| //===-- ProcessMonitor.cpp ------------------------------------ -*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // C Includes |
| #include <errno.h> |
| #include <poll.h> |
| #include <string.h> |
| #include <stdint.h> |
| #include <unistd.h> |
| #include <signal.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/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 "ProcessFreeBSD.h" |
| #include "ProcessPOSIXLog.h" |
| #include "ProcessMonitor.h" |
| |
| extern "C" { |
| extern char ** environ; |
| } |
| |
| using namespace lldb; |
| using namespace lldb_private; |
| |
| // We disable the tracing of ptrace calls for integration builds to |
| // avoid the additional indirection and checks. |
| #ifndef LLDB_CONFIGURATION_BUILDANDINTEGRATION |
| // Wrapper for ptrace to catch errors and log calls. |
| |
| const char * |
| Get_PT_IO_OP(int op) |
| { |
| switch (op) { |
| case PIOD_READ_D: return "READ_D"; |
| case PIOD_WRITE_D: return "WRITE_D"; |
| case PIOD_READ_I: return "READ_I"; |
| case PIOD_WRITE_I: return "WRITE_I"; |
| default: return "Unknown op"; |
| } |
| } |
| |
| // Wrapper for ptrace to catch errors and log calls. |
| // Note that ptrace sets errno on error because -1 is reserved as a valid result. |
| extern long |
| PtraceWrapper(int req, lldb::pid_t pid, void *addr, int data, |
| const char* reqName, const char* file, int line) |
| { |
| long int result; |
| |
| Log *log (ProcessPOSIXLog::GetLogIfAllCategoriesSet(POSIX_LOG_PTRACE)); |
| |
| if (log) { |
| log->Printf("ptrace(%s, %" PRIu64 ", %p, %x) called from file %s line %d", |
| reqName, pid, addr, data, file, line); |
| if (req == PT_IO) { |
| struct ptrace_io_desc *pi = (struct ptrace_io_desc *) addr; |
| |
| log->Printf("PT_IO: op=%s offs=%zx size=%zu", |
| Get_PT_IO_OP(pi->piod_op), (size_t)pi->piod_offs, pi->piod_len); |
| } |
| } |
| |
| //PtraceDisplayBytes(req, data); |
| |
| errno = 0; |
| result = ptrace(req, pid, (caddr_t) addr, data); |
| |
| //PtraceDisplayBytes(req, data); |
| |
| 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); |
| } |
| |
| if (log) { |
| #ifdef __amd64__ |
| if (req == PT_GETREGS) { |
| struct reg *r = (struct reg *) addr; |
| |
| log->Printf("PT_GETREGS: ip=0x%lx", r->r_rip); |
| log->Printf("PT_GETREGS: sp=0x%lx", r->r_rsp); |
| log->Printf("PT_GETREGS: bp=0x%lx", r->r_rbp); |
| log->Printf("PT_GETREGS: ax=0x%lx", r->r_rax); |
| } |
| #endif |
| if (req == PT_GETDBREGS || req == PT_SETDBREGS) { |
| struct dbreg *r = (struct dbreg *) addr; |
| char setget = (req == PT_GETDBREGS) ? 'G' : 'S'; |
| |
| for (int i = 0; i <= 7; i++) |
| log->Printf("PT_%cETDBREGS: dr[%d]=0x%lx", setget, i, r->dr[i]); |
| } |
| } |
| |
| return result; |
| } |
| |
| // Wrapper for ptrace when logging is not required. |
| // Sets errno to 0 prior to calling ptrace. |
| extern long |
| PtraceWrapper(int req, lldb::pid_t pid, void *addr, int data) |
| { |
| long result = 0; |
| errno = 0; |
| result = ptrace(req, pid, (caddr_t)addr, data); |
| return result; |
| } |
| |
| #define PTRACE(req, pid, addr, data) \ |
| PtraceWrapper((req), (pid), (addr), (data), #req, __FILE__, __LINE__) |
| #else |
| PtraceWrapper((req), (pid), (addr), (data)) |
| #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) |
| { |
| struct ptrace_io_desc pi_desc; |
| |
| pi_desc.piod_op = PIOD_READ_D; |
