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Diffstat (limited to 'src/arch/x86/process.cc')
-rw-r--r--src/arch/x86/process.cc167
1 files changed, 118 insertions, 49 deletions
diff --git a/src/arch/x86/process.cc b/src/arch/x86/process.cc
index ff23be339..6d30e53e3 100644
--- a/src/arch/x86/process.cc
+++ b/src/arch/x86/process.cc
@@ -125,7 +125,7 @@ X86LiveProcess::X86LiveProcess(const std::string &nm, ObjectFile *objFile,
// Set up stack. On X86_64 Linux, stack goes from the top of memory
// downward, less the hole for the kernel address space plus one page
// for undertermined purposes.
- stack_base = (Addr)0x7FFFFFFF000ULL;
+ stack_base = (Addr)0x7FFFFFFFF000ULL;
// Set up region for mmaps. Tru64 seems to start just above 0 and
// grow up from there.
@@ -166,36 +166,49 @@ X86LiveProcess::argsInit(int intSize, int pageSize)
else
filename = argv[0];
- Addr alignmentMask = ~(intSize - 1);
+ //We want 16 byte alignment
+ Addr alignmentMask = ~mask(4);
// load object file into target memory
objFile->loadSections(initVirtMem);
- //These are the auxilliary vector types
- enum auxTypes
- {
- X86_AT_NULL = 0,
- X86_AT_IGNORE = 1,
- X86_AT_EXECFD = 2,
- X86_AT_PHDR = 3,
- X86_AT_PHENT = 4,
- X86_AT_PHNUM = 5,
- X86_AT_PAGESZ = 6,
- X86_AT_BASE = 7,
- X86_AT_FLAGS = 8,
- X86_AT_ENTRY = 9,
- X86_AT_NOTELF = 10,
- X86_AT_UID = 11,
- X86_AT_EUID = 12,
- X86_AT_GID = 13,
- X86_AT_EGID = 14,
- X86_AT_PLATFORM = 15,
- X86_AT_HWCAP = 16,
- X86_AT_CLKTCK = 17,
-
- X86_AT_SECURE = 13,
-
- X86_AT_VECTOR_SIZE = 44
+ enum X86CpuFeature {
+ X86_OnboardFPU = 1 << 0,
+ X86_VirtualModeExtensions = 1 << 1,
+ X86_DebuggingExtensions = 1 << 2,
+ X86_PageSizeExtensions = 1 << 3,
+
+ X86_TimeStampCounter = 1 << 4,
+ X86_ModelSpecificRegisters = 1 << 5,
+ X86_PhysicalAddressExtensions = 1 << 6,
+ X86_MachineCheckExtensions = 1 << 7,
+
+ X86_CMPXCHG8Instruction = 1 << 8,
+ X86_OnboardAPIC = 1 << 9,
+ X86_SYSENTER_SYSEXIT = 1 << 11,
+
+ X86_MemoryTypeRangeRegisters = 1 << 12,
+ X86_PageGlobalEnable = 1 << 13,
+ X86_MachineCheckArchitecture = 1 << 14,
+ X86_CMOVInstruction = 1 << 15,
+
+ X86_PageAttributeTable = 1 << 16,
+ X86_36BitPSEs = 1 << 17,
+ X86_ProcessorSerialNumber = 1 << 18,
+ X86_CLFLUSHInstruction = 1 << 19,
+
+ X86_DebugTraceStore = 1 << 21,
+ X86_ACPIViaMSR = 1 << 22,
+ X86_MultimediaExtensions = 1 << 23,
+
+ X86_FXSAVE_FXRSTOR = 1 << 24,
+ X86_StreamingSIMDExtensions = 1 << 25,
+ X86_StreamingSIMDExtensions2 = 1 << 26,
+ X86_CPUSelfSnoop = 1 << 27,
+
+ X86_HyperThreading = 1 << 28,
+ X86_AutomaticClockControl = 1 << 29,
+ X86_IA64Processor = 1 << 30
};
//Setup the auxilliary vectors. These will already have endian conversion.
