l4/pkg/plr/server/src/app_loading.cc

   1 #include "app_loading"
   2 #include "locking.h"
   3
   4 /*
   5  * app_loading.cc --
   6  *
   7  *    Implementation of application loading. Similar to the stuff
   8  *    moe and ned do.
   9  *
  10  * (c) 2011-2013 Björn Döbel <doebel@os.inf.tu-dresden.de>,
  11  *     economic rights: Technische Universität Dresden (Germany)
  12  * This file is part of TUD:OS and distributed under the terms of the
  13  * GNU General Public License 2.
  14  * Please see the COPYING-GPL-2 file for details.
  15  */
  16
  17 #define MSG() DEBUGf(Romain::Log::Loader)
  18
  19 Romain::App_model::Const_dataspace Romain::App_model::open_file(char const *name)
  20 {
  21         MSG() << name;
  22
  23         int err = open(name, O_RDONLY);
  24         MSG() << "fopen: " << err;
  25
  26         cxx::Ref_ptr<L4Re::Vfs::File> fp = L4Re::Vfs::vfs_ops->get_file(err);
  27         MSG() << "file ptr @ " << fp;
  28
  29         Romain::App_model::Dataspace ds_cap = fp->data_space();
  30         MSG() << "ds @ 0x" << std::hex << ds_cap.cap();
  31
  32         return ds_cap;
  33 }
  34
  35 l4_addr_t Romain::App_model::local_attach_ds(Romain::App_model::Const_dataspace ds,
  36                                              unsigned long size,
  37                                              unsigned long offset) const
  38 {
  39         Romain::Rm_guard r(rm(), 0); // we always init stuff for instance 0,
  40         // rest is paged in lazily
  41         // XXX: duplicate, remove
  42 #if 0
  43         MSG() << std::hex << ds.cap() << " "
  44               << size << " "
  45               << offset << " "
  46               << l4_round_page(offset);
  47 #endif
  48         unsigned flags = L4Re::Rm::Search_addr;
  49
  50         /* This function is called during startup for attaching the
  51          * binary DS read-only to read ELF info. However, in this case
  52          * we don't have any flags indicating this and writing the DS will
  53          * fail. Therefore, this hacky check adds an RO flag so that the
  54          * memory manager performs the right thing.
  55          */
  56         if (ds == binary()) {
  57                 flags |= L4Re::Rm::Read_only;
  58         }
  59         Romain::Region_handler handler(ds, L4_INVALID_CAP, offset, 0,
  60                                     Romain::Region(0, 0));
  61         l4_addr_t ret = (l4_addr_t)rm()->attach_locally((void*)0xdeadbeef,
  62                                                         size, &handler, flags);
  63         return ret;
  64 }
  65
  66
  67 void Romain::App_model::local_detach_ds(l4_addr_t addr, unsigned long /*size*/) const
  68 {
  69 #if 0
  70         MSG() << (void*)addr;
  71 #endif
  72
  73         long r = L4Re::Env::env()->rm()->detach(addr, 0);
  74         _check(r != 0, "detach error");
  75 }
  76
  77
  78 int Romain::App_model::prog_reserve_area(l4_addr_t *start, unsigned long size,
  79                                       unsigned flags, unsigned char align)
  80 {
  81         MSG() << (void*)start << " "
  82               << size << " "
  83               << flags << " "
  84               << align;
  85         _check(1, "prog_reserve_area unimplemented");
  86         return -1;
  87 }
  88
  89
  90 Romain::App_model::Dataspace Romain::App_model::alloc_app_stack()
  91 {
  92 #if 0
  93         MSG() << __func__ << " " << _stack.stack_size() << " "
  94               << std::hex << (void*)_stack.ptr();
  95 #endif
  96         Romain::App_model::Dataspace ds = this->alloc_ds(_stack.stack_size());
  97         char *addr = reinterpret_cast<char*>(this->local_attach_ds(ds, _stack.stack_size(), 0));
  98         MSG() << "attached app stack: " << (void*)addr;
  99         _local_stack_address = l4_addr_t(addr);
 100
 101         //_stack.ptr(addr);
 102         _stack.set_local_top(addr + _stack.stack_size());
 103         MSG() << "stack local : " << std::hex << (void*)_stack.ptr();
 104         MSG() << "stack remote: " << std::hex << (void*)_stack.relocate(_stack.ptr());
 105
 106         /*
 107          * Place UTCB area pointer at the very top of the stack.
 108          * This way we know exactly what to put into the FS segment
 109          * descriptor.
 110          */
 111         _stack.push(prog_info()->utcbs_start);
 112
 113         return ds;
 114 }
 115
 116
 117 void Romain::App_model::prog_attach_kip()
 118 {
 119         MSG() << "ATTACHING KIP: " << (void*)this->prog_info()->kip;
 120         this->prog_attach_ds(this->prog_info()->kip, L4_PAGESIZE,
 121                              this->local_kip_ds(), 0,
 122                              L4Re::Rm::Read_only, "attaching KIP segment",
 123                              (l4_addr_t)l4re_kip());
 124         //enter_kdebug("kip");
 125 }
 126
 127
 128 void*
 129 Romain::App_model::prog_attach_ds(l4_addr_t addr, unsigned long size,
 130                                   Romain::App_model::Const_dataspace ds, unsigned long offset,
 131                                   unsigned flags, char const *what, l4_addr_t local_start,
 132                                   bool sharedFlag)
 133 {
 134         (void)what;
 135         Romain::Rm_guard r(rm(), 0); // we always init stuff for instance 0,
 136                                   // rest is paged in lazily
 137 #if 0
 138         MSG() << std::hex << (void*)addr << " "
 139               << size << " "
 140               << ds.cap() << " "
 141               << offset << " "
 142               << flags << " "
 143               << local_start << " "
 144               << what;
 145 #endif
 146
 147         /*
 148          * This is where we remember the initial segments.
