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7d5c6c43ca
Many ports have the same sim syscall logic, so add some helpers to handle all the common details. The arches still have to deal with the unpacking and packing of the syscall arguments, but the rest of the sim<->callback glue is now shared.
127 lines
3.5 KiB
C
127 lines
3.5 KiB
C
/* Simulator system call support.
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Copyright 2002-2015 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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#include "config.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 "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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char unknown_syscall[30];
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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 = (PTR) sd;
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sc.p2 = (PTR) 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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{
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sprintf (unknown_syscall, "syscall_%i", func);
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syscall = unknown_syscall;
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}
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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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if (cb_target_to_host_syscall (cb, func) == CB_SYS_exit)
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sim_engine_halt (sd, cpu, NULL, sim_pc_get (cpu), sim_exited, arg1);
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else if (sc.result == -1)
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{
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cb->last_errno = errno;
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sc.errcode = cb->get_errno (cb);
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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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