1/* 2 * Linux/PA-RISC Project (http://www.parisc-linux.org/) 3 * 4 * System call entry code Copyright (c) Matthew Wilcox 1999 <willy@bofh.ai> 5 * Licensed under the GNU GPL. 6 * thanks to Philipp Rumpf, Mike Shaver and various others 7 * sorry about the wall, puffin.. 8 */ 9 10#include <asm/asm-offsets.h> 11#include <asm/unistd.h> 12#include <asm/errno.h> 13#include <asm/psw.h> 14#include <asm/thread_info.h> 15#include <asm/assembly.h> 16#include <asm/processor.h> 17 18#include <linux/linkage.h> 19 20 /* We fill the empty parts of the gateway page with 21 * something that will kill the kernel or a 22 * userspace application. 23 */ 24#define KILL_INSN break 0,0 25 26 .level LEVEL 27 28 .text 29 30 .import syscall_exit,code 31 .import syscall_exit_rfi,code 32 33 /* Linux gateway page is aliased to virtual page 0 in the kernel 34 * address space. Since it is a gateway page it cannot be 35 * dereferenced, so null pointers will still fault. We start 36 * the actual entry point at 0x100. We put break instructions 37 * at the beginning of the page to trap null indirect function 38 * pointers. 39 */ 40 41 .align ASM_PAGE_SIZE 42ENTRY(linux_gateway_page) 43 44 /* ADDRESS 0x00 to 0xb0 = 176 bytes / 4 bytes per insn = 44 insns */ 45 .rept 44 46 KILL_INSN 47 .endr 48 49 /* ADDRESS 0xb0 to 0xb4, lws uses 1 insns for entry */ 50 /* Light-weight-syscall entry must always be located at 0xb0 */ 51 /* WARNING: Keep this number updated with table size changes */ 52#define __NR_lws_entries (2) 53 54lws_entry: 55 /* Unconditional branch to lws_start, located on the 56 same gateway page */ 57 b,n lws_start 58 59 /* Fill from 0xb4 to 0xe0 */ 60 .rept 11 61 KILL_INSN 62 .endr 63 64 /* This function MUST be located at 0xe0 for glibc's threading 65 mechanism to work. DO NOT MOVE THIS CODE EVER! */ 66set_thread_pointer: 67 gate .+8, %r0 /* increase privilege */ 68 depi 3, 31, 2, %r31 /* Ensure we return into user mode. */ 69 be 0(%sr7,%r31) /* return to user space */ 70 mtctl %r26, %cr27 /* move arg0 to the control register */ 71 72 /* Increase the chance of trapping if random jumps occur to this 73 address, fill from 0xf0 to 0x100 */ 74 .rept 4 75 KILL_INSN 76 .endr 77 78/* This address must remain fixed at 0x100 for glibc's syscalls to work */ 79 .align 256 80linux_gateway_entry: 81 gate .+8, %r0 /* become privileged */ 82 mtsp %r0,%sr4 /* get kernel space into sr4 */ 83 mtsp %r0,%sr5 /* get kernel space into sr5 */ 84 mtsp %r0,%sr6 /* get kernel space into sr6 */ 85 mfsp %sr7,%r1 /* save user sr7 */ 86 mtsp %r1,%sr3 /* and store it in sr3 */ 87 88#ifdef CONFIG_64BIT 89 /* for now we can *always* set the W bit on entry to the syscall 90 * since we don't support wide userland processes. We could 91 * also save the current SM other than in r0 and restore it on 92 * exit from the syscall, and also use that value to know 93 * whether to do narrow or wide syscalls. -PB 94 */ 95 ssm PSW_SM_W, %r1 96 extrd,u %r1,PSW_W_BIT,1,%r1 97 /* sp must be aligned on 4, so deposit the W bit setting into 98 * the bottom of sp temporarily */ 99 or,ev %r1,%r30,%r30 100 b,n 1f 101 /* The top halves of argument registers must be cleared on syscall 102 * entry from narrow executable. 