usr.bin/objformat/objformat.c

   1 /*-
   2  * Copyright (c) 2004, The DragonFly Project.  All rights reserved.
   3  * Copyright (c) 1998, Peter Wemm <peter@netplex.com.au>
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  *
  27  * $FreeBSD: src/usr.bin/objformat/objformat.c,v 1.6 1998/10/24 02:01:30 jdp Exp $
  28  */
  29
  30 #include <sys/param.h>
  31
  32 #include <err.h>
  33 #include <objformat.h>
  34 #include <stdio.h>
  35 #include <stdlib.h>
  36 #include <string.h>
  37 #include <unistd.h>
  38
  39 #ifndef CCVER_DEFAULT
  40 #define CCVER_DEFAULT "gcc80"
  41 #endif
  42
  43 #ifndef BINUTILSVER_DEFAULT
  44 #define BINUTILSVER_DEFAULT "binutils234"
  45 #endif
  46
  47 #define LINKER_BFD     "ld.bfd"
  48 #define LINKER_GOLD    "ld.gold"
  49 #define LINKER_DEFAULT LINKER_GOLD
  50 #define LINKER_ALT     LINKER_BFD
  51
  52 #ifndef OBJFORMAT_PATH_DEFAULT
  53 #define OBJFORMAT_PATH_DEFAULT ""
  54 #endif
  55
  56 /* Macro for array size */
  57 #ifndef NELEM
  58 #define NELEM(ary)      (sizeof(ary) / sizeof((ary)[0]))
  59 #endif
  60
  61 enum cmd_type { OBJFORMAT, COMPILER, BINUTILS, LINKER };
  62
  63 struct command {
  64         const char *cmd;
  65         enum cmd_type type;
  66 };
  67
  68 static struct command commands[] = {
  69         {"CC",                  COMPILER},
  70         {"c++",                 COMPILER},
  71         {"cc",                  COMPILER},
  72         {"cpp",                 COMPILER},
  73         {"g++",                 COMPILER},
  74         {"gcc",                 COMPILER},
  75         {"gcov",                COMPILER},
  76         {"ld",                  LINKER},
  77         {"addr2line",           BINUTILS},
  78         {"ar",                  BINUTILS},
  79         {"as",                  BINUTILS},
  80         {"c++filt",             BINUTILS},
  81         {"elfedit",             BINUTILS},
  82         {"gprof",               BINUTILS},
  83         {"ld.bfd",              BINUTILS},
  84         {"ld.gold",             BINUTILS},
  85         {"nm",                  BINUTILS},
  86         {"objcopy",             BINUTILS},
  87         {"objdump",             BINUTILS},
  88         {"ranlib",              BINUTILS},
  89         {"readelf",             BINUTILS},
  90         {"size",                BINUTILS},
  91         {"strings",             BINUTILS},
  92         {"strip",               BINUTILS},
  93         {"objformat",           OBJFORMAT},
  94         {"",                    -1}
  95 };
  96
  97 int
  98 main(int argc, char **argv)
  99 {
 100         char ld_def[] = LINKER_DEFAULT;
 101         char ld_alt[] = LINKER_ALT;
 102         struct command *cmds;
 103         char objformat[32];
 104         char *path, *chunk;
 105         char *cmd, *newcmd = NULL;
 106         char *ldcmd = ld_def;
 107         const char *objformat_path;
 108         const char *ccver;
 109         const char *buver;
 110         const char *ldver;
 111         const char *env_value = NULL;
 112         const char *base_path = NULL;
 113         int use_objformat = 0;
 114
 115         if (getobjformat(objformat, sizeof objformat, &argc, argv) == -1)
 116                 errx(1, "Invalid object format");
 117
 118         /*
 119          * Get the last path element of the program name being executed
 120          */
 121         cmd = strrchr(argv[0], '/');
 122         if (cmd != NULL)
 123                 cmd++;
 124         else
 125                 cmd = argv[0];
 126
 127         for (cmds = commands; cmds < &commands[NELEM(commands) - 1]; ++cmds) {
 128                 if (strcmp(cmd, cmds->cmd) == 0)
 129                         break;
 130         }
 131
 132         if (cmds) {
 133                 switch (cmds->type) {
 134                 case COMPILER:
 135                         ccver = getenv("CCVER");
 136                         if ((ccver == NULL) || ccver[0] == 0)
 137                             ccver = CCVER_DEFAULT;
