1 /* !! 1 /* $Id: entry.S,v 1.170 2001/11/13 00:57:05 davem Exp $
2 * This file is subject to the terms and condi !! 2 * arch/sparc/kernel/entry.S: Sparc trap low-level entry points.
3 * License. See the file "COPYING" in the mai <<
4 * for more details. <<
5 * 3 *
6 * Copyright (C) 1994 - 2000, 2001, 2003 Ralf !! 4 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
7 * Copyright (C) 1999, 2000 Silicon Graphics, !! 5 * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
8 * Copyright (C) 2001 MIPS Technologies, Inc. !! 6 * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
>> 7 * Copyright (C) 1996-1999 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
>> 8 * Copyright (C) 1997 Anton Blanchard (anton@progsoc.uts.edu.au)
9 */ 9 */
10 10
11 #include <asm/asm.h> !! 11 #include <linux/config.h>
12 #include <asm/asmmacro.h> !! 12 #include <linux/errno.h>
13 #include <asm/compiler.h> <<
14 #include <asm/irqflags.h> <<
15 #include <asm/regdef.h> <<
16 #include <asm/mipsregs.h> <<
17 #include <asm/stackframe.h> <<
18 #include <asm/isadep.h> <<
19 #include <asm/thread_info.h> <<
20 13
21 #ifndef CONFIG_PREEMPTION !! 14 #include <asm/head.h>
22 #define resume_kernel restore_all !! 15 #include <asm/asi.h>
>> 16 #include <asm/smp.h>
>> 17 #include <asm/kgdb.h>
>> 18 #include <asm/contregs.h>
>> 19 #include <asm/ptrace.h>
>> 20 #include <asm/psr.h>
>> 21 #include <asm/cprefix.h>
>> 22 #include <asm/vaddrs.h>
>> 23 #include <asm/memreg.h>
>> 24 #include <asm/page.h>
>> 25 #ifdef CONFIG_SUN4
>> 26 #include <asm/pgtsun4.h>
23 #else 27 #else
24 #define __ret_from_irq ret_from_exception !! 28 #include <asm/pgtsun4c.h>
25 #endif 29 #endif
>> 30 #include <asm/winmacro.h>
>> 31 #include <asm/signal.h>
>> 32 #include <asm/obio.h>
>> 33 #include <asm/mxcc.h>
>> 34
>> 35 #include <asm/asmmacro.h>
>> 36
>> 37 #define curptr g6
>> 38
>> 39 #define NR_SYSCALLS 256 /* Each OS is different... */
>> 40
>> 41 /* These are just handy. */
>> 42 #define _SV save %sp, -STACKFRAME_SZ, %sp
>> 43 #define _RS restore
>> 44
>> 45 #define FLUSH_ALL_KERNEL_WINDOWS \
>> 46 _SV; _SV; _SV; _SV; _SV; _SV; _SV; \
>> 47 _RS; _RS; _RS; _RS; _RS; _RS; _RS;
>> 48
>> 49 /* First, KGDB low level things. This is a rewrite
>> 50 * of the routines found in the sparc-stub.c asm() statement
>> 51 * from the gdb distribution. This is also dual-purpose
>> 52 * as a software trap for userlevel programs.
>> 53 */
>> 54 .data
>> 55 .align 4
>> 56
>> 57 in_trap_handler:
>> 58 .word 0
26 59
27 .text 60 .text
28 .align 5 !! 61 .align 4
29 #ifndef CONFIG_PREEMPTION !! 62
30 FEXPORT(ret_from_exception) !! 63 ! This function is called when any SPARC trap (except window overflow or
31 local_irq_disable !! 64 ! underflow) occurs. It makes sure that the invalid register window is still
32 b __ret_from_irq !! 65 ! available before jumping into C code. It will also restore the world if you
33 #endif !! 66 ! return from handle_exception.
