Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

 #include <stdarg.h>

 #include <stdio.h>

 #include <stdlib.h>

 #include <string.h>

 #include <fcntl.h>

 #include <thread_db.h>

 #include "libproc_impl.h"

 static const char* alt_root = NULL;

 static int alt_root_len = -1;

 #define SA_ALTROOT "SA_ALTROOT"

 static void init_alt_root() {

    if (alt_root_len == -1) {

       alt_root = getenv(SA_ALTROOT);

       if (alt_root) {

          alt_root_len = strlen(alt_root);

       } else {

          alt_root_len = 0;

       }

    }

 }

 int pathmap_open(const char* name) {

    int fd;

    char alt_path[PATH_MAX + 1];

    init_alt_root();

    if (alt_root_len > 0) {

       strcpy(alt_path, alt_root);

       strcat(alt_path, name);

       fd = open(alt_path, O_RDONLY);

       if (fd >= 0) {

          print_debug("path %s substituted for %s\n", alt_path, name);

          return fd;

       }

       if (strrchr(name, '/')) {

          strcpy(alt_path, alt_root);

          strcat(alt_path, strrchr(name, '/'));

          fd = open(alt_path, O_RDONLY);

          if (fd >= 0) {

             print_debug("path %s substituted for %s\n", alt_path, name);

             return fd;

          }

       }

    } else {

       fd = open(name, O_RDONLY);

       if (fd >= 0) {

          return fd;

       }

    }

    return -1;

 }

 static bool _libsaproc_debug;

 void print_debug(const char* format,...) {

    if (_libsaproc_debug) {

      va_list alist;

      va_start(alist, format);

      fputs("libsaproc DEBUG: ", stderr);

      vfprintf(stderr, format, alist);

      va_end(alist);

    }

 }

 void print_error(const char* format,...) {

   va_list alist;

   va_start(alist, format);

   fputs("ERROR: ", stderr);

   vfprintf(stderr, format, alist);

   va_end(alist);

 }

 bool is_debug() {

    return _libsaproc_debug;

 }

 // initialize libproc

 bool init_libproc(bool debug) {

    // init debug mode

    _libsaproc_debug = debug;

    // initialize the thread_db library

    if (td_init() != TD_OK) {

      print_debug("libthread_db's td_init failed\n");

      return false;

    }

    return true;

 }

 static void destroy_lib_info(struct ps_prochandle* ph) {

    lib_info* lib = ph->libs;

    while (lib) {

      lib_info *next = lib->next;

      if (lib->symtab) {

         destroy_symtab(lib->symtab);

      }

      free(lib);

      lib = next;

    }

 }

 static void destroy_thread_info(struct ps_prochandle* ph) {

    thread_info* thr = ph->threads;

    while (thr) {

      thread_info *next = thr->next;

      free(thr);

      thr = next;

    }

 }

 // ps_prochandle cleanup

 // ps_prochandle cleanup

 void Prelease(struct ps_prochandle* ph) {

    // do the "derived class" clean-up first

    ph->ops->release(ph);

    destroy_lib_info(ph);

    destroy_thread_info(ph);

    free(ph);

 }

 lib_info* add_lib_info(struct ps_prochandle* ph, const char* libname, uintptr_t base) {

    return add_lib_info_fd(ph, libname, -1, base);

 }

 lib_info* add_lib_info_fd(struct ps_prochandle* ph, const char* libname, int fd, uintptr_t base) {

    lib_info* newlib;

    if ( (newlib = (lib_info*) calloc(1, sizeof(struct lib_info))) == NULL) {

       print_debug("can't allocate memory for lib_info\n");

       return NULL;

    }

    strncpy(newlib->name, libname, sizeof(newlib->name));

    newlib->base = base;

    if (fd == -1) {

       if ( (newlib->fd = pathmap_open(newlib->name)) < 0) {

          print_debug("can't open shared object %s\n", newlib->name);

          free(newlib);

          return NULL;

       }

    } else {

       newlib->fd = fd;

    }

    // check whether we have got an ELF file. /proc/<pid>/map

    // gives out all file mappings and not just shared objects

    if (is_elf_file(newlib->fd) == false) {

       close(newlib->fd);

       free(newlib);

       return NULL;

    }

    newlib->symtab = build_symtab(newlib->fd, libname);

    if (newlib->symtab == NULL) {

       print_debug("symbol table build failed for %s\n", newlib->name);

    }

    // even if symbol table building fails, we add the lib_info.

