From: Lisa Hsu Date: Mon, 16 Feb 2009 22:47:39 +0000 (-0500) Subject: sycalls: implement mremap() and add DATA flag for getrlimit(). mremap has been tested... X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=5d029ff11e88ba0ab89c88e500c5d0d2edaf744e;p=gem5.git sycalls: implement mremap() and add DATA flag for getrlimit(). mremap has been tested on Alpha, compiles for the rest but not tested. I don't see why it wouldn't work though. --- diff --git a/src/arch/alpha/linux/process.cc b/src/arch/alpha/linux/process.cc index 6684051af..605e40627 100644 --- a/src/arch/alpha/linux/process.cc +++ b/src/arch/alpha/linux/process.cc @@ -463,7 +463,7 @@ SyscallDesc AlphaLinuxProcess::syscallDescs[] = { /* 338 */ SyscallDesc("afs_syscall", unimplementedFunc), /* 339 */ SyscallDesc("uname", unameFunc), /* 340 */ SyscallDesc("nanosleep", unimplementedFunc), - /* 341 */ SyscallDesc("mremap", unimplementedFunc), + /* 341 */ SyscallDesc("mremap", mremapFunc), /* 342 */ SyscallDesc("nfsservctl", unimplementedFunc), /* 343 */ SyscallDesc("setresuid", unimplementedFunc), /* 344 */ SyscallDesc("getresuid", unimplementedFunc), diff --git a/src/arch/alpha/pagetable.hh b/src/arch/alpha/pagetable.hh index 6cf11be56..59df93bef 100644 --- a/src/arch/alpha/pagetable.hh +++ b/src/arch/alpha/pagetable.hh @@ -123,6 +123,13 @@ struct TlbEntry TlbEntry() {} + void + updateVaddr(Addr new_vaddr) + { + VAddr vaddr(new_vaddr); + tag = vaddr.vpn(); + } + Addr pageStart() { diff --git a/src/arch/mips/linux/process.cc b/src/arch/mips/linux/process.cc index ce09e1628..9d9d33325 100644 --- a/src/arch/mips/linux/process.cc +++ b/src/arch/mips/linux/process.cc @@ -288,7 +288,7 @@ SyscallDesc MipsLinuxProcess::syscallDescs[] = { /* 164 */ SyscallDesc("sched_get_priority_min", unimplementedFunc), /* 165 */ SyscallDesc("sched_rr_get_interval", unimplementedFunc), /* 166 */ SyscallDesc("nanosleep", unimplementedFunc), - /* 167 */ SyscallDesc("mremap", unimplementedFunc), + /* 167 */ SyscallDesc("mremap", mremapFunc), /* 168 */ SyscallDesc("accept", unimplementedFunc), /* 169 */ SyscallDesc("bind", unimplementedFunc), /* 170 */ SyscallDesc("connect", unimplementedFunc), diff --git a/src/arch/mips/tlb.hh b/src/arch/mips/tlb.hh index feb2509c5..4a8fc32ac 100644 --- a/src/arch/mips/tlb.hh +++ b/src/arch/mips/tlb.hh @@ -68,6 +68,9 @@ struct TlbEntry return _pageStart; } + void + updateVaddr(Addr new_vaddr) {} + void serialize(std::ostream &os) { SERIALIZE_SCALAR(_pageStart); diff --git a/src/arch/sparc/linux/syscalls.cc b/src/arch/sparc/linux/syscalls.cc index 2845f7bec..3e8c603cd 100644 --- a/src/arch/sparc/linux/syscalls.cc +++ b/src/arch/sparc/linux/syscalls.cc @@ -339,7 +339,7 @@ SyscallDesc SparcLinuxProcess::syscall32Descs[] = { /* 247 */ SyscallDesc("sched_get_priority_min", unimplementedFunc), //32 bit /* 248 */ SyscallDesc("sched_rr_get_interval", unimplementedFunc), //32 bit /* 249 */ SyscallDesc("nanosleep", unimplementedFunc), - /* 250 */ SyscallDesc("mremap", unimplementedFunc), //32 bit + /* 250 */ SyscallDesc("mremap", mremapFunc), //32 bit /* 251 */ SyscallDesc("_sysctl", unimplementedFunc), //32 bit /* 252 */ SyscallDesc("getsid", unimplementedFunc), //32 bit /* 253 */ SyscallDesc("fdatasync", unimplementedFunc), @@ -642,7 +642,7 @@ SyscallDesc SparcLinuxProcess::syscallDescs[] = { /* 247 */ SyscallDesc("sched_get_priority_min", unimplementedFunc), /* 248 */ SyscallDesc("sched_rr_get_interval", unimplementedFunc), /* 249 */ SyscallDesc("nanosleep", unimplementedFunc), - /* 250 */ SyscallDesc("mremap", unimplementedFunc), + /* 250 */ SyscallDesc("mremap", mremapFunc), /* 251 */ SyscallDesc("_sysctl", unimplementedFunc), /* 252 */ SyscallDesc("getsid", unimplementedFunc), /* 253 */ SyscallDesc("fdatasync", unimplementedFunc), diff --git a/src/arch/sparc/pagetable.hh b/src/arch/sparc/pagetable.hh index ee4ca0c2c..cbdabe4c3 100644 --- a/src/arch/sparc/pagetable.hh +++ b/src/arch/sparc/pagetable.hh @@ -266,6 +266,12 @@ struct TlbEntry return pte.paddr(); } + void + updateVaddr(Addr new_vaddr) + { + range.va = new_vaddr; + } + void serialize(std::ostream &os); void unserialize(Checkpoint *cp, const std::string §ion); }; diff --git a/src/arch/x86/linux/syscalls.cc b/src/arch/x86/linux/syscalls.cc index 754fb2eaf..ca35a5dd6 100644 --- a/src/arch/x86/linux/syscalls.cc +++ b/src/arch/x86/linux/syscalls.cc @@ -148,7 +148,7 @@ SyscallDesc X86LinuxProcess::syscallDescs[] = { /* 22 */ SyscallDesc("pipe", unimplementedFunc), /* 23 */ SyscallDesc("select", unimplementedFunc), /* 24 */ SyscallDesc("sched_yield", unimplementedFunc), - /* 25 */ SyscallDesc("mremap", unimplementedFunc), + /* 25 */ SyscallDesc("mremap", mremapFunc), /* 26 */ SyscallDesc("msync", unimplementedFunc), /* 27 */ SyscallDesc("mincore", unimplementedFunc), /* 28 */ SyscallDesc("madvise", unimplementedFunc), diff --git a/src/arch/x86/pagetable.hh b/src/arch/x86/pagetable.hh index e42693c03..1a7a945e4 100644 --- a/src/arch/x86/pagetable.hh +++ b/src/arch/x86/pagetable.hh @@ -113,6 +113,12 @@ namespace X86ISA TlbEntry(Addr asn, Addr _vaddr, Addr _paddr); TlbEntry() {} + void + updateVaddr(Addr new_vaddr) + { + vaddr = new_vaddr; + } + Addr pageStart() { return paddr; diff --git a/src/mem/page_table.cc b/src/mem/page_table.cc index 54165f293..bdcbbfec3 100644 --- a/src/mem/page_table.cc +++ b/src/mem/page_table.cc @@ -87,6 +87,44 @@ PageTable::allocate(Addr vaddr, int64_t size) } } +void +PageTable::remap(Addr vaddr, int64_t size, Addr new_vaddr) +{ + assert(pageOffset(vaddr) == 0); + assert(pageOffset(new_vaddr) == 0); + + DPRINTF(MMU, "moving pages from vaddr %08p to %08p, size = %d\n", vaddr, + new_vaddr, size); + + for (; size > 0; size -= pageSize, vaddr += pageSize, new_vaddr += pageSize) { + PTableItr iter = pTable.find(vaddr); + + assert(iter != pTable.end()); + + pTable[new_vaddr] = pTable[vaddr]; + pTable.erase(vaddr); + pTable[new_vaddr].updateVaddr(new_vaddr); + updateCache(new_vaddr, pTable[new_vaddr]); + } +} + +void +PageTable::deallocate(Addr vaddr, int64_t size) +{ + assert(pageOffset(vaddr) == 0); + + DPRINTF(MMU, "Deallocating page: %#x-%#x\n", vaddr, vaddr+ size); + + for (; size > 0; size -= pageSize, vaddr += pageSize) { + PTableItr iter = pTable.find(vaddr); + + assert(iter != pTable.end()); + + pTable.erase(vaddr); + } + +} + bool PageTable::lookup(Addr