| // Copyright 2016 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include <assert.h> |
| #include <atomic> |
| #include <inttypes.h> |
| #include <link.h> |
| #include <stdbool.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #include <launchpad/launchpad.h> |
| #include <launchpad/vmo.h> |
| #include <lib/backtrace-request/backtrace-request.h> |
| #include <test-utils/test-utils.h> |
| #include <unittest/unittest.h> |
| #include <zircon/process.h> |
| #include <zircon/processargs.h> |
| #include <zircon/syscalls.h> |
| #include <zircon/syscalls/debug.h> |
| #include <zircon/syscalls/exception.h> |
| #include <zircon/syscalls/object.h> |
| #include <zircon/syscalls/port.h> |
| #include <zircon/threads.h> |
| |
| #include "utils.h" |
| |
| namespace { |
| |
| typedef bool(wait_inferior_exception_handler_t)(zx_handle_t inferior, zx_handle_t port, |
| const zx_port_packet_t* packet, void* handler_arg); |
| |
| constexpr size_t kTestMemorySize = 8; |
| constexpr uint8_t kTestDataAdjust = 0x10; |
| |
| // Do the segv recovery test a number of times to stress test the API. |
| constexpr int kNumSegvTries = 4; |
| |
| constexpr int kNumExtraThreads = 4; |
| |
| // Produce a backtrace of sufficient size to be interesting but not excessive. |
| constexpr int kTestSegfaultDepth = 4; |
| |
| constexpr char kTestInferiorChildName[] = "inferior"; |
| // The segfault child is not used by the test. |
| // It exists for debugging purposes. |
| constexpr char kTestSegfaultChildName[] = "segfault"; |
| // Used for testing the s/w breakpoint insn. |
| constexpr char kTestSwbreakChildName[] = "swbreak"; |
| |
| std::atomic<int> extra_thread_count; |
| |
| uint64_t extract_pc_reg(const zx_thread_state_general_regs_t* regs) { |
| #if defined(__x86_64__) |
| return regs->rip; |
| #elif defined(__aarch64__) |
| return regs->pc; |
| #endif |
| } |
| |
| uint64_t extract_sp_reg(const zx_thread_state_general_regs_t* regs) { |
| #if defined(__x86_64__) |
| return regs->rsp; |
| #elif defined(__aarch64__) |
| return regs->sp; |
| #endif |
| } |
| |
| void test_memory_ops(zx_handle_t inferior, zx_handle_t thread) { |
| uint64_t test_data_addr = 0; |
| uint8_t test_data[kTestMemorySize]; |
| |
| zx_thread_state_general_regs_t regs; |
| read_inferior_gregs(thread, ®s); |
| |
| #if defined(__x86_64__) |
| test_data_addr = regs.r9; |
| #elif defined(__aarch64__) |
| test_data_addr = regs.r[9]; |
| #endif |
| |
| size_t size = read_inferior_memory(inferior, test_data_addr, test_data, sizeof(test_data)); |
| EXPECT_EQ(size, sizeof(test_data), "read_inferior_memory: short read"); |
| |
| for (unsigned i = 0; i < sizeof(test_data); ++i) { |
| EXPECT_EQ(test_data[i], i, "test_memory_ops"); |
| } |
| |
| for (unsigned i = 0; i < sizeof(test_data); ++i) { |
| test_data[i] = static_cast<uint8_t>(test_data[i] + kTestDataAdjust); |
| } |
| |
| size = write_inferior_memory(inferior, test_data_addr, test_data, sizeof(test_data)); |
| EXPECT_EQ(size, sizeof(test_data), "write_inferior_memory: short write"); |
| |
| // Note: Verification of the write is done in the inferior. |
| } |
| |
| void fix_inferior_segv(zx_handle_t thread) { |
| unittest_printf("Fixing inferior segv\n"); |
| |
| // The segv was because r8 == 0, change it to a usable value. See TestPrepAndSegv. |
| zx_thread_state_general_regs_t regs; |
| read_inferior_gregs(thread, ®s); |
| #if defined(__x86_64__) |
| regs.r8 = regs.rsp; |
| #elif defined(__aarch64__) |
| regs.r[8] = regs.sp; |
| #endif |
| write_inferior_gregs(thread, ®s); |
| } |
| |
| bool TestSegvPc(zx_handle_t thread) { |
| zx_thread_state_general_regs_t regs; |
| read_inferior_gregs(thread, ®s); |
| |
| #if defined(__x86_64__) |
| ASSERT_EQ(regs.rip, regs.r10, "fault PC does not match r10"); |
| #elif defined(__aarch64__) |
| ASSERT_EQ(regs.pc, regs.r[10], "fault PC does not match x10"); |
| #endif |
| return true; |
| } |
| |
| // A simpler exception handler. |
| // All exceptions are passed on to |handler|. |
| // Returns false if a test fails. |
| // Otherwise waits for the inferior to exit and returns true. |
| |
| bool wait_inferior_thread_worker(inferior_data_t* inferior_data, |
| wait_inferior_exception_handler_t* handler, void* handler_arg) { |
| zx_handle_t inferior = inferior_data->inferior; |
| zx_koid_t pid = tu_get_koid(inferior); |
| zx_handle_t eport = inferior_data->eport; |
| |
| while (true) { |
| zx_port_packet_t packet; |
| if (!read_exception(eport, &packet)) |
| return false; |
| |
| // Is the inferior gone? |
| if (ZX_PKT_IS_SIGNAL_REP(packet.type) && packet.key == pid && |
| (packet.signal.observed & ZX_PROCESS_TERMINATED)) { |
| unittest_printf("wait-inf: inferior gone\n"); |
| return true; |
| } |
| |
| if (!handler(inferior, eport, &packet, handler_arg)) |
| return false; |
| } |
| } |
| |
| struct wait_inf_args_t { |
| inferior_data_t* inferior_data; |
| wait_inferior_exception_handler_t* handler; |
| void* handler_arg; |
| }; |
| |
| int wait_inferior_thread_func(void* arg) { |
| wait_inf_args_t* args = static_cast<wait_inf_args_t*>(arg); |
| inferior_data_t* inferior_data = args->inferior_data; |
| wait_inferior_exception_handler_t* handler = args->handler; |
| void* handler_arg = args->handler_arg; |
| free(args); |
| |
| bool pass = wait_inferior_thread_worker(inferior_data, handler, handler_arg); |
| |
| return pass ? 0 : -1; |
| } |
| |
