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   1 /* entry.S: FR-V entry
   2  *
   3  * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  *
  11  *
  12  * Entry to the kernel is "interesting":
  13  *  (1) There are no stack pointers, not even for the kernel
  14  *  (2) General Registers should not be clobbered
  15  *  (3) There are no kernel-only data registers
  16  *  (4) Since all addressing modes are wrt to a General Register, no global
  17  *      variables can be reached
  18  *
  19  * We deal with this by declaring that we shall kill GR28 on entering the
  20  * kernel from userspace
  21  *
  22  * However, since break interrupts can interrupt the CPU even when PSR.ET==0,
  23  * they can't rely on GR28 to be anything useful, and so need to clobber a
  24  * separate register (GR31). Break interrupts are managed in break.S
  25  *
  26  * GR29 _is_ saved, and holds the current task pointer globally
  27  *
  28  */
  29
  30 #include <linux/linkage.h>
  31 #include <asm/thread_info.h>
  32 #include <asm/setup.h>
  33 #include <asm/segment.h>
  34 #include <asm/ptrace.h>
  35 #include <asm/errno.h>
  36 #include <asm/cache.h>
  37 #include <asm/spr-regs.h>
  38
  39 #define nr_syscalls ((syscall_table_size)/4)
  40
  41         .section        .text.entry
  42         .balign         4
  43
  44 .macro LEDS val
  45 #       sethi.p         %hi(0xe1200004),gr30
  46 #       setlo           %lo(0xe1200004),gr30
  47 #       setlos          #~\val,gr31
  48 #       st              gr31,@(gr30,gr0)
  49 #       sethi.p         %hi(0xffc00100),gr30
  50 #       setlo           %lo(0xffc00100),gr30
  51 #       sth             gr0,@(gr30,gr0)
  52 #       membar
  53 .endm
  54
  55 .macro LEDS32
  56 #       not             gr31,gr31
  57 #       sethi.p         %hi(0xe1200004),gr30
  58 #       setlo           %lo(0xe1200004),gr30
  59 #       st.p            gr31,@(gr30,gr0)
  60 #       srli            gr31,#16,gr31
  61 #       sethi.p         %hi(0xffc00100),gr30
  62 #       setlo           %lo(0xffc00100),gr30
  63 #       sth             gr31,@(gr30,gr0)
  64 #       membar
  65 .endm
  66
  67 ###############################################################################
  68 #
  69 # entry point for External interrupts received whilst executing userspace code
  70 #
  71 ###############################################################################
  72         .globl          __entry_uspace_external_interrupt
  73         .type           __entry_uspace_external_interrupt,@function
  74 __entry_uspace_external_interrupt:
  75         LEDS            0x6200
  76         sethi.p         %hi(__kernel_frame0_ptr),gr28
  77         setlo           %lo(__kernel_frame0_ptr),gr28
  78         ldi             @(gr28,#0),gr28
  79
  80         # handle h/w single-step through exceptions
  81         sti             gr0,@(gr28,#REG__STATUS)
  82
  83         .globl          __entry_uspace_external_interrupt_reentry
  84 __entry_uspace_external_interrupt_reentry:
  85         LEDS            0x6201
  86
  87         setlos          #REG__END,gr30
  88         dcpl            gr28,gr30,#0
  89
  90         # finish building the exception frame
  91         sti             sp,  @(gr28,#REG_SP)
  92         stdi            gr2, @(gr28,#REG_GR(2))
  93         stdi            gr4, @(gr28,#REG_GR(4))
  94         stdi            gr6, @(gr28,#REG_GR(6))
  95         stdi            gr8, @(gr28,#REG_GR(8))
  96         stdi            gr10,@(gr28,#REG_GR(10))
  97         stdi            gr12,@(gr28,#REG_GR(12))
  98         stdi            gr14,@(gr28,#REG_GR(14))
  99         stdi            gr16,@(gr28,#REG_GR(16))
 100         stdi            gr18,@(gr28,#REG_GR(18))
 101         stdi            gr20,@(gr28,#REG_GR(20))
 102         stdi            gr22,@(gr28,#REG_GR(22))
 103         stdi            gr24,@(gr28,#REG_GR(24))
 104         stdi            gr26,@(gr28,#REG_GR(26))
 105         sti             gr0, @(gr28,#REG_GR(28))
 106         sti             gr29,@(gr28,#REG_GR(29))
 107         stdi.p          gr30,@(gr28,#REG_GR(30))
 108
 109         # set up the kernel stack pointer
 110         ori             gr28,0,sp
 111
 112         movsg           tbr ,gr20
 113         movsg           psr ,gr22
 114         movsg           pcsr,gr21
 115         movsg           isr ,gr23
 116         movsg           ccr ,gr24
 117         movsg           cccr,gr25
 118         movsg           lr  ,gr26
 119         movsg           lcr ,gr27
 120
 121         setlos.p        #-1,gr4
 122         andi            gr22,#PSR_PS,gr5                /* try to rebuild original PSR value */
 123         andi.p          gr22,#~(PSR_PS|PSR_S),gr6
 124         slli            gr5,#1,gr5
 125         or              gr6,gr5,gr5
 126         andi            gr5,#~PSR_ET,gr5
 127
 128         sti             gr20,@(gr28,#REG_TBR)
 129         sti             gr21,@(gr28,#REG_PC)
 130         sti             gr5 ,@(gr28,#REG_PSR)
 131         sti             gr23,@(gr28,#REG_ISR)
 132         stdi            gr24,@(gr28,#REG_CCR)
 133         stdi            gr26,@(gr28,#REG_LR)
 134         sti             gr4 ,@(gr28,#REG_SYSCALLNO)
 135
 136         movsg           iacc0h,gr4
 137         movsg           iacc0l,gr5
 138         stdi            gr4,@(gr28,#REG_IACC0)
 139
 140         movsg           gner0,gr4
 141         movsg           gner1,gr5
 142         stdi.p          gr4,@(gr28,#REG_GNER0)
 143
 144         # interrupts start off fully disabled in the interrupt handler
 145         subcc           gr0,gr0,gr0,icc2                /* set Z and clear C */
 146
 147         # set up kernel global registers
 148         sethi.p         %hi(__kernel_current_task),gr5
 149         setlo           %lo(__kernel_current_task),gr5
 150         sethi.p         %hi(_gp),gr16
 151         setlo           %lo(_gp),gr16
 152         ldi             @(gr5,#0),gr29
 153         ldi.p           @(gr29,#4),gr15         ; __current_thread_info = current->thread_info
 154
 155         # make sure we (the kernel) get div-zero and misalignment exceptions
 156         setlos          #ISR_EDE|ISR_DTT_DIVBYZERO|ISR_EMAM_EXCEPTION,gr5
 157         movgs           gr5,isr
 158
 159         # switch to the kernel trap table
 160         sethi.p         %hi(__entry_kerneltrap_table),gr6
 161         setlo           %lo(__entry_kerneltrap_table),gr6
 162         movgs           gr6,tbr
 163
 164         # set the return address
 165         sethi.p         %hi(__entry_return_from_user_interrupt),gr4
 166         setlo           %lo(__entry_return_from_user_interrupt),gr4
 167         movgs           gr4,lr
 168
 169         # raise the minimum interrupt priority to 15 (NMI only) and enable exceptions
 170         movsg           psr,gr4
 171
 172         ori             gr4,#PSR_PIL_14,gr4
 173         movgs           gr4,psr
 174         ori             gr4,#PSR_PIL_14|PSR_ET,gr4
 175         movgs           gr4,psr
 176
 177         LEDS            0x6202
 178         bra             do_IRQ
 179
 180         .size           __entry_uspace_external_interrupt,.-__entry_uspace_external_interrupt
 181
 182 ###############################################################################
 183 #
 184 # entry point for External interrupts received whilst executing kernel code
 185 # - on arriving here, the following registers should already be set up:
 186 #       GR15    - current thread_info struct pointer
 187 #       GR16    - kernel GP-REL pointer
 188 #       GR29    - current task struct pointer
 189 #       TBR     - kernel trap vector table
 190 #       ISR     - kernel's preferred integer controls
 191 #
 192 ###############################################################################
 193         .globl          __entry_kernel_external_interrupt
