| //===-- ProcessMonitor.cpp ------------------------------------ -*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "lldb/lldb-python.h" |
| |
| // C Includes |
| #include <errno.h> |
| #include <poll.h> |
| #include <string.h> |
| #include <stdint.h> |
| #include <unistd.h> |
| #include <sys/ptrace.h> |
| #include <sys/socket.h> |
| #include <sys/types.h> |
| #include <sys/wait.h> |
| |
| // C++ Includes |
| // Other libraries and framework includes |
| #include "lldb/Core/Debugger.h" |
| #include "lldb/Core/Error.h" |
| #include "lldb/Core/RegisterValue.h" |
| #include "lldb/Core/Scalar.h" |
| #include "lldb/Host/Host.h" |
| #include "lldb/Target/Thread.h" |
| #include "lldb/Target/RegisterContext.h" |
| #include "lldb/Utility/PseudoTerminal.h" |
| |
| #include "POSIXThread.h" |
| #include "ProcessLinux.h" |
| #include "ProcessPOSIXLog.h" |
| #include "ProcessMonitor.h" |
| |
| |
| #define DEBUG_PTRACE_MAXBYTES 20 |
| |
| // Support ptrace extensions even when compiled without required kernel support |
| #ifndef PTRACE_GETREGSET |
| #define PTRACE_GETREGSET 0x4204 |
| #endif |
| #ifndef PTRACE_SETREGSET |
| #define PTRACE_SETREGSET 0x4205 |
| #endif |
| |
| // Support hardware breakpoints in case it has not been defined |
| #ifndef TRAP_HWBKPT |
| #define TRAP_HWBKPT 4 |
| #endif |
| |
| using namespace lldb_private; |
| |
| // FIXME: this code is host-dependent with respect to types and |
| // endianness and needs to be fixed. For example, lldb::addr_t is |
| // hard-coded to uint64_t, but on a 32-bit Linux host, ptrace requires |
| // 32-bit pointer arguments. This code uses casts to work around the |
| // problem. |
| |
| // We disable the tracing of ptrace calls for integration builds to |
| // avoid the additional indirection and checks. |
| #ifndef LLDB_CONFIGURATION_BUILDANDINTEGRATION |
| |
| static void |
| DisplayBytes (lldb_private::StreamString &s, void *bytes, uint32_t count) |
| { |
| uint8_t *ptr = (uint8_t *)bytes; |
| const uint32_t loop_count = std::min<uint32_t>(DEBUG_PTRACE_MAXBYTES, count); |
| for(uint32_t i=0; i<loop_count; i++) |
| { |
| s.Printf ("[%x]", *ptr); |
| ptr++; |
| } |
| } |
| |
| static void PtraceDisplayBytes(int &req, void *data, size_t data_size) |
| { |
| StreamString buf; |
| Log *verbose_log (ProcessPOSIXLog::GetLogIfAllCategoriesSet ( |
| POSIX_LOG_PTRACE | POSIX_LOG_VERBOSE)); |
| |
| if (verbose_log) |
| { |
| switch(req) |
| { |
| case PTRACE_POKETEXT: |
| { |
| DisplayBytes(buf, &data, 8); |
| verbose_log->Printf("PTRACE_POKETEXT %s", buf.GetData()); |
| break; |
| } |
| case PTRACE_POKEDATA: |
| { |
| DisplayBytes(buf, &data, 8); |
| verbose_log->Printf("PTRACE_POKEDATA %s", buf.GetData()); |
| break; |
| } |
| case PTRACE_POKEUSER: |
| { |
| DisplayBytes(buf, &data, 8); |
| verbose_log->Printf("PTRACE_POKEUSER %s", buf.GetData()); |
| break; |
| } |
| case PTRACE_SETREGS: |
| { |
| DisplayBytes(buf, data, data_size); |
| verbose_log->Printf("PTRACE_SETREGS %s", buf.GetData()); |
| break; |
| } |
| case PTRACE_SETFPREGS: |
| { |
| DisplayBytes(buf, data, data_size); |
| verbose_log->Printf("PTRACE_SETFPREGS %s", buf.GetData()); |
| break; |
| } |
| case PTRACE_SETSIGINFO: |
| { |
| DisplayBytes(buf, data, sizeof(siginfo_t)); |
| verbose_log->Printf("PTRACE_SETSIGINFO %s", buf.GetData()); |
| break; |
| } |
| case PTRACE_SETREGSET: |
| { |
| // Extract iov_base from data, which is a pointer to the struct IOVEC |
| DisplayBytes(buf, *(void **)data, data_size); |
| verbose_log->Printf("PTRACE_SETREGSET %s", buf.GetData()); |
| break; |
| } |
| default: |
| { |
| } |
| } |
| } |
| } |
| |
| // Wrapper for ptrace to catch errors and log calls. |
| // Note that ptrace sets errno on error because -1 can be a valid result (i.e. for PTRACE_PEEK*) |
| extern long |
| PtraceWrapper(int req, lldb::pid_t pid, void *addr, void *data, size_t data_size, |
| const char* reqName, const char* file, int line) |
| { |
| long int result; |
| |
| Log *log (ProcessPOSIXLog::GetLogIfAllCategoriesSet (POSIX_LOG_PTRACE)); |
| |
| if (log) |
| log->Printf("ptrace(%s, %lu, %p, %p, %zu) called from file %s line %d", |
| reqName, pid, addr, data, data_size, file, line); |
| |
| PtraceDisplayBytes(req, data, data_size); |
| |
| errno = 0; |
| if (req == PTRACE_GETREGSET || req == PTRACE_SETREGSET) |
| result = ptrace(static_cast<__ptrace_request>(req), pid, *(unsigned int *)addr, data); |
| else |
| result = ptrace(static_cast<__ptrace_request>(req), pid, addr, data); |
| |
| PtraceDisplayBytes(req, data, data_size); |
| |
| if (log && errno != 0) |
| { |
| const char* str; |
| switch (errno) |
| { |
| case ESRCH: str = "ESRCH"; break; |
| case EINVAL: str = "EINVAL"; break; |
| case EBUSY: str = "EBUSY"; break; |
| case EPERM: str = "EPERM"; break; |
| default: str = "<unknown>"; |
| } |
| log->Printf("ptrace() failed; errno=%d (%s)", errno, str); |
| } |
| |
| return result; |
| } |
| |
| // Wrapper for ptrace when logging is not required. |
| // Sets errno to 0 prior to calling ptrace. |
| extern long |
| PtraceWrapper(int req, pid_t pid, void *addr, void *data, size_t data_size) |
| { |
| long result = 0; |
| errno = 0; |
| if (req == PTRACE_GETREGSET || req == PTRACE_SETREGSET) |
| result = ptrace(static_cast<__ptrace_request>(req), pid, *(unsigned int *)addr, data); |
| else |
| result = ptrace(static_cast<__ptrace_request>(req), pid, addr, data); |
| return result; |
| } |
| |
| #define PTRACE(req, pid, addr, data, data_size) \ |
| PtraceWrapper((req), (pid), (addr), (data), (data_size), #req, __FILE__, __LINE__) |
| #else |
| PtraceWrapper((req), (pid), (addr), (data), (data_size)) |
| #endif |
| |
| //------------------------------------------------------------------------------ |
| // Static implementations of ProcessMonitor::ReadMemory and |
| // ProcessMonitor::WriteMemory. This enables mutual recursion between these |
| // functions without needed to go thru the thread funnel. |
| |
| static size_t |
| DoReadMemory(lldb::pid_t pid, |
| lldb::addr_t vm_addr, void *buf, size_t size, Error &error) |
| { |
| // ptrace word size is determined by the host, not the child |
| static const unsigned word_size = sizeof(void*); |
| unsigned char *dst = static_cast<unsigned char*>(buf); |
| size_t bytes_read; |
| size_t remainder; |
| long data; |
| |
| Log *log (ProcessPOSIXLog::GetLogIfAllCategoriesSet (POSIX_LOG_ALL)); |
| if (log) |
| ProcessPOSIXLog::IncNestLevel(); |
| if (log && ProcessPOSIXLog::AtTopNestLevel() && log->GetMask().Test(POSIX_LOG_MEMORY)) |
| log->Printf ("ProcessMonitor::%s(%" PRIu64 ", %d, %p, %p, %zd, _)", __FUNCTION__, |
