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authorDawid Potocki <dawid@dawidpotocki.com>2024-03-05 14:09:27 +1300
committerDawid Potocki <dawid@dawidpotocki.com>2024-03-05 20:34:15 +1300
commit063e15900bda8453fb0fc6751e78d064501ccbae (patch)
treea4cd5f01dbca33a262333aff10e1e035217a30c8 /externals/breakpad/src/processor/stackwalker_riscv.cc
parent537296095ab24eddcb196b5ef98004f91de9c8c2 (diff)
Replace broken submodules with vendored source codeHEADpatched
Diffstat (limited to 'externals/breakpad/src/processor/stackwalker_riscv.cc')
-rw-r--r--externals/breakpad/src/processor/stackwalker_riscv.cc539
1 files changed, 539 insertions, 0 deletions
diff --git a/externals/breakpad/src/processor/stackwalker_riscv.cc b/externals/breakpad/src/processor/stackwalker_riscv.cc
new file mode 100644
index 0000000000..c3681a617e
--- /dev/null
+++ b/externals/breakpad/src/processor/stackwalker_riscv.cc
@@ -0,0 +1,539 @@
+// 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_riscv.cc: riscv-specific stackwalker.
+ *
+ * See stackwalker_riscv.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_riscv.h"
+
+namespace google_breakpad {
+
+StackwalkerRISCV::StackwalkerRISCV(const SystemInfo* system_info,
+ const MDRawContextRISCV* 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* StackwalkerRISCV::GetContextFrame() {
+ if (!context_) {
+ BPLOG(ERROR) << "Can't get context frame without context";
+ return NULL;
+ }
+
+ StackFrameRISCV* frame = new StackFrameRISCV();
+
+ frame->context = *context_;
+ frame->context_validity = context_frame_validity_;
+ frame->trust = StackFrame::FRAME_TRUST_CONTEXT;
+ frame->instruction = frame->context.pc;
+
+ return frame;
+}
+
+StackFrameRISCV* StackwalkerRISCV::GetCallerByCFIFrameInfo(
+ const vector<StackFrame*>& frames,
+ CFIFrameInfo* cfi_frame_info) {
+ StackFrameRISCV* last_frame =
+ static_cast<StackFrameRISCV*>(frames.back());
+
+ // Populate a dictionary with the valid register values in last_frame.
+ CFIFrameInfo::RegisterValueMap<uint32_t> callee_registers;
+ if (last_frame->context_validity & StackFrameRISCV::CONTEXT_VALID_PC)
+ callee_registers["pc"] = last_frame->context.pc;
+ if (last_frame->context_validity & StackFrameRISCV::CONTEXT_VALID_RA)
+ callee_registers["ra"] = last_frame->context.ra;
+ if (last_frame->context_validity & StackFrameRISCV::CONTEXT_VALID_SP)
+ callee_registers["sp"] = last_frame->context.sp;
+ if (last_frame->context_validity & StackFrameRISCV::CONTEXT_VALID_GP)
+ callee_registers["gp"] = last_frame->context.gp;
+ if (last_frame->context_validity & StackFrameRISCV::CONTEXT_VALID_TP)
+ callee_registers["tp"] = last_frame->context.tp;
+ if (last_frame->context_validity & StackFrameRISCV::CONTEXT_VALID_T0)
+ callee_registers["t0"] = last_frame->context.t0;
+ if (last_frame->context_validity & StackFrameRISCV::CONTEXT_VALID_T1)
+ callee_registers["t1"] = last_frame->context.t1;
+ if (last_frame->context_validity & StackFrameRISCV::CONTEXT_VALID_T2)
+ callee_registers["t2"] = last_frame->context.t2;
+ if (last_frame->context_validity & StackFrameRISCV::CONTEXT_VALID_S0)
+ callee_registers["s0"] = last_frame->context.s0;
+ if (last_frame->context_validity & StackFrameRISCV::CONTEXT_VALID_S1)
+ callee_registers["s1"] = last_frame->context.s1;
+ if (last_frame->context_validity & StackFrameRISCV::CONTEXT_VALID_A0)
+ callee_registers["a0"] = last_frame->context.a0;
+ if (last_frame->context_validity & StackFrameRISCV::CONTEXT_VALID_A1)
+ callee_registers["a1"] = last_frame->context.a1;
+ if (last_frame->context_validity & StackFrameRISCV::CONTEXT_VALID_A2)
+ callee_registers["a2"] = last_frame->context.a2;
+ if (last_frame->context_validity & StackFrameRISCV::CONTEXT_VALID_A3)
+ callee_registers["a3"] = last_frame->context.a3;
+ if (last_frame->context_validity & StackFrameRISCV::CONTEXT_VALID_A4)
+ callee_registers["a4"] = last_frame->context.a4;
+ if (last_frame->context_validity & StackFrameRISCV::CONTEXT_VALID_A5)
+ callee_registers["a5"] = last_frame->context.a5;
+ if (last_frame->context_validity & StackFrameRISCV::CONTEXT_VALID_A6)
