src/arch/arm/stacktrace.cc

   1 /*
   2  * Copyright (c) 2005 The Regents of The University of Michigan
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met: redistributions of source code must retain the above copyright
   8  * notice, this list of conditions and the following disclaimer;
   9  * redistributions in binary form must reproduce the above copyright
  10  * notice, this list of conditions and the following disclaimer in the
  11  * documentation and/or other materials provided with the distribution;
  12  * neither the name of the copyright holders nor the names of its
  13  * contributors may be used to endorse or promote products derived from
  14  * this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  20  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #include "arch/arm/stacktrace.hh"
  30
  31 #include <string>
  32
  33 #include "arch/arm/isa_traits.hh"
  34 #include "arch/arm/vtophys.hh"
  35 #include "base/bitfield.hh"
  36 #include "base/trace.hh"
  37 #include "cpu/base.hh"
  38 #include "cpu/thread_context.hh"
  39 #include "mem/fs_translating_port_proxy.hh"
  40 #include "sim/system.hh"
  41
  42 namespace ArmISA
  43 {
  44
  45 static int32_t
  46 readSymbol(ThreadContext *tc, const std::string name)
  47 {
  48     PortProxy &vp = tc->getVirtProxy();
  49     SymbolTable *symtab = tc->getSystemPtr()->kernelSymtab;
  50
  51     Addr addr;
  52     if (!symtab->findAddress(name, addr))
  53         panic("thread info not compiled into kernel\n");
  54
  55     return vp.read<int32_t>(addr, GuestByteOrder);
  56 }
  57
  58 ProcessInfo::ProcessInfo(ThreadContext *_tc) : tc(_tc)
  59 {
  60     thread_info_size = readSymbol(tc, "thread_info_size");
  61     task_struct_size = readSymbol(tc, "task_struct_size");
  62     task_off = readSymbol(tc, "thread_info_task");
  63     pid_off = readSymbol(tc, "task_struct_pid");
  64     name_off = readSymbol(tc, "task_struct_comm");
  65 }
  66
  67 Addr
  68 ProcessInfo::task(Addr ksp) const
  69 {
  70     Addr base = ksp & ~0x1fff;
  71     if (base == ULL(0xffffffffc0000000))
  72         return 0;
  73
  74     Addr tsk;
  75
  76     PortProxy &vp = tc->getVirtProxy();
  77     tsk = vp.read<Addr>(base + task_off, GuestByteOrder);
  78
  79     return tsk;
  80 }
  81
  82 int
  83 ProcessInfo::pid(Addr ksp) const
  84 {
  85     Addr task = this->task(ksp);
  86     if (!task)
  87         return -1;
  88
  89     uint16_t pd;
  90
  91     PortProxy &vp = tc->getVirtProxy();
  92     pd = vp.read<uint16_t>(task + pid_off, GuestByteOrder);
  93
  94     return pd;
  95 }
  96
  97 std::string
  98 ProcessInfo::name(Addr ksp) const
  99 {
 100     Addr task = this->task(ksp);
 101     if (!task)
 102         return "unknown";
 103
 104     char comm[256];
 105     tc->getVirtProxy().readString(comm, task + name_off, sizeof(comm));
 106     if (!comm[0])
 107         return "startup";
 108
 109     return comm;
 110 }
 111
 112 StackTrace::StackTrace()
 113     : tc(0), stack(64)
 114 {
 115 }
 116
 117 StackTrace::StackTrace(ThreadContext *_tc, const StaticInstPtr &inst)
 118     : tc(0), stack(64)
 119 {
 120     trace(_tc, inst);
 121 }
 122
 123 StackTrace::~StackTrace()
 124 {
 125 }
 126
 127 void
 128 StackTrace::trace(ThreadContext *_tc, bool is_call)
 129 {
 130 }
 131
 132 bool
 133 StackTrace::isEntry(Addr addr)
 134 {
 135     return false;
 136 }
 137
 138 bool
 139 StackTrace::decodeStack(MachInst inst, int &disp)
 140 {
 141     return false;
 142 }
 143
 144 bool
 145 StackTrace::decodeSave(MachInst inst, int &reg, int &disp)
 146 {
 147     return false;
 148 }
 149
 150 /*
 151  * Decode the function prologue for the function we're in, and note
 152  * which registers are stored where, and how large the stack frame is.
 153  */
 154 bool
 155 StackTrace::decodePrologue(Addr sp, Addr callpc, Addr func,
 156                            int &size, Addr &ra)
 157 {
 158     return false;
 159 }
 160
 161 #if TRACING_ON
 162 void
 163 StackTrace::dump()
 164 {
 165     DPRINTFN("------ Stack ------\n");
 166
 167     DPRINTFN(" Not implemented\n");
 168 }
 169 #endif
 170 }