 194         .type           __entry_kernel_external_interrupt,@function
 195 __entry_kernel_external_interrupt:
 196         LEDS            0x6210
 197 //      sub             sp,gr15,gr31
 198 //      LEDS32
 199
 200         # set up the stack pointer
 201         or.p            sp,gr0,gr30
 202         subi            sp,#REG__END,sp
 203         sti             gr30,@(sp,#REG_SP)
 204
 205         # handle h/w single-step through exceptions
 206         sti             gr0,@(sp,#REG__STATUS)
 207
 208         .globl          __entry_kernel_external_interrupt_reentry
 209 __entry_kernel_external_interrupt_reentry:
 210         LEDS            0x6211
 211
 212         # set up the exception frame
 213         setlos          #REG__END,gr30
 214         dcpl            sp,gr30,#0
 215
 216         sti.p           gr28,@(sp,#REG_GR(28))
 217         ori             sp,0,gr28
 218
 219         # finish building the exception frame
 220         stdi            gr2,@(gr28,#REG_GR(2))
 221         stdi            gr4,@(gr28,#REG_GR(4))
 222         stdi            gr6,@(gr28,#REG_GR(6))
 223         stdi            gr8,@(gr28,#REG_GR(8))
 224         stdi            gr10,@(gr28,#REG_GR(10))
 225         stdi            gr12,@(gr28,#REG_GR(12))
 226         stdi            gr14,@(gr28,#REG_GR(14))
 227         stdi            gr16,@(gr28,#REG_GR(16))
 228         stdi            gr18,@(gr28,#REG_GR(18))
 229         stdi            gr20,@(gr28,#REG_GR(20))
 230         stdi            gr22,@(gr28,#REG_GR(22))
 231         stdi            gr24,@(gr28,#REG_GR(24))
 232         stdi            gr26,@(gr28,#REG_GR(26))
 233         sti             gr29,@(gr28,#REG_GR(29))
 234         stdi.p          gr30,@(gr28,#REG_GR(30))
 235
 236         # note virtual interrupts will be fully enabled upon return
 237         subicc          gr0,#1,gr0,icc2                 /* clear Z, set C */
 238
 239         movsg           tbr ,gr20
 240         movsg           psr ,gr22
 241         movsg           pcsr,gr21
 242         movsg           isr ,gr23
 243         movsg           ccr ,gr24
 244         movsg           cccr,gr25
 245         movsg           lr  ,gr26
 246         movsg           lcr ,gr27
 247
 248         setlos.p        #-1,gr4
 249         andi            gr22,#PSR_PS,gr5                /* try to rebuild original PSR value */
 250         andi.p          gr22,#~(PSR_PS|PSR_S),gr6
 251         slli            gr5,#1,gr5
 252         or              gr6,gr5,gr5
 253         andi.p          gr5,#~PSR_ET,gr5
 254
 255         # set CCCR.CC3 to Undefined to abort atomic-modify completion inside the kernel
 256         # - for an explanation of how it works, see: Documentation/frv/atomic-ops.txt
 257         andi            gr25,#~0xc0,gr25
 258
 259         sti             gr20,@(gr28,#REG_TBR)
 260         sti             gr21,@(gr28,#REG_PC)
 261         sti             gr5 ,@(gr28,#REG_PSR)
 262         sti             gr23,@(gr28,#REG_ISR)
 263         stdi            gr24,@(gr28,#REG_CCR)
 264         stdi            gr26,@(gr28,#REG_LR)
 265         sti             gr4 ,@(gr28,#REG_SYSCALLNO)
 266
 267         movsg           iacc0h,gr4
 268         movsg           iacc0l,gr5
 269         stdi            gr4,@(gr28,#REG_IACC0)
 270
 271         movsg           gner0,gr4
 272         movsg           gner1,gr5
 273         stdi.p          gr4,@(gr28,#REG_GNER0)
 274
 275         # interrupts start off fully disabled in the interrupt handler
 276         subcc           gr0,gr0,gr0,icc2                        /* set Z and clear C */
 277
 278         # set the return address
 279         sethi.p         %hi(__entry_return_from_kernel_interrupt),gr4
 280         setlo           %lo(__entry_return_from_kernel_interrupt),gr4
 281         movgs           gr4,lr
 282
 283         # clear power-saving mode flags
 284         movsg           hsr0,gr4
 285         andi            gr4,#~HSR0_PDM,gr4
 286         movgs           gr4,hsr0
 287
 288         # raise the minimum interrupt priority to 15 (NMI only) and enable exceptions
 289         movsg           psr,gr4
 290         ori             gr4,#PSR_PIL_14,gr4
 291         movgs           gr4,psr
 292         ori             gr4,#PSR_ET,gr4
 293         movgs           gr4,psr
 294
 295         LEDS            0x6212
 296         bra             do_IRQ
 297
 298         .size           __entry_kernel_external_interrupt,.-__entry_kernel_external_interrupt
 299
 300 ###############################################################################
 301 #
 302 # deal with interrupts that were actually virtually disabled
 303 # - we need to really disable them, flag the fact and return immediately
 304 # - if you change this, you must alter break.S also
 305 #
 306 ###############################################################################
 307         .balign         L1_CACHE_BYTES
 308         .globl          __entry_kernel_external_interrupt_virtually_disabled
 309         .type           __entry_kernel_external_interrupt_virtually_disabled,@function
 310 __entry_kernel_external_interrupt_virtually_disabled:
 311         movsg           psr,gr30
 312         andi            gr30,#~PSR_PIL,gr30
 313         ori             gr30,#PSR_PIL_14,gr30           ; debugging interrupts only
 314         movgs           gr30,psr
 315         subcc           gr0,gr0,gr0,icc2                ; leave Z set, clear C
 316         rett            #0
 317
 318         .size           __entry_kernel_external_interrupt_virtually_disabled,.-__entry_kernel_external_interrupt_virtually_disabled
 319
 320 ###############################################################################
 321 #
 322 # deal with re-enablement of interrupts that were pending when virtually re-enabled
 323 # - set ICC2.C, re-enable the real interrupts and return
 324 # - we can clear ICC2.Z because we shouldn't be here if it's not 0 [due to TIHI]
 325 # - if you change this, you must alter break.S also
 326 #
 327 ###############################################################################
 328         .balign         L1_CACHE_BYTES
 329         .globl          __entry_kernel_external_interrupt_virtual_reenable
 330         .type           __entry_kernel_external_interrupt_virtual_reenable,@function
 331 __entry_kernel_external_interrupt_virtual_reenable:
 332         movsg           psr,gr30
 333         andi            gr30,#~PSR_PIL,gr30             ; re-enable interrupts
 334         movgs           gr30,psr
 335         subicc          gr0,#1,gr0,icc2                 ; clear Z, set C
 336         rett            #0
 337
 338         .size           __entry_kernel_external_interrupt_virtual_reenable,.-__entry_kernel_external_interrupt_virtual_reenable
 339
 340 ###############################################################################
 341 #
 342 # entry point for Software and Progam interrupts generated whilst executing userspace code
 343 #
 344 ###############################################################################
 345         .globl          __entry_uspace_softprog_interrupt
 346         .type           __entry_uspace_softprog_interrupt,@function
 347         .globl          __entry_uspace_handle_mmu_fault
 348 __entry_uspace_softprog_interrupt:
 349         LEDS            0x6000
 350 #ifdef CONFIG_MMU
 351         movsg           ear0,gr28
 352 __entry_uspace_handle_mmu_fault:
 353         movgs           gr28,scr2
 354 #endif
 355         sethi.p         %hi(__kernel_frame0_ptr),gr28
 356         setlo           %lo(__kernel_frame0_ptr),gr28
 357         ldi             @(gr28,#0),gr28
 358
 359         # handle h/w single-step through exceptions
 360         sti             gr0,@(gr28,#REG__STATUS)
 361
 362         .globl          __entry_uspace_softprog_interrupt_reentry
