sim/common/sim-cpu.c

   1 /* CPU support.
   2    Copyright (C) 1998-2024 Free Software Foundation, Inc.
   3    Contributed by Cygnus Solutions.
   4
   5 This file is part of GDB, the GNU debugger.
   6
   7 This program is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 3 of the License, or
  10 (at your option) any later version.
  11
  12 This program is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 /* This must come before any other includes.  */
  21 #include "defs.h"
  22
  23 #include <stdlib.h>
  24
  25 #include "bfd.h"
  26
  27 #include "sim-main.h"
  28
  29 /* Allocate space for all cpus in the simulator.
  30    Space for the cpu must currently exist prior to parsing ARGV.  */
  31 /* ??? wip.  better solution must wait.  */
  32
  33 SIM_RC
  34 sim_cpu_alloc_all_extra (SIM_DESC sd, int ncpus, size_t extra_bytes)
  35 {
  36   int c;
  37
  38   /* TODO: This should be a command line option for users to control.  */
  39   if (ncpus == 0)
  40     ncpus = MAX_NR_PROCESSORS;
  41
  42   for (c = 0; c < ncpus; ++c)
  43     STATE_CPU (sd, c) = sim_cpu_alloc_extra (sd, extra_bytes);
  44
  45   return SIM_RC_OK;
  46 }
  47
  48 /* Allocate space for a cpu object.
  49    EXTRA_BYTES is additional space to allocate for the sim_cpu struct.  */
  50
  51 sim_cpu *
  52 sim_cpu_alloc_extra (SIM_DESC sd, size_t extra_bytes)
  53 {
  54   sim_cpu *cpu = zalloc (sizeof (*cpu));
  55
  56 #ifndef CGEN_ARCH
  57 # define cgen_cpu_max_extra_bytes(sd) 0
  58 #endif
  59   extra_bytes += cgen_cpu_max_extra_bytes (sd);
  60   if (extra_bytes)
  61     CPU_ARCH_DATA (cpu) = zalloc (extra_bytes);
  62
  63   return cpu;
  64 }
  65
  66 /* Free all resources held by all cpus.  */
  67
  68 void
  69 sim_cpu_free_all (SIM_DESC sd)
  70 {
  71   int c;
  72
  73   for (c = 0; c < MAX_NR_PROCESSORS; ++c)
  74     if (STATE_CPU (sd, c))
  75       sim_cpu_free (STATE_CPU (sd, c));
  76 }
  77
  78 /* Free all resources used by CPU.  */
  79
  80 void
  81 sim_cpu_free (sim_cpu *cpu)
  82 {
  83   free (CPU_ARCH_DATA (cpu));
  84   free (cpu);
  85 }
  86 \f
  87 /* PC utilities.  */
  88
  89 sim_cia
  90 sim_pc_get (sim_cpu *cpu)
  91 {
  92   return (* CPU_PC_FETCH (cpu)) (cpu);
  93 }
  94
  95 void
  96 sim_pc_set (sim_cpu *cpu, sim_cia newval)
  97 {
  98   (* CPU_PC_STORE (cpu)) (cpu, newval);
  99 }