103 */ 104 depdi 0, 31, 32, %r26 105 depdi 0, 31, 32, %r25 106 depdi 0, 31, 32, %r24 107 depdi 0, 31, 32, %r23 108 depdi 0, 31, 32, %r22 109 depdi 0, 31, 32, %r21 1101: 111#endif 112 mfctl %cr30,%r1 113 xor %r1,%r30,%r30 /* ye olde xor trick */ 114 xor %r1,%r30,%r1 115 xor %r1,%r30,%r30 116 117 ldo THREAD_SZ_ALGN+FRAME_SIZE(%r30),%r30 /* set up kernel stack */ 118 119 /* N.B.: It is critical that we don't set sr7 to 0 until r30 120 * contains a valid kernel stack pointer. It is also 121 * critical that we don't start using the kernel stack 122 * until after sr7 has been set to 0. 123 */ 124 125 mtsp %r0,%sr7 /* get kernel space into sr7 */ 126 STREGM %r1,FRAME_SIZE(%r30) /* save r1 (usp) here for now */ 127 mfctl %cr30,%r1 /* get task ptr in %r1 */ 128 LDREG TI_TASK(%r1),%r1 129 130 /* Save some registers for sigcontext and potential task 131 switch (see entry.S for the details of which ones are 132 saved/restored). TASK_PT_PSW is zeroed so we can see whether 133 a process is on a syscall or not. For an interrupt the real 134 PSW value is stored. This is needed for gdb and sys_ptrace. */ 135 STREG %r0, TASK_PT_PSW(%r1) 136 STREG %r2, TASK_PT_GR2(%r1) /* preserve rp */ 137 STREG %r19, TASK_PT_GR19(%r1) 138 139 LDREGM -FRAME_SIZE(%r30), %r2 /* get users sp back */ 140#ifdef CONFIG_64BIT 141 extrd,u %r2,63,1,%r19 /* W hidden in bottom bit */ 142#endif 143 STREG %r2, TASK_PT_GR30(%r1) /* ... and save it */ 144 145 STREG %r20, TASK_PT_GR20(%r1) /* Syscall number */ 146 STREG %r21, TASK_PT_GR21(%r1) 147 STREG %r22, TASK_PT_GR22(%r1) 148 STREG %r23, TASK_PT_GR23(%r1) /* 4th argument */ 149 STREG %r24, TASK_PT_GR24(%r1) /* 3rd argument */ 150 STREG %r25, TASK_PT_GR25(%r1) /* 2nd argument */ 151 STREG %r26, TASK_PT_GR26(%r1) /* 1st argument */ 152 STREG %r27, TASK_PT_GR27(%r1) /* user dp */ 153 STREG %r28, TASK_PT_GR28(%r1) /* return value 0 */ 154 STREG %r28, TASK_PT_ORIG_R28(%r1) /* return value 0 (saved for signals) */ 155 STREG %r29, TASK_PT_GR29(%r1) /* return value 1 */ 156 STREG %r31, TASK_PT_GR31(%r1) /* preserve syscall return ptr */ 157 158 ldo TASK_PT_FR0(%r1), %r27 /* save fpregs from the kernel */ 159 save_fp %r27 /* or potential task switch */ 160 161 mfctl %cr11, %r27 /* i.e. SAR */ 162 STREG %r27, TASK_PT_SAR(%r1) 163 164 loadgp 165 166#ifdef CONFIG_64BIT 167 ldo -16(%r30),%r29 /* Reference param save area */ 168 copy %r19,%r2 /* W bit back to r2 */ 169#else 170 /* no need to save these on stack in wide mode because the first 8 171 * args are passed in registers */ 172 stw %r22, -52(%r30) /* 5th argument */ 173 stw %r21, -56(%r30) /* 6th argument */ 174#endif 175 176 /* Are we being ptraced? */ 177 mfctl %cr30, %r1 178 LDREG TI_TASK(%r1),%r1 179 ldw TASK_PTRACE(%r1), %r1 180 bb,<,n %r1,31,.Ltracesys 181 182 /* Note! We cannot use the syscall table that is mapped 183 nearby since the gateway page is mapped execute-only. */ 184 185#ifdef CONFIG_64BIT 186 ldil L%sys_call_table, %r1 187 or,= %r2,%r2,%r2 188 addil L%(sys_call_table64-sys_call_table), %r1 189 ldo R%sys_call_table(%r1), %r19 190 or,= %r2,%r2,%r2 191 ldo R%sys_call_table64(%r1), %r19 192#else 193 ldil L%sys_call_table, %r1 194 ldo R%sys_call_table(%r1), %r19 195#endif 196 comiclr,>> __NR_Linux_syscalls, %r20, %r0 197 b,n .Lsyscall_nosys 198 199 LDREGX %r20(%r19), %r19 200 201 /* If this is a sys_rt_sigreturn call, and the signal was received 202 * when not in_syscall, then we want to return via syscall_exit_rfi, 203 * not syscall_exit. Signal no. in r20, in_syscall in r25 (see 204 * trampoline code in signal.c). 