sim/common/sim-syscall.c

   1 /* Simulator system call support.
   2
   3    Copyright 2002-2020 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 #include "config.h"
  21
  22 #include <errno.h>
  23
  24 #include "sim-main.h"
  25 #include "sim-syscall.h"
  26 #include "targ-vals.h"
  27 \f
  28 /* Read/write functions for system call interface.  */
  29
  30 int
  31 sim_syscall_read_mem (host_callback *cb ATTRIBUTE_UNUSED, struct cb_syscall *sc,
  32                       unsigned long taddr, char *buf, int bytes)
  33 {
  34   SIM_DESC sd = (SIM_DESC) sc->p1;
  35   SIM_CPU *cpu = (SIM_CPU *) sc->p2;
  36
  37   TRACE_MEMORY (cpu, "READ (syscall) %i bytes @ 0x%08lx", bytes, taddr);
  38
  39   return sim_core_read_buffer (sd, cpu, read_map, buf, taddr, bytes);
  40 }
  41
  42 int
  43 sim_syscall_write_mem (host_callback *cb ATTRIBUTE_UNUSED, struct cb_syscall *sc,
  44                        unsigned long taddr, const char *buf, int bytes)
  45 {
  46   SIM_DESC sd = (SIM_DESC) sc->p1;
  47   SIM_CPU *cpu = (SIM_CPU *) sc->p2;
  48
  49   TRACE_MEMORY (cpu, "WRITE (syscall) %i bytes @ 0x%08lx", bytes, taddr);
  50
  51   return sim_core_write_buffer (sd, cpu, write_map, buf, taddr, bytes);
  52 }
  53 \f
  54 /* Main syscall callback for simulators.  */
  55
  56 void
  57 sim_syscall_multi (SIM_CPU *cpu, int func, long arg1, long arg2, long arg3,
  58                    long arg4, long *result, long *result2, int *errcode)
  59 {
  60   SIM_DESC sd = CPU_STATE (cpu);
  61   host_callback *cb = STATE_CALLBACK (sd);
  62   CB_SYSCALL sc;
  63   const char unknown_syscall[] = "<UNKNOWN SYSCALL>";
  64   const char *syscall;
  65
  66   CB_SYSCALL_INIT (&sc);
  67
  68   sc.func = func;
  69   sc.arg1 = arg1;
  70   sc.arg2 = arg2;
  71   sc.arg3 = arg3;
  72   sc.arg4 = arg4;
  73
  74   sc.p1 = (PTR) sd;
  75   sc.p2 = (PTR) cpu;
  76   sc.read_mem = sim_syscall_read_mem;
  77   sc.write_mem = sim_syscall_write_mem;
  78
  79   if (cb_syscall (cb, &sc) != CB_RC_OK)
  80     {
  81       /* The cb_syscall func never returns an error, so this is more of a
  82          sanity check.  */
  83       sim_engine_abort (sd, cpu, sim_pc_get (cpu), "cb_syscall failed");
  84     }
  85
  86   syscall = cb_target_str_syscall (cb, func);
  87   if (!syscall)
  88     syscall = unknown_syscall;
  89
  90   if (sc.result == -1)
  91     TRACE_SYSCALL (cpu, "%s[%i](%#lx, %#lx, %#lx) = %li (error = %s[%i])",
  92                    syscall, func, arg1, arg2, arg3, sc.result,
  93                    cb_target_str_errno (cb, sc.errcode), sc.errcode);
  94   else
  95     TRACE_SYSCALL (cpu, "%s[%i](%#lx, %#lx, %#lx) = %li",
  96                    syscall, func, arg1, arg2, arg3, sc.result);
  97
  98   if (cb_target_to_host_syscall (cb, func) == CB_SYS_exit)
  99     sim_engine_halt (sd, cpu, NULL, sim_pc_get (cpu), sim_exited, arg1);
 100
 101   *result = sc.result;
 102   *result2 = sc.result2;
 103   *errcode = sc.errcode;
 104 }
 105
 106 long
 107 sim_syscall (SIM_CPU *cpu, int func, long arg1, long arg2, long arg3, long arg4)
 108 {
 109   long result, result2;
 110   int errcode;
 111
 112   sim_syscall_multi (cpu, func, arg1, arg2, arg3, arg4, &result, &result2,
 113                      &errcode);
 114   if (result == -1)
 115     return -errcode;
 116   else
 117     return result;
 118 }