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*)0xdeadbeef,
  66                                                         size, &handler, flags);
  67         return ret;
  68 }
  69
  70
  71 void Romain::App_model::local_detach_ds(l4_addr_t addr, unsigned long /*size*/) const
  72 {
  73 #if 0
  74         MSG() << (void*)addr;
  75 #endif
  76
  77         long r = L4Re::Env::env()->rm()->detach(addr, 0);
  78         _check(r != 0, "detach error");
  79 }
  80
  81
  82 int Romain::App_model::prog_reserve_area(l4_addr_t *start, unsigned long size,
  83                                       unsigned flags, unsigned char align)
  84 {
  85         MSG() << (void*)start << " "
  86               << size << " "
  87               << flags << " "
  88               << align;
  89         _check(1, "prog_reserve_area unimplemented");
  90         return -1;
  91 }
  92
  93
  94 Romain::App_model::Dataspace Romain::App_model::alloc_app_stack()
  95 {
  96 #if 0
  97         MSG() << __func__ << " " << _stack.stack_size() << " "
  98               << std::hex << (void*)_stack.ptr();
  99 #endif
 100         Romain::App_model::Dataspace ds = this->alloc_ds(_stack.stack_size());
 101         char *addr = reinterpret_cast<char*>(this->local_attach_ds(ds, _stack.stack_size(), 0));
 102         MSG() << "attached app stack: " << (void*)addr;
 103         _local_stack_address = l4_addr_t(addr);
 104
 105         //_stack.ptr(addr);
 106         _stack.set_local_top(addr + _stack.stack_size());
 107         MSG() << "stack local : " << std::hex << (void*)_stack.ptr();
 108         MSG() << "stack remote: " << std::hex << (void*)_stack.relocate(_stack.ptr());
 109
 110         /*
 111          * Place UTCB area pointer at the very top of the stack.
 112          * This way we know exactly what to put into the FS segment
 113          * descriptor.
 114          */
 115         _stack.push(prog_info()->utcbs_start);
 116
 117         return ds;
 118 }
 119
 120
 121 void Romain::App_model::prog_attach_kip()
 122 {
 123         MSG() << "ATTACHING KIP: " << (void*)this->prog_info()->kip;
 124         this->prog_attach_ds(this->prog_info()->kip, L4_PAGESIZE,
 125                              this->local_kip_ds(), 0,
 126                              L4Re::Rm::Read_only, "attaching KIP segment",
 127                              (l4_addr_t)l4re_kip());
 128         //enter_kdebug("kip");
 129 }
 130
 131
 132 void*
 133 Romain::App_model::prog_attach_ds(l4_addr_t addr, unsigned long size,
 134                                   Romain::App_model::Const_dataspace ds, unsigned long offset,
 135                                   unsigned flags, char const *what, l4_addr_t local_start,
 136                                   bool sharedFlag)
 137 {
 138         (void)what;
 139         Romain::Rm_guard r(rm(), 0); // we always init stuff for instance 0,
 140                                   // rest is paged in lazily
 141 #if 0
 142         MSG() << std::hex << (void*)addr << " "
 143               << size << " "
 144               << ds.cap() << " "
 145               << offset << " "
 146               << flags << " "
 147               << local_start << " "
 148               << what;
 149 #endif
 150
 151         /*
 152          * This is where we remember the initial segments.
