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breakpad_update
tomahawk/thirdparty/breakpad/processor/stackwalker_arm64_unittest.cc
Dominik Schmidt b4f05b0831 Update breakpad to make it work with MinGW
2014-04-14 19:23:44 +02:00

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// Copyright (c) 2010, 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
// 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 Inc. 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.
// Original author: Jim Blandy <jimb@mozilla.com> <jimb@red-bean.com>
// stackwalker_arm64_unittest.cc: Unit tests for StackwalkerARM64 class.
#include <string.h>
#include <string>
#include <vector>
#include "breakpad_googletest_includes.h"
#include "common/test_assembler.h"
#include "common/using_std_string.h"
#include "google_breakpad/common/minidump_format.h"
#include "google_breakpad/processor/basic_source_line_resolver.h"
#include "google_breakpad/processor/call_stack.h"
#include "google_breakpad/processor/code_module.h"
#include "google_breakpad/processor/source_line_resolver_interface.h"
#include "google_breakpad/processor/stack_frame_cpu.h"
#include "processor/stackwalker_unittest_utils.h"
#include "processor/stackwalker_arm64.h"
#include "processor/windows_frame_info.h"
using google_breakpad::BasicSourceLineResolver;
using google_breakpad::CallStack;
using google_breakpad::CodeModule;
using google_breakpad::StackFrameSymbolizer;
using google_breakpad::StackFrame;
using google_breakpad::StackFrameARM64;
using google_breakpad::Stackwalker;
using google_breakpad::StackwalkerARM64;
using google_breakpad::SystemInfo;
using google_breakpad::WindowsFrameInfo;
using google_breakpad::test_assembler::kLittleEndian;
using google_breakpad::test_assembler::Label;
using google_breakpad::test_assembler::Section;
using std::vector;
using testing::_;
using testing::AnyNumber;
using testing::Return;
using testing::SetArgumentPointee;
using testing::Test;
class StackwalkerARM64Fixture {
public:
StackwalkerARM64Fixture()
: stack_section(kLittleEndian),
// Give the two modules reasonable standard locations and names
// for tests to play with.
module1(0x40000000, 0x10000, "module1", "version1"),
module2(0x50000000, 0x10000, "module2", "version2") {
// Identify the system as an iOS system, since that is the only platform
// for which ARM64 support is currently enabled.
system_info.os = "iOS";
system_info.os_short = "ios";
system_info.cpu = "arm64";
system_info.cpu_info = "";
// Put distinctive values in the raw CPU context.
BrandContext(&raw_context);
// Create some modules with some stock debugging information.
modules.Add(&module1);
modules.Add(&module2);
// By default, none of the modules have symbol info; call
// SetModuleSymbols to override this.
EXPECT_CALL(supplier, GetCStringSymbolData(_, _, _, _, _))
.WillRepeatedly(Return(MockSymbolSupplier::NOT_FOUND));
// Avoid GMOCK WARNING "Uninteresting mock function call - returning
// directly" for FreeSymbolData().
EXPECT_CALL(supplier, FreeSymbolData(_)).Times(AnyNumber());
// Reset max_frames_scanned since it's static.
Stackwalker::set_max_frames_scanned(1024);
}
// Set the Breakpad symbol information that supplier should return for
// MODULE to INFO.
void SetModuleSymbols(MockCodeModule *module, const string &info) {
size_t buffer_size;
char *buffer = supplier.CopySymbolDataAndOwnTheCopy(info, &buffer_size);
EXPECT_CALL(supplier, GetCStringSymbolData(module, &system_info, _, _, _))
.WillRepeatedly(DoAll(SetArgumentPointee<3>(buffer),
SetArgumentPointee<4>(buffer_size),
Return(MockSymbolSupplier::FOUND)));
}
// Populate stack_region with the contents of stack_section. Use
// stack_section.start() as the region's starting address.
void RegionFromSection() {
string contents;
ASSERT_TRUE(stack_section.GetContents(&contents));
stack_region.Init(stack_section.start().Value(), contents);
}
// Fill RAW_CONTEXT with pseudo-random data, for round-trip checking.
void BrandContext(MDRawContextARM64 *raw_context) {
uint8_t x = 173;
for (size_t i = 0; i < sizeof(*raw_context); i++)
reinterpret_cast<uint8_t *>(raw_context)[i] = (x += 17);
}
SystemInfo system_info;
MDRawContextARM64 raw_context;
Section stack_section;
MockMemoryRegion stack_region;
MockCodeModule module1;
MockCodeModule module2;
MockCodeModules modules;
MockSymbolSupplier supplier;
BasicSourceLineResolver resolver;
CallStack call_stack;
const vector<StackFrame *> *frames;
};
class SanityCheck: public StackwalkerARM64Fixture, public Test { };
TEST_F(SanityCheck, NoResolver) {
// Since the context's frame pointer is garbage, the stack walk will end after
// the first frame.
