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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 | /* * Linux/PARISC Project (http://www.thepuffingroup.com/parisc) * * System call entry code Copyright (c) Matthew Wilcox 1999 <willy@bofh.ai> * Licensed under the GNU GPL. * thanks to Philipp Rumpf, Mike Shaver and various others * sorry about the wall, puffin.. */ #include <asm/offset.h> #include <asm/unistd.h> #include <asm/errno.h> #include <asm/psw.h> #define __ASSEMBLY__ #include <asm/assembly.h> #include <asm/processor.h> #include <linux/version.h> #ifdef __LP64__ .level 2.0w #else .level 1.1 #endif .text .import syscall_exit,code .import syscall_exit_rfi,code .export linux_gateway_page /* Linux gateway page is aliased to virtual page 0 in the kernel * address space. Since it is a gateway page it cannot be * dereferenced, so null pointers will still fault. We start * the actual entry point at 0x100. We put break instructions * at the beginning of the page to trap null indirect function * pointers. */ .align 4096 linux_gateway_page: break 0,0 .align 256 linux_gateway_entry: mfsp %sr7,%r1 /* we must set sr3 to the space */ mtsp %r1,%sr3 /* of the user before the gate */ gate .+8, %r0 /* become privileged */ mtsp %r0,%sr4 /* get kernel space into sr4 */ mtsp %r0,%sr5 /* get kernel space into sr5 */ mtsp %r0,%sr6 /* get kernel space into sr6 */ mtsp %r0,%sr7 /* get kernel space into sr7 */ #ifdef __LP64__ /* for now we can *always* set the W bit on entry to the syscall * since we don't support wide userland processes. We could * also save the current SM other than in r0 and restore it on * exit from the syscall, and also use that value to know * whether to do narrow or wide syscalls. -PB */ ssm PSW_SM_W, %r0 #endif mtctl %r28,%cr27 rsm PSW_I, %r28 /* no ints for a bit */ mfctl %cr30,%r1 /* get the kernel task ptr */ mtctl %r0,%cr30 /* zero it (flag) */ /* Save some registers for sigcontext and potential task switch (see entry.S for the details of which ones are saved/restored) */ STREG %r2, TASK_PT_GR2(%r1) /* preserve rp */ STREG %r19, TASK_PT_GR19(%r1) STREG %r20, TASK_PT_GR20(%r1) STREG %r21, TASK_PT_GR21(%r1) STREG %r22, TASK_PT_GR22(%r1) STREG %r23, TASK_PT_GR23(%r1) /* 4th argument */ STREG %r24, TASK_PT_GR24(%r1) /* 3rd argument */ STREG %r25, TASK_PT_GR25(%r1) /* 2nd argument */ STREG %r26, TASK_PT_GR26(%r1) /* 1st argument */ STREG %r27, TASK_PT_GR27(%r1) /* user dp */ mfctl %cr27,%r19 STREG %r19, TASK_PT_GR28(%r1) /* return value 0 */ STREG %r19, TASK_PT_ORIG_R28(%r1) /* return value 0 (saved for signals) */ STREG %r29, TASK_PT_GR29(%r1) /* return value 1 */ STREG %r30, TASK_PT_GR30(%r1) /* preserve userspace sp */ STREG %r31, TASK_PT_GR31(%r1) /* preserve syscall return ptr */ ldo TASK_PT_FR0(%r1), %r27 /* save fpregs from the kernel */ save_fp %r27 /* or potential task switch */ mfctl %cr11, %r27 /* i.e. SAR */ STREG %r27, TASK_PT_SAR(%r1) loadgp ldo TASK_SZ_ALGN+64(%r1),%r30 /* set up kernel stack */ #ifndef __LP64__ /* no need to save these on stack because in wide mode the first 8 * args are passed in registers */ stw %r22, -52(%r30) /* 5th argument */ stw %r21, -56(%r30) /* 