34 FEXPORT(ret_from_irq) !! 67
35 LONG_S s0, TI_REGS($28) !! 68 .globl C_LABEL(trap_low)
36 FEXPORT(__ret_from_irq) !! 69 C_LABEL(trap_low):
>> 70 rd %wim, %l3
>> 71 SAVE_ALL
>> 72
>> 73 sethi %hi(in_trap_handler), %l4
>> 74 ld [%lo(in_trap_handler) + %l4], %l5
>> 75 inc %l5
>> 76 st %l5, [%lo(in_trap_handler) + %l4]
>> 77
>> 78 /* Make sure kgdb sees the same state we just saved. */
>> 79 LOAD_PT_GLOBALS(sp)
>> 80 LOAD_PT_INS(sp)
>> 81 ld [%sp + STACKFRAME_SZ + PT_Y], %l4
>> 82 ld [%sp + STACKFRAME_SZ + PT_WIM], %l3
>> 83 ld [%sp + STACKFRAME_SZ + PT_PSR], %l0
>> 84 ld [%sp + STACKFRAME_SZ + PT_PC], %l1
>> 85 ld [%sp + STACKFRAME_SZ + PT_NPC], %l2
>> 86 rd %tbr, %l5 /* Never changes... */
>> 87
>> 88 /* Make kgdb exception frame. */
>> 89 sub %sp,(16+1+6+1+72)*4,%sp ! Make room for input & locals
>> 90 ! + hidden arg + arg spill
>> 91 ! + doubleword alignment
>> 92 ! + registers[72] local var
>> 93 SAVE_KGDB_GLOBALS(sp)
>> 94 SAVE_KGDB_INS(sp)
>> 95 SAVE_KGDB_SREGS(sp, l4, l0, l3, l5, l1, l2)
>> 96
>> 97 /* We are increasing PIL, so two writes. */
>> 98 or %l0, PSR_PIL, %l0
>> 99 wr %l0, 0, %psr
>> 100 WRITE_PAUSE
>> 101 wr %l0, PSR_ET, %psr
>> 102 WRITE_PAUSE
>> 103
>> 104 call C_LABEL(handle_exception)
>> 105 add %sp, STACKFRAME_SZ, %o0 ! Pass address of registers
>> 106
>> 107 /* Load new kgdb register set. */
>> 108 LOAD_KGDB_GLOBALS(sp)
>> 109 LOAD_KGDB_INS(sp)
>> 110 LOAD_KGDB_SREGS(sp, l4, l0, l3, l5, l1, l2)
>> 111 wr %l4, 0x0, %y
>> 112
>> 113 sethi %hi(in_trap_handler), %l4
>> 114 ld [%lo(in_trap_handler) + %l4], %l5
>> 115 dec %l5
>> 116 st %l5, [%lo(in_trap_handler) + %l4]
>> 117
>> 118 add %sp,(16+1+6+1+72)*4,%sp ! Undo the kgdb trap frame.
>> 119
>> 120 /* Now take what kgdb did and place it into the pt_regs
>> 121 * frame which SparcLinux RESTORE_ALL understands.,
>> 122 */
>> 123 STORE_PT_INS(sp)
>> 124 STORE_PT_GLOBALS(sp)
>> 125 STORE_PT_YREG(sp, g2)
>> 126 STORE_PT_PRIV(sp, l0, l1, l2)
>> 127
>> 128 RESTORE_ALL
>> 129
>> 130
>> 131 #ifdef CONFIG_BLK_DEV_FD
>> 132 .text
>> 133 .align 4
>> 134 .globl C_LABEL(floppy_hardint)
>> 135 C_LABEL(floppy_hardint):
>> 136 /*
>> 137 * This code cannot touch registers %l0 %l1 and %l2
>> 138 * because SAVE_ALL depends on their values. It depends
>> 139 * on %l3 also, but we regenerate it before a call.
>> 140 * Other registers are:
>> 141 * %l3 -- base address of fdc registers
>> 142 * %l4 -- pdma_vaddr
>> 143 * %l5 -- scratch for ld/st address
>> 144 * %l6 -- pdma_size
>> 145 * %l7 -- scratch [floppy byte, ld/st address, aux. data]
>> 146 */
>> 147
>> 148 /* Do we have work to do? */
>> 149 sethi %hi(C_LABEL(doing_pdma)), %l7
>> 150 ld [%l7 + %lo(C_LABEL(doing_pdma))], %l7
>> 151 cmp %l7, 0
>> 152 be floppy_dosoftint
>> 153 nop
>> 154
>> 155 /* Load fdc register base */
>> 156 sethi %hi(C_LABEL(fdc_status)), %l3
>> 157 ld [%l3 + %lo(C_LABEL(fdc_status))], %l3
>> 158
>> 159 /* Setup register addresses */
>> 160 sethi %hi(C_LABEL(pdma_vaddr)), %l5 ! transfer buffer
>> 161 ld [%l5 + %lo(C_LABEL(pdma_vaddr))], %l4
>> 162 sethi %hi(C_LABEL(pdma_size)), %l5 ! bytes to go
>> 163 ld [%l5 + %lo(C_LABEL(pdma_size))], %l6
>> 164 next_byte:
>> 165 ldub [%l3], %l7
>> 166
>> 167 andcc %l7, 0x80, %g0 ! Does fifo still have data
>> 168 bz floppy_fifo_emptied ! fifo has been emptied...
>> 169 andcc %l7, 0x20, %g0 ! in non-dma mode still?
