sim/msp430/trace.c

   1 /* trace.c --- tracing output for the MSP430 simulator.
   2
   3    Copyright (C) 2005-2014 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 static int
  37 sim_dis_read (bfd_vma memaddr, bfd_byte * ptr, unsigned int length,
  38               struct disassemble_info *info)
  39 {
  40   return 0;
  41 }
  42
  43 /* Filter out (in place) symbols that are useless for disassembly.
  44    COUNT is the number of elements in SYMBOLS.
  45    Return the number of useful symbols. */
  46
  47 static long
  48 remove_useless_symbols (asymbol ** symbols, long count)
  49 {
  50   asymbol **in_ptr = symbols, **out_ptr = symbols;
  51
  52   while (-- count >= 0)
  53     {
  54       asymbol *sym = *in_ptr ++;
  55
  56       if (strstr (sym->name, "gcc2_compiled"))
  57         continue;
  58       if (sym->name == NULL || sym->name[0] == '\0')
  59         continue;
  60       if (sym->flags & (BSF_DEBUGGING))
  61         continue;
  62       if (bfd_is_und_section (sym->section)
  63           || bfd_is_com_section (sym->section))
  64         continue;
  65
  66       if (sym->name[0] == '.' && sym->name[1] == 'L')
  67         continue;
  68
  69       /* If the symbol ends in ^A or ^B it is
  70          an assembler generated local label.  */
  71       if (sym->name[strlen (sym->name) - 1] < 32)
  72         continue;
  73
  74       *out_ptr++ = sym;
  75     }
  76   return out_ptr - symbols;
  77 }
  78
  79 static int
  80 compare_symbols (const PTR ap, const PTR bp)
  81 {
  82   const asymbol *a = *(const asymbol **) ap;
  83   const asymbol *b = *(const asymbol **) bp;
  84
  85   if (bfd_asymbol_value (a) > bfd_asymbol_value (b))
  86     return 1;
  87   else if (bfd_asymbol_value (a) < bfd_asymbol_value (b))
  88     return -1;
  89   return 0;
  90 }
  91
  92 static char opbuf[1000];
  93
  94 static int
  95 op_printf (char *buf, char *fmt, ...)
  96 {
  97   int ret;
  98   va_list ap;
  99
 100   va_start (ap, fmt);
 101   ret = vsprintf (opbuf + strlen (opbuf), fmt, ap);
 102   va_end (ap);
 103   return ret;
 104 }
 105
 106 static bfd *       current_bfd = NULL;
 107 static asymbol **  symtab = NULL;
 108 static int         symcount = 0;
 109 static asection *  code_section = NULL;
 110 static bfd_vma     code_base = 0;
 111 static struct disassemble_info info;
 112
 113 void
 114 msp430_trace_init (bfd *prog)
 115 {
 116   current_bfd = prog;
 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 msp430_get_current_source_location (int mypc,
 188                                     const char **  pfilename,
 189                                     const char **  pfunctionname,
 190                                     unsigned int * plineno)
 191 {
 192   static int   initted = 0;
 193
 194   if (current_bfd == NULL)
 195     {
 196       printf("no bfd\n");
 197       return 0;
 198     }
 199
 200   if (!initted)
 201     {
 202       int storage;
 203       asection * s;
 204
 205       initted = 1;
 206       memset (& info, 0, sizeof (info));
 207       INIT_DISASSEMBLE_INFO (info, stdout, op_printf);
 208       info.read_memory_func = sim_dis_read;
 209       info.arch = bfd_get_arch (current_bfd);
 210       info.mach = bfd_get_mach (current_bfd);
 211       if (info.mach == 0)
 212         info.arch = bfd_arch_msp430;
 213
 214       disassemble_init_for_target (& info);
 215
 216       storage = bfd_get_symtab_upper_bound (current_bfd);
 217       if (storage > 0)
 218         {
 219           symtab = (asymbol **) xmalloc (storage);
 220           symcount = bfd_canonicalize_symtab (current_bfd, symtab);
 221           symcount = remove_useless_symbols (symtab, symcount);
 222           qsort (symtab, symcount, sizeof (asymbol *), compare_symbols);
 223         }
 224
 225       for (s = current_bfd->sections; s; s = s->next)
 226         {
 227           if (s->flags & SEC_CODE || code_section == 0)
 228             {
 229               code_section = s;
 230               code_base = bfd_section_lma (current_bfd, s);
 231               break;
 232             }
 233         }
 234     }
 235
 236   *pfilename = *pfunctionname = NULL;
 237   *plineno = 0;
 238
 239   bfd_find_nearest_line
 240     (current_bfd, code_section, symtab, mypc - code_base,
 241      pfilename, pfunctionname, plineno);
 242
 243   return 1;
 244 }
 245
 246 void
 247 msp430_trace_one (int mypc)
 248 {
 249   static int           last_sym = -1;
 250   static const char *  prev_filename = "";
 251   static int           prev_lineno = 0;
 252   const char *  filename;
 253   const char *  functionname;
 254   unsigned int  lineno;
 255   int           sym, bestaddr;
 256   int           min, max, i;
 257
 258   if (! msp430_get_current_source_location (mypc, & filename, & functionname, & lineno))
 259     return;
 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
 268           if (!slash)
 269             slash = filename;
 270           else
 271             slash ++;
 272           fprintf
 273             (stderr, "========================================"
 274              "=====================================\n");
 275           fprintf (stderr, "\033[37;41m %s:%d: \033[33;40m %s\033[K\033[0m\n",
 276                   slash, lineno, the_line);
 277         }
 278       prev_lineno = lineno;
 279       prev_filename = filename;
 280     }
 281
 282   min = -1;
 283   max = symcount;
 284   while (min < max - 1)
 285     {
 286       bfd_vma sa;
 287
 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
 303   if (min != -1 && min != last_sym)
 304     {
 305       bestaddr = bfd_asymbol_value (symtab[min]);
 306       fprintf (stderr, "\033[43;30m%s", bfd_asymbol_name (symtab[min]));
 307       if (bestaddr != mypc)
 308         fprintf (stderr, "+%d", mypc - bestaddr);
 309       fprintf (stderr, ":\t\t\t\033[0m\n");
 310       last_sym = min;
 311 #if 0
 312       if (trace == 1)
 313         if (strcmp (bfd_asymbol_name (symtab[min]), "abort") == 0
 314             || strcmp (bfd_asymbol_name (symtab[min]), "exit") == 0)
 315           trace = 0;
 316 #endif
 317     }
 318 }