| pi_desc.piod_offs = (void *)vm_addr; |
| pi_desc.piod_addr = buf; |
| pi_desc.piod_len = size; |
| |
| if (PTRACE(PT_IO, pid, (caddr_t)&pi_desc, 0) < 0) |
| error.SetErrorToErrno(); |
| return pi_desc.piod_len; |
| } |
| |
| static size_t |
| DoWriteMemory(lldb::pid_t pid, lldb::addr_t vm_addr, const void *buf, |
| size_t size, Error &error) |
| { |
| struct ptrace_io_desc pi_desc; |
| |
| pi_desc.piod_op = PIOD_WRITE_D; |
| pi_desc.piod_offs = (void *)vm_addr; |
| pi_desc.piod_addr = (void *)buf; |
| pi_desc.piod_len = size; |
| |
| if (PTRACE(PT_IO, pid, (caddr_t)&pi_desc, 0) < 0) |
| error.SetErrorToErrno(); |
| return pi_desc.piod_len; |
| } |
| |
| // 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 FreeBSD, 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 WriteOperation |
| /// @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, unsigned size, |
| RegisterValue &value, bool &result) |
| : m_tid(tid), m_offset(offset), m_size(size), |
| m_value(value), m_result(result) |
| { } |
| |
| void Execute(ProcessMonitor *monitor); |
| |
| private: |
| lldb::tid_t m_tid; |
| unsigned m_offset; |
| unsigned m_size; |
| RegisterValue &m_value; |
| bool &m_result; |
| }; |
| |
| void |
| ReadRegOperation::Execute(ProcessMonitor *monitor) |
| { |
| struct reg regs; |
| int rc; |
| |
| if ((rc = PTRACE(PT_GETREGS, m_tid, (caddr_t)®s, 0)) < 0) { |
| m_result = false; |
| } else { |
| if (m_size == sizeof(uintptr_t)) |
| m_value = *(uintptr_t *)(((caddr_t)®s) + m_offset); |
| else |
| memcpy(&m_value, (((caddr_t)®s) + m_offset), m_size); |
| m_result = true; |
| } |
| } |
| |
| //------------------------------------------------------------------------------ |
| /// @class WriteRegOperation |
| /// @brief Implements ProcessMonitor::WriteRegisterValue. |
| class WriteRegOperation : public Operation |
| { |
| public: |
| WriteRegOperation(lldb::tid_t tid, unsigned offset, |
| const RegisterValue &value, bool &result) |
| : m_tid(tid), m_offset(offset), |
| m_value(value), m_result(result) |
| { } |
| |
| void Execute(ProcessMonitor *monitor); |
| |
| private: |
| lldb::tid_t m_tid; |
| unsigned m_offset; |
| const RegisterValue &m_value; |
| bool &m_result; |
| }; |
| |
| void |
| WriteRegOperation::Execute(ProcessMonitor *monitor) |
| { |
| struct reg regs; |
| |
| if (PTRACE(PT_GETREGS, m_tid, (caddr_t)®s, 0) < 0) { |
| m_result = false; |
| return; |
| } |
| *(uintptr_t *)(((caddr_t)®s) + m_offset) = (uintptr_t)m_value.GetAsUInt64(); |
| if (PTRACE(PT_SETREGS, m_tid, (caddr_t)®s, 0) < 0) |
| m_result = false; |
| else |
| m_result = true; |
| } |
| |
| //------------------------------------------------------------------------------ |
| /// @class ReadDebugRegOperation |
| /// @brief Implements ProcessMonitor::ReadDebugRegisterValue. |
| class ReadDebugRegOperation : public Operation |
| { |
| public: |
| ReadDebugRegOperation(lldb::tid_t tid, unsigned offset, unsigned size, |
| RegisterValue &value, bool &result) |
| : m_tid(tid), m_offset(offset), m_size(size), |
| m_value(value), m_result(result) |
| { } |
| |
| void Execute(ProcessMonitor *monitor); |
| |
| private: |
| lldb::tid_t m_tid; |
| unsigned m_offset; |
| unsigned m_size; |
| RegisterValue &m_value; |
| bool &m_result; |
| }; |
| |
| void |
| ReadDebugRegOperation::Execute(ProcessMonitor *monitor) |
| { |
| struct dbreg regs; |
| int rc; |
| |
