From 76c51742c9e7ad8ab137e5dab1852798fc532207 Mon Sep 17 00:00:00 2001 From: Mike Frysinger Date: Sat, 6 Feb 2016 18:58:39 -0500 Subject: [mips64] Support for mips n64 Adding remaining mips n64 support including stackwalker. BUG=None TEST=manually tested on Linux/Android R=vapier@chromium.org Review URL: https://codereview.chromium.org/1418453011 . --- src/processor/stackwalker_mips.cc | 400 ++++++++++++++++++++++++++------------ 1 file changed, 274 insertions(+), 126 deletions(-) (limited to 'src/processor/stackwalker_mips.cc') diff --git a/src/processor/stackwalker_mips.cc b/src/processor/stackwalker_mips.cc index 7db34219..db55d460 100644 --- a/src/processor/stackwalker_mips.cc +++ b/src/processor/stackwalker_mips.cc @@ -53,14 +53,25 @@ StackwalkerMIPS::StackwalkerMIPS(const SystemInfo* system_info, 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; + } } } @@ -96,73 +107,143 @@ StackFrameMIPS* StackwalkerMIPS::GetCallerByCFIFrameInfo( CFIFrameInfo* cfi_frame_info) { StackFrameMIPS* last_frame = static_cast(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 callee_registers; - // Use the STACK CFI data to recover the caller's register values. - CFIFrameInfo::RegisterValueMap caller_registers; + // Populate a dictionary with the valid register values in last_frame. + CFIFrameInfo::RegisterValueMap callee_registers; + // Use the STACK CFI data to recover the caller's register values. + CFIFrameInfo::RegisterValueMap 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; - } + if (!cfi_frame_info->FindCallerRegs(callee_registers, *memory_, + &caller_registers)) { + return NULL; + } - CFIFrameInfo::RegisterValueMap::const_iterator entry = - caller_registers.find(".cfa"); + CFIFrameInfo::RegisterValueMap::const_iterator entry = + caller_registers.find(".cfa"); - if (entry != caller_registers.end()) { - sp = entry->second; - caller_registers["$sp"] = entry->second; - } + if (entry != caller_registers.end()) { + sp = entry->second; + caller_registers["$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 frame(new StackFrameMIPS()); - - for (int i = 0; kRegisterNames[i]; ++i) { - CFIFrameInfo::RegisterValueMap::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, $s8 - frame->context.iregs[i] = last_frame->context.iregs[i]; - frame->context_validity |= StackFrameMIPS::RegisterValidFlag(i); + entry = caller_registers.find(".ra"); + if (entry != caller_registers.end()) { + caller_registers["$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 frame(new StackFrameMIPS()); + + for (int i = 0; kRegisterNames[i]; ++i) { + CFIFrameInfo::RegisterValueMap::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->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["$ra"]; - frame->context_validity |= StackFrameMIPS::CONTEXT_VALID_RA; + frame->trust = StackFrame::FRAME_TRUST_CFI; - frame->trust = StackFrame::FRAME_TRUST_CFI; + return frame.release(); + } else { + uint64_t sp = 0, pc = 0; + + // Populate a dictionary with the valid register values in last_frame. + CFIFrameInfo::RegisterValueMap callee_registers; + // Use the STACK CFI data to recover the caller's register values. + CFIFrameInfo::RegisterValueMap caller_registers; + + for (int i = 0; kRegisterNames[i]; ++i) { + caller_registers[kRegisterNames[i]] = last_frame->context.iregs[i]; + callee_registers[kRegisterNames[i]] = last_frame->context.iregs[i]; + } - return frame.release(); + if (!cfi_frame_info->FindCallerRegs(callee_registers, *memory_, + &caller_registers)) { + return NULL; + } + + CFIFrameInfo::RegisterValueMap::const_iterator entry = + caller_registers.find(".cfa"); + + if (entry != caller_registers.end()) { + sp = entry->second; + caller_registers["$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 frame(new StackFrameMIPS()); + + for (int i = 0; kRegisterNames[i]; ++i) { + CFIFrameInfo::RegisterValueMap::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, @@ -204,7 +285,7 @@ StackFrame* StackwalkerMIPS::GetCallerFrame(const CallStack* stack, last_frame->context.iregs[MD_CONTEXT_MIPS_REG_SP]) { return NULL; } - + return new_frame.release(); } @@ -215,19 +296,20 @@ StackFrameMIPS* StackwalkerMIPS::GetCallerByStackScan( StackFrameMIPS* last_frame = static_cast(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 @@ -235,65 +317,131 @@ StackFrameMIPS* StackwalkerMIPS::GetCallerByStackScan( // 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 "; + 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; } - // Get $fp stored in the stack frame. - if (!memory_->GetMemoryAtAddress(caller_sp - sizeof(caller_pc), - &caller_fp)) { - BPLOG(INFO) << " GetMemoryAtAddress for fp failed " ; + + // 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; } - 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 -- cgit v1.2.1