| pid, word_size, (void*)vm_addr, buf, size); |
| |
| assert(sizeof(data) >= word_size); |
| for (bytes_read = 0; bytes_read < size; bytes_read += remainder) |
| { |
| errno = 0; |
| data = PTRACE(PTRACE_PEEKDATA, pid, (void*)vm_addr, NULL, 0); |
| if (errno) |
| { |
| error.SetErrorToErrno(); |
| if (log) |
| ProcessPOSIXLog::DecNestLevel(); |
| return bytes_read; |
| } |
| |
| remainder = size - bytes_read; |
| remainder = remainder > word_size ? word_size : remainder; |
| |
| // Copy the data into our buffer |
| for (unsigned i = 0; i < remainder; ++i) |
| dst[i] = ((data >> i*8) & 0xFF); |
| |
| if (log && ProcessPOSIXLog::AtTopNestLevel() && |
| (log->GetMask().Test(POSIX_LOG_MEMORY_DATA_LONG) || |
| (log->GetMask().Test(POSIX_LOG_MEMORY_DATA_SHORT) && |
| size <= POSIX_LOG_MEMORY_SHORT_BYTES))) |
| { |
| uintptr_t print_dst = 0; |
| // Format bytes from data by moving into print_dst for log output |
| for (unsigned i = 0; i < remainder; ++i) |
| print_dst |= (((data >> i*8) & 0xFF) << i*8); |
| log->Printf ("ProcessMonitor::%s() [%p]:0x%lx (0x%lx)", __FUNCTION__, |
| (void*)vm_addr, print_dst, (unsigned long)data); |
| } |
| |
| vm_addr += word_size; |
| dst += word_size; |
| } |
| |
| if (log) |
| ProcessPOSIXLog::DecNestLevel(); |
| return bytes_read; |
| } |
| |
| static size_t |
| DoWriteMemory(lldb::pid_t pid, |
| lldb::addr_t vm_addr, const void *buf, size_t size, Error &error) |
| { |
| // ptrace word size is determined by the host, not the child |
| static const unsigned word_size = sizeof(void*); |
| const unsigned char *src = static_cast<const unsigned char*>(buf); |
| size_t bytes_written = 0; |
| size_t remainder; |
| |
| Log *log (ProcessPOSIXLog::GetLogIfAllCategoriesSet (POSIX_LOG_ALL)); |
| if (log) |
| ProcessPOSIXLog::IncNestLevel(); |
| if (log && ProcessPOSIXLog::AtTopNestLevel() && log->GetMask().Test(POSIX_LOG_MEMORY)) |
| log->Printf ("ProcessMonitor::%s(%" PRIu64 ", %d, %p, %p, %zd, _)", __FUNCTION__, |
| pid, word_size, (void*)vm_addr, buf, size); |
| |
| for (bytes_written = 0; bytes_written < size; bytes_written += remainder) |
| { |
| remainder = size - bytes_written; |
| remainder = remainder > word_size ? word_size : remainder; |
| |
| if (remainder == word_size) |
| { |
| unsigned long data = 0; |
| assert(sizeof(data) >= word_size); |
| for (unsigned i = 0; i < word_size; ++i) |
| data |= (unsigned long)src[i] << i*8; |
| |
| if (log && ProcessPOSIXLog::AtTopNestLevel() && |
| (log->GetMask().Test(POSIX_LOG_MEMORY_DATA_LONG) || |
| (log->GetMask().Test(POSIX_LOG_MEMORY_DATA_SHORT) && |
| size <= POSIX_LOG_MEMORY_SHORT_BYTES))) |
| log->Printf ("ProcessMonitor::%s() [%p]:0x%lx (0x%lx)", __FUNCTION__, |
| (void*)vm_addr, *(unsigned long*)src, data); |
| |
| if (PTRACE(PTRACE_POKEDATA, pid, (void*)vm_addr, (void*)data, 0)) |
| { |
| error.SetErrorToErrno(); |
| if (log) |
| ProcessPOSIXLog::DecNestLevel(); |
| return bytes_written; |
| } |
| } |
| else |
| { |
| unsigned char buff[8]; |
| if (DoReadMemory(pid, vm_addr, |
| buff, word_size, error) != word_size) |
| { |
| if (log) |
| ProcessPOSIXLog::DecNestLevel(); |
| return bytes_written; |
| } |
| |
| memcpy(buff, src, remainder); |
| |
| if (DoWriteMemory(pid, vm_addr, |
| buff, word_size, error) != word_size) |
| { |
| if (log) |
| ProcessPOSIXLog::DecNestLevel(); |
| return bytes_written; |
| } |
| |
| if (log && ProcessPOSIXLog::AtTopNestLevel() && |
| (log->GetMask().Test(POSIX_LOG_MEMORY_DATA_LONG) || |
| (log->GetMask().Test(POSIX_LOG_MEMORY_DATA_SHORT) && |
| size <= POSIX_LOG_MEMORY_SHORT_BYTES))) |
| log->Printf ("ProcessMonitor::%s() [%p]:0x%lx (0x%lx)", __FUNCTION__, |
| (void*)vm_addr, *(unsigned long*)src, *(unsigned long*)buff); |
| } |
| |
| vm_addr += word_size; |
| src += word_size; |
| } |
| if (log) |
| ProcessPOSIXLog::DecNestLevel(); |
| return bytes_written; |
| } |
| |
| // Simple helper function to ensure flags are enabled on the given file |
| // descriptor. |
| static bool |
| EnsureFDFlags(int fd, int flags, Error &error) |
| { |
| int status; |
| |
| if ((status = fcntl(fd, F_GETFL)) == -1) |
| { |
| error.SetErrorToErrno(); |
| return false; |
| } |
| |
| if (fcntl(fd, F_SETFL, status | flags) == -1) |
| { |
| error.SetErrorToErrno(); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| //------------------------------------------------------------------------------ |
| /// @class Operation |
| /// @brief Represents a ProcessMonitor operation. |
| /// |
| /// Under Linux, it is not possible to ptrace() from any other thread but the |
| /// one that spawned or attached to the process from the start. Therefore, when |
| /// a ProcessMonitor is asked to deliver or change the state of an inferior |
| /// process the operation must be "funneled" to a specific thread to perform the |
| /// task. The Operation class provides an abstract base for all services the |
| /// ProcessMonitor must perform via the single virtual function Execute, thus |
| /// encapsulating the code that needs to run in the privileged context. |
| class Operation |
| { |
| public: |
| virtual ~Operation() {} |
| virtual void Execute(ProcessMonitor *monitor) = 0; |
| }; |
| |
| //------------------------------------------------------------------------------ |
| /// @class ReadOperation |
| /// @brief Implements ProcessMonitor::ReadMemory. |
| class ReadOperation : public Operation |
| { |
| public: |
| ReadOperation(lldb::addr_t addr, void *buff, size_t size, |
| Error &error, size_t &result) |
| : m_addr(addr), m_buff(buff), m_size(size), |
| m_error(error), m_result(result) |
| { } |
| |
| void Execute(ProcessMonitor *monitor); |
| |
| private: |
| lldb::addr_t m_addr; |
| void *m_buff; |
| size_t m_size; |
| Error &m_error; |
| size_t &m_result; |
| }; |
| |
| void |
| ReadOperation::Execute(ProcessMonitor *monitor) |
| { |
| lldb::pid_t pid = monitor->GetPID(); |
| |
| m_result = DoReadMemory(pid, m_addr, m_buff, m_size, m_error); |
| } |
| |
| //------------------------------------------------------------------------------ |
| /// @class ReadOperation |
| /// @brief Implements ProcessMonitor::WriteMemory. |
| class WriteOperation : public Operation |
| { |
| public: |
| WriteOperation(lldb::addr_t addr, const void *buff, size_t size, |
| Error &error, size_t &result) |
| : m_addr(addr), m_buff(buff), m_size(size), |
| m_error(error), m_result(result) |
| { } |
| |
| void Execute(ProcessMonitor *monitor); |
| |
| private: |
| lldb::addr_t m_addr; |
| const void *m_buff; |
| size_t m_size; |
| Error &m_error; |
| size_t &m_result; |
| }; |
| |
| void |
