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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>
// cfi_frame_info_unittest.cc: Unit tests for CFIFrameInfo,
// CFIRuleParser, CFIFrameInfoParseHandler, and SimpleCFIWalker.
#include <string.h>
#include "breakpad_googletest_includes.h"
#include "common/using_std_string.h"
#include "processor/cfi_frame_info.h"
#include "google_breakpad/processor/memory_region.h"
using google_breakpad::CFIFrameInfo;
using google_breakpad::CFIFrameInfoParseHandler;
using google_breakpad::CFIRuleParser;
using google_breakpad::MemoryRegion;
using google_breakpad::SimpleCFIWalker;
using testing::_;
using testing::A;
using testing::AtMost;
using testing::DoAll;
using testing::Return;
using testing::SetArgumentPointee;
using testing::Test;
class MockMemoryRegion: public MemoryRegion {
public:
MOCK_CONST_METHOD0(GetBase, uint64_t());
MOCK_CONST_METHOD0(GetSize, uint32_t());
MOCK_CONST_METHOD2(GetMemoryAtAddress, bool(uint64_t, uint8_t *));
MOCK_CONST_METHOD2(GetMemoryAtAddress, bool(uint64_t, uint16_t *));
MOCK_CONST_METHOD2(GetMemoryAtAddress, bool(uint64_t, uint32_t *));
MOCK_CONST_METHOD2(GetMemoryAtAddress, bool(uint64_t, uint64_t *));
MOCK_CONST_METHOD0(Print, void());
};
// Handy definitions for all tests.
struct CFIFixture {
// Set up the mock memory object to expect no references.
void ExpectNoMemoryReferences() {
EXPECT_CALL(memory, GetBase()).Times(0);
EXPECT_CALL(memory, GetSize()).Times(0);
EXPECT_CALL(memory, GetMemoryAtAddress(_, A<uint8_t *>())).Times(0);
EXPECT_CALL(memory, GetMemoryAtAddress(_, A<uint16_t *>())).Times(0);
EXPECT_CALL(memory, GetMemoryAtAddress(_, A<uint32_t *>())).Times(0);
EXPECT_CALL(memory, GetMemoryAtAddress(_, A<uint64_t *>())).Times(0);
}
CFIFrameInfo cfi;
MockMemoryRegion memory;
CFIFrameInfo::RegisterValueMap<uint64_t> registers, caller_registers;
};
class Simple: public CFIFixture, public Test { };
// FindCallerRegs should fail if no .cfa rule is provided.
TEST_F(Simple, NoCFA) {
ExpectNoMemoryReferences();
cfi.SetRARule("0");
ASSERT_FALSE(cfi.FindCallerRegs<uint64_t>(registers, memory,
&caller_registers));
ASSERT_EQ(".ra: 0", cfi.Serialize());
}
// FindCallerRegs should fail if no .ra rule is provided.
TEST_F(Simple, NoRA) {
ExpectNoMemoryReferences();
cfi.SetCFARule("0");
ASSERT_FALSE(cfi.FindCallerRegs<uint64_t>(registers, memory,
&caller_registers));
ASSERT_EQ(".cfa: 0", cfi.Serialize());
}
TEST_F(Simple, SetCFAAndRARule) {
ExpectNoMemoryReferences();
cfi.SetCFARule("330903416631436410");
cfi.SetRARule("5870666104170902211");
ASSERT_TRUE(cfi.FindCallerRegs<uint64_t>(registers, memory,
&caller_registers));
ASSERT_EQ(2U, caller_registers.size());
ASSERT_EQ(330903416631436410ULL, caller_registers[".cfa"]);
ASSERT_EQ(5870666104170902211ULL, caller_registers[".ra"]);
ASSERT_EQ(".cfa: 330903416631436410 .ra: 5870666104170902211",
cfi.Serialize());
}
TEST_F(Simple, SetManyRules) {
ExpectNoMemoryReferences();
cfi.SetCFARule("$temp1 68737028 = $temp2 61072337 = $temp1 $temp2 -");
cfi.SetRARule(".cfa 99804755 +");
cfi.SetRegisterRule("register1", ".cfa 54370437 *");
cfi.SetRegisterRule("vodkathumbscrewingly", "24076308 .cfa +");
cfi.SetRegisterRule("pubvexingfjordschmaltzy", ".cfa 29801007 -");
cfi.SetRegisterRule("uncopyrightables", "92642917 .cfa /");
ASSERT_TRUE(cfi.FindCallerRegs<uint64_t>(registers, memory,
