POWER: Add support for the Power ISA

This adds support for the 32-bit, big endian Power ISA. This supports both
integer and floating point instructions based on the Power ISA Book I v2.06.

1 files changed, 288 insertions, 0 deletions

diff --git a/src/arch/power/process.cc b/src/arch/power/process.cc
new file mode 100644
index 000000000..8828a1a93
--- /dev/null
+++ b/src/arch/power/process.cc
@@ -0,0 +1,288 @@
+/*
+ * Copyright (c) 2007-2008 The Florida State University
+ * Copyright (c) 2009 The University of Edinburgh
+ * 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: Stephen Hines
+ *          Timothy M. Jones
+ */
+
+#include "arch/power/isa_traits.hh"
+#include "arch/power/process.hh"
+#include "arch/power/types.hh"
+#include "base/loader/elf_object.hh"
+#include "base/loader/object_file.hh"
+#include "base/misc.hh"
+#include "cpu/thread_context.hh"
+#include "mem/page_table.hh"
+#include "mem/translating_port.hh"
+#include "sim/process_impl.hh"
+#include "sim/system.hh"
+
+using namespace std;
+using namespace PowerISA;
+
+PowerLiveProcess::PowerLiveProcess(LiveProcessParams *params,
+        ObjectFile *objFile)
+    : LiveProcess(params, objFile)
+{
+    stack_base = 0xbf000000L;
+
+    // Set pointer for next thread stack.  Reserve 8M for main stack.
+    next_thread_stack_base = stack_base - (8 * 1024 * 1024);
+
+    // Set up break point (Top of Heap)
+    brk_point = objFile->dataBase() + objFile->dataSize() + objFile->bssSize();
+    brk_point = roundUp(brk_point, VMPageSize);
+
+    // Set up region for mmaps. For now, start at bottom of kuseg space.
+    mmap_start = mmap_end = 0x70000000L;
+}
+
+void
+PowerLiveProcess::startup()
+{
+    argsInit(MachineBytes, VMPageSize);
+}
+
+void
+PowerLiveProcess::argsInit(int intSize, int pageSize)
+{
+    typedef AuxVector<uint32_t> auxv_t;
+    std::vector<auxv_t> auxv;
+
+    string filename;
+    if (argv.size() < 1)
+        filename = "";
+    else
+        filename = argv[0];
+
+    //We want 16 byte alignment
+    uint64_t align = 16;
+
+    // Overloaded argsInit so that we can fine-tune for POWER architecture
+    Process::startup();
+
+    // load object file into target memory
+    objFile->loadSections(initVirtMem);
+
+    //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) {
+        uint32_t features = 0;
+
+        //Bits which describe the system hardware capabilities
+        //XXX Figure out what these should be
+        auxv.push_back(auxv_t(M5_AT_HWCAP, features));
+        //The system page size
+        auxv.push_back(auxv_t(M5_AT_PAGESZ, PowerISA::VMPageSize));
+        //Frequency at which times() increments
+        auxv.push_back(auxv_t(M5_AT_CLKTCK, 0x64));
+        // 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(M5_AT_PHDR, elfObject->programHeaderTable()));
+        // This is the size of a program header entry from the elf file.
+        auxv.push_back(auxv_t(M5_AT_PHENT, elfObject->programHeaderSize()));
+        // This is the number of program headers from the original elf file.
+        auxv.push_back(auxv_t(M5_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(M5_AT_BASE, 0));
+
+        //XXX Figure out what this should be.
+        auxv.push_back(auxv_t(M5_AT_FLAGS, 0));
+        //The entry point to the program
+        auxv.push_back(auxv_t(M5_AT_ENTRY, objFile->entryPoint()));
+        //Different user and group IDs
+        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()));
+        //Whether to enable "secure mode" in the executable
+        auxv.push_back(auxv_t(M5_AT_SECURE, 0));
+        //The filename of the program
+        auxv.push_back(auxv_t(M5_AT_EXECFN, 0));
+        //The string "v51" with unknown meaning
+        auxv.push_back(auxv_t(M5_AT_PLATFORM, 0));
+    }
+
+    //Figure out how big the initial stack nedes to be
+
+    // A sentry NULL void pointer at the top of the stack.
+    int sentry_size = intSize;
+
+    string platform = "v51";
+    int platform_size = platform.size() + 1;
+
+    // The aux vectors are put on the stack in two groups. The first group are