| thrd_t start_wait_inf_thread(inferior_data_t* inferior_data, |
| wait_inferior_exception_handler_t* handler, void* handler_arg) { |
| wait_inf_args_t* args = static_cast<wait_inf_args_t*>(tu_calloc(1, sizeof(*args))); |
| |
| // The proc handle is loaned to the thread. |
| // The caller of this function owns and must close it. |
| args->inferior_data = inferior_data; |
| args->handler = handler; |
| args->handler_arg = handler_arg; |
| |
| thrd_t wait_inferior_thread; |
| tu_thread_create_c11(&wait_inferior_thread, wait_inferior_thread_func, args, "wait-inf thread"); |
| return wait_inferior_thread; |
| } |
| |
| void join_wait_inf_thread(thrd_t wait_inf_thread) { |
| unittest_printf("Waiting for wait-inf thread\n"); |
| int thread_rc; |
| int ret = thrd_join(wait_inf_thread, &thread_rc); |
| EXPECT_EQ(ret, thrd_success, "thrd_join failed"); |
| EXPECT_EQ(thread_rc, 0, "unexpected wait-inf return"); |
| unittest_printf("wait-inf thread done\n"); |
| } |
| |
| bool expect_debugger_attached_eq(zx_handle_t inferior, bool expected, const char* msg) { |
| zx_info_process_t info; |
| // ZX_ASSERT returns false if the check fails. |
| ASSERT_EQ(zx_object_get_info(inferior, ZX_INFO_PROCESS, &info, sizeof(info), NULL, NULL), ZX_OK); |
| ASSERT_EQ(info.debugger_attached, expected, msg); |
| return true; |
| } |
| |
| // This returns a bool as it's a unittest "helper" routine. |
| // N.B. This runs on the wait-inferior thread. |
| |
| bool handle_thread_exiting(zx_handle_t inferior, zx_handle_t port, const zx_port_packet_t* packet) { |
| BEGIN_HELPER; |
| |
| zx_koid_t tid = packet->exception.tid; |
| zx_handle_t thread; |
| zx_status_t status = zx_object_get_child(inferior, tid, ZX_RIGHT_SAME_RIGHTS, &thread); |
| // If the process has exited then the kernel may have reaped the |
| // thread already. Check. |
| if (status == ZX_OK) { |
| zx_info_thread_t info = tu_thread_get_info(thread); |
| // The thread could still transition to DEAD here (if the |
| // process exits), so check for either DYING or DEAD. |
| EXPECT_TRUE(info.state == ZX_THREAD_STATE_DYING || info.state == ZX_THREAD_STATE_DEAD); |
| // If the state is DYING it would be nice to check that the |
| // value of |info.wait_exception_port_type| is DEBUGGER. Alas |
| // if the process has exited then the thread will get |
| // THREAD_SIGNAL_KILL which will cause |
| // UserThread::ExceptionHandlerExchange to exit before we've |
| // told the thread to "resume" from ZX_EXCP_THREAD_EXITING. |
| // The thread is still in the DYING state but it is no longer |
| // in an exception. Thus |info.wait_exception_port_type| can |
| // either be DEBUGGER or NONE. |
| EXPECT_TRUE(info.wait_exception_port_type == ZX_EXCEPTION_PORT_TYPE_NONE || |
| info.wait_exception_port_type == ZX_EXCEPTION_PORT_TYPE_DEBUGGER); |
| tu_handle_close(thread); |
| } else { |
| EXPECT_EQ(status, ZX_ERR_NOT_FOUND); |
| EXPECT_TRUE(tu_process_has_exited(inferior)); |
| } |
| unittest_printf("wait-inf: thread %" PRId64 " exited\n", tid); |
| // A thread is gone, but we only care about the process. |
| if (!resume_inferior(inferior, port, tid)) |
| return false; |
| |
| END_HELPER; |
| } |
| |
| // This returns a bool as it's a unittest "helper" routine. |
| // N.B. This runs on the wait-inferior thread. |
| |
| bool handle_expected_page_fault(zx_handle_t inferior, |
| zx_handle_t port, |
| const zx_port_packet_t* packet, |
| std::atomic<int>* segv_count) { |
| BEGIN_HELPER; |
| |
| unittest_printf("wait-inf: got page fault exception\n"); |
| |
| zx_koid_t tid = packet->exception.tid; |
| zx_handle_t thread = tu_get_thread(inferior, tid); |
| |
| dump_inferior_regs(thread); |
| |
| // Verify that the fault is at the PC we expected. |
| if (!TestSegvPc(thread)) |
| return false; |
| |
| // Do some tests that require a suspended inferior. |
| test_memory_ops(inferior, thread); |
| |
| fix_inferior_segv(thread); |
| // Useful for debugging, otherwise a bit too verbose. |
| // dump_inferior_regs(thread); |
| |
| // Increment this before resuming the inferior in case the inferior |
| // sends MSG_RECOVERED_FROM_CRASH and the testcase processes the message |
| // before we can increment it. |
| atomic_fetch_add(segv_count, 1); |
| |
| zx_status_t status = zx_task_resume_from_exception(thread, port, 0); |
| tu_handle_close(thread); |
| ASSERT_EQ(status, ZX_OK); |
| |
| END_HELPER; |
| } |
| |
| // N.B. This runs on the wait-inferior thread. |
| |
| bool debugger_test_exception_handler(zx_handle_t inferior, zx_handle_t port, |
| const zx_port_packet_t* packet, |
| void* handler_arg) { |
| BEGIN_HELPER; |
| |
| // Note: This may be NULL if the test is not expecting a page fault. |
| std::atomic<int>* segv_count = static_cast<std::atomic<int>*>(handler_arg); |
| |
| zx_koid_t pid = tu_get_koid(inferior); |
| |
| if (ZX_PKT_IS_SIGNAL_REP(packet->type)) { |
| ASSERT_TRUE(packet->key != pid); |
| // Must be a signal on one of the threads. |
| // Here we're only expecting TERMINATED. |
| ASSERT_TRUE(packet->signal.observed & ZX_THREAD_TERMINATED); |
| } else { |
| ASSERT_TRUE(ZX_PKT_IS_EXCEPTION(packet->type)); |
| |
| zx_koid_t tid = packet->exception.tid; |
| |
| switch (packet->type) { |
| case ZX_EXCP_THREAD_STARTING: |
| unittest_printf("wait-inf: inferior started\n"); |
| if (!resume_inferior(inferior, port, tid)) |
| return false; |
| break; |
| |