 153          */
 154         void* target = rm()->attach((void*)addr, size,
 155                                     Romain::Region_handler(
 156                                         ds, L4_INVALID_CAP, offset, flags,
 157                                         Romain::Region(local_start, local_start + size - 1)),
 158                                         flags, L4_PAGESHIFT, sharedFlag);
 159 #if 1
 160         MSG() << std::hex << (void*)target;
 161 #endif
 162
 163         _check(((target == 0) || (target == (void*)~0UL)), "error attaching segment");
 164         return target;
 165 }
 166
 167
 168 L4Re::Env*
 169 Romain::App_model::add_env()
 170 {
 171         _stack.push(l4re_env_cap_entry_t());
 172         push_initial_caps();
 173         L4Re::Env::Cap_entry *remote_cap_ptr =
 174                 reinterpret_cast<L4Re::Env::Cap_entry*>(_stack.relocate(_stack.ptr()));
 175         MSG() << "remote cap entries @ " << (void*)remote_cap_ptr;
 176
 177         L4Re::Env *env = _stack.push(L4Re::Env());
 178         memcpy(env, L4Re::Env::env(), sizeof(L4Re::Env));
 179         MSG() << "my first cap " << std::hex << env->first_free_cap();
 180         env->initial_caps(remote_cap_ptr);
 181         env->main_thread(L4::Cap<L4::Thread>(Romain::FIRST_REPLICA_CAP << L4_CAP_SHIFT));
 182         env->first_free_cap(Romain::FIRST_REPLICA_CAP + 1); // First free + 1, because the first
 183                                                             // free slot is used for the main thread's
 184                                                             // GateAgent
 185         env->utcb_area(l4_fpage(this->prog_info()->utcbs_start, this->prog_info()->utcbs_log2size, 0));
 186         env->first_free_utcb(this->prog_info()->utcbs_start + L4_UTCB_OFFSET);
 187
 188         return env;
 189 }
 190
 191
 192 Romain::App_model::Dataspace Romain::App_model::alloc_ds(unsigned long size) const
 193 {
 194         Dataspace ds;
 195         Romain::Region_map::allocate_ds(&ds, size);
 196         return ds;
 197 }
 198
 199 void Romain::App_model::copy_ds(Romain::App_model::Dataspace dst, unsigned long dst_offs,
 200                                 Const_dataspace src, unsigned long src_offs,
 201                                 unsigned long size)
 202 {
 203 #if 0
 204         MSG() << std::hex << dst.cap() << " "
 205               << dst_offs << " "
 206               << src.cap() << " "
 207               << src_offs << " "
 208               << size;
 209 #endif
 210         dst->copy_in(dst_offs, src, src_offs, size);
 211 #if 0
 212         MSG() << "...done";
 213 #endif
 214 }
 215
 216
 217 void Romain::App_model::prog_attach_stack(Romain::App_model::Dataspace app_stack)
 218 {
 219 #if 0
 220         MSG() << __func__ << std::hex
 221               << " " << app_stack.cap()
 222               << " " << (void*)_stack.target_addr()
 223               << " " << (void*)_stack.target_top();
 224 #endif
 225         this->prog_attach_ds(this->_stack.target_addr(),
 226                              this->_stack.stack_size(),
 227                              app_stack,
 228                              0, 0, "stack segment", _local_stack_address);
 229         prog_info()->stack_addr = _stack.target_addr() + _stack.stack_size();
 230 #if 0
 231         MSG() << std::hex << (void*)_stack.ptr() << " <-> "
 232               << (void*)_stack.relocate(_stack.ptr());
 233 #endif
 234 }
 235
 236
 237 void Romain::App_model::prog_reserve_utcb_area()
 238 {
 239         _utcb_area = this->alloc_ds(1 << prog_info()->utcbs_log2size);
 240 #if 0
 241         MSG() << __func__ << " " << std::hex
 242               << (void*)this->prog_info()->utcbs_start;
 243 #endif
 244         this->prog_attach_ds(this->prog_info()->utcbs_start,
 245                              1 << this->prog_info()->utcbs_log2size,
 246                              _utcb_area, 0, 0, "utcb area",
 247                              0);
 248 }
 249
 250
 251 void const *Romain::App_model::generate_l4aux(char const *name)
 252 {
 253         this->_stack.push(l4_umword_t(this->prog_info()->ldr_flags));
 254         this->_stack.push(l4_umword_t(this->prog_info()->l4re_dbg));
 255         this->_stack.push(l4_umword_t(local_kip_ds().cap()));
 256         return this->_stack.push_local_ptr(name);
 257 }