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) 2009-2021 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 "sim-main.h"
  25 #include "sim-options.h"
  26 #include "libiberty.h"
  27 #include "bfd.h"
  28
  29 #include <stdlib.h>
  30 \f
  31 /* Cover function of sim_state_free to free the cpu buffers as well.  */
  32
  33 static void
  34 free_state (SIM_DESC sd)
  35 {
  36   if (STATE_MODULES (sd) != NULL)
  37     sim_module_uninstall (sd);
  38   sim_cpu_free_all (sd);
  39   sim_state_free (sd);
  40 }
  41
  42 /* Find memory range used by program.  */
  43
  44 static unsigned long
  45 find_base (bfd *prog_bfd)
  46 {
  47   int found;
  48   unsigned long base = ~(0UL);
  49   asection *s;
  50
  51   found = 0;
  52   for (s = prog_bfd->sections; s; s = s->next)
  53     {
  54       if ((strcmp (bfd_section_name (s), ".boot") == 0)
  55           || (strcmp (bfd_section_name (s), ".text") == 0)
  56           || (strcmp (bfd_section_name (s), ".data") == 0)
  57           || (strcmp (bfd_section_name (s), ".bss") == 0))
  58         {
  59           if (!found)
  60             {
  61               base = bfd_section_vma (s);
  62               found = 1;
  63             }
  64           else
  65             base = bfd_section_vma (s) < base ? bfd_section_vma (s) : base;
  66         }
  67     }
  68   return base & ~(0xffffUL);
  69 }
  70
  71 static unsigned long
  72 find_limit (SIM_DESC sd)
  73 {
  74   bfd_vma addr;
  75
  76   addr = trace_sym_value (sd, "_fstack");
  77   if (addr == -1)
  78     return 0;
  79
  80   return (addr + 65536) & ~(0xffffUL);
  81 }
  82
  83 extern const SIM_MACH * const lm32_sim_machs[];
  84
  85 /* Create an instance of the simulator.  */
  86
  87 SIM_DESC
  88 sim_open (SIM_OPEN_KIND kind, host_callback *callback, 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   /* Set default options before parsing user options.  */
  97   STATE_MACHS (sd) = lm32_sim_machs;
  98   current_alignment = STRICT_ALIGNMENT;
  99   current_target_byte_order = BFD_ENDIAN_BIG;
 100
 101   /* The cpu data is kept in a separately allocated chunk of memory.  */
 102   if (sim_cpu_alloc_all (sd, 1) != SIM_RC_OK)
 103     {
 104       free_state (sd);
 105       return 0;
 106     }
 107
 108   if (sim_pre_argv_init (sd, argv[0]) != SIM_RC_OK)
 109     {
 110       free_state (sd);
 111       return 0;
 112     }
 113
 114   /* The parser will print an error message for us, so we silently return.  */
 115   if (sim_parse_args (sd, argv) != SIM_RC_OK)
 116     {
 117       free_state (sd);
 118       return 0;
 119     }
 120
 121 #if 0
 122   /* Allocate a handler for I/O devices
 123      if no memory for that range has been allocated by the user.
 124      All are allocated in one chunk to keep things from being
 125      unnecessarily complicated.  */
 126   if (sim_core_read_buffer (sd, NULL, read_map, &c, LM32_DEVICE_ADDR, 1) == 0)
 127     sim_core_attach (sd, NULL, 0 /*level */ ,
 128                      access_read_write, 0 /*space ??? */ ,
 129                      LM32_DEVICE_ADDR, LM32_DEVICE_LEN /*nr_bytes */ ,
 130                      0 /*modulo */ ,
 131                      &lm32_devices, NULL /*buffer */ );
 132 #endif
 133
 134   /* check for/establish the reference program image.  */
 135   if (sim_analyze_program (sd,
 136                            (STATE_PROG_ARGV (sd) != NULL
 137                             ? *STATE_PROG_ARGV (sd)
 138                             : NULL), abfd) != SIM_RC_OK)
 139     {
 140       free_state (sd);
 141       return 0;
 142     }
 143
 144   /* Check to see if memory exists at programs start address.  */
 145   if (sim_core_read_buffer (sd, NULL, read_map, &c, STATE_START_ADDR (sd), 1)
 146       == 0)
 147     {
 148       if (STATE_PROG_BFD (sd) != NULL)
 149         {
 150           /* It doesn't, so we should try to allocate enough memory to hold program.  */
 151           base = find_base (STATE_PROG_BFD (sd));
 152           limit = find_limit (sd);
 153           if (limit == 0)
 154             {
 155               sim_io_eprintf (sd,
 156                               "Failed to find symbol _fstack in program. You must specify memory regions with --memory-region.\n");
 157               free_state (sd);
 158               return 0;
 159             }
 160           /*sim_io_printf (sd, "Allocating memory at 0x%x size 0x%x\n", base, limit); */
 161           sim_do_commandf (sd, "memory region 0x%x,0x%x", base, limit);
 162         }
 163     }
 164
 165   /* Establish any remaining configuration options.  */
 166   if (sim_config (sd) != SIM_RC_OK)
 167     {
 168       free_state (sd);
 169       return 0;
 170     }
 171
 172   if (sim_post_argv_init (sd) != SIM_RC_OK)
 173     {
 174       free_state (sd);
 175       return 0;
 176     }
 177
 178   /* Open a copy of the cpu descriptor table.  */
 179   {
 180     CGEN_CPU_DESC cd =
 181       lm32_cgen_cpu_open_1 (STATE_ARCHITECTURE (sd)->printable_name,
 182                             CGEN_ENDIAN_BIG);
 183     for (i = 0; i < MAX_NR_PROCESSORS; ++i)
 184       {
 185         SIM_CPU *cpu = STATE_CPU (sd, i);
 186         CPU_CPU_DESC (cpu) = cd;
 187         CPU_DISASSEMBLER (cpu) = sim_cgen_disassemble_insn;
 188       }
 189     lm32_cgen_init_dis (cd);
 190   }
 191
 192   return sd;
 193 }
 194 \f
 195 SIM_RC
 196 sim_create_inferior (SIM_DESC sd, struct bfd *abfd, char * const *argv,
 197                      char * const *envp)
 198 {
 199   SIM_CPU *current_cpu = STATE_CPU (sd, 0);
 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   return SIM_RC_OK;
 219 }