+ callee_registers["a6"] = last_frame->context.a6;
+ if (last_frame->context_validity & StackFrameRISCV::CONTEXT_VALID_A7)
+ callee_registers["a7"] = last_frame->context.a7;
+ if (last_frame->context_validity & StackFrameRISCV::CONTEXT_VALID_S2)
+ callee_registers["s2"] = last_frame->context.s2;
+ if (last_frame->context_validity & StackFrameRISCV::CONTEXT_VALID_S3)
+ callee_registers["s3"] = last_frame->context.s3;
+ if (last_frame->context_validity & StackFrameRISCV::CONTEXT_VALID_S4)
+ callee_registers["s4"] = last_frame->context.s4;
+ if (last_frame->context_validity & StackFrameRISCV::CONTEXT_VALID_S5)
+ callee_registers["s5"] = last_frame->context.s5;
+ if (last_frame->context_validity & StackFrameRISCV::CONTEXT_VALID_S6)
+ callee_registers["s6"] = last_frame->context.s6;
+ if (last_frame->context_validity & StackFrameRISCV::CONTEXT_VALID_S7)
+ callee_registers["s7"] = last_frame->context.s7;
+ if (last_frame->context_validity & StackFrameRISCV::CONTEXT_VALID_S8)
+ callee_registers["s8"] = last_frame->context.s8;
+ if (last_frame->context_validity & StackFrameRISCV::CONTEXT_VALID_S9)
+ callee_registers["s9"] = last_frame->context.s9;
+ if (last_frame->context_validity & StackFrameRISCV::CONTEXT_VALID_S10)
+ callee_registers["s10"] = last_frame->context.s10;
+ if (last_frame->context_validity & StackFrameRISCV::CONTEXT_VALID_S11)
+ callee_registers["s11"] = last_frame->context.s11;
+ if (last_frame->context_validity & StackFrameRISCV::CONTEXT_VALID_T3)
+ callee_registers["t3"] = last_frame->context.t3;
+ if (last_frame->context_validity & StackFrameRISCV::CONTEXT_VALID_T4)
+ callee_registers["t4"] = last_frame->context.t4;
+ if (last_frame->context_validity & StackFrameRISCV::CONTEXT_VALID_T5)
+ callee_registers["t5"] = last_frame->context.t5;
+ if (last_frame->context_validity & StackFrameRISCV::CONTEXT_VALID_T6)
+ callee_registers["t6"] = last_frame->context.t6;
+
+ // 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.
+ CFIFrameInfo::RegisterValueMap<uint32_t>::iterator entry;
+ scoped_ptr<StackFrameRISCV> frame(new StackFrameRISCV());
+ entry = caller_registers.find("pc");
+ if (entry != caller_registers.end()) {
+ frame->context_validity |= StackFrameRISCV::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 |= StackFrameRISCV::CONTEXT_VALID_PC;
+ frame->context.pc = entry->second;
+ }
+ }
+ entry = caller_registers.find("ra");
+ if (entry != caller_registers.end()) {
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_RA;
+ frame->context.ra = entry->second;
+ }
+ entry = caller_registers.find("sp");
+ if (entry != caller_registers.end()) {
+ frame->context_validity |= StackFrameRISCV::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 |= StackFrameRISCV::CONTEXT_VALID_SP;
+ frame->context.sp = entry->second;
+ }
+ }
+ entry = caller_registers.find("gp");
+ if (entry != caller_registers.end()) {
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_GP;
+ frame->context.gp = entry->second;
+ }
+ entry = caller_registers.find("tp");
+ if (entry != caller_registers.end()) {
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_TP;
+ frame->context.tp = entry->second;
+ }
+ entry = caller_registers.find("t0");
+ if (entry != caller_registers.end()) {
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_T0;
+ frame->context.t0 = entry->second;
+ }
+ entry = caller_registers.find("t1");
+ if (entry != caller_registers.end()) {
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_T1;
+ frame->context.t1 = entry->second;
+ }
+ entry = caller_registers.find("t2");
+ if (entry != caller_registers.end()) {
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_T2;
+ frame->context.t2 = entry->second;
+ }
+ entry = caller_registers.find("s0");
+ if (entry != caller_registers.end()) {
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_S0;
+ frame->context.s0 = entry->second;
+ } else if (last_frame->context_validity &
+ StackFrameRISCV::CONTEXT_VALID_S0) {
+ // Since the register is callee-saves, assume the callee
+ // has not yet changed it.
