sim/rx/trace.c

   1 /* trace.c --- tracing output for the RX simulator.
   2
   3 Copyright (C) 2005-2021 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 #include "trace.h"
  38
  39 static int
  40 sim_dis_read (bfd_vma memaddr, bfd_byte * ptr, unsigned int length,
  41               struct disassemble_info *info)
  42 {
  43   int i;
  44
  45   if (rx_big_endian)
  46     {
  47       /* See load.c for an explanation of this.  */
  48       for (i=0; i<length; i++)
  49         ptr[i] = mem_get_qi ((memaddr + i) ^ 3);
  50     }
  51   else
  52     mem_get_blk (memaddr, ptr, length);
  53   return 0;
  54 }
  55
  56 /* Filter out (in place) symbols that are useless for disassembly.
  57    COUNT is the number of elements in SYMBOLS.
  58    Return the number of useful symbols. */
  59
  60 static long
  61 remove_useless_symbols (asymbol ** symbols, long count)
  62 {
  63   register asymbol **in_ptr = symbols, **out_ptr = symbols;
  64
  65   while (--count >= 0)
  66     {
  67       asymbol *sym = *in_ptr++;
  68
  69       if (strstr (sym->name, "gcc2_compiled"))
  70         continue;
  71       if (sym->name == NULL || sym->name[0] == '\0')
  72         continue;
  73       if (sym->flags & (BSF_DEBUGGING))
  74         continue;
  75       if (bfd_is_und_section (sym->section)
  76           || bfd_is_com_section (sym->section))
  77         continue;
  78
  79       *out_ptr++ = sym;
  80     }
  81   return out_ptr - symbols;
  82 }
  83
  84 static int
  85 compare_symbols (const PTR ap, const PTR bp)
  86 {
  87   const asymbol *a = *(const asymbol **) ap;
  88   const asymbol *b = *(const asymbol **) bp;
  89
  90   if (bfd_asymbol_value (a) > bfd_asymbol_value (b))
  91     return 1;
  92   else if (bfd_asymbol_value (a) < bfd_asymbol_value (b))
  93     return -1;
  94   return 0;
  95 }
  96
  97 static char opbuf[1000];
  98
  99 static int
 100 op_printf (char *buf, char *fmt, ...)
 101 {
 102   int ret;
 103   va_list ap;
 104
 105   va_start (ap, fmt);
 106   ret = vsprintf (opbuf + strlen (opbuf), fmt, ap);
 107   va_end (ap);
 108   return ret;
 109 }
 110
 111 static bfd *       current_bfd = NULL;
 112 static asymbol **  symtab = NULL;
 113 static int         symcount = 0;
 114 static asection *  code_section = NULL;
 115 static bfd_vma     code_base = 0;
 116 static struct disassemble_info info;
 117
 118 void
 119 sim_disasm_init (bfd *prog)
 120 {
 121   current_bfd = prog;
 122 }
 123
 124 typedef struct Files
 125 {
 126   struct Files *next;
 127   char *filename;
 128   int nlines;
 129   char **lines;
 130   char *data;
 131 } Files;
 132 Files *files = 0;
 133
 134 static char *
 135 load_file_and_line (const char *filename, int lineno)
 136 {
 137   Files *f;
 138   for (f = files; f; f = f->next)
 139     if (strcmp (f->filename, filename) == 0)
 140       break;
 141   if (!f)
 142     {
 143       FILE *file;
 144       int i;
 145       struct stat s;
 146       const char *found_filename, *slash;
 147
 148       found_filename = filename;
 149       while (1)
 150         {
 151           if (stat (found_filename, &s) == 0)
 152             break;
 153           slash = strchr (found_filename, '/');
 154           if (!slash)
 155             return "";
 156           found_filename = slash + 1;
 157         }
 158
 159       f = (Files *) malloc (sizeof (Files));
 160       f->next = files;
 161       files = f;
 162       f->filename = strdup (filename);
 163       f->data = (char *) malloc (s.st_size + 2);
 164       file = fopen (found_filename, "rb");
 165       fread (f->data, 1, s.st_size, file);
 166       f->data[s.st_size] = 0;
 167       fclose (file);
 168
 169       f->nlines = 1;
 170       for (i = 0; i < s.st_size; i++)
 171         if (f->data[i] == '\n')
 172           f->nlines++;
 173       f->lines = (char **) malloc (f->nlines * sizeof (char *));
 174       f->lines[0] = f->data;
 175       f->nlines = 1;
 176       for (i = 0; i < s.st_size; i++)
 177         if (f->data[i] == '\n')
 178           {
 179             f->lines[f->nlines] = f->data + i + 1;
 180             while (*f->lines[f->nlines] == ' '
 181                    || *f->lines[f->nlines] == '\t')
 182               f->lines[f->nlines]++;
 183             f->nlines++;
 184             f->data[i] = 0;
 185           }
 186     }
 187   if (lineno < 1 || lineno > f->nlines)
 188     return "";
 189   return f->lines[lineno - 1];
 190 }
 191
 192 int
 193 sim_get_current_source_location (const char **  pfilename,
 194                                  const char **  pfunctionname,
 195                                  unsigned int * plineno)
 196 {
