ia32_trap.c revision 151316
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: head/sys/ia64/ia32/ia32_trap.c 151316 2005-10-14 12:43:47Z davidxu $"); 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/signalvar.h> 40#include <sys/syscall.h> 41#include <sys/sysent.h> 42#include <machine/cpu.h> 43#include <machine/fpu.h> 44#include <machine/frame.h> 45#include <machine/md_var.h> 46#include <i386/include/psl.h> 47 48#ifdef WITNESS 49extern char *syscallnames[]; 50#endif 51 52static void 53ia32_syscall(struct trapframe *tf) 54{ 55 uint64_t args64[8]; 56 uint32_t args[8]; 57 struct thread *td; 58 struct proc *p; 59 struct sysent *callp; 60 caddr_t params; 61 register_t eflags; 62 u_int code; 63 int error, i, narg; 64 ksiginfo_t ksi; 65 66 PCPU_LAZY_INC(cnt.v_syscall); 67 68 td = curthread; 69 params = (caddr_t)(tf->tf_special.sp & ((1L<<32)-1)) + 70 sizeof(uint32_t); 71 code = tf->tf_scratch.gr8; /* eax */ 72 eflags = ia64_get_eflag(); 73 p = td->td_proc; 74 75 if (p->p_sysent->sv_prepsyscall == NULL) { 76 if (code == SYS_syscall) { 77 /* Code is first argument, followed by actual args. */ 78 code = fuword32(params); 79 params += sizeof(int); 80 } else if (code == SYS___syscall) { 81 /* 82 * Like syscall, but code is a quad, so as to maintain 83 * quad alignment for the rest of the arguments. We 84 * use a 32-bit fetch in case params is not aligned. 85 */ 86 code = fuword32(params); 87 params += sizeof(quad_t); 88 } 89 } else 90 (*p->p_sysent->sv_prepsyscall)(tf, args, &code, ¶ms); 91 92 if (p->p_sysent->sv_mask) 93 code &= p->p_sysent->sv_mask; 94 95 if (code >= p->p_sysent->sv_size) 96 callp = &p->p_sysent->sv_table[0]; 97 else 98 callp = &p->p_sysent->sv_table[code]; 99 100 narg = callp->sy_narg & SYF_ARGMASK; 101 102 /* copyin and the ktrsyscall()/ktrsysret() code is MP-aware */ 103 if (params != NULL && narg != 0) 104 error = copyin(params, (caddr_t)args, narg * sizeof(int)); 105 else 106 error = 0; 107 108 for (i = 0; i < narg; i++) 109 args64[i] = args[i]; 110 111#ifdef KTRACE 112 if (KTRPOINT(td, KTR_SYSCALL)) 113 ktrsyscall(code, narg, args64); 114#endif 115 /* 116 * Try to run the syscall without Giant if the syscall 117 * is MP safe. 118 */ 119 if ((callp->sy_narg & SYF_MPSAFE) == 0) 120 mtx_lock(&Giant); 121 122 if (error == 0) { 123 td->td_retval[0] = 0; 124 td->td_retval[1] = tf->tf_scratch.gr10; /* edx */ 125 126 STOPEVENT(p, S_SCE, narg); 127 128 error = (*callp->sy_call)(td, args64); 129 } 130 131 switch (error) { 132 case 0: 133 tf->tf_scratch.gr8 = td->td_retval[0]; /* eax */ 134 tf->tf_scratch.gr10 = td->td_retval[1]; /* edx */ 135 ia64_set_eflag(ia64_get_eflag() & ~PSL_C); 136 break; 137 138 case ERESTART: 139 /* 140 * Reconstruct pc, assuming lcall $X,y is 7 bytes, 141 * int 0x80 is 2 bytes. XXX Assume int 0x80. 142 */ 143 tf->tf_special.iip -= 2; 144 break; 145 146 case EJUSTRETURN: 147 break; 148 149 default: 150 if (p->p_sysent->sv_errsize) { 151 if (error >= p->p_sysent->sv_errsize) 152 error = -1; /* XXX */ 153 else 154 error = p->p_sysent->sv_errtbl[error]; 155 } 156 tf->tf_scratch.gr8 = error; 157 ia64_set_eflag(ia64_get_eflag() | PSL_C); 158 break; 159 } 160 161 /* 162 * Release Giant if we previously set it. 163 */ 164 if ((callp->sy_narg & SYF_MPSAFE) == 0) 165 mtx_unlock(&Giant); 166 167 /* 168 * Traced syscall. 169 */ 170 if ((eflags & PSL_T) && !