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/page.h> 14#include <asm/psw.h> 15#include <asm/thread_info.h> 16#include <asm/assembly.h> 17#include <asm/processor.h> 18 19#include <linux/linkage.h> 20 21 /* We fill the empty parts of the gateway page with 22 * something that will kill the kernel or a 23 * userspace application. 24 */ 25#define KILL_INSN break 0,0 26 27 .level LEVEL 28 29 .text 30 31 .import syscall_exit,code 32 .import syscall_exit_rfi,code 33 34 /* Linux gateway page is aliased to virtual page 0 in the kernel 35 * address space. Since it is a gateway page it cannot be 36 * dereferenced, so null pointers will still fault. We start 37 * the actual entry point at 0x100. We put break instructions 38 * at the beginning of the page to trap null indirect function 39 * pointers. 40 */ 41 42 .align PAGE_SIZE 43ENTRY(linux_gateway_page) 44 45 /* ADDRESS 0x00 to 0xb0 = 176 bytes / 4 bytes per insn = 44 insns */ 46 .rept 44 47 KILL_INSN 48 .endr 49 50 /* ADDRESS 0xb0 to 0xb4, lws uses 1 insns for entry */ 51 /* Light-weight-syscall entry must always be located at 0xb0 */ 52 /* WARNING: Keep this number updated with table size changes */ 53#define __NR_lws_entries (2) 54 55lws_entry: 56 /* Unconditional branch to lws_start, located on the 57 same gateway page */ 58 b,n lws_start 59 60 /* Fill from 0xb4 to 0xe0 */ 61 .rept 11 62 KILL_INSN 63 .endr 64 65 /* This function MUST be located at 0xe0 for glibc's threading 66 mechanism to work. DO NOT MOVE THIS CODE EVER! */ 67set_thread_pointer: 68 gate .+8, %r0 /* increase privilege */ 69 depi 3, 31, 2, %r31 /* Ensure we return into user mode. */ 70 be 0(%sr7,%r31) /* return to user space */ 71 mtctl %r26, %cr27 /* move arg0 to the control register */ 72 73 /* Increase the chance of trapping if random jumps occur to this 74 address, fill from 0xf0 to 0x100 */ 75 .rept 4 76 KILL_INSN 77 .endr 78 79/* This address must remain fixed at 0x100 for glibc's syscalls to work */ 80 .align 256 81linux_gateway_entry: 82 gate .+8, %r0 /* become privileged */ 83 mtsp %r0,%sr4 /* get kernel space into sr4 */ 84 mtsp %r0,%sr5 /* get kernel space into sr5 */ 85 mtsp %r0,%sr6 /* get kernel space into sr6 */ 86 mfsp %sr7,%r1 /* save user sr7 */ 87 mtsp %r1,%sr3 /* and store it in sr3 */ 88 89#ifdef CONFIG_64BIT 90 /* for now we can *always* set the W bit on entry to the syscall 91 * since we don't support wide userland processes. We could 92 * also save the current SM other than in r0 and restore it on 93 * exit from the syscall, and also use that value to know 94 * whether to do narrow or wide syscalls. -PB 95 */ 96 ssm PSW_SM_W, %r1 97 extrd,u %r1,PSW_W_BIT,1,%r1 98 /* sp must be aligned on 4, so deposit the W bit setting into 99 * the bottom of sp temporarily */ 100 or,ev %r1,%r30,%r30 101 b,n 1f 102 /* The top halves of argument registers must be cleared on syscall 103 * entry from narrow executable. 104 */ 105 depdi 0, 31, 32, %r26 106 depdi 0, 31, 32, %r25 107 depdi 0, 31, 32, %r24 108 depdi 0, 31, 32, %r23 109 depdi 0, 31, 32, %r22 110 depdi 0, 31, 32, %r21 1111: 112#endif 113 mfctl %cr30,%r1 114 xor %r1,%r30,%r30 /* ye olde xor trick */ 115 xor %r1,%r30,%r1 116 xor %r1,%r30,%r30 117 118 ldo THREAD_SZ_ALGN+FRAME_SIZE(%r30),%r30 /* set up kernel stack */ 119 120 /* N.B.: It is critical that we don't set sr7 to 0 until r30 121 * contains a valid kernel stack pointer. It is also 122 * critical that we don't start using the kernel stack 123 * until after sr7 has been set to 0. 