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-rw-r--r--src/arch/x86/process.cc324
1 files changed, 274 insertions, 50 deletions
diff --git a/src/arch/x86/process.cc b/src/arch/x86/process.cc
index 76f0b5d04..4a61ed168 100644
--- a/src/arch/x86/process.cc
+++ b/src/arch/x86/process.cc
@@ -98,56 +98,115 @@
#include "mem/page_table.hh"
#include "mem/translating_port.hh"
#include "sim/process_impl.hh"
+#include "sim/syscall_emul.hh"
#include "sim/system.hh"
using namespace std;
using namespace X86ISA;
-M5_64_auxv_t::M5_64_auxv_t(int64_t type, int64_t val)
-{
- a_type = TheISA::htog(type);
- a_val = TheISA::htog(val);
-}
-
-X86LiveProcess::X86LiveProcess(LiveProcessParams * params,
- ObjectFile *objFile)
- : LiveProcess(params, objFile)
+static const int ReturnValueReg = INTREG_RAX;
+static const int ArgumentReg[] = {
+ INTREG_RDI,
+ INTREG_RSI,
+ INTREG_RDX,
+ //This argument register is r10 for syscalls and rcx for C.
+ INTREG_R10W,
+ //INTREG_RCX,
+ INTREG_R8W,
+ INTREG_R9W
+};
+static const int NumArgumentRegs = sizeof(ArgumentReg) / sizeof(const int);
+static const int ArgumentReg32[] = {
+ INTREG_EBX,
+ INTREG_ECX,
+ INTREG_EDX,
+ INTREG_ESI,
+ INTREG_EDI,
+};
+static const int NumArgumentRegs32 = sizeof(ArgumentReg) / sizeof(const int);
+
+X86LiveProcess::X86LiveProcess(LiveProcessParams * params, ObjectFile *objFile,
+ SyscallDesc *_syscallDescs, int _numSyscallDescs) :
+ LiveProcess(params, objFile), syscallDescs(_syscallDescs),
+ numSyscallDescs(_numSyscallDescs)
{
brk_point = objFile->dataBase() + objFile->dataSize() + objFile->bssSize();
brk_point = roundUp(brk_point, VMPageSize);
+}
- // Set pointer for next thread stack. Reserve 8M for main stack.
- next_thread_stack_base = stack_base - (8 * 1024 * 1024);
-
+X86_64LiveProcess::X86_64LiveProcess(LiveProcessParams *params,
+ ObjectFile *objFile, SyscallDesc *_syscallDescs,
+ int _numSyscallDescs) :
+ X86LiveProcess(params, objFile, _syscallDescs, _numSyscallDescs)
+{
// 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)0x7FFFFFFFF000ULL;
+ // Set pointer for next thread stack. Reserve 8M for main stack.
+ next_thread_stack_base = stack_base - (8 * 1024 * 1024);
+
// Set up region for mmaps. This was determined empirically and may not
// always be correct.
mmap_start = mmap_end = (Addr)0x2aaaaaaab000ULL;
}
-void X86LiveProcess::handleTrap(int trapNum, ThreadContext *tc)
+void
+I386LiveProcess::syscall(int64_t callnum, ThreadContext *tc)
{
- switch(trapNum)
- {
- default:
- panic("Unimplemented trap to operating system: trap number %#x.\n", trapNum);
+ Addr eip = tc->readPC();
+ if (eip >= vsyscallPage.base &&
+ eip < vsyscallPage.base + vsyscallPage.size) {
+ tc->setNextPC(vsyscallPage.base + vsyscallPage.vsysexitOffset);
}
+ X86LiveProcess::syscall(callnum, tc);
+}
+
+
+I386LiveProcess::I386LiveProcess(LiveProcessParams *params,
+ ObjectFile *objFile, SyscallDesc *_syscallDescs,
+ int _numSyscallDescs) :
+ X86LiveProcess(params, objFile, _syscallDescs, _numSyscallDescs)
+{
+ _gdtStart = 0x100000000;
+ _gdtSize = VMPageSize;
+
+ vsyscallPage.base = 0xffffe000ULL;
+ vsyscallPage.size = VMPageSize;
+ vsyscallPage.vsyscallOffset = 0x400;
+ vsyscallPage.vsysexitOffset = 0x410;
+
+ stack_base = vsyscallPage.base;
+
+ // Set pointer for next thread stack. Reserve 8M for main stack.