 363 __entry_uspace_softprog_interrupt_reentry:
 364         LEDS            0x6001
 365
 366         setlos          #REG__END,gr30
 367         dcpl            gr28,gr30,#0
 368
 369         # set up the kernel stack pointer
 370         sti.p           sp,@(gr28,#REG_SP)
 371         ori             gr28,0,sp
 372         sti             gr0,@(gr28,#REG_GR(28))
 373
 374         stdi            gr20,@(gr28,#REG_GR(20))
 375         stdi            gr22,@(gr28,#REG_GR(22))
 376
 377         movsg           tbr,gr20
 378         movsg           pcsr,gr21
 379         movsg           psr,gr22
 380
 381         sethi.p         %hi(__entry_return_from_user_exception),gr23
 382         setlo           %lo(__entry_return_from_user_exception),gr23
 383
 384         bra             __entry_common
 385
 386         .size           __entry_uspace_softprog_interrupt,.-__entry_uspace_softprog_interrupt
 387
 388         # single-stepping was disabled on entry to a TLB handler that then faulted
 389 #ifdef CONFIG_MMU
 390         .globl          __entry_uspace_handle_mmu_fault_sstep
 391 __entry_uspace_handle_mmu_fault_sstep:
 392         movgs           gr28,scr2
 393         sethi.p         %hi(__kernel_frame0_ptr),gr28
 394         setlo           %lo(__kernel_frame0_ptr),gr28
 395         ldi             @(gr28,#0),gr28
 396
 397         # flag single-step re-enablement
 398         sti             gr0,@(gr28,#REG__STATUS)
 399         bra             __entry_uspace_softprog_interrupt_reentry
 400 #endif
 401
 402
 403 ###############################################################################
 404 #
 405 # entry point for Software and Progam interrupts generated whilst executing kernel code
 406 #
 407 ###############################################################################
 408         .globl          __entry_kernel_softprog_interrupt
 409         .type           __entry_kernel_softprog_interrupt,@function
 410 __entry_kernel_softprog_interrupt:
 411         LEDS            0x6004
 412
 413 #ifdef CONFIG_MMU
 414         movsg           ear0,gr30
 415         movgs           gr30,scr2
 416 #endif
 417
 418         .globl          __entry_kernel_handle_mmu_fault
 419 __entry_kernel_handle_mmu_fault:
 420         # set up the stack pointer
 421         subi            sp,#REG__END,sp
 422         sti             sp,@(sp,#REG_SP)
 423         sti             sp,@(sp,#REG_SP-4)
 424         andi            sp,#~7,sp
 425
 426         # handle h/w single-step through exceptions
 427         sti             gr0,@(sp,#REG__STATUS)
 428
 429         .globl          __entry_kernel_softprog_interrupt_reentry
 430 __entry_kernel_softprog_interrupt_reentry:
 431         LEDS            0x6005
 432
 433         setlos          #REG__END,gr30
 434         dcpl            sp,gr30,#0
 435
 436         # set up the exception frame
 437         sti.p           gr28,@(sp,#REG_GR(28))
 438         ori             sp,0,gr28
 439
 440         stdi            gr20,@(gr28,#REG_GR(20))
 441         stdi            gr22,@(gr28,#REG_GR(22))
 442
 443         ldi             @(sp,#REG_SP),gr22              /* reconstruct the old SP */
 444         addi            gr22,#REG__END,gr22
 445         sti             gr22,@(sp,#REG_SP)
 446
 447         # set CCCR.CC3 to Undefined to abort atomic-modify completion inside the kernel
 448         # - for an explanation of how it works, see: Documentation/frv/atomic-ops.txt
 449         movsg           cccr,gr20
 450         andi            gr20,#~0xc0,gr20
 451         movgs           gr20,cccr
 452
 453         movsg           tbr,gr20
 454         movsg           pcsr,gr21
 455         movsg           psr,gr22
 456
 457         sethi.p         %hi(__entry_return_from_kernel_exception),gr23
 458         setlo           %lo(__entry_return_from_kernel_exception),gr23
 459         bra             __entry_common
 460
 461         .size           __entry_kernel_softprog_interrupt,.-__entry_kernel_softprog_interrupt
 462
 463         # single-stepping was disabled on entry to a TLB handler that then faulted
 464 #ifdef CONFIG_MMU
 465         .globl          __entry_kernel_handle_mmu_fault_sstep
 466 __entry_kernel_handle_mmu_fault_sstep:
 467         # set up the stack pointer
 468         subi            sp,#REG__END,sp
 469         sti             sp,@(sp,#REG_SP)
 470         sti             sp,@(sp,#REG_SP-4)
 471         andi            sp,#~7,sp
 472
 473         # flag single-step re-enablement
 474         sethi           #REG__STATUS_STEP,gr30
 475         sti             gr30,@(sp,#REG__STATUS)
 476         bra             __entry_kernel_softprog_interrupt_reentry
 477 #endif
 478
 479
 480 ###############################################################################
 481 #
 482 # the rest of the kernel entry point code
 483 # - on arriving here, the following registers should be set up:
 484 #       GR1     - kernel stack pointer
 485 #       GR7     - syscall number (trap 0 only)
 486 #       GR8-13  - syscall args (trap 0 only)
 487 #       GR20    - saved TBR
 488 #       GR21    - saved PC
 489 #       GR22    - saved PSR
 490 #       GR23    - return handler address
 491 #       GR28    - exception frame on stack
 492 #       SCR2    - saved EAR0 where applicable (clobbered by ICI & ICEF insns on FR451)
 493 #       PSR     - PSR.S 1, PSR.ET 0
 494 #
 495 ###############################################################################
 496         .globl          __entry_common
 497         .type           __entry_common,@function
 498 __entry_common:
 499         LEDS            0x6008
 500
 501         # finish building the exception frame
 502         stdi            gr2,@(gr28,#REG_GR(2))
 503         stdi            gr4,@(gr28,#REG_GR(4))
 504         stdi            gr6,@(gr28,#REG_GR(6))
 505         stdi            gr8,@(gr28,#REG_GR(8))
 506         stdi            gr10,@(gr28,#REG_GR(10))
 507         stdi            gr12,@(gr28,#REG_GR(12))
 508         stdi            gr14,@(gr28,#REG_GR(14))
 509         stdi            gr16,@(gr28,#REG_GR(16))
 510         stdi            gr18,@(gr28,#REG_GR(18))
 511         stdi            gr24,@(gr28,#REG_GR(24))
 512         stdi            gr26,@(gr28,#REG_GR(26))
 513         sti             gr29,@(gr28,#REG_GR(29))
 514         stdi            gr30,@(gr28,#REG_GR(30))
 515
 516         movsg           lcr ,gr27
 517         movsg           lr  ,gr26
 518         movgs           gr23,lr
 519         movsg           cccr,gr25
 520         movsg           ccr ,gr24
 521         movsg           isr ,gr23
 522
 523         setlos.p        #-1,gr4
 524         andi            gr22,#PSR_PS,gr5                /* try to rebuild original PSR value */
 525         andi.p          gr22,#~(PSR_PS|PSR_S),gr6
 526         slli            gr5,#1,gr5
 527         or              gr6,gr5,gr5
 528         andi            gr5,#~PSR_ET,gr5
 529
 530         sti             gr20,@(gr28,#REG_TBR)
 531         sti             gr21,@(gr28,#REG_PC)
 532         sti             gr5 ,@(gr28,#REG_PSR)
 533         sti             gr23,@(gr28,#REG_ISR)
 534         stdi            gr24,@(gr28,#REG_CCR)
 535         stdi            gr26,@(gr28,#REG_LR)
 536         sti             gr4 ,@(gr28,#REG_SYSCALLNO)
 537
 538         movsg           iacc0h,gr4
 539         movsg           iacc0l,gr5
 540         stdi            gr4,@(gr28,#REG_IACC0)
 541
 542         movsg           gner0,gr4
 543         movsg           gner1,gr5
 544         stdi.p          gr4,@(gr28,#REG_GNER0)
 545
 546         # set up virtual interrupt disablement
 547         subicc          gr0,#1,gr0,icc2                 /* clear Z flag, set C flag */
 548
 549         # set up kernel global registers
 550         sethi.p         %hi(__kernel_current_task),gr5
 551         setlo           %lo(__kernel_current_task),gr5