| WriteOperation::Execute(ProcessMonitor *monitor) |
| { |
| lldb::pid_t pid = monitor->GetPID(); |
| |
| m_result = DoWriteMemory(pid, m_addr, m_buff, m_size, m_error); |
| } |
| |
| |
| //------------------------------------------------------------------------------ |
| /// @class ReadRegOperation |
| /// @brief Implements ProcessMonitor::ReadRegisterValue. |
| class ReadRegOperation : public Operation |
| { |
| public: |
| ReadRegOperation(lldb::tid_t tid, unsigned offset, const char *reg_name, |
| RegisterValue &value, bool &result) |
| : m_tid(tid), m_offset(offset), m_reg_name(reg_name), |
| m_value(value), m_result(result) |
| { } |
| |
| void Execute(ProcessMonitor *monitor); |
| |
| private: |
| lldb::tid_t m_tid; |
| uintptr_t m_offset; |
| const char *m_reg_name; |
| RegisterValue &m_value; |
| bool &m_result; |
| }; |
| |
| void |
| ReadRegOperation::Execute(ProcessMonitor *monitor) |
| { |
| Log *log (ProcessPOSIXLog::GetLogIfAllCategoriesSet (POSIX_LOG_REGISTERS)); |
| |
| // Set errno to zero so that we can detect a failed peek. |
| errno = 0; |
| lldb::addr_t data = PTRACE(PTRACE_PEEKUSER, m_tid, (void*)m_offset, NULL, 0); |
| if (errno) |
| m_result = false; |
| else |
| { |
| m_value = data; |
| m_result = true; |
| } |
| if (log) |
| log->Printf ("ProcessMonitor::%s() reg %s: 0x%" PRIx64, __FUNCTION__, |
| m_reg_name, data); |
| } |
| |
| //------------------------------------------------------------------------------ |
| /// @class WriteRegOperation |
| /// @brief Implements ProcessMonitor::WriteRegisterValue. |
| class WriteRegOperation : public Operation |
| { |
| public: |
| WriteRegOperation(lldb::tid_t tid, unsigned offset, const char *reg_name, |
| const RegisterValue &value, bool &result) |
| : m_tid(tid), m_offset(offset), m_reg_name(reg_name), |
| m_value(value), m_result(result) |
| { } |
| |
| void Execute(ProcessMonitor *monitor); |
| |
| private: |
| lldb::tid_t m_tid; |
| uintptr_t m_offset; |
| const char *m_reg_name; |
| const RegisterValue &m_value; |
| bool &m_result; |
| }; |
| |
| void |
| WriteRegOperation::Execute(ProcessMonitor *monitor) |
| { |
| void* buf; |
| Log *log (ProcessPOSIXLog::GetLogIfAllCategoriesSet (POSIX_LOG_REGISTERS)); |
| |
| #if __WORDSIZE == 32 |
| buf = (void*) m_value.GetAsUInt32(); |
| #else |
| buf = (void*) m_value.GetAsUInt64(); |
| #endif |
| |
| if (log) |
| log->Printf ("ProcessMonitor::%s() reg %s: %p", __FUNCTION__, m_reg_name, buf); |
| if (PTRACE(PTRACE_POKEUSER, m_tid, (void*)m_offset, buf, 0)) |
| m_result = false; |
| else |
| m_result = true; |
| } |
| |
| //------------------------------------------------------------------------------ |
| /// @class ReadGPROperation |
| /// @brief Implements ProcessMonitor::ReadGPR. |
| class ReadGPROperation : public Operation |
| { |
| public: |
| ReadGPROperation(lldb::tid_t tid, void *buf, size_t buf_size, bool &result) |
| : m_tid(tid), m_buf(buf), m_buf_size(buf_size), m_result(result) |
| { } |
| |
| void Execute(ProcessMonitor *monitor); |
| |
| private: |
| lldb::tid_t m_tid; |
| void *m_buf; |
| size_t m_buf_size; |
| bool &m_result; |
| }; |
| |
| void |
| ReadGPROperation::Execute(ProcessMonitor *monitor) |
| { |
| if (PTRACE(PTRACE_GETREGS, m_tid, NULL, m_buf, m_buf_size) < 0) |
| m_result = false; |
| else |
| m_result = true; |
| } |
| |
| //------------------------------------------------------------------------------ |
| /// @class ReadFPROperation |
| /// @brief Implements ProcessMonitor::ReadFPR. |
| class ReadFPROperation : public Operation |
| { |
| public: |
| ReadFPROperation(lldb::tid_t tid, void *buf, size_t buf_size, bool &result) |
| : m_tid(tid), m_buf(buf), m_buf_size(buf_size), m_result(result) |
| { } |
| |
| void Execute(ProcessMonitor *monitor); |
| |
| private: |
| lldb::tid_t m_tid; |
| void *m_buf; |
| size_t m_buf_size; |
| bool &m_result; |
| }; |
| |
| void |
| ReadFPROperation::Execute(ProcessMonitor *monitor) |
| { |
| if (PTRACE(PTRACE_GETFPREGS, m_tid, NULL, m_buf, m_buf_size) < 0) |
| m_result = false; |
| else |
| m_result = true; |
| } |
| |
| //------------------------------------------------------------------------------ |
| /// @class ReadRegisterSetOperation |
| /// @brief Implements ProcessMonitor::ReadRegisterSet. |
| class ReadRegisterSetOperation : public Operation |
| { |
| public: |
| ReadRegisterSetOperation(lldb::tid_t tid, void *buf, size_t buf_size, unsigned int regset, bool &result) |
| : m_tid(tid), m_buf(buf), m_buf_size(buf_size), m_regset(regset), m_result(result) |
| { } |
| |
| void Execute(ProcessMonitor *monitor); |
| |
| private: |
| lldb::tid_t m_tid; |
| void *m_buf; |
| size_t m_buf_size; |
| const unsigned int m_regset; |
| bool &m_result; |
| }; |
| |
| void |
| ReadRegisterSetOperation::Execute(ProcessMonitor *monitor) |
| { |
| if (PTRACE(PTRACE_GETREGSET, m_tid, (void *)&m_regset, m_buf, m_buf_size) < 0) |
| m_result = false; |
| else |
| m_result = true; |
| } |
| |
| //------------------------------------------------------------------------------ |
| /// @class WriteGPROperation |
| /// @brief Implements ProcessMonitor::WriteGPR. |
| class WriteGPROperation : public Operation |
| { |
| public: |
| WriteGPROperation(lldb::tid_t tid, void *buf, size_t buf_size, bool &result) |
| : m_tid(tid), m_buf(buf), m_buf_size(buf_size), m_result(result) |
| { } |
| |
| void Execute(ProcessMonitor *monitor); |
| |
| private: |
| lldb::tid_t m_tid; |
| void *m_buf; |
| size_t m_buf_size; |
| bool &m_result; |
| }; |
| |
| void |
| WriteGPROperation::Execute(ProcessMonitor *monitor) |
| { |
| if (PTRACE(PTRACE_SETREGS, m_tid, NULL, m_buf, m_buf_size) < 0) |
| m_result = false; |
| else |
| m_result = true; |
| } |
| |
| //------------------------------------------------------------------------------ |
| /// @class WriteFPROperation |
| /// @brief Implements ProcessMonitor::WriteFPR. |
| class WriteFPROperation : public Operation |
| { |
| public: |
| WriteFPROperation(lldb::tid_t tid, void *buf, size_t buf_size, bool &result) |
| : m_tid(tid), m_buf(buf), m_buf_size(buf_size), m_result(result) |
| { } |
| |
| void Execute(ProcessMonitor *monitor); |
| |
| private: |
| lldb::tid_t m_tid; |
| void *m_buf; |
| size_t m_buf_size; |
| bool &m_result; |
| }; |
| |
| void |
| WriteFPROperation::Execute(ProcessMonitor *monitor) |
| { |
| if (PTRACE(PTRACE_SETFPREGS, m_tid, NULL, m_buf, m_buf_size) < 0) |
| m_result = false; |
| else |
| m_result = true; |
| } |
| |
| //------------------------------------------------------------------------------ |
| /// @class WriteRegisterSetOperation |