| case ZX_EXCP_THREAD_EXITING: |
| // N.B. We could get thread exiting messages from previous |
| // tests. |
| EXPECT_TRUE(handle_thread_exiting(inferior, port, packet)); |
| break; |
| |
| case ZX_EXCP_FATAL_PAGE_FAULT: |
| ASSERT_NONNULL(segv_count); |
| ASSERT_TRUE(handle_expected_page_fault(inferior, port, packet, segv_count)); |
| break; |
| |
| default: { |
| char msg[128]; |
| snprintf(msg, sizeof(msg), "unexpected packet type: 0x%x", packet->type); |
| ASSERT_TRUE(false, msg); |
| __UNREACHABLE; |
| } |
| } |
| } |
| |
| END_HELPER; |
| } |
| |
| bool DebuggerTest() { |
| BEGIN_TEST; |
| |
| launchpad_t* lp; |
| zx_handle_t inferior, channel; |
| if (!setup_inferior(kTestInferiorChildName, &lp, &inferior, &channel)) |
| return false; |
| |
| std::atomic<int> segv_count; |
| |
| expect_debugger_attached_eq(inferior, false, "debugger should not appear attached"); |
| zx_handle_t eport = tu_io_port_create(); |
| size_t max_threads = 10; |
| inferior_data_t* inferior_data = attach_inferior(inferior, eport, max_threads); |
| thrd_t wait_inf_thread = |
| start_wait_inf_thread(inferior_data, debugger_test_exception_handler, &segv_count); |
| EXPECT_NE(eport, ZX_HANDLE_INVALID); |
| expect_debugger_attached_eq(inferior, true, "debugger should appear attached"); |
| |
| if (!start_inferior(lp)) |
| return false; |
| if (!verify_inferior_running(channel)) |
| return false; |
| |
| segv_count.store(0); |
| enum message msg; |
| send_msg(channel, MSG_CRASH_AND_RECOVER_TEST); |
| if (!recv_msg(channel, &msg)) |
| return false; |
| EXPECT_EQ(msg, MSG_RECOVERED_FROM_CRASH, "unexpected response from crash"); |
| EXPECT_EQ(segv_count.load(), kNumSegvTries, "segv tests terminated prematurely"); |
| |
| if (!shutdown_inferior(channel, inferior)) |
| return false; |
| |
| // Stop the waiter thread before closing the eport that it's waiting on. |
| join_wait_inf_thread(wait_inf_thread); |
| |
| detach_inferior(inferior_data, false); |
| |
| expect_debugger_attached_eq(inferior, true, "debugger should still appear attached"); |
| tu_handle_close(eport); |
| expect_debugger_attached_eq(inferior, false, "debugger should no longer appear attached"); |
| |
| tu_handle_close(channel); |
| tu_handle_close(inferior); |
| |
| END_TEST; |
| } |
| |
| bool DebuggerThreadListTest() { |
| BEGIN_TEST; |
| |
| launchpad_t* lp; |
| zx_handle_t inferior, channel; |
| if (!setup_inferior(kTestInferiorChildName, &lp, &inferior, &channel)) |
| return false; |
| |
| zx_handle_t eport = tu_io_port_create(); |
| size_t max_threads = 10; |
| inferior_data_t* inferior_data = attach_inferior(inferior, eport, max_threads); |
| thrd_t wait_inf_thread = |
| start_wait_inf_thread(inferior_data, debugger_test_exception_handler, NULL); |
| EXPECT_NE(eport, ZX_HANDLE_INVALID); |
| |
| if (!start_inferior(lp)) |
| return false; |
| if (!verify_inferior_running(channel)) |
| return false; |
| |
| enum message msg; |
| send_msg(channel, MSG_START_EXTRA_THREADS); |
| if (!recv_msg(channel, &msg)) |
| return false; |
| EXPECT_EQ(msg, MSG_EXTRA_THREADS_STARTED, "unexpected response when starting extra threads"); |
| |
| // This doesn't use tu_process_get_threads() because here we're testing |
| // various aspects of ZX_INFO_PROCESS_THREADS. |
| uint32_t buf_size = 100 * sizeof(zx_koid_t); |
| size_t num_threads; |
| zx_koid_t* threads = static_cast<zx_koid_t*>(tu_malloc(buf_size)); |
| zx_status_t status = zx_object_get_info(inferior, ZX_INFO_PROCESS_THREADS, threads, buf_size, |
| &num_threads, NULL); |
| ASSERT_EQ(status, ZX_OK); |
| |
| // There should be at least 1+kNumExtraThreads threads in the result. |
| ASSERT_GE(num_threads, 1 + kNumExtraThreads, "zx_object_get_info failed"); |
| |
| // Verify each entry is valid. |
| for (uint32_t i = 0; i < num_threads; ++i) { |
| zx_koid_t koid = threads[i]; |
| unittest_printf("Looking up thread %llu\n", (long long)koid); |
| zx_handle_t thread = tu_get_thread(inferior, koid); |
| zx_info_handle_basic_t info; |
| status = zx_object_get_info(thread, ZX_INFO_HANDLE_BASIC, &info, sizeof(info), NULL, NULL); |
| EXPECT_EQ(status, ZX_OK, "zx_object_get_info failed"); |
| EXPECT_EQ(info.type, ZX_OBJ_TYPE_THREAD, "not a thread"); |
| } |
| |
| if (!shutdown_inferior(channel, inferior)) |
| return false; |
| |
| // Stop the waiter thread before closing the eport that it's waiting on. |
| join_wait_inf_thread(wait_inf_thread); |
| |
| detach_inferior(inferior_data, true); |
| |
| tu_handle_close(eport); |
| tu_handle_close(channel); |
| tu_handle_close(inferior); |
| |
| END_TEST; |
| } |
| |
| bool PropertyProcessDebugAddrTest() { |
| BEGIN_TEST; |
| |
| zx_handle_t self = zx_process_self(); |
| |
| // We shouldn't be able to set it. |
| uintptr_t debug_addr = 42; |
| zx_status_t status = |
| zx_object_set_property(self, ZX_PROP_PROCESS_DEBUG_ADDR, &debug_addr, sizeof(debug_addr)); |
| ASSERT_EQ(status, ZX_ERR_ACCESS_DENIED); |
| |
| // Some minimal verification that the value is correct. |
| |
| status = |
| zx_object_get_property(self, ZX_PROP_PROCESS_DEBUG_ADDR, &debug_addr, sizeof(debug_addr)); |
| ASSERT_EQ(status, ZX_OK); |
| |
| // These are all dsos we link with. See rules.mk. |
| const char* launchpad_so = "liblaunchpad.so"; |
| bool found_launchpad = false; |
| const char* libc_so = "libc.so"; |
| bool found_libc = false; |
| const char* test_utils_so = "libtest-utils.so"; |