 552         sethi.p         %hi(_gp),gr16
 553         setlo           %lo(_gp),gr16
 554         ldi             @(gr5,#0),gr29
 555         ldi             @(gr29,#4),gr15         ; __current_thread_info = current->thread_info
 556
 557         # switch to the kernel trap table
 558         sethi.p         %hi(__entry_kerneltrap_table),gr6
 559         setlo           %lo(__entry_kerneltrap_table),gr6
 560         movgs           gr6,tbr
 561
 562         # make sure we (the kernel) get div-zero and misalignment exceptions
 563         setlos          #ISR_EDE|ISR_DTT_DIVBYZERO|ISR_EMAM_EXCEPTION,gr5
 564         movgs           gr5,isr
 565
 566         # clear power-saving mode flags
 567         movsg           hsr0,gr4
 568         andi            gr4,#~HSR0_PDM,gr4
 569         movgs           gr4,hsr0
 570
 571         # multiplex again using old TBR as a guide
 572         setlos.p        #TBR_TT,gr3
 573         sethi           %hi(__entry_vector_table),gr6
 574         and.p           gr20,gr3,gr5
 575         setlo           %lo(__entry_vector_table),gr6
 576         srli            gr5,#2,gr5
 577         ld              @(gr5,gr6),gr5
 578
 579         LEDS            0x6009
 580         jmpl            @(gr5,gr0)
 581
 582
 583         .size           __entry_common,.-__entry_common
 584
 585 ###############################################################################
 586 #
 587 # handle instruction MMU fault
 588 #
 589 ###############################################################################
 590 #ifdef CONFIG_MMU
 591         .globl          __entry_insn_mmu_fault
 592 __entry_insn_mmu_fault:
 593         LEDS            0x6010
 594         setlos          #0,gr8
 595         movsg           esr0,gr9
 596         movsg           scr2,gr10
 597
 598         # now that we've accessed the exception regs, we can enable exceptions
 599         movsg           psr,gr4
 600         ori             gr4,#PSR_ET,gr4
 601         movgs           gr4,psr
 602
 603         sethi.p         %hi(do_page_fault),gr5
 604         setlo           %lo(do_page_fault),gr5
 605         jmpl            @(gr5,gr0)      ; call do_page_fault(0,esr0,ear0)
 606 #endif
 607
 608
 609 ###############################################################################
 610 #
 611 # handle instruction access error
 612 #
 613 ###############################################################################
 614         .globl          __entry_insn_access_error
 615 __entry_insn_access_error:
 616         LEDS            0x6011
 617         sethi.p         %hi(insn_access_error),gr5
 618         setlo           %lo(insn_access_error),gr5
 619         movsg           esfr1,gr8
 620         movsg           epcr0,gr9
 621         movsg           esr0,gr10
 622
 623         # now that we've accessed the exception regs, we can enable exceptions
 624         movsg           psr,gr4
 625         ori             gr4,#PSR_ET,gr4
 626         movgs           gr4,psr
 627         jmpl            @(gr5,gr0)      ; call insn_access_error(esfr1,epcr0,esr0)
 628
 629 ###############################################################################
 630 #
 631 # handle various instructions of dubious legality
 632 #
 633 ###############################################################################
 634         .globl          __entry_unsupported_trap
 635         .globl          __entry_illegal_instruction
 636         .globl          __entry_privileged_instruction
 637         .globl          __entry_debug_exception
 638 __entry_unsupported_trap:
 639         subi            gr21,#4,gr21
 640         sti             gr21,@(gr28,#REG_PC)
 641 __entry_illegal_instruction:
 642 __entry_privileged_instruction:
 643 __entry_debug_exception:
 644         LEDS            0x6012
 645         sethi.p         %hi(illegal_instruction),gr5
 646         setlo           %lo(illegal_instruction),gr5
 647         movsg           esfr1,gr8
 648         movsg           epcr0,gr9
 649         movsg           esr0,gr10
 650
 651         # now that we've accessed the exception regs, we can enable exceptions
 652         movsg           psr,gr4
 653         ori             gr4,#PSR_ET,gr4
 654         movgs           gr4,psr
 655         jmpl            @(gr5,gr0)      ; call ill_insn(esfr1,epcr0,esr0)
 656
 657 ###############################################################################
 658 #
 659 # handle atomic operation emulation for userspace
 660 #
 661 ###############################################################################
 662         .globl          __entry_atomic_op
 663 __entry_atomic_op:
 664         LEDS            0x6012
 665         sethi.p         %hi(atomic_operation),gr5
 666         setlo           %lo(atomic_operation),gr5
 667         movsg           esfr1,gr8
 668         movsg           epcr0,gr9
 669         movsg           esr0,gr10
 670
 671         # now that we've accessed the exception regs, we can enable exceptions
 672         movsg           psr,gr4
 673         ori             gr4,#PSR_ET,gr4
 674         movgs           gr4,psr
 675         jmpl            @(gr5,gr0)      ; call atomic_operation(esfr1,epcr0,esr0)
 676
 677 ###############################################################################
 678 #
 679 # handle media exception
 680 #
 681 ###############################################################################
 682         .globl          __entry_media_exception
 683 __entry_media_exception:
 684         LEDS            0x6013
 685         sethi.p         %hi(media_exception),gr5
 686         setlo           %lo(media_exception),gr5
 687         movsg           msr0,gr8
 688         movsg           msr1,gr9
 689
 690         # now that we've accessed the exception regs, we can enable exceptions
 691         movsg           psr,gr4
 692         ori             gr4,#PSR_ET,gr4
 693         movgs           gr4,psr
 694         jmpl            @(gr5,gr0)      ; call media_excep(msr0,msr1)
 695
 696 ###############################################################################
 697 #
 698 # handle data MMU fault
 699 # handle data DAT fault (write-protect exception)
 700 #
 701 ###############################################################################
 702 #ifdef CONFIG_MMU
 703         .globl          __entry_data_mmu_fault
 704 __entry_data_mmu_fault:
 705         .globl          __entry_data_dat_fault
 706 __entry_data_dat_fault:
 707         LEDS            0x6014
 708         setlos          #1,gr8
 709         movsg           esr0,gr9
 710         movsg           scr2,gr10       ; saved EAR0
 711
 712         # now that we've accessed the exception regs, we can enable exceptions
 713         movsg           psr,gr4
 714         ori             gr4,#PSR_ET,gr4
 715         movgs           gr4,psr
 716
 717         sethi.p         %hi(do_page_fault),gr5
 718         setlo           %lo(do_page_fault),gr5
 719         jmpl            @(gr5,gr0)      ; call do_page_fault(1,esr0,ear0)
 720 #endif
 721
 722 ###############################################################################
 723 #
 724 # handle data and instruction access exceptions
 725 #
 726 ###############################################################################
 727         .globl          __entry_insn_access_exception
 728         .globl          __entry_data_access_exception
 729 __entry_insn_access_exception:
 730 __entry_data_access_exception:
 731         LEDS            0x6016
 732         sethi.p         %hi(memory_access_exception),gr5
 733         setlo           %lo(memory_access_exception),gr5
 734         movsg           esr0,gr8
 735         movsg           scr2,gr9        ; saved EAR0
 736         movsg           epcr0,gr10
 737
 738         # now that we've accessed the exception regs, we can enable exceptions