(eflags & PSL_VM)) { 171 ia64_set_eflag(ia64_get_eflag() & ~PSL_T); 172 ksiginfo_init_trap(&ksi); 173 ksi.ksi_signo = SIGTRAP; 174 ksi.ksi_code = TRAP_TRACE; 175 ksi.ksi_addr = (void *)tf->tf_special.iip; 176 trapsignal(td, &ksi); 177 } 178 179#ifdef KTRACE 180 if (KTRPOINT(td, KTR_SYSRET)) 181 ktrsysret(code, error, td->td_retval[0]); 182#endif 183 184 /* 185 * This works because errno is findable through the 186 * register set. If we ever support an emulation where this 187 * is not the case, this code will need to be revisited. 188 */ 189 STOPEVENT(p, S_SCX, code); 190 191 WITNESS_WARN(WARN_PANIC, NULL, "System call %s returning", 192 (code >= 0 && code < SYS_MAXSYSCALL) ? syscallnames[code] : "???"); 193 mtx_assert(&sched_lock, MA_NOTOWNED); 194 mtx_assert(&Giant, MA_NOTOWNED); 195} 196 197/* 198 * ia32_trap() is called from exception.S to handle the IA-32 specific 199 * interruption vectors. 200 */ 201void 202ia32_trap(int vector, struct trapframe *tf) 203{ 204 struct proc *p; 205 struct thread *td; 206 uint64_t ucode; 207 int sig; 208 u_int sticks; 209 ksiginfo_t ksi; 210 211 KASSERT(TRAPF_USERMODE(tf), ("%s: In kernel mode???", __func__)); 212 213 ia64_set_fpsr(IA64_FPSR_DEFAULT); 214 PCPU_LAZY_INC(cnt.v_trap); 215 216 td = curthread; 217 td->td_frame = tf; 218 sticks = td->td_sticks; 219 p = td->td_proc; 220 if (td->td_ucred != p->p_ucred) 221 cred_update_thread(td); 222 sig = 0; 223 ucode = 0; 224 switch (vector) { 225 case IA64_VEC_IA32_EXCEPTION: 226 switch ((tf->tf_special.isr >> 16) & 0xffff) { 227 case IA32_EXCEPTION_DIVIDE: 228 ucode = FPE_INTDIV; 229 sig = SIGFPE; 230 break; 231 case IA32_EXCEPTION_DEBUG: 232 case IA32_EXCEPTION_BREAK: 233 sig = SIGTRAP; 234 break; 235 case IA32_EXCEPTION_OVERFLOW: 236 ucode = FPE_INTOVF; 237 sig = SIGFPE; 238 break; 239 case IA32_EXCEPTION_BOUND: 240 ucode = FPE_FLTSUB; 241 sig = SIGFPE; 242 break; 243 case IA32_EXCEPTION_DNA: 244 ucode = 0; 245 sig = SIGFPE; 246 break; 247 case IA32_EXCEPTION_NOT_PRESENT: 248 case IA32_EXCEPTION_STACK_FAULT: 249 case IA32_EXCEPTION_GPFAULT: 250 ucode = (tf->tf_special.isr & 0xffff) + BUS_SEGM_FAULT; 251 sig = SIGBUS; 252 break; 253 case IA32_EXCEPTION_FPERROR: 254 ucode = 0; /* XXX */ 255 sig = SIGFPE; 256 break; 257 case IA32_EXCEPTION_ALIGNMENT_CHECK: 258 ucode = tf->tf_special.ifa; /* VA */ 259 sig = SIGBUS; 260 break; 261 case IA32_EXCEPTION_STREAMING_SIMD: 262 ucode = 0; /* XXX */ 263 sig = SIGFPE; 264 break; 265 default: 266 trap_panic(vector, tf); 267 break; 268 } 269 break; 270 271 case IA64_VEC_IA32_INTERCEPT: 272 /* XXX Maybe need to emulate ia32 instruction. */ 273 trap_panic(vector, tf); 274 275 case IA64_VEC_IA32_INTERRUPT: 276 /* INT n instruction - probably a syscall. */ 277 if (((tf->tf_special.isr >> 16) & 0xffff) == 0x80) { 278 ia32_syscall(tf); 279 goto out; 280 } 281 ucode = (tf->tf_special.isr >> 16) & 0xffff; 282 sig = SIGILL; 283 break; 284 285 default: 286 /* Should never happen of course. */ 287 trap_panic(vector, tf); 288 break; 289 } 290 291 KASSERT(sig != 0, ("%s: signal not set", __func__)); 292 293 ksiginfo_init_trap(&ksi); 294 ksi.ksi_signo = sig; 295 ksi.ksi_code = (int)ucode; /* XXX */ 296 /* ksi.ksi_addr */ 297 trapsignal(td, &ksi); 298 299out: 300 userret(td, tf, sticks); 301 mtx_assert(&Giant, MA_NOTOWNED); 302 do_ast(tf); 303} 304