| if ((rc = PTRACE(PT_GETDBREGS, m_tid, (caddr_t)®s, 0)) < 0) { |
| m_result = false; |
| } else { |
| if (m_size == sizeof(uintptr_t)) |
| m_value = *(uintptr_t *)(((caddr_t)®s) + m_offset); |
| else |
| memcpy(&m_value, (((caddr_t)®s) + m_offset), m_size); |
| m_result = true; |
| } |
| } |
| |
| //------------------------------------------------------------------------------ |
| /// @class WriteDebugRegOperation |
| /// @brief Implements ProcessMonitor::WriteDebugRegisterValue. |
| class WriteDebugRegOperation : public Operation |
| { |
| public: |
| WriteDebugRegOperation(lldb::tid_t tid, unsigned offset, |
| const RegisterValue &value, bool &result) |
| : m_tid(tid), m_offset(offset), |
| m_value(value), m_result(result) |
| { } |
| |
| void Execute(ProcessMonitor *monitor); |
| |
| private: |
| lldb::tid_t m_tid; |
| unsigned m_offset; |
| const RegisterValue &m_value; |
| bool &m_result; |
| }; |
| |
| void |
| WriteDebugRegOperation::Execute(ProcessMonitor *monitor) |
| { |
| struct dbreg regs; |
| |
| if (PTRACE(PT_GETDBREGS, m_tid, (caddr_t)®s, 0) < 0) { |
| m_result = false; |
| return; |
| } |
| *(uintptr_t *)(((caddr_t)®s) + m_offset) = (uintptr_t)m_value.GetAsUInt64(); |
| if (PTRACE(PT_SETDBREGS, m_tid, (caddr_t)®s, 0) < 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, bool &result) |
| : m_tid(tid), m_buf(buf), m_result(result) |
| { } |
| |
| void Execute(ProcessMonitor *monitor); |
| |
| private: |
| lldb::tid_t m_tid; |
| void *m_buf; |
| bool &m_result; |
| }; |
| |
| void |
| ReadGPROperation::Execute(ProcessMonitor *monitor) |
| { |
| int rc; |
| |
| errno = 0; |
| rc = PTRACE(PT_GETREGS, m_tid, (caddr_t)m_buf, 0); |
| if (errno != 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, bool &result) |
| : m_tid(tid), m_buf(buf), m_result(result) |
| { } |
| |
| void Execute(ProcessMonitor *monitor); |
| |
| private: |
| lldb::tid_t m_tid; |
| void *m_buf; |
| bool &m_result; |
| }; |
| |
| void |
| ReadFPROperation::Execute(ProcessMonitor *monitor) |
| { |
| if (PTRACE(PT_GETFPREGS, m_tid, (caddr_t)m_buf, 0) < 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, bool &result) |
| : m_tid(tid), m_buf(buf), m_result(result) |
| { } |
| |
| void Execute(ProcessMonitor *monitor); |
| |
| private: |
| lldb::tid_t m_tid; |
| void *m_buf; |
| bool &m_result; |
| }; |
| |
| void |
| WriteGPROperation::Execute(ProcessMonitor *monitor) |
| { |
| if (PTRACE(PT_SETREGS, m_tid, (caddr_t)m_buf, 0) < 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, bool &result) |
| : m_tid(tid), m_buf(buf), m_result(result) |
| { } |
| |
| void Execute(ProcessMonitor *monitor); |
| |
| private: |
| lldb::tid_t m_tid; |
| void *m_buf; |
| bool &m_result; |
| }; |
| |
| void |
| WriteFPROperation::Execute(ProcessMonitor *monitor) |
| { |
| if (PTRACE(PT_SETFPREGS, m_tid, (caddr_t)m_buf, 0) < 0) |
| m_result = false; |
| else |
| m_result = true; |
| } |
| |
| //------------------------------------------------------------------------------ |
| /// @class ResumeOperation |
| /// @brief Implements ProcessMonitor::Resume. |
| class ResumeOperation : public Operation |
| { |
| public: |
| ResumeOperation(uint32_t signo, bool &result) : |
| m_signo(signo), m_result(result) { } |
| |
| void Execute(ProcessMonitor *monitor); |
| |
| private: |
| uint32_t m_signo; |
| bool &m_result; |
| }; |
| |
| void |
