1 /* $NetBSD: linux_syscall.c,v 1.22 2008/10/21 12:16:59 ad 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright (c) 1994-1998 Mark Brinicombe. 34 * Copyright (c) 1994 Brini. 35 * All rights reserved. 36 * 37 * This code is derived from software written for Brini by Mark Brinicombe 38 * 39 * Redistribution and use in source and binary forms, with or without 40 * modification, are permitted provided that the following conditions 41 * are met: 42 * 1. Redistributions of source code must retain the above copyright 43 * notice, this list of conditions and the following disclaimer. 44 * 2. Redistributions in binary form must reproduce the above copyright 45 * notice, this list of conditions and the following disclaimer in the 46 * documentation and/or other materials provided with the distribution. 47 * 3. All advertising materials mentioning features or use of this software 48 * must display the following acknowledgement: 49 * This product includes software developed by Mark Brinicombe 50 * for the NetBSD Project. 51 * 4. The name of the company nor the name of the author may be used to 52 * endorse or promote products derived from this software without specific 53 * prior written permission. 54 * 55 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 56 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 57 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 58 * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 59 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 60 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 61 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 62 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 63 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 64 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 65 * SUCH DAMAGE. 66 * 67 * ARMLinux emulation: syscall entry handling 68 */ 69 70 #include <sys/param.h> 71 72 __KERNEL_RCSID(0, "$NetBSD: linux_syscall.c,v 1.22 2008/10/21 12:16:59 ad Exp $"); 73 74 #include <sys/device.h> 75 #include <sys/errno.h> 76 #include <sys/kernel.h> 77 #include <sys/reboot.h> 78 #include <sys/signalvar.h> 79 #include <sys/systm.h> 80 #include <sys/user.h> 81 #include <sys/syscallvar.h> 82 83 #include <uvm/uvm_extern.h> 84 85 #include <machine/cpu.h> 86 #include <machine/frame.h> 87 #include <machine/pcb.h> 88 #include <arm/swi.h> 89 90 #include <compat/linux/common/linux_errno.h> 91 #include <compat/linux/linux_syscall.h> 92 93 /* ARMLinux has some system calls of its very own. */ 94 #define LINUX_ARM_NR_BASE 0x9f0000 95 #define LINUX_SYS_ARMBASE 0x000180 /* Must agree with syscalls.master */ 96 97 void linux_syscall_intern(struct proc *); 98 void linux_syscall_plain(struct trapframe *, struct lwp *, u_int32_t); 99 void linux_syscall_fancy(struct trapframe *, struct lwp *, u_int32_t); 100 101 void 102 linux_syscall_intern(struct proc *p) 103 { 104 105 if (trace_is_enabled(p)) 106 p->p_md.md_syscall = linux_syscall_fancy; 107 else 108 p->p_md.md_syscall = linux_syscall_plain; 109 } 110 111 void 112 linux_syscall_plain(trapframe_t *frame, struct lwp *l, u_int32_t insn) 113 { 114 const struct sysent *callp; 115 struct proc *p = l->l_proc; 116 int code, error; 117 register_t *args, rval[2]; 118 119 code = insn & 0x00ffffff; 120 /* Remap ARM-specific syscalls onto the end of the standard range. */ 121 if (code > LINUX_ARM_NR_BASE) 122 code = code - LINUX_ARM_NR_BASE + LINUX_SYS_ARMBASE; 123 code &= LINUX_SYS_NSYSENT - 1; 124 125 /* Linux passes all arguments in order in registers, which is nice. */ 126 args = &frame->tf_r0; 127 callp = p->p_emul->e_sysent + code; 128 129 rval[0] = 0; 130 rval[1] = 0; 131 error = sy_call(callp, l, args, rval); 132 133 switch (error) { 134 case 0: 135 frame->tf_r0 = rval[0]; 136 break; 137 138 case ERESTART: 139 /* Reconstruct the pc to point at the swi. */ 140 frame->tf_pc -= INSN_SIZE; 141 break; 142 143 case EJUSTRETURN: 144 /* nothing to do */ 145 break; 146 147 default: 148 error = native_to_linux_errno[error]; 149 frame->tf_r0 = error; 150 break; 151 } 152 153 userret(l); 154 } 155 156 void 157 linux_syscall_fancy(trapframe_t *frame, struct lwp *l, u_int32_t insn) 158 { 159 const struct sysent *callp; 160 struct proc *p = l->l_proc; 161 int code, error; 162 register_t *args, rval[2]; 163 164 code = insn & 0x00ffffff; 165 /* Remap ARM-specific syscalls onto the end of the standard range. */ 166 if (code > LINUX_ARM_NR_BASE) 167 code = code - LINUX_ARM_NR_BASE + LINUX_SYS_ARMBASE; 168 code &= LINUX_SYS_NSYSENT - 1; 169 170 /* Linux passes all arguments in order in registers, which is nice. */ 171 args = &frame->tf_r0; 172 callp = p->p_emul->e_sysent + code; 173 174 if ((error = trace_enter(code, args, callp->sy_narg)) != 0) 175 goto out; 176 177 rval[0] = 0; 178 rval[1] = 0; 179 error = sy_call(callp, l, args, rval); 180 out: 181 switch (error) { 182 case 0: 183 frame->tf_r0 = rval[0]; 184 break; 185 186 case ERESTART: 187 /* Reconstruct the pc to point at the swi. */ 188 frame->tf_pc -= INSN_SIZE; 189 break; 190 191 case EJUSTRETURN: 192 /* nothing to do */ 193 break; 194 195 default: 196 error = native_to_linux_errno[error]; 197 frame->tf_r0 = error; 198 break; 199 } 200 201 trace_exit(code, rval, error); 202 203 userret(l); 204 } 205