process.cc revision 11793
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/system.hh" 45 46using namespace std; 47using namespace PowerISA; 48 49PowerLiveProcess::PowerLiveProcess(LiveProcessParams *params, 50 ObjectFile *objFile) 51 : LiveProcess(params, objFile) 52{ 53 stack_base = 0xbf000000L; 54 55 // Set pointer for next thread stack. Reserve 8M for main stack. 56 next_thread_stack_base = stack_base - (8 * 1024 * 1024); 57 58 // Set up break point (Top of Heap) 59 brk_point = objFile->dataBase() + objFile->dataSize() + objFile->bssSize(); 60 brk_point = roundUp(brk_point, PageBytes); 61 62 // Set up region for mmaps. For now, start at bottom of kuseg space. 63 mmap_end = 0x70000000L; 64} 65 66void 67PowerLiveProcess::initState() 68{ 69 Process::initState(); 70 71 argsInit(MachineBytes, PageBytes); 72} 73 74void 75PowerLiveProcess::argsInit(int intSize, int pageSize) 76{ 77 typedef AuxVector<uint32_t> auxv_t; 78 std::vector<auxv_t> auxv; 79 80 string filename; 81 if (argv.size() < 1) 82 filename = ""; 83 else 84 filename = argv[0]; 85 86 //We want 16 byte alignment 87 uint64_t align = 16; 88 89 // Patch the ld_bias for dynamic executables. 90 updateBias(); 91 92 // load object file into target memory 93 objFile->loadSections(initVirtMem); 94 95 //Setup the auxilliary vectors. These will already have endian conversion. 96 //Auxilliary vectors are loaded only for elf formatted executables. 97 ElfObject * elfObject = dynamic_cast<ElfObject *>(objFile); 98 if (elfObject) { 99 uint32_t features = 0; 100 101 //Bits which describe the system hardware capabilities 102 //XXX Figure out what these should be 103 auxv.push_back(auxv_t(M5_AT_HWCAP, features)); 104 //The system page size 105 auxv.push_back(auxv_t(M5_AT_PAGESZ, PowerISA::PageBytes)); 106 //Frequency at which times() increments 107 auxv.push_back(auxv_t(M5_AT_CLKTCK, 0x64)); 108 // For statically linked executables, this is the virtual address of the 109 // program header tables if they appear in the executable image 110 auxv.push_back(auxv_t(M5_AT_PHDR, elfObject->programHeaderTable())); 111 // This is the size of a program header entry from the elf file. 112 auxv.push_back(auxv_t(M5_AT_PHENT, elfObject->programHeaderSize())); 113 // This is the number of program headers from the original elf file. 114 auxv.push_back(auxv_t(M5_AT_PHNUM, elfObject->programHeaderCount())); 115 // This is the base address of the ELF interpreter; it should be 116 // zero for static executables or contain the base address for 117 // dynamic executables. 118 auxv.push_back(auxv_t(M5_AT_BASE, getBias())); 119 //XXX Figure out what this should be. 120 auxv.push_back(auxv_t(M5_AT_FLAGS, 0)); 121 //The entry point to the program 122 auxv.push_back(auxv_t(M5_AT_ENTRY, objFile->entryPoint())); 123 //Different user and group IDs 124 auxv.push_back(auxv_t(M5_AT_UID, uid())); 125 auxv.push_back(auxv_t(M5_AT_EUID, euid())); 126 auxv.push_back(auxv_t(M5_AT_GID, gid())); 127 auxv.push_back(auxv_t(M5_AT_EGID, egid())); 128 //Whether to enable "secure mode" in the executable 129 auxv.push_back(auxv_t(M5_AT_SECURE, 0)); 130 //The filename of the program 131 auxv.push_back(auxv_t(M5_AT_EXECFN, 0)); 132 //The string "v51" with unknown meaning 133 auxv.push_back(auxv_t(M5_AT_PLATFORM, 0)); 134 } 135 136 //Figure out how big the initial stack nedes to be 137 138 // A sentry NULL void pointer at the top of the stack. 139 int sentry_size = intSize; 140 141 string platform = "v51"; 142 int platform_size = platform.size() + 1; 143 144 // The aux vectors are put on the stack in two groups. The first group are 145 // the vectors that are generated as the elf is loaded. The second group 146 // are the ones that were computed ahead of time and include the platform 147 // string. 148 int aux_data_size = filename.size() + 1; 149 150 int env_data_size = 0; 151 for (int i = 0; i < envp.size(); ++i) { 152 env_data_size += envp[i].size() + 1; 153 } 154 int arg_data_size = 0; 155 for (int i = 0; i < argv.size(); ++i) { 156 arg_data_size += argv[i].size() + 1; 157 } 158 159 int info_block_size = 160 sentry_size + env_data_size + arg_data_size + 161 aux_data_size + platform_size; 162 163 //Each auxilliary vector is two 4 byte words 164 int aux_array_size = intSize * 2 * (auxv.size() + 1); 165 166 int envp_array_size = intSize * (envp.size() + 1); 167 int argv_array_size = intSize * (argv.size() + 1); 168 169 int argc_size = intSize; 170 171 //Figure out the size of the contents of the actual initial frame 172 int frame_size = 173 info_block_size + 174 aux_array_size + 175 envp_array_size + 176 argv_array_size + 177 argc_size; 178 179 //There needs to be padding after the auxiliary vector data so that the 180 //very bottom of the stack is aligned properly. 