>> 170 bz floppy_overrun ! nope, overrun
>> 171 andcc %l7, 0x40, %g0 ! 0=write 1=read
>> 172 bz floppy_write
>> 173 sub %l6, 0x1, %l6
>> 174
>> 175 /* Ok, actually read this byte */
>> 176 ldub [%l3 + 1], %l7
>> 177 orcc %g0, %l6, %g0
>> 178 stb %l7, [%l4]
>> 179 bne next_byte
>> 180 add %l4, 0x1, %l4
>> 181
>> 182 b floppy_tdone
>> 183 nop
>> 184
>> 185 floppy_write:
>> 186 /* Ok, actually write this byte */
>> 187 ldub [%l4], %l7
>> 188 orcc %g0, %l6, %g0
>> 189 stb %l7, [%l3 + 1]
>> 190 bne next_byte
>> 191 add %l4, 0x1, %l4
>> 192
>> 193 /* fall through... */
>> 194 floppy_tdone:
>> 195 sethi %hi(C_LABEL(pdma_vaddr)), %l5
>> 196 st %l4, [%l5 + %lo(C_LABEL(pdma_vaddr))]
>> 197 sethi %hi(C_LABEL(pdma_size)), %l5
>> 198 st %l6, [%l5 + %lo(C_LABEL(pdma_size))]
>> 199 /* Flip terminal count pin */
>> 200 set C_LABEL(auxio_register), %l7
>> 201 ld [%l7], %l7
>> 202
>> 203 set C_LABEL(sparc_cpu_model), %l5
>> 204 ld [%l5], %l5
>> 205 subcc %l5, 1, %g0 /* enum { sun4c = 1 }; */
>> 206 be 1f
>> 207 ldub [%l7], %l5
>> 208
>> 209 or %l5, 0xc2, %l5
>> 210 stb %l5, [%l7]
>> 211 andn %l5, 0x02, %l5
>> 212 b 2f
>> 213 nop
>> 214
>> 215 1:
>> 216 or %l5, 0xf4, %l5
>> 217 stb %l5, [%l7]
>> 218 andn %l5, 0x04, %l5
>> 219
>> 220 2:
>> 221 /* Kill some time so the bits set */
>> 222 WRITE_PAUSE
>> 223 WRITE_PAUSE
>> 224
>> 225 stb %l5, [%l7]
>> 226
>> 227 /* Prevent recursion */
>> 228 sethi %hi(C_LABEL(doing_pdma)), %l7
>> 229 b floppy_dosoftint
>> 230 st %g0, [%l7 + %lo(C_LABEL(doing_pdma))]
>> 231
>> 232 /* We emptied the FIFO, but we haven't read everything
>> 233 * as of yet. Store the current transfer address and
>> 234 * bytes left to read so we can continue when the next
>> 235 * fast IRQ comes in.
>> 236 */
>> 237 floppy_fifo_emptied:
>> 238 sethi %hi(C_LABEL(pdma_vaddr)), %l5
>> 239 st %l4, [%l5 + %lo(C_LABEL(pdma_vaddr))]
>> 240 sethi %hi(C_LABEL(pdma_size)), %l7
>> 241 st %l6, [%l7 + %lo(C_LABEL(pdma_size))]
>> 242
>> 243 /* Restore condition codes */
>> 244 wr %l0, 0x0, %psr
>> 245 WRITE_PAUSE
>> 246
>> 247 jmp %l1
>> 248 rett %l2
>> 249
>> 250 floppy_overrun:
>> 251 sethi %hi(C_LABEL(pdma_vaddr)), %l5
>> 252 st %l4, [%l5 + %lo(C_LABEL(pdma_vaddr))]
>> 253 sethi %hi(C_LABEL(pdma_size)), %l5
>> 254 st %l6, [%l5 + %lo(C_LABEL(pdma_size))]
>> 255 /* Prevent recursion */
>> 256 sethi %hi(C_LABEL(doing_pdma)), %l7
>> 257 st %g0, [%l7 + %lo(C_LABEL(doing_pdma))]
>> 258
>> 259 /* fall through... */
>> 260 floppy_dosoftint:
>> 261 rd %wim, %l3
>> 262 SAVE_ALL
>> 263
>> 264 /* Set all IRQs off. */
>> 265 or %l0, PSR_PIL, %l4
>> 266 wr %l4, 0x0, %psr
>> 267 WRITE_PAUSE
>> 268 wr %l4, PSR_ET, %psr
>> 269 WRITE_PAUSE
>> 270
>> 271 mov 11, %o0 ! floppy irq level (unused anyway)
>> 272 mov %g0, %o1 ! devid is not used in fast interrupts
>> 273 call C_LABEL(sparc_floppy_irq)
>> 274 add %sp, STACKFRAME_SZ, %o2 ! struct pt_regs *regs
>> 275
>> 276 RESTORE_ALL
>> 277
>> 278 #endif /* (CONFIG_BLK_DEV_FD) */
>> 279
>> 280 /* Bad trap handler */
>> 281 .globl bad_trap_handler
>> 282 bad_trap_handler:
>> 283 SAVE_ALL
>> 284
>> 285 wr %l0, PSR_ET, %psr
>> 286 WRITE_PAUSE
>> 287
>> 288 mov %l7, %o0 ! trap number
>> 289 mov %l0, %o1 ! psr
>> 290 call C_LABEL(do_hw_interrupt)
>> 291 mov %l1, %o2 ! pc
>> 292
>> 293 RESTORE_ALL
>> 294
>> 295 /* For now all IRQ's not registered get sent here. handler_irq() will
>> 296 * see if a routine is registered to handle this interrupt and if not
>> 297 * it will say so on the console.
