1 /* $NetBSD: linux_syscall.c,v 1.23 2009/11/21 20:32:17 rmind 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 1.23 2009/11/21 20:32:17 rmind 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/syscallvar.h> 81 82 #include <uvm/uvm_extern.h> 83 84 #include <machine/cpu.h> 85 #include <machine/frame.h> 86 #include <machine/pcb.h> 87 #include <arm/swi.h> 88 89 #include <compat/linux/common/linux_errno.h> 90 #include <compat/linux/linux_syscall.h> 91 92 /* ARMLinux has some system calls of its very own. */ 93 #define LINUX_ARM_NR_BASE 0x9f0000 94 #define LINUX_SYS_ARMBASE 0x000180 /* Must agree with syscalls.master */ 95 96 void linux_syscall_intern(struct proc *); 97 void linux_syscall_plain(struct trapframe *, struct lwp *, u_int32_t); 98 void linux_syscall_fancy(struct trapframe *, struct lwp *, u_int32_t); 99 100 void 101 linux_syscall_intern(struct proc *p) 102 { 103 104 if (trace_is_enabled(p)) 105 p->p_md.md_syscall = linux_syscall_fancy; 106 else 107 p->p_md.md_syscall = linux_syscall_plain; 108 } 109 110 void 111 linux_syscall_plain(trapframe_t *frame, struct lwp *l, u_int32_t insn) 112 { 113 const struct sysent *callp; 114 struct proc *p = l->l_proc; 115 int code, error; 116 register_t *args, rval[2]; 117 118 code = insn & 0x00ffffff; 119 /* Remap ARM-specific syscalls onto the end of the standard range. */ 120 if (code > LINUX_ARM_NR_BASE) 121 code = code - LINUX_ARM_NR_BASE + LINUX_SYS_ARMBASE; 122 code &= LINUX_SYS_NSYSENT - 1; 123 124 /* Linux passes all arguments in order in registers, which is nice. */ 125 args = &frame->tf_r0; 126 callp = p->p_emul->e_sysent + code; 127 128 rval[0] = 0; 129 rval[1] = 0; 130 error = sy_call(callp, l, args, rval); 131 132 switch (error) { 133 case 0: 134 frame->tf_r0 = rval[0]; 135 break; 136 137 case ERESTART: 138 /* Reconstruct the pc to point at the swi. */ 139 frame->tf_pc -= INSN_SIZE; 140 break; 141 142 case EJUSTRETURN: 143 /* nothing to do */ 144 break; 145 146 default: 147 error = native_to_linux_errno[error]; 148 frame->tf_r0 = error; 149 break; 150 } 151 152 userret(l); 153 } 154 155 void 156 linux_syscall_fancy(trapframe_t *frame, struct lwp *l, u_int32_t insn) 157 { 158 const struct sysent *callp; 159 struct proc *p = l->l_proc; 160 int code, error; 161 register_t *args, rval[2]; 162 163 code = insn & 0x00ffffff; 164 /* Remap ARM-specific syscalls onto the end of the standard range. */ 165 if (code > LINUX_ARM_NR_BASE) 166 code = code - LINUX_ARM_NR_BASE + LINUX_SYS_ARMBASE; 167 code &= LINUX_SYS_NSYSENT - 1; 168 169 /* Linux passes all arguments in order in registers, which is nice. */ 170 args = &frame->tf_r0; 171 callp = p->p_emul->e_sysent + code; 172 173 if ((error = trace_enter(code, args, callp->sy_narg)) != 0) 174 goto out; 175 176 rval[0] = 0; 177 rval[1] = 0; 178 error = sy_call(callp, l, args, rval); 179 out: 180 switch (error) { 181 case 0: 182 frame->tf_r0 = rval[0]; 183 break; 184 185 case ERESTART: 186 /* Reconstruct the pc to point at the swi. */ 187 frame->tf_pc -= INSN_SIZE; 188 break; 189 190 case EJUSTRETURN: 191 /* nothing to do */ 192 break; 193 194 default: 195 error = native_to_linux_errno[error]; 196 frame->tf_r0 = error; 197 break; 198 } 199 200 trace_exit(code, rval, error); 201 202 userret(l); 203 } 204