sim/rx/trace.c

   1 /* trace.c --- tracing output for the RX simulator.
   2
   3 Copyright (C) 2005-2019 Free Software Foundation, Inc.
   4 Contributed by Red Hat, Inc.
   5
   6 This file is part of the GNU simulators.
   7
   8 This program is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 3 of the License, or
  11 (at your option) any later version.
  12
  13 This program is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21
  22 #include "config.h"
  23 #include <stdio.h>
  24 #include <stdarg.h>
  25 #include <string.h>
  26 #include <stdlib.h>
  27 #include <sys/types.h>
  28 #include <sys/stat.h>
  29 #include <ctype.h>
  30
  31 #include "bfd.h"
  32 #include "dis-asm.h"
  33
  34 #include "cpu.h"
  35 #include "mem.h"
  36 #include "load.h"
  37
  38 static int
  39 sim_dis_read (bfd_vma memaddr, bfd_byte * ptr, unsigned int length,
  40               struct disassemble_info *info)
  41 {
  42   int i;
  43
  44   if (rx_big_endian)
  45     {
  46       /* See load.c for an explanation of this.  */
  47       for (i=0; i<length; i++)
  48         ptr[i] = mem_get_qi ((memaddr + i) ^ 3);
  49     }
  50   else
  51     mem_get_blk (memaddr, ptr, length);
  52   return 0;
  53 }
  54
  55 /* Filter out (in place) symbols that are useless for disassembly.
  56    COUNT is the number of elements in SYMBOLS.
  57    Return the number of useful symbols. */
  58
  59 static long
  60 remove_useless_symbols (asymbol ** symbols, long count)
  61 {
  62   register asymbol **in_ptr = symbols, **out_ptr = symbols;
  63
  64   while (--count >= 0)
  65     {
  66       asymbol *sym = *in_ptr++;
  67
  68       if (strstr (sym->name, "gcc2_compiled"))
  69         continue;
  70       if (sym->name == NULL || sym->name[0] == '\0')
  71         continue;
  72       if (sym->flags & (BSF_DEBUGGING))
  73         continue;
  74       if (bfd_is_und_section (sym->section)
  75           || bfd_is_com_section (sym->section))
  76         continue;
  77
  78       *out_ptr++ = sym;
  79     }
  80   return out_ptr - symbols;
  81 }
  82
  83 static int
  84 compare_symbols (const PTR ap, const PTR bp)
  85 {
  86   const asymbol *a = *(const asymbol **) ap;
  87   const asymbol *b = *(const asymbol **) bp;
  88
  89   if (bfd_asymbol_value (a) > bfd_asymbol_value (b))
  90     return 1;
  91   else if (bfd_asymbol_value (a) < bfd_asymbol_value (b))
  92     return -1;
  93   return 0;
  94 }
  95
  96 static char opbuf[1000];
  97
  98 static int
  99 op_printf (char *buf, char *fmt, ...)
 100 {
 101   int ret;
 102   va_list ap;
 103
 104   va_start (ap, fmt);
 105   ret = vsprintf (opbuf + strlen (opbuf), fmt, ap);
 106   va_end (ap);
 107   return ret;
 108 }
 109
 110 static bfd *       current_bfd = NULL;
 111 static asymbol **  symtab = NULL;
 112 static int         symcount = 0;
 113 static asection *  code_section = NULL;
 114 static bfd_vma     code_base = 0;
 115 static struct disassemble_info info;
 116
 117 void
 118 sim_disasm_init (bfd *prog)
 119 {
 120   current_bfd = prog;
 121 }
 122
 123 typedef struct Files
 124 {
 125   struct Files *next;
 126   char *filename;
 127   int nlines;
 128   char **lines;
 129   char *data;
 130 } Files;
 131 Files *files = 0;
 132
 133 static char *
 134 load_file_and_line (const char *filename, int lineno)
 135 {
 136   Files *f;
 137   for (f = files; f; f = f->next)
 138     if (strcmp (f->filename, filename) == 0)
 139       break;
 140   if (!f)
 141     {
 142       int i;
 143       struct stat s;
 144       const char *found_filename, *slash;
 145
 146       found_filename = filename;
 147       while (1)
 148         {
 149           if (stat (found_filename, &s) == 0)
 150             break;
 151           slash = strchr (found_filename, '/');
 152           if (!slash)
 153             return "";
 154           found_filename = slash + 1;
 155         }
 156
 157       f = (Files *) malloc (sizeof (Files));
 158       f->next = files;
 159       files = f;
 160       f->filename = strdup (filename);
 161       f->data = (char *) malloc (s.st_size + 2);
 162       FILE *file = fopen (found_filename, "rb");
 163       fread (f->data, 1, s.st_size, file);
 164       f->data[s.st_size] = 0;
 165       fclose (file);
 166
 167       f->nlines = 1;
 168       for (i = 0; i < s.st_size; i++)
 169         if (f->data[i] == '\n')
 170           f->nlines++;
 171       f->lines = (char **) malloc (f->nlines * sizeof (char *));
 172       f->lines[0] = f->data;
 173       f->nlines = 1;
 174       for (i = 0; i < s.st_size; i++)
 175         if (f->data[i] == '\n')
 176           {
 177             f->lines[f->nlines] = f->data + i + 1;
 178             while (*f->lines[f->nlines] == ' '
 179                    || *f->lines[f->nlines] == '\t')
 180               f->lines[f->nlines]++;
 181             f->nlines++;
 182             f->data[i] = 0;
 183           }
 184     }
 185   if (lineno < 1 || lineno > f->nlines)
