sim/rl78/trace.c

   1 /* trace.c --- tracing output for the RL78 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
  23 #include "config.h"
  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 "libiberty.h"
  33 #include "bfd.h"
  34 #include "dis-asm.h"
  35
  36 #include "cpu.h"
  37 #include "mem.h"
  38 #include "load.h"
  39
  40 static disassembler_ftype rl78_disasm_fn = NULL;
  41
  42 static int
  43 sim_dis_read (bfd_vma memaddr, bfd_byte * ptr, unsigned int length,
  44               struct disassemble_info *info)
  45 {
  46   mem_get_blk (memaddr, ptr, length);
  47   return 0;
  48 }
  49
  50 /* Filter out (in place) symbols that are useless for disassembly.
  51    COUNT is the number of elements in SYMBOLS.
  52    Return the number of useful symbols. */
  53
  54 static long
  55 remove_useless_symbols (asymbol ** symbols, long count)
  56 {
  57   register asymbol **in_ptr = symbols, **out_ptr = symbols;
  58
  59   while (-- count >= 0)
  60     {
  61       asymbol *sym = *in_ptr ++;
  62
  63       if (strstr (sym->name, "gcc2_compiled"))
  64         continue;
  65       if (sym->name == NULL || sym->name[0] == '\0')
  66         continue;
  67       if (sym->flags & (BSF_DEBUGGING))
  68         continue;
  69       if (bfd_is_und_section (sym->section)
  70           || bfd_is_com_section (sym->section))
  71         continue;
  72
  73       *out_ptr++ = sym;
  74     }
  75   return out_ptr - symbols;
  76 }
  77
  78 static int
  79 compare_symbols (const PTR ap, const PTR bp)
  80 {
  81   const asymbol *a = *(const asymbol **) ap;
  82   const asymbol *b = *(const asymbol **) bp;
  83
  84   if (bfd_asymbol_value (a) > bfd_asymbol_value (b))
  85     return 1;
  86   else if (bfd_asymbol_value (a) < bfd_asymbol_value (b))
  87     return -1;
  88   return 0;
  89 }
  90
  91 static char opbuf[1000];
  92
  93 static int
  94 op_printf (char *buf, char *fmt, ...)
  95 {
  96   int ret;
  97   va_list ap;
  98
  99   va_start (ap, fmt);
 100   ret = vsprintf (opbuf + strlen (opbuf), fmt, ap);
 101   va_end (ap);
 102   return ret;
 103 }
 104
 105 static bfd *       current_bfd = NULL;
 106 static asymbol **  symtab = NULL;
 107 static int         symcount = 0;
 108 static asection *  code_section = NULL;
 109 static bfd_vma     code_base = 0;
 110 static struct disassemble_info info;
 111
 112 void
 113 sim_disasm_init (bfd *prog)
 114 {
 115   current_bfd = prog;
 116   rl78_disasm_fn = NULL;
 117 }
 118
 119 typedef struct Files
 120 {
 121   struct Files *next;
 122   char *filename;
 123   int nlines;
 124   char **lines;
 125   char *data;
 126 } Files;
 127 Files *files = 0;
 128
 129 static char *
 130 load_file_and_line (const char *filename, int lineno)
 131 {
 132   Files *f;
 133   for (f = files; f; f = f->next)
 134     if (strcmp (f->filename, filename) == 0)
 135       break;
 136   if (!f)
 137     {
 138       int i;
 139       struct stat s;
 140       const char *found_filename, *slash;
 141
 142       found_filename = filename;
 143       while (1)
 144         {
 145           if (stat (found_filename, &s) == 0)
 146             break;
 147           slash = strchr (found_filename, '/');
 148           if (!slash)
 149             return "";
 150           found_filename = slash + 1;
 151         }
 152
 153       f = (Files *) xmalloc (sizeof (Files));
 154       f->next = files;
 155       files = f;
 156       f->filename = xstrdup (filename);
 157       f->data = (char *) xmalloc (s.st_size + 2);
 158       FILE *file = fopen (found_filename, "rb");
 159       fread (f->data, 1, s.st_size, file);
 160       f->data[s.st_size] = 0;
 161       fclose (file);
 162
 163       f->nlines = 1;
 164       for (i = 0; i < s.st_size; i ++)
 165         if (f->data[i] == '\n')
 166           f->nlines ++;
 167       f->lines = (char **) xmalloc (f->nlines * sizeof (char *));
 168       f->lines[0] = f->data;
 169       f->nlines = 1;
 170       for (i = 0; i < s.st_size; i ++)
 171         if (f->data[i] == '\n')
 172           {
 173             f->lines[f->nlines] = f->data + i + 1;
 174             while (*f->lines[f->nlines] == ' '
 175                    || *f->lines[f->nlines] == '\t')
 176               f->lines[f->nlines] ++;
 177             f->nlines ++;
 178             f->data[i] = 0;
 179           }
 180     }
 181   if (lineno < 1 || lineno > f->nlines)
 182     return "";
 183   return f->lines[lineno - 1];
 184 }
 185
 186 int
 187 sim_get_current_source_location (const char **  pfilename,
 188                                  const char **  pfunctionname,
 189                                  unsigned int * plineno)
 190 {
 191   static int   initted = 0;
 192   int          mypc = pc;
