1 /* $NetBSD: netbsd32_syscall.c,v 1.31 2010/12/20 00:25:24 matt 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 * 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 #include <sys/cdefs.h> 33 __KERNEL_RCSID(0, "$NetBSD: netbsd32_syscall.c,v 1.31 2010/12/20 00:25:24 matt Exp $"); 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/proc.h> 38 #include <sys/signal.h> 39 /* XXX this file ought to include the netbsd32 version of these 2 headers */ 40 #include <sys/syscall.h> 41 #include <sys/syscallvar.h> 42 #include <sys/syscallargs.h> 43 #include <sys/syscall_stats.h> 44 45 #include <machine/cpu.h> 46 #include <machine/psl.h> 47 #include <machine/userret.h> 48 49 void netbsd32_syscall_intern(struct proc *); 50 static void netbsd32_syscall(struct trapframe *); 51 52 void 53 netbsd32_syscall_intern(struct proc *p) 54 { 55 56 p->p_md.md_syscall = netbsd32_syscall; 57 } 58 59 void 60 netbsd32_syscall(struct trapframe *frame) 61 { 62 char *params; 63 const struct sysent *callp; 64 struct proc *p; 65 struct lwp *l; 66 int error; 67 int i; 68 register32_t code, args[2 + SYS_MAXSYSARGS]; 69 register_t rval[2]; 70 register_t args64[SYS_MAXSYSARGS]; 71 72 l = curlwp; 73 p = l->l_proc; 74 75 code = frame->tf_rax & (SYS_NSYSENT - 1); 76 callp = p->p_emul->e_sysent + code; 77 78 LWP_CACHE_CREDS(l, p); 79 80 SYSCALL_COUNT(syscall_counts, code); 81 SYSCALL_TIME_SYS_ENTRY(l, syscall_times, code); 82 83 params = (char *)frame->tf_rsp + sizeof(int); 84 85 if (callp->sy_argsize) { 86 error = copyin(params, args, callp->sy_argsize); 87 if (__predict_false(error != 0)) 88 goto bad; 89 /* Recover 'code' - not in a register */ 90 code = frame->tf_rax & (SYS_NSYSENT - 1); 91 } 92 93 if (__predict_false(p->p_trace_enabled) 94 && !__predict_false(callp->sy_flags & SYCALL_INDIRECT)) { 95 int narg = callp->sy_argsize >> 2; 96 for (i = 0; i < narg; i++) 97 args64[i] = args[i]; 98 error = trace_enter(code, args64, narg); 99 if (__predict_false(error != 0)) 100 goto out; 101 } 102 103 rval[0] = 0; 104 rval[1] = 0; 105 error = sy_call(callp, l, args, rval); 106 107 out: 108 if (__predict_false(p->p_trace_enabled) 109 && !__predict_false(callp->sy_flags & SYCALL_INDIRECT)) { 110 /* Recover 'code' - the compiler doesn't assign it a register */ 111 code = frame->tf_rax & (SYS_NSYSENT - 1); 112 trace_exit(code, rval, error); 113 } 114 115 if (__predict_true(error == 0)) { 116 frame->tf_rax = rval[0]; 117 frame->tf_rdx = rval[1]; 118 frame->tf_rflags &= ~PSL_C; /* carry bit */ 119 } else { 120 switch (error) { 121 case ERESTART: 122 /* 123 * The offset to adjust the PC by depends on whether we 124 * entered the kernel through the trap or call gate. 125 * We saved the instruction size in tf_err on entry. 126 */ 127 frame->tf_rip -= frame->tf_err; 128 break; 129 case EJUSTRETURN: 130 /* nothing to do */ 131 break; 132 default: 133 bad: 134 frame->tf_rax = error; 135 frame->tf_rflags |= PSL_C; /* carry bit */ 136 break; 137 } 138 } 139 140 SYSCALL_TIME_SYS_EXIT(l); 141 userret(l); 142 } 143