6th argument */ #endif /* for some unknown reason, task_struct.ptrace is an unsigned long so use LDREG */ LDREG TASK_PTRACE(%r1), %r19 /* Are we being ptraced? */ mtsm %r28 /* irqs back */ bb,<,n %r19, 31, .Ltracesys /* must match PT_PTRACE bit */ /* Note! We cannot use the syscall table that is mapped nearby since the gateway page is mapped execute-only. */ ldil L%sys_call_table, %r1 ldo R%sys_call_table(%r1), %r19 LDIL_FIXUP(%r19) comiclr,>>= __NR_Linux_syscalls, %r20, %r0 b,n .Lsyscall_nosys #ifdef __LP64__ ldd,s %r20(%r19), %r19 #else ldwx,s %r20(%r19), %r19 #endif /* If this is a sys_rt_sigreturn call, and the signal was received * when not in_syscall, then we want to return via syscall_exit_rfi, * not syscall_exit. Signal no. in r20, in_syscall in r25 (see * trampoline code in signal.c). */ ldi __NR_rt_sigreturn,%r2 comb,= %r2,%r20,.Lrt_sigreturn .Lin_syscall: ldil L%syscall_exit,%r2 LDIL_FIXUP(%r2) be 0(%sr7,%r19) ldo R%syscall_exit(%r2),%r2 .Lrt_sigreturn: comib,<> 0,%r25,.Lin_syscall ldil L%syscall_exit_rfi,%r2 LDIL_FIXUP(%r2) be 0(%sr7,%r19) ldo R%syscall_exit_rfi(%r2),%r2 /* Note! Because we are not running where we were linked, any calls to functions external to this file must be indirect. To be safe, we apply the opposite rule to functions within this file, with local labels given to them to ensure correctness. */ .Lsyscall_nosys: syscall_nosys: ldil L%syscall_exit,%r1 LDIL_FIXUP(%r1) be R%syscall_exit(%sr7,%r1) ldo -ENOSYS(%r0),%r28 /* set errno */ /* Warning! This trace code is a virtual duplicate of the code above so be * sure to maintain both! */ .Ltracesys: tracesys: /* Need to save more registers so the debugger can see where we * are. */ ldo -TASK_SZ_ALGN-64(%r30),%r1 /* get task ptr */ ssm 0,%r2 /* Lower 8 bits only!! */ STREG %r2,TASK_PT_PSW(%r1) STREG %r1,TASK_PT_CR30(%r1) mfsp %sr0,%r2 STREG %r2,TASK_PT_SR0(%r1) mfsp %sr1,%r2 STREG %r2,TASK_PT_SR1(%r1) mfsp %sr2,%r2 STREG %r2,TASK_PT_SR2(%r1) mfsp %sr3,%r2 STREG %r2,TASK_PT_SR3(%r1) STREG %r2,TASK_PT_SR4(%r1) STREG %r2,TASK_PT_SR5(%r1) STREG %r2,TASK_PT_SR6(%r1) STREG %r2,TASK_PT_SR7(%r1) STREG %r2,TASK_PT_IASQ0(%r1) STREG %r2,TASK_PT_IASQ1(%r1) LDREG TASK_PT_GR31(%r1),%r2 STREG %r2,TASK_PT_IAOQ0(%r1) ldo 4(%r2),%r2 STREG %r2,TASK_PT_IAOQ1(%r1) ldo TASK_REGS(%r1),%r2 /* reg_save %r2 */ STREG %r3,PT_GR3(%r2) STREG %r4,PT_GR4(%r2) STREG %r5,PT_GR5(%r2) STREG %r6,PT_GR6(%r2) STREG %r7,PT_GR7(%r2) STREG %r8,PT_GR8(%r2) STREG %r9,PT_GR9(%r2) STREG %r10,PT_GR10(%r2) STREG %r11,PT_GR11(%r2) STREG %r12,PT_GR12(%r2) STREG %r13,PT_GR13(%r2) STREG %r14,PT_GR14(%r2) STREG %r15,PT_GR15(%r2) STREG %r16,PT_GR16(%r2) STREG %r17,PT_GR17(%r2) STREG %r18,PT_GR18(%r2) /* Finished saving things for the debugger */ ldil L%syscall_trace,%r1 LDIL_FIXUP(%r1) ldil L%tracesys_next,%r2 LDIL_FIXUP(%r2) be R%syscall_trace(%sr7,%r1) ldo R%tracesys_next(%r2),%r2 tracesys_next: ldil L%sys_call_table,%r1 LDIL_FIXUP(%r1) ldo R%sys_call_table(%r1), %r19 ldo -TASK_SZ_ALGN-64(%r30),%r1 /* get task ptr */ LDREG TASK_PT_GR20(%r1), %r20 LDREG TASK_PT_GR26(%r1), %r26 /* Restore the users args */ LDREG TASK_PT_GR25(%r1), %r25 LDREG TASK_PT_GR24(%r1), %r24 