Add contib/libs/breakpad to export

commit_hash:9d85255f8d9249f14105e4626bf4484805b8aed4

1 files changed, 443 insertions, 0 deletions

diff --git a/contrib/libs/breakpad/src/processor/stackwalker_mips.cc b/contrib/libs/breakpad/src/processor/stackwalker_mips.cc
new file mode 100644
index 0000000000..c4ee21f350
--- /dev/null
+++ b/contrib/libs/breakpad/src/processor/stackwalker_mips.cc
@@ -0,0 +1,443 @@
+// Copyright (c) 2013 Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// stackwalker_mips.cc: MIPS-specific stackwalker.
+//
+// See stackwalker_mips.h for documentation.
+//
+// Author: Tata Elxsi
+
+#include "common/scoped_ptr.h"
+#include "google_breakpad/processor/call_stack.h"
+#include "google_breakpad/processor/code_modules.h"
+#include "google_breakpad/processor/memory_region.h"
+#include "google_breakpad/processor/source_line_resolver_interface.h"
+#include "google_breakpad/processor/stack_frame_cpu.h"
+#include "processor/cfi_frame_info.h"
+#include "processor/logging.h"
+#include "processor/postfix_evaluator-inl.h"
+#include "processor/stackwalker_mips.h"
+#include "processor/windows_frame_info.h"
+#include "google_breakpad/common/minidump_cpu_mips.h"
+
+namespace google_breakpad {
+
+StackwalkerMIPS::StackwalkerMIPS(const SystemInfo* system_info,
+                                 const MDRawContextMIPS* context,
+                                 MemoryRegion* memory,
+                                 const CodeModules* modules,
+                                 StackFrameSymbolizer* resolver_helper)
+: Stackwalker(system_info, memory, modules, resolver_helper),
+  context_(context) {
+  if (memory_) {
+    if (context_->context_flags & MD_CONTEXT_MIPS64 ) {
+      if (0xffffffffffffffff - memory_->GetBase() < memory_->GetSize() - 1) {
+        BPLOG(ERROR) << "Memory out of range for stackwalking mips64: "
+            << HexString(memory_->GetBase())
+            << "+"
+            << HexString(memory_->GetSize());
+        memory_ = NULL;
+      }
+    } else {
+      if (0xffffffff - memory_->GetBase() < memory_->GetSize() - 1) {
+        BPLOG(ERROR) << "Memory out of range for stackwalking mips32: "
+            << HexString(memory_->GetBase())
+            << "+"
+            << HexString(memory_->GetSize());
+        memory_ = NULL;
+      }
+    }
+  }
+}
+
+StackFrame* StackwalkerMIPS::GetContextFrame() {
+  if (!context_) {
+    BPLOG(ERROR) << "Can't get context frame without context.";
+    return NULL;
+  }
+
+  StackFrameMIPS* frame = new StackFrameMIPS();
+
+  // The instruction pointer is stored directly in a register, so pull it
+  // straight out of the CPU context structure.
+  frame->context = *context_;
+  frame->context_validity = StackFrameMIPS::CONTEXT_VALID_ALL;
+  frame->trust = StackFrame::FRAME_TRUST_CONTEXT;
+  frame->instruction = frame->context.epc;
+
+  return frame;
+}
+
+// Register names for mips.
+static const char* const kRegisterNames[] = {
+   "$zero", "$at", "$v0", "$v1", "$a0", "$a1", "$a2", "$a3", "$to", "$t1",
+   "$t2",   "$t3", "$t4", "$t5", "$t6", "$t7", "$s0", "$s1", "$s2", "$s3",
+   "$s4",   "$s5", "$s6", "$s7", "$t8", "$t9", "$k0", "$k1", "$gp", "$sp",
+   "$fp",   "$ra", NULL
+  // TODO(gordanac): add float point save registers
+};
+
+StackFrameMIPS* StackwalkerMIPS::GetCallerByCFIFrameInfo(
+    const vector<StackFrame*>& frames,
+    CFIFrameInfo* cfi_frame_info) {
+  StackFrameMIPS* last_frame = static_cast<StackFrameMIPS*>(frames.back());
+
+  if (context_->context_flags & MD_CONTEXT_MIPS) {
+    uint32_t pc = 0;
+
+    // Populate a dictionary with the valid register values in last_frame.
