/* $NetBSD: linux_syscall.c,v 1.27 2015/03/07 18:52:46 christos Exp $ */ /*- * Copyright (c) 2000, 2003 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Charles M. Hannum. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /* * Copyright (c) 1994-1998 Mark Brinicombe. * Copyright (c) 1994 Brini. * All rights reserved. * * This code is derived from software written for Brini by Mark Brinicombe * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by Mark Brinicombe * for the NetBSD Project. * 4. The name of the company nor the name of the author may be used to * endorse or promote products derived from this software without specific * prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * ARMLinux emulation: syscall entry handling */ #include <sys/param.h> __KERNEL_RCSID(0, "$NetBSD: linux_syscall.c,v 1.27 2015/03/07 18:52:46 christos Exp $"); #include <sys/device.h> #include <sys/errno.h> #include <sys/kernel.h> #include <sys/reboot.h> #include <sys/signalvar.h> #include <sys/systm.h> #include <sys/syscallvar.h> #include <sys/cpu.h> #include <uvm/uvm_extern.h> #include <arm/swi.h> #include <arm/locore.h> #include <compat/linux/common/linux_errno.h> #include <compat/linux/linux_syscall.h> /* ARMLinux has some system calls of its very own. */ #define LINUX_ARM_NR_BASE 0x9f0000 #define LINUX_EARM_NR_BASE 0x0f0000 #define LINUX_SYS_ARMBASE 0x000180 /* Must agree with syscalls.master */ void linux_syscall_intern(struct proc *); void linux_syscall_plain(struct trapframe *, struct lwp *, uint32_t); void linux_syscall_fancy(struct trapframe *, struct lwp *, uint32_t); void linux_syscall_intern(struct proc *p) { if (trace_is_enabled(p)) p->p_md.md_syscall = linux_syscall_fancy; else p->p_md.md_syscall = linux_syscall_plain; } void linux_syscall_plain(trapframe_t *frame, struct lwp *l, uint32_t insn) { const struct sysent *callp; struct proc *p = l->l_proc; int code, error; register_t *args, rval[2]; code = insn & 0x00ffffff; if (code == 0) { /* EABI */ code = frame->tf_r7; if (code > LINUX_EARM_NR_BASE) code = code - LINUX_EARM_NR_BASE + LINUX_SYS_ARMBASE; } else { /* Remap ARM-specific syscalls onto the end of the standard range. */ if (code > LINUX_ARM_NR_BASE) code = code - LINUX_ARM_NR_BASE + LINUX_SYS_ARMBASE; } code &= LINUX_SYS_NSYSENT - 1; /* Linux passes all arguments in order in registers, which is nice. */ args = &frame->tf_r0; callp = p->p_emul->e_sysent + code; rval[0] = 0; rval[1] = 0; error = sy_call(callp, l, args, rval); switch (error) { case 0: frame->tf_r0 = rval[0]; break; case ERESTART: /* Reconstruct the pc to point at the swi. */ frame->tf_pc -= INSN_SIZE; break; case EJUSTRETURN: /* nothing to do */ break; default: error = native_to_linux_errno[error]; frame->tf_r0 = error; break; } userret(l); } void linux_syscall_fancy(trapframe_t *frame, struct lwp *l, uint32_t insn) { const struct sysent *callp; struct proc *p = l->l_proc; int code, error; register_t *args, rval[2]; code = insn & 0x00ffffff; if (code == 0) { /* EABI */ code = frame->tf_r7; if (code > LINUX_EARM_NR_BASE) code = code - LINUX_EARM_NR_BASE + LINUX_SYS_ARMBASE; } else { /* Remap ARM-specific syscalls onto the end of the standard range. */ if (code > LINUX_ARM_NR_BASE) code = code - LINUX_ARM_NR_BASE + LINUX_SYS_ARMBASE; } code &= LINUX_SYS_NSYSENT - 1; /* Linux passes all arguments in order in registers, which is nice. */ args = &frame->tf_r0; callp = p->p_emul->e_sysent + code; if ((error = trace_enter(code, callp, args)) != 0) goto out; rval[0] = 0; rval[1] = 0; error = sy_call(callp, l, args, rval); out: switch (error) { case 0: frame->tf_r0 = rval[0]; break; case ERESTART: /* Reconstruct the pc to point at the swi. */ frame->tf_pc -= INSN_SIZE; break; case EJUSTRETURN: /* nothing to do */ break; default: error = native_to_linux_errno[error]; frame->tf_r0 = error; break; } trace_exit(code, callp, args, rval, error); userret(l); }