 739         movsg           psr,gr4
 740         ori             gr4,#PSR_ET,gr4
 741         movgs           gr4,psr
 742         jmpl            @(gr5,gr0)      ; call memory_access_error(esr0,ear0,epcr0)
 743
 744 ###############################################################################
 745 #
 746 # handle data access error
 747 #
 748 ###############################################################################
 749         .globl          __entry_data_access_error
 750 __entry_data_access_error:
 751         LEDS            0x6016
 752         sethi.p         %hi(data_access_error),gr5
 753         setlo           %lo(data_access_error),gr5
 754         movsg           esfr1,gr8
 755         movsg           esr15,gr9
 756         movsg           ear15,gr10
 757
 758         # now that we've accessed the exception regs, we can enable exceptions
 759         movsg           psr,gr4
 760         ori             gr4,#PSR_ET,gr4
 761         movgs           gr4,psr
 762         jmpl            @(gr5,gr0)      ; call data_access_error(esfr1,esr15,ear15)
 763
 764 ###############################################################################
 765 #
 766 # handle data store error
 767 #
 768 ###############################################################################
 769         .globl          __entry_data_store_error
 770 __entry_data_store_error:
 771         LEDS            0x6017
 772         sethi.p         %hi(data_store_error),gr5
 773         setlo           %lo(data_store_error),gr5
 774         movsg           esfr1,gr8
 775         movsg           esr14,gr9
 776
 777         # now that we've accessed the exception regs, we can enable exceptions
 778         movsg           psr,gr4
 779         ori             gr4,#PSR_ET,gr4
 780         movgs           gr4,psr
 781         jmpl            @(gr5,gr0)      ; call data_store_error(esfr1,esr14)
 782
 783 ###############################################################################
 784 #
 785 # handle division exception
 786 #
 787 ###############################################################################
 788         .globl          __entry_division_exception
 789 __entry_division_exception:
 790         LEDS            0x6018
 791         sethi.p         %hi(division_exception),gr5
 792         setlo           %lo(division_exception),gr5
 793         movsg           esfr1,gr8
 794         movsg           esr0,gr9
 795         movsg           isr,gr10
 796
 797         # now that we've accessed the exception regs, we can enable exceptions
 798         movsg           psr,gr4
 799         ori             gr4,#PSR_ET,gr4
 800         movgs           gr4,psr
 801         jmpl            @(gr5,gr0)      ; call div_excep(esfr1,esr0,isr)
 802
 803 ###############################################################################
 804 #
 805 # handle compound exception
 806 #
 807 ###############################################################################
 808         .globl          __entry_compound_exception
 809 __entry_compound_exception:
 810         LEDS            0x6019
 811         sethi.p         %hi(compound_exception),gr5
 812         setlo           %lo(compound_exception),gr5
 813         movsg           esfr1,gr8
 814         movsg           esr0,gr9
 815         movsg           esr14,gr10
 816         movsg           esr15,gr11
 817         movsg           msr0,gr12
 818         movsg           msr1,gr13
 819
 820         # now that we've accessed the exception regs, we can enable exceptions
 821         movsg           psr,gr4
 822         ori             gr4,#PSR_ET,gr4
 823         movgs           gr4,psr
 824         jmpl            @(gr5,gr0)      ; call comp_excep(esfr1,esr0,esr14,esr15,msr0,msr1)
 825
 826 ###############################################################################
 827 #
 828 # handle interrupts and NMIs
 829 #
 830 ###############################################################################
 831         .globl          __entry_do_IRQ
 832 __entry_do_IRQ:
 833         LEDS            0x6020
 834
 835         # we can enable exceptions
 836         movsg           psr,gr4
 837         ori             gr4,#PSR_ET,gr4
 838         movgs           gr4,psr
 839         bra             do_IRQ
 840
 841         .globl          __entry_do_NMI
 842 __entry_do_NMI:
 843         LEDS            0x6021
 844
 845         # we can enable exceptions
 846         movsg           psr,gr4
 847         ori             gr4,#PSR_ET,gr4
 848         movgs           gr4,psr
 849         bra             do_NMI
 850
 851 ###############################################################################
 852 #
 853 # the return path for a newly forked child process
 854 # - __switch_to() saved the old current pointer in GR8 for us
 855 #
 856 ###############################################################################
 857         .globl          ret_from_fork
 858 ret_from_fork:
 859         LEDS            0x6100
 860         call            schedule_tail
 861
 862         # fork & co. return 0 to child
 863         setlos.p        #0,gr8
 864         bra             __syscall_exit
 865
 866 ###################################################################################################
 867 #
 868 # Return to user mode is not as complex as all this looks,
 869 # but we want the default path for a system call return to
 870 # go as quickly as possible which is why some of this is
 871 # less clear than it otherwise should be.
 872 #
 873 ###################################################################################################
 874         .balign         L1_CACHE_BYTES
 875         .globl          system_call
 876 system_call:
 877         LEDS            0x6101
 878         movsg           psr,gr4                 ; enable exceptions
 879         ori             gr4,#PSR_ET,gr4
 880         movgs           gr4,psr
 881
 882         sti             gr7,@(gr28,#REG_SYSCALLNO)
 883         sti.p           gr8,@(gr28,#REG_ORIG_GR8)
 884
 885         subicc          gr7,#nr_syscalls,gr0,icc0
 886         bnc             icc0,#0,__syscall_badsys
 887
 888         ldi             @(gr15,#TI_FLAGS),gr4
 889         ori             gr4,#_TIF_SYSCALL_TRACE,gr4
 890         andicc          gr4,#_TIF_SYSCALL_TRACE,gr0,icc0
 891         bne             icc0,#0,__syscall_trace_entry
 892
 893 __syscall_call:
 894         slli.p          gr7,#2,gr7
 895         sethi           %hi(sys_call_table),gr5
 896         setlo           %lo(sys_call_table),gr5
 897         ld              @(gr5,gr7),gr4
 898         calll           @(gr4,gr0)
 899
 900
 901 ###############################################################################
 902 #
 903 # return to interrupted process
 904 #
 905 ###############################################################################
 906 __syscall_exit:
 907         LEDS            0x6300
 908
 909         sti             gr8,@(gr28,#REG_GR(8))  ; save return value
 910
 911         # rebuild saved psr - execve will change it for init/main.c
 912         ldi             @(gr28,#REG_PSR),gr22
 913         srli            gr22,#1,gr5
 914         andi.p          gr22,#~PSR_PS,gr22
 915         andi            gr5,#PSR_PS,gr5
 916         or              gr5,gr22,gr22
 917         ori             gr22,#PSR_S,gr22
 918
 919         # keep current PSR in GR23
 920         movsg           psr,gr23
 921
 922         # make sure we don't miss an interrupt setting need_resched or sigpending between
 923         # sampling and the RETT
 924         ori             gr23,#PSR_PIL_14,gr23
 925         movgs           gr23,psr
 926
 927         ldi             @(gr15,#TI_FLAGS),gr4
 928         sethi.p         %hi(_TIF_ALLWORK_MASK),gr5
 929         setlo           %lo(_TIF_ALLWORK_MASK),gr5
 930         andcc           gr4,gr5,gr0,icc0
