sim/m32c/trace.c

   1 /* trace.c --- tracing output for the M32C simulator.
   2
   3 Copyright (C) 2005-2024 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 #include "opcodes/m32c-desc.h"
  35
  36 #include "cpu.h"
  37 #include "mem.h"
  38 #include "load.h"
  39 #include "trace.h"
  40
  41 static int
  42 sim_dis_read (bfd_vma memaddr, bfd_byte * ptr, unsigned int length,
  43               struct disassemble_info *info)
  44 {
  45   mem_get_blk (memaddr, ptr, length);
  46   return 0;
  47 }
  48
  49 /* Filter out (in place) symbols that are useless for disassembly.
  50    COUNT is the number of elements in SYMBOLS.
  51    Return the number of useful symbols. */
  52
  53 static long
  54 remove_useless_symbols (asymbol ** symbols, long count)
  55 {
  56   register asymbol **in_ptr = symbols, **out_ptr = symbols;
  57
  58   while (--count >= 0)
  59     {
  60       asymbol *sym = *in_ptr++;
  61
  62       if (strstr (sym->name, "gcc2_compiled"))
  63         continue;
  64       if (sym->name == NULL || sym->name[0] == '\0')
  65         continue;
  66       if (sym->flags & (BSF_DEBUGGING))
  67         continue;
  68       if (bfd_is_und_section (sym->section)
  69           || bfd_is_com_section (sym->section))
  70         continue;
  71
  72       *out_ptr++ = sym;
  73     }
  74   return out_ptr - symbols;
  75 }
  76
  77 static int
  78 compare_symbols (const void *ap, const void *bp)
  79 {
  80   const asymbol *a = *(const asymbol **) ap;
  81   const asymbol *b = *(const asymbol **) bp;
  82
  83   if (bfd_asymbol_value (a) > bfd_asymbol_value (b))
  84     return 1;
  85   else if (bfd_asymbol_value (a) < bfd_asymbol_value (b))
  86     return -1;
  87   return 0;
  88 }
  89
  90 static char opbuf[1000];
  91
  92 static int ATTRIBUTE_PRINTF (2, 3)
  93 op_printf (char *buf, char *fmt, ...)
  94 {
  95   int ret;
  96   va_list ap;
  97
  98   va_start (ap, fmt);
  99   ret = vsprintf (opbuf + strlen (opbuf), fmt, ap);
 100   va_end (ap);
 101   return ret;
 102 }
 103
 104 static int ATTRIBUTE_PRINTF (3, 4)
 105 op_styled_printf (char *buf, enum disassembler_style style, char *fmt, ...)
 106 {
 107   int ret;
 108   va_list ap;
 109
 110   va_start (ap, fmt);
 111   ret = vsprintf (opbuf + strlen (opbuf), fmt, ap);
 112   va_end (ap);
 113   return ret;
 114 }
 115
 116 static bfd *current_bfd;
 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       int i;
 144       struct stat s;
 145       const char *found_filename, *slash;
 146       FILE *file;
 147       size_t ret;
 148
 149       found_filename = filename;
 150       while (1)
 151         {
 152           if (stat (found_filename, &s) == 0)
 153             break;
 154           slash = strchr (found_filename, '/');
 155           if (!slash)
 156             return "";
 157           found_filename = slash + 1;
 158         }
 159
 160       f = (Files *) malloc (sizeof (Files));
 161       f->next = files;
 162       files = f;
 163       f->filename = strdup (filename);
 164       f->data = (char *) malloc (s.st_size + 2);
 165       file = fopen (found_filename, "rb");
 166       ret = fread (f->data, 1, s.st_size, file);
 167       f->data[ret] = 0;
 168       fclose (file);
 169
 170       f->nlines = 1;
 171       for (i = 0; i < s.st_size; i++)
 172         if (f->data[i] == '\n')
 173           f->nlines++;
 174       f->lines = (char **) malloc (f->nlines * sizeof (char *));
 175       f->lines[0] = f->data;
 176       f->nlines = 1;
 177       for (i = 0; i < s.st_size; i++)
 178         if (f->data[i] == '\n')
 179           {
 180             f->lines[f->nlines] = f->data + i + 1;
 181             while (*f->lines[f->nlines] == ' '
 182                    || *f->lines[f->nlines] == '\t')
 183               f->lines[f->nlines]++;
 184             f->nlines++;
 185             f->data[i] = 0;
 186           }
 187     }
 188   if (lineno < 1 || lineno > f->nlines)
 189     return "";
 190   return f->lines[lineno - 1];
 191 }
 192
 193 void
 194 sim_disasm_one (void)
 195 {
 196   static int initted = 0;
 197   static asymbol **symtab = 0;
 198   static int symcount = 0;
 199   static int last_sym = -1;
 200   static struct disassemble_info info;
