1 /* $NetBSD: linux_syscall.c,v 1.24 2015/03/07 18:54:57 christos Exp $ */ 2 3 /*- 4 * Portions Copyright (c) 2000 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /* 30 * Copyright (c) 1988 University of Utah. 31 * Copyright (c) 1982, 1986, 1990, 1993 32 * The Regents of the University of California. All rights reserved. 33 * 34 * This code is derived from software contributed to Berkeley by 35 * the Systems Programming Group of the University of Utah Computer 36 * Science Department. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 46 * 3. Neither the name of the University nor the names of its contributors 47 * may be used to endorse or promote products derived from this software 48 * without specific prior written permission. 49 * 50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 60 * SUCH DAMAGE. 61 * 62 * from: Utah $Hdr: trap.c 1.37 92/12/20$ 63 * 64 * @(#)trap.c 8.5 (Berkeley) 1/4/94 65 */ 66 67 #include <sys/cdefs.h> 68 __KERNEL_RCSID(0, "$NetBSD: linux_syscall.c,v 1.24 2015/03/07 18:54:57 christos Exp $"); 69 70 #ifdef _KERNEL_OPT 71 #include "opt_execfmt.h" 72 #endif 73 74 #include <sys/param.h> 75 #include <sys/systm.h> 76 #include <sys/proc.h> 77 #include <sys/acct.h> 78 #include <sys/kernel.h> 79 #include <sys/syscall.h> 80 #include <sys/syscallvar.h> 81 #include <sys/syslog.h> 82 83 #include <machine/psl.h> 84 #include <machine/cpu.h> 85 #include <machine/reg.h> 86 87 #include <uvm/uvm_extern.h> 88 89 void linux_syscall_intern(struct proc *); 90 static void linux_syscall_plain(register_t, struct lwp *, struct frame *); 91 static void linux_syscall_fancy(register_t, struct lwp *, struct frame *); 92 93 void 94 linux_syscall_intern(struct proc *p) 95 { 96 97 if (trace_is_enabled(p)) 98 p->p_md.md_syscall = linux_syscall_fancy; 99 else 100 p->p_md.md_syscall = linux_syscall_plain; 101 } 102 103 static void 104 linux_syscall_plain(register_t code, struct lwp *l, struct frame *frame) 105 { 106 struct proc *p = l->l_proc; 107 const struct sysent *callp; 108 int error, nsys; 109 size_t argsize; 110 register_t args[8], rval[2]; 111 112 nsys = p->p_emul->e_nsysent; 113 callp = p->p_emul->e_sysent; 114 115 if (code < 0 || code >= nsys) 116 callp += p->p_emul->e_nosys; /* illegal */ 117 else 118 callp += code; 119 120 argsize = callp->sy_argsize; 121 122 /* 123 * Linux passes the args in d1-d5 124 */ 125 switch (argsize) { 126 case 20: 127 args[4] = frame->f_regs[D5]; 128 case 16: 129 args[3] = frame->f_regs[D4]; 130 case 12: 131 args[2] = frame->f_regs[D3]; 132 case 8: 133 args[1] = frame->f_regs[D2]; 134 case 4: 135 args[0] = frame->f_regs[D1]; 136 case 0: 137 break; 138 default: 139 panic("linux syscall %d weird argsize %d", 140 code, argsize); 141 break; 142 } 143 144 rval[0] = 0; 145 rval[1] = frame->f_regs[D1]; 146 error = sy_call(callp, l, args, rval); 147 148 switch (error) { 149 case 0: 150 /* 151 * Reinitialize proc pointer `p' as it may be different 152 * if this is a child returning from fork syscall. 153 */ 154 p = curproc; 155 frame->f_regs[D0] = rval[0]; 156 frame->f_regs[D1] = rval[1]; 157 frame->f_sr &= ~PSL_C; /* carry bit */ 158 break; 159 case ERESTART: 160 /* 161 * We always enter through a `trap' instruction, which is 2 162 * bytes, so adjust the pc by that amount. 163 */ 164 frame->f_pc = frame->f_pc - 2; 165 break; 166 case EJUSTRETURN: 167 /* nothing to do */ 168 break; 169 default: 170 if (p->p_emul->e_errno) 171 error = p->p_emul->e_errno[error]; 172 frame->f_regs[D0] = error; 173 frame->f_sr |= PSL_C; /* carry bit */ 174 break; 175 } 176 } 177 178 static void 179 linux_syscall_fancy(register_t code, struct lwp *l, struct frame *frame) 180 { 181 struct proc *p = l->l_proc; 182 const struct sysent *callp; 183 int error, nsys; 184 size_t argsize; 185 register_t args[8], rval[2]; 186 187 nsys = p->p_emul->e_nsysent; 188 callp = p->p_emul->e_sysent; 189 190 if (code < 0 || code >= nsys) 191 callp += p->p_emul->e_nosys; /* illegal */ 192 else 193 callp += code; 194 195 argsize = callp->sy_argsize; 196 197 /* 198 * Linux passes the args in d1-d5 199 */ 200 switch (argsize) { 201 case 20: 202 args[4] = frame->f_regs[D5]; 203 case 16: 204 args[3] = frame->f_regs[D4]; 205 case 12: 206 args[2] = frame->f_regs[D3]; 207 case 8: 208 args[1] = frame->f_regs[D2]; 209 case 4: 210 args[0] = frame->f_regs[D1]; 211 case 0: 212 break; 213 default: 214 panic("linux syscall %d weird argsize %d", 215 code, argsize); 216 break; 217 } 218 219 if ((error = trace_enter(code, callp, args)) != 0) 220 goto out; 221 222 rval[0] = 0; 223 rval[1] = frame->f_regs[D1]; 224 error = sy_call(callp, l, args, rval); 225 out: 226 switch (error) { 227 case 0: 228 /* 229 * Reinitialize proc pointer `p' as it may be different 230 * if this is a child returning from fork syscall. 231 */ 232 p = curproc; 233 frame->f_regs[D0] = rval[0]; 234 frame->f_regs[D1] = rval[1]; 235 frame->f_sr &= ~PSL_C; /* carry bit */ 236 break; 237 case ERESTART: 238 /* 239 * We always enter through a `trap' instruction, which is 2 240 * bytes, so adjust the pc by that amount. 241 */ 242 frame->f_pc = frame->f_pc - 2; 243 break; 244 case EJUSTRETURN: 245 /* nothing to do */ 246 break; 247 default: 248 if (p->p_emul->e_errno) 249 error = p->p_emul->e_errno[error]; 250 frame->f_regs[D0] = error; 251 frame->f_sr |= PSL_C; /* carry bit */ 252 break; 253 } 254 255 trace_exit(code, callp, args, rval, error); 256 } 257
Indexes created Mon Oct 26 00:26:21 UTC 2026