181 int partial_size = frame_size; 182 int aligned_partial_size = roundUp(partial_size, align); 183 int aux_padding = aligned_partial_size - partial_size; 184 185 int space_needed = frame_size + aux_padding; 186 187 stack_min = stack_base - space_needed; 188 stack_min = roundDown(stack_min, align); 189 stack_size = stack_base - stack_min; 190 191 // map memory 192 allocateMem(roundDown(stack_min, pageSize), roundUp(stack_size, pageSize)); 193 194 // map out initial stack contents 195 uint32_t sentry_base = stack_base - sentry_size; 196 uint32_t aux_data_base = sentry_base - aux_data_size; 197 uint32_t env_data_base = aux_data_base - env_data_size; 198 uint32_t arg_data_base = env_data_base - arg_data_size; 199 uint32_t platform_base = arg_data_base - platform_size; 200 uint32_t auxv_array_base = platform_base - aux_array_size - aux_padding; 201 uint32_t envp_array_base = auxv_array_base - envp_array_size; 202 uint32_t argv_array_base = envp_array_base - argv_array_size; 203 uint32_t argc_base = argv_array_base - argc_size; 204 205 DPRINTF(Stack, "The addresses of items on the initial stack:\n"); 206 DPRINTF(Stack, "0x%x - aux data\n", aux_data_base); 207 DPRINTF(Stack, "0x%x - env data\n", env_data_base); 208 DPRINTF(Stack, "0x%x - arg data\n", arg_data_base); 209 DPRINTF(Stack, "0x%x - platform base\n", platform_base); 210 DPRINTF(Stack, "0x%x - auxv array\n", auxv_array_base); 211 DPRINTF(Stack, "0x%x - envp array\n", envp_array_base); 212 DPRINTF(Stack, "0x%x - argv array\n", argv_array_base); 213 DPRINTF(Stack, "0x%x - argc \n", argc_base); 214 DPRINTF(Stack, "0x%x - stack min\n", stack_min); 215 216 // write contents to stack 217 218 // figure out argc 219 uint32_t argc = argv.size(); 220 uint32_t guestArgc = PowerISA::htog(argc); 221 222 //Write out the sentry void * 223 uint32_t sentry_NULL = 0; 224 initVirtMem.writeBlob(sentry_base, 225 (uint8_t*)&sentry_NULL, sentry_size); 226 227 //Fix up the aux vectors which point to other data 228 for (int i = auxv.size() - 1; i >= 0; i--) { 229 if (auxv[i].a_type == M5_AT_PLATFORM) { 230 auxv[i].a_val = platform_base; 231 initVirtMem.writeString(platform_base, platform.c_str()); 232 } else if (auxv[i].a_type == M5_AT_EXECFN) { 233 auxv[i].a_val = aux_data_base; 234 initVirtMem.writeString(aux_data_base, filename.c_str()); 235 } 236 } 237 238 //Copy the aux stuff 239 for (int x = 0; x < auxv.size(); x++) 240 { 241 initVirtMem.writeBlob(auxv_array_base + x * 2 * intSize, 242 (uint8_t*)&(auxv[x].a_type), intSize); 243 initVirtMem.writeBlob(auxv_array_base + (x * 2 + 1) * intSize, 244 (uint8_t*)&(auxv[x].a_val), intSize); 245 } 246 //Write out the terminating zeroed auxilliary vector 247 const uint64_t zero = 0; 248 initVirtMem.writeBlob(auxv_array_base + 2 * intSize * auxv.size(), 249 (uint8_t*)&zero, 2 * intSize); 250 251 copyStringArray(envp, envp_array_base, env_data_base, initVirtMem); 252 copyStringArray(argv, argv_array_base, arg_data_base, initVirtMem); 253 254 initVirtMem.writeBlob(argc_base, (uint8_t*)&guestArgc, intSize); 255 256 ThreadContext *tc = system->getThreadContext(contextIds[0]); 257 258 //Set the stack pointer register 259 tc->setIntReg(StackPointerReg, stack_min); 260 261 tc->pcState(getStartPC()); 262 263 //Align the "stack_min" to a page boundary. 264 stack_min = roundDown(stack_min, pageSize); 265} 266 267PowerISA::IntReg 268PowerLiveProcess::getSyscallArg(ThreadContext *tc, int &i) 269{ 270 assert(i < 5); 271 return tc->readIntReg(ArgumentReg0 + i++); 272} 273 274void 275PowerLiveProcess::setSyscallArg(ThreadContext *tc, 276 int i, PowerISA::IntReg val) 277{ 278 assert(i < 5); 279 tc->setIntReg(ArgumentReg0 + i, val); 280} 281 282void 283PowerLiveProcess::setSyscallReturn(ThreadContext *tc, SyscallReturn sysret) 284{ 285 Cr cr = tc->readIntReg(INTREG_CR); 286 if (sysret.successful()) { 287 cr.cr0.so = 0; 288 } else { 289 cr.cr0.so = 1; 290 } 291 tc->setIntReg(INTREG_CR, cr); 292 tc->setIntReg(ReturnValueReg, sysret.encodedValue()); 293} 294