sim/lm32/sim-if.c

   1 /* Main simulator entry points specific to Lattice Mico32.
   2    Contributed by Jon Beniston <jon@beniston.com>
   3
   4    Copyright (C) 2009-2019 Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   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 #include "sim-main.h"
  22 #include "sim-options.h"
  23 #include "libiberty.h"
  24 #include "bfd.h"
  25
  26 #ifdef HAVE_STDLIB_H
  27 #include <stdlib.h>
  28 #endif
  29 \f
  30 /* Cover function of sim_state_free to free the cpu buffers as well.  */
  31
  32 static void
  33 free_state (SIM_DESC sd)
  34 {
  35   if (STATE_MODULES (sd) != NULL)
  36     sim_module_uninstall (sd);
  37   sim_cpu_free_all (sd);
  38   sim_state_free (sd);
  39 }
  40
  41 /* Find memory range used by program.  */
  42
  43 static unsigned long
  44 find_base (bfd *prog_bfd)
  45 {
  46   int found;
  47   unsigned long base = ~(0UL);
  48   asection *s;
  49
  50   found = 0;
  51   for (s = prog_bfd->sections; s; s = s->next)
  52     {
  53       if ((strcmp (bfd_section_name (s), ".boot") == 0)
  54           || (strcmp (bfd_section_name (s), ".text") == 0)
  55           || (strcmp (bfd_section_name (s), ".data") == 0)
  56           || (strcmp (bfd_section_name (s), ".bss") == 0))
  57         {
  58           if (!found)
  59             {
  60               base = bfd_section_vma (s);
  61               found = 1;
  62             }
  63           else
  64             base = bfd_section_vma (s) < base ? bfd_section_vma (s) : base;
  65         }
  66     }
  67   return base & ~(0xffffUL);
  68 }
  69
  70 static unsigned long
  71 find_limit (SIM_DESC sd)
  72 {
  73   bfd_vma addr;
  74
  75   addr = trace_sym_value (sd, "_fstack");
  76   if (addr == -1)
  77     return 0;
  78
  79   return (addr + 65536) & ~(0xffffUL);
  80 }
  81
  82 /* Create an instance of the simulator.  */
  83
  84 SIM_DESC
  85 sim_open (kind, callback, abfd, argv)
  86      SIM_OPEN_KIND kind;
  87      host_callback *callback;
  88      struct bfd *abfd;
  89      char * const *argv;
  90 {
  91   SIM_DESC sd = sim_state_alloc (kind, callback);
  92   char c;
  93   int i;
  94   unsigned long base, limit;
  95
  96   /* The cpu data is kept in a separately allocated chunk of memory.  */
  97   if (sim_cpu_alloc_all (sd, 1, cgen_cpu_max_extra_bytes ()) != SIM_RC_OK)
  98     {
  99       free_state (sd);
 100       return 0;
 101     }
 102
 103   if (sim_pre_argv_init (sd, argv[0]) != SIM_RC_OK)
 104     {
 105       free_state (sd);
 106       return 0;
 107     }
 108
 109   /* The parser will print an error message for us, so we silently return.  */
 110   if (sim_parse_args (sd, argv) != SIM_RC_OK)
 111     {
 112       free_state (sd);
 113       return 0;
 114     }
 115
 116 #if 0
 117   /* Allocate a handler for I/O devices
 118      if no memory for that range has been allocated by the user.
 119      All are allocated in one chunk to keep things from being
 120      unnecessarily complicated.  */
 121   if (sim_core_read_buffer (sd, NULL, read_map, &c, LM32_DEVICE_ADDR, 1) == 0)
 122     sim_core_attach (sd, NULL, 0 /*level */ ,
 123                      access_read_write, 0 /*space ??? */ ,
 124                      LM32_DEVICE_ADDR, LM32_DEVICE_LEN /*nr_bytes */ ,
 125                      0 /*modulo */ ,
 126                      &lm32_devices, NULL /*buffer */ );
 127 #endif
 128
 129   /* check for/establish the reference program image.  */
 130   if (sim_analyze_program (sd,
 131                            (STATE_PROG_ARGV (sd) != NULL
 132                             ? *STATE_PROG_ARGV (sd)
 133                             : NULL), abfd) != SIM_RC_OK)
 134     {
 135       free_state (sd);
 136       return 0;
 137     }
 138
 139   /* Check to see if memory exists at programs start address.  */
 140   if (sim_core_read_buffer (sd, NULL, read_map, &c, STATE_START_ADDR (sd), 1)
 141       == 0)
 142     {
 143       if (STATE_PROG_BFD (sd) != NULL)
 144         {
 145           /* It doesn't, so we should try to allocate enough memory to hold program.  */
 146           base = find_base (STATE_PROG_BFD (sd));
 147           limit = find_limit (sd);
 148           if (limit == 0)
 149             {
 150               sim_io_eprintf (sd,
 151                               "Failed to find symbol _fstack in program. You must specify memory regions with --memory-region.\n");
 152               free_state (sd);
 153               return 0;
 154             }
 155           /*sim_io_printf (sd, "Allocating memory at 0x%x size 0x%x\n", base, limit); */
 156           sim_do_commandf (sd, "memory region 0x%x,0x%x", base, limit);
 157         }
 158     }
 159
 160   /* Establish any remaining configuration options.  */
 161   if (sim_config (sd) != SIM_RC_OK)
 162     {
 163       free_state (sd);
 164       return 0;
 165     }
 166
 167   if (sim_post_argv_init (sd) != SIM_RC_OK)
 168     {
 169       free_state (sd);
 170       return 0;
 171     }
 172
 173   /* Open a copy of the cpu descriptor table.  */
 174   {
 175     CGEN_CPU_DESC cd =
 176       lm32_cgen_cpu_open_1 (STATE_ARCHITECTURE (sd)->printable_name,
 177                             CGEN_ENDIAN_BIG);
 178     for (i = 0; i < MAX_NR_PROCESSORS; ++i)
 179       {
 180         SIM_CPU *cpu = STATE_CPU (sd, i);
 181         CPU_CPU_DESC (cpu) = cd;
 182         CPU_DISASSEMBLER (cpu) = sim_cgen_disassemble_insn;
 183       }
 184     lm32_cgen_init_dis (cd);
 185   }
 186
 187   /* Initialize various cgen things not done by common framework.
 188      Must be done after lm32_cgen_cpu_open.  */
 189   cgen_init (sd);
 190
 191   return sd;
 192 }
 193 \f
 194 SIM_RC
 195 sim_create_inferior (sd, abfd, argv, envp)
 196      SIM_DESC sd;
 197      struct bfd *abfd;
 198      char * const *argv;
 199      char * const *envp;
 200 {
 201   SIM_CPU *current_cpu = STATE_CPU (sd, 0);
 202   SIM_ADDR addr;
 203
 204   if (abfd != NULL)
 205     addr = bfd_get_start_address (abfd);
 206   else
 207     addr = 0;
 208   sim_pc_set (current_cpu, addr);
 209
 210   /* Standalone mode (i.e. `run`) will take care of the argv for us in
 211      sim_open() -> sim_parse_args().  But in debug mode (i.e. 'target sim'
 212      with `gdb`), we need to handle it because the user can change the
 213      argv on the fly via gdb's 'run'.  */
 214   if (STATE_PROG_ARGV (sd) != argv)
 215     {
 216       freeargv (STATE_PROG_ARGV (sd));
 217       STATE_PROG_ARGV (sd) = dupargv (argv);
 218     }
 219
 220   return SIM_RC_OK;
 221 }