| bool found_test_utils = false; |
| const char* unittest_so = "libunittest.so"; |
| bool found_unittest = false; |
| |
| const r_debug* debug = (r_debug*)debug_addr; |
| const link_map* lmap = debug->r_map; |
| |
| EXPECT_EQ(debug->r_state, r_debug::RT_CONSISTENT); |
| |
| while (lmap != NULL) { |
| if (strcmp(lmap->l_name, launchpad_so) == 0) |
| found_launchpad = true; |
| else if (strcmp(lmap->l_name, libc_so) == 0) |
| found_libc = true; |
| else if (strcmp(lmap->l_name, test_utils_so) == 0) |
| found_test_utils = true; |
| else if (strcmp(lmap->l_name, unittest_so) == 0) |
| found_unittest = true; |
| lmap = lmap->l_next; |
| } |
| |
| EXPECT_TRUE(found_launchpad); |
| EXPECT_TRUE(found_libc); |
| EXPECT_TRUE(found_test_utils); |
| EXPECT_TRUE(found_unittest); |
| |
| END_TEST; |
| } |
| |
| int write_text_segment_helper() __ALIGNED(8); |
| int write_text_segment_helper() { |
| /* This function needs to be at least two bytes in size as we set a |
| breakpoint, figuratively speaking, on write_text_segment_helper + 1 |
| to ensure the address is not page aligned. Returning some random value |
| will ensure that. */ |
| return 42; |
| } |
| |
| bool WriteTextSegment() { |
| BEGIN_TEST; |
| |
| zx_handle_t self = zx_process_self(); |
| |
| // Exercise ZX-739 |
| // Pretend we're writing a s/w breakpoint to the start of this function. |
| |
| // write_text_segment_helper is suitably aligned, add 1 to ensure the |
| // byte we write is not page aligned. |
| uintptr_t addr = (uintptr_t)write_text_segment_helper + 1; |
| uint8_t previous_byte; |
| size_t size = read_inferior_memory(self, addr, &previous_byte, sizeof(previous_byte)); |
| EXPECT_EQ(size, sizeof(previous_byte)); |
| |
| uint8_t byte_to_write = 0; |
| size = write_inferior_memory(self, addr, &byte_to_write, sizeof(byte_to_write)); |
| EXPECT_EQ(size, sizeof(byte_to_write)); |
| |
| size = write_inferior_memory(self, addr, &previous_byte, sizeof(previous_byte)); |
| EXPECT_EQ(size, sizeof(previous_byte)); |
| |
| END_TEST; |
| } |
| |
| // These are "call-saved" registers used in the test. |
| #if defined(__x86_64__) |
| #define REG_ACCESS_TEST_REG r15 |
| #define REG_ACCESS_TEST_REG_NAME "r15" |
| #elif defined(__aarch64__) |
| #define REG_ACCESS_TEST_REG r[28] |
| #define REG_ACCESS_TEST_REG_NAME "x28" |
| #endif |
| |
| // Note: Neither of these can be zero. |
| const uint64_t reg_access_initial_value = 0xee112233445566eeull; |
| const uint64_t reg_access_write_test_value = 0xee665544332211eeull; |
| |
| struct suspended_reg_access_arg { |
| zx_handle_t channel; |
| uint64_t initial_value; |
| uint64_t result; |
| uint64_t pc, sp; |
| }; |
| |
| int reg_access_thread_func(void* arg_) { |
| suspended_reg_access_arg* arg = static_cast<suspended_reg_access_arg*>(arg_); |
| |
| send_msg(arg->channel, MSG_PONG); |
| |
| // The loop has to be written in assembler as we cannot control what |
| // the compiler does with our "reserved" registers outside of the asm; |
| // they're not really reserved in the way we need them to be: the compiler |
| // is free to do with them whatever it wants outside of the assembler. |
| // We do make the assumption that test_reg will not contain |
| // |reg_access_initial_value| until it is set by the assembler. |
| |
| uint64_t initial_value = arg->initial_value; |
| uint64_t result = 0; |
| uint64_t pc = 0; |
| uint64_t sp = 0; |
| |
| // The maximum number of bytes in the assembly. |
| // This doesn't have to be perfect. It's used to verify the value read for |
| // $pc is within some reasonable range. |
| #define REG_ACCESS_MAX_LOOP_SIZE 64 |
| |
| #ifdef __x86_64__ |
| __asm__("\ |
| lea .(%%rip), %[pc]\n\ |
| mov %%rsp, %[sp]\n\ |
| mov %[initial_value], %%" REG_ACCESS_TEST_REG_NAME "\n\ |
| 2:\n\ |
| pause\n\ |
| cmp %[initial_value], %%" REG_ACCESS_TEST_REG_NAME "\n\ |
| je 2b\n\ |
| mov %%" REG_ACCESS_TEST_REG_NAME ", %[result]" |
| : [result] "=r"(result), [pc] "=&r"(pc), [sp] "=&r"(sp) |
| : [initial_value] "r"(initial_value) |
| : REG_ACCESS_TEST_REG_NAME); |
| #endif |
| |
| #ifdef __aarch64__ |
| __asm__("\ |
| adr %[pc], .\n\ |
| mov %[sp], sp\n\ |
| mov " REG_ACCESS_TEST_REG_NAME ", %[initial_value]\n\ |
| 1:\n\ |
| yield\n\ |
| cmp %[initial_value], " REG_ACCESS_TEST_REG_NAME "\n\ |
| b.eq 1b\n\ |
| mov %[result], " REG_ACCESS_TEST_REG_NAME |
| : [result] "=r"(result), [pc] "=&r"(pc), [sp] "=&r"(sp) |
| : [initial_value] "r"(initial_value) |
| : REG_ACCESS_TEST_REG_NAME); |
| #endif |
| |
| arg->result = result; |
| arg->pc = pc; |
| arg->sp = sp; |
| |
| tu_handle_close(arg->channel); |
| |
| return 0; |
| } |
| |
| bool SuspendedRegAccessTest() { |
| BEGIN_TEST; |
| |
| zx_handle_t self_proc = zx_process_self(); |
| |
| thrd_t thread_c11; |
| suspended_reg_access_arg arg = {}; |
| arg.initial_value = reg_access_initial_value; |
| zx_handle_t channel; |
| tu_channel_create(&channel, &arg.channel); |
| tu_thread_create_c11(&thread_c11, reg_access_thread_func, &arg, "reg-access thread"); |
| // Get our own copy of the thread handle to avoid lifetime issues of |
| // thrd's copy. |
| zx_handle_t thread = tu_handle_duplicate(thrd_get_zx_handle(thread_c11)); |
| |
| // KISS: Don't attach until the thread is up and running so we don't see |
| // ZX_EXCP_THREAD_STARTING. |
| enum message msg; |
| recv_msg(channel, &msg); |
| // No need to send a ping. |
| ASSERT_EQ(msg, MSG_PONG); |