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_S0;
+ frame->context.s0 = last_frame->context.s0;
+ }
+ entry = caller_registers.find("s1");
+ if (entry != caller_registers.end()) {
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_S1;
+ frame->context.s1 = entry->second;
+ } else if (last_frame->context_validity &
+ StackFrameRISCV::CONTEXT_VALID_S1) {
+ // Since the register is callee-saves, assume the callee
+ // has not yet changed it.
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_S1;
+ frame->context.s1 = last_frame->context.s1;
+ }
+ entry = caller_registers.find("a0");
+ if (entry != caller_registers.end()) {
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_A0;
+ frame->context.a0 = entry->second;
+ }
+ entry = caller_registers.find("a1");
+ if (entry != caller_registers.end()) {
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_A1;
+ frame->context.a1 = entry->second;
+ }
+ entry = caller_registers.find("a2");
+ if (entry != caller_registers.end()) {
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_A2;
+ frame->context.a2 = entry->second;
+ }
+ entry = caller_registers.find("a3");
+ if (entry != caller_registers.end()) {
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_A3;
+ frame->context.a3 = entry->second;
+ }
+ entry = caller_registers.find("a4");
+ if (entry != caller_registers.end()) {
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_A4;
+ frame->context.a4 = entry->second;
+ }
+ entry = caller_registers.find("a5");
+ if (entry != caller_registers.end()) {
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_A5;
+ frame->context.a5 = entry->second;
+ }
+ entry = caller_registers.find("a6");
+ if (entry != caller_registers.end()) {
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_A6;
+ frame->context.a6 = entry->second;
+ }
+ entry = caller_registers.find("a7");
+ if (entry != caller_registers.end()) {
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_A7;
+ frame->context.a7 = entry->second;
+ }
+ entry = caller_registers.find("s2");
+ if (entry != caller_registers.end()) {
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_S2;
+ frame->context.s2 = entry->second;
+ } else if (last_frame->context_validity &
+ StackFrameRISCV::CONTEXT_VALID_S2) {
+ // Since the register is callee-saves, assume the callee
+ // has not yet changed it.
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_S2;
+ frame->context.s2 = last_frame->context.s2;
+ }
+ entry = caller_registers.find("s3");
+ if (entry != caller_registers.end()) {
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_S3;
+ frame->context.s3 = entry->second;
+ } else if (last_frame->context_validity &
+ StackFrameRISCV::CONTEXT_VALID_S3) {
+ // Since the register is callee-saves, assume the callee
+ // has not yet changed it.
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_S3;
+ frame->context.s3 = last_frame->context.s3;
+ }
+ entry = caller_registers.find("s4");
+ if (entry != caller_registers.end()) {
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_S4;
+ frame->context.s4 = entry->second;
+ } else if (last_frame->context_validity &
+ StackFrameRISCV::CONTEXT_VALID_S4) {
+ // Since the register is callee-saves, assume the callee
+ // has not yet changed it.
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_S4;
+ frame->context.s4 = last_frame->context.s4;
+ }
+ entry = caller_registers.find("s5");
+ if (entry != caller_registers.end()) {
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_S5;
+ frame->context.s5 = entry->second;
+ } else if (last_frame->context_validity &
+ StackFrameRISCV::CONTEXT_VALID_S5) {
+ // Since the register is callee-saves, assume the callee
+ // has not yet changed it.
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_S5;
+ frame->context.s5 = last_frame->context.s5;
+ }
+ entry = caller_registers.find("s6");
+ if (entry != caller_registers.end()) {
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_S6;
+ frame->context.s6 = entry->second;
+ } else if (last_frame->context_validity &
+ StackFrameRISCV::CONTEXT_VALID_S6) {
+ // Since the register is callee-saves, assume the callee
+ // has not yet changed it.
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_S6;
+ frame->context.s6 = last_frame->context.s6;
+ }
+ entry = caller_registers.find("s7");
+ if (entry != caller_registers.end()) {
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_S7;
+ frame->context.s7 = entry->second;
+ } else if (last_frame->context_validity &
+ StackFrameRISCV::CONTEXT_VALID_S7) {
+ // Since the register is callee-saves, assume the callee
+ // has not yet changed it.
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_S7;
+ frame->context.s7 = last_frame->context.s7;
+ }
+ entry = caller_registers.find("s8");
+ if (entry != caller_registers.end()) {
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_S8;
+ frame->context.s8 = entry->second;
+ } else if (last_frame->context_validity &
+ StackFrameRISCV::CONTEXT_VALID_S8) {
+ // Since the register is callee-saves, assume the callee
+ // has not yet changed it.