+ next_thread_stack_base = stack_base - (8 * 1024 * 1024);
+
+ // Set up region for mmaps. This was determined empirically and may not
+ // always be correct.
+ mmap_start = mmap_end = (Addr)0xf7ffd000ULL;
+}
+
+SyscallDesc*
+X86LiveProcess::getDesc(int callnum)
+{
+ if (callnum < 0 || callnum >= numSyscallDescs)
+ return NULL;
+ return &syscallDescs[callnum];
}
void
-X86LiveProcess::startup()
+X86_64LiveProcess::startup()
{
+ LiveProcess::startup();
+
if (checkpointRestored)
return;
- argsInit(sizeof(IntReg), VMPageSize);
+ argsInit(sizeof(uint64_t), VMPageSize);
- for (int i = 0; i < threadContexts.size(); i++) {
- ThreadContext * tc = threadContexts[i];
+ for (int i = 0; i < contextIds.size(); i++) {
+ ThreadContext * tc = system->getThreadContext(contextIds[i]);
SegAttr dataAttr = 0;
dataAttr.writable = 1;
@@ -203,10 +262,122 @@ X86LiveProcess::startup()
}
void
-X86LiveProcess::argsInit(int intSize, int pageSize)
+I386LiveProcess::startup()
+{
+ LiveProcess::startup();
+
+ if (checkpointRestored)
+ return;
+
+ argsInit(sizeof(uint32_t), VMPageSize);
+
+ /*
+ * Set up a GDT for this process. The whole GDT wouldn't really be for
+ * this process, but the only parts we care about are.
+ */
+ pTable->allocate(_gdtStart, _gdtSize);
+ uint64_t zero = 0;
+ assert(_gdtSize % sizeof(zero) == 0);
+ for (Addr gdtCurrent = _gdtStart;
+ gdtCurrent < _gdtStart + _gdtSize; gdtCurrent += sizeof(zero)) {
+ initVirtMem->write(gdtCurrent, zero);
+ }
+
+ // Set up the vsyscall page for this process.
+ pTable->allocate(vsyscallPage.base, vsyscallPage.size);
+ uint8_t vsyscallBlob[] = {
+ 0x51, // push %ecx
+ 0x52, // push %edp
+ 0x55, // push %ebp
+ 0x89, 0xe5, // mov %esp, %ebp
+ 0x0f, 0x34 // sysenter
+ };
+ initVirtMem->writeBlob(vsyscallPage.base + vsyscallPage.vsyscallOffset,
+ vsyscallBlob, sizeof(vsyscallBlob));
+
+ uint8_t vsysexitBlob[] = {
+ 0x5d, // pop %ebp
+ 0x5a, // pop %edx
+ 0x59, // pop %ecx
+ 0xc3 // ret
+ };
+ initVirtMem->writeBlob(vsyscallPage.base + vsyscallPage.vsysexitOffset,
+ vsysexitBlob, sizeof(vsysexitBlob));
+
+ for (int i = 0; i < contextIds.size(); i++) {
+ ThreadContext * tc = system->getThreadContext(contextIds[i]);
+
+ SegAttr dataAttr = 0;
+ dataAttr.writable = 1;
+ dataAttr.readable = 1;
+ dataAttr.expandDown = 0;
+ dataAttr.dpl = 3;
+ dataAttr.defaultSize = 1;
+ dataAttr.longMode = 0;
+
+ //Initialize the segment registers.
