process.cc revision 11905
1/* 2 * Copyright (c) 2007-2008 The Florida State University 3 * Copyright (c) 2009 The University of Edinburgh 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are 8 * met: redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer; 10 * redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution; 13 * neither the name of the copyright holders nor the names of its 14 * contributors may be used to endorse or promote products derived from 15 * this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 20 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 21 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 22 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 23 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * Authors: Stephen Hines 30 * Timothy M. Jones 31 */ 32 33#include "arch/power/process.hh" 34 35#include "arch/power/isa_traits.hh" 36#include "arch/power/types.hh" 37#include "base/loader/elf_object.hh" 38#include "base/loader/object_file.hh" 39#include "base/misc.hh" 40#include "cpu/thread_context.hh" 41#include "debug/Stack.hh" 42#include "mem/page_table.hh" 43#include "sim/aux_vector.hh" 44#include "sim/process_impl.hh" 45#include "sim/syscall_return.hh" 46#include "sim/system.hh" 47 48using namespace std; 49using namespace PowerISA; 50 51PowerProcess::PowerProcess(ProcessParams *params, ObjectFile *objFile) 52 : Process(params, objFile) 53{ 54 // Set up break point (Top of Heap) 55 Addr brk_point = objFile->dataBase() + objFile->dataSize() + 56 objFile->bssSize(); 57 brk_point = roundUp(brk_point, PageBytes); 58 59 Addr stack_base = 0xbf000000L; 60 61 Addr max_stack_size = 8 * 1024 * 1024; 62 63 // Set pointer for next thread stack. Reserve 8M for main stack. 64 Addr next_thread_stack_base = stack_base - max_stack_size; 65 66 // Set up region for mmaps. For now, start at bottom of kuseg space. 67 Addr mmap_end = 0x70000000L; 68 69 memState = make_shared<MemState>(brk_point, stack_base, max_stack_size, 70 next_thread_stack_base, mmap_end); 71} 72 73void 74PowerProcess::initState() 75{ 76 Process::initState(); 77 78 argsInit(MachineBytes, PageBytes); 79} 80 81void 82PowerProcess::argsInit(int intSize, int pageSize) 83{ 84 typedef AuxVector<uint32_t> auxv_t; 85 std::vector<auxv_t> auxv; 86 87 string filename; 88 if (argv.size() < 1) 89 filename = ""; 90 else 91 filename = argv[0]; 92 93 //We want 16 byte alignment 94 uint64_t align = 16; 95 96 // Patch the ld_bias for dynamic executables. 97 updateBias(); 98 99 // load object file into target memory 100 objFile->loadSections(initVirtMem); 101 102 //Setup the auxilliary vectors. These will already have endian conversion. 103 //Auxilliary vectors are loaded only for elf formatted executables. 104 ElfObject * elfObject = dynamic_cast<ElfObject *>(objFile); 105 if (elfObject) { 106 uint32_t features = 0; 107 108 //Bits which describe the system hardware capabilities 109 //XXX Figure out what these should be 110 auxv.push_back(auxv_t(M5_AT_HWCAP, features)); 111 //The system page size 112 auxv.push_back(auxv_t(M5_AT_PAGESZ, PowerISA::PageBytes)); 113 //Frequency at which times() increments 114 auxv.push_back(auxv_t(M5_AT_CLKTCK, 0x64)); 115 // For statically linked executables, this is the virtual address of the 116 // program header tables if they appear in the executable image 117 auxv.push_back(auxv_t(M5_AT_PHDR, elfObject->programHeaderTable())); 118 // This is the size of a program header entry from the elf file. 119 auxv.push_back(auxv_t(M5_AT_PHENT, elfObject->programHeaderSize())); 120 // This is the number of program headers from the original elf file. 121 auxv.push_back(auxv_t(M5_AT_PHNUM, elfObject->programHeaderCount())); 122 // This is the base address of the ELF interpreter; it should be 123 // zero for static executables or contain the base address for 124 // dynamic executables. 