1 /* $NetBSD: linux_syscall.c,v 1.11 2004/08/01 14:19:00 jdolecek 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 "opt_ktrace.h" 78 #include "opt_systrace.h" 79 #include "opt_syscall_debug.h" 80 81 #include <sys/param.h> 82 83 __KERNEL_RCSID(0, "$NetBSD: linux_syscall.c,v 1.11 2004/08/01 14:19:00 jdolecek Exp $"); 84 85 #include <sys/device.h> 86 #include <sys/errno.h> 87 #include <sys/kernel.h> 88 #include <sys/reboot.h> 89 #include <sys/signalvar.h> 90 #include <sys/systm.h> 91 #include <sys/user.h> 92 #ifdef KTRACE 93 #include <sys/ktrace.h> 94 #endif 95 #ifdef SYSTRACE 96 #include <sys/systrace.h> 97 #endif 98 99 #include <uvm/uvm_extern.h> 100 101 #include <machine/cpu.h> 102 #include <machine/frame.h> 103 #include <machine/pcb.h> 104 #include <arm/swi.h> 105 106 #include <compat/linux/common/linux_errno.h> 107 #include <compat/linux/linux_syscall.h> 108 109 /* ARMLinux has some system calls of its very own. */ 110 #define LINUX_ARM_NR_BASE 0x9f0000 111 #define LINUX_SYS_ARMBASE 0x000180 /* Must agree with syscalls.master */ 112 113 void linux_syscall_intern(struct proc *); 114 void linux_syscall_plain(struct trapframe *, struct lwp *, u_int32_t); 115 void linux_syscall_fancy(struct trapframe *, struct lwp *, u_int32_t); 116 117 void 118 linux_syscall_intern(struct proc *p) 119 { 120 #ifdef KTRACE 121 if (p->p_traceflag & (KTRFAC_SYSCALL | KTRFAC_SYSRET)) { 122 p->p_md.md_syscall = linux_syscall_fancy; 123 return; 124 } 125 #endif 126 #ifdef SYSTRACE 127 if (p->p_flag & P_SYSTRACE) { 128 p->p_md.md_syscall = linux_syscall_fancy; 129 return; 130 } 131 #endif 132 p->p_md.md_syscall = linux_syscall_plain; 133 } 134 135 void 136 linux_syscall_plain(trapframe_t *frame, struct lwp *l, u_int32_t insn) 137 { 138 const struct sysent *callp; 139 struct proc *p = l->l_proc; 140 int code, error; 141 u_int nargs; 142 register_t *args, rval[2]; 143 144 code = insn & 0x00ffffff; 145 /* Remap ARM-specific syscalls onto the end of the standard range. */ 146 if (code > LINUX_ARM_NR_BASE) 147 code = code - LINUX_ARM_NR_BASE + LINUX_SYS_ARMBASE; 148 code &= LINUX_SYS_NSYSENT - 1; 149 150 /* Linux passes all arguments in order in registers, which is nice. */ 151 args = &frame->tf_r0; 152 callp = p->p_emul->e_sysent + code; 153 nargs = callp->sy_argsize / sizeof(register_t); 154 155 rval[0] = 0; 156 rval[1] = 0; 157 error = (*callp->sy_call)(l, args, rval); 158 159 switch (error) { 160 case 0: 161 frame->tf_r0 = rval[0]; 162 break; 163 164 case ERESTART: 165 /* Reconstruct the pc to point at the swi. */ 166 frame->tf_pc -= INSN_SIZE; 167 break; 168 169 case EJUSTRETURN: 170 /* nothing to do */ 171 break; 172 173 default: 174 error = native_to_linux_errno[error]; 175 frame->tf_r0 = error; 176 break; 177 } 178 179 userret(l); 180 } 181 182 void 183 linux_syscall_fancy(trapframe_t *frame, struct lwp *l, u_int32_t insn) 184 { 185 const struct sysent *callp; 186 struct proc *p = l->l_proc; 187 int code, error; 188 u_int nargs; 189 register_t *args, rval[2]; 190 191 code = insn & 0x00ffffff; 192 /* Remap ARM-specific syscalls onto the end of the standard range. */ 193 if (code > LINUX_ARM_NR_BASE) 194 code = code - LINUX_ARM_NR_BASE + LINUX_SYS_ARMBASE; 195 code &= LINUX_SYS_NSYSENT - 1; 196 197 /* Linux passes all arguments in order in registers, which is nice. */ 198 args = &frame->tf_r0; 199 callp = p->p_emul->e_sysent + code; 200 nargs = callp->sy_argsize / sizeof(register_t); 201 202 if ((error = trace_enter(l, code, code, NULL, args)) != 0) 203 goto bad; 204 205 rval[0] = 0; 206 rval[1] = 0; 207 error = (*callp->sy_call)(l, args, rval); 208 209 switch (error) { 210 case 0: 211 frame->tf_r0 = rval[0]; 212 break; 213 214 case ERESTART: 215 /* Reconstruct the pc to point at the swi. */ 216 frame->tf_pc -= INSN_SIZE; 217 break; 218 219 case EJUSTRETURN: 220 /* nothing to do */ 221 break; 222 223 default: 224 bad: 225 error = native_to_linux_errno[error]; 226 frame->tf_r0 = error; 227 break; 228 } 229 230 trace_exit(l, code, args, rval, error); 231 232 userret(l); 233 } 234