+ for(int seg = 0; seg < NUM_SEGMENTREGS; seg++) {
+ tc->setMiscRegNoEffect(MISCREG_SEG_BASE(seg), 0);
+ tc->setMiscRegNoEffect(MISCREG_SEG_EFF_BASE(seg), 0);
+ tc->setMiscRegNoEffect(MISCREG_SEG_ATTR(seg), dataAttr);
+ tc->setMiscRegNoEffect(MISCREG_SEG_SEL(seg), 0xB);
+ tc->setMiscRegNoEffect(MISCREG_SEG_LIMIT(seg), (uint32_t)(-1));
+ }
+
+ SegAttr csAttr = 0;
+ csAttr.writable = 0;
+ csAttr.readable = 1;
+ csAttr.expandDown = 0;
+ csAttr.dpl = 3;
+ csAttr.defaultSize = 1;
+ csAttr.longMode = 0;
+
+ tc->setMiscRegNoEffect(MISCREG_CS_ATTR, csAttr);
+
+ tc->setMiscRegNoEffect(MISCREG_TSG_BASE, _gdtStart);
+ tc->setMiscRegNoEffect(MISCREG_TSG_EFF_BASE, _gdtStart);
+ tc->setMiscRegNoEffect(MISCREG_TSG_LIMIT, _gdtStart + _gdtSize - 1);
+
+ // Set the LDT selector to 0 to deactivate it.
+ tc->setMiscRegNoEffect(MISCREG_TSL, 0);
+
+ //Set up the registers that describe the operating mode.
+ CR0 cr0 = 0;
+ cr0.pg = 1; // Turn on paging.
+ cr0.cd = 0; // Don't disable caching.
+ cr0.nw = 0; // This is bit is defined to be ignored.
+ cr0.am = 0; // No alignment checking
+ cr0.wp = 0; // Supervisor mode can write read only pages
+ cr0.ne = 1;
+ cr0.et = 1; // This should always be 1
+ cr0.ts = 0; // We don't do task switching, so causing fp exceptions
+ // would be pointless.
+ cr0.em = 0; // Allow x87 instructions to execute natively.
+ cr0.mp = 1; // This doesn't really matter, but the manual suggests
+ // setting it to one.
+ cr0.pe = 1; // We're definitely in protected mode.
+ tc->setMiscReg(MISCREG_CR0, cr0);
+
+ Efer efer = 0;
+ efer.sce = 1; // Enable system call extensions.
+ efer.lme = 1; // Enable long mode.
+ efer.lma = 0; // Deactivate long mode.
+ efer.nxe = 1; // Enable nx support.
+ efer.svme = 0; // Disable svm support for now. It isn't implemented.
+ efer.ffxsr = 1; // Turn on fast fxsave and fxrstor.
+ tc->setMiscReg(MISCREG_EFER, efer);
+ }
+}
+
+template<class IntType>
+void
+X86LiveProcess::argsInit(int pageSize,
+ std::vector<AuxVector<IntType> > extraAuxvs)
{
- typedef M5_64_auxv_t auxv_t;
- Process::startup();
+ int intSize = sizeof(IntType);
+
+ typedef AuxVector<IntType> auxv_t;
+ std::vector<auxv_t> auxv = extraAuxvs;
string filename;
if(argv.size() < 1)
@@ -399,35 +570,35 @@ X86LiveProcess::argsInit(int intSize, int pageSize)
roundUp(stack_size, pageSize));
// map out initial stack contents
- Addr sentry_base = stack_base - sentry_size;
- Addr file_name_base = sentry_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 aux_data_base = arg_data_base - info_block_padding - aux_data_size;
- 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;
-
- DPRINTF(X86, "The addresses of items on the initial stack:\n");
- 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);
- DPRINTF(X86, "0x%x - argc \n", argc_base);
- DPRINTF(X86, "0x%x - stack min\n", stack_min);
+ IntType sentry_base = stack_base - sentry_size;
+ IntType file_name_base = sentry_base - file_name_size;
+ IntType env_data_base = file_name_base - env_data_size;
+ IntType arg_data_base = env_data_base - arg_data_size;
+ IntType aux_data_base = arg_data_base - info_block_padding - aux_data_size;
