diff options
Diffstat (limited to 'externals/breakpad/src/processor/stackwalker_riscv64.cc')
| -rw-r--r-- | externals/breakpad/src/processor/stackwalker_riscv64.cc | 539 |
1 files changed, 0 insertions, 539 deletions
diff --git a/externals/breakpad/src/processor/stackwalker_riscv64.cc b/externals/breakpad/src/processor/stackwalker_riscv64.cc deleted file mode 100644 index 0ed7b5e65b..0000000000 --- a/externals/breakpad/src/processor/stackwalker_riscv64.cc +++ /dev/null @@ -1,539 +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_riscv64.cc: riscv64-specific stackwalker. - * - * See stackwalker_riscv64.h for documentation. - * - * Author: Iacopo Colonnelli - */ - -#ifdef HAVE_CONFIG_H -#include <config.h> // Must come first -#endif - -#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/stack_frame_cpu.h" -#include "google_breakpad/processor/system_info.h" -#include "processor/cfi_frame_info.h" -#include "processor/logging.h" -#include "processor/stackwalker_riscv64.h" - -namespace google_breakpad { - -StackwalkerRISCV64::StackwalkerRISCV64(const SystemInfo* system_info, - const MDRawContextRISCV64* context, - MemoryRegion* memory, - const CodeModules* modules, - StackFrameSymbolizer* resolver_helper) - : Stackwalker(system_info, memory, modules, resolver_helper), - context_(context), - context_frame_validity_(StackFrameRISCV::CONTEXT_VALID_ALL) { -} - - -StackFrame* StackwalkerRISCV64::GetContextFrame() { - if (!context_) { - BPLOG(ERROR) << "Can't get context frame without context"; - return NULL; - } - - StackFrameRISCV64* frame = new StackFrameRISCV64(); - - frame->context = *context_; - frame->context_validity = context_frame_validity_; - frame->trust = StackFrame::FRAME_TRUST_CONTEXT; - frame->instruction = frame->context.pc; - - return frame; -} - -StackFrameRISCV64* StackwalkerRISCV64::GetCallerByCFIFrameInfo( - const vector<StackFrame*>& frames, - CFIFrameInfo* cfi_frame_info) { - StackFrameRISCV64* last_frame = - static_cast<StackFrameRISCV64*>(frames.back()); - - // Populate a dictionary with the valid register values in last_frame. - CFIFrameInfo::RegisterValueMap<uint64_t> callee_registers; - if (last_frame->context_validity & StackFrameRISCV64::CONTEXT_VALID_PC) - callee_registers["pc"] = last_frame->context.pc; - if (last_frame->context_validity & StackFrameRISCV64::CONTEXT_VALID_RA) - callee_registers["ra"] = last_frame->context.ra; - if (last_frame->context_validity & StackFrameRISCV64::CONTEXT_VALID_SP) - callee_registers["sp"] = last_frame->context.sp; - if (last_frame->context_validity & StackFrameRISCV64::CONTEXT_VALID_GP) - callee_registers["gp"] = last_frame->context.gp; - if (last_frame->context_validity & StackFrameRISCV64::CONTEXT_VALID_TP) - callee_registers["tp"] = last_frame->context.tp; - if (last_frame->context_validity & StackFrameRISCV64::CONTEXT_VALID_T0) - callee_registers["t0"] = last_frame->context.t0; - if (last_frame->context_validity & StackFrameRISCV64::CONTEXT_VALID_T1) - callee_registers["t1"] = last_frame->context.t1; - if (last_frame->context_validity & StackFrameRISCV64::CONTEXT_VALID_T2) - callee_registers["t2"] = last_frame->context.t2; - if (last_frame->context_validity & StackFrameRISCV64::CONTEXT_VALID_S0) - callee_registers["s0"] = last_frame->context.s0; - if (last_frame->context_validity & StackFrameRISCV64::CONTEXT_VALID_S1) - callee_registers["s1"] = last_frame->context.s1; - if (last_frame->context_validity & StackFrameRISCV64::CONTEXT_VALID_A0) - callee_registers["a0"] = last_frame->context.a0; - if (last_frame->context_validity & StackFrameRISCV64::CONTEXT_VALID_A1) - callee_registers["a1"] = last_frame->context.a1; - if (last_frame->context_validity & StackFrameRISCV64::CONTEXT_VALID_A2) - callee_registers["a2"] = last_frame->context.a2; - if (last_frame->context_validity & StackFrameRISCV64::CONTEXT_VALID_A3) - callee_registers["a3"] = last_frame->context.a3; - if (last_frame->context_validity & StackFrameRISCV64::CONTEXT_VALID_A4) - callee_registers["a4"] = last_frame->context.a4; - if (last_frame->context_validity & StackFrameRISCV64::CONTEXT_VALID_A5) - callee_registers["a5"] = last_frame->context.a5; - if (last_frame->context_validity & StackFrameRISCV64::CONTEXT_VALID_A6) - callee_registers["a6"] = last_frame->context.a6; - if (last_frame->context_validity & StackFrameRISCV64::CONTEXT_VALID_A7) - callee_registers["a7"] = last_frame->context.a7; - if (last_frame->context_validity & StackFrameRISCV64::CONTEXT_VALID_S2) - callee_registers["s2"] = last_frame->context.s2; - if (last_frame->context_validity & StackFrameRISCV64::CONTEXT_VALID_S3) - callee_registers["s3"] = last_frame->context.s3; - if (last_frame->context_validity & StackFrameRISCV64::CONTEXT_VALID_S4) - callee_registers["s4"] = last_frame->context.s4; - if (last_frame->context_validity & StackFrameRISCV64::CONTEXT_VALID_S5) - callee_registers["s5"] = last_frame->context.s5; - if (last_frame->context_validity & StackFrameRISCV64::CONTEXT_VALID_S6) - callee_registers["s6"] = last_frame->context.s6; - if (last_frame->context_validity & StackFrameRISCV64::CONTEXT_VALID_S7) - callee_registers["s7"] = last_frame->context.s7; - if (last_frame->context_validity & StackFrameRISCV64::CONTEXT_VALID_S8) - callee_registers["s8"] = last_frame->context.s8; - if (last_frame->context_validity & StackFrameRISCV64::CONTEXT_VALID_S9) - callee_registers["s9"] = last_frame->context.s9; - if (last_frame->context_validity & StackFrameRISCV64::CONTEXT_VALID_S10) - callee_registers["s10"] = last_frame->context.s10; - if (last_frame->context_validity & StackFrameRISCV64::CONTEXT_VALID_S11) - callee_registers["s11"] = last_frame->context.s11; - if (last_frame->context_validity & StackFrameRISCV64::CONTEXT_VALID_T3) - callee_registers["t3"] = last_frame->context.t3; - if (last_frame->context_validity & StackFrameRISCV64::CONTEXT_VALID_T4) - callee_registers["t4"] = last_frame->context.t4; - if (last_frame->context_validity & StackFrameRISCV64::CONTEXT_VALID_T5) - callee_registers["t5"] = last_frame->context.t5; - if (last_frame->context_validity & StackFrameRISCV64::CONTEXT_VALID_T6) - callee_registers["t6"] = last_frame->context.t6; - - // 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. - CFIFrameInfo::RegisterValueMap<uint64_t>::iterator entry; - scoped_ptr<StackFrameRISCV64> frame(new StackFrameRISCV64()); - entry = caller_registers.find("pc"); - if (entry != caller_registers.end()) { - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_PC; - frame->context.pc = entry->second; - } else{ - // If the CFI doesn't recover the PC explicitly, then use .ra. - entry = caller_registers.find(".ra"); - if (entry != caller_registers.end()) { - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_PC; - frame->context.pc = entry->second; - } - } - entry = caller_registers.find("ra"); - if (entry != caller_registers.end()) { - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_RA; - frame->context.ra = entry->second; - } - entry = caller_registers.find("sp"); - if (entry != caller_registers.end()) { - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_SP; - frame->context.sp = entry->second; - } else { - // If the CFI doesn't recover the SP explicitly, then use .cfa. - entry = caller_registers.find(".cfa"); - if (entry != caller_registers.end()) { - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_SP; - frame->context.sp = entry->second; - } - } - entry = caller_registers.find("gp"); - if (entry != caller_registers.end()) { - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_GP; - frame->context.gp = entry->second; - } - entry = caller_registers.find("tp"); - if (entry != caller_registers.end()) { - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_TP; - frame->context.tp = entry->second; - } - entry = caller_registers.find("t0"); - if (entry != caller_registers.end()) { - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_T0; - frame->context.t0 = entry->second; - } - entry = caller_registers.find("t1"); - if (entry != caller_registers.end()) { - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_T1; - frame->context.t1 = entry->second; - } - entry = caller_registers.find("t2"); - if (entry != caller_registers.end()) { - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_T2; - frame->context.t2 = entry->second; - } - entry = caller_registers.find("s0"); - if (entry != caller_registers.end()) { - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_S0; - frame->context.s0 = entry->second; - } else if (last_frame->context_validity & - StackFrameRISCV64::CONTEXT_VALID_S0) { - // Since the register is callee-saves, assume the callee - // has not yet changed it. - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_S0; - frame->context.s0 = last_frame->context.s0; - } - entry = caller_registers.find("s1"); - if (entry != caller_registers.end()) { - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_S1; - frame->context.s1 = entry->second; - } else if (last_frame->context_validity & - StackFrameRISCV64::CONTEXT_VALID_S1) { - // Since the register is callee-saves, assume the callee - // has not yet changed it. - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_S1; - frame->context.s1 = last_frame->context.s1; - } - entry = caller_registers.find("a0"); - if (entry != caller_registers.end()) { - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_A0; - frame->context.a0 = entry->second; - } - entry = caller_registers.find("a1"); - if (entry != caller_registers.end()) { - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_A1; - frame->context.a1 = entry->second; - } - entry = caller_registers.find("a2"); - if (entry != caller_registers.end()) { - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_A2; - frame->context.a2 = entry->second; - } - entry = caller_registers.find("a3"); - if (entry != caller_registers.end()) { - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_A3; - frame->context.a3 = entry->second; - } - entry = caller_registers.find("a4"); - if (entry != caller_registers.end()) { - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_A4; - frame->context.a4 = entry->second; - } - entry = caller_registers.find("a5"); - if (entry != caller_registers.end()) { - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_A5; - frame->context.a5 = entry->second; - } - entry = caller_registers.find("a6"); - if (entry != caller_registers.end()) { - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_A6; - frame->context.a6 = entry->second; - } - entry = caller_registers.find("a7"); - if (entry != caller_registers.end()) { - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_A7; - frame->context.a7 = entry->second; - } - entry = caller_registers.find("s2"); - if (entry != caller_registers.end()) { - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_S2; - frame->context.s2 = entry->second; - } else if (last_frame->context_validity & - StackFrameRISCV64::CONTEXT_VALID_S2) { - // Since the register is callee-saves, assume the callee - // has not yet changed it. - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_S2; - frame->context.s2 = last_frame->context.s2; - } - entry = caller_registers.find("s3"); - if (entry != caller_registers.end()) { - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_S3; - frame->context.s3 = entry->second; - } else if (last_frame->context_validity & - StackFrameRISCV64::CONTEXT_VALID_S3) { - // Since the register is callee-saves, assume the callee - // has not yet changed it. - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_S3; - frame->context.s3 = last_frame->context.s3; - } - entry = caller_registers.find("s4"); - if (entry != caller_registers.end()) { - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_S4; - frame->context.s4 = entry->second; - } else if (last_frame->context_validity & - StackFrameRISCV64::CONTEXT_VALID_S4) { - // Since the register is callee-saves, assume the callee - // has not yet changed it. - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_S4; - frame->context.s4 = last_frame->context.s4; - } - entry = caller_registers.find("s5"); - if (entry != caller_registers.end()) { - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_S5; - frame->context.s5 = entry->second; - } else if (last_frame->context_validity & - StackFrameRISCV64::CONTEXT_VALID_S5) { - // Since the register is callee-saves, assume the callee - // has not yet changed it. - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_S5; - frame->context.s5 = last_frame->context.s5; - } - entry = caller_registers.find("s6"); - if (entry != caller_registers.end()) { - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_S6; - frame->context.s6 = entry->second; - } else if (last_frame->context_validity & - StackFrameRISCV64::CONTEXT_VALID_S6) { - // Since the register is callee-saves, assume the callee - // has not yet changed it. - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_S6; - frame->context.s6 = last_frame->context.s6; - } - entry = caller_registers.find("s7"); - if (entry != caller_registers.end()) { - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_S7; - frame->context.s7 = entry->second; - } else if (last_frame->context_validity & - StackFrameRISCV64::CONTEXT_VALID_S7) { - // Since the register is callee-saves, assume the callee - // has not yet changed it. - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_S7; - frame->context.s7 = last_frame->context.s7; - } - entry = caller_registers.find("s8"); - if (entry != caller_registers.end()) { - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_S8; - frame->context.s8 = entry->second; - } else if (last_frame->context_validity & - StackFrameRISCV64::CONTEXT_VALID_S8) { - // Since the register is callee-saves, assume the callee - // has not yet changed it. - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_S8; - frame->context.s8 = last_frame->context.s8; - } - entry = caller_registers.find("s9"); - if (entry != caller_registers.end()) { - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_S9; - frame->context.s9 = entry->second; - } else if (last_frame->context_validity & - StackFrameRISCV64::CONTEXT_VALID_S9) { - // Since