| |
| // Set up waiting for the thread to suspend via a port (since this is |
| // what debuggers will typically do). |
| zx_handle_t eport = tu_io_port_create(); |
| zx_signals_t signals = ZX_THREAD_TERMINATED | ZX_THREAD_RUNNING | ZX_THREAD_SUSPENDED; |
| tu_object_wait_async(thread, eport, signals); |
| |
| // Keep looping until we know the thread is stopped in the assembler. |
| // This is the only place we can guarantee particular registers have |
| // particular values. |
| zx_handle_t suspend_token = ZX_HANDLE_INVALID; |
| zx_thread_state_general_regs_t regs; |
| uint64_t test_reg = 0; |
| while (true) { |
| zx_nanosleep(zx_deadline_after(ZX_USEC(1))); |
| ASSERT_EQ(zx_task_suspend_token(thread, &suspend_token), ZX_OK); |
| ASSERT_TRUE(wait_thread_suspended(self_proc, thread, eport)); |
| |
| read_inferior_gregs(thread, ®s); |
| test_reg = regs.REG_ACCESS_TEST_REG; |
| |
| if (test_reg == reg_access_initial_value) |
| break; // Keep thread suspended. |
| |
| // Resume and try again. |
| zx_handle_close(suspend_token); |
| } |
| |
| uint64_t pc_value = extract_pc_reg(®s); |
| uint64_t sp_value = extract_sp_reg(®s); |
| regs.REG_ACCESS_TEST_REG = reg_access_write_test_value; |
| write_inferior_gregs(thread, ®s); |
| |
| ASSERT_EQ(zx_handle_close(suspend_token), ZX_OK); |
| thrd_join(thread_c11, NULL); |
| tu_handle_close(thread); |
| |
| // We can't test the pc value exactly as we don't know on which instruction |
| // the thread will be suspended. But we can verify it is within some |
| // minimal range. |
| EXPECT_GE(pc_value, arg.pc); |
| EXPECT_LE(pc_value, arg.pc + REG_ACCESS_MAX_LOOP_SIZE); |
| |
| EXPECT_EQ(sp_value, arg.sp); |
| |
| EXPECT_EQ(reg_access_write_test_value, arg.result); |
| |
| tu_handle_close(channel); |
| tu_handle_close(eport); |
| END_TEST; |
| } |
| |
| struct suspended_in_syscall_reg_access_arg { |
| bool do_channel_call; |
| zx_handle_t syscall_handle; |
| std::atomic<uintptr_t> sp; |
| }; |
| |
| // "zx_channel_call treats the leading bytes of the payload as |
| // a transaction id of type zx_txid_t" |
| static_assert(sizeof(zx_txid_t) == sizeof(uint32_t), ""); |
| #define CHANNEL_CALL_PACKET_SIZE (sizeof(zx_txid_t) + sizeof("x")) |
| |
| int suspended_in_syscall_reg_access_thread_func(void* arg_) { |
| suspended_in_syscall_reg_access_arg* arg = |
| static_cast<suspended_in_syscall_reg_access_arg*>(arg_); |
| |
| uint64_t sp; |
| #ifdef __x86_64__ |
| __asm__("\ |
| mov %%rsp, %[sp]" |
| : [sp] "=r"(sp)); |
| #endif |
| #ifdef __aarch64__ |
| __asm__("\ |
| mov %[sp], sp" |
| : [sp] "=r"(sp)); |
| #endif |
| arg->sp.store(sp); |
| |
| if (arg->do_channel_call) { |
| uint8_t send_buf[CHANNEL_CALL_PACKET_SIZE] = "TXIDx"; |
| uint8_t recv_buf[CHANNEL_CALL_PACKET_SIZE]; |
| uint32_t actual_bytes, actual_handles; |
| zx_channel_call_args_t call_args = { |
| .wr_bytes = send_buf, |
| .wr_handles = NULL, |
| .rd_bytes = recv_buf, |
| .rd_handles = NULL, |
| .wr_num_bytes = sizeof(send_buf), |
| .wr_num_handles = 0, |
| .rd_num_bytes = sizeof(recv_buf), |
| .rd_num_handles = 0, |
| }; |
| zx_status_t call_status = zx_channel_call(arg->syscall_handle, 0, ZX_TIME_INFINITE, |
| &call_args, &actual_bytes, &actual_handles); |
| ASSERT_EQ(call_status, ZX_OK); |
| EXPECT_EQ(actual_bytes, sizeof(recv_buf)); |
| EXPECT_EQ(memcmp(recv_buf + sizeof(zx_txid_t), "y", sizeof(recv_buf) - sizeof(zx_txid_t)), 0); |
| } else { |
| zx_signals_t pending; |
| zx_status_t status = |
| zx_object_wait_one(arg->syscall_handle, ZX_EVENT_SIGNALED, ZX_TIME_INFINITE, &pending); |
| ASSERT_EQ(status, ZX_OK); |
| EXPECT_NE(pending & ZX_EVENT_SIGNALED, 0u); |
| } |
| |
| return 0; |
| } |
| |
| // Channel calls are a little special in that they are a two part syscall, |
| // with suspension possible in between the two parts. |
| // If |do_channel_call| is true, test zx_channel_call. Otherwise test some |
| // random syscall that can block, here we use zx_object_wait_one. |
| // |
| // The syscall entry point is the vdso, there's no bypassing this for test |
| // purposes. Also, the kernel doesn't save userspace regs on entry, it only |
| // saves them later if it needs to - at which point many don't necessarily |
| // have any useful value. Putting these together means we can't easily test |
| // random integer registers: there's no guarantee any value we set in the test |
| // will be available when the syscall is suspended. All is not lost, we can |
| // still at least test that reading $pc, $sp work. |
| |
| bool suspended_in_syscall_reg_access_worker(bool do_channel_call) { |
| zx_handle_t self_proc = zx_process_self(); |
| |
| uintptr_t vdso_start = 0, vdso_end = 0; |
| EXPECT_TRUE(get_vdso_exec_range(&vdso_start, &vdso_end)); |
| |
| suspended_in_syscall_reg_access_arg arg = {}; |
| arg.do_channel_call = do_channel_call; |
| |
| zx_handle_t syscall_handle; |
| if (do_channel_call) { |
| tu_channel_create(&arg.syscall_handle, &syscall_handle); |
| } else { |
| ASSERT_EQ(zx_event_create(0u, &syscall_handle), ZX_OK); |
| arg.syscall_handle = syscall_handle; |
| } |
| |
| thrd_t thread_c11; |
| tu_thread_create_c11(&thread_c11, suspended_in_syscall_reg_access_thread_func, &arg, |
| "reg-access thread"); |
| // Get our own copy of the thread handle to avoid lifetime issues of |
| // thrd's copy. |
| zx_handle_t thread = tu_handle_duplicate(thrd_get_zx_handle(thread_c11)); |