 931         bne             icc0,#0,__syscall_exit_work
 932
 933         # restore all registers and return
 934 __entry_return_direct:
 935         LEDS            0x6301
 936
 937         andi            gr22,#~PSR_ET,gr22
 938         movgs           gr22,psr
 939
 940         ldi             @(gr28,#REG_ISR),gr23
 941         lddi            @(gr28,#REG_CCR),gr24
 942         lddi            @(gr28,#REG_LR) ,gr26
 943         ldi             @(gr28,#REG_PC) ,gr21
 944         ldi             @(gr28,#REG_TBR),gr20
 945
 946         movgs           gr20,tbr
 947         movgs           gr21,pcsr
 948         movgs           gr23,isr
 949         movgs           gr24,ccr
 950         movgs           gr25,cccr
 951         movgs           gr26,lr
 952         movgs           gr27,lcr
 953
 954         lddi            @(gr28,#REG_GNER0),gr4
 955         movgs           gr4,gner0
 956         movgs           gr5,gner1
 957
 958         lddi            @(gr28,#REG_IACC0),gr4
 959         movgs           gr4,iacc0h
 960         movgs           gr5,iacc0l
 961
 962         lddi            @(gr28,#REG_GR(4)) ,gr4
 963         lddi            @(gr28,#REG_GR(6)) ,gr6
 964         lddi            @(gr28,#REG_GR(8)) ,gr8
 965         lddi            @(gr28,#REG_GR(10)),gr10
 966         lddi            @(gr28,#REG_GR(12)),gr12
 967         lddi            @(gr28,#REG_GR(14)),gr14
 968         lddi            @(gr28,#REG_GR(16)),gr16
 969         lddi            @(gr28,#REG_GR(18)),gr18
 970         lddi            @(gr28,#REG_GR(20)),gr20
 971         lddi            @(gr28,#REG_GR(22)),gr22
 972         lddi            @(gr28,#REG_GR(24)),gr24
 973         lddi            @(gr28,#REG_GR(26)),gr26
 974         ldi             @(gr28,#REG_GR(29)),gr29
 975         lddi            @(gr28,#REG_GR(30)),gr30
 976
 977         # check to see if a debugging return is required
 978         LEDS            0x67f0
 979         movsg           ccr,gr2
 980         ldi             @(gr28,#REG__STATUS),gr3
 981         andicc          gr3,#REG__STATUS_STEP,gr0,icc0
 982         bne             icc0,#0,__entry_return_singlestep
 983         movgs           gr2,ccr
 984
 985         ldi             @(gr28,#REG_SP)    ,sp
 986         lddi            @(gr28,#REG_GR(2)) ,gr2
 987         ldi             @(gr28,#REG_GR(28)),gr28
 988
 989         LEDS            0x67fe
 990 //      movsg           pcsr,gr31
 991 //      LEDS32
 992
 993 #if 0
 994         # store the current frame in the workram on the FR451
 995         movgs           gr28,scr2
 996         sethi.p         %hi(0xfe800000),gr28
 997         setlo           %lo(0xfe800000),gr28
 998
 999         stdi            gr2,@(gr28,#REG_GR(2))
1000         stdi            gr4,@(gr28,#REG_GR(4))
1001         stdi            gr6,@(gr28,#REG_GR(6))
1002         stdi            gr8,@(gr28,#REG_GR(8))
1003         stdi            gr10,@(gr28,#REG_GR(10))
1004         stdi            gr12,@(gr28,#REG_GR(12))
1005         stdi            gr14,@(gr28,#REG_GR(14))
1006         stdi            gr16,@(gr28,#REG_GR(16))
1007         stdi            gr18,@(gr28,#REG_GR(18))
1008         stdi            gr24,@(gr28,#REG_GR(24))
1009         stdi            gr26,@(gr28,#REG_GR(26))
1010         sti             gr29,@(gr28,#REG_GR(29))
1011         stdi            gr30,@(gr28,#REG_GR(30))
1012
1013         movsg           tbr ,gr30
1014         sti             gr30,@(gr28,#REG_TBR)
1015         movsg           pcsr,gr30
1016         sti             gr30,@(gr28,#REG_PC)
1017         movsg           psr ,gr30
1018         sti             gr30,@(gr28,#REG_PSR)
1019         movsg           isr ,gr30
1020         sti             gr30,@(gr28,#REG_ISR)
1021         movsg           ccr ,gr30
1022         movsg           cccr,gr31
1023         stdi            gr30,@(gr28,#REG_CCR)
1024         movsg           lr  ,gr30
1025         movsg           lcr ,gr31
1026         stdi            gr30,@(gr28,#REG_LR)
1027         sti             gr0 ,@(gr28,#REG_SYSCALLNO)
1028         movsg           scr2,gr28
1029 #endif
1030
1031         rett            #0
1032
1033         # return via break.S
1034 __entry_return_singlestep:
1035         movgs           gr2,ccr
1036         lddi            @(gr28,#REG_GR(2)) ,gr2
1037         ldi             @(gr28,#REG_SP)    ,sp
1038         ldi             @(gr28,#REG_GR(28)),gr28
1039         LEDS            0x67ff
1040         break
1041         .globl          __entry_return_singlestep_breaks_here
1042 __entry_return_singlestep_breaks_here:
1043         nop
1044
1045
1046 ###############################################################################
1047 #
1048 # return to a process interrupted in kernel space
1049 # - we need to consider preemption if that is enabled
1050 #
1051 ###############################################################################
1052         .balign         L1_CACHE_BYTES
1053 __entry_return_from_kernel_exception:
1054         LEDS            0x6302
1055         movsg           psr,gr23
1056         ori             gr23,#PSR_PIL_14,gr23
1057         movgs           gr23,psr
1058         bra             __entry_return_direct
1059
1060         .balign         L1_CACHE_BYTES
1061 __entry_return_from_kernel_interrupt:
1062         LEDS            0x6303
1063         movsg           psr,gr23
1064         ori             gr23,#PSR_PIL_14,gr23
1065         movgs           gr23,psr
1066
1067 #ifdef CONFIG_PREEMPT
1068         ldi             @(gr15,#TI_PRE_COUNT),gr5
1069         subicc          gr5,#0,gr0,icc0
1070         beq             icc0,#0,__entry_return_direct
1071
1072 __entry_preempt_need_resched:
1073         ldi             @(gr15,#TI_FLAGS),gr4
1074         andicc          gr4,#_TIF_NEED_RESCHED,gr0,icc0
1075         beq             icc0,#1,__entry_return_direct
1076
1077         setlos          #PREEMPT_ACTIVE,gr5
1078         sti             gr5,@(gr15,#TI_FLAGS)
1079
1080         andi            gr23,#~PSR_PIL,gr23
1081         movgs           gr23,psr
1082
1083         call            schedule
1084         sti             gr0,@(gr15,#TI_PRE_COUNT)
1085
1086         movsg           psr,gr23
1087         ori             gr23,#PSR_PIL_14,gr23
1088         movgs           gr23,psr
1089         bra             __entry_preempt_need_resched
1090 #else
1091         bra             __entry_return_direct
1092 #endif
1093
1094
1095 ###############################################################################
1096 #
1097 # perform work that needs to be done immediately before resumption
1098 #
1099 ###############################################################################
1100         .globl          __entry_return_from_user_exception
1101         .balign         L1_CACHE_BYTES
1102 __entry_return_from_user_exception:
1103         LEDS            0x6501
1104
1105 __entry_resume_userspace:
1106         # make sure we don't miss an interrupt setting need_resched or sigpending between
1107         # sampling and the RETT
1108         movsg           psr,gr23
1109         ori             gr23,#PSR_PIL_14,gr23
1110         movgs           gr23,psr
1111
1112 __entry_return_from_user_interrupt:
1113         LEDS            0x6402
1114         ldi             @(gr15,#TI_FLAGS),gr4
1115         sethi.p         %hi(_TIF_WORK_MASK),gr5
1116         setlo           %lo(_TIF_WORK_MASK),gr5
1117         andcc           gr4,gr5,gr0,icc0
1118         beq             icc0,#1,__entry_return_direct
1119
1120 __entry_work_pending:
1121         LEDS            0x6404
1122         andicc          gr4,#_TIF_NEED_RESCHED,gr0,icc0
1123         beq             icc0,#1,__entry_work_notifysig
1124
1125 __entry_work_resched:
1126         LEDS            0x6408
1127         movsg           psr,gr23
1128         andi            gr23,#~PSR_PIL,gr23