 197   static int   initted = 0;
 198   int          mypc = get_reg (pc);
 199
 200   if (current_bfd == NULL)
 201     return 0;
 202
 203   if (!initted)
 204     {
 205       int storage;
 206       asection * s;
 207
 208       initted = 1;
 209       memset (& info, 0, sizeof (info));
 210       INIT_DISASSEMBLE_INFO (info, stdout, op_printf);
 211       info.read_memory_func = sim_dis_read;
 212       info.arch = bfd_get_arch (current_bfd);
 213       info.mach = bfd_get_mach (current_bfd);
 214       if (info.mach == 0)
 215         info.arch = bfd_arch_rx;
 216
 217       disassemble_init_for_target (& info);
 218
 219       storage = bfd_get_symtab_upper_bound (current_bfd);
 220       if (storage > 0)
 221         {
 222           symtab = (asymbol **) malloc (storage);
 223           symcount = bfd_canonicalize_symtab (current_bfd, symtab);
 224           symcount = remove_useless_symbols (symtab, symcount);
 225           qsort (symtab, symcount, sizeof (asymbol *), compare_symbols);
 226         }
 227
 228       for (s = current_bfd->sections; s; s = s->next)
 229         {
 230           if (s->flags & SEC_CODE || code_section == 0)
 231             {
 232               code_section = s;
 233               code_base = bfd_section_lma (s);
 234               break;
 235             }
 236         }
 237     }
 238
 239   *pfilename = *pfunctionname = NULL;
 240   *plineno = 0;
 241
 242   bfd_find_nearest_line
 243     (current_bfd, code_section, symtab, mypc - code_base,
 244      pfilename, pfunctionname, plineno);
 245
 246   return 1;
 247 }
 248
 249 void
 250 sim_disasm_one (void)
 251 {
 252   static int           last_sym = -1;
 253   static const char *  prev_filename = "";
 254   static int           prev_lineno = 0;
 255   const char *  filename;
 256   const char *  functionname;
 257   unsigned int  lineno;
 258   int           sym, bestaddr;
 259   int           min, max, i;
 260   int           save_trace = trace;
 261   int           mypc = get_reg (pc);
 262
 263   if (! sim_get_current_source_location (& filename, & functionname, & lineno))
 264     return;
 265
 266   trace = 0;
 267
 268   if (filename && functionname && lineno)
 269     {
 270       if (lineno != prev_lineno || strcmp (prev_filename, filename))
 271         {
 272           char *       the_line = load_file_and_line (filename, lineno);
 273           const char * slash = strrchr (filename, '/');
 274
 275           if (!slash)
 276             slash = filename;
 277           else
 278             slash++;
 279           printf
 280             ("========================================"
 281              "=====================================\n");
 282           printf ("\033[37;41m %s:%d: \033[33;40m %s\033[K\033[0m\n",
 283                   slash, lineno, the_line);
 284         }
 285       prev_lineno = lineno;
 286       prev_filename = filename;
 287     }
 288
 289   min = -1;
 290   max = symcount;
 291   while (min < max - 1)
 292     {
 293       bfd_vma sa;
 294
 295       sym = (min + max) / 2;
 296       sa = bfd_asymbol_value (symtab[sym]);
 297       /*printf("checking %4d %08x %s\n",
 298         sym, sa, bfd_asymbol_name (symtab[sym])); */
 299       if (sa > mypc)
 300         max = sym;
 301       else if (sa < mypc)
 302         min = sym;
 303       else
 304         {
 305           min = sym;
 306           break;
 307         }
 308     }
 309
 310   if (min != -1 && min != last_sym)
 311     {
 312       bestaddr = bfd_asymbol_value (symtab[min]);
 313       printf ("\033[43;30m%s", bfd_asymbol_name (symtab[min]));
 314       if (bestaddr != mypc)
 315         printf ("+%d", mypc - bestaddr);
 316       printf (":\t\t\t\033[0m\n");
 317       last_sym = min;
 318 #if 0
 319       if (trace == 1)
 320         if (strcmp (bfd_asymbol_name (symtab[min]), "abort") == 0
 321             || strcmp (bfd_asymbol_name (symtab[min]), "exit") == 0)
 322           trace = 0;
 323 #endif
 324     }
 325
 326   opbuf[0] = 0;
 327 #ifdef CYCLE_ACCURATE
 328   printf ("\033[33m %04u %06x: ", (int)(regs.cycle_count % 10000), mypc);
 329 #else
 330   printf ("\033[33m %06x: ", mypc);
 331
 332 #endif
 333
 334   max = print_insn_rx (mypc, & info);
 335
 336   for (i = 0; i < max; i++)
 337     {
 338       if (rx_big_endian)
 339         printf ("%02x", mem_get_qi ((mypc + i) ^ 3));
 340       else
 341         printf ("%02x", mem_get_qi (mypc + i));
 342     }
 343
 344   do
 345     {
 346       printf ("  ");
 347       i ++;
 348     }
 349   while (i < 6);
 350
 351   printf ("%-16s  ", opbuf);
 352
 353   printf ("\033[0m\n");
 354   trace = save_trace;
 355 }