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 /*

  * 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 "libproc_impl.h"

 static const char* alt_root = NULL;

 static int alt_root_len = -1;

 #define SA_ALTROOT "SA_ALTROOT"

 off_t ltell(int fd) {

   return lseek(fd, 0, SEEK_CUR);

 }

 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;

 }

 #ifdef __APPLE__

 // get arch offset in file

 bool get_arch_off(int fd, cpu_type_t cputype, off_t *offset) {

   struct fat_header fatheader;

   struct fat_arch fatarch;

   off_t img_start = 0;

   off_t pos = ltell(fd);

   if (read(fd, (void *)&fatheader, sizeof(struct fat_header)) != sizeof(struct fat_header)) {

     return false;

   }

   if (fatheader.magic == FAT_CIGAM) {

     int i;

     for (i = 0; i < ntohl(fatheader.nfat_arch); i++) {

       if (read(fd, (void *)&fatarch, sizeof(struct fat_arch)) != sizeof(struct fat_arch)) {

         return false;

       }

       if (ntohl(fatarch.cputype) == cputype) {

         print_debug("fat offset=%x\n", ntohl(fatarch.offset));

         img_start = ntohl(fatarch.offset);

         break;

       }

     }

     if (img_start == 0) {

       return false;

     }

   }

   lseek(fd, pos, SEEK_SET);

   *offset = img_start;

   return true;

 }

 bool is_macho_file(int fd) {

   mach_header_64 fhdr;

   off_t x86_64_off;

   if (fd < 0) {

     print_debug("Invalid file handle passed to is_macho_file\n");

     return false;

   }

   off_t pos = ltell(fd);

   // check fat header

   if (!get_arch_off(fd, CPU_TYPE_X86_64, &x86_64_off)) {

     print_debug("failed to get fat header\n");

     return false;

   }

   lseek(fd, x86_64_off, SEEK_SET);

   if (read(fd, (void *)&fhdr, sizeof(mach_header_64)) != sizeof(mach_header_64)) {

      return false;

   }

   lseek(fd, pos, SEEK_SET);               // restore

   print_debug("fhdr.magic %x\n", fhdr.magic);

   return (fhdr.magic == MH_MAGIC_64 || fhdr.magic == MH_CIGAM_64);

 }

 #endif //__APPLE__

 // initialize libproc

 bool init_libproc(bool debug) {

    _libsaproc_debug = debug;

 #ifndef __APPLE__

    // initialize the thread_db library

    if (td_init() != TD_OK) {

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

      return false;

    }

 #endif // __APPLE__

    return true;

 }

 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;

   }

 }

 void destroy_thread_info(struct ps_prochandle* ph) {

   sa_thread_info* thr = ph->threads;

   while (thr) {

     sa_thread_info* n = thr->next;

     free(thr);

     thr = n;

   }

 }

 // 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;

   print_debug("add_lib_info_fd %s\n", libname);

   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;

   }

 #ifdef __APPLE__

   // check whether we have got an Macho file.

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

     close(newlib->fd);

     free(newlib);

     print_debug("not a mach-o file\n");

     return NULL;

   }

 #else

   // 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;

   }

 #endif // __APPLE__

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

   if (newlib->symtab == NULL) {

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

   } else {

     print_debug("built symbol table 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 or MachO 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

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

   sa_thread_info* newthr;

   if ( (newthr = (sa_thread_info*) calloc(1, sizeof(sa_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;

 }

 #ifndef __APPLE__

 // 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, (pthread_t)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;

 }

 #endif // __APPLE__

 // 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;

   sa_thread_info* thr = ph->threads;

   while (thr) {

     if (count == index) {

       return thr->lwp_id;

     }

     count++;

     thr = thr->next;

   }

   return 0;

 }

 #ifdef __APPLE__

 // set lwp_id of n'th thread

 bool set_lwp_id(struct ps_prochandle* ph, int index, lwpid_t lwpid) {

   int count = 0;

   sa_thread_info* thr = ph->threads;

   while (thr) {

     if (count == index) {

       thr->lwp_id = lwpid;

       return true;

     }

     count++;

     thr = thr->next;

   }

   return false;

 }

 // get regs of n-th thread, only used in fillThreads the first time called

 bool get_nth_lwp_regs(struct ps_prochandle* ph, int index, struct reg* regs) {

   int count = 0;

   sa_thread_info* thr = ph->threads;

   while (thr) {

     if (count == index) {

       break;

     }

     count++;

     thr = thr->next;

   }

   if (thr != NULL) {

     memcpy(regs, &thr->regs, sizeof(struct reg));

     return true;

   }

   return false;

 }

 #endif // __APPLE__

 // get regs for a given lwp

 bool get_lwp_regs(struct ps_prochandle* ph, lwpid_t lwp_id, struct reg* 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

 // 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_pread(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_pwrite(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;

 }

 // fill in ptrace_lwpinfo for lid

 ps_err_e ps_linfo(struct ps_prochandle *ph, lwpid_t lwp_id, void *linfo) {

   return ph->ops->get_lwp_info(ph, lwp_id, linfo)? PS_OK: PS_ERR;

 }

 // needed for when libthread_db is compiled with TD_DEBUG defined

 void

 ps_plog (const char *format, ...)

 {

   va_list alist;

   va_start(alist, format);

   vfprintf(stderr, format, alist);

   va_end(alist);

 }

 #ifndef __APPLE__

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

 // 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;

 }

 ps_err_e ps_lstop(struct ps_prochandle *ph, lwpid_t lid) {

   print_debug("ps_lstop not implemented\n");

   return PS_OK;

 }

 ps_err_e ps_pcontinue(struct ps_prochandle *ph) {

   print_debug("ps_pcontinue not implemented\n");

   return PS_OK;

 }

 #endif // __APPLE__