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/* Simulator system call support.
Copyright 2002-2021 Free Software Foundation, Inc.
This file is part of simulators.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* This must come before any other includes. */
#include "defs.h"
#include <errno.h>
#include "ansidecl.h"
#include "sim-main.h"
#include "sim-syscall.h"
#include "sim/callback.h"
/* Read/write functions for system call interface. */
int
sim_syscall_read_mem (host_callback *cb ATTRIBUTE_UNUSED, struct cb_syscall *sc,
unsigned long taddr, char *buf, int bytes)
{
SIM_DESC sd = (SIM_DESC) sc->p1;
SIM_CPU *cpu = (SIM_CPU *) sc->p2;
TRACE_MEMORY (cpu, "READ (syscall) %i bytes @ 0x%08lx", bytes, taddr);
return sim_core_read_buffer (sd, cpu, read_map, buf, taddr, bytes);
}
int
sim_syscall_write_mem (host_callback *cb ATTRIBUTE_UNUSED, struct cb_syscall *sc,
unsigned long taddr, const char *buf, int bytes)
{
SIM_DESC sd = (SIM_DESC) sc->p1;
SIM_CPU *cpu = (SIM_CPU *) sc->p2;
TRACE_MEMORY (cpu, "WRITE (syscall) %i bytes @ 0x%08lx", bytes, taddr);
return sim_core_write_buffer (sd, cpu, write_map, buf, taddr, bytes);
}
/* Main syscall callback for simulators. */
void
sim_syscall_multi (SIM_CPU *cpu, int func, long arg1, long arg2, long arg3,
long arg4, long *result, long *result2, int *errcode)
{
SIM_DESC sd = CPU_STATE (cpu);
host_callback *cb = STATE_CALLBACK (sd);
CB_SYSCALL sc;
const char unknown_syscall[] = "<UNKNOWN SYSCALL>";
const char *syscall;
CB_SYSCALL_INIT (&sc);
sc.func = func;
sc.arg1 = arg1;
sc.arg2 = arg2;
sc.arg3 = arg3;
sc.arg4 = arg4;
sc.p1 = sd;
sc.p2 = cpu;
sc.read_mem = sim_syscall_read_mem;
sc.write_mem = sim_syscall_write_mem;
if (cb_syscall (cb, &sc) != CB_RC_OK)
{
/* The cb_syscall func never returns an error, so this is more of a
sanity check. */
sim_engine_abort (sd, cpu, sim_pc_get (cpu), "cb_syscall failed");
}
syscall = cb_target_str_syscall (cb, func);
if (!syscall)
syscall = unknown_syscall;
if (sc.result == -1)
TRACE_SYSCALL (cpu, "%s[%i](%#lx, %#lx, %#lx) = %li (error = %s[%i])",
syscall, func, arg1, arg2, arg3, sc.result,
cb_target_str_errno (cb, sc.errcode), sc.errcode);
else
TRACE_SYSCALL (cpu, "%s[%i](%#lx, %#lx, %#lx) = %li",
syscall, func, arg1, arg2, arg3, sc.result);
/* Handle syscalls that affect engine behavior. */
switch (cb_target_to_host_syscall (cb, func))
{
case CB_SYS_exit:
sim_engine_halt (sd, cpu, NULL, sim_pc_get (cpu), sim_exited, arg1);
break;
case CB_SYS_kill:
/* TODO: Need to translate target signal to sim signal, but the sim
doesn't yet have such a mapping layer. */
if (arg1 == (*cb->getpid) (cb))
sim_engine_halt (sd, cpu, NULL, sim_pc_get (cpu), sim_signalled, arg2);
break;
}
*result = sc.result;
*result2 = sc.result2;
*errcode = sc.errcode;
}
long
sim_syscall (SIM_CPU *cpu, int func, long arg1, long arg2, long arg3, long arg4)
{
long result, result2;
int errcode;
sim_syscall_multi (cpu, func, arg1, arg2, arg3, arg4, &result, &result2,
&errcode);
if (result == -1)
return -errcode;
else
return result;
}
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