StackFrameSymbolizer frame_symbolizer(NULL, NULL);
StackwalkerARM64 walker(&system_info, &raw_context, &stack_region, &modules,
&frame_symbolizer);
// This should succeed even without a resolver or supplier.
vector<const CodeModule*> modules_without_symbols;
vector<const CodeModule*> modules_with_corrupt_symbols;
ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols,
&modules_with_corrupt_symbols));
ASSERT_EQ(0U, modules_without_symbols.size());
ASSERT_EQ(0U, modules_with_corrupt_symbols.size());
frames = call_stack.frames();
ASSERT_EQ(1U, frames->size());
StackFrameARM64 *frame = static_cast<StackFrameARM64 *>(frames->at(0));
// Check that the values from the original raw context made it
// through to the context in the stack frame.
EXPECT_EQ(0, memcmp(&raw_context, &frame->context, sizeof(raw_context)));
}
class GetContextFrame: public StackwalkerARM64Fixture, public Test { };
// The stackwalker should be able to produce the context frame even
// without stack memory present.
TEST_F(GetContextFrame, NoStackMemory) {
StackFrameSymbolizer frame_symbolizer(&supplier, &resolver);
StackwalkerARM64 walker(&system_info, &raw_context, NULL, &modules,
&frame_symbolizer);
vector<const CodeModule*> modules_without_symbols;
vector<const CodeModule*> modules_with_corrupt_symbols;
ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols,
&modules_with_corrupt_symbols));
ASSERT_EQ(0U, modules_without_symbols.size());
ASSERT_EQ(0U, modules_with_corrupt_symbols.size());
frames = call_stack.frames();
ASSERT_EQ(1U, frames->size());
StackFrameARM64 *frame = static_cast<StackFrameARM64 *>(frames->at(0));
// Check that the values from the original raw context made it
// through to the context in the stack frame.
EXPECT_EQ(0, memcmp(&raw_context, &frame->context, sizeof(raw_context)));
}
class GetCallerFrame: public StackwalkerARM64Fixture, public Test { };
TEST_F(GetCallerFrame, ScanWithoutSymbols) {
// When the stack walker resorts to scanning the stack,
// only addresses located within loaded modules are
// considered valid return addresses.
// Force scanning through three frames to ensure that the
// stack pointer is set properly in scan-recovered frames.
stack_section.start() = 0x80000000;
uint64_t return_address1 = 0x50000100;
uint64_t return_address2 = 0x50000900;
Label frame1_sp, frame2_sp;
stack_section
// frame 0
.Append(16, 0) // space
.D64(0x40090000) // junk that's not
.D64(0x60000000) // a return address
.D64(return_address1) // actual return address
// frame 1
.Mark(&frame1_sp)
.Append(16, 0) // space
.D64(0xF0000000) // more junk
.D64(0x0000000D)
.D64(return_address2) // actual return address
// frame 2
.Mark(&frame2_sp)
.Append(64, 0); // end of stack
RegionFromSection();
raw_context.iregs[MD_CONTEXT_ARM64_REG_PC] = 0x40005510;
raw_context.iregs[MD_CONTEXT_ARM64_REG_SP] = stack_section.start().Value();
StackFrameSymbolizer frame_symbolizer(&supplier, &resolver);
StackwalkerARM64 walker(&system_info, &raw_context, &stack_region, &modules,
&frame_symbolizer);
vector<const CodeModule*> modules_without_symbols;
vector<const CodeModule*> modules_with_corrupt_symbols;
ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols,
&modules_with_corrupt_symbols));
ASSERT_EQ(2U, modules_without_symbols.size());
ASSERT_EQ("module1", modules_without_symbols[0]->debug_file());
ASSERT_EQ("module2", modules_without_symbols[1]->debug_file());
ASSERT_EQ(0U, modules_with_corrupt_symbols.size());
frames = call_stack.frames();
ASSERT_EQ(3U, frames->size());
StackFrameARM64 *frame0 = static_cast<StackFrameARM64 *>(frames->at(0));
EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust);
ASSERT_EQ(StackFrameARM64::CONTEXT_VALID_ALL,
frame0->context_validity);
EXPECT_EQ(0, memcmp(&raw_context, &frame0->context, sizeof(raw_context)));
StackFrameARM64 *frame1 = static_cast<StackFrameARM64 *>(frames->at(1));
EXPECT_EQ(StackFrame::FRAME_TRUST_SCAN, frame1->trust);
ASSERT_EQ((StackFrameARM64::CONTEXT_VALID_PC |
StackFrameARM64::CONTEXT_VALID_SP),
frame1->context_validity);
EXPECT_EQ(return_address1, frame1->context.iregs[MD_CONTEXT_ARM64_REG_PC]);
EXPECT_EQ(frame1_sp.Value(), frame1->context.iregs[MD_CONTEXT_ARM64_REG_SP]);
StackFrameARM64 *frame2 = static_cast<StackFrameARM64 *>(frames->at(2));
EXPECT_EQ(StackFrame::FRAME_TRUST_SCAN, frame2->trust);
ASSERT_EQ((StackFrameARM64::CONTEXT_VALID_PC |
StackFrameARM64::CONTEXT_VALID_SP),
frame2->context_validity);
EXPECT_EQ(return_address2, frame2->context.iregs[MD_CONTEXT_ARM64_REG_PC]);
EXPECT_EQ(frame2_sp.Value(), frame2->context.iregs[MD_CONTEXT_ARM64_REG_SP]);
}
TEST_F(GetCallerFrame, ScanWithFunctionSymbols) {
// During stack scanning, if a potential return address
// is located within a loaded module that has symbols,
// it is only considered a valid return address if it
// lies within a function's bounds.
stack_section.start() = 0x80000000;
uint64_t return_address = 0x50000200;
Label frame1_sp;
stack_section
// frame 0
.Append(16, 0) // space
.D64(0x40090000) // junk that's not
.D64(0x60000000) // a return address
.D64(0x40001000) // a couple of plausible addresses
.D64(0x5000F000) // that are not within functions
.D64(return_address) // actual return address
// frame 1
.Mark(&frame1_sp)
.Append(64, 0); // end of stack
RegionFromSection();
raw_context.iregs[MD_CONTEXT_ARM64_REG_PC] = 0x40000200;
raw_context.iregs[MD_CONTEXT_ARM64_REG_SP] = stack_section.start().Value();
SetModuleSymbols(&module1,
// The youngest frame's function.
"FUNC 100 400 10 monotreme\n");
SetModuleSymbols(&module2,
// The calling frame's function.
"FUNC 100 400 10 marsupial\n");
StackFrameSymbolizer frame_symbolizer(&supplier, &resolver);
StackwalkerARM64 walker(&system_info, &raw_context, &stack_region, &modules,
&frame_symbolizer);
vector<const CodeModule*> modules_without_symbols;
vector<const CodeModule*> modules_with_corrupt_symbols;
ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols,
&modules_with_corrupt_symbols));
ASSERT_EQ(0U, modules_without_symbols.size());
ASSERT_EQ(0U, modules_with_corrupt_symbols.size());
frames = call_stack.frames();
ASSERT_EQ(2U, frames->size());
StackFrameARM64 *frame0 = static_cast<StackFrameARM64 *>(frames->at(0));
EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust);
ASSERT_EQ(StackFrameARM64::CONTEXT_VALID_ALL,
frame0->context_validity);
EXPECT_EQ(0, memcmp(&raw_context, &frame0->context, sizeof(raw_context)));
EXPECT_EQ("monotreme", frame0->function_name);
EXPECT_EQ(0x40000100ULL, frame0->function_base);
StackFrameARM64 *frame1 = static_cast<StackFrameARM64 *>(frames->at(1));
EXPECT_EQ(StackFrame::FRAME_TRUST_SCAN, frame1->trust);
ASSERT_EQ((StackFrameARM64::CONTEXT_VALID_PC |
StackFrameARM64::CONTEXT_VALID_SP),
frame1->context_validity);
EXPECT_EQ(return_address, frame1->context.iregs[MD_CONTEXT_ARM64_REG_PC]);
EXPECT_EQ(frame1_sp.Value(), frame1->context.iregs[MD_CONTEXT_ARM64_REG_SP]);
EXPECT_EQ("marsupial", frame1->function_name);
EXPECT_EQ(0x50000100ULL, frame1->function_base);
}
TEST_F(GetCallerFrame, ScanFirstFrame) {
// If the stackwalker resorts to stack scanning, it will scan much
// farther to find the caller of the context frame.
