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Diffstat (limited to 'externals/breakpad/src/processor/stackwalker_arm64.cc')
| -rw-r--r-- | externals/breakpad/src/processor/stackwalker_arm64.cc | 357 |
1 files changed, 0 insertions, 357 deletions
diff --git a/externals/breakpad/src/processor/stackwalker_arm64.cc b/externals/breakpad/src/processor/stackwalker_arm64.cc deleted file mode 100644 index 0fa02e04f1..0000000000 --- a/externals/breakpad/src/processor/stackwalker_arm64.cc +++ /dev/null @@ -1,357 +0,0 @@ -// Copyright 2013 Google LLC -// -// 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 LLC 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_arm64.cc: arm64-specific stackwalker. -// -// See stackwalker_arm64.h for documentation. -// -// Author: Mark Mentovai, Ted Mielczarek, Jim Blandy, Colin Blundell - -#ifdef HAVE_CONFIG_H -#include <config.h> // Must come first -#endif - -#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 "processor/cfi_frame_info.h" -#include "processor/logging.h" -#include "processor/stackwalker_arm64.h" - -namespace google_breakpad { - - -StackwalkerARM64::StackwalkerARM64(const SystemInfo* system_info, - const MDRawContextARM64* context, - MemoryRegion* memory, - const CodeModules* modules, - StackFrameSymbolizer* resolver_helper) - : Stackwalker(system_info, memory, modules, resolver_helper), - context_(context), - context_frame_validity_(StackFrameARM64::CONTEXT_VALID_ALL), - address_range_mask_(0xffffffffffffffff) { - if (modules && modules->module_count() > 0) { - // ARM64 supports storing pointer authentication codes in the upper bits of - // a pointer. Make a best guess at the range of valid addresses based on the - // range of loaded modules. - const CodeModule *high_module = - modules->GetModuleAtSequence(modules->module_count() - 1); - uint64_t mask = high_module->base_address() + high_module->size(); - mask |= mask >> 1; - mask |= mask >> 2; - mask |= mask >> 4; - mask |= mask >> 8; - mask |= mask >> 16; - mask |= mask >> 32; - address_range_mask_ = mask; - } -} - -uint64_t StackwalkerARM64::PtrauthStrip(uint64_t ptr) { - uint64_t stripped = ptr & address_range_mask_; - return modules_ && modules_->GetModuleForAddress(stripped) ? stripped : ptr; -} - -StackFrame* StackwalkerARM64::GetContextFrame() { - if (!context_) { - BPLOG(ERROR) << "Can't get context frame without context"; - return NULL; - } - - StackFrameARM64* frame = new StackFrameARM64(); - - // The instruction pointer is stored directly in a register (x32), 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_ARM64_REG_PC]; - frame->context.iregs[MD_CONTEXT_ARM64_REG_LR] = - PtrauthStrip(frame->context.iregs[MD_CONTEXT_ARM64_REG_LR]); - - return frame; -} - -StackFrameARM64* StackwalkerARM64::GetCallerByCFIFrameInfo( - const vector<StackFrame*>& frames, - CFIFrameInfo* cfi_frame_info) { - StackFrameARM64* last_frame = static_cast<StackFrameARM64*>(frames.back()); - - static const char* register_names[] = { - "x0", "x1", "x2", "x3", "x4", "x5", "x6", "x7", - "x8", "x9", "x10", "x11", "x12", "x13", "x14", "x15", - "x16", "x17", "x18", "x19", "x20", "x21", "x22", "x23", - "x24", "x25", "x26", "x27", "x28", "x29", "x30", "sp", - "pc", NULL - }; - - // Populate a dictionary with the valid register values in last_frame. - CFIFrameInfo::RegisterValueMap<uint64_t> callee_registers; - for (int i = 0; register_names[i]; i++) { - if (last_frame->context_validity & StackFrameARM64::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<uint64_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<StackFrameARM64> frame(new