| /// @brief Implements ProcessMonitor::WriteRegisterSet. |
| class WriteRegisterSetOperation : public Operation |
| { |
| public: |
| WriteRegisterSetOperation(lldb::tid_t tid, void *buf, size_t buf_size, unsigned int regset, bool &result) |
| : m_tid(tid), m_buf(buf), m_buf_size(buf_size), m_regset(regset), m_result(result) |
| { } |
| |
| void Execute(ProcessMonitor *monitor); |
| |
| private: |
| lldb::tid_t m_tid; |
| void *m_buf; |
| size_t m_buf_size; |
| const unsigned int m_regset; |
| bool &m_result; |
| }; |
| |
| void |
| WriteRegisterSetOperation::Execute(ProcessMonitor *monitor) |
| { |
| if (PTRACE(PTRACE_SETREGSET, m_tid, (void *)&m_regset, m_buf, m_buf_size) < 0) |
| m_result = false; |
| else |
| m_result = true; |
| } |
| |
| //------------------------------------------------------------------------------ |
| /// @class ResumeOperation |
| /// @brief Implements ProcessMonitor::Resume. |
| class ResumeOperation : public Operation |
| { |
| public: |
| ResumeOperation(lldb::tid_t tid, uint32_t signo, bool &result) : |
| m_tid(tid), m_signo(signo), m_result(result) { } |
| |
| void Execute(ProcessMonitor *monitor); |
| |
| private: |
| lldb::tid_t m_tid; |
| uint32_t m_signo; |
| bool &m_result; |
| }; |
| |
| void |
| ResumeOperation::Execute(ProcessMonitor *monitor) |
| { |
| intptr_t data = 0; |
| |
| if (m_signo != LLDB_INVALID_SIGNAL_NUMBER) |
| data = m_signo; |
| |
| if (PTRACE(PTRACE_CONT, m_tid, NULL, (void*)data, 0)) |
| m_result = false; |
| else |
| m_result = true; |
| } |
| |
| //------------------------------------------------------------------------------ |
| /// @class ResumeOperation |
| /// @brief Implements ProcessMonitor::SingleStep. |
| class SingleStepOperation : public Operation |
| { |
| public: |
| SingleStepOperation(lldb::tid_t tid, uint32_t signo, bool &result) |
| : m_tid(tid), m_signo(signo), m_result(result) { } |
| |
| void Execute(ProcessMonitor *monitor); |
| |
| private: |
| lldb::tid_t m_tid; |
| uint32_t m_signo; |
| bool &m_result; |
| }; |
| |
| void |
| SingleStepOperation::Execute(ProcessMonitor *monitor) |
| { |
| intptr_t data = 0; |
| |
| if (m_signo != LLDB_INVALID_SIGNAL_NUMBER) |
| data = m_signo; |
| |
| if (PTRACE(PTRACE_SINGLESTEP, m_tid, NULL, (void*)data, 0)) |
| m_result = false; |
| else |
| m_result = true; |
| } |
| |
| //------------------------------------------------------------------------------ |
| /// @class SiginfoOperation |
| /// @brief Implements ProcessMonitor::GetSignalInfo. |
| class SiginfoOperation : public Operation |
| { |
| public: |
| SiginfoOperation(lldb::tid_t tid, void *info, bool &result, int &ptrace_err) |
| : m_tid(tid), m_info(info), m_result(result), m_err(ptrace_err) { } |
| |
| void Execute(ProcessMonitor *monitor); |
| |
| private: |
| lldb::tid_t m_tid; |
| void *m_info; |
| bool &m_result; |
| int &m_err; |
| }; |
| |
| void |
| SiginfoOperation::Execute(ProcessMonitor *monitor) |
| { |
| if (PTRACE(PTRACE_GETSIGINFO, m_tid, NULL, m_info, 0)) { |
| m_result = false; |
| m_err = errno; |
| } |
| else |
| m_result = true; |
| } |
| |
| //------------------------------------------------------------------------------ |
| /// @class EventMessageOperation |
| /// @brief Implements ProcessMonitor::GetEventMessage. |
| class EventMessageOperation : public Operation |
| { |
| public: |
| EventMessageOperation(lldb::tid_t tid, unsigned long *message, bool &result) |
| : m_tid(tid), m_message(message), m_result(result) { } |
| |
| void Execute(ProcessMonitor *monitor); |
| |
| private: |
| lldb::tid_t m_tid; |
| unsigned long *m_message; |
| bool &m_result; |
| }; |
| |
| void |
| EventMessageOperation::Execute(ProcessMonitor *monitor) |
| { |
| if (PTRACE(PTRACE_GETEVENTMSG, m_tid, NULL, m_message, 0)) |
| m_result = false; |
| else |
| m_result = true; |
| } |
| |
| //------------------------------------------------------------------------------ |
| /// @class KillOperation |
| /// @brief Implements ProcessMonitor::BringProcessIntoLimbo. |
| class KillOperation : public Operation |
| { |
| public: |
| KillOperation(bool &result) : m_result(result) { } |
| |
| void Execute(ProcessMonitor *monitor); |
| |
| private: |
| bool &m_result; |
| }; |
| |
| void |
| KillOperation::Execute(ProcessMonitor *monitor) |
| { |
| lldb::pid_t pid = monitor->GetPID(); |
| |
| if (PTRACE(PTRACE_KILL, pid, NULL, NULL, 0)) |
| m_result = false; |
| else |
| m_result = true; |
| } |
| |
| //------------------------------------------------------------------------------ |
| /// @class KillOperation |
| /// @brief Implements ProcessMonitor::BringProcessIntoLimbo. |
| class DetachOperation : public Operation |
| { |
| public: |
| DetachOperation(Error &result) : m_error(result) { } |
| |
| void Execute(ProcessMonitor *monitor); |
| |
| private: |
| Error &m_error; |
| }; |
| |
| void |
| DetachOperation::Execute(ProcessMonitor *monitor) |
| { |
| lldb::pid_t pid = monitor->GetPID(); |
| |
| if (ptrace(PT_DETACH, pid, NULL, 0) < 0) |
| m_error.SetErrorToErrno(); |
| |
| } |
| |
| ProcessMonitor::OperationArgs::OperationArgs(ProcessMonitor *monitor) |
| : m_monitor(monitor) |
| { |
| sem_init(&m_semaphore, 0, 0); |
| } |
| |
| ProcessMonitor::OperationArgs::~OperationArgs() |
| { |
| sem_destroy(&m_semaphore); |
| } |
| |
| ProcessMonitor::LaunchArgs::LaunchArgs(ProcessMonitor *monitor, |
| lldb_private::Module *module, |
| char const **argv, |
| char const **envp, |
| const char *stdin_path, |
| const char *stdout_path, |
| const char *stderr_path, |
| const char *working_dir) |
| : OperationArgs(monitor), |
| m_module(module), |
| m_argv(argv), |
| m_envp(envp), |
| m_stdin_path(stdin_path), |
| m_stdout_path(stdout_path), |
| m_stderr_path(stderr_path), |
| m_working_dir(working_dir) { } |
| |
| ProcessMonitor::LaunchArgs::~LaunchArgs() |
| { } |
| |
| ProcessMonitor::AttachArgs::AttachArgs(ProcessMonitor *monitor, |
| lldb::pid_t pid) |
| : OperationArgs(monitor), m_pid(pid) { } |
| |
| ProcessMonitor::AttachArgs::~AttachArgs() |
| { } |
| |
| //------------------------------------------------------------------------------ |
| /// The basic design of the ProcessMonitor is built around two threads. |
| /// |
| /// One thread (@see SignalThread) simply blocks on a call to waitpid() looking |
| /// for changes in the debugee state. When a change is detected a |
| /// ProcessMessage is sent to the associated ProcessLinux instance. This thread |
| /// "drives" state changes in the debugger. |
| /// |
| /// The second thread (@see OperationThread) is responsible for two things 1) |
