1/*- 2 * Copyright (c) 2004 Marcel Moolenaar 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD$"); 29 30#include <sys/param.h> 31#include <sys/systm.h> 32#include <sys/ktr.h> 33#include <sys/sysproto.h> 34#include <sys/kernel.h> 35#include <sys/lock.h> 36#include <sys/mutex.h> 37#include <sys/pioctl.h> 38#include <sys/proc.h> 39#include <sys/ptrace.h> 40#include <sys/signalvar.h> 41#include <sys/syscall.h> 42#include <sys/sysent.h> 43#include <machine/cpu.h> 44#include <machine/fpu.h> 45#include <machine/frame.h> 46#include <machine/md_var.h> 47#include <x86/include/psl.h> 48 49#include <security/audit/audit.h> 50 51#include <compat/ia32/ia32_util.h> 52 53void 54ia32_set_syscall_retval(struct thread *td, int error) 55{ 56 struct proc *p; 57 struct trapframe *tf; 58 59 tf = td->td_frame; 60 61 switch (error) { 62 case 0: 63 tf->tf_scratch.gr8 = td->td_retval[0]; /* eax */ 64 tf->tf_scratch.gr10 = td->td_retval[1]; /* edx */ 65 ia64_set_eflag(ia64_get_eflag() & ~PSL_C); 66 break; 67 68 case ERESTART: 69 /* 70 * Reconstruct pc, assuming lcall $X,y is 7 bytes, 71 * int 0x80 is 2 bytes. XXX Assume int 0x80. 72 */ 73 tf->tf_special.iip -= 2; 74 break; 75 76 case EJUSTRETURN: 77 break; 78 79 default: 80 p = td->td_proc; 81 if (p->p_sysent->sv_errsize) { 82 if (error >= p->p_sysent->sv_errsize) 83 error = -1; /* XXX */ 84 else 85 error = p->p_sysent->sv_errtbl[error]; 86 } 87 tf->tf_scratch.gr8 = error; 88 ia64_set_eflag(ia64_get_eflag() | PSL_C); 89 break; 90 } 91} 92 93int 94ia32_fetch_syscall_args(struct thread *td, struct syscall_args *sa) 95{ 96 struct trapframe *tf; 97 struct proc *p; 98 uint32_t args[8]; 99 caddr_t params; 100 int error, i; 101 102 tf = td->td_frame; 103 p = td->td_proc; 104 105 params = (caddr_t)(tf->tf_special.sp & ((1L<<32)-1)) + 106 sizeof(uint32_t); 107 sa->code = tf->tf_scratch.gr8; /* eax */ 108 109 if (sa->code == SYS_syscall) { 110 /* Code is first argument, followed by actual args. */ 111 sa->code = fuword32(params); 112 params += sizeof(int); 113 } else if (sa->code == SYS___syscall) { 114 /* 115 * Like syscall, but code is a quad, so as to maintain 116 * quad alignment for the rest of the arguments. We 117 * use a 32-bit fetch in case params is not aligned. 118 */ 119 sa->code = fuword32(params); 120 params += sizeof(quad_t); 121 } 122 123 if (p->p_sysent->sv_mask) 124 sa->code &= p->p_sysent->sv_mask; 125 if (sa->code >= p->p_sysent->sv_size) 126 sa->callp = &p->p_sysent->sv_table[0]; 127 else 128 sa->callp = &p->p_sysent->sv_table[sa->code]; 129 sa->narg = sa->callp->sy_narg; 130 131 if (params != NULL && sa->narg != 0) 132 error = copyin(params, (caddr_t)args, sa->narg * sizeof(int)); 133 else 134 error = 0; 135 sa->args = &sa->args32[0]; 136 137 if (error == 0) { 138 for (i = 0; i < sa->narg; i++) 139 sa->args32[i] = args[i]; 140 td->td_retval[0] = 0; 141 td->td_retval[1] = tf->tf_scratch.gr10; /* edx */ 142 } 143 144 return (error); 145} 146 147#include "../../kern/subr_syscall.c" 148 149static void 150ia32_syscall(struct trapframe *tf) 151{ 152 struct thread *td; 153 struct syscall_args sa; 154 register_t eflags; 155 int error; 156 ksiginfo_t ksi; 157 158 td = curthread; 159 eflags = ia64_get_eflag(); 160 161 error = syscallenter(td, &sa); 162 163 /* 164 * Traced syscall. 