>> 298 */
>> 299
>> 300 .align 4
>> 301 .globl real_irq_entry, patch_handler_irq
>> 302 real_irq_entry:
>> 303 SAVE_ALL
>> 304
>> 305 #ifdef CONFIG_SMP
>> 306 .globl patchme_maybe_smp_msg
>> 307
>> 308 cmp %l7, 12
>> 309 patchme_maybe_smp_msg:
>> 310 bgu maybe_smp4m_msg
>> 311 nop
>> 312 #endif
>> 313
>> 314 real_irq_continue:
>> 315 or %l0, PSR_PIL, %g2
>> 316 wr %g2, 0x0, %psr
>> 317 WRITE_PAUSE
>> 318 wr %g2, PSR_ET, %psr
>> 319 WRITE_PAUSE
>> 320 mov %l7, %o0 ! irq level
>> 321 patch_handler_irq:
>> 322 call C_LABEL(handler_irq)
>> 323 add %sp, STACKFRAME_SZ, %o1 ! pt_regs ptr
>> 324 or %l0, PSR_PIL, %g2 ! restore PIL after handler_irq
>> 325 wr %g2, PSR_ET, %psr ! keep ET up
>> 326 WRITE_PAUSE
>> 327
>> 328 RESTORE_ALL
>> 329
>> 330 #ifdef CONFIG_SMP
>> 331 /* SMP per-cpu ticker interrupts are handled specially. */
>> 332 smp4m_ticker:
>> 333 bne real_irq_continue+4
>> 334 or %l0, PSR_PIL, %g2
>> 335 wr %g2, 0x0, %psr
>> 336 WRITE_PAUSE
>> 337 wr %g2, PSR_ET, %psr
>> 338 WRITE_PAUSE
>> 339 call C_LABEL(smp4m_percpu_timer_interrupt)
>> 340 add %sp, STACKFRAME_SZ, %o0
>> 341 wr %l0, PSR_ET, %psr
>> 342 WRITE_PAUSE
>> 343 RESTORE_ALL
>> 344
>> 345 /* Here is where we check for possible SMP IPI passed to us
>> 346 * on some level other than 15 which is the NMI and only used
>> 347 * for cross calls. That has a separate entry point below.
>> 348 */
>> 349 maybe_smp4m_msg:
>> 350 GET_PROCESSOR_MID(o3, o2)
>> 351 set C_LABEL(sun4m_interrupts), %l5
>> 352 ld [%l5], %o5
>> 353 sethi %hi(0x60000000), %o4
>> 354 sll %o3, 12, %o3
>> 355 ld [%o5 + %o3], %o1
>> 356 andcc %o1, %o4, %g0
>> 357 be,a smp4m_ticker
>> 358 cmp %l7, 14
>> 359 cmp %l7, 13
>> 360 add %o5, %o3, %o5
>> 361 bne,a 1f
>> 362 sethi %hi(0x40000000), %o2
>> 363 sethi %hi(0x20000000), %o2
>> 364 1:
>> 365 st %o2, [%o5 + 0x4]
>> 366 WRITE_PAUSE
>> 367 ld [%o5], %g0
>> 368 WRITE_PAUSE
>> 369 or %l0, PSR_PIL, %l4
>> 370 wr %l4, 0x0, %psr
>> 371 WRITE_PAUSE
>> 372 wr %l4, PSR_ET, %psr
>> 373 WRITE_PAUSE
>> 374 cmp %l7, 13
>> 375 bne 2f
>> 376 nop
>> 377 call C_LABEL(smp_reschedule_irq)
>> 378 add %o7, 8, %o7
>> 379 2:
>> 380 call C_LABEL(smp_stop_cpu_irq)
>> 381 nop
>> 382 RESTORE_ALL
>> 383
>> 384 .align 4
>> 385 .globl linux_trap_ipi15_sun4m
>> 386 linux_trap_ipi15_sun4m:
>> 387 SAVE_ALL
>> 388 sethi %hi(0x80000000), %o2
>> 389 GET_PROCESSOR_MID(o0, o1)
>> 390 set C_LABEL(sun4m_interrupts), %l5
>> 391 ld [%l5], %o5
>> 392 sll %o0, 12, %o0
>> 393 add %o5, %o0, %o5
>> 394 ld [%o5], %o3
>> 395 andcc %o3, %o2, %g0
>> 396 be 1f ! Must be an NMI async memory error
>> 397 st %o2, [%o5 + 4]