| /// launching or attaching to the inferior process, and then 2) servicing |
| /// operations such as register reads/writes, stepping, etc. See the comments |
| /// on the Operation class for more info as to why this is needed. |
| ProcessMonitor::ProcessMonitor(ProcessPOSIX *process, |
| Module *module, |
| const char *argv[], |
| const char *envp[], |
| const char *stdin_path, |
| const char *stdout_path, |
| const char *stderr_path, |
| const char *working_dir, |
| lldb_private::Error &error) |
| : m_process(static_cast<ProcessLinux *>(process)), |
| m_operation_thread(LLDB_INVALID_HOST_THREAD), |
| m_monitor_thread(LLDB_INVALID_HOST_THREAD), |
| m_pid(LLDB_INVALID_PROCESS_ID), |
| m_terminal_fd(-1), |
| m_client_fd(-1), |
| m_server_fd(-1) |
| { |
| std::unique_ptr<LaunchArgs> args; |
| |
| args.reset(new LaunchArgs(this, module, argv, envp, |
| stdin_path, stdout_path, stderr_path, working_dir)); |
| |
| // Server/client descriptors. |
| if (!EnableIPC()) |
| { |
| error.SetErrorToGenericError(); |
| error.SetErrorString("Monitor failed to initialize."); |
| } |
| |
| StartLaunchOpThread(args.get(), error); |
| if (!error.Success()) |
| return; |
| |
| WAIT_AGAIN: |
| // Wait for the operation thread to initialize. |
| if (sem_wait(&args->m_semaphore)) |
| { |
| if (errno == EINTR) |
| goto WAIT_AGAIN; |
| else |
| { |
| error.SetErrorToErrno(); |
| return; |
| } |
| } |
| |
| // Check that the launch was a success. |
| if (!args->m_error.Success()) |
| { |
| StopOpThread(); |
| error = args->m_error; |
| return; |
| } |
| |
| // Finally, start monitoring the child process for change in state. |
| m_monitor_thread = Host::StartMonitoringChildProcess( |
| ProcessMonitor::MonitorCallback, this, GetPID(), true); |
| if (!IS_VALID_LLDB_HOST_THREAD(m_monitor_thread)) |
| { |
| error.SetErrorToGenericError(); |
| error.SetErrorString("Process launch failed."); |
| return; |
| } |
| } |
| |
| ProcessMonitor::ProcessMonitor(ProcessPOSIX *process, |
| lldb::pid_t pid, |
| lldb_private::Error &error) |
| : m_process(static_cast<ProcessLinux *>(process)), |
| m_operation_thread(LLDB_INVALID_HOST_THREAD), |
| m_monitor_thread(LLDB_INVALID_HOST_THREAD), |
| m_pid(LLDB_INVALID_PROCESS_ID), |
| m_terminal_fd(-1), |
| |
| m_client_fd(-1), |
| m_server_fd(-1) |
| { |
| std::unique_ptr<AttachArgs> args; |
| |
| args.reset(new AttachArgs(this, pid)); |
| |
| // Server/client descriptors. |
| if (!EnableIPC()) |
| { |
| error.SetErrorToGenericError(); |
| error.SetErrorString("Monitor failed to initialize."); |
| } |
| |
| StartAttachOpThread(args.get(), error); |
| if (!error.Success()) |
| return; |
| |
| WAIT_AGAIN: |
| // Wait for the operation thread to initialize. |
| if (sem_wait(&args->m_semaphore)) |
| { |
| if (errno == EINTR) |
| goto WAIT_AGAIN; |
| else |
| { |
| error.SetErrorToErrno(); |
| return; |
| } |
| } |
| |
| // Check that the attach was a success. |
| if (!args->m_error.Success()) |
| { |
| StopOpThread(); |
| error = args->m_error; |
| return; |
| } |
| |
| // Finally, start monitoring the child process for change in state. |
| m_monitor_thread = Host::StartMonitoringChildProcess( |
| ProcessMonitor::MonitorCallback, this, GetPID(), true); |
| if (!IS_VALID_LLDB_HOST_THREAD(m_monitor_thread)) |
| { |
| error.SetErrorToGenericError(); |
| error.SetErrorString("Process attach failed."); |
| return; |
| } |
| } |
| |
| ProcessMonitor::~ProcessMonitor() |
| { |
| StopMonitor(); |
| } |
| |
| //------------------------------------------------------------------------------ |
| // Thread setup and tear down. |
| void |
| ProcessMonitor::StartLaunchOpThread(LaunchArgs *args, Error &error) |
| { |
| static const char *g_thread_name = "lldb.process.linux.operation"; |
| |
| if (IS_VALID_LLDB_HOST_THREAD(m_operation_thread)) |
| return; |
| |
| m_operation_thread = |
| Host::ThreadCreate(g_thread_name, LaunchOpThread, args, &error); |
| } |
| |
| void * |
| ProcessMonitor::LaunchOpThread(void *arg) |
| { |
| LaunchArgs *args = static_cast<LaunchArgs*>(arg); |
| |
| if (!Launch(args)) { |
| sem_post(&args->m_semaphore); |
| return NULL; |
| } |
| |
| ServeOperation(args); |
| return NULL; |
| } |
| |
| bool |
| ProcessMonitor::Launch(LaunchArgs *args) |
| { |
| ProcessMonitor *monitor = args->m_monitor; |
| ProcessLinux &process = monitor->GetProcess(); |
| const char **argv = args->m_argv; |
| const char **envp = args->m_envp; |
| const char *stdin_path = args->m_stdin_path; |
| const char *stdout_path = args->m_stdout_path; |
| const char *stderr_path = args->m_stderr_path; |
| const char *working_dir = args->m_working_dir; |
| |
| lldb_utility::PseudoTerminal terminal; |
| const size_t err_len = 1024; |
| char err_str[err_len]; |
| lldb::pid_t pid; |
| long ptrace_opts = 0; |
| |
| lldb::ThreadSP inferior; |
| Log *log (ProcessPOSIXLog::GetLogIfAllCategoriesSet (POSIX_LOG_PROCESS)); |
| |
| // Propagate the environment if one is not supplied. |
| if (envp == NULL || envp[0] == NULL) |
| envp = const_cast<const char **>(environ); |
| |
| // Pseudo terminal setup. |
| if (!terminal.OpenFirstAvailableMaster(O_RDWR | O_NOCTTY, err_str, err_len)) |
| { |
| args->m_error.SetErrorToGenericError(); |
| args->m_error.SetErrorString("Could not open controlling TTY."); |
| goto FINISH; |
| } |
| |
| if ((pid = terminal.Fork(err_str, err_len)) == -1) |
| { |
| args->m_error.SetErrorToGenericError(); |
| args->m_error.SetErrorString("Process fork failed."); |
| goto FINISH; |
| } |
| |
| // Recognized child exit status codes. |
| enum { |
| ePtraceFailed = 1, |
| eDupStdinFailed, |
| eDupStdoutFailed, |
| eDupStderrFailed, |
| eChdirFailed, |
| eExecFailed |
| }; |
| |
| // Child process. |
| if (pid == 0) |
| { |
| // Trace this process. |
| if (PTRACE(PTRACE_TRACEME, 0, NULL, NULL, 0) < 0) |
| exit(ePtraceFailed); |
| |
| // Do not inherit setgid powers. |
| setgid(getgid()); |
| |
| // Let us have our own process group. |
| setpgid(0, 0); |
| |
| // Dup file descriptors if needed. |
| // |
| // FIXME: If two or more of the paths are the same we needlessly open |
| // the same file multiple times. |
| if (stdin_path != NULL && stdin_path[0]) |
| if (!DupDescriptor(stdin_path, STDIN_FILENO, O_RDONLY)) |
| exit(eDupStdinFailed); |
| |
| if (stdout_path != NULL && stdout_path[0]) |
| if (!DupDescriptor(stdout_path, STDOUT_FILENO, O_WRONLY | O_CREAT)) |
| exit(eDupStdoutFailed); |
| |
| if (stderr_path != NULL && stderr_path[0]) |
| if (!DupDescriptor(stderr_path, STDERR_FILENO, O_WRONLY | O_CREAT)) |
| exit(eDupStderrFailed); |
| |
| // Change working directory |
