process.cc revision 11800
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/process_impl.hh" 44#include "sim/syscall_return.hh" 45#include "sim/system.hh" 46 47using namespace std; 48using namespace PowerISA; 49 50PowerLiveProcess::PowerLiveProcess(LiveProcessParams *params, 51 ObjectFile *objFile) 52 : LiveProcess(params, objFile) 53{ 54 stack_base = 0xbf000000L; 55 56 // Set pointer for next thread stack. Reserve 8M for main stack. 57 next_thread_stack_base = stack_base - (8 * 1024 * 1024); 58 59 // Set up break point (Top of Heap) 60 brk_point = objFile->dataBase() + objFile->dataSize() + objFile->bssSize(); 61 brk_point = roundUp(brk_point, PageBytes); 62 63 // Set up region for mmaps. For now, start at bottom of kuseg space. 64 mmap_end = 0x70000000L; 65} 66 67void 68PowerLiveProcess::initState() 69{ 70 Process::initState(); 71 72 argsInit(MachineBytes, PageBytes); 73} 74 75void 76PowerLiveProcess::argsInit(int intSize, int pageSize) 77{ 78 typedef AuxVector<uint32_t> auxv_t; 79 std::vector<auxv_t> auxv; 80 81 string filename; 82 if (argv.size() < 1) 83 filename = ""; 84 else 85 filename = argv[0]; 86 87 //We want 16 byte alignment 88 uint64_t align = 16; 89 90 // Patch the ld_bias for dynamic executables. 91 updateBias(); 92 93 // load object file into target memory 94 objFile->loadSections(initVirtMem); 95 96 //Setup the auxilliary vectors. These will already have endian conversion. 97 //Auxilliary vectors are loaded only for elf formatted executables. 98 ElfObject * elfObject = dynamic_cast<ElfObject *>(objFile); 99 if (elfObject) { 100 uint32_t features = 0; 101 102 //Bits which describe the system hardware capabilities 103 //XXX Figure out what these should be 104 auxv.push_back(auxv_t(M5_AT_HWCAP, features)); 105 //The system page size 106 auxv.push_back(auxv_t(M5_AT_PAGESZ, PowerISA::PageBytes)); 107 //Frequency at which times() increments 108 auxv.push_back(auxv_t(M5_AT_CLKTCK, 0x64)); 109 // For statically linked executables, this is the virtual address of the 110 // program header tables if they appear in the executable image 111 auxv.push_back(auxv_t(M5_AT_PHDR, elfObject->programHeaderTable())); 112 // This is the size of a program header entry from the elf file. 113 auxv.push_back(auxv_t(M5_AT_PHENT, elfObject->programHeaderSize())); 114 // This is the number of program headers from the original elf file. 115 auxv.push_back(auxv_t(M5_AT_PHNUM, elfObject->programHeaderCount())); 116 // This is the base address of the ELF interpreter; it should be 117 // zero for static executables or contain the base address for 118 // dynamic executables. 119 auxv.push_back(auxv_t(M5_AT_BASE, getBias())); 120 //XXX Figure out what this should be. 121 auxv.push_back(auxv_t(M5_AT_FLAGS, 0)); 122 //The entry point to the program 123 auxv.push_back(auxv_t(M5_AT_ENTRY, objFile->entryPoint())); 124 //Different user and group IDs 125 auxv.push_back(auxv_t(M5_AT_UID, uid())); 126 auxv.push_back(auxv_t(M5_AT_EUID, euid())); 127 auxv.push_back(auxv_t(M5_AT_GID, gid())); 128 auxv.push_back(auxv_t(M5_AT_EGID, egid())); 129 //Whether to enable "secure mode" in the executable 130 auxv.push_back(auxv_t(M5_AT_SECURE, 0)); 131 //The filename of the program 132 auxv.push_back(auxv_t(M5_AT_EXECFN, 0)); 133 //The string "v51" with unknown meaning 134 auxv.push_back(auxv_t(M5_AT_PLATFORM, 0)); 135 } 136 137 //Figure out how big the initial stack nedes to be 138 139 // A sentry NULL void pointer at the top of the stack. 140 int sentry_size = intSize; 141 142 string platform = "v51"; 143 int platform_size = platform.size() + 1; 144 145 // The aux vectors are put on the stack in two groups. The first group are 146 // the vectors that are generated as the elf is loaded. The second group 147 // are the ones that were computed ahead of time and include the platform 148 // string. 149 int aux_data_size = filename.size() + 1; 150 151 int env_data_size = 0; 152 for (int i = 0; i < envp.size(); ++i) { 153 env_data_size += envp[i].size() + 1; 154 } 155 int arg_data_size = 0; 156 for (int i = 0; i < argv.size(); ++i) { 157 arg_data_size += argv[i].size() + 1; 158 } 159 160 int info_block_size = 161 sentry_size + env_data_size + arg_data_size + 162 aux_data_size + platform_size; 163 164 //Each auxilliary vector is two 4 byte words 165 int aux_array_size = intSize * 2 * (auxv.size() + 1); 166 167 int envp_array_size = intSize * (envp.size() + 1); 168 int argv_array_size = intSize * (argv.size() + 1); 169 170 int argc_size = intSize; 171 172 //Figure out the size of the contents of the actual initial frame 173 int frame_size = 174 info_block_size + 175 aux_array_size + 176 envp_array_size + 177 argv_array_size + 178 argc_size; 179 180 //There needs to be padding after the auxiliary vector data so that the 181 //very bottom of the stack is aligned properly. 