>> 398 WRITE_PAUSE
>> 399 ld [%o5], %g0
>> 400 WRITE_PAUSE
>> 401 or %l0, PSR_PIL, %l4
>> 402 wr %l4, 0x0, %psr
>> 403 WRITE_PAUSE
>> 404 wr %l4, PSR_ET, %psr
>> 405 WRITE_PAUSE
>> 406 call C_LABEL(smp4m_cross_call_irq)
>> 407 nop
>> 408 b ret_trap_lockless_ipi
>> 409 clr %l6
>> 410 1:
>> 411 /* NMI async memory error handling. */
>> 412 sethi %hi(0x80000000), %l4
>> 413 sethi %hi(0x4000), %o3
>> 414 sub %o5, %o0, %o5
>> 415 add %o5, %o3, %l5
>> 416 st %l4, [%l5 + 0xc]
>> 417 WRITE_PAUSE
>> 418 ld [%l5], %g0
>> 419 WRITE_PAUSE
>> 420 or %l0, PSR_PIL, %l4
>> 421 wr %l4, 0x0, %psr
>> 422 WRITE_PAUSE
>> 423 wr %l4, PSR_ET, %psr
>> 424 WRITE_PAUSE
>> 425 call C_LABEL(sun4m_nmi)
>> 426 nop
>> 427 st %l4, [%l5 + 0x8]
>> 428 WRITE_PAUSE
>> 429 ld [%l5], %g0
>> 430 WRITE_PAUSE
>> 431 RESTORE_ALL
>> 432
>> 433 .globl smp4d_ticker
>> 434 /* SMP per-cpu ticker interrupts are handled specially. */
>> 435 smp4d_ticker:
>> 436 SAVE_ALL
>> 437 or %l0, PSR_PIL, %g2
>> 438 sethi %hi(CC_ICLR), %o0
>> 439 sethi %hi(1 << 14), %o1
>> 440 or %o0, %lo(CC_ICLR), %o0
>> 441 stha %o1, [%o0] ASI_M_MXCC /* Clear PIL 14 in MXCC's ICLR */
>> 442 wr %g2, 0x0, %psr
>> 443 WRITE_PAUSE
>> 444 wr %g2, PSR_ET, %psr
>> 445 WRITE_PAUSE
>> 446 call C_LABEL(smp4d_percpu_timer_interrupt)
>> 447 add %sp, STACKFRAME_SZ, %o0
>> 448 wr %l0, PSR_ET, %psr
>> 449 WRITE_PAUSE
>> 450 RESTORE_ALL
>> 451
>> 452 .align 4
>> 453 .globl linux_trap_ipi15_sun4d
>> 454 linux_trap_ipi15_sun4d:
>> 455 SAVE_ALL
>> 456 sethi %hi(CC_BASE), %o4
>> 457 sethi %hi(MXCC_ERR_ME|MXCC_ERR_PEW|MXCC_ERR_ASE|MXCC_ERR_PEE), %o2
>> 458 or %o4, (CC_EREG - CC_BASE), %o0
>> 459 ldda [%o0] ASI_M_MXCC, %o0
>> 460 andcc %o0, %o2, %g0
>> 461 bne 1f
>> 462 sethi %hi(BB_STAT2), %o2
>> 463 lduba [%o2] ASI_M_CTL, %o2
>> 464 andcc %o2, BB_STAT2_MASK, %g0
>> 465 bne 2f
>> 466 or %o4, (CC_ICLR - CC_BASE), %o0
>> 467 sethi %hi(1 << 15), %o1
>> 468 stha %o1, [%o0] ASI_M_MXCC /* Clear PIL 15 in MXCC's ICLR */
>> 469 or %l0, PSR_PIL, %l4
>> 470 wr %l4, 0x0, %psr
>> 471 WRITE_PAUSE
>> 472 wr %l4, PSR_ET, %psr
>> 473 WRITE_PAUSE
>> 474 call C_LABEL(smp4d_cross_call_irq)
>> 475 nop
>> 476 b ret_trap_lockless_ipi
>> 477 clr %l6
>> 478
>> 479 1: /* MXCC error */
>> 480 2: /* BB error */
>> 481 /* Disable PIL 15 */
>> 482 set CC_IMSK, %l4
>> 483 lduha [%l4] ASI_M_MXCC, %l5
>> 484 sethi %hi(1 << 15), %l7
>> 485 or %l5, %l7, %l5
>> 486 stha %l5, [%l4] ASI_M_MXCC
>> 487 /* FIXME */
>> 488 1: b,a 1b
>> 489
>> 490 #endif /* CONFIG_SMP */
>> 491
>> 492 /* This routine handles illegal instructions and privileged
>> 493 * instruction attempts from user code.