| if (working_dir != NULL && working_dir[0]) |
| if (0 != ::chdir(working_dir)) |
| exit(eChdirFailed); |
| |
| // Execute. We should never return. |
| execve(argv[0], |
| const_cast<char *const *>(argv), |
| const_cast<char *const *>(envp)); |
| exit(eExecFailed); |
| } |
| |
| // Wait for the child process to to trap on its call to execve. |
| pid_t wpid; |
| int status; |
| if ((wpid = waitpid(pid, &status, 0)) < 0) |
| { |
| args->m_error.SetErrorToErrno(); |
| goto FINISH; |
| } |
| else if (WIFEXITED(status)) |
| { |
| // open, dup or execve likely failed for some reason. |
| args->m_error.SetErrorToGenericError(); |
| switch (WEXITSTATUS(status)) |
| { |
| case ePtraceFailed: |
| args->m_error.SetErrorString("Child ptrace failed."); |
| break; |
| case eDupStdinFailed: |
| args->m_error.SetErrorString("Child open stdin failed."); |
| break; |
| case eDupStdoutFailed: |
| args->m_error.SetErrorString("Child open stdout failed."); |
| break; |
| case eDupStderrFailed: |
| args->m_error.SetErrorString("Child open stderr failed."); |
| break; |
| case eChdirFailed: |
| args->m_error.SetErrorString("Child failed to set working directory."); |
| break; |
| case eExecFailed: |
| args->m_error.SetErrorString("Child exec failed."); |
| break; |
| default: |
| args->m_error.SetErrorString("Child returned unknown exit status."); |
| break; |
| } |
| goto FINISH; |
| } |
| assert(WIFSTOPPED(status) && wpid == pid && |
| "Could not sync with inferior process."); |
| |
| // Have the child raise an event on exit. This is used to keep the child in |
| // limbo until it is destroyed. |
| ptrace_opts |= PTRACE_O_TRACEEXIT; |
| |
| // Have the tracer trace threads which spawn in the inferior process. |
| ptrace_opts |= PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORK | PTRACE_O_TRACECLONE; |
| |
| if (PTRACE(PTRACE_SETOPTIONS, pid, NULL, (void*)ptrace_opts, 0) < 0) |
| { |
| args->m_error.SetErrorToErrno(); |
| goto FINISH; |
| } |
| |
| // Release the master terminal descriptor and pass it off to the |
| // ProcessMonitor instance. Similarly stash the inferior pid. |
| monitor->m_terminal_fd = terminal.ReleaseMasterFileDescriptor(); |
| monitor->m_pid = pid; |
| |
| // Set the terminal fd to be in non blocking mode (it simplifies the |
| // implementation of ProcessLinux::GetSTDOUT to have a non-blocking |
| // descriptor to read from). |
| if (!EnsureFDFlags(monitor->m_terminal_fd, O_NONBLOCK, args->m_error)) |
| goto FINISH; |
| |
| // Update the process thread list with this new thread. |
| // FIXME: should we be letting UpdateThreadList handle this? |
| // FIXME: by using pids instead of tids, we can only support one thread. |
| inferior.reset(new POSIXThread(process, pid)); |
| if (log) |
| log->Printf ("ProcessMonitor::%s() adding pid = %" PRIu64, __FUNCTION__, pid); |
| process.GetThreadList().AddThread(inferior); |
| |
| // Let our process instance know the thread has stopped. |
| process.SendMessage(ProcessMessage::Trace(pid)); |
| |
| FINISH: |
| return args->m_error.Success(); |
| } |
| |
| bool |
| ProcessMonitor::EnableIPC() |
| { |
| int fd[2]; |
| |
| if (socketpair(AF_UNIX, SOCK_STREAM, 0, fd)) |
| return false; |
| |
| m_client_fd = fd[0]; |
| m_server_fd = fd[1]; |
| return true; |
| } |
| |
| void |
| ProcessMonitor::StartAttachOpThread(AttachArgs *args, lldb_private::Error &error) |
| { |
| static const char *g_thread_name = "lldb.process.linux.operation"; |
| |
| if (IS_VALID_LLDB_HOST_THREAD(m_operation_thread)) |
| return; |
| |
| m_operation_thread = |
| Host::ThreadCreate(g_thread_name, AttachOpThread, args, &error); |
| } |
| |
| void * |
| ProcessMonitor::AttachOpThread(void *arg) |
| { |
| AttachArgs *args = static_cast<AttachArgs*>(arg); |
| |
| if (!Attach(args)) { |
| sem_post(&args->m_semaphore); |
| return NULL; |
| } |
| |
| ServeOperation(args); |
| return NULL; |
| } |
| |
| bool |
| ProcessMonitor::Attach(AttachArgs *args) |
| { |
| lldb::pid_t pid = args->m_pid; |
| |
| ProcessMonitor *monitor = args->m_monitor; |
| ProcessLinux &process = monitor->GetProcess(); |
| lldb::ThreadSP inferior; |
| Log *log (ProcessPOSIXLog::GetLogIfAllCategoriesSet (POSIX_LOG_PROCESS)); |
| |
| if (pid <= 1) |
| { |
| args->m_error.SetErrorToGenericError(); |
| args->m_error.SetErrorString("Attaching to process 1 is not allowed."); |
| goto FINISH; |
| } |
| |
| // Attach to the requested process. |
| if (PTRACE(PTRACE_ATTACH, pid, NULL, NULL, 0) < 0) |
| { |
| args->m_error.SetErrorToErrno(); |
| goto FINISH; |
| } |
| |
| int status; |
| if ((status = waitpid(pid, NULL, 0)) < 0) |
| { |
| args->m_error.SetErrorToErrno(); |
| goto FINISH; |
| } |
| |
| monitor->m_pid = pid; |
| |
| // Update the process thread list with the attached thread. |
| inferior.reset(new POSIXThread(process, pid)); |
| if (log) |
| log->Printf ("ProcessMonitor::%s() adding tid = %" PRIu64, __FUNCTION__, pid); |
| process.GetThreadList().AddThread(inferior); |
| |
| // Let our process instance know the thread has stopped. |
| process.SendMessage(ProcessMessage::Trace(pid)); |
| |
| FINISH: |
| return args->m_error.Success(); |
| } |
| |
| bool |
| ProcessMonitor::MonitorCallback(void *callback_baton, |
| lldb::pid_t pid, |
| bool exited, |
| int signal, |
| int status) |
| { |
| ProcessMessage message; |
| ProcessMonitor *monitor = static_cast<ProcessMonitor*>(callback_baton); |
| ProcessLinux *process = monitor->m_process; |
| assert(process); |
| bool stop_monitoring; |
| siginfo_t info; |
| int ptrace_err; |
| |
| if (!monitor->GetSignalInfo(pid, &info, ptrace_err)) { |
| if (ptrace_err == EINVAL) { |
| // inferior process is in 'group-stop', so deliver SIGSTOP signal |
| if (!monitor->Resume(pid, SIGSTOP)) { |
| assert(0 && "SIGSTOP delivery failed while in 'group-stop' state"); |
| } |
| stop_monitoring = false; |
| } else { |
| // ptrace(GETSIGINFO) failed (but not due to group-stop). Most likely, |
| // this means the child pid is gone (or not being debugged) therefore |
| // stop the monitor thread. |
| stop_monitoring = true; |
| } |
| } |
| else { |
| switch (info.si_signo) |
| { |
| case SIGTRAP: |
| message = MonitorSIGTRAP(monitor, &info, pid); |
| break; |
| |
| default: |
| message = MonitorSignal(monitor, &info, pid); |
| break; |
| } |
| |
| process->SendMessage(message); |
| stop_monitoring = !process->IsAlive(); |
| } |
| |
| return stop_monitoring; |
| } |
| |
| ProcessMessage |
| ProcessMonitor::MonitorSIGTRAP(ProcessMonitor *monitor, |
| const siginfo_t *info, lldb::pid_t pid) |
| { |
| ProcessMessage message; |
| |
| assert(monitor); |