&caller_registers));
ASSERT_EQ(6U, caller_registers.size());
ASSERT_EQ(7664691U, caller_registers[".cfa"]);
ASSERT_EQ(107469446U, caller_registers[".ra"]);
ASSERT_EQ(416732599139967ULL, caller_registers["register1"]);
ASSERT_EQ(31740999U, caller_registers["vodkathumbscrewingly"]);
ASSERT_EQ(-22136316ULL, caller_registers["pubvexingfjordschmaltzy"]);
ASSERT_EQ(12U, caller_registers["uncopyrightables"]);
ASSERT_EQ(".cfa: $temp1 68737028 = $temp2 61072337 = $temp1 $temp2 - "
".ra: .cfa 99804755 + "
"pubvexingfjordschmaltzy: .cfa 29801007 - "
"register1: .cfa 54370437 * "
"uncopyrightables: 92642917 .cfa / "
"vodkathumbscrewingly: 24076308 .cfa +",
cfi.Serialize());
}
TEST_F(Simple, RulesOverride) {
ExpectNoMemoryReferences();
cfi.SetCFARule("330903416631436410");
cfi.SetRARule("5870666104170902211");
cfi.SetCFARule("2828089117179001");
ASSERT_TRUE(cfi.FindCallerRegs<uint64_t>(registers, memory,
&caller_registers));
ASSERT_EQ(2U, caller_registers.size());
ASSERT_EQ(2828089117179001ULL, caller_registers[".cfa"]);
ASSERT_EQ(5870666104170902211ULL, caller_registers[".ra"]);
ASSERT_EQ(".cfa: 2828089117179001 .ra: 5870666104170902211",
cfi.Serialize());
}
class Scope: public CFIFixture, public Test { };
// There should be no value for .cfa in scope when evaluating the CFA rule.
TEST_F(Scope, CFALacksCFA) {
ExpectNoMemoryReferences();
cfi.SetCFARule(".cfa");
cfi.SetRARule("0");
ASSERT_FALSE(cfi.FindCallerRegs<uint64_t>(registers, memory,
&caller_registers));
}
// There should be no value for .ra in scope when evaluating the CFA rule.
TEST_F(Scope, CFALacksRA) {
ExpectNoMemoryReferences();
cfi.SetCFARule(".ra");
cfi.SetRARule("0");
ASSERT_FALSE(cfi.FindCallerRegs<uint64_t>(registers, memory,
&caller_registers));
}
// The current frame's registers should be in scope when evaluating
// the CFA rule.
TEST_F(Scope, CFASeesCurrentRegs) {
ExpectNoMemoryReferences();
registers[".baraminology"] = 0x06a7bc63e4f13893ULL;
registers[".ornithorhynchus"] = 0x5e0bf850bafce9d2ULL;
cfi.SetCFARule(".baraminology .ornithorhynchus +");
cfi.SetRARule("0");
ASSERT_TRUE(cfi.FindCallerRegs<uint64_t>(registers, memory,
&caller_registers));
ASSERT_EQ(2U, caller_registers.size());
ASSERT_EQ(0x06a7bc63e4f13893ULL + 0x5e0bf850bafce9d2ULL,
caller_registers[".cfa"]);
}
// .cfa should be in scope in the return address expression.
TEST_F(Scope, RASeesCFA) {
ExpectNoMemoryReferences();
cfi.SetCFARule("48364076");
cfi.SetRARule(".cfa");
ASSERT_TRUE(cfi.FindCallerRegs<uint64_t>(registers, memory,
&caller_registers));
ASSERT_EQ(2U, caller_registers.size());
ASSERT_EQ(48364076U, caller_registers[".ra"]);
}
// There should be no value for .ra in scope when evaluating the CFA rule.
TEST_F(Scope, RALacksRA) {
ExpectNoMemoryReferences();
cfi.SetCFARule("0");
cfi.SetRARule(".ra");
ASSERT_FALSE(cfi.FindCallerRegs<uint64_t>(registers, memory,
&caller_registers));
}
// The current frame's registers should be in scope in the return
// address expression.
TEST_F(Scope, RASeesCurrentRegs) {
ExpectNoMemoryReferences();
registers["noachian"] = 0x54dc4a5d8e5eb503ULL;
cfi.SetCFARule("10359370");
cfi.SetRARule("noachian");
ASSERT_TRUE(cfi.FindCallerRegs<uint64_t>(registers, memory,
&caller_registers));
ASSERT_EQ(2U, caller_registers.size());
ASSERT_EQ(0x54dc4a5d8e5eb503ULL, caller_registers[".ra"]);
}
// .cfa should be in scope for register rules.