| ResumeOperation::Execute(ProcessMonitor *monitor) |
| { |
| lldb::pid_t pid = monitor->GetPID(); |
| int data = 0; |
| |
| if (m_signo != LLDB_INVALID_SIGNAL_NUMBER) |
| data = m_signo; |
| |
| if (PTRACE(PT_CONTINUE, pid, (caddr_t)1, data)) |
| { |
| Log *log (ProcessPOSIXLog::GetLogIfAllCategoriesSet (POSIX_LOG_PROCESS)); |
| |
| if (log) |
| log->Printf ("ResumeOperation (%" PRIu64 ") failed: %s", pid, strerror(errno)); |
| m_result = false; |
| } |
| else |
| m_result = true; |
| } |
| |
| //------------------------------------------------------------------------------ |
| /// @class SingleStepOperation |
| /// @brief Implements ProcessMonitor::SingleStep. |
| class SingleStepOperation : public Operation |
| { |
| public: |
| SingleStepOperation(uint32_t signo, bool &result) |
| : m_signo(signo), m_result(result) { } |
| |
| void Execute(ProcessMonitor *monitor); |
| |
| private: |
| uint32_t m_signo; |
| bool &m_result; |
| }; |
| |
| void |
| SingleStepOperation::Execute(ProcessMonitor *monitor) |
| { |
| lldb::pid_t pid = monitor->GetPID(); |
| int data = 0; |
| |
| if (m_signo != LLDB_INVALID_SIGNAL_NUMBER) |
| data = m_signo; |
| |
| if (PTRACE(PT_STEP, pid, NULL, data)) |
| m_result = false; |
| else |
| m_result = true; |
| } |
| |
| //------------------------------------------------------------------------------ |
| /// @class LwpInfoOperation |
| /// @brief Implements ProcessMonitor::GetLwpInfo. |
| class LwpInfoOperation : public Operation |
| { |
| public: |
| LwpInfoOperation(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 |
| LwpInfoOperation::Execute(ProcessMonitor *monitor) |
| { |
| struct ptrace_lwpinfo plwp; |
| |
| if (PTRACE(PT_LWPINFO, m_tid, (caddr_t)&plwp, sizeof(plwp))) { |
| m_result = false; |
| m_err = errno; |
| } else { |
| memcpy(m_info, &plwp, sizeof(plwp)); |
| m_result = true; |
| } |
| } |
| |
| //------------------------------------------------------------------------------ |
| /// @class ThreadSuspendOperation |
| /// @brief Implements ProcessMonitor::ThreadSuspend. |
| class ThreadSuspendOperation : public Operation |
| { |
| public: |
| ThreadSuspendOperation(lldb::tid_t tid, bool suspend, bool &result) |
| : m_tid(tid), m_suspend(suspend), m_result(result) { } |
| |
| void Execute(ProcessMonitor *monitor); |
| |
| private: |
| lldb::tid_t m_tid; |
| bool m_suspend; |
| bool &m_result; |
| } ; |
| |
| void |
| ThreadSuspendOperation::Execute(ProcessMonitor *monitor) |
| { |
| m_result = !PTRACE(m_suspend ? PT_SUSPEND : PT_RESUME, m_tid, NULL, 0); |
| } |
| |
| |
| |
| //------------------------------------------------------------------------------ |
| /// @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) |
| { |
| struct ptrace_lwpinfo plwp; |
| |
| if (PTRACE(PT_LWPINFO, m_tid, (caddr_t)&plwp, sizeof(plwp))) |
| m_result = false; |
| else { |
| if (plwp.pl_flags & PL_FLAG_FORKED) { |
| *m_message = plwp.pl_child_pid; |
| m_result = true; |
| } else |
| m_result = false; |
| } |
| } |
| |
| //------------------------------------------------------------------------------ |
| /// @class KillOperation |
| /// @brief Implements ProcessMonitor::Kill. |
| 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(PT_KILL, pid, NULL, 0)) |
| m_result = false; |
| else |
| m_result = true; |
| } |
| |
| //------------------------------------------------------------------------------ |