+    CFIFrameInfo::RegisterValueMap<uint32_t> callee_registers;
+    // Use the STACK CFI data to recover the caller's register values.
+    CFIFrameInfo::RegisterValueMap<uint32_t> caller_registers;
+
+    for (int i = 0; kRegisterNames[i]; ++i) {
+      caller_registers[kRegisterNames[i]] = last_frame->context.iregs[i];
+      callee_registers[kRegisterNames[i]] = last_frame->context.iregs[i];
+    }
+
+    if (!cfi_frame_info->FindCallerRegs(callee_registers, *memory_,
+        &caller_registers))  {
+      return NULL;
+    }
+
+    CFIFrameInfo::RegisterValueMap<uint32_t>::const_iterator entry =
+        caller_registers.find(".cfa");
+
+    if (entry != caller_registers.end()) {
+      caller_registers["$sp"] = entry->second;
+    }
+
+    entry = caller_registers.find(".ra");
+    if (entry != caller_registers.end()) {
+      caller_registers["$ra"] = entry->second;
+      pc = entry->second - 2 * sizeof(pc);
+    }
+    caller_registers["$pc"] = pc;
+    // Construct a new stack frame given the values the CFI recovered.
+    scoped_ptr<StackFrameMIPS> frame(new StackFrameMIPS());
+
+    for (int i = 0; kRegisterNames[i]; ++i) {
+      CFIFrameInfo::RegisterValueMap<uint32_t>::const_iterator caller_entry =
+          caller_registers.find(kRegisterNames[i]);
+
+      if (caller_entry != caller_registers.end()) {
+        // The value of this register is recovered; fill the context with the
+        // value from caller_registers.
+        frame->context.iregs[i] = caller_entry->second;
+        frame->context_validity |= StackFrameMIPS::RegisterValidFlag(i);
+      } else if (((i >= INDEX_MIPS_REG_S0 && i <= INDEX_MIPS_REG_S7) ||
+          (i > INDEX_MIPS_REG_GP && i < INDEX_MIPS_REG_RA)) &&
+          (last_frame->context_validity &
+              StackFrameMIPS::RegisterValidFlag(i))) {
+        // If the STACK CFI data doesn't mention some callee-save register, and
+        // it is valid in the callee, assume the callee has not yet changed it.
+        // Calee-save registers according to the MIPS o32 ABI specification are:
+        // $s0 to $s7
+        // $sp, $s8
+        frame->context.iregs[i] = last_frame->context.iregs[i];
+        frame->context_validity |= StackFrameMIPS::RegisterValidFlag(i);
+      }
+    }
+
+    frame->context.epc = caller_registers["$pc"];
+    frame->instruction = caller_registers["$pc"];
+    frame->context_validity |= StackFrameMIPS::CONTEXT_VALID_PC;
+
+    frame->context.iregs[MD_CONTEXT_MIPS_REG_RA] = caller_registers["$ra"];
+    frame->context_validity |= StackFrameMIPS::CONTEXT_VALID_RA;
+
+    frame->trust = StackFrame::FRAME_TRUST_CFI;
+
+    return frame.release();
+  } else {
+    uint64_t pc = 0;
+
+    // Populate a dictionary with the valid register values in last_frame.
+    CFIFrameInfo::RegisterValueMap<uint64_t> callee_registers;
+    // Use the STACK CFI data to recover the caller's register values.