124 */ 125 126 mtsp %r0,%sr7 /* get kernel space into sr7 */ 127 STREGM %r1,FRAME_SIZE(%r30) /* save r1 (usp) here for now */ 128 mfctl %cr30,%r1 /* get task ptr in %r1 */ 129 LDREG TI_TASK(%r1),%r1 130 131 /* Save some registers for sigcontext and potential task 132 switch (see entry.S for the details of which ones are 133 saved/restored). TASK_PT_PSW is zeroed so we can see whether 134 a process is on a syscall or not. For an interrupt the real 135 PSW value is stored. This is needed for gdb and sys_ptrace. */ 136 STREG %r0, TASK_PT_PSW(%r1) 137 STREG %r2, TASK_PT_GR2(%r1) /* preserve rp */ 138 STREG %r19, TASK_PT_GR19(%r1) 139 140 LDREGM -FRAME_SIZE(%r30), %r2 /* get users sp back */ 141#ifdef CONFIG_64BIT 142 extrd,u %r2,63,1,%r19 /* W hidden in bottom bit */ 143#if 0 144 xor %r19,%r2,%r2 /* clear bottom bit */ 145 depd,z %r19,1,1,%r19 146 std %r19,TASK_PT_PSW(%r1) 147#endif 148#endif 149 STREG %r2, TASK_PT_GR30(%r1) /* ... and save it */ 150 151 STREG %r20, TASK_PT_GR20(%r1) /* Syscall number */ 152 STREG %r21, TASK_PT_GR21(%r1) 153 STREG %r22, TASK_PT_GR22(%r1) 154 STREG %r23, TASK_PT_GR23(%r1) /* 4th argument */ 155 STREG %r24, TASK_PT_GR24(%r1) /* 3rd argument */ 156 STREG %r25, TASK_PT_GR25(%r1) /* 2nd argument */ 157 STREG %r26, TASK_PT_GR26(%r1) /* 1st argument */ 158 STREG %r27, TASK_PT_GR27(%r1) /* user dp */ 159 STREG %r28, TASK_PT_GR28(%r1) /* return value 0 */ 160 STREG %r28, TASK_PT_ORIG_R28(%r1) /* return value 0 (saved for signals) */ 161 STREG %r29, TASK_PT_GR29(%r1) /* return value 1 */ 162 STREG %r31, TASK_PT_GR31(%r1) /* preserve syscall return ptr */ 163 164 ldo TASK_PT_FR0(%r1), %r27 /* save fpregs from the kernel */ 165 save_fp %r27 /* or potential task switch */ 166 167 mfctl %cr11, %r27 /* i.e. SAR */ 168 STREG %r27, TASK_PT_SAR(%r1) 169 170 loadgp 171 172#ifdef CONFIG_64BIT 173 ldo -16(%r30),%r29 /* Reference param save area */ 174 copy %r19,%r2 /* W bit back to r2 */ 175#else 176 /* no need to save these on stack in wide mode because the first 8 177 * args are passed in registers */ 178 stw %r22, -52(%r30) /* 5th argument */ 179 stw %r21, -56(%r30) /* 6th argument */ 180#endif 181 182 /* Are we being ptraced? */ 183 mfctl %cr30, %r1 184 LDREG TI_TASK(%r1),%r1 185 ldw TASK_PTRACE(%r1), %r1 186 bb,<,n %r1,31,.Ltracesys 187 188 /* Note! We cannot use the syscall table that is mapped 189 nearby since the gateway page is mapped execute-only. */ 190 191#ifdef CONFIG_64BIT 192 ldil L%sys_call_table, %r1 193 or,= %r2,%r2,%r2 194 addil L%(sys_call_table64-sys_call_table), %r1 195 ldo R%sys_call_table(%r1), %r19 196 or,= %r2,%r2,%r2 197 ldo R%sys_call_table64(%r1), %r19 198#else 199 ldil L%sys_call_table, %r1 200 ldo R%sys_call_table(%r1), %r19 201#endif 202 comiclr,>> __NR_Linux_syscalls, %r20, %r0 203 b,n .Lsyscall_nosys 204 205 LDREGX %r20(%r19), %r19 206 207 /* If this is a sys_rt_sigreturn call, and the signal was received 208 * when not in_syscall, then we want to return via syscall_exit_rfi, 209 * not syscall_exit. Signal no. in r20, in_syscall in r25 (see 210 * trampoline code in signal.c). 