * 1024);
+
+    // 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;
+}
+
+void X86LiveProcess::handleTrap(int trapNum, ThreadContext *tc)
+{
+    switch(trapNum)
+    {
+      default:
+        panic("Unimplemented trap to operating system: trap number %#x.\n", trapNum);
+    }
+}
+
+void
+X86LiveProcess::startup()
+{
+    argsInit(sizeof(IntReg), VMPageSize);
+
+    //The AMD64 abi says that only rsp and rdx are defined at process
+    //startup. rsp will be set by argsInit, and I don't understand what
+    //rdx should be set to. The other floating point and integer registers
+    //will be zeroed by the register file constructors, but control registers
+    //should be initialized here. Since none of those are implemented, there
+    //isn't anything here.
+}
+
+void
+X86LiveProcess::argsInit(int intSize, int pageSize)
+{
+    typedef M5_64_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
+    {
+        X86_AT_NULL = 0,
+        X86_AT_IGNORE = 1,
+        X86_AT_EXECFD = 2,
+        X86_AT_PHDR = 3,
+        X86_AT_PHENT = 4,
+        X86_AT_PHNUM = 5,
+        X86_AT_PAGESZ = 6,
+        X86_AT_BASE = 7,
+        X86_AT_FLAGS = 8,
+        X86_AT_ENTRY = 9,
+        X86_AT_NOTELF = 10,
+        X86_AT_UID = 11,
+        X86_AT_EUID = 12,
+        X86_AT_GID = 13,
+        X86_AT_EGID = 14
+    };
+
+    //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(X86, "The addresses of items on the initial stack:\n");
+    DPRINTF(X86, "0x%x - file name\n", file_name_base);
+    DPRINTF(X86, "0x%x - env data\n", env_data_base);
+    DPRINTF(X86, "0x%x - arg data\n", arg_data_base);
+    DPRINTF(X86, "0x%x - auxv array\n", auxv_array_base);
+    DPRINTF(X86, "0x%x - envp array\n", envp_array_base);
+    DPRINTF(X86, "0x%x - argv array\n", argv_array_base);
+    DPRINTF(X86, "0x%x - argc \n", argc_base);
+    DPRINTF(X86, "0x%x - window save\n", window_save_base);
+    DPRINTF(X86, "0x%x - stack min\n", stack_min);
+
+    // write contents to stack
+
+    // figure out argc
+    uint64_t argc = argv.size();
+    uint64_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);
+    copyStringArray(argv, argv_array_base, arg_data_base, initVirtMem);
+
+    initVirtMem->writeBlob(argc_base, (uint8_t*)&guestArgc, intSize);
+
+    //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));
+
+    //Align the "stack_min" to a page boundary.
+    stack_min = roundDown(stack_min, pageSize);
+
+//    num_processes++;
+}