| |
| // Busy-wait until thread is blocked inside the syscall. |
| zx_info_thread_t thread_info; |
| uint32_t expected_blocked_reason = |
| do_channel_call ? ZX_THREAD_STATE_BLOCKED_CHANNEL : ZX_THREAD_STATE_BLOCKED_WAIT_ONE; |
| do { |
| // Don't check too frequently here as it can blow up tracing output |
| // when debugging with kernel tracing turned on. |
| zx_nanosleep(zx_deadline_after(ZX_USEC(100))); |
| thread_info = tu_thread_get_info(thread); |
| } while (thread_info.state != expected_blocked_reason); |
| ASSERT_EQ(thread_info.wait_exception_port_type, ZX_EXCEPTION_PORT_TYPE_NONE); |
| |
| // Extra sanity check for channels. |
| if (do_channel_call) { |
| EXPECT_TRUE(tu_channel_wait_readable(syscall_handle)); |
| } |
| |
| // Set up waiting for the thread to suspend via a port (since this is |
| // what debuggers will typically do). |
| zx_handle_t eport = tu_io_port_create(); |
| zx_signals_t signals = ZX_THREAD_TERMINATED | ZX_THREAD_RUNNING | ZX_THREAD_SUSPENDED; |
| tu_object_wait_async(thread, eport, signals); |
| |
| zx_handle_t token; |
| ASSERT_EQ(zx_task_suspend_token(thread, &token), ZX_OK); |
| |
| ASSERT_TRUE(wait_thread_suspended(self_proc, thread, eport)); |
| |
| zx_thread_state_general_regs_t regs; |
| read_inferior_gregs(thread, ®s); |
| |
| // Verify the pc is somewhere within the vdso. |
| uint64_t pc_value = extract_pc_reg(®s); |
| EXPECT_GE(pc_value, vdso_start); |
| EXPECT_LE(pc_value, vdso_end); |
| |
| // The stack pointer is somewhere within the syscall. |
| // Just verify the value we have is within range. |
| uint64_t sp_value = extract_sp_reg(®s); |
| uint64_t arg_sp = arg.sp.load(); |
| EXPECT_LE(sp_value, arg_sp); |
| EXPECT_GE(sp_value + 1024, arg_sp); |
| |
| // wake the thread |
| if (do_channel_call) { |
| uint8_t buf[CHANNEL_CALL_PACKET_SIZE]; |
| uint32_t actual_bytes; |
| ASSERT_EQ( |
| zx_channel_read(syscall_handle, 0, buf, NULL, sizeof(buf), 0, &actual_bytes, NULL), |
| ZX_OK); |
| EXPECT_EQ(actual_bytes, sizeof(buf)); |
| EXPECT_EQ(memcmp(buf + sizeof(zx_txid_t), "x", sizeof(buf) - sizeof(zx_txid_t)), 0); |
| |
| // write a reply |
| buf[sizeof(zx_txid_t)] = 'y'; |
| ASSERT_EQ(zx_channel_write(syscall_handle, 0, buf, sizeof(buf), NULL, 0), ZX_OK); |
| |
| // Make sure the remote channel didn't get signaled |
| EXPECT_EQ(zx_object_wait_one(arg.syscall_handle, ZX_CHANNEL_READABLE, 0, NULL), |
| ZX_ERR_TIMED_OUT); |
| |
| // Make sure we can't read from the remote channel (the message should have |
| // been reserved for the other thread, even though it is suspended). |
| EXPECT_EQ( |
| zx_channel_read(arg.syscall_handle, 0, buf, NULL, sizeof(buf), 0, &actual_bytes, NULL), |
| ZX_ERR_SHOULD_WAIT); |
| } else { |
| ASSERT_EQ(zx_object_signal(syscall_handle, 0u, ZX_EVENT_SIGNALED), ZX_OK); |
| } |
| |
| ASSERT_EQ(zx_handle_close(token), ZX_OK); |
| thrd_join(thread_c11, NULL); |
| tu_handle_close(thread); |
| |
| tu_handle_close(eport); |
| if (do_channel_call) { |
| tu_handle_close(arg.syscall_handle); |
| } |
| tu_handle_close(syscall_handle); |
| |
| return true; |
| } |
| |
| bool SuspendedInSyscallRegAccessTest() { |
| BEGIN_TEST; |
| |
| EXPECT_TRUE(suspended_in_syscall_reg_access_worker(false)); |
| |
| END_TEST; |
| } |
| |
| bool SuspendedInChannelCallRegAccessTest() { |
| BEGIN_TEST; |
| |
| EXPECT_TRUE(suspended_in_syscall_reg_access_worker(true)); |
| |
| END_TEST; |
| } |
| |
| struct suspend_in_exception_data { |
| std::atomic<int> segv_count; |
| std::atomic<int> suspend_count; |
| std::atomic<int> resume_count; |
| zx_handle_t thread_handle; |
| zx_handle_t suspend_token; |
| zx_koid_t process_id; |
| zx_koid_t thread_id; |
| }; |
| |
| // N.B. This runs on the wait-inferior thread. |
| |
| bool suspended_in_exception_handler(zx_handle_t inferior, zx_handle_t port, |
| const zx_port_packet_t* packet, void* handler_arg) { |
| BEGIN_HELPER; |
| |
| suspend_in_exception_data* data = static_cast<suspend_in_exception_data*>(handler_arg); |
| |
| if (ZX_PKT_IS_SIGNAL_REP(packet->type)) { |
| // Must be a signal on one of the threads. |
| ASSERT_TRUE(packet->key != data->process_id); |
| zx_koid_t pkt_tid = packet->key; |
| |
| // The following signals are expected here. Note that |
| // ZX_THREAD_RUNNING and ZX_THREAD_TERMINATED can be reported |
| // together in the same zx_port_packet_t. |
| if (packet->signal.observed & ZX_THREAD_TERMINATED) { |
| // Nothing to do. |
| } |
| if (packet->signal.observed & ZX_THREAD_RUNNING) { |
| ASSERT_EQ(pkt_tid, data->thread_id); |
| atomic_fetch_add(&data->resume_count, 1); |
| } |
| if (packet->signal.observed & ZX_THREAD_SUSPENDED) { |
| ASSERT_EQ(pkt_tid, data->thread_id); |
| atomic_fetch_add(&data->suspend_count, 1); |
| ASSERT_EQ(zx_handle_close(data->suspend_token), ZX_OK); |
| // At this point we should get ZX_THREAD_RUNNING, we'll |
| // process it later. |
| } |
| } else { |
| ASSERT_TRUE(ZX_PKT_IS_EXCEPTION(packet->type)); |
| |
| zx_koid_t pkt_tid = packet->exception.tid; |
| |
| switch (packet->type) { |
| case ZX_EXCP_THREAD_EXITING: |
| // N.B. We could get thread exiting messages from previous |
| // tests. |
| EXPECT_TRUE(handle_thread_exiting(inferior, port, packet)); |
| break; |
| |
| case ZX_EXCP_FATAL_PAGE_FAULT: { |
| unittest_printf("wait-inf: got page fault exception\n"); |
| |
| ASSERT_EQ(pkt_tid, data->thread_id); |
| |
