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Linux/scripts/dtc/dtc.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  * (C) Copyright David Gibson <dwg@au1.ibm.com>, IBM Corporation.  2005.
  4  */
  5 
  6 #include <sys/stat.h>
  7 
  8 #include "dtc.h"
  9 #include "srcpos.h"
 10 
 11 /*
 12  * Command line options
 13  */
 14 int quiet;              /* Level of quietness */
 15 int reservenum;         /* Number of memory reservation slots */
 16 int minsize;            /* Minimum blob size */
 17 int padsize;            /* Additional padding to blob */
 18 int alignsize;          /* Additional padding to blob accroding to the alignsize */
 19 int phandle_format = PHANDLE_EPAPR;     /* Use linux,phandle or phandle properties */
 20 int generate_symbols;   /* enable symbols & fixup support */
 21 int generate_fixups;            /* suppress generation of fixups on symbol support */
 22 int auto_label_aliases;         /* auto generate labels -> aliases */
 23 int annotate;           /* Level of annotation: 1 for input source location
 24                            >1 for full input source location. */
 25 
 26 static int is_power_of_2(int x)
 27 {
 28         return (x > 0) && ((x & (x - 1)) == 0);
 29 }
 30 
 31 static void fill_fullpaths(struct node *tree, const char *prefix)
 32 {
 33         struct node *child;
 34         const char *unit;
 35 
 36         tree->fullpath = join_path(prefix, tree->name);
 37 
 38         unit = strchr(tree->name, '@');
 39         if (unit)
 40                 tree->basenamelen = unit - tree->name;
 41         else
 42                 tree->basenamelen = strlen(tree->name);
 43 
 44         for_each_child(tree, child)
 45                 fill_fullpaths(child, tree->fullpath);
 46 }
 47 
 48 /* Usage related data. */
 49 static const char usage_synopsis[] = "dtc [options] <input file>";
 50 static const char usage_short_opts[] = "qI:O:o:V:d:R:S:p:a:fb:i:H:sW:E:@AThv";
 51 static struct option const usage_long_opts[] = {
 52         {"quiet",            no_argument, NULL, 'q'},
 53         {"in-format",         a_argument, NULL, 'I'},
 54         {"out",               a_argument, NULL, 'o'},
 55         {"out-format",        a_argument, NULL, 'O'},
 56         {"out-version",       a_argument, NULL, 'V'},
 57         {"out-dependency",    a_argument, NULL, 'd'},
 58         {"reserve",           a_argument, NULL, 'R'},
 59         {"space",             a_argument, NULL, 'S'},
 60         {"pad",               a_argument, NULL, 'p'},
 61         {"align",             a_argument, NULL, 'a'},
 62         {"boot-cpu",          a_argument, NULL, 'b'},
 63         {"force",            no_argument, NULL, 'f'},
 64         {"include",           a_argument, NULL, 'i'},
 65         {"sort",             no_argument, NULL, 's'},
 66         {"phandle",           a_argument, NULL, 'H'},
 67         {"warning",           a_argument, NULL, 'W'},
 68         {"error",             a_argument, NULL, 'E'},
 69         {"symbols",          no_argument, NULL, '@'},
 70         {"auto-alias",       no_argument, NULL, 'A'},
 71         {"annotate",         no_argument, NULL, 'T'},
 72         {"help",             no_argument, NULL, 'h'},
 73         {"version",          no_argument, NULL, 'v'},
 74         {NULL,               no_argument, NULL, 0x0},
 75 };
 76 static const char * const usage_opts_help[] = {
 77         "\n\tQuiet: -q suppress warnings, -qq errors, -qqq all",
 78         "\n\tInput formats are:\n"
 79          "\t\tdts - device tree source text\n"
 80          "\t\tdtb - device tree blob\n"
 81          "\t\tfs  - /proc/device-tree style directory",
 82         "\n\tOutput file",
 83         "\n\tOutput formats are:\n"
 84          "\t\tdts - device tree source text\n"
 85          "\t\tdtb - device tree blob\n"
 86 #ifndef NO_YAML
 87          "\t\tyaml - device tree encoded as YAML\n"
 88 #endif
 89          "\t\tasm - assembler source",
 90         "\n\tBlob version to produce, defaults to "stringify(DEFAULT_FDT_VERSION)" (for dtb and asm output)",
 91         "\n\tOutput dependency file",
 92         "\n\tMake space for <number> reserve map entries (for dtb and asm output)",
 93         "\n\tMake the blob at least <bytes> long (extra space)",
 94         "\n\tAdd padding to the blob of <bytes> long (extra space)",
 95         "\n\tMake the blob align to the <bytes> (extra space)",
 96         "\n\tSet the physical boot cpu",
 97         "\n\tTry to produce output even if the input tree has errors",
 98         "\n\tAdd a path to search for include files",
 99         "\n\tSort nodes and properties before outputting (useful for comparing trees)",
100         "\n\tValid phandle formats are:\n"
101          "\t\tlegacy - \"linux,phandle\" properties only\n"
102          "\t\tepapr  - \"phandle\" properties only\n"