125 auxv.push_back(auxv_t(M5_AT_BASE, getBias())); 126 //XXX Figure out what this should be. 127 auxv.push_back(auxv_t(M5_AT_FLAGS, 0)); 128 //The entry point to the program 129 auxv.push_back(auxv_t(M5_AT_ENTRY, objFile->entryPoint())); 130 //Different user and group IDs 131 auxv.push_back(auxv_t(M5_AT_UID, uid())); 132 auxv.push_back(auxv_t(M5_AT_EUID, euid())); 133 auxv.push_back(auxv_t(M5_AT_GID, gid())); 134 auxv.push_back(auxv_t(M5_AT_EGID, egid())); 135 //Whether to enable "secure mode" in the executable 136 auxv.push_back(auxv_t(M5_AT_SECURE, 0)); 137 //The filename of the program 138 auxv.push_back(auxv_t(M5_AT_EXECFN, 0)); 139 //The string "v51" with unknown meaning 140 auxv.push_back(auxv_t(M5_AT_PLATFORM, 0)); 141 } 142 143 //Figure out how big the initial stack nedes to be 144 145 // A sentry NULL void pointer at the top of the stack. 146 int sentry_size = intSize; 147 148 string platform = "v51"; 149 int platform_size = platform.size() + 1; 150 151 // The aux vectors are put on the stack in two groups. The first group are 152 // the vectors that are generated as the elf is loaded. The second group 153 // are the ones that were computed ahead of time and include the platform 154 // string. 155 int aux_data_size = filename.size() + 1; 156 157 int env_data_size = 0; 158 for (int i = 0; i < envp.size(); ++i) { 159 env_data_size += envp[i].size() + 1; 160 } 161 int arg_data_size = 0; 162 for (int i = 0; i < argv.size(); ++i) { 163 arg_data_size += argv[i].size() + 1; 164 } 165 166 int info_block_size = 167 sentry_size + env_data_size + arg_data_size + 168 aux_data_size + platform_size; 169 170 //Each auxilliary vector is two 4 byte words 171 int aux_array_size = intSize * 2 * (auxv.size() + 1); 172 173 int envp_array_size = intSize * (envp.size() + 1); 174 int argv_array_size = intSize * (argv.size() + 1); 175 176 int argc_size = intSize; 177 178 //Figure out the size of the contents of the actual initial frame 179 int frame_size = 180 info_block_size + 181 aux_array_size + 182 envp_array_size + 183 argv_array_size + 184 argc_size; 185 186 //There needs to be padding after the auxiliary vector data so that the 187 //very bottom of the stack is aligned properly. 188 int partial_size = frame_size; 189 int aligned_partial_size = roundUp(partial_size, align); 190 int aux_padding = aligned_partial_size - partial_size; 191 192 int space_needed = frame_size + aux_padding; 193 194 Addr stack_min = memState->getStackBase() - space_needed; 195 stack_min = roundDown(stack_min, align); 196 197 memState->setStackSize(memState->getStackBase() - stack_min); 198 199 // map memory 200 allocateMem(roundDown(stack_min, pageSize), 201 roundUp(memState->getStackSize(), pageSize)); 202 203 // map out initial stack contents 204 uint32_t sentry_base = memState->getStackBase() - sentry_size; 205 uint32_t aux_data_base = sentry_base - aux_data_size; 206 