ia32_syscall.c revision 211515
132822Syokota/*- 232822Syokota * Copyright (C) 1994, David Greenman 332822Syokota * Copyright (c) 1990, 1993 432822Syokota * The Regents of the University of California. All rights reserved. 532822Syokota * 632822Syokota * This code is derived from software contributed to Berkeley by 732822Syokota * the University of Utah, and William Jolitz. 832822Syokota * 932822Syokota * Redistribution and use in source and binary forms, with or without 1037204Ssteve * modification, are permitted provided that the following conditions 1143334Syokota * are met: 1243334Syokota * 1. Redistributions of source code must retain the above copyright 1343334Syokota * notice, this list of conditions and the following disclaimer. 1443334Syokota * 2. Redistributions in binary form must reproduce the above copyright 1543334Syokota * notice, this list of conditions and the following disclaimer in the 1643334Syokota * documentation and/or other materials provided with the distribution. 1743334Syokota * 3. All advertising materials mentioning features or use of this software 1843334Syokota * must display the following acknowledgement: 1932822Syokota * This product includes software developed by the University of 2032822Syokota * California, Berkeley and its contributors. 2132822Syokota * 4. Neither the name of the University nor the names of its contributors 2232822Syokota * may be used to endorse or promote products derived from this software 2332822Syokota * without specific prior written permission. 2432822Syokota * 2532822Syokota * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2643334Syokota * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2732822Syokota * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2832822Syokota * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2932822Syokota * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 3032822Syokota * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 3137204Ssteve * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 3237204Ssteve * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3332822Syokota * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3432822Syokota * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3532822Syokota * SUCH DAMAGE. 3632822Syokota */ 3732822Syokota 3832822Syokota#include <sys/cdefs.h> 3932822Syokota__FBSDID("$FreeBSD: head/sys/amd64/ia32/ia32_syscall.c 211515 2010-08-19 16:41:27Z jhb $"); 4032822Syokota 4132822Syokota/* 4232822Syokota * 386 Trap and System call handling 4332822Syokota */ 4443334Syokota 4543334Syokota#include "opt_clock.h" 4632822Syokota#include "opt_cpu.h" 4732822Syokota#include "opt_isa.h" 4837204Ssteve 4943334Syokota#include <sys/param.h> 5032822Syokota#include <sys/bus.h> 5132822Syokota#include <sys/systm.h> 5232822Syokota#include <sys/proc.h> 5332822Syokota#include <sys/pioctl.h> 5432822Syokota#include <sys/kernel.h> 5532822Syokota#include <sys/ktr.h> 5632822Syokota#include <sys/lock.h> 5732822Syokota#include <sys/mutex.h> 5838140Syokota#include <sys/proc.h> 5932822Syokota#include <sys/ptrace.h> 6043334Syokota#include <sys/resourcevar.h> 6132822Syokota#include <sys/signalvar.h> 6232822Syokota#include <sys/syscall.h> 6332822Syokota#include <sys/sysctl.h> 6432822Syokota#include <sys/sysent.h> 6532822Syokota#include <sys/uio.h> 6632822Syokota#include <sys/vmmeter.h> 6732822Syokota#include <security/audit/audit.h> 6832822Syokota 6932822Syokota#include <vm/vm.h> 7032822Syokota#include <vm/vm_param.h> 7132822Syokota#include <vm/pmap.h> 7232822Syokota#include <vm/vm_kern.h> 7332822Syokota#include <vm/vm_map.h> 7443334Syokota#include <vm/vm_page.h> 7543334Syokota#include <vm/vm_extern.h> 7632822Syokota 