TEST_F(Scope, RegistersSeeCFA) {
ExpectNoMemoryReferences();
cfi.SetCFARule("6515179");
cfi.SetRARule(".cfa");
cfi.SetRegisterRule("rogerian", ".cfa");
ASSERT_TRUE(cfi.FindCallerRegs<uint64_t>(registers, memory,
&caller_registers));
ASSERT_EQ(3U, caller_registers.size());
ASSERT_EQ(6515179U, caller_registers["rogerian"]);
}
// The return address should not be in scope for register rules.
TEST_F(Scope, RegsLackRA) {
ExpectNoMemoryReferences();
cfi.SetCFARule("42740329");
cfi.SetRARule("27045204");
cfi.SetRegisterRule("$r1", ".ra");
ASSERT_FALSE(cfi.FindCallerRegs<uint64_t>(registers, memory,
&caller_registers));
}
// Register rules can see the current frame's register values.
TEST_F(Scope, RegsSeeRegs) {
ExpectNoMemoryReferences();
registers["$r1"] = 0x6ed3582c4bedb9adULL;
registers["$r2"] = 0xd27d9e742b8df6d0ULL;
cfi.SetCFARule("88239303");
cfi.SetRARule("30503835");
cfi.SetRegisterRule("$r1", "$r1 42175211 = $r2");
cfi.SetRegisterRule("$r2", "$r2 21357221 = $r1");
ASSERT_TRUE(cfi.FindCallerRegs<uint64_t>(registers, memory,
&caller_registers));
ASSERT_EQ(4U, caller_registers.size());
ASSERT_EQ(0xd27d9e742b8df6d0ULL, caller_registers["$r1"]);
ASSERT_EQ(0x6ed3582c4bedb9adULL, caller_registers["$r2"]);
}
// Each rule's temporaries are separate.
TEST_F(Scope, SeparateTempsRA) {
ExpectNoMemoryReferences();
cfi.SetCFARule("$temp1 76569129 = $temp1");
cfi.SetRARule("0");
ASSERT_TRUE(cfi.FindCallerRegs<uint64_t>(registers, memory,
&caller_registers));
cfi.SetCFARule("$temp1 76569129 = $temp1");
cfi.SetRARule("$temp1");
ASSERT_FALSE(cfi.FindCallerRegs<uint64_t>(registers, memory,
&caller_registers));
}
class MockCFIRuleParserHandler: public CFIRuleParser::Handler {
public:
MOCK_METHOD1(CFARule, void(const string &));
MOCK_METHOD1(RARule, void(const string &));
MOCK_METHOD2(RegisterRule, void(const string &, const string &));
};
// A fixture class for testing CFIRuleParser.
class CFIParserFixture {
public:
CFIParserFixture() : parser(&mock_handler) {
// Expect no parsing results to be reported to mock_handler. Individual
// tests can override this.