165 */ 166 if ((eflags & PSL_T) && !(eflags & PSL_VM)) { 167 ia64_set_eflag(ia64_get_eflag() & ~PSL_T); 168 ksiginfo_init_trap(&ksi); 169 ksi.ksi_signo = SIGTRAP; 170 ksi.ksi_code = TRAP_TRACE; 171 ksi.ksi_addr = (void *)tf->tf_special.iip; 172 trapsignal(td, &ksi); 173 } 174 175 syscallret(td, error, &sa); 176} 177 178/* 179 * ia32_trap() is called from exception.S to handle the IA-32 specific 180 * interruption vectors. 181 */ 182void 183ia32_trap(int vector, struct trapframe *tf) 184{ 185 struct proc *p; 186 struct thread *td; 187 uint64_t ucode; 188 int sig; 189 ksiginfo_t ksi; 190 191 KASSERT(TRAPF_USERMODE(tf), ("%s: In kernel mode???", __func__)); 192 193 ia64_set_fpsr(IA64_FPSR_DEFAULT); 194 PCPU_INC(cnt.v_trap); 195 196 td = curthread; 197 td->td_frame = tf; 198 td->td_pticks = 0; 199 p = td->td_proc; 200 if (td->td_ucred != p->p_ucred) 201 cred_update_thread(td); 202 sig = 0; 203 ucode = 0; 204 switch (vector) { 205 case IA64_VEC_IA32_EXCEPTION: 206 switch ((tf->tf_special.isr >> 16) & 0xffff) { 207 case IA32_EXCEPTION_DIVIDE: 208 ucode = FPE_INTDIV; 209 sig = SIGFPE; 210 break; 211 case IA32_EXCEPTION_DEBUG: 212 case IA32_EXCEPTION_BREAK: 213 sig = SIGTRAP; 214 break; 215 case IA32_EXCEPTION_OVERFLOW: 216 ucode = FPE_INTOVF; 217 sig = SIGFPE; 218 break; 219 case IA32_EXCEPTION_BOUND: 220 ucode = FPE_FLTSUB; 221 sig = SIGFPE; 222 break; 223 case IA32_EXCEPTION_DNA: 224 ucode = 0; 225 sig = SIGFPE; 226 break; 227 case IA32_EXCEPTION_NOT_PRESENT: 228 case IA32_EXCEPTION_STACK_FAULT: 229 case IA32_EXCEPTION_GPFAULT: 230 ucode = (tf->tf_special.isr & 0xffff) + BUS_SEGM_FAULT; 231 sig = SIGBUS; 232 break; 233 case IA32_EXCEPTION_FPERROR: 234 ucode = 0; /* XXX */ 235 sig = SIGFPE; 236 break; 237 case IA32_EXCEPTION_ALIGNMENT_CHECK: 238 ucode = tf->tf_special.ifa; /* VA */ 239 sig = SIGBUS; 240 break; 241 case IA32_EXCEPTION_STREAMING_SIMD: 242 ucode = 0; /* XXX */ 243 sig = SIGFPE; 244 break; 245 default: 246 trap_panic(vector, tf); 247 break; 248 } 249 break; 250 251 case IA64_VEC_IA32_INTERCEPT: 252 /* XXX Maybe need to emulate ia32 instruction. */ 253 trap_panic(vector, tf); 254 255 case IA64_VEC_IA32_INTERRUPT: 256 /* INT n instruction - probably a syscall. */ 257 if (((tf->tf_special.isr >> 16) & 0xffff) == 0x80) { 258 ia32_syscall(tf); 259 goto out; 260 } 261 ucode = (tf->tf_special.isr >> 16) & 0xffff; 262 sig = SIGILL; 263 break; 264 265 default: 266 /* Should never happen of course. */ 267 trap_panic(vector, tf); 268 break; 269 } 270 271 KASSERT(sig != 0, ("%s: signal not set", __func__)); 272 273 ksiginfo_init_trap(&ksi); 274 ksi.ksi_signo = sig; 275 ksi.ksi_code = (int)ucode; /* XXX */ 276 /* ksi.ksi_addr */ 277 trapsignal(td, &ksi); 278 279out: 280 userret(td, tf); 281 do_ast(tf); 282} 283