| 1 | /* FreeBSD-specific methods for using the /proc file system. |
| 2 | |
| 3 | Copyright 2002, 2003 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 2 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, write to the Free Software |
| 19 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 20 | Boston, MA 02111-1307, USA. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "gdbcore.h" |
| 24 | #include "inferior.h" |
| 25 | #include "gdb_string.h" |
| 26 | |
| 27 | #include <sys/procfs.h> |
| 28 | #include <sys/types.h> |
| 29 | |
| 30 | #include "elf-bfd.h" |
| 31 | |
| 32 | #include "gregset.h" |
| 33 | |
| 34 | char * |
| 35 | child_pid_to_exec_file (int pid) |
| 36 | { |
| 37 | char *path; |
| 38 | char *buf; |
| 39 | |
| 40 | xasprintf (&path, "/proc/%d/file", pid); |
| 41 | buf = xcalloc (MAXPATHLEN, sizeof (char)); |
| 42 | make_cleanup (xfree, path); |
| 43 | make_cleanup (xfree, buf); |
| 44 | |
| 45 | if (readlink (path, buf, MAXPATHLEN) > 0) |
| 46 | return buf; |
| 47 | |
| 48 | return NULL; |
| 49 | } |
| 50 | |
| 51 | static int |
| 52 | read_mapping (FILE *mapfile, unsigned long *start, unsigned long *end, |
| 53 | char *protection) |
| 54 | { |
| 55 | /* FreeBSD 5.1-RELEASE uses a 256-byte buffer. */ |
| 56 | char buf[256]; |
| 57 | int resident, privateresident; |
| 58 | unsigned long obj; |
| 59 | int ret = EOF; |
| 60 | |
| 61 | /* As of FreeBSD 5.0-RELEASE, the layout is described in |
| 62 | /usr/src/sys/fs/procfs/procfs_map.c. Somewhere in 5.1-CURRENT a |
| 63 | new column was added to the procfs map. Therefore we can't use |
| 64 | fscanf since we need to support older releases too. */ |
| 65 | if (fgets (buf, sizeof buf, mapfile) != NULL) |
| 66 | ret = sscanf (buf, "%lx %lx %d %d %lx %s", start, end, |
| 67 | &resident, &privateresident, &obj, protection); |
| 68 | |
| 69 | return (ret != 0 && ret != EOF); |
| 70 | } |
| 71 | |
| 72 | static int |
| 73 | fbsd_find_memory_regions (int (*func) (CORE_ADDR, unsigned long, |
| 74 | int, int, int, void *), |
| 75 | void *obfd) |
| 76 | { |
| 77 | pid_t pid = ptid_get_pid (inferior_ptid); |
| 78 | char *mapfilename; |
| 79 | FILE *mapfile; |
| 80 | unsigned long start, end, size; |
| 81 | char protection[4]; |
| 82 | int read, write, exec; |
| 83 | |
| 84 | xasprintf (&mapfilename, "/proc/%ld/map", (long) pid); |
| 85 | mapfile = fopen (mapfilename, "r"); |
| 86 | if (mapfile == NULL) |
| 87 | error ("Couldn't open %s\n", mapfilename); |
| 88 | |
| 89 | if (info_verbose) |
| 90 | fprintf_filtered (gdb_stdout, |
| 91 | "Reading memory regions from %s\n", mapfilename); |
| 92 | |
| 93 | /* Now iterate until end-of-file. */ |
| 94 | while (read_mapping (mapfile, &start, &end, &protection[0])) |
| 95 | { |
| 96 | size = end - start; |
| 97 | |
| 98 | read = (strchr (protection, 'r') != 0); |
| 99 | write = (strchr (protection, 'w') != 0); |
| 100 | exec = (strchr (protection, 'x') != 0); |
| 101 | |
| 102 | if (info_verbose) |
| 103 | { |
| 104 | fprintf_filtered (gdb_stdout, |
| 105 | "Save segment, %ld bytes at 0x%s (%c%c%c)\n", |
| 106 | size, paddr_nz (start), |
| 107 | read ? 'r' : '-', |
| 108 | write ? 'w' : '-', |
| 109 | exec ? 'x' : '-'); |
| 110 | } |
| 111 | |
| 112 | /* Invoke the callback function to create the corefile segment. */ |
| 113 | func (start, size, read, write, exec, obfd); |
| 114 | } |
| 115 | |
| 116 | fclose (mapfile); |
| 117 | return 0; |
| 118 | } |
| 119 | |
| 120 | static char * |
| 121 | fbsd_make_corefile_notes (bfd *obfd, int *note_size) |
| 122 | { |
| 123 | gregset_t gregs; |
| 124 | fpregset_t fpregs; |
| 125 | char *note_data = NULL; |
| 126 | Elf_Internal_Ehdr *i_ehdrp; |
| 127 | |
| 128 | /* Put a "FreeBSD" label in the ELF header. */ |
| 129 | i_ehdrp = elf_elfheader (obfd); |
| 130 | i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_FREEBSD; |
| 131 | |
| 132 | fill_gregset (&gregs, -1); |
| 133 | note_data = elfcore_write_prstatus (obfd, note_data, note_size, |
| 134 | ptid_get_pid (inferior_ptid), |
| 135 | stop_signal, &gregs); |
| 136 | |
| 137 | fill_fpregset (&fpregs, -1); |
| 138 | note_data = elfcore_write_prfpreg (obfd, note_data, note_size, |
| 139 | &fpregs, sizeof (fpregs)); |
| 140 | |
| 141 | if (get_exec_file (0)) |
| 142 | { |
| 143 | char *fname = strrchr (get_exec_file (0), '/') + 1; |
| 144 | char *psargs = xstrdup (fname); |
| 145 | |
| 146 | if (get_inferior_args ()) |
| 147 | psargs = reconcat (psargs, psargs, " ", get_inferior_args (), NULL); |
| 148 | |
| 149 | note_data = elfcore_write_prpsinfo (obfd, note_data, note_size, |
| 150 | fname, psargs); |
| 151 | } |
| 152 | |
| 153 | make_cleanup (xfree, note_data); |
| 154 | return note_data; |
| 155 | } |
| 156 | \f |
| 157 | |
| 158 | void |
| 159 | _initialize_fbsd_proc (void) |
| 160 | { |
| 161 | extern void inftarg_set_find_memory_regions (); |
| 162 | extern void inftarg_set_make_corefile_notes (); |
| 163 | |
| 164 | inftarg_set_find_memory_regions (fbsd_find_memory_regions); |
| 165 | inftarg_set_make_corefile_notes (fbsd_make_corefile_notes); |
| 166 | } |