 201   int storage, sym, bestaddr;
 202   int min, max, i;
 203   static asection *code_section = 0;
 204   static bfd_vma code_base = 0;
 205   asection *s;
 206   int save_trace = trace;
 207
 208   static const char *prev_filename = "";
 209   static int prev_lineno = 0;
 210   const char *filename;
 211   const char *functionname;
 212   unsigned int lineno;
 213
 214   int mypc = get_reg (pc);
 215
 216   if (current_bfd == 0)
 217     return;
 218
 219   trace = 0;
 220
 221   if (!initted)
 222     {
 223       initted = 1;
 224       memset (&info, 0, sizeof (info));
 225       INIT_DISASSEMBLE_INFO (info, stdout, op_printf, op_styled_printf);
 226       info.read_memory_func = sim_dis_read;
 227       info.arch = bfd_get_arch (current_bfd);
 228       info.mach = bfd_get_mach (current_bfd);
 229       if (info.mach == 0)
 230         {
 231           info.arch = bfd_arch_m32c;
 232           info.mach = default_machine;
 233         }
 234       disassemble_init_for_target (&info);
 235
 236       storage = bfd_get_symtab_upper_bound (current_bfd);
 237       if (storage > 0)
 238         {
 239           symtab = (asymbol **) malloc (storage);
 240           symcount = bfd_canonicalize_symtab (current_bfd, symtab);
 241           symcount = remove_useless_symbols (symtab, symcount);
 242           qsort (symtab, symcount, sizeof (asymbol *), compare_symbols);
 243         }
 244       for (s = current_bfd->sections; s; s = s->next)
 245         {
 246           if (s->flags & SEC_CODE || code_section == 0)
 247             {
 248               code_section = s;
 249               code_base = bfd_section_lma (s);
 250               break;
 251             }
 252         }
 253     }
 254
 255   filename = functionname = 0;
 256   lineno = 0;
 257   if (bfd_find_nearest_line
 258       (current_bfd, code_section, symtab, mypc - code_base, &filename,
 259        &functionname, &lineno))
 260     {
 261       if (filename && functionname && lineno)
 262         {
 263           if (lineno != prev_lineno || strcmp (prev_filename, filename))
 264             {
 265               char *the_line = load_file_and_line (filename, lineno);
 266               const char *slash = strrchr (filename, '/');
 267               if (!slash)
 268                 slash = filename;
 269               else
 270                 slash++;
 271               printf
 272                 ("========================================"
 273                  "=====================================\n");
 274               printf ("\033[37;41m %s:%d: \033[33;40m %s\033[K\033[0m\n",
 275                       slash, lineno, the_line);
 276             }
 277           prev_lineno = lineno;
 278           prev_filename = filename;
 279         }
 280     }
 281
 282   {
 283     min = -1;
 284     max = symcount;
 285     while (min < max - 1)
 286       {
 287         bfd_vma sa;
 288         sym = (min + max) / 2;
 289         sa = bfd_asymbol_value (symtab[sym]);
 290         /*printf("checking %4d %08x %s\n",
 291            sym, sa, bfd_asymbol_name (symtab[sym])); */
 292         if (sa > mypc)
 293           max = sym;
 294         else if (sa < mypc)
 295           min = sym;
 296         else
 297           {
 298             min = sym;
 299             break;
 300           }
 301       }
 302     if (min != -1 && min != last_sym)
 303       {
 304         bestaddr = bfd_asymbol_value (symtab[min]);
 305         printf ("\033[43;30m%s", bfd_asymbol_name (symtab[min]));
 306         if (bestaddr != mypc)
 307           printf ("+%d", mypc - bestaddr);
 308         printf (":\t\t\t\033[0m\n");
 309         last_sym = min;
 310 #if 0
 311         if (trace == 1)
 312           if (strcmp (bfd_asymbol_name (symtab[min]), "abort") == 0
 313               || strcmp (bfd_asymbol_name (symtab[min]), "exit") == 0)
 314             trace = 0;
 315 #endif
 316       }
 317   }
 318
 319   opbuf[0] = 0;
 320   printf ("\033[33m%06x: ", mypc);
 321   max = print_insn_m32c (mypc, &info);
 322   for (i = 0; i < max; i++)
 323     printf ("%02x", mem_get_qi (mypc + i));
 324   for (; i < 6; i++)
 325     printf ("  ");
 326   printf ("%-16s  ", opbuf);
 327
 328   printf ("\033[0m\n");
 329   trace = save_trace;
 330 }