211 */ 212 ldi __NR_rt_sigreturn,%r2 213 comb,= %r2,%r20,.Lrt_sigreturn 214.Lin_syscall: 215 ldil L%syscall_exit,%r2 216 be 0(%sr7,%r19) 217 ldo R%syscall_exit(%r2),%r2 218.Lrt_sigreturn: 219 comib,<> 0,%r25,.Lin_syscall 220 ldil L%syscall_exit_rfi,%r2 221 be 0(%sr7,%r19) 222 ldo R%syscall_exit_rfi(%r2),%r2 223 224 /* Note! Because we are not running where we were linked, any 225 calls to functions external to this file must be indirect. To 226 be safe, we apply the opposite rule to functions within this 227 file, with local labels given to them to ensure correctness. */ 228 229.Lsyscall_nosys: 230syscall_nosys: 231 ldil L%syscall_exit,%r1 232 be R%syscall_exit(%sr7,%r1) 233 ldo -ENOSYS(%r0),%r28 /* set errno */ 234 235 236/* Warning! This trace code is a virtual duplicate of the code above so be 237 * sure to maintain both! */ 238.Ltracesys: 239tracesys: 240 /* Need to save more registers so the debugger can see where we 241 * are. This saves only the lower 8 bits of PSW, so that the C 242 * bit is still clear on syscalls, and the D bit is set if this 243 * full register save path has been executed. We check the D 244 * bit on syscall_return_rfi to determine which registers to 245 * restore. An interrupt results in a full PSW saved with the 246 * C bit set, a non-straced syscall entry results in C and D clear 247 * in the saved PSW. 248 */ 249 ldo -THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 /* get task ptr */ 250 LDREG TI_TASK(%r1), %r1 251 ssm 0,%r2 252 STREG %r2,TASK_PT_PSW(%r1) /* Lower 8 bits only!! */ 253 mfsp %sr0,%r2 254 STREG %r2,TASK_PT_SR0(%r1) 255 mfsp %sr1,%r2 256 STREG %r2,TASK_PT_SR1(%r1) 257 mfsp %sr2,%r2 258 STREG %r2,TASK_PT_SR2(%r1) 259 mfsp %sr3,%r2 260 STREG %r2,TASK_PT_SR3(%r1) 261 STREG %r2,TASK_PT_SR4(%r1) 262 STREG %r2,TASK_PT_SR5(%r1) 263 STREG %r2,TASK_PT_SR6(%r1) 264 STREG %r2,TASK_PT_SR7(%r1) 265 STREG %r2,TASK_PT_IASQ0(%r1) 266 STREG %r2,TASK_PT_IASQ1(%r1) 267 LDREG TASK_PT_GR31(%r1),%r2 268 STREG %r2,TASK_PT_IAOQ0(%r1) 269 ldo 4(%r2),%r2 270 STREG %r2,TASK_PT_IAOQ1(%r1) 271 ldo TASK_REGS(%r1),%r2 272 /* reg_save %r2 */ 273 STREG %r3,PT_GR3(%r2) 274 STREG %r4,PT_GR4(%r2) 275 STREG %r5,PT_GR5(%r2) 276 STREG %r6,PT_GR6(%r2) 277 STREG %r7,PT_GR7(%r2) 278 STREG %r8,PT_GR8(%r2) 279 STREG %r9,PT_GR9(%r2) 280 STREG %r10,PT_GR10(%r2) 281 STREG %r11,PT_GR11(%r2) 282 STREG %r12,PT_GR12(%r2) 283 STREG %r13,PT_GR13(%r2) 284 STREG %r14,PT_GR14(%r2) 285 STREG %r15,PT_GR15(%r2) 286 STREG %r16,PT_GR16(%r2) 287 STREG %r17,PT_GR17(%r2) 288 STREG %r18,PT_GR18(%r2) 289 /* Finished saving things for the debugger */ 290 291 ldil L%syscall_trace,%r1 292 ldil L%tracesys_next,%r2 293 be R%syscall_trace(%sr7,%r1) 294 ldo R%tracesys_next(%r2),%r2 295 296tracesys_next: 297 ldil L%sys_call_table,%r1 298 ldo R%sys_call_table(%r1), %r19 299 300 ldo -THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 /* get task ptr */ 301 LDREG TI_TASK(%r1), %r1 302 LDREG TASK_PT_GR20(%r1), %r20 303 LDREG TASK_PT_GR26(%r1), %r26 /* Restore the users args */ 304 LDREG TASK_PT_GR25(%r1), %r25 305 LDREG TASK_PT_GR24(%r1), %r24 306 LDREG