uint32_t env_data_base = aux_data_base - env_data_size; 207 uint32_t arg_data_base = env_data_base - arg_data_size; 208 uint32_t platform_base = arg_data_base - platform_size; 209 uint32_t auxv_array_base = platform_base - aux_array_size - aux_padding; 210 uint32_t envp_array_base = auxv_array_base - envp_array_size; 211 uint32_t argv_array_base = envp_array_base - argv_array_size; 212 uint32_t argc_base = argv_array_base - argc_size; 213 214 DPRINTF(Stack, "The addresses of items on the initial stack:\n"); 215 DPRINTF(Stack, "0x%x - aux data\n", aux_data_base); 216 DPRINTF(Stack, "0x%x - env data\n", env_data_base); 217 DPRINTF(Stack, "0x%x - arg data\n", arg_data_base); 218 DPRINTF(Stack, "0x%x - platform base\n", platform_base); 219 DPRINTF(Stack, "0x%x - auxv array\n", auxv_array_base); 220 DPRINTF(Stack, "0x%x - envp array\n", envp_array_base); 221 DPRINTF(Stack, "0x%x - argv array\n", argv_array_base); 222 DPRINTF(Stack, "0x%x - argc \n", argc_base); 223 DPRINTF(Stack, "0x%x - stack min\n", stack_min); 224 225 // write contents to stack 226 227 // figure out argc 228 uint32_t argc = argv.size(); 229 uint32_t guestArgc = PowerISA::htog(argc); 230 231 //Write out the sentry void * 232 uint32_t sentry_NULL = 0; 233 initVirtMem.writeBlob(sentry_base, 234 (uint8_t*)&sentry_NULL, sentry_size); 235 236 //Fix up the aux vectors which point to other data 237 for (int i = auxv.size() - 1; i >= 0; i--) { 238 if (auxv[i].a_type == M5_AT_PLATFORM) { 239 auxv[i].a_val = platform_base; 240 initVirtMem.writeString(platform_base, platform.c_str()); 241 } else if (auxv[i].a_type == M5_AT_EXECFN) { 242 auxv[i].a_val = aux_data_base; 243 initVirtMem.writeString(aux_data_base, filename.c_str()); 244 } 245 } 246 247 //Copy the aux stuff 248 for (int x = 0; x < auxv.size(); x++) 249 { 250 initVirtMem.writeBlob(auxv_array_base + x * 2 * intSize, 251 (uint8_t*)&(auxv[x].a_type), intSize); 252 initVirtMem.writeBlob(auxv_array_base + (x * 2 + 1) * intSize, 253 (uint8_t*)&(auxv[x].a_val), intSize); 254 } 255 //Write out the terminating zeroed auxilliary vector 256 const uint64_t zero = 0; 257 initVirtMem.writeBlob(auxv_array_base + 2 * intSize * auxv.size(), 258 (uint8_t*)&zero, 2 * intSize); 259 260 copyStringArray(envp, envp_array_base, env_data_base, initVirtMem); 261 copyStringArray(argv, argv_array_base, arg_data_base, initVirtMem); 262 263 initVirtMem.writeBlob(argc_base, (uint8_t*)&guestArgc, intSize); 264 265 ThreadContext *tc = system->getThreadContext(contextIds[0]); 266 267 //Set the stack pointer register 268 tc->setIntReg(StackPointerReg, stack_min); 269 270 tc->pcState(getStartPC()); 271 272 //Align the "stack_min" to a page boundary. 273 memState->setStackMin(roundDown(stack_min, pageSize)); 274} 275 276PowerISA::IntReg 277PowerProcess::getSyscallArg(ThreadContext *tc, int &i) 278{ 279 assert(i < 5); 280 return tc->readIntReg(ArgumentReg0 + i++); 281} 282 283void 284PowerProcess::setSyscallArg(ThreadContext *tc, int i, PowerISA::IntReg val) 285{ 286 assert(i < 5); 287 tc->setIntReg(ArgumentReg0 + i, val); 288} 289 290void 291PowerProcess::setSyscallReturn(ThreadContext *tc, SyscallReturn sysret) 292{ 293 Cr cr = tc->readIntReg(INTREG_CR); 294 if (sysret.successful()) { 295 cr.cr0.so = 0; 296 } else { 297 cr.cr0.so = 1; 298 } 299 tc->setIntReg(INTREG_CR, cr); 300 tc->setIntReg(ReturnValueReg, sysret.encodedValue()); 301} 302