>> 494 */
>> 495 .align 4
>> 496 .globl bad_instruction
>> 497 bad_instruction:
>> 498 sethi %hi(0xc1f80000), %l4
>> 499 ld [%l1], %l5
>> 500 sethi %hi(0x81d80000), %l7
>> 501 and %l5, %l4, %l5
>> 502 cmp %l5, %l7
>> 503 be 1f
>> 504 SAVE_ALL
>> 505
>> 506 wr %l0, PSR_ET, %psr ! re-enable traps
>> 507 WRITE_PAUSE
>> 508
>> 509 add %sp, STACKFRAME_SZ, %o0
>> 510 mov %l1, %o1
>> 511 mov %l2, %o2
>> 512 call C_LABEL(do_illegal_instruction)
>> 513 mov %l0, %o3
>> 514
>> 515 RESTORE_ALL
>> 516
>> 517 1: /* unimplemented flush - just skip */
>> 518 jmpl %l2, %g0
>> 519 rett %l2 + 4
>> 520
>> 521 .align 4
>> 522 .globl priv_instruction
>> 523 priv_instruction:
>> 524 SAVE_ALL
>> 525
>> 526 wr %l0, PSR_ET, %psr
>> 527 WRITE_PAUSE
>> 528
>> 529 add %sp, STACKFRAME_SZ, %o0
>> 530 mov %l1, %o1
>> 531 mov %l2, %o2
>> 532 call C_LABEL(do_priv_instruction)
>> 533 mov %l0, %o3
>> 534
>> 535 RESTORE_ALL
>> 536
>> 537 /* This routine handles unaligned data accesses. */
>> 538 .align 4
>> 539 .globl mna_handler
>> 540 mna_handler:
>> 541 andcc %l0, PSR_PS, %g0
>> 542 be mna_fromuser
>> 543 nop
>> 544
>> 545 SAVE_ALL
>> 546
>> 547 wr %l0, PSR_ET, %psr
>> 548 WRITE_PAUSE
>> 549
>> 550 ld [%l1], %o1
>> 551 call C_LABEL(kernel_unaligned_trap)
>> 552 add %sp, STACKFRAME_SZ, %o0
>> 553
>> 554 RESTORE_ALL
>> 555
>> 556 mna_fromuser:
>> 557 SAVE_ALL
>> 558
>> 559 wr %l0, PSR_ET, %psr ! re-enable traps
>> 560 WRITE_PAUSE
>> 561
>> 562 ld [%l1], %o1
>> 563 call C_LABEL(user_unaligned_trap)
>> 564 add %sp, STACKFRAME_SZ, %o0
>> 565
>> 566 RESTORE_ALL
>> 567
>> 568 /* This routine handles floating point disabled traps. */
>> 569 .align 4
>> 570 .globl fpd_trap_handler
>> 571 fpd_trap_handler:
>> 572 SAVE_ALL
>> 573
>> 574 wr %l0, PSR_ET, %psr ! re-enable traps
>> 575 WRITE_PAUSE
>> 576
>> 577 add %sp, STACKFRAME_SZ, %o0
>> 578 mov %l1, %o1
>> 579 mov %l2, %o2
>> 580 call C_LABEL(do_fpd_trap)
>> 581 mov %l0, %o3
>> 582
>> 583 RESTORE_ALL
>> 584
>> 585 /* This routine handles Floating Point Exceptions. */
>> 586 .align 4
>> 587 .globl fpe_trap_handler
>> 588 fpe_trap_handler:
>> 589 set fpsave_magic, %l5
>> 590 cmp %l1, %l5
>> 591 be 1f
>> 592 sethi %hi(C_LABEL(fpsave)), %l5
>> 593 or %l5, %lo(C_LABEL(fpsave)), %l5
>> 594 cmp %l1, %l5
>> 595 bne 2f
>> 596 sethi %hi(fpsave_catch2), %l5
>> 597 or %l5, %lo(fpsave_catch2), %l5
>> 598 wr %l0, 0x0, %psr
>> 599 WRITE_PAUSE
>> 600 jmp %l5
>> 601 rett %l5 + 4
>> 602 1:
>> 603 sethi %hi(fpsave_catch), %l5
>> 604 or %l5, %lo(fpsave_catch), %l5
>> 605 wr %l0, 0x0, %psr
>> 606 WRITE_PAUSE
>> 607 jmp %l5
>> 608 rett %l5 + 4
>> 609
>> 610 2:
>> 611 SAVE_ALL
>> 612
>> 613 wr %l0, PSR_ET, %psr ! re-enable traps
>> 614 WRITE_PAUSE
>> 615
