From 835a55e7f347697815fc43851b2dd5a8642d21c4 Mon Sep 17 00:00:00 2001 From: "Timothy M. Jones" Date: Tue, 27 Oct 2009 09:24:39 -0700 Subject: 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. --- src/arch/power/process.cc | 288 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 288 insertions(+) create mode 100644 src/arch/power/process.cc (limited to 'src/arch/power/process.cc') 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 auxv_t; + std::vector 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(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()); +} -- cgit v1.2.3