stack_section.start() = 0x80000000;
uint64_t return_address1 = 0x50000100;
uint64_t return_address2 = 0x50000900;
Label frame1_sp, frame2_sp;
stack_section
// frame 0
.Append(32, 0) // space
.D64(0x40090000) // junk that's not
.D64(0x60000000) // a return address
.Append(96, 0) // more space
.D64(return_address1) // actual return address
// frame 1
.Mark(&frame1_sp)
.Append(32, 0) // space
.D64(0xF0000000) // more junk
.D64(0x0000000D)
.Append(256, 0) // more space
.D64(return_address2) // actual return address
// (won't be found)
// frame 2
.Mark(&frame2_sp)
.Append(64, 0); // end of stack
RegionFromSection();
raw_context.iregs[MD_CONTEXT_ARM64_REG_PC] = 0x40005510;
raw_context.iregs[MD_CONTEXT_ARM64_REG_SP] = stack_section.start().Value();
StackFrameSymbolizer frame_symbolizer(&supplier, &resolver);
StackwalkerARM64 walker(&system_info, &raw_context, &stack_region, &modules,
&frame_symbolizer);
vector<const CodeModule*> modules_without_symbols;
vector<const CodeModule*> modules_with_corrupt_symbols;
ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols,
&modules_with_corrupt_symbols));
ASSERT_EQ(2U, modules_without_symbols.size());
ASSERT_EQ("module1", modules_without_symbols[0]->debug_file());
ASSERT_EQ("module2", modules_without_symbols[1]->debug_file());
ASSERT_EQ(0U, modules_with_corrupt_symbols.size());
frames = call_stack.frames();
ASSERT_EQ(2U, frames->size());
StackFrameARM64 *frame0 = static_cast<StackFrameARM64 *>(frames->at(0));
EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust);
ASSERT_EQ(StackFrameARM64::CONTEXT_VALID_ALL,
frame0->context_validity);
EXPECT_EQ(0, memcmp(&raw_context, &frame0->context, sizeof(raw_context)));
StackFrameARM64 *frame1 = static_cast<StackFrameARM64 *>(frames->at(1));
EXPECT_EQ(StackFrame::FRAME_TRUST_SCAN, frame1->trust);
ASSERT_EQ((StackFrameARM64::CONTEXT_VALID_PC |
StackFrameARM64::CONTEXT_VALID_SP),
frame1->context_validity);
EXPECT_EQ(return_address1, frame1->context.iregs[MD_CONTEXT_ARM64_REG_PC]);
EXPECT_EQ(frame1_sp.Value(), frame1->context.iregs[MD_CONTEXT_ARM64_REG_SP]);
}
// Test that set_max_frames_scanned prevents using stack scanning
// to find caller frames.
TEST_F(GetCallerFrame, ScanningNotAllowed) {
// When the stack walker resorts to scanning the stack,
// only addresses located within loaded modules are
// considered valid return addresses.
stack_section.start() = 0x80000000;
uint64_t return_address1 = 0x50000100;
uint64_t return_address2 = 0x50000900;
Label frame1_sp, frame2_sp;
stack_section
// frame 0
.Append(16, 0) // space
.D64(0x40090000) // junk that's not
.D64(0x60000000) // a return address
.D64(return_address1) // actual return address
// frame 1
.Mark(&frame1_sp)
.Append(16, 0) // space
.D64(0xF0000000) // more junk
.D64(0x0000000D)
.D64(return_address2) // actual return address
// frame 2
.Mark(&frame2_sp)
.Append(64, 0); // end of stack
RegionFromSection();
raw_context.iregs[MD_CONTEXT_ARM64_REG_PC] = 0x40005510;
raw_context.iregs[MD_CONTEXT_ARM64_REG_SP] = stack_section.start().Value();
StackFrameSymbolizer frame_symbolizer(&supplier, &resolver);
StackwalkerARM64 walker(&system_info, &raw_context, &stack_region, &modules,
&frame_symbolizer);
Stackwalker::set_max_frames_scanned(0);
vector<const CodeModule*> modules_without_symbols;
vector<const CodeModule*> modules_with_corrupt_symbols;
ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols,
&modules_with_corrupt_symbols));
ASSERT_EQ(1U, modules_without_symbols.size());
ASSERT_EQ("module1", modules_without_symbols[0]->debug_file());
ASSERT_EQ(0U, modules_with_corrupt_symbols.size());
frames = call_stack.frames();
ASSERT_EQ(1U, frames->size());
StackFrameARM64 *frame0 = static_cast<StackFrameARM64 *>(frames->at(0));
EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust);
ASSERT_EQ(StackFrameARM64::CONTEXT_VALID_ALL,
frame0->context_validity);
EXPECT_EQ(0, memcmp(&raw_context, &frame0->context, sizeof(raw_context)));
}
class GetFramesByFramePointer: public StackwalkerARM64Fixture, public Test { };
TEST_F(GetFramesByFramePointer, OnlyFramePointer) {
stack_section.start() = 0x80000000;
uint64_t return_address1 = 0x50000100;
uint64_t return_address2 = 0x50000900;
Label frame1_sp, frame2_sp;
Label frame1_fp, frame2_fp;
stack_section
// frame 0
.Append(64, 0) // Whatever values on the stack.