@@ -203,39 +216,71 @@ X86LiveProcess::argsInit(int intSize, int pageSize)
ElfObject * elfObject = dynamic_cast<ElfObject *>(objFile);
if(elfObject)
{
+ uint64_t features =
+ X86_OnboardFPU |
+ X86_VirtualModeExtensions |
+ X86_DebuggingExtensions |
+ X86_PageSizeExtensions |
+ X86_TimeStampCounter |
+ X86_ModelSpecificRegisters |
+ X86_PhysicalAddressExtensions |
+ X86_MachineCheckExtensions |
+ X86_CMPXCHG8Instruction |
+ X86_OnboardAPIC |
+ X86_SYSENTER_SYSEXIT |
+ X86_MemoryTypeRangeRegisters |
+ X86_PageGlobalEnable |
+ X86_MachineCheckArchitecture |
+ X86_CMOVInstruction |
+ X86_PageAttributeTable |
+ X86_36BitPSEs |
+// X86_ProcessorSerialNumber |
+ X86_CLFLUSHInstruction |
+// X86_DebugTraceStore |
+// X86_ACPIViaMSR |
+ X86_MultimediaExtensions |
+ X86_FXSAVE_FXRSTOR |
+ X86_StreamingSIMDExtensions |
+ X86_StreamingSIMDExtensions2 |
+// X86_CPUSelfSnoop |
+// X86_HyperThreading |
+// X86_AutomaticClockControl |
+// X86_IA64Processor |
+ 0;
+
//Bits which describe the system hardware capabilities
//XXX Figure out what these should be
- auxv.push_back(auxv_t(X86_AT_HWCAP, 0));
+ auxv.push_back(auxv_t(M5_AT_HWCAP, features));
//The system page size
- auxv.push_back(auxv_t(X86_AT_PAGESZ, X86ISA::VMPageSize));
+ auxv.push_back(auxv_t(M5_AT_PAGESZ, X86ISA::VMPageSize));
//Frequency at which times() increments
- auxv.push_back(auxv_t(X86_AT_CLKTCK, 100));
+ 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(X86_AT_PHDR, elfObject->programHeaderTable()));
+ 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(X86_AT_PHENT, elfObject->programHeaderSize()));
+ 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(X86_AT_PHNUM, elfObject->programHeaderCount()));
+ auxv.push_back(auxv_t(M5_AT_PHNUM, elfObject->programHeaderCount()));
//Defined to be 100 in the kernel source.
//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(X86_AT_BASE, 0));
+ auxv.push_back(auxv_t(M5_AT_BASE, 0));
//XXX Figure out what this should be.
- auxv.push_back(auxv_t(X86_AT_FLAGS, 0));
+ auxv.push_back(auxv_t(M5_AT_FLAGS, 0));
//The entry point to the program
- auxv.push_back(auxv_t(X86_AT_ENTRY, objFile->entryPoint()));
+ auxv.push_back(auxv_t(M5_AT_ENTRY, objFile->entryPoint()));
//Different user and group IDs
- auxv.push_back(auxv_t(X86_AT_UID, uid()));
- auxv.push_back(auxv_t(X86_AT_EUID, euid()));
- auxv.push_back(auxv_t(X86_AT_GID, gid()));
- auxv.push_back(auxv_t(X86_AT_EGID, egid()));
+ 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(X86_AT_SECURE, 0));
+ auxv.push_back(auxv_t(M5_AT_SECURE, 0));
//The string "x86_64" with unknown meaning
- auxv.push_back(auxv_t(X86_AT_PLATFORM, 0));
+ auxv.push_back(auxv_t(M5_AT_PLATFORM, 0));
}
//Figure out how big the initial stack needs to be
@@ -245,29 +290,39 @@ X86LiveProcess::argsInit(int intSize, int pageSize)
//This is the name of the file which is present on the initial stack
//It's purpose is to let the user space linker examine the original file.