LDREG TASK_PT_GR23(%r1), %r23 #ifdef __LP64__ LDREG TASK_PT_GR22(%r1), %r22 LDREG TASK_PT_GR21(%r1), %r21 #endif comiclr,>>= __NR_Linux_syscalls, %r20, %r0 b,n .Lsyscall_nosys #ifdef __LP64__ ldd,s %r20(%r19), %r19 #else ldwx,s %r20(%r19), %r19 #endif /* If this is a sys_rt_sigreturn call, and the signal was received * when not in_syscall, then we want to return via syscall_exit_rfi, * not syscall_exit. Signal no. in r20, in_syscall in r25 (see * trampoline code in signal.c). */ ldi __NR_rt_sigreturn,%r2 comb,= %r2,%r20,.Ltrace_rt_sigreturn .Ltrace_in_syscall: ldil L%tracesys_exit,%r2 LDIL_FIXUP(%r2) be 0(%sr7,%r19) ldo R%tracesys_exit(%r2),%r2 /* Do *not* call this function on the gateway page, because it makes a direct call to syscall_trace. */ tracesys_exit: ldo -TASK_SZ_ALGN-64(%r30),%r1 /* get task ptr */ bl syscall_trace, %r2 STREG %r28,TASK_PT_GR28(%r1) /* save return value now */ ldo -TASK_SZ_ALGN-64(%r30),%r1 /* get task ptr */ LDREG TASK_PT_GR28(%r1), %r28 /* Restore return val. */ ldil L%syscall_exit,%r1 LDIL_FIXUP(%r1) be,n R%syscall_exit(%sr7,%r1) .Ltrace_rt_sigreturn: comib,<> 0,%r25,.Ltrace_in_syscall ldil L%tracesys_sigexit,%r2 LDIL_FIXUP(%r2) be 0(%sr7,%r19) ldo R%tracesys_sigexit(%r2),%r2 tracesys_sigexit: ldo -TASK_SZ_ALGN-64(%r30),%r1 /* get task ptr */ bl syscall_trace, %r2 nop ldil L%syscall_exit_rfi,%r1 LDIL_FIXUP(%r1) be,n R%syscall_exit_rfi(%sr7,%r1) #ifdef __LP64__ /* Use ENTRY_SAME for 32-bit syscalls which are the same on wide and * narrow palinux. Use ENTRY_DIFF for those where a 32-bit specific * implementation is required on wide palinux. */ #define ENTRY_SAME(_name_) .dword sys_##_name_ #define ENTRY_DIFF(_name_) .dword sys32_##_name_ #define ENTRY_UHOH(_name_) .dword sys32_unimplemented #else #define ENTRY_SAME(_name_) .word sys_##_name_ #define ENTRY_DIFF(_name_) .word sys_##_name_ #define ENTRY_UHOH(_name_) .word sys_##_name_ #endif .align 8 .export sys_call_table .Lsys_call_table: sys_call_table: ENTRY_SAME(ni_syscall) /* 0 - old "setup()" system call*/ ENTRY_SAME(exit) ENTRY_SAME(fork_wrapper) ENTRY_SAME(read) ENTRY_SAME(write) ENTRY_SAME(open) /* 5 */ ENTRY_SAME(close) ENTRY_SAME(waitpid) ENTRY_SAME(creat) ENTRY_SAME(link) ENTRY_SAME(unlink) /* 10 */ ENTRY_DIFF(execve_wrapper) ENTRY_SAME(chdir) /* See comments in kernel/time.c!!! Maybe we don't need this? */ ENTRY_DIFF(time) ENTRY_SAME(mknod) ENTRY_SAME(chmod) /* 15 */ ENTRY_SAME(lchown) ENTRY_SAME(socket) /* struct stat is MAYBE identical wide and narrow ?? */ ENTRY_DIFF(newstat) ENTRY_SAME(lseek) ENTRY_SAME(getpid) /* 20 */ /* the 'void * data' parameter may need re-packing in wide */ ENTRY_DIFF(mount) /* concerned about struct sockaddr in wide/narrow */ /* ---> I think sockaddr is OK unless the compiler packs the struct */ /* differently to align the char array */ ENTRY_SAME(bind) ENTRY_SAME(setuid) ENTRY_SAME(getuid) ENTRY_SAME(stime) /* 25 */ ENTRY_SAME(ptrace) ENTRY_SAME(alarm) /* see stat comment */ ENTRY_DIFF(newfstat) ENTRY_SAME(pause) /* struct utimbuf uses time_t which might vary */ ENTRY_DIFF(utime) /* 30 */ /* struct sockaddr... */ ENTRY_SAME(connect) ENTRY_SAME(listen) ENTRY_SAME(access) ENTRY_SAME(nice) /* struct