| /// @class DetachOperation |
| /// @brief Implements ProcessMonitor::Detach. |
| 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 ProcessFreeBSD 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<ProcessFreeBSD *>(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_operation(0) |
| { |
| std::unique_ptr<LaunchArgs> args(new LaunchArgs(this, module, argv, envp, |
| stdin_path, stdout_path, stderr_path, |
| working_dir)); |
| |
| |
| sem_init(&m_operation_pending, 0, 0); |
| sem_init(&m_operation_done, 0, 0); |
| |
| 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<ProcessFreeBSD *>(process)), |
| m_operation_thread(LLDB_INVALID_HOST_THREAD), |
| m_monitor_thread(LLDB_INVALID_HOST_THREAD), |
| m_pid(pid), |
| m_terminal_fd(-1), |
| m_operation(0) |
| { |
| sem_init(&m_operation_pending, 0, 0); |
| sem_init(&m_operation_done, 0, 0); |
| |
| |
| std::unique_ptr<AttachArgs> args(new AttachArgs(this, pid)); |
| |
| 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.freebsd.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; |
| ProcessFreeBSD &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; |
| |
| // Propagate the environment if one is not supplied. |
| if (envp == NULL || envp[0] == NULL) |
| envp = const_cast<const char **>(environ); |
| |
| 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, |
| eSetGidFailed |
| }; |
| |
| // Child process. |
| if (pid == 0) |
| { |
| // Trace this process. |
| if (PTRACE(PT_TRACE_ME, 0, NULL, 0) < 0) |
| exit(ePtraceFailed); |
| |
| // Do not inherit setgid powers. |
| if (setgid(getgid()) != 0) |
| exit(eSetGidFailed); |
| |
| // 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; |
| case eSetGidFailed: |
| args->m_error.SetErrorString("Child setgid failed."); |
| break; |
| default: |
| args->m_error.SetErrorString("Child returned unknown exit status."); |
| break; |
| } |
| goto FINISH; |
| } |
| assert(WIFSTOPPED(status) && wpid == (::pid_t)pid && |
| "Could not sync with inferior process."); |
| |
| #ifdef notyet |
| // Have the child raise an event on exit. This is used to keep the child in |
| // limbo until it is destroyed. |
| if (PTRACE(PTRACE_SETOPTIONS, pid, NULL, PTRACE_O_TRACEEXIT) < 0) |
| { |
| args->m_error.SetErrorToErrno(); |
| goto FINISH; |
| } |
| #endif |
| // 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 ProcessFreeBSD::GetSTDOUT to have a non-blocking |
| // descriptor to read from). |
| if (!EnsureFDFlags(monitor->m_terminal_fd, O_NONBLOCK, args->m_error)) |
| goto FINISH; |
| |
| process.SendMessage(ProcessMessage::Attach(pid)); |
| |
| FINISH: |
| return args->m_error.Success(); |
| } |
| |
| void |
| ProcessMonitor::StartAttachOpThread(AttachArgs *args, lldb_private::Error &error) |
| { |
| static const char *g_thread_name = "lldb.process.freebsd.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)) |
| return NULL; |
| |
| ServeOperation(args); |
| return NULL; |
| } |
| |
| bool |
| ProcessMonitor::Attach(AttachArgs *args) |
| { |
| lldb::pid_t pid = args->m_pid; |
| |
| ProcessMonitor *monitor = args->m_monitor; |
| ProcessFreeBSD &process = monitor->GetProcess(); |
| |
| 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(PT_ATTACH, pid, NULL, 0) < 0) |
| { |
| args->m_error.SetErrorToErrno(); |
| goto FINISH; |
| } |
| |
| int status; |