StackFrameARM64()); - for (int i = 0; register_names[i]; i++) { - CFIFrameInfo::RegisterValueMap<uint64_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 |= StackFrameARM64::RegisterValidFlag(i); - frame->context.iregs[i] = entry->second; - } else if (19 <= i && i <= 29 && (last_frame->context_validity & - StackFrameARM64::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 r19 through r29 are callee-saves, according to the Procedure - // Call Standard for the ARM AARCH64 Architecture, which the Linux ABI - // follows. - frame->context_validity |= StackFrameARM64::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 & StackFrameARM64::CONTEXT_VALID_PC)) { - CFIFrameInfo::RegisterValueMap<uint64_t>::iterator entry = - caller_registers.find(".ra"); - if (entry != caller_registers.end()) { - frame->context_validity |= StackFrameARM64::CONTEXT_VALID_PC; - frame->context.iregs[MD_CONTEXT_ARM64_REG_PC] = entry->second; - } - } - // If the CFI doesn't recover the SP explicitly, then use .cfa. - if (!(frame->context_validity & StackFrameARM64::CONTEXT_VALID_SP)) { - CFIFrameInfo::RegisterValueMap<uint64_t>::iterator entry = - caller_registers.find(".cfa"); - if (entry != caller_registers.end()) { - frame->context_validity |= StackFrameARM64::CONTEXT_VALID_SP; - frame->context.iregs[MD_CONTEXT_ARM64_REG_SP] = entry->second; - } - } - - // If we didn't recover the PC and the SP, then the frame isn't very useful. - static const uint64_t essentials = (StackFrameARM64::CONTEXT_VALID_SP - | StackFrameARM64::CONTEXT_VALID_PC); - if ((frame->context_validity & essentials) != essentials) - return NULL; - - frame->context.iregs[MD_CONTEXT_ARM64_REG_PC] = - PtrauthStrip(frame->context.iregs[MD_CONTEXT_ARM64_REG_PC]); - frame->trust = StackFrame::FRAME_TRUST_CFI; - return frame.release(); -} - -StackFrameARM64* StackwalkerARM64::GetCallerByStackScan( - const vector<StackFrame*>& frames) { - StackFrameARM64* last_frame = static_cast<StackFrameARM64*>(frames.back()); - uint64_t last_sp = last_frame->context.iregs[MD_CONTEXT_ARM64_REG_SP]; - uint64_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 += 8; - - // Create a new stack frame (ownership will be transferred to the caller) - // and fill it in. - StackFrameARM64* frame = new StackFrameARM64(); - - frame->trust = StackFrame::FRAME_TRUST_SCAN; - frame->context = last_frame->context; - frame->context.iregs[MD_CONTEXT_ARM64_REG_PC] = caller_pc; - frame->context.iregs[MD_CONTEXT_ARM64_REG_SP] = caller_sp; - frame->context_validity = StackFrameARM64::CONTEXT_VALID_PC | - StackFrameARM64::CONTEXT_VALID_SP; - - return frame; -} - -StackFrameARM64* StackwalkerARM64::GetCallerByFramePointer( - const vector<StackFrame*>& frames) { - StackFrameARM64* last_frame = static_cast<StackFrameARM64*>(frames.back()); - if (!(last_frame->context_validity & StackFrameARM64::CONTEXT_VALID_LR)) { - CorrectRegLRByFramePointer(frames, last_frame); - } - - uint64_t last_fp = last_frame->context.iregs[MD_CONTEXT_ARM64_REG_FP]; - - uint64_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; - } - - uint64_t caller_lr = 0; - if (last_fp && !memory_->GetMemoryAtAddress(last_fp + 8, &caller_lr)) { - BPLOG(ERROR) << "Unable to read caller_lr from last_fp + 8: 0x" - << std::hex << (last_fp + 8); - return NULL; - } - - caller_lr = PtrauthStrip(caller_lr); - - uint64_t caller_sp = last_fp ? last_fp + 16 : - last_frame->context.iregs[MD_CONTEXT_ARM64_REG_SP]; - - // Create a new stack frame (ownership will be transferred to the caller) - // and fill it in. - StackFrameARM64* frame = new StackFrameARM64(); - - frame->trust = StackFrame::FRAME_TRUST_FP; - frame->context = last_frame->context; - frame->context.iregs[MD_CONTEXT_ARM64_REG_FP] = caller_fp; - frame->context.iregs[MD_CONTEXT_ARM64_REG_SP] = caller_sp; - frame->context.iregs[MD_CONTEXT_ARM64_REG_PC] = - last_frame->context.iregs[MD_CONTEXT_ARM64_REG_LR]; - frame->context.iregs[MD_CONTEXT_ARM64_REG_LR] = caller_lr; - frame->context_validity = StackFrameARM64::CONTEXT_VALID_PC | - StackFrameARM64::CONTEXT_VALID_LR | - StackFrameARM64::CONTEXT_VALID_FP | - StackFrameARM64::CONTEXT_VALID_SP; - return frame; -} - -void StackwalkerARM64::CorrectRegLRByFramePointer( - const vector<StackFrame*>& frames, - StackFrameARM64* last_frame) { - // Need at least two frames to correct and - // register $FP should always be greater than register $SP. - if (frames.size() < 2 || !last_frame || - last_frame->context.iregs[MD_CONTEXT_ARM64_REG_FP] <= - last_frame->context.iregs[MD_CONTEXT_ARM64_REG_SP]) - return; - - // Searching for a real callee frame. Skipping inline frames since they - // don't contain context (and cannot be downcasted to StackFrameARM64). - size_t last_frame_callee_id = frames.size() - 2; - while (last_frame_callee_id >= 0 && frames[last_frame_callee_id]->trust == - StackFrame::FRAME_TRUST_INLINE) { - last_frame_callee_id--; - } - if (last_frame_callee_id < 0) return; - StackFrameARM64* last_frame_callee = - static_cast<StackFrameARM64*>(frames[last_frame_callee_id]); - - uint64_t last_frame_callee_fp = - last_frame_callee->context.iregs[MD_CONTEXT_ARM64_REG_FP]; - - uint64_t last_fp = 0; - if (last_frame_callee_fp && - !memory_->GetMemoryAtAddress(last_frame_callee_fp, &last_fp)) { - BPLOG(ERROR) << "Unable to read last_fp from last_last_fp: 0x" << std::hex - << last_frame_callee_fp; - return; - } - // Give up if STACK CFI doesn't agree with frame pointer. - if (last_frame->context.iregs[MD_CONTEXT_ARM64_REG_FP] != last_fp) - return; - - uint64_t last_lr = 0; - if (last_frame_callee_fp && - !memory_->GetMemoryAtAddress(last_frame_callee_fp + 8, &last_lr)) { - BPLOG(ERROR) << "Unable to read last_lr from (last_last_fp + 8): 0x" - << std::hex << (last_frame_callee_fp + 8); - return; - } - last_lr = PtrauthStrip(last_lr); - - last_frame->context.iregs[MD_CONTEXT_ARM64_REG_LR] = last_lr; -} - -StackFrame* StackwalkerARM64::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(); - StackFrameARM64* last_frame = static_cast<StackFrameARM64*>(frames.back()); - scoped_ptr<StackFrameARM64> 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()) - frame.reset(GetCallerByCFIFrameInfo(frames, cfi_frame_info.get())); - - // If CFI failed, or there wasn't CFI available, fall back to frame pointer. - if (!frame.get()) - frame.reset(GetCallerByFramePointer(frames)); - - // If everything 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_ARM64_REG_PC], - frame->context.iregs[MD_CONTEXT_ARM64_REG_SP], - last_frame->context.iregs[MD_CONTEXT_ARM64_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. - // ARM64 instructions have a uniform 4-byte encoding, so subtracting 4 off - // the return address gets back to the beginning of the call instruction. - // Callers that require the exact return address value may access - // frame->context.iregs[MD_CONTEXT_ARM64_REG_PC]. - frame->instruction = frame->context.iregs[MD_CONTEXT_ARM64_REG_PC] - 4; - - return frame.release(); -} - - -} // namespace google_breakpad |