Add contib/libs/breakpad to export

commit_hash:9d85255f8d9249f14105e4626bf4484805b8aed4

1 files changed, 299 insertions, 0 deletions

diff --git a/contrib/libs/breakpad/src/processor/stackwalker_arm.cc b/contrib/libs/breakpad/src/processor/stackwalker_arm.cc
new file mode 100644
index 0000000000..7890cbe3ea
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+++ b/contrib/libs/breakpad/src/processor/stackwalker_arm.cc
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+// Copyright (c) 2010 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_arm.cc: arm-specific stackwalker.
+//
+// See stackwalker_arm.h for documentation.
+//
+// Author: Mark Mentovai, Ted Mielczarek, Jim Blandy
+
+#include <vector>
+
+#include "common/scoped_ptr.h"
+#include "google_breakpad/processor/call_stack.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 "google_breakpad/processor/system_info.h"
+#include "processor/cfi_frame_info.h"
+#include "processor/logging.h"
+#include "processor/stackwalker_arm.h"
+
+namespace google_breakpad {
+
+
+StackwalkerARM::StackwalkerARM(const SystemInfo* system_info,
+                               const MDRawContextARM* context,
+                               int fp_register,
+                               MemoryRegion* memory,
+                               const CodeModules* modules,
+                               StackFrameSymbolizer* resolver_helper)
+    : Stackwalker(system_info, memory, modules, resolver_helper),
+      context_(context), fp_register_(fp_register),
+      context_frame_validity_(StackFrameARM::CONTEXT_VALID_ALL) { }
+
+
+StackFrame* StackwalkerARM::GetContextFrame() {
+  if (!context_) {
+    BPLOG(ERROR) << "Can't get context frame without context";
+    return NULL;
+  }
+
+  StackFrameARM* frame = new StackFrameARM();
+
+  // The instruction pointer is stored directly in a register (r15), so pull it
+  // straight out of the CPU context structure.
+  frame->context = *context_;
+  frame->context_validity = context_frame_validity_;
+  frame->trust = StackFrame::FRAME_TRUST_CONTEXT;
+  frame->instruction = frame->context.iregs[MD_CONTEXT_ARM_REG_PC];
+
+  return frame;
+}
+
+StackFrameARM* StackwalkerARM::GetCallerByCFIFrameInfo(
+    const vector<StackFrame*>& frames,
+    CFIFrameInfo* cfi_frame_info) {
+  StackFrameARM* last_frame = static_cast<StackFrameARM*>(frames.back());
+
+  static const char* register_names[] = {
+    "r0",  "r1",  "r2",  "r3",  "r4",  "r5",  "r6",  "r7",
+    "r8",  "r9",  "r10", "r11", "r12", "sp",  "lr",  "pc",
+    "f0",  "f1",  "f2",  "f3",  "f4",  "f5",  "f6",  "f7",
+    "fps", "cpsr",
+    NULL
+  };
+
+  // Populate a dictionary with the valid register values in last_frame.
+  CFIFrameInfo::RegisterValueMap<uint32_t> callee_registers;
+  for (int i = 0; register_names[i]; i++)
+    if (last_frame->context_validity & StackFrameARM::RegisterValidFlag(i))
+      callee_registers[register_names[i]] = last_frame->context.iregs[i];
+
+  // Use the STACK CFI data to recover the caller's register values.
+  CFIFrameInfo::RegisterValueMap<uint32_t> caller_registers;
+  if (!cfi_frame_info->FindCallerRegs(callee_registers, *memory_,
+                                      &caller_registers))
+    return NULL;
+
+  // Construct a new stack frame given the values the CFI recovered.
+  scoped_ptr<StackFrameARM> frame(new StackFrameARM());
+  for (int i = 0; register_names[i]; i++) {
+    CFIFrameInfo::RegisterValueMap<uint32_t>::iterator entry =
+      caller_registers.find(register_names[i]);
+    if (entry != caller_registers.end()) {
+      // We recovered the value of this register; fill the context with the
+      // value from caller_registers.
+      frame->context_validity |= StackFrameARM::RegisterValidFlag(i);
+      frame->context.iregs[i] = entry->second;
+    } else if (4 <= i && i <= 11 && (last_frame->context_validity &
+                                     StackFrameARM::RegisterValidFlag(i))) {
+      // If the STACK CFI data doesn't mention some callee-saves register, and
+      // it is valid in the callee, assume the callee has not yet changed it.