7732822Syokota#include <machine/cpu.h> 7832822Syokota#include <machine/intr_machdep.h> 7943334Syokota#include <machine/md_var.h> 8032822Syokota 8132822Syokota#include <compat/freebsd32/freebsd32_util.h> 8243334Syokota 8332822Syokota#define IDTVEC(name) __CONCAT(X,name) 8432822Syokota 8532822Syokotaextern inthand_t IDTVEC(int0x80_syscall), IDTVEC(rsvd); 8632822Syokota 8732822Syokotavoid ia32_syscall(struct trapframe *frame); /* Called from asm code */ 8843334Syokota 8943334Syokotavoid 9032822Syokotaia32_set_syscall_retval(struct thread *td, int error) 9143334Syokota{ 9232822Syokota 9332822Syokota cpu_set_syscall_retval(td, error); 9432822Syokota} 9532822Syokota 9632822Syokotaint 9743334Syokotaia32_fetch_syscall_args(struct thread *td, struct syscall_args *sa) 9832822Syokota{ 9932822Syokota struct proc *p; 10032822Syokota struct trapframe *frame; 10132822Syokota caddr_t params; 10232822Syokota u_int32_t args[8]; 10332822Syokota int error, i; 10432822Syokota 10532822Syokota p = td->td_proc; 10632822Syokota frame = td->td_frame; 10732822Syokota 10843334Syokota params = (caddr_t)frame->tf_rsp + sizeof(u_int32_t); 10943334Syokota sa->code = frame->tf_rax; 11043334Syokota 11143334Syokota /* 11243334Syokota * Need to check if this is a 32 bit or 64 bit syscall. 11343334Syokota */ 11432822Syokota if (sa->code == SYS_syscall) { 11532822Syokota /* 11632822Syokota * Code is first argument, followed by actual args. 11732822Syokota */ 11832822Syokota sa->code = fuword32(params); 11932822Syokota params += sizeof(int); 12032822Syokota } else if (sa->code == SYS___syscall) { 12132822Syokota /* 12232822Syokota * Like syscall, but code is a quad, so as to maintain 12332822Syokota * quad alignment for the rest of the arguments. 12432822Syokota * We use a 32-bit fetch in case params is not 12532822Syokota * aligned. 12632822Syokota */ 12732822Syokota sa->code = fuword32(params); 12832822Syokota params += sizeof(quad_t); 12932822Syokota } 13032822Syokota if (p->p_sysent->sv_mask) 13132822Syokota sa->code &= p->p_sysent->sv_mask; 13232822Syokota if (sa->code >= p->p_sysent->sv_size) 13332822Syokota sa->callp = &p->p_sysent->sv_table[0]; 13432822Syokota else 13532822Syokota sa->callp = &p->p_sysent->sv_table[sa->code]; 13632822Syokota sa->narg = sa->callp->sy_narg; 13732822Syokota 13832822Syokota if (params != NULL && sa->narg != 0) 139 error = copyin(params, (caddr_t)args, 140 (u_int)(sa->narg * sizeof(int))); 141 else 142 error = 0; 143 144 for (i = 0; i < sa->narg; i++) 145 sa->args[i] = args[i]; 146 147 if (error == 0) { 148 td->td_retval[0] = 0; 149 td->td_retval[1] = frame->tf_rdx; 150 } 151 152 return (error); 153} 154 155void 156ia32_syscall(struct trapframe *frame) 157{ 158 struct thread *td; 159 struct syscall_args sa; 160 register_t orig_tf_rflags; 161 int error; 162 ksiginfo_t ksi; 163 164 orig_tf_rflags = frame->tf_rflags; 165 td = curthread; 166 td->td_frame = frame; 167 168 error = syscallenter(td, &sa); 169 170 /* 171 * Traced syscall. 172 */ 173 if (orig_tf_rflags & PSL_T) { 174 frame->tf_rflags &= ~PSL_T; 175 ksiginfo_init_trap(&ksi); 176 ksi.ksi_signo = SIGTRAP; 177 ksi.ksi_code = TRAP_TRACE; 178 ksi.ksi_addr = (void *)frame->tf_rip; 179 trapsignal(td, &ksi); 180 } 181 182 syscallret(td, error, &sa); 183} 184 185static void 186ia32_syscall_enable(void *dummy) 187{ 188 189 setidt(IDT_SYSCALL, &IDTVEC(int0x80_syscall), SDT_SYSIGT, SEL_UPL, 0); 190} 191 192static void 193ia32_syscall_disable(void *dummy) 194{ 195 196 setidt(IDT_SYSCALL, &IDTVEC(rsvd), SDT_SYSIGT, SEL_KPL, 0); 197} 198 199SYSINIT(ia32_syscall, SI_SUB_EXEC, SI_ORDER_ANY, ia32_syscall_enable, NULL); 200SYSUNINIT(ia32_syscall, SI_SUB_EXEC, SI_ORDER_ANY, ia32_syscall_disable, NULL); 201