vaddr, TheISA::TlbEntry &entry) { diff --git a/src/mem/page_table.hh b/src/mem/page_table.hh index 6ff0be082..d4101c6bf 100644 --- a/src/mem/page_table.hh +++ b/src/mem/page_table.hh @@ -80,6 +80,8 @@ class PageTable Addr pageOffset(Addr a) { return (a & offsetMask); } void allocate(Addr vaddr, int64_t size); + void remap(Addr vaddr, int64_t size, Addr new_vaddr); + void deallocate(Addr vaddr, int64_t size); /** * Lookup function diff --git a/src/sim/syscall_emul.hh b/src/sim/syscall_emul.hh index c334c1e26..0e34a835e 100644 --- a/src/sim/syscall_emul.hh +++ b/src/sim/syscall_emul.hh @@ -607,6 +607,51 @@ fchmodFunc(SyscallDesc *desc, int callnum, LiveProcess *process, return 0; } +/// Target mremap() handler. +template +SyscallReturn +mremapFunc(SyscallDesc *desc, int callnum, LiveProcess *process, ThreadContext *tc) +{ + Addr start = tc->getSyscallArg(0); + uint64_t old_length = tc->getSyscallArg(1); + uint64_t new_length = tc->getSyscallArg(2); + uint64_t flags = tc->getSyscallArg(3); + + if ((start % TheISA::VMPageSize != 0) || + (new_length % TheISA::VMPageSize != 0)) { + warn("mremap failing: arguments not page aligned"); + return -EINVAL; + } + + if (new_length > old_length) { + if ((start + old_length) == process->mmap_end) { + uint64_t diff = new_length - old_length; + process->pTable->allocate(process->mmap_end, diff); + process->mmap_end += diff; + return start; + } else { + // sys/mman.h defined MREMAP_MAYMOVE + if (!(flags & 1)) { + warn("can't remap here and MREMAP_MAYMOVE flag not set\n"); + return -ENOMEM; + } else { + process->pTable->remap(start, old_length, process->mmap_end); + warn("mremapping to totally new vaddr %08p-%08p, adding %d\n", + process->mmap_end, process->mmap_end + new_length, new_length); + start = process->mmap_end; + // add on the remaining unallocated pages + process->pTable->allocate(start + old_length, new_length - old_length); + process->mmap_end += new_length; + warn("returning %08p as start\n", start); + return start; + } + } + } else { + process->pTable->deallocate(start + new_length, old_length - + new_length); + return start; + } +} /// Target stat() handler. template @@ -892,6 +937,7 @@ mmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc) // int fd = p->sim_fd(tc->getSyscallArg(4)); // int offset = tc->getSyscallArg(5); + if ((start % TheISA::VMPageSize) != 0 || (length % TheISA::VMPageSize) != 0) { warn("mmap failing: arguments not page-aligned: " @@ -929,12 +975,19 @@ getrlimitFunc(SyscallDesc *desc, int callnum, LiveProcess *process, switch (resource) { case OS::TGT_RLIMIT_STACK: - // max stack size in bytes: make up a number (2MB for now) + // max stack size in bytes: make up a number (8MB for now) rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024; rlp->rlim_cur = htog(rlp->rlim_cur); rlp->rlim_max = htog(rlp->rlim_max); break; + case OS::TGT_RLIMIT_DATA: + // max data segment size in bytes: make up a number + rlp->rlim_cur = rlp->rlim_max = 256 * 1024 * 1024; + rlp->rlim_cur = htog(rlp->rlim_cur); + rlp->rlim_max = htog(rlp->rlim_max); + break; + default: std::cerr << "getrlimitFunc: unimplemented resource " << resource << std::endl;