the register is callee-saves, assume the callee - // has not yet changed it. - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_S9; - frame->context.s9 = last_frame->context.s9; - } - entry = caller_registers.find("s10"); - if (entry != caller_registers.end()) { - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_S10; - frame->context.s10 = entry->second; - } else if (last_frame->context_validity & - StackFrameRISCV64::CONTEXT_VALID_S10) { - // Since the register is callee-saves, assume the callee - // has not yet changed it. - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_S10; - frame->context.s10 = last_frame->context.s10; - } - entry = caller_registers.find("s11"); - if (entry != caller_registers.end()) { - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_S11; - frame->context.s11 = entry->second; - } else if (last_frame->context_validity & - StackFrameRISCV64::CONTEXT_VALID_S11) { - // Since the register is callee-saves, assume the callee - // has not yet changed it. - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_S11; - frame->context.s11 = last_frame->context.s11; - } - entry = caller_registers.find("t3"); - if (entry != caller_registers.end()) { - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_T3; - frame->context.t3 = entry->second; - } - entry = caller_registers.find("t4"); - if (entry != caller_registers.end()) { - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_T4; - frame->context.t4 = entry->second; - } - entry = caller_registers.find("t5"); - if (entry != caller_registers.end()) { - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_T5; - frame->context.t5 = entry->second; - } - entry = caller_registers.find("t6"); - if (entry != caller_registers.end()) { - frame->context_validity |= StackFrameRISCV64::CONTEXT_VALID_T6; - frame->context.t6 = entry->second; - } - - // If we didn't recover the PC and the SP, then the frame isn't very useful. - static const uint64_t essentials = (StackFrameRISCV64::CONTEXT_VALID_SP - | StackFrameRISCV64::CONTEXT_VALID_PC); - if ((frame->context_validity & essentials) != essentials) - return NULL; - - frame->trust = StackFrame::FRAME_TRUST_CFI; - return frame.release(); -} - -StackFrameRISCV64* StackwalkerRISCV64::GetCallerByStackScan( - const vector<StackFrame*>& frames) { - StackFrameRISCV64* last_frame = - static_cast<StackFrameRISCV64*>(frames.back()); - uint64_t last_sp = last_frame->context.sp; - uint64_t caller_sp, caller_pc; - - if (!ScanForReturnAddress(last_sp, &caller_sp, &caller_pc, - 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. - StackFrameRISCV64* frame = new StackFrameRISCV64(); - - frame->trust = StackFrame::FRAME_TRUST_SCAN; - frame->context = last_frame->context; - frame->context.pc = caller_pc; - frame->context.sp = caller_sp; - frame->context_validity = StackFrameRISCV64::CONTEXT_VALID_PC | - StackFrameRISCV64::CONTEXT_VALID_SP; - - return frame; -} - -StackFrameRISCV64* StackwalkerRISCV64::GetCallerByFramePointer( - const vector<StackFrame*>& frames) { - StackFrameRISCV64* last_frame = - static_cast<StackFrameRISCV64*>(frames.back()); - - uint64_t last_fp = last_frame->context.s0; - - 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_ra = 0; - if (last_fp && !memory_->GetMemoryAtAddress(last_fp + 8, &caller_ra)) { - BPLOG(ERROR) << "Unable to read caller_ra from last_fp + 8: 0x" - << std::hex << (last_fp + 8); - return NULL; - } - - uint64_t caller_sp = last_fp ? last_fp + 16 : last_frame->context.s0; - - // Create a new stack frame (ownership will be transferred to the caller) - // and fill it in. - StackFrameRISCV64* frame = new StackFrameRISCV64(); - - frame->trust = StackFrame::FRAME_TRUST_FP; - frame->context = last_frame->context; - frame->context.s0 = caller_fp; - frame->context.sp = caller_sp; - frame->context.pc = last_frame->context.ra; - frame->context.ra = caller_ra; - frame->context_validity = StackFrameRISCV64::CONTEXT_VALID_PC | - StackFrameRISCV64::CONTEXT_VALID_RA | - StackFrameRISCV64::CONTEXT_VALID_S0 | - StackFrameRISCV64::CONTEXT_VALID_SP; - return frame; -} - -StackFrame* StackwalkerRISCV64::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(); - StackFrameRISCV64* last_frame = - static_cast<StackFrameRISCV64*>(frames.back()); - scoped_ptr<StackFrameRISCV64> frame; - - // Try to recover caller information from CFI. - 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.pc, frame->context.sp, - last_frame->context.sp, - 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. - // RISCV 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.pc. - frame->instruction = frame->context.pc - 4; - - return frame.release(); -} - -} // namespace google_breakpad |