TASK_PT_GR23(%r1), %r23 307#ifdef CONFIG_64BIT 308 LDREG TASK_PT_GR22(%r1), %r22 309 LDREG TASK_PT_GR21(%r1), %r21 310 ldo -16(%r30),%r29 /* Reference param save area */ 311#endif 312 313 comiclr,>>= __NR_Linux_syscalls, %r20, %r0 314 b,n .Lsyscall_nosys 315 316 LDREGX %r20(%r19), %r19 317 318 /* If this is a sys_rt_sigreturn call, and the signal was received 319 * when not in_syscall, then we want to return via syscall_exit_rfi, 320 * not syscall_exit. Signal no. in r20, in_syscall in r25 (see 321 * trampoline code in signal.c). 322 */ 323 ldi __NR_rt_sigreturn,%r2 324 comb,= %r2,%r20,.Ltrace_rt_sigreturn 325.Ltrace_in_syscall: 326 ldil L%tracesys_exit,%r2 327 be 0(%sr7,%r19) 328 ldo R%tracesys_exit(%r2),%r2 329 330 /* Do *not* call this function on the gateway page, because it 331 makes a direct call to syscall_trace. */ 332 333tracesys_exit: 334 ldo -THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 /* get task ptr */ 335 LDREG TI_TASK(%r1), %r1 336#ifdef CONFIG_64BIT 337 ldo -16(%r30),%r29 /* Reference param save area */ 338#endif 339 bl syscall_trace, %r2 340 STREG %r28,TASK_PT_GR28(%r1) /* save return value now */ 341 ldo -THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 /* get task ptr */ 342 LDREG TI_TASK(%r1), %r1 343 LDREG TASK_PT_GR28(%r1), %r28 /* Restore return val. */ 344 345 ldil L%syscall_exit,%r1 346 be,n R%syscall_exit(%sr7,%r1) 347 348.Ltrace_rt_sigreturn: 349 comib,<> 0,%r25,.Ltrace_in_syscall 350 ldil L%tracesys_sigexit,%r2 351 be 0(%sr7,%r19) 352 ldo R%tracesys_sigexit(%r2),%r2 353 354tracesys_sigexit: 355 ldo -THREAD_SZ_ALGN-FRAME_SIZE(%r30),%r1 /* get task ptr */ 356 LDREG 0(%r1), %r1 357#ifdef CONFIG_64BIT 358 ldo -16(%r30),%r29 /* Reference param save area */ 359#endif 360 bl syscall_trace, %r2 361 nop 362 363 ldil L%syscall_exit_rfi,%r1 364 be,n R%syscall_exit_rfi(%sr7,%r1) 365 366 367 /********************************************************* 368 Light-weight-syscall code 369 370 r20 - lws number 371 r26,r25,r24,r23,r22 - Input registers 372 r28 - Function return register 373 r21 - Error code. 374 375 Scracth: Any of the above that aren't being 376 currently used, including r1. 377 378 Return pointer: r31 (Not usable) 379 380 Error codes returned by entry path: 381 382 ENOSYS - r20 was an invalid LWS number. 383 384 *********************************************************/ 385lws_start: 386 /* Gate and ensure we return to userspace */ 387 gate .+8, %r0 388 depi 3, 31, 2, %r31 /* Ensure we return to userspace */ 389 390#ifdef CONFIG_64BIT 391 /* FIXME: If we are a 64-bit kernel just 392 * turn this on unconditionally. 393 */ 394 ssm PSW_SM_W, %r1 395 extrd,u %r1,PSW_W_BIT,1,%r1 396 /* sp must be aligned on 4, so deposit the W bit setting into 397 * the bottom of sp temporarily */ 398 or,ev %r1,%r30,%r30 399 400 /* Clip LWS number to a 32-bit value always */ 401 depdi 0, 31, 32, %r20 402#endif 403 404 /* Is the lws entry number valid? */ 405 comiclr,>>= __NR_lws_entries, %r20, %r0 406 b,n lws_exit_nosys 407 408 /* WARNING: Trashing sr2 and sr3 */ 409 mfsp %sr7,%r1 /* get userspace into sr3 */ 410 mtsp %r1,%sr3 411 mtsp %r0,%sr2 /* get kernel space into sr2 */ 412 413 /* Load table start */ 414 ldil L%lws_table, %r1 415 ldo