1129         movgs           gr23,psr
1130         call            schedule
1131         movsg           psr,gr23
1132         ori             gr23,#PSR_PIL_14,gr23
1133         movgs           gr23,psr
1134
1135         LEDS            0x6401
1136         ldi             @(gr15,#TI_FLAGS),gr4
1137         sethi.p         %hi(_TIF_WORK_MASK),gr5
1138         setlo           %lo(_TIF_WORK_MASK),gr5
1139         andcc           gr4,gr5,gr0,icc0
1140         beq             icc0,#1,__entry_return_direct
1141         andicc          gr4,#_TIF_NEED_RESCHED,gr0,icc0
1142         bne             icc0,#1,__entry_work_resched
1143
1144 __entry_work_notifysig:
1145         LEDS            0x6410
1146         ori.p           gr4,#0,gr8
1147         call            do_notify_resume
1148         bra             __entry_resume_userspace
1149
1150         # perform syscall entry tracing
1151 __syscall_trace_entry:
1152         LEDS            0x6320
1153         setlos.p        #0,gr8
1154         call            do_syscall_trace
1155
1156         ldi             @(gr28,#REG_SYSCALLNO),gr7
1157         lddi            @(gr28,#REG_GR(8)) ,gr8
1158         lddi            @(gr28,#REG_GR(10)),gr10
1159         lddi.p          @(gr28,#REG_GR(12)),gr12
1160
1161         subicc          gr7,#nr_syscalls,gr0,icc0
1162         bnc             icc0,#0,__syscall_badsys
1163         bra             __syscall_call
1164
1165         # perform syscall exit tracing
1166 __syscall_exit_work:
1167         LEDS            0x6340
1168         andicc          gr4,#_TIF_SYSCALL_TRACE,gr0,icc0
1169         beq             icc0,#1,__entry_work_pending
1170
1171         movsg           psr,gr23
1172         andi            gr23,#~PSR_PIL,gr23     ; could let do_syscall_trace() call schedule()
1173         movgs           gr23,psr
1174
1175         setlos.p        #1,gr8
1176         call            do_syscall_trace
1177         bra             __entry_resume_userspace
1178
1179 __syscall_badsys:
1180         LEDS            0x6380
1181         setlos          #-ENOSYS,gr8
1182         sti             gr8,@(gr28,#REG_GR(8))  ; save return value
1183         bra             __entry_resume_userspace
1184
1185
1186 ###############################################################################
1187 #
1188 # syscall vector table
1189 #
1190 ###############################################################################
1191         .section .rodata
1192 ALIGN
1193         .globl          sys_call_table
1194 sys_call_table:
1195         .long sys_restart_syscall       /* 0 - old "setup()" system call, used for restarting */
1196         .long sys_exit
1197         .long sys_fork
1198         .long sys_read
1199         .long sys_write
1200         .long sys_open          /* 5 */
1201         .long sys_close
1202         .long sys_waitpid
1203         .long sys_creat
1204         .long sys_link
1205         .long sys_unlink                /* 10 */
1206         .long sys_execve
1207         .long sys_chdir
1208         .long sys_time
1209         .long sys_mknod
1210         .long sys_chmod         /* 15 */
1211         .long sys_lchown16
1212         .long sys_ni_syscall                    /* old break syscall holder */
1213         .long sys_stat
1214         .long sys_lseek
1215         .long sys_getpid                /* 20 */
1216         .long sys_mount
1217         .long sys_oldumount
1218         .long sys_setuid16
1219         .long sys_getuid16
1220         .long sys_ni_syscall // sys_stime               /* 25 */
1221         .long sys_ptrace
1222         .long sys_alarm
1223         .long sys_fstat
1224         .long sys_pause
1225         .long sys_utime         /* 30 */
1226         .long sys_ni_syscall                    /* old stty syscall holder */
1227         .long sys_ni_syscall                    /* old gtty syscall holder */
1228         .long sys_access
1229         .long sys_nice
1230         .long sys_ni_syscall    /* 35 */        /* old ftime syscall holder */
1231         .long sys_sync
1232         .long sys_kill
1233         .long sys_rename
1234         .long sys_mkdir
1235         .long sys_rmdir         /* 40 */
1236         .long sys_dup
1237         .long sys_pipe
1238         .long sys_times
1239         .long sys_ni_syscall                    /* old prof syscall holder */
1240         .long sys_brk           /* 45 */
1241         .long sys_setgid16
1242         .long sys_getgid16
1243         .long sys_ni_syscall // sys_signal
1244         .long sys_geteuid16
1245         .long sys_getegid16     /* 50 */
1246         .long sys_acct
1247         .long sys_umount                                /* recycled never used phys( */
1248         .long sys_ni_syscall                    /* old lock syscall holder */
1249         .long sys_ioctl
1250         .long sys_fcntl         /* 55 */
1251         .long sys_ni_syscall                    /* old mpx syscall holder */
1252         .long sys_setpgid
1253         .long sys_ni_syscall                    /* old ulimit syscall holder */
1254         .long sys_ni_syscall                    /* old old uname syscall */
1255         .long sys_umask         /* 60 */
1256         .long sys_chroot
1257         .long sys_ustat
1258         .long sys_dup2
1259         .long sys_getppid
1260         .long sys_getpgrp       /* 65 */
1261         .long sys_setsid
1262         .long sys_sigaction
1263         .long sys_ni_syscall // sys_sgetmask
1264         .long sys_ni_syscall // sys_ssetmask
1265         .long sys_setreuid16    /* 70 */
1266         .long sys_setregid16
1267         .long sys_sigsuspend
1268         .long sys_ni_syscall // sys_sigpending
1269         .long sys_sethostname
1270         .long sys_setrlimit     /* 75 */
1271         .long sys_ni_syscall // sys_old_getrlimit
1272         .long sys_getrusage
1273         .long sys_gettimeofday
1274         .long sys_settimeofday
1275         .long sys_getgroups16   /* 80 */
1276         .long sys_setgroups16
1277         .long sys_ni_syscall                    /* old_select slot */
1278         .long sys_symlink
1279         .long sys_lstat
1280         .long sys_readlink              /* 85 */
1281         .long sys_uselib
1282         .long sys_swapon
1283         .long sys_reboot
1284         .long sys_ni_syscall // old_readdir
1285         .long sys_ni_syscall    /* 90 */        /* old_mmap slot */
1286         .long sys_munmap
1287         .long sys_truncate
1288         .long sys_ftruncate
1289         .long sys_fchmod
1290         .long sys_fchown16              /* 95 */
1291         .long sys_getpriority
1292         .long sys_setpriority
1293         .long sys_ni_syscall                    /* old profil syscall holder */
1294         .long sys_statfs
1295         .long sys_fstatfs               /* 100 */
1296         .long sys_ni_syscall                    /* ioperm for i386 */
1297         .long sys_socketcall
1298         .long sys_syslog
1299         .long sys_setitimer
1300         .long sys_getitimer     /* 105 */
1301         .long sys_newstat
1302         .long sys_newlstat
1303         .long sys_newfstat
1304         .long sys_ni_syscall    /* obsolete olduname( syscall */
1305         .long sys_ni_syscall    /* iopl for i386 */ /* 110 */
1306         .long sys_vhangup
1307         .long sys_ni_syscall    /* obsolete idle( syscall */
1308         .long sys_ni_syscall    /* vm86old for i386 */
1309         .long sys_wait4
1310         .long sys_swapoff               /* 115 */
1311         .long sys_sysinfo
1312         .long sys_ipc
1313         .long sys_fsync
1314         .long sys_sigreturn
1315         .long sys_clone         /* 120 */
1316         .long sys_setdomainname
1317         .long sys_newuname
1318         .long sys_ni_syscall    /* old "cacheflush" */
1319         .long sys_adjtimex
1320         .long sys_mprotect      /* 125 */