 149          */
 150         void* target = rm()->attach((void*)addr, size,
 151                                     Romain::Region_handler(
 152                                         ds, L4_INVALID_CAP, offset, flags,
 153                                         Romain::Region(local_start, local_start + size - 1)),
 154                                         flags, L4_PAGESHIFT, sharedFlag);
 155 #if 1
 156         MSG() << std::hex << (void*)target;
 157 #endif
 158
 159         _check(((target == 0) || (target == (void*)~0UL)), "error attaching segment");
 160         return target;
 161 }
 162
 163
 164 L4Re::Env*
 165 Romain::App_model::add_env()
 166 {
 167         _stack.push(l4re_env_cap_entry_t());
 168         push_initial_caps();
 169         L4Re::Env::Cap_entry *remote_cap_ptr =
 170                 reinterpret_cast<L4Re::Env::Cap_entry*>(_stack.relocate(_stack.ptr()));
 171         MSG() << "remote cap entries @ " << (void*)remote_cap_ptr;
 172
 173         L4Re::Env *env = _stack.push(L4Re::Env());
 174         memcpy(env, L4Re::Env::env(), sizeof(L4Re::Env));
 175         MSG() << "my first cap " << std::hex << env->first_free_cap();
 176         env->initial_caps(remote_cap_ptr);
 177         env->main_thread(L4::Cap<L4::Thread>(Romain::FIRST_REPLICA_CAP << L4_CAP_SHIFT));
 178         env->first_free_cap(Romain::FIRST_REPLICA_CAP + 1); // First free + 1, because the first
 179                                                             // free slot is used for the main thread's
 180                                                             // GateAgent
 181         env->utcb_area(l4_fpage(this->prog_info()->utcbs_start, this->prog_info()->utcbs_log2size, 0));
 182         env->first_free_utcb(this->prog_info()->utcbs_start + L4_UTCB_OFFSET);
 183
 184         return env;
 185 }
 186
 187
 188 Romain::App_model::Dataspace Romain::App_model::alloc_ds(unsigned long size) const
 189 {
 190         Dataspace ds;
 191         Romain::Region_map::allocate_ds(&ds, size);
 192         return ds;
 193 }
 194
 195 void Romain::App_model::copy_ds(Romain::App_model::Dataspace dst, unsigned long dst_offs,
 196                                 Const_dataspace src, unsigned long src_offs,
 197                                 unsigned long size)
 198 {
 199 #if 0
 200         MSG() << std::hex << dst.cap() << " "
 201               << dst_offs << " "
 202               << src.cap() << " "
 203               << src_offs << " "
 204               << size;
 205 #endif
 206         dst->copy_in(dst_offs, src, src_offs, size);
 207 #if 0
 208         MSG() << "...done";
 209 #endif
 210 }
 211
 212
 213 void Romain::App_model::prog_attach_stack(Romain::App_model::Dataspace app_stack)
 214 {
 215 #if 0
 216         MSG() << __func__ << std::hex
 217               << " " << app_stack.cap()
 218               << " " << (void*)_stack.target_addr()
 219               << " " << (void*)_stack.target_top();
 220 #endif
 221         this->prog_attach_ds(this->_stack.target_addr(),
 222                              this->_stack.stack_size(),
 223                              app_stack,
 224                              0, 0, "stack segment", _local_stack_address);
 225         prog_info()->stack_addr = _stack.target_addr() + _stack.stack_size();
 226 #if 0
 227         MSG() << std::hex << (void*)_stack.ptr() << " <-> "
 228               << (void*)_stack.relocate(_stack.ptr());
 229 #endif
 230 }
 231
 232
 233 void Romain::App_model::prog_reserve_utcb_area()
 234 {
 235         _utcb_area = this->alloc_ds(1 << prog_info()->utcbs_log2size);
 236 #if 0
 237         MSG() << __func__ << " " << std::hex
 238               << (void*)this->prog_info()->utcbs_start;
 239 #endif
 240         this->prog_attach_ds(this->prog_info()->utcbs_start,
 241                              1 << this->prog_info()->utcbs_log2size,
 242                              _utcb_area, 0, 0, "utcb area",
 243                              0);
 244 }
 245
 246
 247 void const *Romain::App_model::generate_l4aux(char const *name)
 248 {
 249         this->_stack.push(l4_umword_t(this->prog_info()->ldr_flags));
 250         this->_stack.push(l4_umword_t(this->prog_info()->l4re_dbg));
 251         this->_stack.push(l4_umword_t(local_kip_ds().cap()));
 252         return this->_stack.push_local_ptr(name);
 253 }