205 */ 206 ldi __NR_rt_sigreturn,%r2 207 comb,= %r2,%r20,.Lrt_sigreturn 208.Lin_syscall: 209 ldil L%syscall_exit,%r2 210 be 0(%sr7,%r19) 211 ldo R%syscall_exit(%r2),%r2 212.Lrt_sigreturn: 213 comib,<> 0,%r25,.Lin_syscall 214 ldil L%syscall_exit_rfi,%r2 215 be 0(%sr7,%r19) 216 ldo R%syscall_exit_rfi(%r2),%r2 217 218 /* Note! Because we are not running where we were linked, any 219 calls to functions external to this file must be indirect. To 220 be safe, we apply the opposite rule to functions within this 221 file, with local labels given to them to ensure correctness. */ 222 223.Lsyscall_nosys: 224syscall_nosys: 225 ldil L%syscall_exit,%r1 226 be R%syscall_exit(%sr7,%r1) 227 ldo -ENOSYS(%r0),%r28 /* set errno */ 228 229 230/* Warning! This trace code is a virtual duplicate of the code above so be 231 * sure to maintain both! */ 232.Ltracesys: 233tracesys: 234 /* Need to save more registers so the debugger can see where we 235 * are. This saves only the lower 8 bits of PSW, so that the C 236 * bit is still clear on syscalls, and the D bit is set if this 237 * full register save path has been executed. We check the D 238 * bit on syscall_return_rfi to determine which registers to 239 * restore. An interrupt results in a full PSW saved with the 240 * C bit set, a non-straced syscall entry results in C and D clear 241 * in the saved PSW. 242 */ 243 ldo -THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 /* get task ptr */ 244 LDREG TI_TASK(%r1), %r1 245 ssm 0,%r2 246 STREG %r2,TASK_PT_PSW(%r1) /* Lower 8 bits only!! */ 247 mfsp %sr0,%r2 248 STREG %r2,TASK_PT_SR0(%r1) 249 mfsp %sr1,%r2 250 STREG %r2,TASK_PT_SR1(%r1) 251 mfsp %sr2,%r2 252 STREG %r2,TASK_PT_SR2(%r1) 253 mfsp %sr3,%r2 254 STREG %r2,TASK_PT_SR3(%r1) 255 STREG %r2,TASK_PT_SR4(%r1) 256 STREG %r2,TASK_PT_SR5(%r1) 257 STREG %r2,TASK_PT_SR6(%r1) 258 STREG %r2,TASK_PT_SR7(%r1) 259 STREG %r2,TASK_PT_IASQ0(%r1) 260 STREG %r2,TASK_PT_IASQ1(%r1) 261 LDREG TASK_PT_GR31(%r1),%r2 262 STREG %r2,TASK_PT_IAOQ0(%r1) 263 ldo 4(%r2),%r2 264 STREG %r2,TASK_PT_IAOQ1(%r1) 265 ldo TASK_REGS(%r1),%r2 266 /* reg_save %r2 */ 267 STREG %r3,PT_GR3(%r2) 268 STREG %r4,PT_GR4(%r2) 269 STREG %r5,PT_GR5(%r2) 270 STREG %r6,PT_GR6(%r2) 271 STREG %r7,PT_GR7(%r2) 272 STREG %r8,PT_GR8(%r2) 273 STREG %r9,PT_GR9(%r2) 274 STREG %r10,PT_GR10(%r2) 275 STREG %r11,PT_GR11(%r2) 276 STREG %r12,PT_GR12(%r2) 277 STREG %r13,PT_GR13(%r2) 278 STREG %r14,PT_GR14(%r2) 279 STREG %r15,PT_GR15(%r2) 280 STREG %r16,PT_GR16(%r2) 281 STREG %r17,PT_GR17(%r2) 282 STREG %r18,PT_GR18(%r2) 283 /* Finished saving things for the debugger */ 284 285 ldil L%syscall_trace,%r1 286 ldil L%tracesys_next,%r2 287 be R%syscall_trace(%sr7,%r1) 288 ldo R%tracesys_next(%r2),%r2 289 290tracesys_next: 291 ldil L%sys_call_table,%r1 292 ldo R%sys_call_table(%r1), %r19 293 294 ldo -THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 /* get task ptr */ 295 LDREG TI_TASK(%r1), %r1 296 LDREG TASK_PT_GR20(%r1), %r20 297 LDREG TASK_PT_GR26(%r1), %r26 /* Restore the users args */ 298 LDREG TASK_PT_GR25(%r1), %r25 299 LDREG TASK_PT_GR24(%r1), %r24 300 LDREG TASK_PT_GR23(%r1), %r23 301#ifdef CONFIG_64BIT 302 LDREG TASK_PT_GR22(%r1), %r22 303 LDREG TASK_PT_GR21(%r1), %r21 304 ldo -16(%r30),%r29 /* Reference param save area */ 305#endif 306 307 comiclr,>>= __NR_Linux_syscalls, %r20, %r0 308 b,n .Lsyscall_nosys 309 310 LDREGX %r20(%r19), %r19 311 312 /* If this is a sys_rt_sigreturn call, and the signal was received 313 * when not in_syscall, then we want to return via syscall_exit_rfi, 314 * not syscall_exit. Signal no. in r20, in_syscall in r25 (see 315 * trampoline code in signal.c). 316 */ 317 ldi __NR_rt_sigreturn,%r2 318 comb,= %r2,%r20,.Ltrace_rt_sigreturn 319.Ltrace_in_syscall: 320 ldil L%tracesys_exit,%r2 321 be 0(%sr7,%r19) 322 ldo R%tracesys_exit(%r2),%r2 323 324 /* Do *not* call this function on the gateway page, because it 325 makes a direct call to syscall_trace. */ 326 327tracesys_exit: 328 ldo -THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 /* get task ptr */ 329 LDREG TI_TASK(%r1), %r1 330#ifdef CONFIG_64BIT 331 ldo -16(%r30),%r29 /* Reference param save area */ 332#endif 333 bl syscall_trace, %r2 334 STREG %r28,TASK_PT_GR28(%r1) /* save return value now */ 335 ldo -THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 /* get task ptr */ 336 LDREG TI_TASK(%r1), %r1 337 LDREG TASK_PT_GR28(%r1), %r28 /* Restore return val. */ 338 339 ldil L%syscall_exit,%r1 340 be,n R%syscall_exit(%sr7,%r1) 341 342.Ltrace_rt_sigreturn: 343 comib,<> 0,%r25,.Ltrace_in_syscall 344 ldil L%tracesys_sigexit,%r2 345 be 0(%sr7,%r19) 346 ldo R%tracesys_sigexit(%r2),%r2 347 348tracesys_sigexit: 349 ldo -THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 /* get task ptr */ 350 LDREG 0(%r1), %r1 351#ifdef CONFIG_64BIT 352 ldo -16(%r30),%r29 /* Reference param save area */ 353#endif 354 bl syscall_trace, %r2 355 nop 356 357 ldil L%syscall_exit_rfi,%r1 358 be,n R%syscall_exit_rfi(%sr7,%r1) 359 360 361 /********************************************************* 362 Light-weight-syscall code 363 364 r20 - lws number 365 r26,r25,r24,r23,r22 - Input registers 366 r28 - Function return register 367 r21 - Error code. 368 369 Scracth: Any of the above that aren't being 370 currently used, including r1. 371 372 Return pointer: r31 (Not usable) 373 374 Error codes returned by entry path: 375 376 ENOSYS - r20 was an invalid LWS number. 377 378 *********************************************************/ 379lws_start: 380 /* Gate and ensure we return to userspace */ 381 gate .+8, %r0 382 depi 3, 31, 2, %r31 /* Ensure we return to userspace */ 383 384#ifdef CONFIG_64BIT 385 ssm PSW_SM_W, %r1 386 extrd,u %r1,PSW_W_BIT,1,%r1 387 /* sp must be aligned on 4, so deposit the W bit setting into 388 * the bottom of sp temporarily */ 389 or,ev %r1,%r30,%r30 390 391 /* Clip LWS number to a 32-bit value always */ 392 depdi 0, 31, 32, %r20 393#endif 394 395 /* Is the lws entry number valid? */ 396 comiclr,>>= __NR_lws_entries, %r20, %r0 397 b,n lws_exit_nosys 398 399 /* WARNING: Trashing sr2 and sr3 */ 400 mfsp %sr7,%r1 /* get userspace into sr3 */ 401 mtsp %r1,%sr3 402 mtsp %r0,%sr2 /* get kernel space into sr2 */ 403 404 /* Load table start */ 405 ldil