jdk8-mips64-public/hotspot: agent/src/os/bsd/libproc

agent/src/os/bsd/libproc_impl.c@fd44df5e3bc3 (annotated)

agent/src/os/bsd/libproc_impl.c

Wed, 14 Oct 2020 17:44:48 +0800

author: aoqi
date: Wed, 14 Oct 2020 17:44:48 +0800
changeset 9931: fd44df5e3bc3
parent 6876: 710a3c8b516e
parent 9920: 3a3803a0c789
permissions: -rw-r--r--

Merge

 /*
  * 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;
   }
   if (strlen(libname) >= sizeof(newlib->name)) {
     print_debug("libname %s too long\n", libname);
     return NULL;
   }
   strcpy(newlib->name, libname);
   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__

Mercurial > jdk8-mips64-public > hotspot / annotate

agent/src/os/bsd/libproc_impl.c@fd44df5e3bc3 (annotated)

agent/src/os/bsd/libproc_impl.c