103          "\t\tboth   - Both \"linux,phandle\" and \"phandle\" properties",
104         "\n\tEnable/disable warnings (prefix with \"no-\")",
105         "\n\tEnable/disable errors (prefix with \"no-\")",
106         "\n\tEnable generation of symbols",
107         "\n\tEnable auto-alias of labels",
108         "\n\tAnnotate output .dts with input source file and line (-T -T for more details)",
109         "\n\tPrint this help and exit",
110         "\n\tPrint version and exit",
111         NULL,
112 };
113 
114 static const char *guess_type_by_name(const char *fname, const char *fallback)
115 {
116         const char *s;
117 
118         s = strrchr(fname, '.');
119         if (s == NULL)
120                 return fallback;
121         if (!strcasecmp(s, ".dts"))
122                 return "dts";
123         if (!strcasecmp(s, ".yaml"))
124                 return "yaml";
125         if (!strcasecmp(s, ".dtb"))
126                 return "dtb";
127         return fallback;
128 }
129 
130 static const char *guess_input_format(const char *fname, const char *fallback)
131 {
132         struct stat statbuf;
133         fdt32_t magic;
134         FILE *f;
135 
136         if (stat(fname, &statbuf) != 0)
137                 return fallback;
138 
139         if (S_ISDIR(statbuf.st_mode))
140                 return "fs";
141 
142         if (!S_ISREG(statbuf.st_mode))
143                 return fallback;
144 
145         f = fopen(fname, "r");
146         if (f == NULL)
147                 return fallback;
148         if (fread(&magic, 4, 1, f) != 1) {
149                 fclose(f);
150                 return fallback;
151         }
152         fclose(f);
153 
154         if (fdt32_to_cpu(magic) == FDT_MAGIC)
155                 return "dtb";
156 
157         return guess_type_by_name(fname, fallback);
158 }
159 
160 int main(int argc, char *argv[])
161 {
162         struct dt_info *dti;
163         const char *inform = NULL;
164         const char *outform = NULL;
165         const char *outname = "-";
166         const char *depname = NULL;
167         bool force = false, sort = false;
168         const char *arg;
169         int opt;
170         FILE *outf = NULL;
171         int outversion = DEFAULT_FDT_VERSION;
172         long long cmdline_boot_cpuid = -1;
173 
174         quiet      = 0;
175         reservenum = 0;
176         minsize    = 0;
177         padsize    = 0;
178         alignsize  = 0;
179 
180         while ((opt = util_getopt_long()) != EOF) {
181                 switch (opt) {
182                 case 'I':
183                         inform = optarg;
184                         break;
185                 case 'O':
186                         outform = optarg;
187                         break;
188                 case 'o':
189                         outname = optarg;
190                         break;
191                 case 'V':
192                         outversion = strtol(optarg, NULL, 0);
193                         break;
194                 case 'd':
195                         depname = optarg;
196                         break;
197                 case 'R':
198                         reservenum = strtol(optarg, NULL, 0);
199                         break;
200                 case 'S':
201                         minsize = strtol(optarg, NULL, 0);
202                         break;
203                 case 'p':
204                         padsize = strtol(optarg, NULL, 0);
205                         break;
206                 case 'a':
207                         alignsize = strtol(optarg, NULL, 0);
208                         if (!is_power_of_2(alignsize))
209                                 die("Invalid argument \"%d\" to -a option\n",
210                                     alignsize);
211                         break;
212                 case 'f':
213                         force = true;
214                         break;
215                 case 'q':
216                         quiet++;
217                         break;
218                 case 'b':
219                         cmdline_boot_cpuid = strtoll(optarg, NULL, 0);
220                         break;
221                 case 'i':
222                         srcfile_add_search_path(optarg);
223                         break;
224                 case 'v':
225                         util_version();
226                 case 'H':
227                         if (streq(optarg, "legacy"))
228                                 phandle_format = PHANDLE_LEGACY;
229                         else if (streq(optarg, "epapr"))
230                                 phandle_format = PHANDLE_EPAPR;
231                         else if (streq(optarg, "both"))
232                                 phandle_format = PHANDLE_BOTH;
233                         else
