1 /* Native-dependent code for FreeBSD. 2 3 Copyright (C) 2002-2013 Free Software Foundation, Inc. 4 5 This file is part of GDB. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 19 20 #include "defs.h" 21 #include "gdbcore.h" 22 #include "inferior.h" 23 #include "regcache.h" 24 #include "regset.h" 25 #include "gdbthread.h" 26 27 #include "gdb_assert.h" 28 #include "gdb_string.h" 29 #include <sys/types.h> 30 #include <sys/procfs.h> 31 #include <sys/sysctl.h> 32 33 #include "elf-bfd.h" 34 #include "fbsd-nat.h" 35 36 /* Return the name of a file that can be opened to get the symbols for 37 the child process identified by PID. */ 38 39 char * 40 fbsd_pid_to_exec_file (int pid) 41 { 42 size_t len = MAXPATHLEN; 43 char *buf = xcalloc (len, sizeof (char)); 44 char *path; 45 46 #ifdef KERN_PROC_PATHNAME 47 int mib[4]; 48 49 mib[0] = CTL_KERN; 50 mib[1] = KERN_PROC; 51 mib[2] = KERN_PROC_PATHNAME; 52 mib[3] = pid; 53 if (sysctl (mib, 4, buf, &len, NULL, 0) == 0) 54 return buf; 55 #endif 56 57 path = xstrprintf ("/proc/%d/file", pid); 58 if (readlink (path, buf, MAXPATHLEN - 1) == -1) 59 { 60 xfree (buf); 61 buf = NULL; 62 } 63 64 xfree (path); 65 return buf; 66 } 67 68 static int 69 fbsd_read_mapping (FILE *mapfile, unsigned long *start, unsigned long *end, 70 char *protection) 71 { 72 /* FreeBSD 5.1-RELEASE uses a 256-byte buffer. */ 73 char buf[256]; 74 int resident, privateresident; 75 unsigned long obj; 76 int ret = EOF; 77 78 /* As of FreeBSD 5.0-RELEASE, the layout is described in 79 /usr/src/sys/fs/procfs/procfs_map.c. Somewhere in 5.1-CURRENT a 80 new column was added to the procfs map. Therefore we can't use 81 fscanf since we need to support older releases too. */ 82 if (fgets (buf, sizeof buf, mapfile) != NULL) 83 ret = sscanf (buf, "%lx %lx %d %d %lx %s", start, end, 84 &resident, &privateresident, &obj, protection); 85 86 return (ret != 0 && ret != EOF); 87 } 88 89 /* Iterate over all the memory regions in the current inferior, 90 calling FUNC for each memory region. OBFD is passed as the last 91 argument to FUNC. */ 92 93 int 94 fbsd_find_memory_regions (find_memory_region_ftype func, void *obfd) 95 { 96 pid_t pid = ptid_get_pid (inferior_ptid); 97 char *mapfilename; 98 FILE *mapfile; 99 unsigned long start, end, size; 100 char protection[4]; 101 int read, write, exec; 102 struct cleanup *cleanup; 103 104 mapfilename = xstrprintf ("/proc/%ld/map", (long) pid); 105 cleanup = make_cleanup (xfree, mapfilename); 106 mapfile = fopen (mapfilename, "r"); 107 if (mapfile == NULL) 108 error (_("Couldn't open %s."), mapfilename); 109 make_cleanup_fclose (mapfile); 110 111 if (info_verbose) 112 fprintf_filtered (gdb_stdout, 113 "Reading memory regions from %s\n", mapfilename); 114 115 /* Now iterate until end-of-file. */ 116 while (fbsd_read_mapping (mapfile, &start, &end, &protection[0])) 117 { 118 size = end - start; 119 120 read = (strchr (protection, 'r') != 0); 121 write = (strchr (protection, 'w') != 0); 122 exec = (strchr (protection, 'x') != 0); 123 124 if (info_verbose) 125 { 126 fprintf_filtered (gdb_stdout, 127 "Save segment, %ld bytes at %s (%c%c%c)\n", 128 size, paddress (target_gdbarch (), start), 129 read ? 'r' : '-', 130 write ? 'w' : '-', 131 exec ? 'x' : '-'); 132 } 133 134 /* Invoke the callback function to create the corefile segment. 135 Pass MODIFIED as true, we do not know the real modification state. */ 136 func (start, size, read, write, exec, 1, obfd); 137 } 138 139 do_cleanups (cleanup); 140 return 0; 141 } 142 143 static int 144 find_signalled_thread (struct thread_info *info, void *data) 145 { 146 if (info->suspend.stop_signal != GDB_SIGNAL_0 147 && ptid_get_pid (info->ptid) == ptid_get_pid (inferior_ptid)) 148 return 1; 149 150 return 0; 151 } 152 153 static enum gdb_signal 154 find_stop_signal (void) 155 { 156 struct thread_info *info = 157 iterate_over_threads (find_signalled_thread, NULL); 158 159 if (info) 160 return info->suspend.stop_signal; 161 else 162 return GDB_SIGNAL_0; 163 } 164 165 /* Create appropriate note sections for a corefile, returning them in 166 allocated memory. */ 167 168 char * 169 fbsd_make_corefile_notes (bfd *obfd, int *note_size) 170 { 171 const struct regcache *regcache = get_current_regcache (); 172 struct gdbarch *gdbarch = get_regcache_arch (regcache); 173 gregset_t gregs; 174 fpregset_t fpregs; 175 char *note_data = NULL; 176 Elf_Internal_Ehdr *i_ehdrp; 177 const struct regset *regset; 178 size_t size; 179 180 /* Put a "FreeBSD" label in the ELF header. */ 181 i_ehdrp = elf_elfheader (obfd); 182 i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_FREEBSD; 183 184 gdb_assert (gdbarch_regset_from_core_section_p (gdbarch)); 185 186 size = sizeof gregs; 187 regset = gdbarch_regset_from_core_section (gdbarch, ".reg", size); 188 gdb_assert (regset && regset->collect_regset); 189 regset->collect_regset (regset, regcache, -1, &gregs, size); 190 191 note_data = elfcore_write_prstatus (obfd, note_data, note_size, 192 ptid_get_pid (inferior_ptid), 193 find_stop_signal (), &gregs); 194 195 size = sizeof fpregs; 196 regset = gdbarch_regset_from_core_section (gdbarch, ".reg2", size); 197 gdb_assert (regset && regset->collect_regset); 198 regset->collect_regset (regset, regcache, -1, &fpregs, size); 199 200 note_data = elfcore_write_prfpreg (obfd, note_data, note_size, 201 &fpregs, sizeof (fpregs)); 202 203 if (get_exec_file (0)) 204 { 205 const char *fname = lbasename (get_exec_file (0)); 206 char *psargs = xstrdup (fname); 207 208 if (get_inferior_args ()) 209 psargs = reconcat (psargs, psargs, " ", get_inferior_args (), 210 (char *) NULL); 211 212 note_data = elfcore_write_prpsinfo (obfd, note_data, note_size, 213 fname, psargs); 214 } 215 216 make_cleanup (xfree, note_data); 217 return note_data; 218 } 219