L%lws_table, %r1 406 ldo R%lws_table(%r1), %r28 /* Scratch use of r28 */ 407 LDREGX %r20(%sr2,r28), %r21 /* Scratch use of r21 */ 408 409 /* Jump to lws, lws table pointers already relocated */ 410 be,n 0(%sr2,%r21) 411 412lws_exit_nosys: 413 ldo -ENOSYS(%r0),%r21 /* set errno */ 414 /* Fall through: Return to userspace */ 415 416lws_exit: 417#ifdef CONFIG_64BIT 418 /* decide whether to reset the wide mode bit 419 * 420 * For a syscall, the W bit is stored in the lowest bit 421 * of sp. Extract it and reset W if it is zero */ 422 extrd,u,*<> %r30,63,1,%r1 423 rsm PSW_SM_W, %r0 424 /* now reset the lowest bit of sp if it was set */ 425 xor %r30,%r1,%r30 426#endif 427 be,n 0(%sr3, %r31) 428 429 430 431 /*************************************************** 432 Implementing CAS as an atomic operation: 433 434 %r26 - Address to examine 435 %r25 - Old value to check (old) 436 %r24 - New value to set (new) 437 %r28 - Return prev through this register. 438 %r21 - Kernel error code 439 440 If debugging is DISabled: 441 442 %r21 has the following meanings: 443 444 EAGAIN - CAS is busy, ldcw failed, try again. 445 EFAULT - Read or write failed. 446 447 If debugging is enabled: 448 449 EDEADLOCK - CAS called recursively. 450 EAGAIN && r28 == 1 - CAS is busy. Lock contended. 451 EAGAIN && r28 == 2 - CAS is busy. ldcw failed. 452 EFAULT - Read or write failed. 453 454 Scratch: r20, r28, r1 455 456 ****************************************************/ 457 458 /* Do not enable LWS debugging */ 459#define ENABLE_LWS_DEBUG 0 460 461 /* ELF64 Process entry path */ 462lws_compare_and_swap64: 463#ifdef CONFIG_64BIT 464 b,n lws_compare_and_swap 465#else 466 /* If we are not a 64-bit kernel, then we don't 467 * implement having 64-bit input registers 468 */ 469 b,n lws_exit_nosys 470#endif 471 472 /* ELF32 Process entry path */ 473lws_compare_and_swap32: 474#ifdef CONFIG_64BIT 475 /* Clip all the input registers */ 476 depdi 0, 31, 32, %r26 477 depdi 0, 31, 32, %r25 478 depdi 0, 31, 32, %r24 479#endif 480 481lws_compare_and_swap: 482#ifdef CONFIG_SMP 483 /* Load start of lock table */ 484 ldil L%lws_lock_start, %r20 485 ldo R%lws_lock_start(%r20), %r28 486 487 /* Extract four bits from r26 and hash lock (Bits 4-7) */ 488 extru %r26, 27, 4, %r20 489 490 /* Find lock to use, the hash is either one of 0 to 491 15, multiplied by 16 (keep it 16-byte aligned) 492 and add to the lock table offset. */ 493 shlw %r20, 4, %r20 494 add %r20, %r28, %r20 495 496# if ENABLE_LWS_DEBUG 497 /* 498 DEBUG, check for deadlock! 499 If the thread register values are the same 500 then we were the one that locked it last and 501 this is a recurisve call that will deadlock. 502 We *must* giveup this call and fail. 503 */ 504 ldw 4(%sr2,%r20), %r28 /* Load thread register */ 505 /* WARNING: If cr27 cycles to the same value we have problems */ 506 mfctl %cr27, %r21 /* Get current thread register */ 507 cmpb,<>,n %r21, %r28, cas_lock /* Called recursive? */ 508 b lws_exit /* Return error! */ 509 ldo -EDEADLOCK(%r0), %r21 510cas_lock: 511 cmpb,=,n %r0, %r28, cas_nocontend /* Is nobody using it? */ 512 ldo 1(%r0), %r28 /* 1st case */ 513 b lws_exit /* Contended... */ 514 ldo -EAGAIN(%r0), %r21 /* Spin in userspace */ 515cas_nocontend: 