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2f631626f1
If code tries to send a signal to itself, the callback layer ignores it and forces the caller to handle it. This allows the sim to turn that into an engine halt rather than actually killing the sim.
133 lines
3.7 KiB
C
133 lines
3.7 KiB
C
/* Simulator system call support.
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Copyright 2002-2021 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 "sim-main.h"
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#include "sim-syscall.h"
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#include "sim/callback.h"
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#include "targ-vals.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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