+ TheISA::PCState pc = tc->pcState();
+ Addr eip = pc.pc();
+ if (eip >= vsyscallPage.base &&
+ eip < vsyscallPage.base + vsyscallPage.size) {
+ pc.npc(vsyscallPage.base + vsyscallPage.vsysexitOffset);
+ tc->pcState(pc);
+ }
+ X86LiveProcess::syscall(callnum, tc);
+}
+
+
+I386LiveProcess::I386LiveProcess(LiveProcessParams *params,
+ ObjectFile *objFile, SyscallDesc *_syscallDescs,
+ int _numSyscallDescs) :
+ X86LiveProcess(params, objFile, _syscallDescs, _numSyscallDescs)
+{
+ _gdtStart = ULL(0xffffd000);
+ _gdtSize = VMPageSize;
+
+ vsyscallPage.base = 0xffffe000ULL;
+ vsyscallPage.size = VMPageSize;
+ vsyscallPage.vsyscallOffset = 0x400;
+ vsyscallPage.vsysexitOffset = 0x410;
+
+ stack_base = _gdtStart;
+
+ // 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)0xf7ffe000ULL;
+}
+
+SyscallDesc*
+X86LiveProcess::getDesc(int callnum)
+{
+ if (callnum < 0 || callnum >= numSyscallDescs)
+ return NULL;
+ return &syscallDescs[callnum];
+}
+
+void
+X86_64LiveProcess::initState()
+{
+ X86LiveProcess::initState();
+
+ argsInit(sizeof(uint64_t), VMPageSize);
+
+ // Set up the vsyscall page for this process.
+ allocateMem(vsyscallPage.base, vsyscallPage.size);
+ uint8_t vtimeBlob[] = {
+ 0x48,0xc7,0xc0,0xc9,0x00,0x00,0x00, // mov $0xc9,%rax
+ 0x0f,0x05, // syscall
+ 0xc3 // retq
+ };
+ initVirtMem.writeBlob(vsyscallPage.base + vsyscallPage.vtimeOffset,
+ vtimeBlob, sizeof(vtimeBlob));
+
+ uint8_t vgettimeofdayBlob[] = {
+ 0x48,0xc7,0xc0,0x60,0x00,0x00,0x00, // mov $0x60,%rax
+ 0x0f,0x05, // syscall
+ 0xc3 // retq
+ };
+ initVirtMem.writeBlob(vsyscallPage.base + vsyscallPage.vgettimeofdayOffset,
+ vgettimeofdayBlob, sizeof(vgettimeofdayBlob));
+
+ for (int i = 0; i < contextIds.size(); i++) {
+ ThreadContext * tc = system->getThreadContext(contextIds[i]);
+
+ SegAttr dataAttr = 0;
+ dataAttr.dpl = 3;
+ dataAttr.unusable = 0;
+ dataAttr.defaultSize = 1;
+ dataAttr.longMode = 1;
+ dataAttr.avl = 0;
+ dataAttr.granularity = 1;
+ dataAttr.present = 1;
+ dataAttr.type = 3;
+ dataAttr.writable = 1;
+ dataAttr.readable = 1;
+ dataAttr.expandDown = 0;
+ dataAttr.system = 1;
+
+ //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);
+ }
+
+ SegAttr csAttr = 0;
+ csAttr.dpl = 3;
+ csAttr.unusable = 0;
+ csAttr.defaultSize = 0;
+ csAttr.longMode = 1;
+ csAttr.avl = 0;
+ csAttr.granularity = 1;
+ csAttr.present = 1;
+ csAttr.type = 10;
+ csAttr.writable = 0;
+ csAttr.readable = 1;
+ csAttr.expandDown = 0;
+ csAttr.system = 1;
+
+ tc->setMiscRegNoEffect(MISCREG_CS_ATTR, csAttr);
+
+ Efer efer = 0;
+ efer.sce = 1; // Enable system call extensions.
+ efer.lme = 1; // Enable long mode.
+ efer.lma = 1; // Activate 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);
+
+ //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);
+
+ tc->setMiscReg(MISCREG_MXCSR, 0x1f80);