516# endif 517/* ENABLE_LWS_DEBUG */ 518 519 LDCW 0(%sr2,%r20), %r28 /* Try to acquire the lock */ 520 cmpb,<>,n %r0, %r28, cas_action /* Did we get it? */ 521cas_wouldblock: 522 ldo 2(%r0), %r28 /* 2nd case */ 523 b lws_exit /* Contended... */ 524 ldo -EAGAIN(%r0), %r21 /* Spin in userspace */ 525#endif 526/* CONFIG_SMP */ 527 528 /* 529 prev = *addr; 530 if ( prev == old ) 531 *addr = new; 532 return prev; 533 */ 534 535 /* NOTES: 536 This all works becuse intr_do_signal 537 and schedule both check the return iasq 538 and see that we are on the kernel page 539 so this process is never scheduled off 540 or is ever sent any signal of any sort, 541 thus it is wholly atomic from usrspaces 542 perspective 543 */ 544cas_action: 545#if defined CONFIG_SMP && ENABLE_LWS_DEBUG 546 /* DEBUG */ 547 mfctl %cr27, %r1 548 stw %r1, 4(%sr2,%r20) 549#endif 550 /* The load and store could fail */ 5511: ldw 0(%sr3,%r26), %r28 552 sub,<> %r28, %r25, %r0 5532: stw %r24, 0(%sr3,%r26) 554#ifdef CONFIG_SMP 555 /* Free lock */ 556 stw %r20, 0(%sr2,%r20) 557# if ENABLE_LWS_DEBUG 558 /* Clear thread register indicator */ 559 stw %r0, 4(%sr2,%r20) 560# endif 561#endif 562 /* Return to userspace, set no error */ 563 b lws_exit 564 copy %r0, %r21 565 5663: 567 /* Error occured on load or store */ 568#ifdef CONFIG_SMP 569 /* Free lock */ 570 stw %r20, 0(%sr2,%r20) 571# if ENABLE_LWS_DEBUG 572 stw %r0, 4(%sr2,%r20) 573# endif 574#endif 575 b lws_exit 576 ldo -EFAULT(%r0),%r21 /* set errno */ 577 nop 578 nop 579 nop 580 nop 581 582 /* Two exception table entries, one for the load, 583 the other for the store. Either return -EFAULT. 584 Each of the entries must be relocated. */ 585 .section __ex_table,"aw" 586 ASM_ULONG_INSN (1b - linux_gateway_page), (3b - linux_gateway_page) 587 ASM_ULONG_INSN (2b - linux_gateway_page), (3b - linux_gateway_page) 588 .previous 589 590 591 /* Make sure nothing else is placed on this page */ 592 .align ASM_PAGE_SIZE 593END(linux_gateway_page) 594ENTRY(end_linux_gateway_page) 595 596 /* Relocate symbols assuming linux_gateway_page is mapped 597 to virtual address 0x0 */ 598 599#define LWS_ENTRY(_name_) ASM_ULONG_INSN (lws_##_name_ - linux_gateway_page) 600 601 .section .rodata,"a" 602 603 .align ASM_PAGE_SIZE 604 /* Light-weight-syscall table */ 605 /* Start of lws table. */ 606ENTRY(lws_table) 607 LWS_ENTRY(compare_and_swap32) /* 0 - ELF32 Atomic compare and swap */ 608 LWS_ENTRY(compare_and_swap64) /* 1 - ELF64 Atomic compare and swap */ 609END(lws_table) 610 /* End of lws table */ 611 612 .align ASM_PAGE_SIZE 613ENTRY(sys_call_table) 614#include "syscall_table.S" 615END(sys_call_table) 616 617#ifdef CONFIG_64BIT 618 .align ASM_PAGE_SIZE 619ENTRY(sys_call_table64) 620#define SYSCALL_TABLE_64BIT 621#include "syscall_table.S" 622END(sys_call_table64) 623#endif 624 625#ifdef CONFIG_SMP 626 /* 627 All light-weight-syscall atomic operations 628 will use this set of locks 629 */ 630 .section .data 631 .align 4096 632ENTRY(lws_lock_start) 633 /* lws locks */ 634 .align 16 635 .rept 16 636 /* Keep locks aligned at 16-bytes */ 637 .word 1 638 .word 0 639 .word 0 640 .word 0 641 .endr 642END(lws_lock_start) 643 .previous 644#endif 645/* CONFIG_SMP for lws_lock_start */ 646 647.end 648