+    CFIFrameInfo::RegisterValueMap<uint64_t> caller_registers;
+
+    for (int i = 0; kRegisterNames[i]; ++i) {
+      caller_registers[kRegisterNames[i]] = last_frame->context.iregs[i];
+      callee_registers[kRegisterNames[i]] = last_frame->context.iregs[i];
+    }
+
+    if (!cfi_frame_info->FindCallerRegs(callee_registers, *memory_,
+        &caller_registers))  {
+      return NULL;
+    }
+
+    CFIFrameInfo::RegisterValueMap<uint64_t>::const_iterator entry =
+        caller_registers.find(".cfa");
+
+    if (entry != caller_registers.end()) {
+      caller_registers["$sp"] = entry->second;
+    }
+
+    entry = caller_registers.find(".ra");
+    if (entry != caller_registers.end()) {
+      caller_registers["$ra"] = entry->second;
+      pc = entry->second - 2 * sizeof(pc);
+    }
+    caller_registers["$pc"] = pc;
+    // Construct a new stack frame given the values the CFI recovered.
+    scoped_ptr<StackFrameMIPS> frame(new StackFrameMIPS());
+
+    for (int i = 0; kRegisterNames[i]; ++i) {
+      CFIFrameInfo::RegisterValueMap<uint64_t>::const_iterator caller_entry =
+          caller_registers.find(kRegisterNames[i]);
+
+      if (caller_entry != caller_registers.end()) {
+        // The value of this register is recovered; fill the context with the
+        // value from caller_registers.
+        frame->context.iregs[i] = caller_entry->second;
+        frame->context_validity |= StackFrameMIPS::RegisterValidFlag(i);
+      } else if (((i >= INDEX_MIPS_REG_S0 && i <= INDEX_MIPS_REG_S7) ||
+          (i >= INDEX_MIPS_REG_GP && i < INDEX_MIPS_REG_RA)) &&
+          (last_frame->context_validity &
+              StackFrameMIPS::RegisterValidFlag(i))) {
+        // If the STACK CFI data doesn't mention some callee-save register, and
+        // it is valid in the callee, assume the callee has not yet changed it.
+        // Calee-save registers according to the MIPS o32 ABI specification are:
+        // $s0 to $s7
+        // $sp, $s8
+        frame->context.iregs[i] = last_frame->context.iregs[i];
+        frame->context_validity |= StackFrameMIPS::RegisterValidFlag(i);
+      }
+    }
+
+    frame->context.epc = caller_registers["$pc"];
+    frame->instruction = caller_registers["$pc"];
+    frame->context_validity |= StackFrameMIPS::CONTEXT_VALID_PC;
+
+    frame->context.iregs[MD_CONTEXT_MIPS_REG_RA] = caller_registers["$ra"];
+    frame->context_validity |= StackFrameMIPS::CONTEXT_VALID_RA;
+
+    frame->trust = StackFrame::FRAME_TRUST_CFI;
+
+    return frame.release();
+  }
+}
+
+StackFrame* StackwalkerMIPS::GetCallerFrame(const CallStack* stack,
+                                            bool stack_scan_allowed) {
+  if (!memory_ || !stack) {
+    BPLOG(ERROR) << "Can't get caller frame without memory or stack";
+    return NULL;
+  }
+
+  const vector<StackFrame*>& frames = *stack->frames();
+  StackFrameMIPS* last_frame = static_cast<StackFrameMIPS*>(frames.back());
+  scoped_ptr<StackFrameMIPS> new_frame;
+
+  // See if there is DWARF call frame information covering this address.
+  scoped_ptr<CFIFrameInfo> cfi_frame_info(
+    frame_symbolizer_->FindCFIFrameInfo(last_frame));
+  if (cfi_frame_info.get())
+    new_frame.reset(GetCallerByCFIFrameInfo(frames, cfi_frame_info.get()));
+
+  // If caller frame is not found in CFI try analyzing the stack.
+  if (stack_scan_allowed && !new_frame.get()) {
+    new_frame.reset(GetCallerByStackScan(frames));
+  }
+
+  // If nothing worked, tell the caller.