| if ((status = waitpid(pid, NULL, 0)) < 0) |
| { |
| args->m_error.SetErrorToErrno(); |
| goto FINISH; |
| } |
| |
| process.SendMessage(ProcessMessage::Attach(pid)); |
| |
| FINISH: |
| return args->m_error.Success(); |
| } |
| |
| size_t |
| ProcessMonitor::GetCurrentThreadIDs(std::vector<lldb::tid_t>&thread_ids) |
| { |
| lwpid_t *tids; |
| int tdcnt; |
| |
| thread_ids.clear(); |
| |
| tdcnt = PTRACE(PT_GETNUMLWPS, m_pid, NULL, 0); |
| if (tdcnt <= 0) |
| return 0; |
| tids = (lwpid_t *)malloc(tdcnt * sizeof(*tids)); |
| if (tids == NULL) |
| return 0; |
| if (PTRACE(PT_GETLWPLIST, m_pid, (void *)tids, tdcnt) < 0) { |
| free(tids); |
| return 0; |
| } |
| thread_ids = std::vector<lldb::tid_t>(tids, tids + tdcnt); |
| free(tids); |
| return thread_ids.size(); |
| } |
| |
| 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); |
| ProcessFreeBSD *process = monitor->m_process; |
| assert(process); |
| bool stop_monitoring; |
| struct ptrace_lwpinfo plwp; |
| int ptrace_err; |
| |
| Log *log (ProcessPOSIXLog::GetLogIfAllCategoriesSet (POSIX_LOG_PROCESS)); |
| |
| if (exited) |
| { |
| if (log) |
| log->Printf ("ProcessMonitor::%s() got exit signal, tid = %" PRIu64, __FUNCTION__, pid); |
| message = ProcessMessage::Exit(pid, status); |
| process->SendMessage(message); |
| return pid == process->GetID(); |
| } |
| |
| if (!monitor->GetLwpInfo(pid, &plwp, ptrace_err)) |
| stop_monitoring = true; // pid is gone. Bail. |
| else { |
| switch (plwp.pl_siginfo.si_signo) |
| { |
| case SIGTRAP: |
| message = MonitorSIGTRAP(monitor, &plwp.pl_siginfo, plwp.pl_lwpid); |
| break; |
| |
| default: |
| message = MonitorSignal(monitor, &plwp.pl_siginfo, plwp.pl_lwpid); |
| break; |
| } |
| |
| process->SendMessage(message); |
| stop_monitoring = message.GetKind() == ProcessMessage::eExitMessage; |
| } |
| |
| return stop_monitoring; |
| } |
| |
| ProcessMessage |
| ProcessMonitor::MonitorSIGTRAP(ProcessMonitor *monitor, |
| const siginfo_t *info, lldb::tid_t tid) |
| { |
| ProcessMessage message; |
| |
| Log *log (ProcessPOSIXLog::GetLogIfAllCategoriesSet (POSIX_LOG_PROCESS)); |
| |
| 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_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(tid, &data)) |
| data = -1; |
| if (log) |
| log->Printf ("ProcessMonitor::%s() received exit? event, data = %lx, tid = %" PRIu64, __FUNCTION__, data, tid); |
| message = ProcessMessage::Limbo(tid, (data >> 8)); |
| break; |
| } |
| |
| case 0: |
| case TRAP_TRACE: |
| if (log) |
| log->Printf ("ProcessMonitor::%s() received trace event, tid = %" PRIu64 " : si_code = %d", __FUNCTION__, tid, info->si_code); |
| message = ProcessMessage::Trace(tid); |
| break; |
| |
| case SI_KERNEL: |
| case TRAP_BRKPT: |
| if (log) |
| log->Printf ("ProcessMonitor::%s() received breakpoint event, tid = %" PRIu64, __FUNCTION__, tid); |
| message = ProcessMessage::Break(tid); |
| break; |
| } |
| |
| return message; |
| } |
| |
| ProcessMessage |
| ProcessMonitor::MonitorSignal(ProcessMonitor *monitor, |
| const siginfo_t *info, lldb::tid_t tid) |
| { |
| ProcessMessage message; |
| int signo = info->si_signo; |
| |
| Log *log (ProcessPOSIXLog::GetLogIfAllCategoriesSet (POSIX_LOG_PROCESS)); |
| |
| // 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 FreeBSD. |
| // |
| // 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_USER) |
| { |
