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) 2009-2022 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 /* This must come before any other includes.  */
  22 #include "defs.h"
  23
  24 #include <stdlib.h>
  25
  26 #include "sim/callback.h"
  27 #include "sim-main.h"
  28 #include "sim-options.h"
  29 #include "libiberty.h"
  30 #include "bfd.h"
  31 \f
  32 /* Cover function of sim_state_free to free the cpu buffers as well.  */
  33
  34 static void
  35 free_state (SIM_DESC sd)
  36 {
  37   if (STATE_MODULES (sd) != NULL)
  38     sim_module_uninstall (sd);
  39   sim_cpu_free_all (sd);
  40   sim_state_free (sd);
  41 }
  42
  43 /* Find memory range used by program.  */
  44
  45 static unsigned long
  46 find_base (bfd *prog_bfd)
  47 {
  48   int found;
  49   unsigned long base = ~(0UL);
  50   asection *s;
  51
  52   found = 0;
  53   for (s = prog_bfd->sections; s; s = s->next)
  54     {
  55       if ((strcmp (bfd_section_name (s), ".boot") == 0)
  56           || (strcmp (bfd_section_name (s), ".text") == 0)
  57           || (strcmp (bfd_section_name (s), ".data") == 0)
  58           || (strcmp (bfd_section_name (s), ".bss") == 0))
  59         {
  60           if (!found)
  61             {
  62               base = bfd_section_vma (s);
  63               found = 1;
  64             }
  65           else
  66             base = bfd_section_vma (s) < base ? bfd_section_vma (s) : base;
  67         }
  68     }
  69   return base & ~(0xffffUL);
  70 }
  71
  72 static unsigned long
  73 find_limit (SIM_DESC sd)
  74 {
  75   bfd_vma addr;
  76
  77   addr = trace_sym_value (sd, "_fstack");
  78   if (addr == -1)
  79     return 0;
  80
  81   return (addr + 65536) & ~(0xffffUL);
  82 }
  83
  84 extern const SIM_MACH * const lm32_sim_machs[];
  85
  86 /* Create an instance of the simulator.  */
  87
  88 SIM_DESC
  89 sim_open (SIM_OPEN_KIND kind, host_callback *callback, struct bfd *abfd,
  90           char * const *argv)
  91 {
  92   SIM_DESC sd = sim_state_alloc (kind, callback);
  93   char c;
  94   int i;
  95   unsigned long base, limit;
  96
  97   /* Set default options before parsing user options.  */
  98   STATE_MACHS (sd) = lm32_sim_machs;
  99   STATE_MODEL_NAME (sd) = "lm32";
 100   current_alignment = STRICT_ALIGNMENT;
 101   current_target_byte_order = BFD_ENDIAN_BIG;
 102
 103   /* The cpu data is kept in a separately allocated chunk of memory.  */
 104   if (sim_cpu_alloc_all (sd, 1) != SIM_RC_OK)
 105     {
 106       free_state (sd);
 107       return 0;
 108     }
 109
 110   if (sim_pre_argv_init (sd, argv[0]) != SIM_RC_OK)
 111     {
 112       free_state (sd);
 113       return 0;
 114     }
 115
 116   /* The parser will print an error message for us, so we silently return.  */
 117   if (sim_parse_args (sd, argv) != SIM_RC_OK)
 118     {
 119       free_state (sd);
 120       return 0;
 121     }
 122
 123 #if 0
 124   /* Allocate a handler for I/O devices
 125      if no memory for that range has been allocated by the user.
