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Diffstat (limited to 'src/arch/riscv/process.cc')
-rw-r--r-- | src/arch/riscv/process.cc | 238 |
1 files changed, 238 insertions, 0 deletions
diff --git a/src/arch/riscv/process.cc b/src/arch/riscv/process.cc new file mode 100644 index 000000000..7fa84035f --- /dev/null +++ b/src/arch/riscv/process.cc @@ -0,0 +1,238 @@ +/* + * Copyright (c) 2004-2005 The Regents of The University of Michigan + * Copyright (c) 2016 The University of Virginia + * 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 + * Korey Sewell + * Alec Roelke + */ +#include "arch/riscv/process.hh" + +#include <vector> + +#include "arch/riscv/isa_traits.hh" +#include "base/loader/elf_object.hh" +#include "base/loader/object_file.hh" +#include "base/misc.hh" +#include "cpu/thread_context.hh" +#include "debug/Loader.hh" +#include "mem/page_table.hh" +#include "sim/process.hh" +#include "sim/process_impl.hh" +#include "sim/system.hh" + +using namespace std; +using namespace RiscvISA; + +RiscvLiveProcess::RiscvLiveProcess(LiveProcessParams * params, + ObjectFile *objFile) : LiveProcess(params, objFile) +{ + // Set up stack. On RISC-V, stack starts at the top of kuseg + // user address space. RISC-V stack grows down from here + stack_base = 0x7FFFFFFF; + + // 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->bssBase() + objFile->bssSize(); + + // Set up region for mmaps. Start it 1GB above the top of the heap. + mmap_end = brk_point + 0x40000000L; +} + +void +RiscvLiveProcess::initState() +{ + LiveProcess::initState(); + + argsInit<uint64_t>(PageBytes); +} + +template<class IntType> void +RiscvLiveProcess::argsInit(int pageSize) +{ + updateBias(); + + // load object file into target memory + objFile->loadSections(initVirtMem); + + typedef AuxVector<IntType> auxv_t; + vector<auxv_t> auxv; + ElfObject * elfObject = dynamic_cast<ElfObject *>(objFile); + if (elfObject) { + // Set the system page size + auxv.push_back(auxv_t(M5_AT_PAGESZ, RiscvISA::PageBytes)); + // Set the frequency at which time() increments + auxv.push_back(auxv_t(M5_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(M5_AT_PHDR, elfObject->programHeaderTable())); + DPRINTF(Loader, "auxv at PHDR %08p\n", + 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())); + auxv.push_back(auxv_t(M5_AT_BASE, getBias())); + //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())); + } + + const IntType zero = 0; + IntType argc = htog((IntType)argv.size()); + int argv_array_size = sizeof(Addr) * argv.size(); + int arg_data_size = 0; + for (string arg: argv) + arg_data_size += arg.size() + 1; + int envp_array_size = sizeof(Addr) * envp.size(); + int env_data_size = 0; + for (string env: envp) + env_data_size += env.size() + 1; + int auxv_array_size = 2 * sizeof(IntType)*auxv.size(); + + stack_size = sizeof(IntType) + argv_array_size + 2 * sizeof(Addr) + + arg_data_size + 2 * sizeof(Addr); + if (!envp.empty()) { + stack_size += 2 * sizeof(Addr) + envp_array_size + 2 * sizeof(Addr) + + env_data_size; + } + if (!auxv.empty()) + stack_size += 2 * sizeof(Addr) + auxv_array_size; + stack_min = roundDown(stack_base - stack_size, pageSize); + allocateMem(stack_min, roundUp(stack_size, pageSize)); + + Addr argv_array_base = stack_min + sizeof(IntType); + Addr arg_data_base = argv_array_base + argv_array_size + 2 * sizeof(Addr); + Addr envp_array_base = arg_data_base + arg_data_size; + if (!envp.empty()) + envp_array_base += 2 * sizeof(Addr); + Addr env_data_base = envp_array_base + envp_array_size; + if (!envp.empty()) + env_data_base += 2 * sizeof(Addr); + + vector<Addr> arg_pointers; + if (!argv.empty()) { + arg_pointers.push_back(arg_data_base); + for (int i = 0; i < argv.size() - 1; i++) { + arg_pointers.push_back(arg_pointers[i] + argv[i].size() + 1); + } + } + + vector<Addr> env_pointers; + if (!envp.empty()) { + env_pointers.push_back(env_data_base); + for (int i = 0; i < envp.size() - 1; i++) { + env_pointers.push_back(env_pointers[i] + envp[i].size() + 1); + } + } + + Addr sp = stack_min; + initVirtMem.writeBlob(sp, (uint8_t *)&argc, sizeof(IntType)); + sp += sizeof(IntType); + for (Addr arg_pointer: arg_pointers) { + initVirtMem.writeBlob(sp, (uint8_t *)&arg_pointer, sizeof(Addr)); + sp += sizeof(Addr); + } + for (int i = 0; i < 2; i++) { + initVirtMem.writeBlob(sp, (uint8_t *)&zero, sizeof(Addr)); + sp += sizeof(Addr); + } + for (int i = 0; i < argv.size(); i++) { + initVirtMem.writeString(sp, argv[i].c_str()); + sp += argv[i].size() + 1; + } + if (!envp.empty()) { + for (int i = 0; i < 2; i++) { + initVirtMem.writeBlob(sp, (uint8_t *)&zero, sizeof(Addr)); + sp += sizeof(Addr); + } + } + for (Addr env_pointer: env_pointers) + initVirtMem.writeBlob(sp, (uint8_t *)&env_pointer, sizeof(Addr)); + if (!envp.empty()) { + for (int i = 0; i < 2; i++) { + initVirtMem.writeBlob(sp, (uint8_t *)&zero, sizeof(Addr)); + sp += sizeof(Addr); + } + } + for (int i = 0; i < envp.size(); i++) { + initVirtMem.writeString(sp, envp[i].c_str()); + sp += envp[i].size() + 1; + } + if (!auxv.empty()) { + for (int i = 0; i < 2; i++) { + initVirtMem.writeBlob(sp, (uint8_t *)&zero, sizeof(Addr)); + sp += sizeof(Addr); + } + } + for (auxv_t aux: auxv) { + initVirtMem.writeBlob(sp, (uint8_t *)&aux.a_type, sizeof(IntType)); + initVirtMem.writeBlob(sp + sizeof(IntType), (uint8_t *)&aux.a_val, + sizeof(IntType)); + sp += 2 * sizeof(IntType); + } + for (int i = 0; i < 2; i++) { + initVirtMem.writeBlob(sp, (uint8_t *)&zero, sizeof(Addr)); + sp += sizeof(Addr); + } + + ThreadContext *tc = system->getThreadContext(contextIds[0]); + tc->setIntReg(StackPointerReg, stack_min); + tc->pcState(getStartPC()); +} + +RiscvISA::IntReg +RiscvLiveProcess::getSyscallArg(ThreadContext *tc, int &i) +{ + return tc->readIntReg(SyscallArgumentRegs[i++]); +} + +void +RiscvLiveProcess::setSyscallArg(ThreadContext *tc, int i, RiscvISA::IntReg val) +{ + tc->setIntReg(SyscallArgumentRegs[i], val); +} + +void +RiscvLiveProcess::setSyscallReturn(ThreadContext *tc, SyscallReturn sysret) +{ + if (sysret.successful()) { + // no error + tc->setIntReg(SyscallPseudoReturnReg, sysret.returnValue()); + } else { + // got an error, return details + tc->setIntReg(SyscallPseudoReturnReg, sysret.errnoValue()); + } +} |