| assert(info && info->si_signo == SIGTRAP && "Unexpected child signal!"); |
| |
| switch (info->si_code) |
| { |
| default: |
| assert(false && "Unexpected SIGTRAP code!"); |
| break; |
| |
| case (SIGTRAP | (PTRACE_EVENT_FORK << 8)): |
| case (SIGTRAP | (PTRACE_EVENT_VFORK << 8)): |
| case (SIGTRAP | (PTRACE_EVENT_CLONE << 8)): |
| { |
| unsigned long tid = 0; |
| if (!monitor->GetEventMessage(pid, &tid)) |
| tid = -1; |
| message = ProcessMessage::NewThread(pid, tid); |
| break; |
| } |
| |
| case (SIGTRAP | (PTRACE_EVENT_EXIT << 8)): |
| { |
| // The inferior process is about to exit. Maintain the process in a |
| // state of "limbo" until we are explicitly commanded to detach, |
| // destroy, resume, etc. |
| unsigned long data = 0; |
| if (!monitor->GetEventMessage(pid, &data)) |
| data = -1; |
| message = ProcessMessage::Limbo(pid, (data >> 8)); |
| break; |
| } |
| |
| case 0: |
| case TRAP_TRACE: |
| message = ProcessMessage::Trace(pid); |
| break; |
| |
| case SI_KERNEL: |
| case TRAP_BRKPT: |
| message = ProcessMessage::Break(pid); |
| break; |
| |
| case TRAP_HWBKPT: |
| message = ProcessMessage::Watch(pid, (lldb::addr_t)info->si_addr); |
| break; |
| } |
| |
| return message; |
| } |
| |
| ProcessMessage |
| ProcessMonitor::MonitorSignal(ProcessMonitor *monitor, |
| const siginfo_t *info, lldb::pid_t pid) |
| { |
| ProcessMessage message; |
| int signo = info->si_signo; |
| |
| // POSIX says that process behaviour is undefined after it ignores a SIGFPE, |
| // SIGILL, SIGSEGV, or SIGBUS *unless* that signal was generated by a |
| // kill(2) or raise(3). Similarly for tgkill(2) on Linux. |
| // |
| // IOW, user generated signals never generate what we consider to be a |
| // "crash". |
| // |
| // Similarly, ACK signals generated by this monitor. |
| if (info->si_code == SI_TKILL || info->si_code == SI_USER) |
| { |
| if (info->si_pid == getpid()) |
| return ProcessMessage::SignalDelivered(pid, signo); |
| else |
| return ProcessMessage::Signal(pid, signo); |
| } |
| |
| if (signo == SIGSEGV) { |
| lldb::addr_t fault_addr = reinterpret_cast<lldb::addr_t>(info->si_addr); |
| ProcessMessage::CrashReason reason = GetCrashReasonForSIGSEGV(info); |
| return ProcessMessage::Crash(pid, reason, signo, fault_addr); |
| } |
| |
| if (signo == SIGILL) { |
| lldb::addr_t fault_addr = reinterpret_cast<lldb::addr_t>(info->si_addr); |
| ProcessMessage::CrashReason reason = GetCrashReasonForSIGILL(info); |
| return ProcessMessage::Crash(pid, reason, signo, fault_addr); |
| } |
| |
| if (signo == SIGFPE) { |
| lldb::addr_t fault_addr = reinterpret_cast<lldb::addr_t>(info->si_addr); |
| ProcessMessage::CrashReason reason = GetCrashReasonForSIGFPE(info); |
| return ProcessMessage::Crash(pid, reason, signo, fault_addr); |
| } |
| |
| if (signo == SIGBUS) { |
| lldb::addr_t fault_addr = reinterpret_cast<lldb::addr_t>(info->si_addr); |
| ProcessMessage::CrashReason reason = GetCrashReasonForSIGBUS(info); |
| return ProcessMessage::Crash(pid, reason, signo, fault_addr); |
| } |
| |
| // Everything else is "normal" and does not require any special action on |
| // our part. |
| return ProcessMessage::Signal(pid, signo); |
| } |
| |
| ProcessMessage::CrashReason |
| ProcessMonitor::GetCrashReasonForSIGSEGV(const siginfo_t *info) |
| { |
| ProcessMessage::CrashReason reason; |
| assert(info->si_signo == SIGSEGV); |
| |
| reason = ProcessMessage::eInvalidCrashReason; |
| |
| switch (info->si_code) |
| { |
| default: |
| assert(false && "unexpected si_code for SIGSEGV"); |
| break; |
| case SEGV_MAPERR: |
| reason = ProcessMessage::eInvalidAddress; |
| break; |
| case SEGV_ACCERR: |
| reason = ProcessMessage::ePrivilegedAddress; |
| break; |
| } |
| |
| return reason; |
| } |
| |
| ProcessMessage::CrashReason |
| ProcessMonitor::GetCrashReasonForSIGILL(const siginfo_t *info) |
| { |
| ProcessMessage::CrashReason reason; |
| assert(info->si_signo == SIGILL); |
| |
| reason = ProcessMessage::eInvalidCrashReason; |
| |
| switch (info->si_code) |
| { |
| default: |
| assert(false && "unexpected si_code for SIGILL"); |
| break; |
| case ILL_ILLOPC: |
| reason = ProcessMessage::eIllegalOpcode; |
| break; |
| case ILL_ILLOPN: |
| reason = ProcessMessage::eIllegalOperand; |
| break; |
| case ILL_ILLADR: |
| reason = ProcessMessage::eIllegalAddressingMode; |
| break; |
| case ILL_ILLTRP: |
| reason = ProcessMessage::eIllegalTrap; |
| break; |
| case ILL_PRVOPC: |
| reason = ProcessMessage::ePrivilegedOpcode; |
| break; |
| case ILL_PRVREG: |
| reason = ProcessMessage::ePrivilegedRegister; |
| break; |
| case ILL_COPROC: |
| reason = ProcessMessage::eCoprocessorError; |
| break; |
| case ILL_BADSTK: |
| reason = ProcessMessage::eInternalStackError; |
| break; |
| } |
| |
| return reason; |
| } |
| |
| ProcessMessage::CrashReason |
| ProcessMonitor::GetCrashReasonForSIGFPE(const siginfo_t *info) |
| { |
| ProcessMessage::CrashReason reason; |
| assert(info->si_signo == SIGFPE); |
| |
| reason = ProcessMessage::eInvalidCrashReason; |
| |
| switch (info->si_code) |
| { |
| default: |
| assert(false && "unexpected si_code for SIGFPE"); |
| break; |
| case FPE_INTDIV: |
| reason = ProcessMessage::eIntegerDivideByZero; |
| break; |
| case FPE_INTOVF: |
| reason = ProcessMessage::eIntegerOverflow; |
| break; |
| case FPE_FLTDIV: |
| reason = ProcessMessage::eFloatDivideByZero; |
| break; |
| case FPE_FLTOVF: |
| reason = ProcessMessage::eFloatOverflow; |
| break; |
| case FPE_FLTUND: |
| reason = ProcessMessage::eFloatUnderflow; |
| break; |
| case FPE_FLTRES: |
| reason = ProcessMessage::eFloatInexactResult; |
| break; |
| case FPE_FLTINV: |
| reason = ProcessMessage::eFloatInvalidOperation; |
| break; |
| case FPE_FLTSUB: |
| reason = ProcessMessage::eFloatSubscriptRange; |
| break; |
| } |
| |
| return reason; |
| } |
| |
| ProcessMessage::CrashReason |
| ProcessMonitor::GetCrashReasonForSIGBUS(const siginfo_t *info) |
| { |
| ProcessMessage::CrashReason reason; |
| assert(info->si_signo == SIGBUS); |
| |
| reason = ProcessMessage::eInvalidCrashReason; |
| |
| switch (info->si_code) |
| { |
| default: |
| assert(false && "unexpected si_code for SIGBUS"); |
| break; |
| case BUS_ADRALN: |
| reason = ProcessMessage::eIllegalAlignment; |
| break; |
| case BUS_ADRERR: |
| reason = ProcessMessage::eIllegalAddress; |
| break; |
| case BUS_OBJERR: |
| reason = ProcessMessage::eHardwareError; |
| break; |
| } |
| |
| return reason; |
| } |
| |
| void |
| ProcessMonitor::ServeOperation(OperationArgs *args) |
| { |
| int status; |
| pollfd fdset; |
| |
| ProcessMonitor *monitor = args->m_monitor; |