182 int partial_size = frame_size; 183 int aligned_partial_size = roundUp(partial_size, align); 184 int aux_padding = aligned_partial_size - partial_size; 185 186 int space_needed = frame_size + aux_padding; 187 188 stack_min = stack_base - space_needed; 189 stack_min = roundDown(stack_min, align); 190 stack_size = stack_base - stack_min; 191 192 // map memory 193 allocateMem(roundDown(stack_min, pageSize), roundUp(stack_size, pageSize)); 194 195 // map out initial stack contents 196 uint32_t sentry_base = stack_base - sentry_size; 197 uint32_t aux_data_base = sentry_base - aux_data_size; 198 uint32_t env_data_base = aux_data_base - env_data_size; 199 uint32_t arg_data_base = env_data_base - arg_data_size; 200 uint32_t platform_base = arg_data_base - platform_size; 201 uint32_t auxv_array_base = platform_base - aux_array_size - aux_padding; 202 uint32_t envp_array_base = auxv_array_base - envp_array_size; 203 uint32_t argv_array_base = envp_array_base - argv_array_size; 204 uint32_t argc_base = argv_array_base - argc_size; 205 206 DPRINTF(Stack, "The addresses of items on the initial stack:\n"); 207 DPRINTF(Stack, "0x%x - aux data\n", aux_data_base); 208 DPRINTF(Stack, "0x%x - env data\n", env_data_base); 209 DPRINTF(Stack, "0x%x - arg data\n", arg_data_base); 210 DPRINTF(Stack, "0x%x - platform base\n", platform_base); 211 DPRINTF(Stack, "0x%x - auxv array\n", auxv_array_base); 212 DPRINTF(Stack, "0x%x - envp array\n", envp_array_base); 213 DPRINTF(Stack, "0x%x - argv array\n", argv_array_base); 214 DPRINTF(Stack, "0x%x - argc \n", argc_base); 215 DPRINTF(Stack, "0x%x - stack min\n", stack_min); 216 217 // write contents to stack 218 219 // figure out argc 220 uint32_t argc = argv.size(); 221 uint32_t guestArgc = PowerISA::htog(argc); 222 223 //Write out the sentry void * 224 uint32_t sentry_NULL = 0; 225 initVirtMem.writeBlob(sentry_base, 226 (uint8_t*)&sentry_NULL, sentry_size); 227 228 //Fix up the aux vectors which point to other data 229 for (int i = auxv.size() - 1; i >= 0; i--) { 230 if (auxv[i].a_type == M5_AT_PLATFORM) { 231 auxv[i].a_val = platform_base; 232 initVirtMem.writeString(platform_base, platform.c_str()); 233 } else if (auxv[i].a_type == M5_AT_EXECFN) { 234 auxv[i].a_val = aux_data_base; 235 initVirtMem.writeString(aux_data_base, filename.c_str()); 236 } 237 } 238 239 //Copy the aux stuff 240 for (int x = 0; x < auxv.size(); x++) 241 { 242 initVirtMem.writeBlob(auxv_array_base + x * 2 * intSize, 243 (uint8_t*)&(auxv[x].a_type), intSize); 244 initVirtMem.writeBlob(auxv_array_base + (x * 2 + 1) * intSize, 245 (uint8_t*)&(auxv[x].a_val), intSize); 246 } 247 //Write out the terminating zeroed auxilliary vector 248 const uint64_t zero = 0; 249 initVirtMem.writeBlob(auxv_array_base + 2 * intSize * auxv.size(), 250 (uint8_t*)&zero, 2 * intSize); 251 252 copyStringArray(envp, envp_array_base, env_data_base, initVirtMem); 253 copyStringArray(argv, argv_array_base, arg_data_base, initVirtMem); 254 255 initVirtMem.writeBlob(argc_base, (uint8_t*)&guestArgc, intSize); 256 257 ThreadContext *tc = system->getThreadContext(contextIds[0]); 258 259 //Set the stack pointer register 260 tc->setIntReg(StackPointerReg, stack_min); 261 262 tc->pcState(getStartPC()); 263 264 //Align the "stack_min" to a page boundary. 265 stack_min = roundDown(stack_min, pageSize); 266} 267 268PowerISA::IntReg 269PowerLiveProcess::getSyscallArg(ThreadContext *tc, int &i) 270{ 271 assert(i < 5); 272 return tc->readIntReg(ArgumentReg0 + i++); 273} 274 275void 276PowerLiveProcess::setSyscallArg(ThreadContext *tc, 277 int i, PowerISA::IntReg val) 278{ 279 assert(i < 5); 280 tc->setIntReg(ArgumentReg0 + i, val); 281} 282 283void 284PowerLiveProcess::setSyscallReturn(ThreadContext *tc, SyscallReturn sysret) 285{ 286 Cr cr = tc->readIntReg(INTREG_CR); 287 if (sysret.successful()) { 288 cr.cr0.so = 0; 289 } else { 290 cr.cr0.so = 1; 291 } 292 tc->setIntReg(INTREG_CR, cr); 293 tc->setIntReg(ReturnValueReg, sysret.encodedValue()); 294} 295