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 /* This must come before any other includes.  */
  22 #include "defs.h"
  23
  24 #include <stdio.h>
  25 #include <stdarg.h>
  26 #include <string.h>
  27 #include <stdlib.h>
  28 #include <sys/types.h>
  29 #include <sys/stat.h>
  30 #include <ctype.h>
  31
  32 #include "bfd.h"
  33 #include "dis-asm.h"
  34
  35 #include "cpu.h"
  36 #include "mem.h"
  37 #include "load.h"
  38 #include "trace.h"
  39
  40 static int
  41 sim_dis_read (bfd_vma memaddr, bfd_byte * ptr, unsigned int length,
  42               struct disassemble_info *info)
  43 {
  44   int i;
  45
  46   if (rx_big_endian)
  47     {
  48       /* See load.c for an explanation of this.  */
  49       for (i=0; i<length; i++)
  50         ptr[i] = mem_get_qi ((memaddr + i) ^ 3);
  51     }
  52   else
  53     mem_get_blk (memaddr, ptr, length);
  54   return 0;
  55 }
  56
  57 /* Filter out (in place) symbols that are useless for disassembly.
  58    COUNT is the number of elements in SYMBOLS.
  59    Return the number of useful symbols. */
  60
  61 static long
  62 remove_useless_symbols (asymbol ** symbols, long count)
  63 {
  64   register asymbol **in_ptr = symbols, **out_ptr = symbols;
  65
  66   while (--count >= 0)
  67     {
  68       asymbol *sym = *in_ptr++;
  69
  70       if (strstr (sym->name, "gcc2_compiled"))
  71         continue;
  72       if (sym->name == NULL || sym->name[0] == '\0')
  73         continue;
  74       if (sym->flags & (BSF_DEBUGGING))
  75         continue;
  76       if (bfd_is_und_section (sym->section)
  77           || bfd_is_com_section (sym->section))
  78         continue;
  79
  80       *out_ptr++ = sym;
  81     }
  82   return out_ptr - symbols;
  83 }
  84
  85 static int
  86 compare_symbols (const PTR ap, const PTR bp)
  87 {
  88   const asymbol *a = *(const asymbol **) ap;
  89   const asymbol *b = *(const asymbol **) bp;
  90
  91   if (bfd_asymbol_value (a) > bfd_asymbol_value (b))
  92     return 1;
  93   else if (bfd_asymbol_value (a) < bfd_asymbol_value (b))
  94     return -1;
  95   return 0;
  96 }
  97
  98 static char opbuf[1000];
  99
 100 static int ATTRIBUTE_PRINTF (2, 3)
 101 op_printf (char *buf, char *fmt, ...)
 102 {
 103   int ret;
 104   va_list ap;
 105
 106   va_start (ap, fmt);
 107   ret = vsprintf (opbuf + strlen (opbuf), fmt, ap);
 108   va_end (ap);
 109   return ret;
 110 }
 111
 112 static bfd *       current_bfd = NULL;
 113 static asymbol **  symtab = NULL;
 114 static int         symcount = 0;
 115 static asection *  code_section = NULL;
 116 static bfd_vma     code_base = 0;
 117 static struct disassemble_info info;
 118
 119 void
 120 sim_disasm_init (bfd *prog)
 121 {
 122   current_bfd = prog;
 123 }
 124
 125 typedef struct Files
 126 {
 127   struct Files *next;
 128   char *filename;
 129   int nlines;
 130   char **lines;
 131   char *data;
 132 } Files;
 133 Files *files = 0;
 134
 135 static char *
 136 load_file_and_line (const char *filename, int lineno)
 137 {
 138   Files *f;
 139   for (f = files; f; f = f->next)
 140     if (strcmp (f->filename, filename) == 0)
 141       break;
 142   if (!f)
 143     {
 144       FILE *file;
 145       int i;
 146       struct stat s;
 147       size_t ret;
 148       const char *found_filename, *slash;
 149
 150       found_filename = filename;
 151       while (1)
 152         {
 153           if (stat (found_filename, &s) == 0)
 154             break;
 155           slash = strchr (found_filename, '/');
 156           if (!slash)
 157             return "";
 158           found_filename = slash + 1;
 159         }
 160
 161       f = (Files *) malloc (sizeof (Files));
 162       f->next = files;
 163       files = f;
 164       f->filename = strdup (filename);
 165       f->data = (char *) malloc (s.st_size + 2);
 166       file = fopen (found_filename, "rb");
 167       ret = fread (f->data, 1, s.st_size, file);
 168       f->data[ret] = 0;
 169       fclose (file);
 170
 171       f->nlines = 1;
 172       for (i = 0; i < s.st_size; i++)
 173         if (f->data[i] == '\n')
 174           f->nlines++;
 175       f->lines = (char **) malloc (f->nlines * sizeof (char *));
 176       f->lines[0] = f->data;
 177       f->nlines = 1;
 178       for (i = 0; i < s.st_size; i++)
 179         if (f->data[i] == '\n')
 180           {
 181             f->lines[f->nlines] = f->data + i + 1;
 182             while (*f->lines[f->nlines] == ' '
 183                    || *f->lines[f->nlines] == '\t')
 184               f->lines[f->nlines]++;
 185             f->nlines++;
 186             f->data[i] = 0;
 187           }
 188     }
 189   if (lineno < 1 || lineno > f->nlines)
 190     return "";
 191   return f->lines[lineno - 1];
 192 }
 193
 194 int
 195 sim_get_current_source_location (const char **  pfilename,
