1 /* $NetBSD: linux_syscall.c,v 1.18 2007/11/03 12:58:04 dsl Exp $ */ 2 3 /*- 4 * Copyright (c) 1998, 2000 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 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: linux_syscall.c,v 1.18 2007/11/03 12:58:04 dsl Exp $"); 41 42 #if defined(_KERNEL_OPT) 43 #include "opt_compat_linux.h" 44 #endif 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/proc.h> 49 #include <sys/user.h> 50 #include <sys/signal.h> 51 #include <sys/syscall.h> 52 53 #include <uvm/uvm_extern.h> 54 55 #include <machine/cpu.h> 56 #include <machine/psl.h> 57 #include <machine/userret.h> 58 59 #include <compat/linux/linux_syscall.h> 60 #include <compat/linux/common/linux_types.h> 61 #include <compat/linux/common/linux_errno.h> 62 #include <compat/linux/common/linux_signal.h> 63 #include <compat/linux/common/linux_siginfo.h> 64 #include <compat/linux/arch/amd64/linux_siginfo.h> 65 #include <compat/linux/arch/amd64/linux_syscall.h> 66 #include <compat/linux/arch/amd64/linux_machdep.h> 67 68 void linux_syscall_intern(struct proc *); 69 static void linux_syscall(struct trapframe *); 70 71 void 72 linux_syscall_intern(struct proc *p) 73 { 74 75 p->p_trace_enabled = trace_is_enabled(p); 76 p->p_md.md_syscall = linux_syscall; 77 } 78 79 /* 80 * syscall(frame): 81 * System call request from POSIX system call gate interface to kernel. 82 * Like trap(), argument is call by reference. 83 */ 84 static void 85 linux_syscall(struct trapframe *frame) 86 { 87 const struct sysent *callp; 88 struct proc *p; 89 struct lwp *l; 90 int error; 91 register_t code, args[6], rval[2]; 92 93 l = curlwp; 94 p = l->l_proc; 95 96 code = frame->tf_rax; 97 uvmexp.syscalls++; 98 99 LWP_CACHE_CREDS(l, p); 100 101 callp = p->p_emul->e_sysent; 102 103 code &= (SYS_NSYSENT - 1); 104 callp += code; 105 106 /* Linux system calls have a maximum of 6 arguments, copy them all */ 107 args[0] = frame->tf_rdi; 108 args[1] = frame->tf_rsi; 109 args[2] = frame->tf_rdx; 110 args[3] = frame->tf_r10; 111 args[4] = frame->tf_r8; 112 args[5] = frame->tf_r9; 113 114 KERNEL_LOCK(1, l); 115 if (__predict_false(p->p_trace_enabled) 116 && (error = trace_enter(l, code, code, NULL, args)) != 0) 117 goto out; 118 119 rval[0] = 0; 120 rval[1] = 0; 121 error = (*callp->sy_call)(l, args, rval); 122 out: 123 KERNEL_UNLOCK_LAST(l); 124 switch (error) { 125 case 0: 126 frame->tf_rax = rval[0]; 127 frame->tf_rflags &= ~PSL_C; /* carry bit */ 128 break; 129 case ERESTART: 130 /* 131 * The offset to adjust the PC by depends on whether we entered 132 * the kernel through the trap or call gate. We pushed the 133 * size of the instruction into tf_err on entry. 134 */ 135 frame->tf_rip -= frame->tf_err; 136 break; 137 case EJUSTRETURN: 138 /* nothing to do */ 139 break; 140 default: 141 error = native_to_linux_errno[error]; 142 frame->tf_rax = error; 143 frame->tf_rflags |= PSL_C; /* carry bit */ 144 break; 145 } 146 147 if (__predict_false(p->p_trace_enabled)) 148 trace_exit(l, code, args, rval, error); 149 150 userret(l); 151 } 152