diff options
Diffstat (limited to 'src/arch')
-rw-r--r-- | src/arch/x86/process.cc | 18 | ||||
-rw-r--r-- | src/arch/x86/process.hh | 9 |
2 files changed, 27 insertions, 0 deletions
diff --git a/src/arch/x86/process.cc b/src/arch/x86/process.cc index 232f07934..22030cbfa 100644 --- a/src/arch/x86/process.cc +++ b/src/arch/x86/process.cc @@ -251,6 +251,20 @@ I386LiveProcess::startup() 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. + */ + _gdtStart = stack_base; + _gdtSize = VMPageSize; + 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); + } + for (int i = 0; i < contextIds.size(); i++) { ThreadContext * tc = system->getThreadContext(contextIds[i]); @@ -281,6 +295,10 @@ I386LiveProcess::startup() 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 up the registers that describe the operating mode. CR0 cr0 = 0; cr0.pg = 1; // Turn on paging. diff --git a/src/arch/x86/process.hh b/src/arch/x86/process.hh index e337e589e..2d72d3fd0 100644 --- a/src/arch/x86/process.hh +++ b/src/arch/x86/process.hh @@ -70,6 +70,9 @@ namespace X86ISA class X86LiveProcess : public LiveProcess { protected: + Addr _gdtStart; + Addr _gdtSize; + SyscallDesc *syscallDescs; const int numSyscallDescs; @@ -80,6 +83,12 @@ namespace X86ISA void argsInit(int pageSize); public: + Addr gdtStart() + { return _gdtStart; } + + Addr gdtSize() + { return _gdtSize; } + SyscallDesc* getDesc(int callnum); void setSyscallReturn(ThreadContext *tc, SyscallReturn return_value); |