 126      All are allocated in one chunk to keep things from being
 127      unnecessarily complicated.  */
 128   if (sim_core_read_buffer (sd, NULL, read_map, &c, LM32_DEVICE_ADDR, 1) == 0)
 129     sim_core_attach (sd, NULL, 0 /*level */ ,
 130                      access_read_write, 0 /*space ??? */ ,
 131                      LM32_DEVICE_ADDR, LM32_DEVICE_LEN /*nr_bytes */ ,
 132                      0 /*modulo */ ,
 133                      &lm32_devices, NULL /*buffer */ );
 134 #endif
 135
 136   /* check for/establish the reference program image.  */
 137   if (sim_analyze_program (sd, STATE_PROG_FILE (sd), abfd) != SIM_RC_OK)
 138     {
 139       free_state (sd);
 140       return 0;
 141     }
 142
 143   /* Check to see if memory exists at programs start address.  */
 144   if (sim_core_read_buffer (sd, NULL, read_map, &c, STATE_START_ADDR (sd), 1)
 145       == 0)
 146     {
 147       if (STATE_PROG_BFD (sd) != NULL)
 148         {
 149           /* It doesn't, so we should try to allocate enough memory to hold program.  */
 150           base = find_base (STATE_PROG_BFD (sd));
 151           limit = find_limit (sd);
 152           if (limit == 0)
 153             {
 154               sim_io_eprintf (sd,
 155                               "Failed to find symbol _fstack in program. You must specify memory regions with --memory-region.\n");
 156               free_state (sd);
 157               return 0;
 158             }
 159           /*sim_io_printf (sd, "Allocating memory at 0x%lx size 0x%lx\n", base, limit); */
 160           sim_do_commandf (sd, "memory region 0x%lx,0x%lx", base, limit);
 161         }
 162     }
 163
 164   /* Establish any remaining configuration options.  */
 165   if (sim_config (sd) != SIM_RC_OK)
 166     {
 167       free_state (sd);
 168       return 0;
 169     }
 170
 171   if (sim_post_argv_init (sd) != SIM_RC_OK)
 172     {
 173       free_state (sd);
 174       return 0;
 175     }
 176
 177   /* Open a copy of the cpu descriptor table.  */
 178   {
 179     CGEN_CPU_DESC cd =
 180       lm32_cgen_cpu_open_1 (STATE_ARCHITECTURE (sd)->printable_name,
 181                             CGEN_ENDIAN_BIG);
 182     for (i = 0; i < MAX_NR_PROCESSORS; ++i)
 183       {
 184         SIM_CPU *cpu = STATE_CPU (sd, i);
 185         CPU_CPU_DESC (cpu) = cd;
 186         CPU_DISASSEMBLER (cpu) = sim_cgen_disassemble_insn;
 187       }
 188     lm32_cgen_init_dis (cd);
 189   }
 190
 191   return sd;
 192 }
 193 \f
 194 SIM_RC
 195 sim_create_inferior (SIM_DESC sd, struct bfd *abfd, char * const *argv,
 196                      char * const *env)
 197 {
 198   SIM_CPU *current_cpu = STATE_CPU (sd, 0);
 199   host_callback *cb = STATE_CALLBACK (sd);
 200   SIM_ADDR addr;
 201
 202   if (abfd != NULL)
 203     addr = bfd_get_start_address (abfd);
 204   else
 205     addr = 0;
 206   sim_pc_set (current_cpu, addr);
 207
 208   /* Standalone mode (i.e. `run`) will take care of the argv for us in
 209      sim_open() -> sim_parse_args().  But in debug mode (i.e. 'target sim'
 210      with `gdb`), we need to handle it because the user can change the
 211      argv on the fly via gdb's 'run'.  */
 212   if (STATE_PROG_ARGV (sd) != argv)
 213     {
 214       freeargv (STATE_PROG_ARGV (sd));
 215       STATE_PROG_ARGV (sd) = dupargv (argv);
 216     }
 217
 218   if (STATE_PROG_ENVP (sd) != env)
 219     {
 220       freeargv (STATE_PROG_ENVP (sd));
 221       STATE_PROG_ENVP (sd) = dupargv (env);
 222     }
 223
 224   cb->argv = STATE_PROG_ARGV (sd);
 225   cb->envp = STATE_PROG_ENVP (sd);
 226
 227   return SIM_RC_OK;
 228 }