>> 616 add %sp, STACKFRAME_SZ, %o0
>> 617 mov %l1, %o1
>> 618 mov %l2, %o2
>> 619 call C_LABEL(do_fpe_trap)
>> 620 mov %l0, %o3
>> 621
>> 622 RESTORE_ALL
>> 623
>> 624 /* This routine handles Tag Overflow Exceptions. */
>> 625 .align 4
>> 626 .globl do_tag_overflow
>> 627 do_tag_overflow:
>> 628 SAVE_ALL
>> 629
>> 630 wr %l0, PSR_ET, %psr ! re-enable traps
>> 631 WRITE_PAUSE
>> 632
>> 633 add %sp, STACKFRAME_SZ, %o0
>> 634 mov %l1, %o1
>> 635 mov %l2, %o2
>> 636 call C_LABEL(handle_tag_overflow)
>> 637 mov %l0, %o3
>> 638
>> 639 RESTORE_ALL
>> 640
>> 641 /* This routine handles Watchpoint Exceptions. */
>> 642 .align 4
>> 643 .globl do_watchpoint
>> 644 do_watchpoint:
>> 645 SAVE_ALL
>> 646
>> 647 wr %l0, PSR_ET, %psr ! re-enable traps
>> 648 WRITE_PAUSE
>> 649
>> 650 add %sp, STACKFRAME_SZ, %o0
>> 651 mov %l1, %o1
>> 652 mov %l2, %o2
>> 653 call C_LABEL(handle_watchpoint)
>> 654 mov %l0, %o3
>> 655
>> 656 RESTORE_ALL
>> 657
>> 658 /* This routine handles Register Access Exceptions. */
>> 659 .align 4
>> 660 .globl do_reg_access
>> 661 do_reg_access:
>> 662 SAVE_ALL
>> 663
>> 664 wr %l0, PSR_ET, %psr ! re-enable traps
>> 665 WRITE_PAUSE
>> 666
>> 667 add %sp, STACKFRAME_SZ, %o0
>> 668 mov %l1, %o1
>> 669 mov %l2, %o2
>> 670 call C_LABEL(handle_reg_access)
>> 671 mov %l0, %o3
>> 672
>> 673 RESTORE_ALL
>> 674
>> 675 /* This routine handles Co-Processor Disabled Exceptions. */
>> 676 .align 4
>> 677 .globl do_cp_disabled
>> 678 do_cp_disabled:
>> 679 SAVE_ALL
>> 680
>> 681 wr %l0, PSR_ET, %psr ! re-enable traps
>> 682 WRITE_PAUSE
>> 683
>> 684 add %sp, STACKFRAME_SZ, %o0
>> 685 mov %l1, %o1
>> 686 mov %l2, %o2
>> 687 call C_LABEL(handle_cp_disabled)
>> 688 mov %l0, %o3
>> 689
>> 690 RESTORE_ALL
>> 691
>> 692 /* This routine handles Co-Processor Exceptions. */
>> 693 .align 4
>> 694 .globl do_cp_exception
>> 695 do_cp_exception:
>> 696 SAVE_ALL
>> 697
>> 698 wr %l0, PSR_ET, %psr ! re-enable traps
>> 699 WRITE_PAUSE
>> 700
>> 701 add %sp, STACKFRAME_SZ, %o0
>> 702 mov %l1, %o1
>> 703 mov %l2, %o2
>> 704 call C_LABEL(handle_cp_exception)
>> 705 mov %l0, %o3
>> 706
>> 707 RESTORE_ALL
>> 708
>> 709 /* This routine handles Hardware Divide By Zero Exceptions. */
>> 710 .align 4
>> 711 .globl do_hw_divzero
>> 712 do_hw_divzero:
>> 713 SAVE_ALL
>> 714
>> 715 wr %l0, PSR_ET, %psr ! re-enable traps
>> 716 WRITE_PAUSE
>> 717
>> 718 add %sp, STACKFRAME_SZ, %o0
>> 719 mov %l1, %o1
>> 720 mov %l2, %o2
>> 721 call C_LABEL(handle_hw_divzero)
>> 722 mov %l0, %o3
>> 723
>> 724 RESTORE_ALL
>> 725
>> 726 .align 4
>> 727 .globl do_flush_windows
>> 728 do_flush_windows:
>> 729 SAVE_ALL
>> 730
>> 731 wr %l0, PSR_ET, %psr
>> 732 WRITE_PAUSE
>> 733
>> 734 andcc %l0, PSR_PS, %g0
