ia32_syscall.c revision 208453
1/*- 2 * Copyright (C) 1994, David Greenman 3 * Copyright (c) 1990, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * the University of Utah, and William Jolitz. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 */ 37 38#include <sys/cdefs.h> 39__FBSDID("$FreeBSD: head/sys/amd64/ia32/ia32_syscall.c 208453 2010-05-23 18:32:02Z kib $"); 40 41/* 42 * 386 Trap and System call handling 43 */ 44 45#include "opt_clock.h" 46#include "opt_cpu.h" 47#include "opt_isa.h" 48#include "opt_ktrace.h" 49 50#include <sys/param.h> 51#include <sys/bus.h> 52#include <sys/systm.h> 53#include <sys/proc.h> 54#include <sys/pioctl.h> 55#include <sys/kernel.h> 56#include <sys/ktr.h> 57#include <sys/lock.h> 58#include <sys/mutex.h> 59#include <sys/proc.h> 60#include <sys/ptrace.h> 61#include <sys/resourcevar.h> 62#include <sys/signalvar.h> 63#include <sys/syscall.h> 64#include <sys/sysctl.h> 65#include <sys/sysent.h> 66#include <sys/uio.h> 67#include <sys/vmmeter.h> 68#ifdef KTRACE 69#include <sys/ktrace.h> 70#endif 71#include <security/audit/audit.h> 72 73#include <vm/vm.h> 74#include <vm/vm_param.h> 75#include <vm/pmap.h> 76#include <vm/vm_kern.h> 77#include <vm/vm_map.h> 78#include <vm/vm_page.h> 79#include <vm/vm_extern.h> 80 81#include <machine/cpu.h> 82#include <machine/intr_machdep.h> 83#include <machine/md_var.h> 84 85#include <compat/freebsd32/freebsd32_util.h> 86 87#define IDTVEC(name) __CONCAT(X,name) 88 89extern inthand_t IDTVEC(int0x80_syscall), IDTVEC(rsvd); 90 91void ia32_syscall(struct trapframe *frame); /* Called from asm code */ 92 93void 94ia32_set_syscall_retval(struct thread *td, int error) 95{ 96 97 cpu_set_syscall_retval(td, error); 98} 99 100int 101ia32_fetch_syscall_args(struct thread *td, struct syscall_args *sa) 102{ 103 struct proc *p; 104 struct trapframe *frame; 105 caddr_t params; 106 u_int32_t args[8]; 107 int error, i; 108 109 p = td->td_proc; 110 frame = td->td_frame; 111 112 params = (caddr_t)frame->tf_rsp + sizeof(u_int32_t); 113 sa->code = frame->tf_rax; 114 115 /* 116 * Need to check if this is a 32 bit or 64 bit syscall. 117 */ 118 if (sa->code == SYS_syscall) { 119 /* 120 * Code is first argument, followed by actual args. 121 */ 122 sa->code = fuword32(params); 123 params += sizeof(int); 124 } else if (sa->code == SYS___syscall) { 125 /* 126 * Like syscall, but code is a quad, so as to maintain 127 * quad alignment for the rest of the arguments. 128 * We use a 32-bit fetch in case params is not 129 * aligned. 130 */ 131 sa->code = fuword32(params); 132 params += sizeof(quad_t); 133 } 134 if (p->p_sysent->sv_mask) 135 sa->code &= p->p_sysent->sv_mask; 136 if (sa->code >= p->p_sysent->sv_size) 137 sa->callp = &p->p_sysent->sv_table[0]; 138 else 139 sa->callp = &p->p_sysent->sv_table[sa->code]; 140 sa->narg = sa->callp->sy_narg; 141 142 if (params != NULL && sa->narg != 0) 143 error = copyin(params, (caddr_t)args, 144 (u_int)(sa->narg * sizeof(int))); 145 else 146 error = 0; 147 148 for (i = 0; i < sa->narg; i++) 149 sa->args[i] = args[i]; 150 151 if (error == 0) { 152 td->td_retval[0] = 0; 153 td->td_retval[1] = frame->tf_rdx; 154 } 155 156 return (error); 157} 158 159void 160ia32_syscall(struct trapframe *frame) 161{ 162 struct thread *td; 163 struct syscall_args sa; 164 register_t orig_tf_rflags; 165 int error; 166 ksiginfo_t ksi; 167 168 orig_tf_rflags = frame->tf_rflags; 169 td = curthread; 170 td->td_frame = frame; 171 172 error = syscallenter(td, &sa); 173 174 /* 175 * Traced syscall. 176 */ 177 if (orig_tf_rflags & PSL_T) { 178 frame->tf_rflags &= ~PSL_T; 179 ksiginfo_init_trap(&ksi); 180 ksi.ksi_signo = SIGTRAP; 181 ksi.ksi_code = TRAP_TRACE; 182 ksi.ksi_addr = (void *)frame->tf_rip; 183 trapsignal(td, &ksi); 184 } 185 186 syscallret(td, error, &sa); 187} 188 189static void 190ia32_syscall_enable(void *dummy) 191{ 192 193 setidt(IDT_SYSCALL, &IDTVEC(int0x80_syscall), SDT_SYSIGT, SEL_UPL, 0); 194} 195 196static void 197ia32_syscall_disable(void *dummy) 198{ 199 200 setidt(IDT_SYSCALL, &IDTVEC(rsvd), SDT_SYSIGT, SEL_KPL, 0); 201} 202 203SYSINIT(ia32_syscall, SI_SUB_EXEC, SI_ORDER_ANY, ia32_syscall_enable, NULL); 204SYSUNINIT(ia32_syscall, SI_SUB_EXEC, SI_ORDER_ANY, ia32_syscall_disable, NULL); 205