| if (log) |
| log->Printf ("ProcessMonitor::%s() received signal %s with code %s, pid = %d", |
| __FUNCTION__, |
| monitor->m_process->GetUnixSignals().GetSignalAsCString (signo), |
| "SI_USER", |
| info->si_pid); |
| if (info->si_pid == getpid()) |
| return ProcessMessage::SignalDelivered(tid, signo); |
| else |
| return ProcessMessage::Signal(tid, signo); |
| } |
| |
| if (log) |
| log->Printf ("ProcessMonitor::%s() received signal %s", __FUNCTION__, monitor->m_process->GetUnixSignals().GetSignalAsCString (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(tid, 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(tid, 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(tid, 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(tid, reason, signo, fault_addr); |
| } |
| |
| // Everything else is "normal" and does not require any special action on |
| // our part. |
| return ProcessMessage::Signal(tid, 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) |
| { |
| ProcessMonitor *monitor = args->m_monitor; |
| |
| // 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 (;;) |
| { |
| // wait for next pending operation |
| sem_wait(&monitor->m_operation_pending); |
| |
| monitor->m_operation->Execute(monitor); |
| |
| // notify calling thread that operation is complete |
| sem_post(&monitor->m_operation_done); |
| } |
| } |
| |
| void |
| ProcessMonitor::DoOperation(Operation *op) |
| { |
| Mutex::Locker lock(m_operation_mutex); |
| |
| m_operation = op; |
| |
| // notify operation thread that an operation is ready to be processed |
| sem_post(&m_operation_pending); |
| |
| // wait for operation to complete |
| sem_wait(&m_operation_done); |
| } |
| |
| 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, size, 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, value, result); |
| DoOperation(&op); |
| return result; |
| } |
| |
| bool |
| ProcessMonitor::ReadDebugRegisterValue(lldb::tid_t tid, unsigned offset, |
| const char *reg_name, unsigned size, |
| lldb_private::RegisterValue &value) |
| { |
| bool result; |
| ReadDebugRegOperation op(tid, offset, size, value, result); |
| DoOperation(&op); |
| return result; |
| } |
| |
| bool |
| ProcessMonitor::WriteDebugRegisterValue(lldb::tid_t tid, unsigned offset, |
| const char *reg_name, |
| const lldb_private::RegisterValue &value) |
| { |
| bool result; |
| WriteDebugRegOperation op(tid, offset, 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, result); |
| DoOperation(&op); |
| return result; |
| } |
| |
| bool |
| ProcessMonitor::ReadFPR(lldb::tid_t tid, void *buf, size_t buf_size) |
| { |
| bool result; |
| ReadFPROperation op(tid, buf, result); |
| DoOperation(&op); |
| return result; |
| } |
| |
| bool |
| ProcessMonitor::ReadRegisterSet(lldb::tid_t tid, void *buf, size_t buf_size, unsigned int regset) |
| { |
| return false; |
| } |
| |
| bool |
| ProcessMonitor::WriteGPR(lldb::tid_t tid, void *buf, size_t buf_size) |
| { |
| bool result; |
| WriteGPROperation op(tid, buf, result); |
| DoOperation(&op); |
| return result; |
| } |
| |
| bool |
| ProcessMonitor::WriteFPR(lldb::tid_t tid, void *buf, size_t buf_size) |
| { |
| bool result; |
| WriteFPROperation op(tid, buf, result); |
| DoOperation(&op); |
| return result; |
| } |
| |
| bool |
| ProcessMonitor::WriteRegisterSet(lldb::tid_t tid, void *buf, size_t buf_size, unsigned int regset) |