    // This is because we may need to read from the ELF file for core file

    // address read functionality. lookup_symbol checks for NULL symtab.

    if (ph->libs) {

       ph->lib_tail->next = newlib;

       ph->lib_tail = newlib;

    }  else {

       ph->libs = ph->lib_tail = newlib;

    }

    ph->num_libs++;

    return newlib;

 }

 // lookup for a specific symbol

 uintptr_t lookup_symbol(struct ps_prochandle* ph,  const char* object_name,

                        const char* sym_name) {

    // ignore object_name. search in all libraries

    // FIXME: what should we do with object_name?? The library names are obtained

    // by parsing /proc/<pid>/maps, which may not be the same as object_name.

    // What we need is a utility to map object_name to real file name, something

    // dlopen() does by looking at LD_LIBRARY_PATH and /etc/ld.so.cache. For

    // now, we just ignore object_name and do a global search for the symbol.

    lib_info* lib = ph->libs;

    while (lib) {

       if (lib->symtab) {

          uintptr_t res = search_symbol(lib->symtab, lib->base, sym_name, NULL);

          if (res) return res;

       }

       lib = lib->next;

    }

    print_debug("lookup failed for symbol '%s' in obj '%s'\n",

                           sym_name, object_name);

    return (uintptr_t) NULL;

 }

 const char* symbol_for_pc(struct ps_prochandle* ph, uintptr_t addr, uintptr_t* poffset) {

    const char* res = NULL;

    lib_info* lib = ph->libs;

    while (lib) {

       if (lib->symtab && addr >= lib->base) {

          res = nearest_symbol(lib->symtab, addr - lib->base, poffset);

          if (res) return res;

       }

       lib = lib->next;

    }

    return NULL;

 }

 // add a thread to ps_prochandle

 thread_info* add_thread_info(struct ps_prochandle* ph, pthread_t pthread_id, lwpid_t lwp_id) {

    thread_info* newthr;

    if ( (newthr = (thread_info*) calloc(1, sizeof(thread_info))) == NULL) {

       print_debug("can't allocate memory for thread_info\n");

       return NULL;

    }

    // initialize thread info

    newthr->pthread_id = pthread_id;

    newthr->lwp_id = lwp_id;

    // add new thread to the list

    newthr->next = ph->threads;

    ph->threads = newthr;

    ph->num_threads++;

    return newthr;

 }

 // struct used for client data from thread_db callback

 struct thread_db_client_data {

    struct ps_prochandle* ph;

    thread_info_callback callback;

 };

 // callback function for libthread_db

 static int thread_db_callback(const td_thrhandle_t *th_p, void *data) {

   struct thread_db_client_data* ptr = (struct thread_db_client_data*) data;

   td_thrinfo_t ti;

   td_err_e err;

   memset(&ti, 0, sizeof(ti));

   err = td_thr_get_info(th_p, &ti);

   if (err != TD_OK) {

     print_debug("libthread_db : td_thr_get_info failed, can't get thread info\n");

     return err;

   }

   print_debug("thread_db : pthread %d (lwp %d)\n", ti.ti_tid, ti.ti_lid);

   if (ptr->callback(ptr->ph, ti.ti_tid, ti.ti_lid) != true)

     return TD_ERR;

   return TD_OK;

 }

 // read thread_info using libthread_db

 bool read_thread_info(struct ps_prochandle* ph, thread_info_callback cb) {

   struct thread_db_client_data mydata;

   td_thragent_t* thread_agent = NULL;

   if (td_ta_new(ph, &thread_agent) != TD_OK) {

      print_debug("can't create libthread_db agent\n");

      return false;

   }

   mydata.ph = ph;

   mydata.callback = cb;

   // we use libthread_db iterator to iterate thru list of threads.

   if (td_ta_thr_iter(thread_agent, thread_db_callback, &mydata,

                  TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY,

                  TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS) != TD_OK) {

      td_ta_delete(thread_agent);

      return false;

   }

   // delete thread agent

   td_ta_delete(thread_agent);

   return true;

