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         if (err < 0) {
  26                 ERROR() << "Could not open binary file '" << name << "'";
  27                 enter_kdebug("file not found");
  28         }
  29
  30         cxx::Ref_ptr<L4Re::Vfs::File> fp = L4Re::Vfs::vfs_ops->get_file(err);
  31         MSG() << "file ptr @ " << fp;
  32
  33         Romain::App_model::Dataspace ds_cap = fp->data_space();
  34         MSG() << "ds @ 0x" << std::hex << ds_cap.cap();
  35
  36         return ds_cap;
  37 }
  38
  39 l4_addr_t Romain::App_model::local_attach_ds(Romain::App_model::Const_dataspace ds,
  40                                              unsigned long size,
  41                                              unsigned long offset) const
  42 {
  43         Romain::Rm_guard r(rm(), 0); // we always init stuff for instance 0,
  44         // rest is paged in lazily
  45         // XXX: duplicate, remove
  46 #if 0
  47         MSG() << std::hex << ds.cap() << " "
  48               << size << " "
  49               << offset << " "
  50               << l4_round_page(offset);
  51 #endif
  52         unsigned flags = L4Re::Rm::Search_addr;
  53
  54         /* This function is called during startup for attaching the
  55          * binary DS read-only to read ELF info. However, in this case
  56          * we don't have any flags indicating this and writing the DS will
  57          * fail. Therefore, this hacky check adds an RO flag so that the
  58          * memory manager performs the right thing.
  59          */
  60         if (ds == binary()) {
  61                 flags |= L4Re::Rm::Read_only;
  62         }
  63         Romain::Region_handler handler(ds, L4_INVALID_CAP, offset, 0,
  64                                     Romain::Region(0, 0));
  65         l4_addr_t ret = (l4_addr_t)rm()->attach_locally((void*)0, size, &handler, flags);
  66         return ret;
  67 }
  68
  69
  70 void Romain::App_model::local_detach_ds(l4_addr_t addr, unsigned long /*size*/) const
  71 {
  72 #if 0
  73         MSG() << (void*)addr;
  74 #endif
  75
  76         long r = L4Re::Env::env()->rm()->detach(addr, 0);
  77         _check(r != 0, "detach error");
  78 }
  79
  80
  81 int Romain::App_model::prog_reserve_area(l4_addr_t *start, unsigned long size,
  82                                       unsigned flags, unsigned char align)
  83 {
  84         MSG() << (void*)start << " "
  85               << size << " "
  86               << flags << " "
  87               << align;
  88         _check(1, "prog_reserve_area unimplemented");
  89         return -1;
  90 }
  91
  92
  93 Romain::App_model::Dataspace Romain::App_model::alloc_app_stack()
  94 {
  95 #if 0
  96         MSG() << __func__ << " " << _stack.stack_size() << " "
  97               << std::hex << (void*)_stack.ptr();
  98 #endif
  99         Romain::App_model::Dataspace ds = this->alloc_ds(_stack.stack_size());
 100         char *addr = reinterpret_cast<char*>(this->local_attach_ds(ds, _stack.stack_size(), 0));
 101         MSG() << "attached app stack: " << (void*)addr;
 102         _local_stack_address = l4_addr_t(addr);
 103
 104         //_stack.ptr(addr);
 105         _stack.set_local_top(addr + _stack.stack_size());
 106         MSG() << "stack local : " << std::hex << (void*)_stack.ptr();
 107         MSG() << "stack remote: " << std::hex << (void*)_stack.relocate(_stack.ptr());
 108
 109         /*
 110          * Place UTCB area pointer at the very top of the stack.
 111          * This way we know exactly what to put into the FS segment
 112          * descriptor.
 113          */
 114         _stack.push(prog_info()->utcbs_start);
 115
 116         return ds;
 117 }
 118
 119
 120 void Romain::App_model::prog_attach_kip()
 121 {
 122         MSG() << "ATTACHING KIP: " << (void*)this->prog_info()->kip;
 123         this->prog_attach_ds(this->prog_info()->kip, L4_PAGESIZE,
 124                              this->local_kip_ds(), 0,
 125                              L4Re::Rm::Read_only, "attaching KIP segment",
 126                              (l4_addr_t)l4re_kip());
 127         //enter_kdebug("kip");
 128 }
 129
 130
 131 void*
 132 Romain::App_model::prog_attach_ds(l4_addr_t addr, unsigned long size,
 133                                   Romain::App_model::Const_dataspace ds, unsigned long offset,
 134                                   unsigned flags, char const *what, l4_addr_t local_start,
 135                                   bool sharedFlag)
 136 {
 137         (void)what;
 138         Romain::Rm_guard r(rm(), 0); // we always init stuff for instance 0,
 139                                   // rest is paged in lazily
 140 #if 0
 141         MSG() << std::hex << (void*)addr << " "
 142               << size << " "
 143               << ds.cap() << " "
 144               << offset << " "
 145               << flags << " "
 146               << local_start << " "
 147               << what;
 148 #endif
 149
 150         /*
 151          * This is where we remember the initial segments.