| { |
| return false; |
| } |
| |
| bool |
| ProcessMonitor::ReadThreadPointer(lldb::tid_t tid, lldb::addr_t &value) |
| { |
| return false; |
| } |
| |
| bool |
| ProcessMonitor::Resume(lldb::tid_t unused, uint32_t signo) |
| { |
| bool result; |
| Log *log (ProcessPOSIXLog::GetLogIfAllCategoriesSet (POSIX_LOG_PROCESS)); |
| |
| if (log) { |
| const char *signame = m_process->GetUnixSignals().GetSignalAsCString (signo); |
| if (signame == nullptr) |
| signame = "<none>"; |
| log->Printf("ProcessMonitor::%s() resuming pid %" PRIu64 " with signal %s", |
| __FUNCTION__, GetPID(), signame); |
| } |
| ResumeOperation op(signo, result); |
| DoOperation(&op); |
| if (log) |
| log->Printf ("ProcessMonitor::%s() resuming result = %s", __FUNCTION__, result ? "true" : "false"); |
| return result; |
| } |
| |
| bool |
| ProcessMonitor::SingleStep(lldb::tid_t unused, uint32_t signo) |
| { |
| bool result; |
| SingleStepOperation op(signo, result); |
| DoOperation(&op); |
| return result; |
| } |
| |
| bool |
| ProcessMonitor::Kill() |
| { |
| bool result; |
| KillOperation op(result); |
| DoOperation(&op); |
| return result; |
| } |
| |
| bool |
| ProcessMonitor::GetLwpInfo(lldb::tid_t tid, void *lwpinfo, int &ptrace_err) |
| { |
| bool result; |
| LwpInfoOperation op(tid, lwpinfo, result, ptrace_err); |
| DoOperation(&op); |
| return result; |
| } |
| |
| bool |
| ProcessMonitor::ThreadSuspend(lldb::tid_t tid, bool suspend) |
| { |
| bool result; |
| ThreadSuspendOperation op(tid, suspend, result); |
| 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::tid_t tid) |
| { |
| lldb_private::Error error; |
| if (tid != LLDB_INVALID_THREAD_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(); |
| sem_destroy(&m_operation_pending); |
| sem_destroy(&m_operation_done); |
| |
| // Note: ProcessPOSIX passes the m_terminal_fd file descriptor to |
| // Process::SetSTDIOFileDescriptor, which in turn transfers ownership of |
| // the descriptor to a ConnectionFileDescriptor object. Consequently |
| // even though still has the file descriptor, we shouldn't close it here. |
| } |
| |
| // FIXME: On Linux, when a new thread is created, we receive to notifications, |
| // (1) a SIGTRAP|PTRACE_EVENT_CLONE from the main process thread with the |
| // child thread id as additional information, and (2) a SIGSTOP|SI_USER from |
| // the new child thread indicating that it has is stopped because we attached. |
| // We have no guarantee of the order in which these arrive, but we need both |
| // before we are ready to proceed. We currently keep a list of threads which |
| // have sent the initial SIGSTOP|SI_USER event. Then when we receive the |
| // SIGTRAP|PTRACE_EVENT_CLONE notification, if the initial stop has not occurred |
| // we call ProcessMonitor::WaitForInitialTIDStop() to wait for it. |
| // |
| // Right now, the above logic is in ProcessPOSIX, so we need a definition of |
| // this function in the FreeBSD ProcessMonitor implementation even if it isn't |
| // logically needed. |
| // |
| // We really should figure out what actually happens on FreeBSD and move the |
| // Linux-specific logic out of ProcessPOSIX as needed. |
| |
| bool |
| ProcessMonitor::WaitForInitialTIDStop(lldb::tid_t tid) |
| { |
| return true; |
| } |
| |
| 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; |
| } |