+    // the vectors that are generated as the elf is loaded. The second group
+    // are the ones that were computed ahead of time and include the platform
+    // string.
+    int aux_data_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;
+    }
+
+    int info_block_size =
+        sentry_size + env_data_size + arg_data_size +
+        aux_data_size + platform_size;
+
+    //Each auxilliary vector is two 4 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;
+
+    //Figure out the size of the contents of the actual initial frame
+    int frame_size =
+        info_block_size +
+        aux_array_size +
+        envp_array_size +
+        argv_array_size +
+        argc_size;
+
+    //There needs to be padding after the auxiliary vector data so that the
+    //very bottom of the stack is aligned properly.
+    int partial_size = frame_size;
+    int aligned_partial_size = roundUp(partial_size, align);
+    int aux_padding = aligned_partial_size - partial_size;
+
+    int space_needed = frame_size + aux_padding;
+
+    stack_min = stack_base - space_needed;
+    stack_min = roundDown(stack_min, align);
+    stack_size = stack_base - stack_min;
+
+    // map memory
+    pTable->allocate(roundDown(stack_min, pageSize),
+                     roundUp(stack_size, pageSize));
+
+    // map out initial stack contents
+    uint32_t sentry_base = stack_base - sentry_size;
+    uint32_t aux_data_base = sentry_base - aux_data_size;
+    uint32_t env_data_base = aux_data_base - env_data_size;
+    uint32_t arg_data_base = env_data_base - arg_data_size;
+    uint32_t platform_base = arg_data_base - platform_size;
+    uint32_t auxv_array_base = platform_base - aux_array_size - aux_padding;
+    uint32_t envp_array_base = auxv_array_base - envp_array_size;
+    uint32_t argv_array_base = envp_array_base - argv_array_size;
+    uint32_t argc_base = argv_array_base - argc_size;
+
+    DPRINTF(Stack, "The addresses of items on the initial stack:\n");
+    DPRINTF(Stack, "0x%x - aux data\n", aux_data_base);
+    DPRINTF(Stack, "0x%x - env data\n", env_data_base);
+    DPRINTF(Stack, "0x%x - arg data\n", arg_data_base);
+    DPRINTF(Stack, "0x%x - platform base\n", platform_base);
+    DPRINTF(Stack, "0x%x - auxv array\n", auxv_array_base);
+    DPRINTF(Stack, "0x%x - envp array\n", envp_array_base);
+    DPRINTF(Stack, "0x%x - argv array\n", argv_array_base);
+    DPRINTF(Stack, "0x%x - argc \n", argc_base);
+    DPRINTF(Stack, "0x%x - stack min\n", stack_min);
+
+    // write contents to stack
+
+    // figure out argc
+    uint32_t argc = argv.size();
+    uint32_t guestArgc = PowerISA::htog(argc);
+
+    //Write out the sentry void *
+    uint32_t sentry_NULL = 0;
+    initVirtMem->writeBlob(sentry_base,
+            (uint8_t*)&sentry_NULL, sentry_size);
+
+    //Fix up the aux vectors which point to other data
+    for (int i = auxv.size() - 1; i >= 0; i--) {
+        if (auxv[i].a_type == M5_AT_PLATFORM) {
+            auxv[i].a_val = platform_base;
+            initVirtMem->writeString(platform_base, platform.c_str());
+        } else if (auxv[i].a_type == M5_AT_EXECFN) {
+            auxv[i].a_val = aux_data_base;
+            initVirtMem->writeString(aux_data_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);
+
+    ThreadContext *tc = system->getThreadContext(contextIds[0]);
+
+    //Set the stack pointer register
+    tc->setIntReg(StackPointerReg, stack_min);
+
+    Addr prog_entry = objFile->entryPoint();
+    tc->setPC(prog_entry);
+    tc->setNextPC(prog_entry + sizeof(MachInst));
+
+    //Align the "stack_min" to a page boundary.
+    stack_min = roundDown(stack_min, pageSize);
+}
+
+PowerISA::IntReg
+PowerLiveProcess::getSyscallArg(ThreadContext *tc, int i)
+{
+    assert(i < 5);
+    return tc->readIntReg(ArgumentReg0 + i);
+}
+
+void
+PowerLiveProcess::setSyscallArg(ThreadContext *tc,
+        int i, PowerISA::IntReg val)
+{
+    assert(i < 5);
+    tc->setIntReg(ArgumentReg0 + i, val);
+}
+
+void
+PowerLiveProcess::setSyscallReturn(ThreadContext *tc,
+        SyscallReturn return_value)
+{
+    tc->setIntReg(ReturnValueReg, return_value.value());
+}