sim/common/sim-syscall.c

   1 /* Simulator system call support.
   2
   3    Copyright 2002-2021 Free Software Foundation, Inc.
   4
   5    This file is part of simulators.
   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 <errno.h>
  24
  25 #include "sim-main.h"
  26 #include "sim-syscall.h"
  27 #include "sim/callback.h"
  28 #include "targ-vals.h"
  29 \f
  30 /* Read/write functions for system call interface.  */
  31
  32 int
  33 sim_syscall_read_mem (host_callback *cb ATTRIBUTE_UNUSED, struct cb_syscall *sc,
  34                       unsigned long taddr, char *buf, int bytes)
  35 {
  36   SIM_DESC sd = (SIM_DESC) sc->p1;
  37   SIM_CPU *cpu = (SIM_CPU *) sc->p2;
  38
  39   TRACE_MEMORY (cpu, "READ (syscall) %i bytes @ 0x%08lx", bytes, taddr);
  40
  41   return sim_core_read_buffer (sd, cpu, read_map, buf, taddr, bytes);
  42 }
  43
  44 int
  45 sim_syscall_write_mem (host_callback *cb ATTRIBUTE_UNUSED, struct cb_syscall *sc,
  46                        unsigned long taddr, const char *buf, int bytes)
  47 {
  48   SIM_DESC sd = (SIM_DESC) sc->p1;
  49   SIM_CPU *cpu = (SIM_CPU *) sc->p2;
  50
  51   TRACE_MEMORY (cpu, "WRITE (syscall) %i bytes @ 0x%08lx", bytes, taddr);
  52
  53   return sim_core_write_buffer (sd, cpu, write_map, buf, taddr, bytes);
  54 }
  55 \f
  56 /* Main syscall callback for simulators.  */
  57
  58 void
  59 sim_syscall_multi (SIM_CPU *cpu, int func, long arg1, long arg2, long arg3,
  60                    long arg4, long *result, long *result2, int *errcode)
  61 {
  62   SIM_DESC sd = CPU_STATE (cpu);
  63   host_callback *cb = STATE_CALLBACK (sd);
  64   CB_SYSCALL sc;
  65   const char unknown_syscall[] = "<UNKNOWN SYSCALL>";
  66   const char *syscall;
  67
  68   CB_SYSCALL_INIT (&sc);
  69
  70   sc.func = func;
  71   sc.arg1 = arg1;
  72   sc.arg2 = arg2;
  73   sc.arg3 = arg3;
  74   sc.arg4 = arg4;
  75
  76   sc.p1 = sd;
  77   sc.p2 = cpu;
  78   sc.read_mem = sim_syscall_read_mem;
  79   sc.write_mem = sim_syscall_write_mem;
  80
  81   if (cb_syscall (cb, &sc) != CB_RC_OK)
  82     {
  83       /* The cb_syscall func never returns an error, so this is more of a
  84          sanity check.  */
  85       sim_engine_abort (sd, cpu, sim_pc_get (cpu), "cb_syscall failed");
  86     }
  87
  88   syscall = cb_target_str_syscall (cb, func);
  89   if (!syscall)
  90     syscall = unknown_syscall;
  91
  92   if (sc.result == -1)
  93     TRACE_SYSCALL (cpu, "%s[%i](%#lx, %#lx, %#lx) = %li (error = %s[%i])",
  94                    syscall, func, arg1, arg2, arg3, sc.result,
  95                    cb_target_str_errno (cb, sc.errcode), sc.errcode);
  96   else
  97     TRACE_SYSCALL (cpu, "%s[%i](%#lx, %#lx, %#lx) = %li",
  98                    syscall, func, arg1, arg2, arg3, sc.result);
  99
 100   if (cb_target_to_host_syscall (cb, func) == CB_SYS_exit)
 101     sim_engine_halt (sd, cpu, NULL, sim_pc_get (cpu), sim_exited, arg1);
 102
 103   *result = sc.result;
 104   *result2 = sc.result2;
 105   *errcode = sc.errcode;
 106 }
 107
 108 long
 109 sim_syscall (SIM_CPU *cpu, int func, long arg1, long arg2, long arg3, long arg4)
 110 {
 111   long result, result2;
 112   int errcode;
 113
 114   sim_syscall_multi (cpu, func, arg1, arg2, arg3, arg4, &result, &result2,
 115                      &errcode);
 116   if (result == -1)
 117     return -errcode;
 118   else
 119     return result;
 120 }