| // Verify that the fault is at the PC we expected. |
| if (!TestSegvPc(data->thread_handle)) |
| return false; |
| |
| // Suspend the thread before fixing the segv to verify register |
| // access works while the thread is in an exception and suspended. |
| ASSERT_EQ(zx_task_suspend_token(data->thread_handle, &data->suspend_token), ZX_OK); |
| |
| // Waiting for the thread to suspend doesn't work here as the |
| // thread stays in the exception until we pass ZX_RESUME_EXCEPTION. |
| // Just give the scheduler a chance to run the thread and process |
| // the ZX_ERR_INTERNAL_INTR_RETRY in ExceptionHandlerExchange. |
| zx_nanosleep(zx_deadline_after(ZX_MSEC(1))); |
| |
| // Do some tests that require a suspended inferior. |
| // This is required as the inferior does tests after it wakes up |
| // that assumes we've done this. |
| test_memory_ops(inferior, data->thread_handle); |
| |
| // Now correct the issue and resume the inferior. |
| fix_inferior_segv(data->thread_handle); |
| |
| atomic_fetch_add(&data->segv_count, 1); |
| |
| ASSERT_EQ(zx_task_resume_from_exception(data->thread_handle, port, 0), ZX_OK); |
| // At this point we should get ZX_THREAD_SUSPENDED, we'll |
| // process it later. |
| |
| break; |
| } |
| |
| default: { |
| char msg[128]; |
| snprintf(msg, sizeof(msg), "unexpected packet type: 0x%x", packet->type); |
| ASSERT_TRUE(false, msg); |
| __UNREACHABLE; |
| } |
| } |
| } |
| |
| END_HELPER; |
| } |
| |
| bool SuspendedInExceptionRegAccessTest() { |
| BEGIN_TEST; |
| |
| launchpad_t* lp; |
| zx_handle_t inferior, channel; |
| if (!setup_inferior(kTestInferiorChildName, &lp, &inferior, &channel)) |
| return false; |
| |
| if (!start_inferior(lp)) |
| return false; |
| if (!verify_inferior_running(channel)) |
| return false; |
| |
| suspend_in_exception_data data; |
| data.segv_count.store(0); |
| data.suspend_count.store(0); |
| data.resume_count.store(0); |
| ASSERT_TRUE(get_inferior_thread_handle(channel, &data.thread_handle)); |
| data.process_id = tu_get_koid(inferior); |
| data.thread_id = tu_get_koid(data.thread_handle); |
| |
| // Defer attaching until after the inferior is running to test |
| // attach_inferior's recording of existing threads. If that fails |
| // it won't see thread suspended/running messages from the thread. |
| zx_handle_t eport = tu_io_port_create(); |
| size_t max_threads = 10; |
| inferior_data_t* inferior_data = attach_inferior(inferior, eport, max_threads); |
| thrd_t wait_inf_thread = |
| start_wait_inf_thread(inferior_data, suspended_in_exception_handler, &data); |
| EXPECT_NE(eport, ZX_HANDLE_INVALID); |
| |
| enum message msg; |
| send_msg(channel, MSG_CRASH_AND_RECOVER_TEST); |
| if (!recv_msg(channel, &msg)) { |
| return false; |
| } |
| // wait_inf_thread will process the crash and resume the inferior. |
| EXPECT_EQ(msg, MSG_RECOVERED_FROM_CRASH); |
| |
| if (!shutdown_inferior(channel, inferior)) |
| return false; |
| |
| // Stop the waiter thread before closing the eport that it's waiting on. |
| join_wait_inf_thread(wait_inf_thread); |
| |
| detach_inferior(inferior_data, true); |
| |
| // Don't check these until now to ensure the resume_count has been |
| // updated (we're guaranteed that ZX_THREAD_RUNNING will be signalled |
| // and processed before the waiter thread exits. |
| EXPECT_EQ(data.segv_count.load(), kNumSegvTries); |
| EXPECT_EQ(data.suspend_count.load(), kNumSegvTries); |
| // There's an initial "RUNNING" signal that the handler will see. |
| // That is why we add one here. |
| EXPECT_EQ(data.resume_count.load(), kNumSegvTries + 1); |
| |
| tu_handle_close(data.thread_handle); |
| tu_handle_close(eport); |
| tu_handle_close(channel); |
| tu_handle_close(inferior); |
| |
| END_TEST; |
| } |
| |
| // This function is marked as no-inline to avoid duplicate label in case the |
| // function call is being inlined. |
| __NO_INLINE static bool TestPrepAndSegv() { |
| uint8_t test_data[kTestMemorySize]; |
| for (unsigned i = 0; i < sizeof(test_data); ++i) |
| test_data[i] = static_cast<uint8_t>(i); |
| |
| #ifdef __x86_64__ |
| void* segv_pc; |
| // Note: Fuchsia is always PIC. |
| __asm__("leaq .Lsegv_here(%%rip),%0" : "=r"(segv_pc)); |
| unittest_printf("About to segv, pc %p\n", segv_pc); |
| |
| // Set r9 to point to test_data so we can easily access it |
| // from the parent process. Likewise set r10 to segv_pc |
| // so the parent process can verify it matches the fault PC. |
| __asm__("\ |
| movq %[zero],%%r8\n\ |
| movq %[test_data],%%r9\n\ |
| movq %[pc],%%r10\n\ |
| .Lsegv_here:\n\ |
| movq (%%r8),%%rax\ |
| " |
| : |
| : [zero] "g"(0), [test_data] "g"(&test_data[0]), [pc] "g"(segv_pc) |
| : "rax", "r8", "r9", "r10"); |
| #endif |
| |
| #ifdef __aarch64__ |
| void* segv_pc; |
| // Note: Fuchsia is always PIC. |
| __asm__("adrp %0, .Lsegv_here\n" |
| "add %0, %0, :lo12:.Lsegv_here" |
| : "=r"(segv_pc)); |
| unittest_printf("About to segv, pc %p\n", segv_pc); |
| |
| // Set r9 to point to test_data so we can easily access it |
| // from the parent process. Likewise set r10 to segv_pc |
| // so the parent process can verify it matches the fault PC. |
| __asm__("\ |
| mov x8,xzr\n\ |
| mov x9,%[test_data]\n\ |
| mov x10,%[pc]\n\ |
| .Lsegv_here:\n\ |
| ldr x0,[x8]\ |
| " |
| : |
| : [test_data] "r"(&test_data[0]), [pc] "r"(segv_pc) |
| : "x0", "x8", "x9", "x10"); |
| #endif |
| |
