[mips64] Support for mips n64

src/processor/stackwalker_mips.cc

 // 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
@@ skipping 35 matching lines @@
 #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_ && memory_->GetBase() + memory_->GetSize() - 1 > 0xffffffff) {
-    BPLOG(ERROR) << "Memory out of range for stackwalking: "
-                 << HexString(memory_->GetBase())
-                 << "+"
-                 << HexString(memory_->GetSize());
-    memory_ = NULL;
+: Stackwalker(system_info, memory, modules, resolver_helper),
+  context_(context) {
+  if (context_->context_flags & MD_CONTEXT_MIPS64 ) {
+    if ((memory_ && memory_->GetBase() + memory_->GetSize() - 1)
+        > 0xffffffffffffffff) {
+      BPLOG(ERROR) << "Memory out of range for stackwalking mips64: "
+          << HexString(memory_->GetBase())
+          << "+"
+          << HexString(memory_->GetSize());
+      memory_ = NULL;
+    }
+  } else {
+    if ((memory_ && memory_->GetBase() + memory_->GetSize() - 1) > 0xffffffff) {
+      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();
@@ skipping 15 matching lines @@
    "$s4",   "$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());
 
-  uint32_t sp = 0, pc = 0;
+  if (context_->context_flags & MD_CONTEXT_MIPS) {
+    uint32_t sp = 0, 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;
+    // 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];
+    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()) {
+      sp = entry->second;
+      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 sp = 0, 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()) {
+      sp = entry->second;
+      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();
   }
-
-  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()) {
-    sp = entry->second;
-    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();
 }
 
 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();
@@ skipping 21 matching lines @@
     return NULL;
   }
 
   // If the new stack pointer is at a lower address than the old, then
   // that's clearly incorrect. Treat this as end-of-stack to enforce
   // progress and avoid infinite loops.
   if (new_frame->context.iregs[MD_CONTEXT_MIPS_REG_SP] <=
       last_frame->context.iregs[MD_CONTEXT_MIPS_REG_SP]) {
     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());
 
-  uint32_t last_sp = last_frame->context.iregs[MD_CONTEXT_MIPS_REG_SP];
-  uint32_t caller_pc, caller_sp, caller_fp;
+  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.
+    // 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);
+    // 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) {
+    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 
+      // 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 " ;
+    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;
     }
 
-    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);
+    // 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);
 
-  if (!count) {
-    BPLOG(INFO) << " No frame found " ;
-    return NULL;
+    // 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;
   }
-
-  // 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