+  if (!new_frame.get()) {
+    return NULL;
+  }
+
+  // Should we terminate the stack walk? (end-of-stack or broken invariant)
+  if (TerminateWalk(new_frame->context.epc,
+                    new_frame->context.iregs[MD_CONTEXT_MIPS_REG_SP],
+                    last_frame->context.iregs[MD_CONTEXT_MIPS_REG_SP],
+                    /*first_unwind=*/last_frame->trust ==
+                        StackFrame::FRAME_TRUST_CONTEXT)) {
+    return NULL;
+  }
+
+  return new_frame.release();
+}
+
+StackFrameMIPS* StackwalkerMIPS::GetCallerByStackScan(
+    const vector<StackFrame*>& frames) {
+  const uint32_t kMaxFrameStackSize = 1024;
+  const uint32_t kMinArgsOnStack = 4;
+
+  StackFrameMIPS* last_frame = static_cast<StackFrameMIPS*>(frames.back());
+
+  if (context_->context_flags & MD_CONTEXT_MIPS) {
+    uint32_t last_sp = last_frame->context.iregs[MD_CONTEXT_MIPS_REG_SP];
+    uint32_t caller_pc, caller_sp, caller_fp;
+
+    // Return address cannot be obtained directly.
+    // Force stackwalking.
+
+    // We cannot use frame pointer to get the return address.
+    // We'll scan the stack for a
+    // return address. This can happen if last_frame is executing code
+    // for a module for which we don't have symbols.
+    int count = kMaxFrameStackSize / sizeof(caller_pc);
+
+    if (frames.size() > 1) {
+      // In case of mips32 ABI stack frame of a nonleaf function
+      // must have minimum stack frame assigned for 4 arguments (4 words).
+      // Move stack pointer for 4 words to avoid reporting non-existing frames
+      // for all frames except the topmost one.
+      // There is no way of knowing if topmost frame belongs to a leaf or
+      // a nonleaf function.
+      last_sp +=  kMinArgsOnStack * sizeof(caller_pc);
+      // Adjust 'count' so that return address is scanned only in limits
+      // of one stack frame.
+      count -= kMinArgsOnStack;
+    }
+
+    do {
+      // Scanning for return address from stack pointer of the last frame.
+      if (!ScanForReturnAddress(last_sp, &caller_sp, &caller_pc, count)) {
+        // If we can't find an instruction pointer even with stack scanning,
+        // give up.
+        BPLOG(ERROR) << " ScanForReturnAddress failed ";
+        return NULL;
+      }
+      // Get $fp stored in the stack frame.
+      if (!memory_->GetMemoryAtAddress(caller_sp - sizeof(caller_pc),
+          &caller_fp)) {
+        BPLOG(INFO) << " GetMemoryAtAddress for fp failed " ;
+        return NULL;
+      }
+
+      count = count - (caller_sp - last_sp) / sizeof(caller_pc);
+      // Now scan the next address in the stack.
+      last_sp = caller_sp + sizeof(caller_pc);
+    } while ((caller_fp - caller_sp >= kMaxFrameStackSize) && count > 0);
+
+    if (!count) {
+      BPLOG(INFO) << " No frame found " ;
+      return NULL;
+    }
+
+    // ScanForReturnAddress found a reasonable return address. Advance
+    // $sp to the location above the one where the return address was
+    // found.
+    caller_sp += sizeof(caller_pc);
+    // caller_pc is actually containing $ra value;
+    // $pc is two instructions before $ra,
+    // so the caller_pc needs to be decremented accordingly.
+    caller_pc -= 2 * sizeof(caller_pc);
+
+    // Create a new stack frame (ownership will be transferred to the caller)
+    // and fill it in.
