ArmLiveProcess::ArmLiveProcess(LiveProcessParams *params, ObjectFile *objFile)
: LiveProcess(params, objFile)
{
- stack_base = 0xc0000000L;
+ stack_base = 0xbf000000L;
// Set pointer for next thread stack. Reserve 8M for main stack.
next_thread_stack_base = stack_base - (8 * 1024 * 1024);
void
ArmLiveProcess::argsInit(int intSize, int pageSize)
{
+ typedef AuxVector<uint32_t> auxv_t;
+ std::vector<auxv_t> 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 ARM architecture
Process::startup();
// load object file into target memory
objFile->loadSections(initVirtMem);
- // Calculate how much space we need for arg & env arrays.
- int argv_array_size = intSize * (argv.size() + 1);
- int envp_array_size = intSize * (envp.size() + 1);
- int arg_data_size = 0;
- for (int i = 0; i < argv.size(); ++i) {
- arg_data_size += argv[i].size() + 1;
+ enum ArmCpuFeature {
+ Arm_Swp = 1 << 0,
+ Arm_Half = 1 << 1,
+ Arm_Thumb = 1 << 2,
+ Arm_26Bit = 1 << 3,
+ Arm_FastMult = 1 << 4,
+ Arm_Fpa = 1 << 5,
+ Arm_Vfp = 1 << 6,
+ Arm_Edsp = 1 << 7,
+ Arm_Java = 1 << 8,
+ Arm_Iwmmxt = 1 << 9,
+ Arm_Crunch = 1 << 10
+ };
+
+ //Setup the auxilliary vectors. These will already have endian conversion.
+ //Auxilliary vectors are loaded only for elf formatted executables.
+ ElfObject * elfObject = dynamic_cast<ElfObject *>(objFile);
+ if (elfObject) {
+ uint32_t features =
+ Arm_Swp |
+ Arm_Half |
+ Arm_Thumb |
+// Arm_26Bit |
+ Arm_FastMult |
+// Arm_Fpa |
+ Arm_Vfp |
+ Arm_Edsp |
+ Arm_Java |
+// Arm_Iwmmxt |
+// Arm_Crunch |
+ 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, ArmISA::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 space_needed =
- argv_array_size + envp_array_size + arg_data_size + env_data_size;
- if (space_needed < 16*1024)
- space_needed = 16*1024;
+ 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;
- // set bottom of stack
stack_min = stack_base - space_needed;
- // align it
- stack_min = roundDown(stack_min, pageSize);
+ stack_min = roundDown(stack_min, align);
stack_size = stack_base - stack_min;
+
// map memory
- pTable->allocate(stack_min, roundUp(stack_size, pageSize));
+ pTable->allocate(roundDown(stack_min, pageSize),
+ roundUp(stack_size, pageSize));
// map out initial stack contents
- Addr argv_array_base = stack_min + intSize; // room for argc
- Addr envp_array_base = argv_array_base + argv_array_size;
- Addr arg_data_base = envp_array_base + envp_array_size;
- Addr env_data_base = arg_data_base + arg_data_size;
+ 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
- uint64_t argc = argv.size();
- if (intSize == 8)
- argc = htog((uint64_t)argc);
- else if (intSize == 4)
- argc = htog((uint32_t)argc);
- else
- panic("Unknown int size");
- initVirtMem->writeBlob(stack_min, (uint8_t*)&argc, intSize);
+ // figure out argc
+ uint32_t argc = argv.size();
+ uint32_t guestArgc = ArmISA::htog(argc);
- copyStringArray32(argv, argv_array_base, arg_data_base, initVirtMem);
- copyStringArray32(envp, envp_array_base, env_data_base, initVirtMem);
+ //Write out the sentry void *
+ uint32_t sentry_NULL = 0;
+ initVirtMem->writeBlob(sentry_base,
+ (uint8_t*)&sentry_NULL, sentry_size);
- /*
- //uint8_t insns[] = {0xe5, 0x9f, 0x00, 0x08, 0xe1, 0xa0, 0xf0, 0x0e};
- uint8_t insns[] = {0x08, 0x00, 0x9f, 0xe5, 0x0e, 0xf0, 0xa0, 0xe1};
+ //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());
+ }
+ }
- initVirtMem->writeBlob(0xffff0fe0, insns, 8);
- */
+ //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);
- ThreadContext *tc = system->getThreadContext(contextIds[0]);
+ 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);
- tc->setIntReg(ArgumentReg1, argc);
- tc->setIntReg(ArgumentReg2, argv_array_base);
+ ThreadContext *tc = system->getThreadContext(contextIds[0]);
+ //Set the stack pointer register
tc->setIntReg(StackPointerReg, stack_min);
+ //A pointer to a function to run when the program exits. We'll set this
+ //to zero explicitly to make sure this isn't used.
+ tc->setIntReg(ArgumentReg0, 0);
+ //Set argument regs 1 and 2 to argv[0] and envp[0] respectively
+ if (argv.size() > 0) {
+ tc->setIntReg(ArgumentReg1, arg_data_base + arg_data_size -
+ argv[argv.size() - 1].size() - 1);
+ } else {
+ tc->setIntReg(ArgumentReg1, 0);
+ }
+ if (envp.size() > 0) {
+ tc->setIntReg(ArgumentReg2, env_data_base + env_data_size -
+ envp[envp.size() - 1].size() - 1);
+ } else {
+ tc->setIntReg(ArgumentReg2, 0);
+ }
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);
}
ArmISA::IntReg
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