 196                                  const char **  pfunctionname,
 197                                  unsigned int * plineno)
 198 {
 199   static int   initted = 0;
 200   int          mypc = get_reg (pc);
 201
 202   if (current_bfd == NULL)
 203     return 0;
 204
 205   if (!initted)
 206     {
 207       int storage;
 208       asection * s;
 209
 210       initted = 1;
 211       memset (& info, 0, sizeof (info));
 212       INIT_DISASSEMBLE_INFO (info, stdout, op_printf);
 213       info.read_memory_func = sim_dis_read;
 214       info.arch = bfd_get_arch (current_bfd);
 215       info.mach = bfd_get_mach (current_bfd);
 216       if (info.mach == 0)
 217         info.arch = bfd_arch_rx;
 218
 219       disassemble_init_for_target (& info);
 220
 221       storage = bfd_get_symtab_upper_bound (current_bfd);
 222       if (storage > 0)
 223         {
 224           symtab = (asymbol **) malloc (storage);
 225           symcount = bfd_canonicalize_symtab (current_bfd, symtab);
 226           symcount = remove_useless_symbols (symtab, symcount);
 227           qsort (symtab, symcount, sizeof (asymbol *), compare_symbols);
 228         }
 229
 230       for (s = current_bfd->sections; s; s = s->next)
 231         {
 232           if (s->flags & SEC_CODE || code_section == 0)
 233             {
 234               code_section = s;
 235               code_base = bfd_section_lma (s);
 236               break;
 237             }
 238         }
 239     }
 240
 241   *pfilename = *pfunctionname = NULL;
 242   *plineno = 0;
 243
 244   bfd_find_nearest_line
 245     (current_bfd, code_section, symtab, mypc - code_base,
 246      pfilename, pfunctionname, plineno);
 247
 248   return 1;
 249 }
 250
 251 void
 252 sim_disasm_one (void)
 253 {
 254   static int           last_sym = -1;
 255   static const char *  prev_filename = "";
 256   static int           prev_lineno = 0;
 257   const char *  filename;
 258   const char *  functionname;
 259   unsigned int  lineno;
 260   int           sym, bestaddr;
 261   int           min, max, i;
 262   int           save_trace = trace;
 263   int           mypc = get_reg (pc);
 264
 265   if (! sim_get_current_source_location (& filename, & functionname, & lineno))
 266     return;
 267
 268   trace = 0;
 269
 270   if (filename && functionname && lineno)
 271     {
 272       if (lineno != prev_lineno || strcmp (prev_filename, filename))
 273         {
 274           char *       the_line = load_file_and_line (filename, lineno);
 275           const char * slash = strrchr (filename, '/');
 276
 277           if (!slash)
 278             slash = filename;
 279           else
 280             slash++;
 281           printf
 282             ("========================================"
 283              "=====================================\n");
 284           printf ("\033[37;41m %s:%d: \033[33;40m %s\033[K\033[0m\n",
 285                   slash, lineno, the_line);
 286         }
 287       prev_lineno = lineno;
 288       prev_filename = filename;
 289     }
 290
 291   min = -1;
 292   max = symcount;
 293   while (min < max - 1)
 294     {
 295       bfd_vma sa;
 296
 297       sym = (min + max) / 2;
 298       sa = bfd_asymbol_value (symtab[sym]);
 299       /*printf("checking %4d %08x %s\n",
 300         sym, sa, bfd_asymbol_name (symtab[sym])); */
 301       if (sa > mypc)
 302         max = sym;
 303       else if (sa < mypc)
 304         min = sym;
 305       else
 306         {
 307           min = sym;
 308           break;
 309         }
 310     }
 311
 312   if (min != -1 && min != last_sym)
 313     {
 314       bestaddr = bfd_asymbol_value (symtab[min]);
 315       printf ("\033[43;30m%s", bfd_asymbol_name (symtab[min]));
 316       if (bestaddr != mypc)
 317         printf ("+%d", mypc - bestaddr);
 318       printf (":\t\t\t\033[0m\n");
 319       last_sym = min;
 320 #if 0
 321       if (trace == 1)
 322         if (strcmp (bfd_asymbol_name (symtab[min]), "abort") == 0
 323             || strcmp (bfd_asymbol_name (symtab[min]), "exit") == 0)
 324           trace = 0;
 325 #endif
 326     }
 327
 328   opbuf[0] = 0;
 329 #ifdef CYCLE_ACCURATE
 330   printf ("\033[33m %04u %06x: ", (int)(regs.cycle_count % 10000), mypc);
 331 #else
 332   printf ("\033[33m %06x: ", mypc);
 333
 334 #endif
 335
 336   max = print_insn_rx (mypc, & info);
 337
 338   for (i = 0; i < max; i++)
 339     {
 340       if (rx_big_endian)
 341         printf ("%02x", mem_get_qi ((mypc + i) ^ 3));
 342       else
 343         printf ("%02x", mem_get_qi (mypc + i));
 344     }
 345
 346   do
 347     {
 348       printf ("  ");
 349       i ++;
 350     }
 351   while (i < 6);
 352
 353   printf ("%-16s  ", opbuf);
 354
 355   printf ("\033[0m\n");
 356   trace = save_trace;
 357 }