+      // Registers r4 through r11 are callee-saves, according to the Procedure
+      // Call Standard for the ARM Architecture, which the Linux ABI follows.
+      frame->context_validity |= StackFrameARM::RegisterValidFlag(i);
+      frame->context.iregs[i] = last_frame->context.iregs[i];
+    }
+  }
+  // If the CFI doesn't recover the PC explicitly, then use .ra.
+  if (!(frame->context_validity & StackFrameARM::CONTEXT_VALID_PC)) {
+    CFIFrameInfo::RegisterValueMap<uint32_t>::iterator entry =
+      caller_registers.find(".ra");
+    if (entry != caller_registers.end()) {
+      if (fp_register_ == -1) {
+        frame->context_validity |= StackFrameARM::CONTEXT_VALID_PC;
+        frame->context.iregs[MD_CONTEXT_ARM_REG_PC] = entry->second;
+      } else {
+        // The CFI updated the link register and not the program counter.
+        // Handle getting the program counter from the link register.
+        frame->context_validity |= StackFrameARM::CONTEXT_VALID_PC;
+        frame->context_validity |= StackFrameARM::CONTEXT_VALID_LR;
+        frame->context.iregs[MD_CONTEXT_ARM_REG_LR] = entry->second;
+        frame->context.iregs[MD_CONTEXT_ARM_REG_PC] =
+            last_frame->context.iregs[MD_CONTEXT_ARM_REG_LR];
+      }
+    }
+  }
+  // If the CFI doesn't recover the SP explicitly, then use .cfa.
+  if (!(frame->context_validity & StackFrameARM::CONTEXT_VALID_SP)) {
+    CFIFrameInfo::RegisterValueMap<uint32_t>::iterator entry =
+      caller_registers.find(".cfa");
+    if (entry != caller_registers.end()) {
+      frame->context_validity |= StackFrameARM::CONTEXT_VALID_SP;
+      frame->context.iregs[MD_CONTEXT_ARM_REG_SP] = entry->second;
+    }
+  }
+
+  // If we didn't recover the PC and the SP, then the frame isn't very useful.
+  static const int essentials = (StackFrameARM::CONTEXT_VALID_SP
+                                 | StackFrameARM::CONTEXT_VALID_PC);
+  if ((frame->context_validity & essentials) != essentials)
+    return NULL;
+
+  frame->trust = StackFrame::FRAME_TRUST_CFI;
+  return frame.release();
+}
+
+StackFrameARM* StackwalkerARM::GetCallerByStackScan(
+    const vector<StackFrame*>& frames) {
+  StackFrameARM* last_frame = static_cast<StackFrameARM*>(frames.back());
+  uint32_t last_sp = last_frame->context.iregs[MD_CONTEXT_ARM_REG_SP];
+  uint32_t caller_sp, caller_pc;
+
+  if (!ScanForReturnAddress(last_sp, &caller_sp, &caller_pc,
+                            /*is_context_frame=*/last_frame->trust ==
+                                StackFrame::FRAME_TRUST_CONTEXT)) {
+    // No plausible return address was 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 += 4;
+
+  // Create a new stack frame (ownership will be transferred to the caller)
+  // and fill it in.
+  StackFrameARM* frame = new StackFrameARM();
+
+  frame->trust = StackFrame::FRAME_TRUST_SCAN;
+  frame->context = last_frame->context;
+  frame->context.iregs[MD_CONTEXT_ARM_REG_PC] = caller_pc;
+  frame->context.iregs[MD_CONTEXT_ARM_REG_SP] = caller_sp;
+  frame->context_validity = StackFrameARM::CONTEXT_VALID_PC |
+                            StackFrameARM::CONTEXT_VALID_SP;
+
+  return frame;
+}
+
+StackFrameARM* StackwalkerARM::GetCallerByFramePointer(
+    const vector<StackFrame*>& frames) {
+  StackFrameARM* last_frame = static_cast<StackFrameARM*>(frames.back());
+
+  if (!(last_frame->context_validity &
+        StackFrameARM::RegisterValidFlag(fp_register_))) {
+    return NULL;
+  }
+
+  uint32_t last_fp = last_frame->context.iregs[fp_register_];
+
+  uint32_t caller_fp = 0;
+  if (last_fp && !memory_->GetMemoryAtAddress(last_fp, &caller_fp)) {
+    BPLOG(ERROR) << "Unable to read caller_fp from last_fp: 0x"
+                 << std::hex << last_fp;
+    return NULL;
+  }
+
+  uint32_t caller_lr = 0;
+  if (last_fp && !memory_->GetMemoryAtAddress(last_fp + 4, &caller_lr)) {
+    BPLOG(ERROR) << "Unable to read caller_lr from last_fp + 4: 0x"
+                 << std::hex << (last_fp + 4);
+    return NULL;
+  }
+
+  uint32_t caller_sp = last_fp ? last_fp + 8 :
+      last_frame->context.iregs[MD_CONTEXT_ARM_REG_SP];
+
+  // Create a new stack frame (ownership will be transferred to the caller)
+  // and fill it in.
