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("$FreeBSD$"); 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 49 #include <sys/param.h> 50 #include <sys/bus.h> 51 #include <sys/systm.h> 52 #include <sys/proc.h> 53 #include <sys/pioctl.h> 54 #include <sys/kernel.h> 55 #include <sys/ktr.h> 56 #include <sys/lock.h> 57 #include <sys/mutex.h> 58 #include <sys/proc.h> 59 #include <sys/ptrace.h> 60 #include <sys/resourcevar.h> 61 #include <sys/signalvar.h> 62 #include <sys/syscall.h> 63 #include <sys/sysctl.h> 64 #include <sys/sysent.h> 65 #include <sys/uio.h> 66 #include <sys/vmmeter.h> 67 #include <security/audit/audit.h> 68 69 #include <vm/vm.h> 70 #include <vm/vm_param.h> 71 #include <vm/pmap.h> 72 #include <vm/vm_kern.h> 73 #include <vm/vm_map.h> 74 #include <vm/vm_page.h> 75 #include <vm/vm_extern.h> 76 77 #include <machine/cpu.h> 78 #include <machine/intr_machdep.h> 79 #include <machine/md_var.h> 80 81 #include <compat/freebsd32/freebsd32_util.h> 82 83 #define IDTVEC(name) __CONCAT(X,name) 84 85 extern inthand_t IDTVEC(int0x80_syscall), IDTVEC(rsvd); 86 87 void ia32_syscall(struct trapframe *frame); /* Called from asm code */ 88 89 void 90 ia32_set_syscall_retval(struct thread *td, int error) 91 { 92 93 cpu_set_syscall_retval(td, error); 94 } 95 96 int 97 ia32_fetch_syscall_args(struct thread *td, struct syscall_args *sa) 98 { 99 struct proc *p; 100 struct trapframe *frame; 101 caddr_t params; 102 u_int32_t args[8]; 103 int error, i; 104 105 p = td->td_proc; 106 frame = td->td_frame; 107 108 params = (caddr_t)frame->tf_rsp + sizeof(u_int32_t); 109 sa->code = frame->tf_rax; 110 111 /* 112 * Need to check if this is a 32 bit or 64 bit syscall. 113 */ 114 if (sa->code == SYS_syscall) { 115 /* 116 * Code is first argument, followed by actual args. 117 */ 118 sa->code = fuword32(params); 119 params += sizeof(int); 120 } else if (sa->code == SYS___syscall) { 121 /* 122 * Like syscall, but code is a quad, so as to maintain 123 * quad alignment for the rest of the arguments. 124 * We use a 32-bit fetch in case params is not 125 * aligned. 126 */ 127 sa->code = fuword32(params); 128 params += sizeof(quad_t); 129 } 130 if (p->p_sysent->sv_mask) 131 sa->code &= p->p_sysent->sv_mask; 132 if (sa->code >= p->p_sysent->sv_size) 133 sa->callp = &p->p_sysent->sv_table[0]; 134 else 135 sa->callp = &p->p_sysent->sv_table[sa->code]; 136 sa->narg = sa->callp->sy_narg; 137 138 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 } 154 155 void 156 ia32_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 } 184 185 static void 186 ia32_syscall_enable(void *dummy) 187 { 188 189 setidt(IDT_SYSCALL, &IDTVEC(int0x80_syscall), SDT_SYSIGT, SEL_UPL, 0); 190 } 191 192 static void 193 ia32_syscall_disable(void *dummy) 194 { 195 196 setidt(IDT_SYSCALL, &IDTVEC(rsvd), SDT_SYSIGT, SEL_KPL, 0); 197 } 198 199 SYSINIT(ia32_syscall, SI_SUB_EXEC, SI_ORDER_ANY, ia32_syscall_enable, NULL); 200 SYSUNINIT(ia32_syscall, SI_SUB_EXEC, SI_ORDER_ANY, ia32_syscall_disable, NULL); 201