.D64(0x0000000D) // junk that's not
.D64(0xF0000000) // a return address.
.Mark(&frame1_fp) // Next fp will point to the next value.
.D64(frame2_fp) // Save current frame pointer.
.D64(return_address2) // Save current link register.
.Mark(&frame1_sp)
// frame 1
.Append(64, 0) // Whatever values on the stack.
.D64(0x0000000D) // junk that's not
.D64(0xF0000000) // a return address.
.Mark(&frame2_fp)
.D64(0)
.D64(0)
.Mark(&frame2_sp)
// frame 2
.Append(64, 0) // Whatever values on the stack.
.D64(0x0000000D) // junk that's not
.D64(0xF0000000); // a return address.
RegionFromSection();
raw_context.iregs[MD_CONTEXT_ARM64_REG_PC] = 0x40005510;
raw_context.iregs[MD_CONTEXT_ARM64_REG_LR] = return_address1;
raw_context.iregs[MD_CONTEXT_ARM64_REG_FP] = frame1_fp.Value();
raw_context.iregs[MD_CONTEXT_ARM64_REG_SP] = stack_section.start().Value();
StackFrameSymbolizer frame_symbolizer(&supplier, &resolver);
StackwalkerARM64 walker(&system_info, &raw_context,
&stack_region, &modules, &frame_symbolizer);
vector<const CodeModule*> modules_without_symbols;
vector<const CodeModule*> modules_with_corrupt_symbols;
ASSERT_TRUE(walker.Walk(&call_stack, &modules_without_symbols,
&modules_with_corrupt_symbols));
ASSERT_EQ(2U, modules_without_symbols.size());
ASSERT_EQ("module1", modules_without_symbols[0]->debug_file());
ASSERT_EQ("module2", modules_without_symbols[1]->debug_file());
ASSERT_EQ(0U, modules_with_corrupt_symbols.size());
frames = call_stack.frames();
ASSERT_EQ(3U, frames->size());
StackFrameARM64 *frame0 = static_cast<StackFrameARM64 *>(frames->at(0));
EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust);
ASSERT_EQ(StackFrameARM64::CONTEXT_VALID_ALL,
frame0->context_validity);
EXPECT_EQ(0, memcmp(&raw_context, &frame0->context, sizeof(raw_context)));
StackFrameARM64 *frame1 = static_cast<StackFrameARM64 *>(frames->at(1));
EXPECT_EQ(StackFrame::FRAME_TRUST_FP, frame1->trust);
ASSERT_EQ((StackFrameARM64::CONTEXT_VALID_PC |
StackFrameARM64::CONTEXT_VALID_LR |
StackFrameARM64::CONTEXT_VALID_FP |
StackFrameARM64::CONTEXT_VALID_SP),
frame1->context_validity);
EXPECT_EQ(return_address1, frame1->context.iregs[MD_CONTEXT_ARM64_REG_PC]);
EXPECT_EQ(return_address2, frame1->context.iregs[MD_CONTEXT_ARM64_REG_LR]);
EXPECT_EQ(frame1_sp.Value(), frame1->context.iregs[MD_CONTEXT_ARM64_REG_SP]);
EXPECT_EQ(frame2_fp.Value(),
frame1->context.iregs[MD_CONTEXT_ARM64_REG_FP]);
StackFrameARM64 *frame2 = static_cast<StackFrameARM64 *>(frames->at(2));
EXPECT_EQ(StackFrame::FRAME_TRUST_FP, frame2->trust);
ASSERT_EQ((StackFrameARM64::CONTEXT_VALID_PC |
StackFrameARM64::CONTEXT_VALID_LR |
StackFrameARM64::CONTEXT_VALID_FP |
StackFrameARM64::CONTEXT_VALID_SP),
frame2->context_validity);
EXPECT_EQ(return_address2, frame2->context.iregs[MD_CONTEXT_ARM64_REG_PC]);
EXPECT_EQ(0U, frame2->context.iregs[MD_CONTEXT_ARM64_REG_LR]);
EXPECT_EQ(frame2_sp.Value(), frame2->context.iregs[MD_CONTEXT_ARM64_REG_SP]);
EXPECT_EQ(0U, frame2->context.iregs[MD_CONTEXT_ARM64_REG_FP]);
}
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