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_S8;
+ frame->context.s8 = last_frame->context.s8;
+ }
+ entry = caller_registers.find("s9");
+ if (entry != caller_registers.end()) {
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_S9;
+ frame->context.s9 = entry->second;
+ } else if (last_frame->context_validity &
+ StackFrameRISCV::CONTEXT_VALID_S9) {
+ // Since the register is callee-saves, assume the callee
+ // has not yet changed it.
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_S9;
+ frame->context.s9 = last_frame->context.s9;
+ }
+ entry = caller_registers.find("s10");
+ if (entry != caller_registers.end()) {
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_S10;
+ frame->context.s10 = entry->second;
+ } else if (last_frame->context_validity &
+ StackFrameRISCV::CONTEXT_VALID_S10) {
+ // Since the register is callee-saves, assume the callee
+ // has not yet changed it.
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_S10;
+ frame->context.s10 = last_frame->context.s10;
+ }
+ entry = caller_registers.find("s11");
+ if (entry != caller_registers.end()) {
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_S11;
+ frame->context.s11 = entry->second;
+ } else if (last_frame->context_validity &
+ StackFrameRISCV::CONTEXT_VALID_S11) {
+ // Since the register is callee-saves, assume the callee
+ // has not yet changed it.
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_S11;
+ frame->context.s11 = last_frame->context.s11;
+ }
+ entry = caller_registers.find("t3");
+ if (entry != caller_registers.end()) {
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_T3;
+ frame->context.t3 = entry->second;
+ }
+ entry = caller_registers.find("t4");
+ if (entry != caller_registers.end()) {
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_T4;
+ frame->context.t4 = entry->second;
+ }
+ entry = caller_registers.find("t5");
+ if (entry != caller_registers.end()) {
+ frame->context_validity |= StackFrameRISCV::CONTEXT_VALID_T5;
+ frame->context.t5 = entry->second;
+ }
+ entry = caller_registers.find("t6");
+ if (entry != caller_registers.end()) {
+ frame->context_validity |= StackFrameRISCV::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 = (StackFrameRISCV::CONTEXT_VALID_SP
+ | StackFrameRISCV::CONTEXT_VALID_PC);
+ if ((frame->context_validity & essentials) != essentials)
+ return NULL;
+
+ frame->trust = StackFrame::FRAME_TRUST_CFI;
+ return frame.release();
+}
+
+StackFrameRISCV* StackwalkerRISCV::GetCallerByStackScan(
+ const vector<StackFrame*>& frames) {
+ StackFrameRISCV* last_frame =
+ static_cast<StackFrameRISCV*>(frames.back());
+ uint32_t last_sp = last_frame->context.sp;
+ uint32_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 += 4;
+
+ // Create a new stack frame (ownership will be transferred to the caller)
+ // and fill it in.
+ StackFrameRISCV* frame = new StackFrameRISCV();
+
+ frame->trust = StackFrame::FRAME_TRUST_SCAN;
+ frame->context = last_frame->context;
+ frame->context.pc = caller_pc;
+ frame->context.sp = caller_sp;
+ frame->context_validity = StackFrameRISCV::CONTEXT_VALID_PC |
+ StackFrameRISCV::CONTEXT_VALID_SP;
+
+ return frame;
+}
+
+ StackFrameRISCV* StackwalkerRISCV::GetCallerByFramePointer(
+ const vector<StackFrame*>& frames) {
+ StackFrameRISCV* last_frame =
+ static_cast<StackFrameRISCV*>(frames.back());
+
+ uint32_t last_fp = last_frame->context.s0;
+
+ 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_ra = 0;
+ if (last_fp && !memory_->GetMemoryAtAddress(last_fp + 4, &caller_ra)) {
+ BPLOG(ERROR) << "Unable to read caller_ra from last_fp + 4: 0x"
+ << std::hex << (last_fp + 4);
+ return NULL;
+ }
+
+ uint32_t caller_sp = last_fp ? last_fp + 8 : last_frame->context.s0;
+
+ // Create a new stack frame (ownership will be transferred to the caller)
+ // and fill it in.
+ StackFrameRISCV* frame = new StackFrameRISCV();
+
+ 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 = StackFrameRISCV::CONTEXT_VALID_PC |
+ StackFrameRISCV::CONTEXT_VALID_RA |
+ StackFrameRISCV::CONTEXT_VALID_S0 |
+ StackFrameRISCV::CONTEXT_VALID_SP;
+ return frame;
+}
+
+StackFrame* StackwalkerRISCV::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();
+ StackFrameRISCV* last_frame =
+ static_cast<StackFrameRISCV*>(frames.back());
+ scoped_ptr<StackFrameRISCV> 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
generated by cgit v1.2.3-70-g09d2 (git 2.49.0) at 2025-04-11 02:01:04 +0000