+ IntType auxv_array_base = aux_data_base - aux_array_size - aux_padding;
+ IntType envp_array_base = auxv_array_base - envp_array_size;
+ IntType argv_array_base = envp_array_base - argv_array_size;
+ IntType argc_base = argv_array_base - argc_size;
+
+ DPRINTF(Stack, "The addresses of items on the initial stack:\n");
+ DPRINTF(Stack, "0x%x - file name\n", file_name_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 - aux data\n", aux_data_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
// figure out argc
- uint64_t argc = argv.size();
- uint64_t guestArgc = TheISA::htog(argc);
+ IntType argc = argv.size();
+ IntType guestArgc = X86ISA::htog(argc);
//Write out the sentry void *
- uint64_t sentry_NULL = 0;
+ IntType sentry_NULL = 0;
initVirtMem->writeBlob(sentry_base,
(uint8_t*)&sentry_NULL, sentry_size);
@@ -458,17 +629,70 @@ X86LiveProcess::argsInit(int intSize, int pageSize)
initVirtMem->writeBlob(argc_base, (uint8_t*)&guestArgc, intSize);
+ ThreadContext *tc = system->getThreadContext(contextIds[0]);
//Set the stack pointer register
- threadContexts[0]->setIntReg(StackPointerReg, stack_min);
+ tc->setIntReg(StackPointerReg, stack_min);
Addr prog_entry = objFile->entryPoint();
// There doesn't need to be any segment base added in since we're dealing
// with the flat segmentation model.
- threadContexts[0]->setPC(prog_entry);
- threadContexts[0]->setNextPC(prog_entry + sizeof(MachInst));
+ tc->setPC(prog_entry);
+ tc->setNextPC(prog_entry + sizeof(MachInst));
//Align the "stack_min" to a page boundary.
stack_min = roundDown(stack_min, pageSize);
// num_processes++;
}
+
+void
+X86_64LiveProcess::argsInit(int intSize, int pageSize)
+{
+ std::vector<AuxVector<uint64_t> > extraAuxvs;
+ X86LiveProcess::argsInit<uint64_t>(pageSize, extraAuxvs);
+}
+
+void
+I386LiveProcess::argsInit(int intSize, int pageSize)
+{
+ std::vector<AuxVector<uint32_t> > extraAuxvs;
+ //Tell the binary where the vsyscall part of the vsyscall page is.
+ extraAuxvs.push_back(AuxVector<uint32_t>(0x20,
+ vsyscallPage.base + vsyscallPage.vsyscallOffset));
+ extraAuxvs.push_back(AuxVector<uint32_t>(0x21, vsyscallPage.base));
+ X86LiveProcess::argsInit<uint32_t>(pageSize, extraAuxvs);
+}
+
+void
+X86LiveProcess::setSyscallReturn(ThreadContext *tc, SyscallReturn return_value)
+{
+ tc->setIntReg(INTREG_RAX, return_value.value());
+}
+
+X86ISA::IntReg
+X86_64LiveProcess::getSyscallArg(ThreadContext *tc, int i)
+{
+ assert(i < NumArgumentRegs);
+ return tc->readIntReg(ArgumentReg[i]);
+}
+
+void
+X86_64LiveProcess::setSyscallArg(ThreadContext *tc, int i, X86ISA::IntReg val)
+{
+ assert(i < NumArgumentRegs);
+ return tc->setIntReg(ArgumentReg[i], val);
+}
+
+X86ISA::IntReg
+I386LiveProcess::getSyscallArg(ThreadContext *tc, int i)
+{
+ assert(i < NumArgumentRegs32);
+ return tc->readIntReg(ArgumentReg32[i]);
+}
+
+void
+I386LiveProcess::setSyscallArg(ThreadContext *tc, int i, X86ISA::IntReg val)
+{
+ assert(i < NumArgumentRegs);
+ return tc->setIntReg(ArgumentReg[i], val);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-10-24 15:36:59 +0000