 193
 194   if (current_bfd == NULL)
 195     return 0;
 196
 197   if (!initted)
 198     {
 199       int storage;
 200       asection * s;
 201
 202       initted = 1;
 203       memset (& info, 0, sizeof (info));
 204       INIT_DISASSEMBLE_INFO (info, stdout, op_printf);
 205       info.read_memory_func = sim_dis_read;
 206       info.arch = bfd_get_arch (current_bfd);
 207       info.mach = bfd_get_mach (current_bfd);
 208       if (info.mach == 0)
 209         info.arch = bfd_arch_rl78;
 210
 211       disassemble_init_for_target (& info);
 212
 213       storage = bfd_get_symtab_upper_bound (current_bfd);
 214       if (storage > 0)
 215         {
 216           symtab = (asymbol **) xmalloc (storage);
 217           symcount = bfd_canonicalize_symtab (current_bfd, symtab);
 218           symcount = remove_useless_symbols (symtab, symcount);
 219           qsort (symtab, symcount, sizeof (asymbol *), compare_symbols);
 220         }
 221
 222       for (s = current_bfd->sections; s; s = s->next)
 223         {
 224           if (s->flags & SEC_CODE || code_section == 0)
 225             {
 226               code_section = s;
 227               code_base = bfd_section_lma (s);
 228               break;
 229             }
 230         }
 231     }
 232
 233   *pfilename = *pfunctionname = NULL;
 234   *plineno = 0;
 235
 236   bfd_find_nearest_line
 237     (current_bfd, code_section, symtab, mypc - code_base,
 238      pfilename, pfunctionname, plineno);
 239
 240   return 1;
 241 }
 242
 243 void
 244 sim_disasm_one (void)
 245 {
 246   static int           last_sym = -1;
 247   static const char *  prev_filename = "";
 248   static int           prev_lineno = 0;
 249   const char *  filename;
 250   const char *  functionname;
 251   unsigned int  lineno;
 252   int           sym, bestaddr;
 253   int           min, max, i;
 254   int           save_trace = trace;
 255   int           mypc = pc;
 256
 257   if (! sim_get_current_source_location (& filename, & functionname, & lineno))
 258     return;
 259
 260   trace = 0;
 261
 262   if (!rl78_disasm_fn)
 263     {
 264       if (rl78_g10_mode)
 265         rl78_disasm_fn = print_insn_rl78_g10;
 266       else if (g14_multiply)
 267         rl78_disasm_fn = print_insn_rl78_g14;
 268       else if (g13_multiply)
 269         rl78_disasm_fn = print_insn_rl78_g13;
 270       else
 271         rl78_disasm_fn = print_insn_rl78;
 272     }
 273
 274   if (filename && functionname && lineno)
 275     {
 276       if (lineno != prev_lineno || strcmp (prev_filename, filename))
 277         {
 278           char *       the_line = load_file_and_line (filename, lineno);
 279           const char * slash = strrchr (filename, '/');
 280
 281           if (!slash)
 282             slash = filename;
 283           else
 284             slash ++;
 285           printf
 286             ("========================================"
 287              "=====================================\n");
 288           printf ("\033[37;41m %s:%d: \033[33;40m %s\033[K\033[0m\n",
 289                   slash, lineno, the_line);
 290         }
 291       prev_lineno = lineno;
 292       prev_filename = filename;
 293     }
 294
 295   min = -1;
 296   max = symcount;
 297   while (min < max - 1)
 298     {
 299       bfd_vma sa;
 300
 301       sym = (min + max) / 2;
 302       sa = bfd_asymbol_value (symtab[sym]);
 303       /*printf ("checking %4d %08x %s\n",
 304         sym, sa, bfd_asymbol_name (symtab[sym])); */
 305       if (sa > mypc)
 306         max = sym;
 307       else if (sa < mypc)
 308         min = sym;
 309       else
 310         {
 311           min = sym;
 312           break;
 313         }
 314     }
 315
 316   if (min != -1 && min != last_sym)
 317     {
 318       bestaddr = bfd_asymbol_value (symtab[min]);
 319       printf ("\033[43;30m%s", bfd_asymbol_name (symtab[min]));
 320       if (bestaddr != mypc)
 321         printf ("+%d", mypc - bestaddr);
 322       printf (":\t\t\t\033[0m\n");
 323       last_sym = min;
 324 #if 0
 325       if (trace == 1)
 326         if (strcmp (bfd_asymbol_name (symtab[min]), "abort") == 0
 327             || strcmp (bfd_asymbol_name (symtab[min]), "exit") == 0)
 328           trace = 0;
 329 #endif
 330     }
 331
 332 #define TCR0    0xf0180
 333
 334   opbuf[0] = 0;
 335 #ifdef CYCLE_ACCURATE
 336   printf ("\033[33m %04u %06x: ", (int)(regs.cycle_count % 10000), mypc);
 337 #else
 338   printf ("\033[33m %08llx %06x: ", total_clocks, mypc);
 339 #endif
 340
 341   max = rl78_disasm_fn (mypc, & info);
 342
 343   for (i = 0; i < max; i ++)
 344     printf ("%02x", mem_get_qi (mypc + i));
 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 }