diff options
Diffstat (limited to 'src/sim/syscall_emul.cc')
| -rw-r--r-- | src/sim/syscall_emul.cc | 141 |
1 files changed, 46 insertions, 95 deletions
diff --git a/src/sim/syscall_emul.cc b/src/sim/syscall_emul.cc index c6b89b0c7..07899ec9a 100644 --- a/src/sim/syscall_emul.cc +++ b/src/sim/syscall_emul.cc @@ -74,18 +74,41 @@ ignoreFunc(SyscallDesc *desc, int callnum, Process *process, return 0; } +static void +exitFutexWake(ThreadContext *tc, uint64_t uaddr) +{ + std::map<uint64_t, std::list<ThreadContext *> * > + &futex_map = tc->getSystemPtr()->futexMap; + + int wokenUp = 0; + std::list<ThreadContext *> * tcWaitList; + if (futex_map.count(uaddr)) { + tcWaitList = futex_map.find(uaddr)->second; + if (tcWaitList->size() > 0) { + tcWaitList->front()->activate(); + tcWaitList->pop_front(); + wokenUp++; + } + if (tcWaitList->empty()) { + futex_map.erase(uaddr); + delete tcWaitList; + } + } + DPRINTF(SyscallVerbose, "exit: FUTEX_WAKE, activated %d waiting " + "thread contexts\n", wokenUp); +} SyscallReturn -exitFunc(SyscallDesc *desc, int callnum, Process *process, - ThreadContext *tc) +exitFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) { - if (process->system->numRunningContexts() == 1) { - // Last running context... exit simulator + if (p->system->numRunningContexts() == 1 && !p->childClearTID) { + // Last running free-parent context; exit simulator. int index = 0; exitSimLoop("target called exit()", - process->getSyscallArg(tc, index) & 0xff); + p->getSyscallArg(tc, index) & 0xff); } else { - // other running threads... just halt this one + if (p->childClearTID) + exitFutexWake(tc, p->childClearTID); tc->halt(); } @@ -130,11 +153,12 @@ brkFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) // in Linux at least, brk(0) returns the current break value // (note that the syscall and the glibc function have different behavior) if (new_brk == 0) - return p->brk_point; + return p->memState->brkPoint; - if (new_brk > p->brk_point) { + if (new_brk > p->memState->brkPoint) { // might need to allocate some new pages - for (ChunkGenerator gen(p->brk_point, new_brk - p->brk_point, + for (ChunkGenerator gen(p->memState->brkPoint, + new_brk - p->memState->brkPoint, PageBytes); !gen.done(); gen.next()) { if (!p->pTable->translate(gen.addr())) p->allocateMem(roundDown(gen.addr(), PageBytes), PageBytes); @@ -159,12 +183,22 @@ brkFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) } } - p->brk_point = new_brk; + p->memState->brkPoint = new_brk; DPRINTF_SYSCALL(Verbose, "brk: break point changed to: %#X\n", - p->brk_point); - return p->brk_point; + p->memState->brkPoint); + return p->memState->brkPoint; } +SyscallReturn +setTidAddressFunc(SyscallDesc *desc, int callnum, Process *process, + ThreadContext *tc) +{ + int index = 0; + uint64_t tidPtr = process->getSyscallArg(tc, index); + + process->childClearTID = tidPtr; + return process->pid(); +} SyscallReturn closeFunc(SyscallDesc *desc, int num, Process *p, ThreadContext *tc) @@ -860,89 +894,6 @@ getegidFunc(SyscallDesc *desc, int callnum, Process *process, return process->egid(); } - -SyscallReturn -cloneFunc(SyscallDesc *desc, int callnum, Process *process, - ThreadContext *tc) -{ - int index = 0; - IntReg flags = process->getSyscallArg(tc, index); - IntReg newStack = process->getSyscallArg(tc, index); - - DPRINTF(SyscallVerbose, "In sys_clone:\n"); - DPRINTF(SyscallVerbose, " Flags=%llx\n", flags); - DPRINTF(SyscallVerbose, " Child stack=%llx\n", newStack); - - - if (flags != 0x10f00) { - warn("This sys_clone implementation assumes flags " - "CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD " - "(0x10f00), and may not work correctly with given flags " - "0x%llx\n", flags); - } - - ThreadContext* ctc; // child thread context - if ((ctc = process->findFreeContext())) { - DPRINTF(SyscallVerbose, " Found unallocated thread context\n"); - - ctc->clearArchRegs(); - - // Arch-specific cloning code - #if THE_ISA == ALPHA_ISA or THE_ISA == X86_ISA - // Cloning the misc. regs for these archs is enough - TheISA::copyMiscRegs(tc, ctc); - #elif THE_ISA == SPARC_ISA - TheISA::copyRegs(tc, ctc); - - // TODO: Explain what this code actually does :-) - ctc->setIntReg(NumIntArchRegs + 6, 0); - ctc->setIntReg(NumIntArchRegs + 4, 0); - ctc->setIntReg(NumIntArchRegs + 3, NWindows - 2); - ctc->setIntReg(NumIntArchRegs + 5, NWindows); - ctc->setMiscReg(MISCREG_CWP, 0); - ctc->setIntReg(NumIntArchRegs + 7, 0); - ctc->setMiscRegNoEffect(MISCREG_TL, 0); - ctc->setMiscReg(MISCREG_ASI, ASI_PRIMARY); - - for (int y = 8; y < 32; y++) - ctc->setIntReg(y, tc->readIntReg(y)); - #elif THE_ISA == ARM_ISA - TheISA::copyRegs(tc, ctc); - #else - fatal("sys_clone is not implemented for this ISA\n"); - #endif - - // Set up stack register - ctc->setIntReg(TheISA::StackPointerReg, newStack); - - // Set up syscall return values in parent and child - ctc->setIntReg(ReturnValueReg, 0); // return value, child - - // Alpha needs SyscallSuccessReg=0 in child - #if THE_ISA == ALPHA_ISA - ctc->setIntReg(TheISA::SyscallSuccessReg, 0); - #endif - - // In SPARC/Linux, clone returns 0 on pseudo-return register if - // parent, non-zero if child - #if THE_ISA == SPARC_ISA - tc->setIntReg(TheISA::SyscallPseudoReturnReg, 0); - ctc->setIntReg(TheISA::SyscallPseudoReturnReg, 1); - #endif - - ctc->pcState(tc->nextInstAddr()); - - ctc->activate(); - - // Should return nonzero child TID in parent's syscall return register, - // but for our pthread library any non-zero value will work - return 1; - } else { - fatal("Called sys_clone, but no unallocated thread contexts found!\n"); - return 0; - } -} - SyscallReturn fallocateFunc(SyscallDesc *desc, int callnum, Process *p, ThreadContext *tc) { |