 186     return "";
 187   return f->lines[lineno - 1];
 188 }
 189
 190 int
 191 sim_get_current_source_location (const char **  pfilename,
 192                                  const char **  pfunctionname,
 193                                  unsigned int * plineno)
 194 {
 195   static int   initted = 0;
 196   int          mypc = get_reg (pc);
 197
 198   if (current_bfd == NULL)
 199     return 0;
 200
 201   if (!initted)
 202     {
 203       int storage;
 204       asection * s;
 205
 206       initted = 1;
 207       memset (& info, 0, sizeof (info));
 208       INIT_DISASSEMBLE_INFO (info, stdout, op_printf);
 209       info.read_memory_func = sim_dis_read;
 210       info.arch = bfd_get_arch (current_bfd);
 211       info.mach = bfd_get_mach (current_bfd);
 212       if (info.mach == 0)
 213         info.arch = bfd_arch_rx;
 214
 215       disassemble_init_for_target (& info);
 216
 217       storage = bfd_get_symtab_upper_bound (current_bfd);
 218       if (storage > 0)
 219         {
 220           symtab = (asymbol **) malloc (storage);
 221           symcount = bfd_canonicalize_symtab (current_bfd, symtab);
 222           symcount = remove_useless_symbols (symtab, symcount);
 223           qsort (symtab, symcount, sizeof (asymbol *), compare_symbols);
 224         }
 225
 226       for (s = current_bfd->sections; s; s = s->next)
 227         {
 228           if (s->flags & SEC_CODE || code_section == 0)
 229             {
 230               code_section = s;
 231               code_base = bfd_section_lma (current_bfd, s);
 232               break;
 233             }
 234         }
 235     }
 236
 237   *pfilename = *pfunctionname = NULL;
 238   *plineno = 0;
 239
 240   bfd_find_nearest_line
 241     (current_bfd, code_section, symtab, mypc - code_base,
 242      pfilename, pfunctionname, plineno);
 243
 244   return 1;
 245 }
 246
 247 void
 248 sim_disasm_one (void)
 249 {
 250   static int           last_sym = -1;
 251   static const char *  prev_filename = "";
 252   static int           prev_lineno = 0;
 253   const char *  filename;
 254   const char *  functionname;
 255   unsigned int  lineno;
 256   int           sym, bestaddr;
 257   int           min, max, i;
 258   int           save_trace = trace;
 259   int           mypc = get_reg (pc);
 260
 261   if (! sim_get_current_source_location (& filename, & functionname, & lineno))
 262     return;
 263
 264   trace = 0;
 265
 266   if (filename && functionname && lineno)
 267     {
 268       if (lineno != prev_lineno || strcmp (prev_filename, filename))
 269         {
 270           char *       the_line = load_file_and_line (filename, lineno);
 271           const char * slash = strrchr (filename, '/');
 272
 273           if (!slash)
 274             slash = filename;
 275           else
 276             slash++;
 277           printf
 278             ("========================================"
 279              "=====================================\n");
 280           printf ("\033[37;41m %s:%d: \033[33;40m %s\033[K\033[0m\n",
 281                   slash, lineno, the_line);
 282         }
 283       prev_lineno = lineno;
 284       prev_filename = filename;
 285     }
 286
 287   min = -1;
 288   max = symcount;
 289   while (min < max - 1)
 290     {
 291       bfd_vma sa;
 292
 293       sym = (min + max) / 2;
 294       sa = bfd_asymbol_value (symtab[sym]);
 295       /*printf("checking %4d %08x %s\n",
 296         sym, sa, bfd_asymbol_name (symtab[sym])); */
 297       if (sa > mypc)
 298         max = sym;
 299       else if (sa < mypc)
 300         min = sym;
 301       else
 302         {
 303           min = sym;
 304           break;
 305         }
 306     }
 307
 308   if (min != -1 && min != last_sym)
 309     {
 310       bestaddr = bfd_asymbol_value (symtab[min]);
 311       printf ("\033[43;30m%s", bfd_asymbol_name (symtab[min]));
 312       if (bestaddr != mypc)
 313         printf ("+%d", mypc - bestaddr);
 314       printf (":\t\t\t\033[0m\n");
 315       last_sym = min;
 316 #if 0
 317       if (trace == 1)
 318         if (strcmp (bfd_asymbol_name (symtab[min]), "abort") == 0
 319             || strcmp (bfd_asymbol_name (symtab[min]), "exit") == 0)
 320           trace = 0;
 321 #endif
 322     }
 323
 324   opbuf[0] = 0;
 325 #ifdef CYCLE_ACCURATE
 326   printf ("\033[33m %04u %06x: ", (int)(regs.cycle_count % 10000), mypc);
 327 #else
 328   printf ("\033[33m %06x: ", mypc);
 329
 330 #endif
 331
 332   max = print_insn_rx (mypc, & info);
 333
 334   for (i = 0; i < max; i++)
 335     {
 336       if (rx_big_endian)
 337         printf ("%02x", mem_get_qi ((mypc + i) ^ 3));
 338       else
 339         printf ("%02x", mem_get_qi (mypc + i));
 340     }
 341
 342   do
 343     {
 344       printf ("  ");
 345       i ++;
 346     }
 347   while (i < 6);
 348
 349   printf ("%-16s  ", opbuf);
 350
 351   printf ("\033[0m\n");
 352   trace = save_trace;
 353 }