1 /* $NetBSD: linux_syscall.c,v 1.20 2008/02/06 22:12:39 dsl Exp $ */ 2 3 /*- 4 * Copyright (c) 2000, 2003 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 <sys/param.h> 78 79 __KERNEL_RCSID(0, "$NetBSD: linux_syscall.c,v 1.20 2008/02/06 22:12:39 dsl Exp $"); 80 81 #include <sys/device.h> 82 #include <sys/errno.h> 83 #include <sys/kernel.h> 84 #include <sys/reboot.h> 85 #include <sys/signalvar.h> 86 #include <sys/systm.h> 87 #include <sys/user.h> 88 89 #include <uvm/uvm_extern.h> 90 91 #include <machine/cpu.h> 92 #include <machine/frame.h> 93 #include <machine/pcb.h> 94 #include <arm/swi.h> 95 96 #include <compat/linux/common/linux_errno.h> 97 #include <compat/linux/linux_syscall.h> 98 99 /* ARMLinux has some system calls of its very own. */ 100 #define LINUX_ARM_NR_BASE 0x9f0000 101 #define LINUX_SYS_ARMBASE 0x000180 /* Must agree with syscalls.master */ 102 103 void linux_syscall_intern(struct proc *); 104 void linux_syscall_plain(struct trapframe *, struct lwp *, u_int32_t); 105 void linux_syscall_fancy(struct trapframe *, struct lwp *, u_int32_t); 106 107 void 108 linux_syscall_intern(struct proc *p) 109 { 110 111 if (trace_is_enabled(p)) 112 p->p_md.md_syscall = linux_syscall_fancy; 113 else 114 p->p_md.md_syscall = linux_syscall_plain; 115 } 116 117 void 118 linux_syscall_plain(trapframe_t *frame, struct lwp *l, u_int32_t insn) 119 { 120 const struct sysent *callp; 121 struct proc *p = l->l_proc; 122 int code, error; 123 register_t *args, rval[2]; 124 125 code = insn & 0x00ffffff; 126 /* Remap ARM-specific syscalls onto the end of the standard range. */ 127 if (code > LINUX_ARM_NR_BASE) 128 code = code - LINUX_ARM_NR_BASE + LINUX_SYS_ARMBASE; 129 code &= LINUX_SYS_NSYSENT - 1; 130 131 /* Linux passes all arguments in order in registers, which is nice. */ 132 args = &frame->tf_r0; 133 callp = p->p_emul->e_sysent + code; 134 135 rval[0] = 0; 136 rval[1] = 0; 137 error = (*callp->sy_call)(l, args, rval); 138 139 switch (error) { 140 case 0: 141 frame->tf_r0 = rval[0]; 142 break; 143 144 case ERESTART: 145 /* Reconstruct the pc to point at the swi. */ 146 frame->tf_pc -= INSN_SIZE; 147 break; 148 149 case EJUSTRETURN: 150 /* nothing to do */ 151 break; 152 153 default: 154 error = native_to_linux_errno[error]; 155 frame->tf_r0 = error; 156 break; 157 } 158 159 userret(l); 160 } 161 162 void 163 linux_syscall_fancy(trapframe_t *frame, struct lwp *l, u_int32_t insn) 164 { 165 const struct sysent *callp; 166 struct proc *p = l->l_proc; 167 int code, error; 168 register_t *args, rval[2]; 169 170 code = insn & 0x00ffffff; 171 /* Remap ARM-specific syscalls onto the end of the standard range. */ 172 if (code > LINUX_ARM_NR_BASE) 173 code = code - LINUX_ARM_NR_BASE + LINUX_SYS_ARMBASE; 174 code &= LINUX_SYS_NSYSENT - 1; 175 176 /* Linux passes all arguments in order in registers, which is nice. */ 177 args = &frame->tf_r0; 178 callp = p->p_emul->e_sysent + code; 179 180 if ((error = trace_enter(code, args, callp->sy_narg)) != 0) 181 goto out; 182 183 rval[0] = 0; 184 rval[1] = 0; 185 error = (*callp->sy_call)(l, args, rval); 186 out: 187 switch (error) { 188 case 0: 189 frame->tf_r0 = rval[0]; 190 break; 191 192 case ERESTART: 193 /* Reconstruct the pc to point at the swi. */ 194 frame->tf_pc -= INSN_SIZE; 195 break; 196 197 case EJUSTRETURN: 198 /* nothing to do */ 199 break; 200 201 default: 202 error = native_to_linux_errno[error]; 203 frame->tf_r0 = error; 204 break; 205 } 206 207 trace_exit(code, rval, error); 208 209 userret(l); 210 } 211