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/* Simulator system call support.
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Copyright 2002-2022 Free Software Foundation, Inc.
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This file is part of simulators.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* This must come before any other includes. */
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#include "defs.h"
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#include <errno.h>
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#include "ansidecl.h"
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#include "sim-main.h"
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#include "sim-syscall.h"
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#include "sim/callback.h"
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/* Read/write functions for system call interface. */
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int
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sim_syscall_read_mem (host_callback *cb ATTRIBUTE_UNUSED, struct cb_syscall *sc,
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unsigned long taddr, char *buf, int bytes)
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{
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SIM_DESC sd = (SIM_DESC) sc->p1;
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SIM_CPU *cpu = (SIM_CPU *) sc->p2;
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TRACE_MEMORY (cpu, "READ (syscall) %i bytes @ 0x%08lx", bytes, taddr);
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return sim_core_read_buffer (sd, cpu, read_map, buf, taddr, bytes);
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}
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int
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sim_syscall_write_mem (host_callback *cb ATTRIBUTE_UNUSED, struct cb_syscall *sc,
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unsigned long taddr, const char *buf, int bytes)
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{
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SIM_DESC sd = (SIM_DESC) sc->p1;
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SIM_CPU *cpu = (SIM_CPU *) sc->p2;
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TRACE_MEMORY (cpu, "WRITE (syscall) %i bytes @ 0x%08lx", bytes, taddr);
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return sim_core_write_buffer (sd, cpu, write_map, buf, taddr, bytes);
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}
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/* Main syscall callback for simulators. */
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void
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sim_syscall_multi (SIM_CPU *cpu, int func, long arg1, long arg2, long arg3,
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long arg4, long *result, long *result2, int *errcode)
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{
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SIM_DESC sd = CPU_STATE (cpu);
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host_callback *cb = STATE_CALLBACK (sd);
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CB_SYSCALL sc;
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const char unknown_syscall[] = "<UNKNOWN SYSCALL>";
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const char *syscall;
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CB_SYSCALL_INIT (&sc);
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sc.func = func;
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sc.arg1 = arg1;
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sc.arg2 = arg2;
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sc.arg3 = arg3;
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sc.arg4 = arg4;
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sc.p1 = sd;
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sc.p2 = cpu;
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sc.read_mem = sim_syscall_read_mem;
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sc.write_mem = sim_syscall_write_mem;
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if (cb_syscall (cb, &sc) != CB_RC_OK)
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{
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/* The cb_syscall func never returns an error, so this is more of a
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sanity check. */
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sim_engine_abort (sd, cpu, sim_pc_get (cpu), "cb_syscall failed");
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}
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syscall = cb_target_str_syscall (cb, func);
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if (!syscall)
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syscall = unknown_syscall;
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if (sc.result == -1)
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TRACE_SYSCALL (cpu, "%s[%i](%#lx, %#lx, %#lx) = %li (error = %s[%i])",
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syscall, func, arg1, arg2, arg3, sc.result,
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cb_target_str_errno (cb, sc.errcode), sc.errcode);
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else
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TRACE_SYSCALL (cpu, "%s[%i](%#lx, %#lx, %#lx) = %li",
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syscall, func, arg1, arg2, arg3, sc.result);
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/* Handle syscalls that affect engine behavior. */
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switch (cb_target_to_host_syscall (cb, func))
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{
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case CB_SYS_exit:
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sim_engine_halt (sd, cpu, NULL, sim_pc_get (cpu), sim_exited, arg1);
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break;
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case CB_SYS_kill:
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/* TODO: Need to translate target signal to sim signal, but the sim
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doesn't yet have such a mapping layer. */
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if (arg1 == (*cb->getpid) (cb))
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sim_engine_halt (sd, cpu, NULL, sim_pc_get (cpu), sim_signalled, arg2);
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break;
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}
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*result = sc.result;
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*result2 = sc.result2;
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*errcode = sc.errcode;
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}
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long
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sim_syscall (SIM_CPU *cpu, int func, long arg1, long arg2, long arg3, long arg4)
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{
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long result, result2;
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int errcode;
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sim_syscall_multi (cpu, func, arg1, arg2, arg3, arg4, &result, &result2,
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&errcode);
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if (result == -1)
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return -errcode;
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else
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return result;
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}
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