 152          */
 153         void* target = rm()->attach((void*)addr, size,
 154                                     Romain::Region_handler(
 155                                         ds, L4_INVALID_CAP, offset, flags,
 156                                         Romain::Region(local_start, local_start + size - 1)),
 157                                         flags, L4_PAGESHIFT, sharedFlag);
 158 #if 1
 159         MSG() << std::hex << (void*)target;
 160 #endif
 161
 162         _check(((target == 0) || (target == (void*)~0UL)), "error attaching segment");
 163         return target;
 164 }
 165
 166
 167 L4Re::Env*
 168 Romain::App_model::add_env()
 169 {
 170         _stack.push(l4re_env_cap_entry_t());
 171         push_initial_caps();
 172         L4Re::Env::Cap_entry *remote_cap_ptr =
 173                 reinterpret_cast<L4Re::Env::Cap_entry*>(_stack.relocate(_stack.ptr()));
 174         MSG() << "remote cap entries @ " << (void*)remote_cap_ptr;
 175
 176         L4Re::Env *env = _stack.push(L4Re::Env());
 177         memcpy(env, L4Re::Env::env(), sizeof(L4Re::Env));
 178         MSG() << "my first cap " << std::hex << env->first_free_cap();
 179         env->initial_caps(remote_cap_ptr);
 180         env->main_thread(L4::Cap<L4::Thread>(Romain::FIRST_REPLICA_CAP << L4_CAP_SHIFT));
 181         env->first_free_cap(Romain::FIRST_REPLICA_CAP + 1); // First free + 1, because the first
 182                                                             // free slot is used for the main thread's
 183                                                             // GateAgent
 184         env->utcb_area(l4_fpage(this->prog_info()->utcbs_start, this->prog_info()->utcbs_log2size, 0));
 185         env->first_free_utcb(this->prog_info()->utcbs_start + L4_UTCB_OFFSET);
 186
 187         return env;
 188 }
 189
 190
 191 Romain::App_model::Dataspace Romain::App_model::alloc_ds(unsigned long size) const
 192 {
 193         Dataspace ds;
 194         Romain::Region_map::allocate_ds(&ds, size);
 195         return ds;
 196 }
 197
 198 void Romain::App_model::copy_ds(Romain::App_model::Dataspace dst, unsigned long dst_offs,
 199                                 Const_dataspace src, unsigned long src_offs,
 200                                 unsigned long size)
 201 {
 202 #if 0
 203         MSG() << std::hex << dst.cap() << " "
 204               << dst_offs << " "
 205               << src.cap() << " "
 206               << src_offs << " "
 207               << size;
 208 #endif
 209         dst->copy_in(dst_offs, src, src_offs, size);
 210 #if 0
 211         MSG() << "...done";
 212 #endif
 213 }
 214
 215
 216 void Romain::App_model::prog_attach_stack(Romain::App_model::Dataspace app_stack)
 217 {
 218 #if 0
 219         MSG() << __func__ << std::hex
 220               << " " << app_stack.cap()
 221               << " " << (void*)_stack.target_addr()
 222               << " " << (void*)_stack.target_top();
 223 #endif
 224         this->prog_attach_ds(this->_stack.target_addr(),
 225                              this->_stack.stack_size(),
 226                              app_stack,
 227                              0, 0, "stack segment", _local_stack_address);
 228         prog_info()->stack_addr = _stack.target_addr() + _stack.stack_size();
 229 #if 0
 230         MSG() << std::hex << (void*)_stack.ptr() << " <-> "
 231               << (void*)_stack.relocate(_stack.ptr());
 232 #endif
 233 }
 234
 235
 236 void Romain::App_model::prog_reserve_utcb_area()
 237 {
 238         _utcb_area = this->alloc_ds(1 << prog_info()->utcbs_log2size);
 239 #if 0
 240         MSG() << __func__ << " " << std::hex
 241               << (void*)this->prog_info()->utcbs_start;
 242 #endif
 243         this->prog_attach_ds(this->prog_info()->utcbs_start,
 244                              1 << this->prog_info()->utcbs_log2size,
 245                              _utcb_area, 0, 0, "utcb area",
 246                              0);
 247 }
 248
 249
 250 void const *Romain::App_model::generate_l4aux(char const *name)
 251 {
 252         this->_stack.push(l4_umword_t(this->prog_info()->ldr_flags));
 253         this->_stack.push(l4_umword_t(this->prog_info()->l4re_dbg));
 254         this->_stack.push(l4_umword_t(local_kip_ds().cap()));
 255         return this->_stack.push_local_ptr(name);
 256 }