234                                 die("Invalid argument \"%s\" to -H option\n",
235                                     optarg);
236                         break;
237 
238                 case 's':
239                         sort = true;
240                         break;
241 
242                 case 'W':
243                         parse_checks_option(true, false, optarg);
244                         break;
245 
246                 case 'E':
247                         parse_checks_option(false, true, optarg);
248                         break;
249 
250                 case '@':
251                         generate_symbols = 1;
252                         break;
253                 case 'A':
254                         auto_label_aliases = 1;
255                         break;
256                 case 'T':
257                         annotate++;
258                         break;
259 
260                 case 'h':
261                         usage(NULL);
262                 default:
263                         usage("unknown option");
264                 }
265         }
266 
267         if (argc > (optind+1))
268                 usage("missing files");
269         else if (argc < (optind+1))
270                 arg = "-";
271         else
272                 arg = argv[optind];
273 
274         /* minsize and padsize are mutually exclusive */
275         if (minsize && padsize)
276                 die("Can't set both -p and -S\n");
277 
278         if (depname) {
279                 depfile = fopen(depname, "w");
280                 if (!depfile)
281                         die("Couldn't open dependency file %s: %s\n", depname,
282                             strerror(errno));
283                 fprintf(depfile, "%s:", outname);
284         }
285 
286         if (inform == NULL)
287                 inform = guess_input_format(arg, "dts");
288         if (outform == NULL) {
289                 outform = guess_type_by_name(outname, NULL);
290                 if (outform == NULL) {
291                         if (streq(inform, "dts"))
292                                 outform = "dtb";
293                         else
294                                 outform = "dts";
295                 }
296         }
297         if (annotate && (!streq(inform, "dts") || !streq(outform, "dts")))
298                 die("--annotate requires -I dts -O dts\n");
299         if (streq(inform, "dts"))
300                 dti = dt_from_source(arg);
301         else if (streq(inform, "fs"))
302                 dti = dt_from_fs(arg);
303         else if(streq(inform, "dtb"))
304                 dti = dt_from_blob(arg);
305         else
306                 die("Unknown input format \"%s\"\n", inform);
307 
308         dti->outname = outname;
309 
310         if (depfile) {
311                 fputc('\n', depfile);
312                 fclose(depfile);
313         }
314 
315         if (cmdline_boot_cpuid != -1)
316                 dti->boot_cpuid_phys = cmdline_boot_cpuid;
317 
318         fill_fullpaths(dti->dt, "");
319 
320         /* on a plugin, generate by default */
321         if (dti->dtsflags & DTSF_PLUGIN) {
322                 generate_fixups = 1;
323         }
324 
325         process_checks(force, dti);
326 
327         if (auto_label_aliases)
328                 generate_label_tree(dti, "aliases", false);
329 
330         if (generate_symbols)
331                 generate_label_tree(dti, "__symbols__", true);
332 
333         if (generate_fixups) {
334                 generate_fixups_tree(dti, "__fixups__");
335                 generate_local_fixups_tree(dti, "__local_fixups__");
336         }
337 
338         if (sort)
339                 sort_tree(dti);
340 
341         if (streq(outname, "-")) {
342                 outf = stdout;
343         } else {
344                 outf = fopen(outname, "wb");
345                 if (! outf)
346                         die("Couldn't open output file %s: %s\n",
347                             outname, strerror(errno));
348         }
349 
350         if (streq(outform, "dts")) {
351                 dt_to_source(outf, dti);
352 #ifndef NO_YAML
353         } else if (streq(outform, "yaml")) {
354                 if (!streq(inform, "dts"))
355                         die("YAML output format requires dts input format\n");
356                 dt_to_yaml(outf, dti);
357 #endif
358         } else if (streq(outform, "dtb")) {
359                 dt_to_blob(outf, dti, outversion);
360         } else if (streq(outform, "asm")) {
361                 dt_to_asm(outf, dti, outversion);
362         } else if (streq(outform, "null")) {
363                 /* do nothing */
364         } else {
365                 die("Unknown output format \"%s\"\n", outform);
366         }
367 
368         exit(0);
369 }
370 

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