+  StackFrameARM* frame = new StackFrameARM();
+
+  frame->trust = StackFrame::FRAME_TRUST_FP;
+  frame->context = last_frame->context;
+  frame->context.iregs[fp_register_] = caller_fp;
+  frame->context.iregs[MD_CONTEXT_ARM_REG_SP] = caller_sp;
+  frame->context.iregs[MD_CONTEXT_ARM_REG_PC] =
+      last_frame->context.iregs[MD_CONTEXT_ARM_REG_LR];
+  frame->context.iregs[MD_CONTEXT_ARM_REG_LR] = caller_lr;
+  frame->context_validity = StackFrameARM::CONTEXT_VALID_PC |
+                            StackFrameARM::CONTEXT_VALID_LR |
+                            StackFrameARM::RegisterValidFlag(fp_register_) |
+                            StackFrameARM::CONTEXT_VALID_SP;
+  return frame;
+}
+
+StackFrame* StackwalkerARM::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();
+  StackFrameARM* last_frame = static_cast<StackFrameARM*>(frames.back());
+  scoped_ptr<StackFrameARM> frame;
+
+  // See if there is DWARF call frame information covering this address.
+  // TODO(jperaza): Ignore iOS CFI info until it is properly collected.
+  // https://bugs.chromium.org/p/google-breakpad/issues/detail?id=764
+  if (!system_info_ || system_info_->os != "iOS") {
+    scoped_ptr<CFIFrameInfo> cfi_frame_info(
+        frame_symbolizer_->FindCFIFrameInfo(last_frame));
+    if (cfi_frame_info.get())
+      frame.reset(GetCallerByCFIFrameInfo(frames, cfi_frame_info.get()));
+  }
+
+  // If CFI failed, or there wasn't CFI available, fall back
+  // to frame pointer, if this is configured.
+  if (fp_register_ >= 0 && !frame.get())
+    frame.reset(GetCallerByFramePointer(frames));
+
+  // If everuthing failed, fall back to stack scanning.
+  if (stack_scan_allowed && !frame.get())
+    frame.reset(GetCallerByStackScan(frames));
+
+  // If nothing worked, tell the caller.
+  if (!frame.get())
+    return NULL;
+
+  // Should we terminate the stack walk? (end-of-stack or broken invariant)
+  if (TerminateWalk(frame->context.iregs[MD_CONTEXT_ARM_REG_PC],
+                    frame->context.iregs[MD_CONTEXT_ARM_REG_SP],
+                    last_frame->context.iregs[MD_CONTEXT_ARM_REG_SP],
+                    /*first_unwind=*/last_frame->trust ==
+                        StackFrame::FRAME_TRUST_CONTEXT)) {
+    return NULL;
+  }
+
+  // The new frame's context's PC is the return address, which is one
+  // instruction past the instruction that caused us to arrive at the
+  // callee. Set new_frame->instruction to one less than the PC. This won't
+  // reference the beginning of the call instruction, but it's at least
+  // within it, which is sufficient to get the source line information to
+  // match up with the line that contains the function call. Callers that
+  // require the exact return address value may access
+  // frame->context.iregs[MD_CONTEXT_ARM_REG_PC].
+  frame->instruction = frame->context.iregs[MD_CONTEXT_ARM_REG_PC] - 2;
+
+  return frame.release();
+}
+
+
+}  // namespace google_breakpad