EXPECT_CALL(mock_handler, CFARule(_)).Times(0);
EXPECT_CALL(mock_handler, RARule(_)).Times(0);
EXPECT_CALL(mock_handler, RegisterRule(_, _)).Times(0);
}
MockCFIRuleParserHandler mock_handler;
CFIRuleParser parser;
};
class Parser: public CFIParserFixture, public Test { };
TEST_F(Parser, Empty) {
EXPECT_FALSE(parser.Parse(""));
}
TEST_F(Parser, LoneColon) {
EXPECT_FALSE(parser.Parse(":"));
}
TEST_F(Parser, CFANoExpr) {
EXPECT_FALSE(parser.Parse(".cfa:"));
}
TEST_F(Parser, CFANoColonNoExpr) {
EXPECT_FALSE(parser.Parse(".cfa"));
}
TEST_F(Parser, RANoExpr) {
EXPECT_FALSE(parser.Parse(".ra:"));
}
TEST_F(Parser, RANoColonNoExpr) {
EXPECT_FALSE(parser.Parse(".ra"));
}
TEST_F(Parser, RegNoExpr) {
EXPECT_FALSE(parser.Parse("reg:"));
}
TEST_F(Parser, NoName) {
EXPECT_FALSE(parser.Parse("expr"));
}
TEST_F(Parser, NoNameTwo) {
EXPECT_FALSE(parser.Parse("expr1 expr2"));
}
TEST_F(Parser, StartsWithExpr) {
EXPECT_FALSE(parser.Parse("expr1 reg: expr2"));
}
TEST_F(Parser, CFA) {
EXPECT_CALL(mock_handler, CFARule("spleen")).WillOnce(Return());
EXPECT_TRUE(parser.Parse(".cfa: spleen"));
}
TEST_F(Parser, RA) {
EXPECT_CALL(mock_handler, RARule("notoriety")).WillOnce(Return());
EXPECT_TRUE(parser.Parse(".ra: notoriety"));
}
TEST_F(Parser, Reg) {
EXPECT_CALL(mock_handler, RegisterRule("nemo", "mellifluous"))
.WillOnce(Return());
EXPECT_TRUE(parser.Parse("nemo: mellifluous"));
}
TEST_F(Parser, CFARARegs) {
EXPECT_CALL(mock_handler, CFARule("cfa expression")).WillOnce(Return());
EXPECT_CALL(mock_handler, RARule("ra expression")).WillOnce(Return());
EXPECT_CALL(mock_handler, RegisterRule("galba", "praetorian"))
.WillOnce(Return());
EXPECT_CALL(mock_handler, RegisterRule("otho", "vitellius"))
.WillOnce(Return());
EXPECT_TRUE(parser.Parse(".cfa: cfa expression .ra: ra expression "
"galba: praetorian otho: vitellius"));
}
TEST_F(Parser, Whitespace) {
EXPECT_CALL(mock_handler, RegisterRule("r1", "r1 expression"))
.WillOnce(Return());
EXPECT_CALL(mock_handler, RegisterRule("r2", "r2 expression"))
.WillOnce(Return());
EXPECT_TRUE(parser.Parse(" r1:\tr1\nexpression \tr2:\t\rr2\r\n "
"expression \n"));
}
TEST_F(Parser, WhitespaceLoneColon) {
EXPECT_FALSE(parser.Parse(" \n:\t "));
}
TEST_F(Parser, EmptyName) {
EXPECT_CALL(mock_handler, RegisterRule("reg", _))
.Times(AtMost(1))
.WillRepeatedly(Return());
EXPECT_FALSE(parser.Parse("reg: expr1 : expr2"));
}
TEST_F(Parser, RuleLoneColon) {
EXPECT_CALL(mock_handler, RegisterRule("r1", "expr"))
.Times(AtMost(1))
.WillRepeatedly(Return());
EXPECT_FALSE(parser.Parse(" r1: expr :"));
}
TEST_F(Parser, RegNoExprRule) {
EXPECT_CALL(mock_handler, RegisterRule("r1", "expr"))
.Times(AtMost(1))
.WillRepeatedly(Return());
EXPECT_FALSE(parser.Parse("r0: r1: expr"));
}
class ParseHandlerFixture: public CFIFixture {
public:
ParseHandlerFixture() : CFIFixture(), handler(&cfi) { }
CFIFrameInfoParseHandler handler;
};
class ParseHandler: public ParseHandlerFixture, public Test { };
TEST_F(ParseHandler, CFARARule) {
handler.CFARule("reg-for-cfa");
handler.RARule("reg-for-ra");
registers["reg-for-cfa"] = 0x268a9a4a3821a797ULL;
registers["reg-for-ra"] = 0x6301b475b8b91c02ULL;
ASSERT_TRUE(cfi.FindCallerRegs<uint64_t>(registers, memory,
&caller_registers));
ASSERT_EQ(0x268a9a4a3821a797ULL, caller_registers[".cfa"]);
ASSERT_EQ(0x6301b475b8b91c02ULL, caller_registers[".ra"]);
}
TEST_F(ParseHandler, RegisterRules) {
handler.CFARule("reg-for-cfa");
handler.RARule("reg-for-ra");
handler.RegisterRule("reg1", "reg-for-reg1");
handler.RegisterRule("reg2", "reg-for-reg2");