 }

 // get number of threads

 int get_num_threads(struct ps_prochandle* ph) {

    return ph->num_threads;

 }

 // get lwp_id of n'th thread

 lwpid_t get_lwp_id(struct ps_prochandle* ph, int index) {

    int count = 0;

    thread_info* thr = ph->threads;

    while (thr) {

       if (count == index) {

          return thr->lwp_id;

       }

       count++;

       thr = thr->next;

    }

    return -1;

 }

 // get regs for a given lwp

 bool get_lwp_regs(struct ps_prochandle* ph, lwpid_t lwp_id, struct user_regs_struct* regs) {

   return ph->ops->get_lwp_regs(ph, lwp_id, regs);

 }

 // get number of shared objects

 int get_num_libs(struct ps_prochandle* ph) {

    return ph->num_libs;

 }

 // get name of n'th solib

 const char* get_lib_name(struct ps_prochandle* ph, int index) {

    int count = 0;

    lib_info* lib = ph->libs;

    while (lib) {

       if (count == index) {

          return lib->name;

       }

       count++;

       lib = lib->next;

    }

    return NULL;

 }

 // get base address of a lib

 uintptr_t get_lib_base(struct ps_prochandle* ph, int index) {

    int count = 0;

    lib_info* lib = ph->libs;

    while (lib) {

       if (count == index) {

          return lib->base;

       }

       count++;

       lib = lib->next;

    }

    return (uintptr_t)NULL;

 }

 bool find_lib(struct ps_prochandle* ph, const char *lib_name) {

   lib_info *p = ph->libs;

   while (p) {

     if (strcmp(p->name, lib_name) == 0) {

       return true;

     }

     p = p->next;

   }

   return false;

 }

 //--------------------------------------------------------------------------

 // proc service functions

 // get process id

 pid_t ps_getpid(struct ps_prochandle *ph) {

    return ph->pid;

 }

 // ps_pglobal_lookup() looks up the symbol sym_name in the symbol table

 // of the load object object_name in the target process identified by ph.

 // It returns the symbol's value as an address in the target process in

 // *sym_addr.

 ps_err_e ps_pglobal_lookup(struct ps_prochandle *ph, const char *object_name,

                     const char *sym_name, psaddr_t *sym_addr) {

   *sym_addr = (psaddr_t) lookup_symbol(ph, object_name, sym_name);

   return (*sym_addr ? PS_OK : PS_NOSYM);

 }

 // read "size" bytes info "buf" from address "addr"

 ps_err_e ps_pdread(struct ps_prochandle *ph, psaddr_t  addr,

                    void *buf, size_t size) {

   return ph->ops->p_pread(ph, (uintptr_t) addr, buf, size)? PS_OK: PS_ERR;

 }

 // write "size" bytes of data to debuggee at address "addr"

 ps_err_e ps_pdwrite(struct ps_prochandle *ph, psaddr_t addr,

                     const void *buf, size_t size) {

   return ph->ops->p_pwrite(ph, (uintptr_t)addr, buf, size)? PS_OK: PS_ERR;

 }

 // ------------------------------------------------------------------------

 // Functions below this point are not yet implemented. They are here only

 // to make the linker happy.

 ps_err_e ps_lsetfpregs(struct ps_prochandle *ph, lwpid_t lid, const prfpregset_t *fpregs) {

   print_debug("ps_lsetfpregs not implemented\n");

   return PS_OK;

 }

 ps_err_e ps_lsetregs(struct ps_prochandle *ph, lwpid_t lid, const prgregset_t gregset) {

   print_debug("ps_lsetregs not implemented\n");

   return PS_OK;

 }

 ps_err_e  ps_lgetfpregs(struct  ps_prochandle  *ph,  lwpid_t lid, prfpregset_t *fpregs) {

   print_debug("ps_lgetfpregs not implemented\n");

   return PS_OK;

 }

 ps_err_e ps_lgetregs(struct ps_prochandle *ph, lwpid_t lid, prgregset_t gregset) {

   print_debug("ps_lgetfpregs not implemented\n");

   return PS_OK;

 }

 // new libthread_db of NPTL seem to require this symbol

 ps_err_e ps_get_thread_area() {

   print_debug("ps_get_thread_area not implemented\n");

   return PS_OK;

 }