 138                         base_path = "/usr/libexec";
 139                         use_objformat = 0;
 140                         env_value = ccver;
 141                         break;
 142                 case BINUTILS:
 143                         buver = getenv("BINUTILSVER");
 144                         if (buver == NULL)
 145                             buver = BINUTILSVER_DEFAULT;
 146                         base_path = "/usr/libexec";
 147                         use_objformat = 1;
 148                         env_value = buver;
 149                         break;
 150                 case LINKER:
 151                         buver = getenv("BINUTILSVER");
 152                         if (buver == NULL)
 153                             buver = BINUTILSVER_DEFAULT;
 154                         ldver = getenv("LDVER");
 155                         if ((ldver != NULL) && (strcmp(ldver, ld_alt) == 0))
 156                             ldcmd = ld_alt;
 157                         base_path = "/usr/libexec";
 158                         use_objformat = 1;
 159                         env_value = buver;
 160                         cmd = ldcmd;
 161                         break;
 162                 case OBJFORMAT:
 163                         break;
 164                 default:
 165                         errx(1, "unknown command type");
 166                         break;
 167                 }
 168         }
 169
 170         /*
 171          * The objformat command itself doesn't need another exec
 172          */
 173         if (cmds->type == OBJFORMAT) {
 174                 if (argc != 1) {
 175                         fprintf(stderr, "Usage: objformat\n");
 176                         exit(1);
 177                 }
 178
 179                 printf("%s\n", objformat);
 180                 exit(0);
 181         }
 182
 183         /*
 184          * make buildworld glue and CCVER overrides.
 185          */
 186         objformat_path = getenv("OBJFORMAT_PATH");
 187         if (objformat_path == NULL)
 188                 objformat_path = OBJFORMAT_PATH_DEFAULT;
 189
 190 again:
 191         path = strdup(objformat_path);
 192
 193         if (setenv("OBJFORMAT", objformat, 1) == -1)
 194                 err(1, "setenv: cannot set OBJFORMAT=%s", objformat);
 195
 196         /*
 197          * objformat_path could be sequence of colon-separated paths.
 198          */
 199         while ((chunk = strsep(&path, ":")) != NULL) {
 200                 if (newcmd != NULL) {
 201                         free(newcmd);
 202                         newcmd = NULL;
 203                 }
 204                 if (use_objformat) {
 205                         asprintf(&newcmd, "%s%s/%s/%s/%s",
 206                                 chunk, base_path, env_value, objformat, cmd);
 207                 } else {
 208                         asprintf(&newcmd, "%s%s/%s/%s",
 209                                 chunk, base_path, env_value, cmd);
 210                 }
 211                 if (newcmd == NULL)
 212                         err(1, "cannot allocate memory");
 213
 214                 argv[0] = newcmd;
 215                 execv(newcmd, argv);
 216         }
 217
 218         /*
 219          * Fallback:  if we're searching for a compiler, but didn't
 220          * find any, try again using the custom compiler driver.
 221          */
 222         if (cmds && cmds->type == COMPILER &&
 223             strcmp(env_value, "custom") != 0) {
 224                 env_value = "custom";
 225                 goto again;
 226         }
 227
 228         if (use_objformat) {
 229                 err(1, "in path [%s]%s/%s/%s/%s",
 230                         objformat_path, base_path, env_value, objformat, cmd);
 231         } else {
 232                 err(1, "in path [%s]%s/%s/%s",
 233                         objformat_path, base_path, env_value, cmd);
 234         }
 235 }