- int file_name_size = filename.size() + 1;
+ int file_name_size = filename.size();
+
+ string platform = "x86_64";
+ int aux_data_size = platform.size() + 1;
int env_data_size = 0;
for (int i = 0; i < envp.size(); ++i) {
- env_data_size += envp[i].size() + 1;
+ env_data_size += envp[i].size();
}
int arg_data_size = 0;
for (int i = 0; i < argv.size(); ++i) {
- arg_data_size += argv[i].size() + 1;
+ arg_data_size += argv[i].size();
}
+ //The auxiliary vector data needs to be padded so it's size is a multiple
+ //of the alignment mask.
+ int aux_padding =
+ ((aux_data_size + ~alignmentMask) & alignmentMask) - aux_data_size;
+
//The info_block needs to be padded so it's size is a multiple of the
//alignment mask. Also, it appears that there needs to be at least some
//padding, so if the size is already a multiple, we need to increase it
//anyway.
int info_block_size =
- (file_name_size +
+ (mysterious_size +
+ file_name_size +
env_data_size +
arg_data_size +
- intSize) & alignmentMask;
+ ~alignmentMask) & alignmentMask;
int info_block_padding =
info_block_size -
+ mysterious_size -
file_name_size -
env_data_size -
arg_data_size;
@@ -281,8 +336,9 @@ X86LiveProcess::argsInit(int intSize, int pageSize)
int argc_size = intSize;
int space_needed =
- mysterious_size +
info_block_size +
+ aux_data_size +
+ aux_padding +
aux_array_size +
envp_array_size +
argv_array_size +
@@ -301,7 +357,8 @@ X86LiveProcess::argsInit(int intSize, int pageSize)
Addr file_name_base = mysterious_base - file_name_size;
Addr env_data_base = file_name_base - env_data_size;
Addr arg_data_base = env_data_base - arg_data_size;
- Addr auxv_array_base = arg_data_base - aux_array_size - info_block_padding;
+ Addr aux_data_base = arg_data_base - aux_data_size - info_block_padding;
+ Addr auxv_array_base = aux_data_base - aux_array_size - aux_padding;
Addr envp_array_base = auxv_array_base - envp_array_size;
Addr argv_array_base = envp_array_base - argv_array_size;
Addr argc_base = argv_array_base - argc_size;
@@ -310,6 +367,7 @@ X86LiveProcess::argsInit(int intSize, int pageSize)
DPRINTF(X86, "0x%x - file name\n", file_name_base);
DPRINTF(X86, "0x%x - env data\n", env_data_base);
DPRINTF(X86, "0x%x - arg data\n", arg_data_base);
+ DPRINTF(X86, "0x%x - aux data\n", aux_data_base);
DPRINTF(X86, "0x%x - auxv array\n", auxv_array_base);
DPRINTF(X86, "0x%x - envp array\n", envp_array_base);
DPRINTF(X86, "0x%x - argv array\n", argv_array_base);
@@ -330,6 +388,10 @@ X86LiveProcess::argsInit(int intSize, int pageSize)
//Write the file name
initVirtMem->writeString(file_name_base, filename.c_str());
+ //Fix up the aux vector which points to the "platform" string
+ assert(auxv[auxv.size() - 1].a_type = M5_AT_PLATFORM);
+ auxv[auxv.size() - 1].a_val = aux_data_base;
+
//Copy the aux stuff
for(int x = 0; x < auxv.size(); x++)
{
@@ -343,12 +405,19 @@ X86LiveProcess::argsInit(int intSize, int pageSize)
initVirtMem->writeBlob(auxv_array_base + 2 * intSize * auxv.size(),
(uint8_t*)&zero, 2 * intSize);
+ initVirtMem->writeString(aux_data_base, platform.c_str());
+
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);
//Set up the thread context to start running the process
+ //Because of the peculiarities of how syscall works, I believe
+ //a process starts with r11 containing the value of eflags or maybe r11
+ //from before the call to execve. Empirically this value is 0x200.
+ threadContexts[0]->setIntReg(INTREG_R11, 0x200);
+ //Set the stack pointer register
threadContexts[0]->setIntReg(StackPointerReg, stack_min);
Addr prog_entry = objFile->entryPoint();