registers["reg-for-cfa"] = 0x268a9a4a3821a797ULL;
registers["reg-for-ra"] = 0x6301b475b8b91c02ULL;
registers["reg-for-reg1"] = 0x06cde8e2ff062481ULL;
registers["reg-for-reg2"] = 0xff0c4f76403173e2ULL;
ASSERT_TRUE(cfi.FindCallerRegs<uint64_t>(registers, memory,
&caller_registers));
ASSERT_EQ(0x268a9a4a3821a797ULL, caller_registers[".cfa"]);
ASSERT_EQ(0x6301b475b8b91c02ULL, caller_registers[".ra"]);
ASSERT_EQ(0x06cde8e2ff062481ULL, caller_registers["reg1"]);
ASSERT_EQ(0xff0c4f76403173e2ULL, caller_registers["reg2"]);
}
struct SimpleCFIWalkerFixture {
struct RawContext {
uint64_t r0, r1, r2, r3, r4, sp, pc;
};
enum Validity {
R0_VALID = 0x01,
R1_VALID = 0x02,
R2_VALID = 0x04,
R3_VALID = 0x08,
R4_VALID = 0x10,
SP_VALID = 0x20,
PC_VALID = 0x40
};
typedef SimpleCFIWalker<uint64_t, RawContext> CFIWalker;
SimpleCFIWalkerFixture()
: walker(register_map,
sizeof(register_map) / sizeof(register_map[0])) { }
static CFIWalker::RegisterSet register_map[7];
CFIFrameInfo call_frame_info;
CFIWalker walker;
MockMemoryRegion memory;
RawContext callee_context, caller_context;
};
SimpleCFIWalkerFixture::CFIWalker::RegisterSet
SimpleCFIWalkerFixture::register_map[7] = {
{ "r0", NULL, true, R0_VALID, &RawContext::r0 },
{ "r1", NULL, true, R1_VALID, &RawContext::r1 },
{ "r2", NULL, false, R2_VALID, &RawContext::r2 },
{ "r3", NULL, false, R3_VALID, &RawContext::r3 },
{ "r4", NULL, true, R4_VALID, &RawContext::r4 },
{ "sp", ".cfa", true, SP_VALID, &RawContext::sp },
{ "pc", ".ra", true, PC_VALID, &RawContext::pc },
};
class SimpleWalker: public SimpleCFIWalkerFixture, public Test { };
TEST_F(SimpleWalker, Walk) {
// Stack_top is the current stack pointer, pointing to the lowest
// address of a frame that looks like this (all 64-bit words):
//
// sp -> saved r0
// garbage
// return address
// cfa ->
//
// r0 has been saved on the stack.
// r1 has been saved in r2.
// r2 and r3 are not recoverable.
// r4 is not recoverable, even though it is a callee-saves register.
// Some earlier frame's unwinder must have failed to recover it.
uint64_t stack_top = 0x83254944b20d5512ULL;
// Saved r0.
EXPECT_CALL(memory,
GetMemoryAtAddress(stack_top, A<uint64_t *>()))
.WillRepeatedly(DoAll(SetArgumentPointee<1>(0xdc1975eba8602302ULL),
Return(true)));
// Saved return address.
EXPECT_CALL(memory,
GetMemoryAtAddress(stack_top + 16, A<uint64_t *>()))
.WillRepeatedly(DoAll(SetArgumentPointee<1>(0xba5ad6d9acce28deULL),
Return(true)));
call_frame_info.SetCFARule("sp 24 +");
call_frame_info.SetRARule(".cfa 8 - ^");
call_frame_info.SetRegisterRule("r0", ".cfa 24 - ^");
call_frame_info.SetRegisterRule("r1", "r2");
callee_context.r0 = 0x94e030ca79edd119ULL;
callee_context.r1 = 0x937b4d7e95ce52d9ULL;
callee_context.r2 = 0x5fe0027416b8b62aULL; // caller's r1
// callee_context.r3 is not valid in callee.
// callee_context.r4 is not valid in callee.
callee_context.sp = stack_top;
callee_context.pc = 0x25b21b224311d280ULL;
int callee_validity = R0_VALID | R1_VALID | R2_VALID | SP_VALID | PC_VALID;
memset(&caller_context, 0, sizeof(caller_context));
int caller_validity;
EXPECT_TRUE(walker.FindCallerRegisters(memory, call_frame_info,
callee_context, callee_validity,
&caller_context, &caller_validity));
EXPECT_EQ(R0_VALID | R1_VALID | SP_VALID | PC_VALID, caller_validity);
EXPECT_EQ(0xdc1975eba8602302ULL, caller_context.r0);
EXPECT_EQ(0x5fe0027416b8b62aULL, caller_context.r1);
EXPECT_EQ(stack_top + 24, caller_context.sp);
EXPECT_EQ(0xba5ad6d9acce28deULL, caller_context.pc);
}