sockaddr... */ ENTRY_SAME(accept) /* 35 */ ENTRY_SAME(sync) ENTRY_SAME(kill) ENTRY_SAME(rename) ENTRY_SAME(mkdir) ENTRY_SAME(rmdir) /* 40 */ ENTRY_SAME(dup) ENTRY_SAME(pipe) ENTRY_DIFF(times) /* struct sockaddr... */ ENTRY_SAME(getsockname) /* it seems possible brk() could return a >4G pointer... */ ENTRY_SAME(brk) /* 45 */ ENTRY_SAME(setgid) ENTRY_SAME(getgid) ENTRY_SAME(signal) ENTRY_SAME(geteuid) ENTRY_SAME(getegid) /* 50 */ ENTRY_SAME(acct) ENTRY_SAME(umount) /* struct sockaddr... */ ENTRY_SAME(getpeername) /* This one's a huge ugly mess */ ENTRY_DIFF(ioctl) /* struct flock? */ ENTRY_DIFF(fcntl) /* 55 */ ENTRY_SAME(socketpair) ENTRY_SAME(setpgid) ENTRY_SAME(send) ENTRY_SAME(newuname) ENTRY_SAME(umask) /* 60 */ ENTRY_SAME(chroot) ENTRY_SAME(ustat) ENTRY_SAME(dup2) ENTRY_SAME(getppid) ENTRY_SAME(getpgrp) /* 65 */ ENTRY_SAME(setsid) ENTRY_SAME(pivot_root) /* I don't like this */ ENTRY_UHOH(sgetmask) ENTRY_UHOH(ssetmask) ENTRY_SAME(setreuid) /* 70 */ ENTRY_SAME(setregid) ENTRY_SAME(mincore) ENTRY_DIFF(sigpending) ENTRY_SAME(sethostname) /* Following 3 have linux-common-code structs containing longs -( */ ENTRY_DIFF(setrlimit) /* 75 */ ENTRY_DIFF(getrlimit) ENTRY_DIFF(getrusage) /* struct timeval and timezone are maybe?? consistent wide and narrow */ ENTRY_SAME(gettimeofday) ENTRY_SAME(settimeofday) ENTRY_SAME(getgroups) /* 80 */ ENTRY_SAME(setgroups) /* struct socketaddr... */ ENTRY_SAME(sendto) ENTRY_SAME(symlink) /* see stat comment */ ENTRY_DIFF(newlstat) ENTRY_SAME(readlink) /* 85 */ /* suspect we'll need some work for narrow shlibs on wide kernel */ ENTRY_UHOH(uselib) ENTRY_SAME(swapon) ENTRY_SAME(reboot) /* argh! struct dirent contains a long */ ENTRY_UHOH(old_readdir) /* I'm not certain about off_t... */ ENTRY_SAME(mmap) /* 90 */ ENTRY_SAME(munmap) ENTRY_SAME(truncate) ENTRY_SAME(ftruncate) ENTRY_SAME(fchmod) ENTRY_SAME(fchown) /* 95 */ ENTRY_SAME(getpriority) ENTRY_SAME(setpriority) ENTRY_SAME(recv) ENTRY_DIFF(statfs) ENTRY_DIFF(fstatfs) /* 100 */ ENTRY_SAME(ni_syscall) /* don't think hppa glibc even provides an entry pt for this * so disable for now */ ENTRY_UHOH(socketcall) ENTRY_SAME(syslog) /* even though manpage says struct timeval contains longs, ours has * time_t and suseconds_t -- both of which are safe wide/narrow */ ENTRY_SAME(setitimer) ENTRY_SAME(getitimer) /* 105 */ ENTRY_SAME(capget) ENTRY_SAME(capset) ENTRY_SAME(pread) ENTRY_SAME(pwrite) ENTRY_SAME(getcwd) /* 110 */ ENTRY_SAME(vhangup) ENTRY_SAME(ni_syscall) ENTRY_SAME(vfork_wrapper) /* struct rusage contains longs... */ ENTRY_DIFF(wait4) ENTRY_SAME(swapoff) /* 115 */ /* struct sysinfo contains longs */ ENTRY_SAME(sysinfo) ENTRY_SAME(shutdown) ENTRY_SAME(fsync) ENTRY_SAME(madvise) ENTRY_SAME(clone_wrapper) /* 120 */ ENTRY_SAME(setdomainname) ENTRY_SAME(sendfile) /* struct sockaddr... */ ENTRY_SAME(recvfrom) /* struct timex contains longs */ ENTRY_UHOH(adjtimex) ENTRY_SAME(mprotect) /* 125 */ /* old_sigset_t forced to 32 bits. Beware glibc sigset_t */ ENTRY_DIFF(sigprocmask) ENTRY_SAME(create_module) /* struct module contains longs, but insmod builds a 64 bit struct * if running under a 64 bit kernel */ ENTRY_SAME(init_module) ENTRY_SAME(delete_module) /* struct kernel_sym contains a long. Linus never heard of size_t? */ ENTRY_DIFF(get_kernel_syms) /* 130 */ ENTRY_SAME(quotactl) ENTRY_SAME(getpgid) ENTRY_SAME(fchdir) /* bdflush(func, addr) where func has least-significant-bit set means * addr is a pointer to long :-( */ ENTRY_UHOH(bdflush) ENTRY_SAME(sysfs) /* 135 */ ENTRY_SAME(personality) ENTRY_SAME(ni_syscall) /* for afs_syscall */ ENTRY_SAME(setfsuid) ENTRY_SAME(setfsgid) /* I think this might work */ ENTRY_SAME(llseek) /* 140 */ /* struct linux_dirent has longs, like 'unsigned long d_ino' which * almost definitely should be 'ino_t d_ino' but it's too late now */ ENTRY_DIFF(getdents) /* it is POSSIBLE that select will be OK because even though fd_set * contains longs, the macros and sizes are clever. */ ENTRY_SAME(select) ENTRY_SAME(flock) ENTRY_SAME(msync) /* struct iovec contains pointers */ ENTRY_UHOH(readv) /* 145 */ ENTRY_UHOH(writev) ENTRY_SAME(getsid) ENTRY_SAME(fdatasync) /* struct __sysctl_args is a mess */ ENTRY_DIFF(sysctl) ENTRY_SAME(mlock) /* 150 */ ENTRY_SAME(munlock) ENTRY_SAME(mlockall) ENTRY_SAME(munlockall) /* struct sched_param is ok for now */ ENTRY_SAME(sched_setparam) ENTRY_SAME(sched_getparam) /* 155 */ ENTRY_SAME(sched_setscheduler) ENTRY_SAME(sched_getscheduler) ENTRY_SAME(sched_yield) ENTRY_SAME(sched_get_priority_max) ENTRY_SAME(sched_get_priority_min) /* 160 */ /* These 2 would've worked if someone had defined struct timespec * carefully, like timeval for example (which is about the same). * Unfortunately it contains a long :-( */ ENTRY_DIFF(sched_rr_get_interval) ENTRY_DIFF(nanosleep) ENTRY_SAME(mremap) ENTRY_SAME(setresuid) ENTRY_SAME(getresuid) /* 165 */ /* might work, but in general signals need a thorough review */ ENTRY_UHOH(sigaltstack_wrapper) /* struct passed back to user can contain long symbol values */ ENTRY_DIFF(query_module) ENTRY_SAME(poll) /* structs contain pointers and an in_addr... */ ENTRY_UHOH(nfsservctl) ENTRY_SAME(setresgid) /* 170 */ ENTRY_SAME(getresgid) ENTRY_SAME(prctl) /* signals need a careful review */ ENTRY_SAME(rt_sigreturn_wrapper) ENTRY_DIFF(rt_sigaction) ENTRY_DIFF(rt_sigprocmask) /* 175 */ ENTRY_DIFF(rt_sigpending) ENTRY_UHOH(rt_sigtimedwait) ENTRY_UHOH(rt_sigqueueinfo) ENTRY_SAME(rt_sigsuspend_wrapper) /* not really SAME -- see the code */ ENTRY_SAME(chown) /* 180 */ /* *sockopt() might work... */ ENTRY_SAME(setsockopt) ENTRY_SAME(getsockopt) /* struct msghdr contains pointers... */ ENTRY_UHOH(sendmsg) ENTRY_UHOH(recvmsg) ENTRY_SAME(semop) /* 185 */ ENTRY_SAME(semget) /* needs a more careful review */ ENTRY_UHOH(semctl) /* struct msgbuf contains a long */ ENTRY_UHOH(msgsnd) ENTRY_UHOH(msgrcv) ENTRY_SAME(msgget) /* 190 */ /* struct msqid_ds contains pointers */ ENTRY_UHOH(msgctl) ENTRY_SAME(shmat_wrapper) ENTRY_SAME(shmdt) ENTRY_SAME(shmget) /***************/ /* struct shmid_ds contains pointers */ ENTRY_UHOH(shmctl) /* 195 */ ENTRY_SAME(ni_syscall) /* streams1 */ ENTRY_SAME(ni_syscall) /* streams2 */ .end /* Make sure nothing else is placed on this page */ .align 4096 .export end_linux_gateway_page end_linux_gateway_page: |