1321         .long sys_sigprocmask
1322         .long sys_ni_syscall    /* old "create_module" */
1323         .long sys_init_module
1324         .long sys_delete_module
1325         .long sys_ni_syscall    /* old "get_kernel_syms" */
1326         .long sys_quotactl
1327         .long sys_getpgid
1328         .long sys_fchdir
1329         .long sys_bdflush
1330         .long sys_sysfs         /* 135 */
1331         .long sys_personality
1332         .long sys_ni_syscall    /* for afs_syscall */
1333         .long sys_setfsuid16
1334         .long sys_setfsgid16
1335         .long sys_llseek                /* 140 */
1336         .long sys_getdents
1337         .long sys_select
1338         .long sys_flock
1339         .long sys_msync
1340         .long sys_readv         /* 145 */
1341         .long sys_writev
1342         .long sys_getsid
1343         .long sys_fdatasync
1344         .long sys_sysctl
1345         .long sys_mlock         /* 150 */
1346         .long sys_munlock
1347         .long sys_mlockall
1348         .long sys_munlockall
1349         .long sys_sched_setparam
1350         .long sys_sched_getparam   /* 155 */
1351         .long sys_sched_setscheduler
1352         .long sys_sched_getscheduler
1353         .long sys_sched_yield
1354         .long sys_sched_get_priority_max
1355         .long sys_sched_get_priority_min  /* 160 */
1356         .long sys_sched_rr_get_interval
1357         .long sys_nanosleep
1358         .long sys_mremap
1359         .long sys_setresuid16
1360         .long sys_getresuid16   /* 165 */
1361         .long sys_ni_syscall    /* for vm86 */
1362         .long sys_ni_syscall    /* Old sys_query_module */
1363         .long sys_poll
1364         .long sys_nfsservctl
1365         .long sys_setresgid16   /* 170 */
1366         .long sys_getresgid16
1367         .long sys_prctl
1368         .long sys_rt_sigreturn
1369         .long sys_rt_sigaction
1370         .long sys_rt_sigprocmask        /* 175 */
1371         .long sys_rt_sigpending
1372         .long sys_rt_sigtimedwait
1373         .long sys_rt_sigqueueinfo
1374         .long sys_rt_sigsuspend
1375         .long sys_pread64               /* 180 */
1376         .long sys_pwrite64
1377         .long sys_chown16
1378         .long sys_getcwd
1379         .long sys_capget
1380         .long sys_capset           /* 185 */
1381         .long sys_sigaltstack
1382         .long sys_sendfile
1383         .long sys_ni_syscall            /* streams1 */
1384         .long sys_ni_syscall            /* streams2 */
1385         .long sys_vfork            /* 190 */
1386         .long sys_getrlimit
1387         .long sys_mmap2
1388         .long sys_truncate64
1389         .long sys_ftruncate64
1390         .long sys_stat64                /* 195 */
1391         .long sys_lstat64
1392         .long sys_fstat64
1393         .long sys_lchown
1394         .long sys_getuid
1395         .long sys_getgid                /* 200 */
1396         .long sys_geteuid
1397         .long sys_getegid
1398         .long sys_setreuid
1399         .long sys_setregid
1400         .long sys_getgroups     /* 205 */
1401         .long sys_setgroups
1402         .long sys_fchown
1403         .long sys_setresuid
1404         .long sys_getresuid
1405         .long sys_setresgid     /* 210 */
1406         .long sys_getresgid
1407         .long sys_chown
1408         .long sys_setuid
1409         .long sys_setgid
1410         .long sys_setfsuid              /* 215 */
1411         .long sys_setfsgid
1412         .long sys_pivot_root
1413         .long sys_mincore
1414         .long sys_madvise
1415         .long sys_getdents64    /* 220 */
1416         .long sys_fcntl64
1417         .long sys_ni_syscall    /* reserved for TUX */
1418         .long sys_ni_syscall    /* Reserved for Security */
1419         .long sys_gettid
1420         .long sys_readahead     /* 225 */
1421         .long sys_setxattr
1422         .long sys_lsetxattr
1423         .long sys_fsetxattr
1424         .long sys_getxattr
1425         .long sys_lgetxattr     /* 230 */
1426         .long sys_fgetxattr
1427         .long sys_listxattr
1428         .long sys_llistxattr
1429         .long sys_flistxattr
1430         .long sys_removexattr   /* 235 */
1431         .long sys_lremovexattr
1432         .long sys_fremovexattr
1433         .long sys_tkill
1434         .long sys_sendfile64
1435         .long sys_futex         /* 240 */
1436         .long sys_sched_setaffinity
1437         .long sys_sched_getaffinity
1438         .long sys_ni_syscall    //sys_set_thread_area
1439         .long sys_ni_syscall    //sys_get_thread_area
1440         .long sys_io_setup      /* 245 */
1441         .long sys_io_destroy
1442         .long sys_io_getevents
1443         .long sys_io_submit
1444         .long sys_io_cancel
1445         .long sys_fadvise64     /* 250 */
1446         .long sys_ni_syscall
1447         .long sys_exit_group
1448         .long sys_lookup_dcookie
1449         .long sys_epoll_create
1450         .long sys_epoll_ctl     /* 255 */
1451         .long sys_epoll_wait
1452         .long sys_remap_file_pages
1453         .long sys_set_tid_address
1454         .long sys_timer_create
1455         .long sys_timer_settime         /* 260 */
1456         .long sys_timer_gettime
1457         .long sys_timer_getoverrun
1458         .long sys_timer_delete
1459         .long sys_clock_settime
1460         .long sys_clock_gettime         /* 265 */
1461         .long sys_clock_getres
1462         .long sys_clock_nanosleep
1463         .long sys_statfs64
1464         .long sys_fstatfs64
1465         .long sys_tgkill        /* 270 */
1466         .long sys_utimes
1467         .long sys_fadvise64_64
1468         .long sys_ni_syscall    /* sys_vserver */
1469         .long sys_mbind
1470         .long sys_get_mempolicy
1471         .long sys_set_mempolicy
1472         .long sys_mq_open
1473         .long sys_mq_unlink
1474         .long sys_mq_timedsend
1475         .long sys_mq_timedreceive       /* 280 */
1476         .long sys_mq_notify
1477         .long sys_mq_getsetattr
1478         .long sys_ni_syscall            /* reserved for kexec */
1479         .long sys_waitid
1480         .long sys_ni_syscall            /* 285 */ /* available */
1481         .long sys_add_key
1482         .long sys_request_key
1483         .long sys_keyctl
1484         .long sys_ioprio_set
1485         .long sys_ioprio_get            /* 290 */
1486         .long sys_inotify_init
1487         .long sys_inotify_add_watch
1488         .long sys_inotify_rm_watch
1489         .long sys_migrate_pages
1490         .long sys_openat                /* 295 */
1491         .long sys_mkdirat
1492         .long sys_mknodat
1493         .long sys_fchownat
1494         .long sys_futimesat
1495         .long sys_fstatat64             /* 300 */
1496         .long sys_unlinkat
1497         .long sys_renameat
1498         .long sys_linkat
1499         .long sys_symlinkat
1500         .long sys_readlinkat            /* 305 */
1501         .long sys_fchmodat
1502         .long sys_faccessat
1503         .long sys_pselect6
1504         .long sys_ppoll
1505         .long sys_unshare               /* 310 */
1506         .long sys_set_robust_list
1507         .long sys_get_robust_list
1508         .long sys_splice
1509         .long sys_sync_file_range
1510         .long sys_tee                   /* 315 */
1511         .long sys_vmsplice
1512         .long sys_move_pages
1513         .long sys_getcpu
1514         .long sys_epoll_pwait
1515         .long sys_utimensat             /* 320 */
1516         .long sys_signalfd
1517         .long sys_timerfd_create
1518         .long sys_eventfd
1519         .long sys_fallocate
1520         .long sys_timerfd_settime       /* 325 */
1521         .long sys_timerfd_gettime
1522
1523
1524 syscall_table_size = (. - sys_call_table)