1 /* $NetBSD: linux_syscall.c,v 1.4 2002/03/10 15:47:43 bjh21 Exp $ */ 2 3 /*- 4 * Copyright (c) 2000 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Charles M. Hannum. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Copyright (c) 1994-1998 Mark Brinicombe. 41 * Copyright (c) 1994 Brini. 42 * All rights reserved. 43 * 44 * This code is derived from software written for Brini by Mark Brinicombe 45 * 46 * Redistribution and use in source and binary forms, with or without 47 * modification, are permitted provided that the following conditions 48 * are met: 49 * 1. Redistributions of source code must retain the above copyright 50 * notice, this list of conditions and the following disclaimer. 51 * 2. Redistributions in binary form must reproduce the above copyright 52 * notice, this list of conditions and the following disclaimer in the 53 * documentation and/or other materials provided with the distribution. 54 * 3. All advertising materials mentioning features or use of this software 55 * must display the following acknowledgement: 56 * This product includes software developed by Mark Brinicombe 57 * for the NetBSD Project. 58 * 4. The name of the company nor the name of the author may be used to 59 * endorse or promote products derived from this software without specific 60 * prior written permission. 61 * 62 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 63 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 64 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 65 * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 66 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 67 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 68 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 69 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 70 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 71 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 72 * SUCH DAMAGE. 73 * 74 * ARMLinux emulation: syscall entry handling 75 */ 76 77 #include "opt_ktrace.h" 78 #include "opt_syscall_debug.h" 79 80 #include <sys/param.h> 81 82 __KERNEL_RCSID(0, "$NetBSD: linux_syscall.c,v 1.4 2002/03/10 15:47:43 bjh21 Exp $"); 83 84 #include <sys/device.h> 85 #include <sys/errno.h> 86 #include <sys/kernel.h> 87 #include <sys/reboot.h> 88 #include <sys/signalvar.h> 89 #include <sys/systm.h> 90 #include <sys/user.h> 91 #ifdef KTRACE 92 #include <sys/ktrace.h> 93 #endif 94 95 #include <uvm/uvm_extern.h> 96 97 #include <machine/cpu.h> 98 #include <machine/frame.h> 99 #include <machine/pcb.h> 100 #include <arm/swi.h> 101 102 #include <compat/linux/common/linux_errno.h> 103 #include <compat/linux/linux_syscall.h> 104 105 /* ARMLinux has some system calls of its very own. */ 106 #define LINUX_ARM_NR_BASE 0x9f0000 107 #define LINUX_SYS_ARMBASE 0x000100 /* Must agree with syscalls.master */ 108 109 /* XXX */ 110 void linux_syscall(struct trapframe *frame, struct proc *p, u_int32_t insn); 111 112 void 113 linux_syscall(trapframe_t *frame, struct proc *p, u_int32_t insn) 114 { 115 const struct sysent *callp; 116 int code, error; 117 u_int nargs; 118 register_t *args, rval[2]; 119 120 code = insn & 0x00ffffff; 121 /* Remap ARM-specific syscalls onto the end of the standard range. */ 122 if (code > LINUX_ARM_NR_BASE) 123 code = code - LINUX_ARM_NR_BASE + LINUX_SYS_ARMBASE; 124 code &= LINUX_SYS_NSYSENT - 1; 125 126 /* Linux passes all arguments in order in registers, which is nice. */ 127 args = &frame->tf_r0; 128 callp = p->p_emul->e_sysent + code; 129 nargs = callp->sy_argsize / sizeof(register_t); 130 131 #ifdef SYSCALL_DEBUG 132 scdebug_call(p, code, args); 133 #endif 134 #ifdef KTRACE 135 if (KTRPOINT(p, KTR_SYSCALL)) 136 ktrsyscall(p, code, nargs * sizeof(register_t), args); 137 #endif 138 139 rval[0] = 0; 140 rval[1] = 0; 141 error = (*callp->sy_call)(p, args, rval); 142 143 switch (error) { 144 case 0: 145 frame->tf_r0 = rval[0]; 146 break; 147 148 case ERESTART: 149 /* Reconstruct the pc to point at the swi. */ 150 frame->tf_pc -= INSN_SIZE; 151 break; 152 153 case EJUSTRETURN: 154 /* nothing to do */ 155 break; 156 157 default: 158 error = native_to_linux_errno[error]; 159 frame->tf_r0 = error; 160 break; 161 } 162 163 #ifdef SYSCALL_DEBUG 164 scdebug_ret(p, code, error, rval); 165 #endif 166 userret(p); 167 #ifdef KTRACE 168 if (KTRPOINT(p, KTR_SYSRET)) 169 ktrsysret(p, code, error, rval[0]); 170 #endif 171 } 172