| // On resumption test_data should have had kTestDataAdjust added to each element. |
| // Note: This is the inferior process, it's not running under the test harness. |
| for (unsigned i = 0; i < sizeof(test_data); ++i) { |
| if (test_data[i] != i + kTestDataAdjust) { |
| unittest_printf("TestPrepAndSegv: bad data on resumption, test_data[%u] = 0x%x\n", i, |
| test_data[i]); |
| return false; |
| } |
| } |
| |
| unittest_printf("Inferior successfully resumed!\n"); |
| |
| return true; |
| } |
| |
| int extra_thread_func(void* arg) { |
| atomic_fetch_add(&extra_thread_count, 1); |
| unittest_printf("Extra thread started.\n"); |
| while (true) |
| zx_nanosleep(zx_deadline_after(ZX_SEC(1))); |
| return 0; |
| } |
| |
| // This returns a bool as it's a unittest "helper" routine. |
| |
| bool msg_loop(zx_handle_t channel) { |
| BEGIN_HELPER; // Don't stomp on the main thread's current_test_info. |
| |
| bool my_done_tests = false; |
| |
| while (!my_done_tests) { |
| enum message msg; |
| ASSERT_TRUE(recv_msg(channel, &msg), "Error while receiving msg"); |
| switch (msg) { |
| case MSG_DONE: |
| my_done_tests = true; |
| break; |
| case MSG_PING: |
| send_msg(channel, MSG_PONG); |
| break; |
| case MSG_CRASH_AND_RECOVER_TEST: |
| for (int i = 0; i < kNumSegvTries; ++i) { |
| if (!TestPrepAndSegv()) |
| exit(21); |
| } |
| send_msg(channel, MSG_RECOVERED_FROM_CRASH); |
| break; |
| case MSG_START_EXTRA_THREADS: |
| for (int i = 0; i < kNumExtraThreads; ++i) { |
| // For our purposes, we don't need to track the threads. |
| // They'll be terminated when the process exits. |
| thrd_t thread; |
| tu_thread_create_c11(&thread, extra_thread_func, NULL, "extra-thread"); |
| } |
| // Wait for all threads to be started. |
| // Each will require an ZX_EXCP_THREAD_STARTING exchange with the "debugger". |
| while (extra_thread_count.load() < kNumExtraThreads) |
| zx_nanosleep(zx_deadline_after(ZX_USEC(1))); |
| send_msg(channel, MSG_EXTRA_THREADS_STARTED); |
| break; |
| case MSG_GET_THREAD_HANDLE: { |
| zx_handle_t self = zx_thread_self(); |
| zx_handle_t copy; |
| zx_handle_duplicate(self, ZX_RIGHT_SAME_RIGHTS, ©); |
| // Note: The handle is transferred to the receiver. |
| uint64_t data = MSG_THREAD_HANDLE; |
| unittest_printf("sending handle %d message on channel %u\n", copy, channel); |
| tu_channel_write(channel, 0, &data, sizeof(data), ©, 1); |
| break; |
| } |
| default: |
| unittest_printf("unknown message received: %d\n", msg); |
| break; |
| } |
| } |
| |
| END_HELPER; |
| } |
| |
| void test_inferior() { |
| zx_handle_t channel = zx_take_startup_handle(PA_USER0); |
| unittest_printf("test_inferior: got handle %d\n", channel); |
| |
| if (!msg_loop(channel)) |
| exit(20); |
| |
| unittest_printf("Inferior done\n"); |
| exit(1234); |
| } |
| |
| // Compilers are getting too smart. |
| // These maintain the semantics we want even under optimization. |
| |
| volatile int* crashing_ptr = (int*)42; |
| volatile int crash_depth; |
| |
| // This is used to cause fp != sp when the crash happens on arm64. |
| int leaf_stack_size = 10; |
| |
| int __NO_INLINE test_segfault_doit2(int*); |
| |
| int __NO_INLINE test_segfault_leaf(int n, int* p) { |
| volatile int x[n]; |
| x[0] = *p; |
| *crashing_ptr = x[0]; |
| return 0; |
| } |
| |
| int __NO_INLINE test_segfault_doit1(int* p) { |
| if (crash_depth > 0) { |
| int n = crash_depth; |
| int use_stack[n]; |
| memset(use_stack, 0x99, n * sizeof(int)); |
| --crash_depth; |
| return test_segfault_doit2(use_stack) + 99; |
| } |
| return test_segfault_leaf(leaf_stack_size, p) + 99; |
| } |
| |
| int __NO_INLINE test_segfault_doit2(int* p) { |
| return test_segfault_doit1(p) + *p; |
| } |
| |
| // Produce a crash with a moderately interesting backtrace. |
| int __NO_INLINE test_segfault() { |
| crash_depth = kTestSegfaultDepth; |
| int i = 0; |
| return test_segfault_doit1(&i); |
| } |
| |
| // Invoke the s/w breakpoint insn using the crashlogger mechanism |
| // to request a backtrace but not terminate the process. |
| int __NO_INLINE test_swbreak() { |
| unittest_printf("Invoking s/w breakpoint instruction\n"); |
| backtrace_request(); |
| unittest_printf("Resumed after s/w breakpoint instruction\n"); |
| return 0; |
| } |
| |
| void scan_argv(int argc, char** argv) { |
| for (int i = 1; i < argc; ++i) { |
| if (strncmp(argv[i], "v=", 2) == 0) { |
| int verbosity = atoi(argv[i] + 2); |
| unittest_set_verbosity_level(verbosity); |
| } |
| } |
| } |
| |
| } // namespace |
| |
| BEGIN_TEST_CASE(debugger_tests) |
| RUN_TEST(DebuggerTest) |
| RUN_TEST(DebuggerThreadListTest) |
| RUN_TEST(PropertyProcessDebugAddrTest) |
| RUN_TEST(WriteTextSegment) |
| RUN_TEST(SuspendedRegAccessTest) |
| RUN_TEST(SuspendedInSyscallRegAccessTest) |
| RUN_TEST(SuspendedInChannelCallRegAccessTest) |
| RUN_TEST(SuspendedInExceptionRegAccessTest) |
| END_TEST_CASE(debugger_tests) |
| |
| int main(int argc, char** argv) { |
| program_path = argv[0]; |
| scan_argv(argc, argv); |
| |
| if (argc >= 2 && strcmp(argv[1], kTestInferiorChildName) == 0) { |
| test_inferior(); |
| return 0; |
| } |
| if (argc >= 2 && strcmp(argv[1], kTestSegfaultChildName) == 0) { |
| return test_segfault(); |
| } |
| if (argc >= 2 && strcmp(argv[1], kTestSwbreakChildName) == 0) { |
| return test_swbreak(); |
| } |
| |
| bool success = unittest_run_all_tests(argc, argv); |
| return success ? 0 : -1; |
| } |