| |
| fdset.fd = monitor->m_server_fd; |
| fdset.events = POLLIN | POLLPRI; |
| fdset.revents = 0; |
| |
| // We are finised with the arguments and are ready to go. Sync with the |
| // parent thread and start serving operations on the inferior. |
| sem_post(&args->m_semaphore); |
| |
| for (;;) |
| { |
| if ((status = poll(&fdset, 1, -1)) < 0) |
| { |
| switch (errno) |
| { |
| default: |
| assert(false && "Unexpected poll() failure!"); |
| continue; |
| |
| case EINTR: continue; // Just poll again. |
| case EBADF: return; // Connection terminated. |
| } |
| } |
| |
| assert(status == 1 && "Too many descriptors!"); |
| |
| if (fdset.revents & POLLIN) |
| { |
| Operation *op = NULL; |
| |
| READ_AGAIN: |
| if ((status = read(fdset.fd, &op, sizeof(op))) < 0) |
| { |
| // There is only one acceptable failure. |
| assert(errno == EINTR); |
| goto READ_AGAIN; |
| } |
| if (status == 0) |
| continue; // Poll again. The connection probably terminated. |
| assert(status == sizeof(op)); |
| op->Execute(monitor); |
| write(fdset.fd, &op, sizeof(op)); |
| } |
| } |
| } |
| |
| void |
| ProcessMonitor::DoOperation(Operation *op) |
| { |
| int status; |
| Operation *ack = NULL; |
| Mutex::Locker lock(m_server_mutex); |
| |
| // FIXME: Do proper error checking here. |
| write(m_client_fd, &op, sizeof(op)); |
| |
| READ_AGAIN: |
| if ((status = read(m_client_fd, &ack, sizeof(ack))) < 0) |
| { |
| // If interrupted by a signal handler try again. Otherwise the monitor |
| // thread probably died and we have a stale file descriptor -- abort the |
| // operation. |
| if (errno == EINTR) |
| goto READ_AGAIN; |
| return; |
| } |
| |
| assert(status == sizeof(ack)); |
| assert(ack == op && "Invalid monitor thread response!"); |
| } |
| |
| size_t |
| ProcessMonitor::ReadMemory(lldb::addr_t vm_addr, void *buf, size_t size, |
| Error &error) |
| { |
| size_t result; |
| ReadOperation op(vm_addr, buf, size, error, result); |
| DoOperation(&op); |
| return result; |
| } |
| |
| size_t |
| ProcessMonitor::WriteMemory(lldb::addr_t vm_addr, const void *buf, size_t size, |
| lldb_private::Error &error) |
| { |
| size_t result; |
| WriteOperation op(vm_addr, buf, size, error, result); |
| DoOperation(&op); |
| return result; |
| } |
| |
| bool |
| ProcessMonitor::ReadRegisterValue(lldb::tid_t tid, unsigned offset, const char* reg_name, |
| unsigned size, RegisterValue &value) |
| { |
| bool result; |
| ReadRegOperation op(tid, offset, reg_name, value, result); |
| DoOperation(&op); |
| return result; |
| } |
| |
| bool |
| ProcessMonitor::WriteRegisterValue(lldb::tid_t tid, unsigned offset, |
| const char* reg_name, const RegisterValue &value) |
| { |
| bool result; |
| WriteRegOperation op(tid, offset, reg_name, value, result); |
| DoOperation(&op); |
| return result; |
| } |
| |
| bool |
| ProcessMonitor::ReadGPR(lldb::tid_t tid, void *buf, size_t buf_size) |
| { |
| bool result; |
| ReadGPROperation op(tid, buf, buf_size, result); |
| DoOperation(&op); |
| return result; |
| } |
| |
| bool |
| ProcessMonitor::ReadFPR(lldb::tid_t tid, void *buf, size_t buf_size) |
| { |
| bool result; |
| ReadFPROperation op(tid, buf, buf_size, result); |
| DoOperation(&op); |
| return result; |
| } |
| |
| bool |
| ProcessMonitor::ReadRegisterSet(lldb::tid_t tid, void *buf, size_t buf_size, unsigned int regset) |
| { |
| bool result; |
| ReadRegisterSetOperation op(tid, buf, buf_size, regset, result); |
| DoOperation(&op); |
| return result; |
| } |
| |
| bool |
| ProcessMonitor::WriteGPR(lldb::tid_t tid, void *buf, size_t buf_size) |
| { |
| bool result; |
| WriteGPROperation op(tid, buf, buf_size, result); |
| DoOperation(&op); |
| return result; |
| } |
| |
| bool |
| ProcessMonitor::WriteFPR(lldb::tid_t tid, void *buf, size_t buf_size) |
| { |
| bool result; |
| WriteFPROperation op(tid, buf, buf_size, result); |
| DoOperation(&op); |
| return result; |
| } |
| |
| bool |
| ProcessMonitor::WriteRegisterSet(lldb::tid_t tid, void *buf, size_t buf_size, unsigned int regset) |
| { |
| bool result; |
| WriteRegisterSetOperation op(tid, buf, buf_size, regset, result); |
| DoOperation(&op); |
| return result; |
| } |
| |
| bool |
| ProcessMonitor::Resume(lldb::tid_t tid, uint32_t signo) |
| { |
| bool result; |
| ResumeOperation op(tid, signo, result); |
| DoOperation(&op); |
| return result; |
| } |
| |
| bool |
| ProcessMonitor::SingleStep(lldb::tid_t tid, uint32_t signo) |
| { |
| bool result; |
| SingleStepOperation op(tid, signo, result); |
| DoOperation(&op); |
| return result; |
| } |
| |
| bool |
| ProcessMonitor::BringProcessIntoLimbo() |
| { |
| bool result; |
| KillOperation op(result); |
| DoOperation(&op); |
| return result; |
| } |
| |
| bool |
| ProcessMonitor::GetSignalInfo(lldb::tid_t tid, void *siginfo, int &ptrace_err) |
| { |
| bool result; |
| SiginfoOperation op(tid, siginfo, result, ptrace_err); |
| DoOperation(&op); |
| return result; |
| } |
| |
| bool |
| ProcessMonitor::GetEventMessage(lldb::tid_t tid, unsigned long *message) |
| { |
| bool result; |
| EventMessageOperation op(tid, message, result); |
| DoOperation(&op); |
| return result; |
| } |
| |
| lldb_private::Error |
| ProcessMonitor::Detach() |
| { |
| lldb_private::Error error; |
| if (m_pid != LLDB_INVALID_PROCESS_ID) { |
| DetachOperation op(error); |
| DoOperation(&op); |
| } |
| return error; |
| } |
| |
| bool |
| ProcessMonitor::DupDescriptor(const char *path, int fd, int flags) |
| { |
| int target_fd = open(path, flags, 0666); |
| |
| if (target_fd == -1) |
| return false; |
| |
| return (dup2(target_fd, fd) == -1) ? false : true; |
| } |
| |
| void |
| ProcessMonitor::StopMonitoringChildProcess() |
| { |
| lldb::thread_result_t thread_result; |
| |
| if (IS_VALID_LLDB_HOST_THREAD(m_monitor_thread)) |
| { |
| Host::ThreadCancel(m_monitor_thread, NULL); |
| Host::ThreadJoin(m_monitor_thread, &thread_result, NULL); |
| m_monitor_thread = LLDB_INVALID_HOST_THREAD; |
| } |
| } |
| |
| void |
| ProcessMonitor::StopMonitor() |
| { |
| StopMonitoringChildProcess(); |
| StopOpThread(); |
| CloseFD(m_terminal_fd); |
| CloseFD(m_client_fd); |
| CloseFD(m_server_fd); |
| } |
| |
| void |
| ProcessMonitor::StopOpThread() |
| { |
| lldb::thread_result_t result; |
| |
| if (!IS_VALID_LLDB_HOST_THREAD(m_operation_thread)) |
| return; |
| |
| Host::ThreadCancel(m_operation_thread, NULL); |
| Host::ThreadJoin(m_operation_thread, &result, NULL); |
| m_operation_thread = LLDB_INVALID_HOST_THREAD; |
| } |
| |
| void |
| ProcessMonitor::CloseFD(int &fd) |
| { |
| if (fd != -1) |
| { |
| close(fd); |
| fd = -1; |
| } |
| } |