R%lws_table(%r1), %r28 /* Scratch use of r28 */ 416 LDREGX %r20(%sr2,r28), %r21 /* Scratch use of r21 */ 417 418 /* Jump to lws, lws table pointers already relocated */ 419 be,n 0(%sr2,%r21) 420 421lws_exit_nosys: 422 ldo -ENOSYS(%r0),%r21 /* set errno */ 423 /* Fall through: Return to userspace */ 424 425lws_exit: 426#ifdef CONFIG_64BIT 427 /* decide whether to reset the wide mode bit 428 * 429 * For a syscall, the W bit is stored in the lowest bit 430 * of sp. Extract it and reset W if it is zero */ 431 extrd,u,*<> %r30,63,1,%r1 432 rsm PSW_SM_W, %r0 433 /* now reset the lowest bit of sp if it was set */ 434 xor %r30,%r1,%r30 435#endif 436 be,n 0(%sr3, %r31) 437 438 439 440 /*************************************************** 441 Implementing CAS as an atomic operation: 442 443 %r26 - Address to examine 444 %r25 - Old value to check (old) 445 %r24 - New value to set (new) 446 %r28 - Return prev through this register. 447 %r21 - Kernel error code 448 449 If debugging is DISabled: 450 451 %r21 has the following meanings: 452 453 EAGAIN - CAS is busy, ldcw failed, try again. 454 EFAULT - Read or write failed. 455 456 If debugging is enabled: 457 458 EDEADLOCK - CAS called recursively. 459 EAGAIN && r28 == 1 - CAS is busy. Lock contended. 460 EAGAIN && r28 == 2 - CAS is busy. ldcw failed. 461 EFAULT - Read or write failed. 462 463 Scratch: r20, r28, r1 464 465 ****************************************************/ 466 467 /* Do not enable LWS debugging */ 468#define ENABLE_LWS_DEBUG 0 469 470 /* ELF64 Process entry path */ 471lws_compare_and_swap64: 472#ifdef CONFIG_64BIT 473 b,n lws_compare_and_swap 474#else 475 /* If we are not a 64-bit kernel, then we don't 476 * implement having 64-bit input registers 477 */ 478 b,n lws_exit_nosys 479#endif 480 481 /* ELF32 Process entry path */ 482lws_compare_and_swap32: 483#ifdef CONFIG_64BIT 484 /* Clip all the input registers */ 485 depdi 0, 31, 32, %r26 486 depdi 0, 31, 32, %r25 487 depdi 0, 31, 32, %r24 488#endif 489 490lws_compare_and_swap: 491#ifdef CONFIG_SMP 492 /* Load start of lock table */ 493 ldil L%lws_lock_start, %r20 494 ldo R%lws_lock_start(%r20), %r28 495 496 /* Extract four bits from r26 and hash lock (Bits 4-7) */ 497 extru %r26, 27, 4, %r20 498 499 /* Find lock to use, the hash is either one of 0 to 500 15, multiplied by 16 (keep it 16-byte aligned) 501 and add to the lock table offset. */ 502 shlw %r20, 4, %r20 503 add %r20, %r28, %r20 504 505# if ENABLE_LWS_DEBUG 506 /* 507 DEBUG, check for deadlock! 508 If the thread register values are the same 509 then we were the one that locked it last and 510 this is a recurisve call that will deadlock. 511 We *must* giveup this call and fail. 512 */ 513 ldw 4(%sr2,%r20), %r28 /* Load thread register */ 514 /* WARNING: If cr27 cycles to the same value we have problems */ 515 mfctl %cr27, %r21 /* Get current thread register */ 516 cmpb,<>,n %r21, %r28, cas_lock /* Called recursive? */ 517 b lws_exit /* Return error! */ 518 ldo -EDEADLOCK(%r0), %r21 519cas_lock: 520 cmpb,=,n %r0, %r28, cas_nocontend /* Is nobody using it? */ 521 ldo 1(%r0), %r28 /* 1st case */ 522 b lws_exit /* Contended... */ 523 ldo -EAGAIN(%r0), %r21 /* Spin in userspace */ 524cas_nocontend: 525# endif 