+    StackFrameMIPS* frame = new StackFrameMIPS();
+    frame->trust = StackFrame::FRAME_TRUST_SCAN;
+    frame->context = last_frame->context;
+    frame->context.epc = caller_pc;
+    frame->context_validity |= StackFrameMIPS::CONTEXT_VALID_PC;
+    frame->instruction = caller_pc;
+
+    frame->context.iregs[MD_CONTEXT_MIPS_REG_SP] = caller_sp;
+    frame->context_validity |= StackFrameMIPS::CONTEXT_VALID_SP;
+    frame->context.iregs[MD_CONTEXT_MIPS_REG_FP] = caller_fp;
+    frame->context_validity |= StackFrameMIPS::CONTEXT_VALID_FP;
+
+    frame->context.iregs[MD_CONTEXT_MIPS_REG_RA] =
+        caller_pc + 2 * sizeof(caller_pc);
+    frame->context_validity |= StackFrameMIPS::CONTEXT_VALID_RA;
+
+    return frame;
+  } else {
+    uint64_t last_sp = last_frame->context.iregs[MD_CONTEXT_MIPS_REG_SP];
+    uint64_t caller_pc, caller_sp, caller_fp;
+
+    // Return address cannot be obtained directly.
+    // Force stackwalking.
+
+    // We cannot use frame pointer to get the return address.
+    // We'll scan the stack for a
+    // return address. This can happen if last_frame is executing code
+    // for a module for which we don't have symbols.
+    int count = kMaxFrameStackSize / sizeof(caller_pc);
+
+    do {
+      // Scanning for return address from stack pointer of the last frame.
+      if (!ScanForReturnAddress(last_sp, &caller_sp, &caller_pc, count)) {
+        // If we can't find an instruction pointer even with stack scanning,
+        // give up.
+        BPLOG(ERROR) << " ScanForReturnAddress failed ";
+        return NULL;
+      }
+      // Get $fp stored in the stack frame.
+      if (!memory_->GetMemoryAtAddress(caller_sp - sizeof(caller_pc),
+          &caller_fp)) {
+        BPLOG(INFO) << " GetMemoryAtAddress for fp failed " ;
+        return NULL;
+      }
+
+      count = count - (caller_sp - last_sp) / sizeof(caller_pc);
+      // Now scan the next address in the stack.
+      last_sp = caller_sp + sizeof(caller_pc);
+    } while ((caller_fp - caller_sp >= kMaxFrameStackSize) && count > 0);
+
+    if (!count) {
+      BPLOG(INFO) << " No frame found " ;
+      return NULL;
+    }
+
+    // ScanForReturnAddress found a reasonable return address. Advance
+    // $sp to the location above the one where the return address was
+    // found.
+    caller_sp += sizeof(caller_pc);
+    // caller_pc is actually containing $ra value;
+    // $pc is two instructions before $ra,
+    // so the caller_pc needs to be decremented accordingly.
+    caller_pc -= 2 * sizeof(caller_pc);
+
+    // Create a new stack frame (ownership will be transferred to the caller)
+    // and fill it in.
+    StackFrameMIPS* frame = new StackFrameMIPS();
+    frame->trust = StackFrame::FRAME_TRUST_SCAN;
+    frame->context = last_frame->context;
+    frame->context.epc = caller_pc;
+    frame->context_validity |= StackFrameMIPS::CONTEXT_VALID_PC;
+    frame->instruction = caller_pc;
+
+    frame->context.iregs[MD_CONTEXT_MIPS_REG_SP] = caller_sp;
+    frame->context_validity |= StackFrameMIPS::CONTEXT_VALID_SP;
+    frame->context.iregs[MD_CONTEXT_MIPS_REG_FP] = caller_fp;
+    frame->context_validity |= StackFrameMIPS::CONTEXT_VALID_FP;
+
+    frame->context.iregs[MD_CONTEXT_MIPS_REG_RA] =
+        caller_pc + 2 * sizeof(caller_pc);
+    frame->context_validity |= StackFrameMIPS::CONTEXT_VALID_RA;
+
+    return frame;
+  }
+}
+
+}  // namespace google_breakpad
+