526/* ENABLE_LWS_DEBUG */ 527 528 LDCW 0(%sr2,%r20), %r28 /* Try to acquire the lock */ 529 cmpb,<>,n %r0, %r28, cas_action /* Did we get it? */ 530cas_wouldblock: 531 ldo 2(%r0), %r28 /* 2nd case */ 532 b lws_exit /* Contended... */ 533 ldo -EAGAIN(%r0), %r21 /* Spin in userspace */ 534#endif 535/* CONFIG_SMP */ 536 537 /* 538 prev = *addr; 539 if ( prev == old ) 540 *addr = new; 541 return prev; 542 */ 543 544 /* NOTES: 545 This all works becuse intr_do_signal 546 and schedule both check the return iasq 547 and see that we are on the kernel page 548 so this process is never scheduled off 549 or is ever sent any signal of any sort, 550 thus it is wholly atomic from usrspaces 551 perspective 552 */ 553cas_action: 554#if defined CONFIG_SMP && ENABLE_LWS_DEBUG 555 /* DEBUG */ 556 mfctl %cr27, %r1 557 stw %r1, 4(%sr2,%r20) 558#endif 559 /* The load and store could fail */ 5601: ldw 0(%sr3,%r26), %r28 561 sub,<> %r28, %r25, %r0 5622: stw %r24, 0(%sr3,%r26) 563#ifdef CONFIG_SMP 564 /* Free lock */ 565 stw %r20, 0(%sr2,%r20) 566# if ENABLE_LWS_DEBUG 567 /* Clear thread register indicator */ 568 stw %r0, 4(%sr2,%r20) 569# endif 570#endif 571 /* Return to userspace, set no error */ 572 b lws_exit 573 copy %r0, %r21 574 5753: 576 /* Error occured on load or store */ 577#ifdef CONFIG_SMP 578 /* Free lock */ 579 stw %r20, 0(%sr2,%r20) 580# if ENABLE_LWS_DEBUG 581 stw %r0, 4(%sr2,%r20) 582# endif 583#endif 584 b lws_exit 585 ldo -EFAULT(%r0),%r21 /* set errno */ 586 nop 587 nop 588 nop 589 nop 590 591 /* Two exception table entries, one for the load, 592 the other for the store. Either return -EFAULT. 593 Each of the entries must be relocated. */ 594 .section __ex_table,"aw" 595 ASM_ULONG_INSN (1b - linux_gateway_page), (3b - linux_gateway_page) 596 ASM_ULONG_INSN (2b - linux_gateway_page), (3b - linux_gateway_page) 597 .previous 598 599 600 /* Make sure nothing else is placed on this page */ 601 .align PAGE_SIZE 602END(linux_gateway_page) 603ENTRY(end_linux_gateway_page) 604 605 /* Relocate symbols assuming linux_gateway_page is mapped 606 to virtual address 0x0 */ 607 608#define LWS_ENTRY(_name_) ASM_ULONG_INSN (lws_##_name_ - linux_gateway_page) 609 610 .section .rodata,"a" 611 612 .align PAGE_SIZE 613 /* Light-weight-syscall table */ 614 /* Start of lws table. */ 615ENTRY(lws_table) 616 LWS_ENTRY(compare_and_swap32) /* 0 - ELF32 Atomic compare and swap */ 617 LWS_ENTRY(compare_and_swap64) /* 1 - ELF64 Atomic compare and swap */ 618END(lws_table) 619 /* End of lws table */ 620 621 .align PAGE_SIZE 622ENTRY(sys_call_table) 623#include "syscall_table.S" 624END(sys_call_table) 625 626#ifdef CONFIG_64BIT 627 .align PAGE_SIZE 628ENTRY(sys_call_table64) 629#define SYSCALL_TABLE_64BIT 630#include "syscall_table.S" 631END(sys_call_table64) 632#endif 633 634#ifdef CONFIG_SMP 635 /* 636 All light-weight-syscall atomic operations 637 will use this set of locks 638 */ 639 .section .data 640 .align PAGE_SIZE 641ENTRY(lws_lock_start) 642 /* lws locks */ 643 .align 16 644 .rept 16 645 /* Keep locks aligned at 16-bytes */ 646 .word 1 647 .word 0 648 .word 0 649 .word 0 650 .endr 651END(lws_lock_start) 652 .previous 653#endif 654/* CONFIG_SMP for lws_lock_start */ 655 656.end 657 658 659