>> 735 bne dfw_kernel
>> 736 nop
>> 737
>> 738 call C_LABEL(flush_user_windows)
>> 739 nop
>> 740
>> 741 /* Advance over the trap instruction. */
>> 742 ld [%sp + STACKFRAME_SZ + PT_NPC], %l1
>> 743 add %l1, 0x4, %l2
>> 744 st %l1, [%sp + STACKFRAME_SZ + PT_PC]
>> 745 st %l2, [%sp + STACKFRAME_SZ + PT_NPC]
>> 746
>> 747 RESTORE_ALL
>> 748
>> 749 .globl flush_patch_one
>> 750
>> 751 /* We get these for debugging routines using __builtin_return_address() */
>> 752 dfw_kernel:
>> 753 flush_patch_one:
>> 754 FLUSH_ALL_KERNEL_WINDOWS
>> 755
>> 756 /* Advance over the trap instruction. */
>> 757 ld [%sp + STACKFRAME_SZ + PT_NPC], %l1
>> 758 add %l1, 0x4, %l2
>> 759 st %l1, [%sp + STACKFRAME_SZ + PT_PC]
>> 760 st %l2, [%sp + STACKFRAME_SZ + PT_NPC]
>> 761
>> 762 RESTORE_ALL
>> 763
>> 764 /* The getcc software trap. The user wants the condition codes from
>> 765 * the %psr in register %g1.
>> 766 */
>> 767
>> 768 .align 4
>> 769 .globl getcc_trap_handler
>> 770 getcc_trap_handler:
>> 771 srl %l0, 20, %g1 ! give user
>> 772 and %g1, 0xf, %g1 ! only ICC bits in %psr
>> 773 jmp %l2 ! advance over trap instruction
>> 774 rett %l2 + 0x4 ! like this...
>> 775
>> 776 /* The setcc software trap. The user has condition codes in %g1
>> 777 * that it would like placed in the %psr. Be careful not to flip
>> 778 * any unintentional bits!
>> 779 */
>> 780
>> 781 .align 4
>> 782 .globl setcc_trap_handler
>> 783 setcc_trap_handler:
>> 784 sll %g1, 0x14, %l4
>> 785 set PSR_ICC, %l5
>> 786 andn %l0, %l5, %l0 ! clear ICC bits in %psr
>> 787 and %l4, %l5, %l4 ! clear non-ICC bits in user value
>> 788 or %l4, %l0, %l4 ! or them in... mix mix mix
>> 789
>> 790 wr %l4, 0x0, %psr ! set new %psr
>> 791 WRITE_PAUSE ! TI scumbags...
>> 792
>> 793 jmp %l2 ! advance over trap instruction
>> 794 rett %l2 + 0x4 ! like this...
>> 795
>> 796 .align 4
>> 797 .globl linux_trap_nmi_sun4c
>> 798 linux_trap_nmi_sun4c:
>> 799 SAVE_ALL
>> 800
>> 801 /* Ugh, we need to clear the IRQ line. This is now
>> 802 * a very sun4c specific trap handler...
>> 803 */
>> 804 sethi %hi(C_LABEL(interrupt_enable)), %l5
>> 805 ld [%l5 + %lo(C_LABEL(interrupt_enable))], %l5
>> 806 ldub [%l5], %l6
>> 807 andn %l6, INTS_ENAB, %l6
>> 808 stb %l6, [%l5]
>> 809
>> 810 /* Now it is safe to re-enable traps without recursion. */
>> 811 or %l0, PSR_PIL, %l0
>> 812 wr %l0, PSR_ET, %psr
>> 813 WRITE_PAUSE
>> 814
>> 815 /* Now call the c-code with the pt_regs frame ptr and the
>> 816 * memory error registers as arguments. The ordering chosen
>> 817 * here is due to unlatching semantics.
>> 818 */
>> 819 sethi %hi(AC_SYNC_ERR), %o0
>> 820 add %o0, 0x4, %o0
>> 821 lda [%o0] ASI_CONTROL, %o2 ! sync vaddr
>> 822 sub %o0, 0x4, %o0
>> 823 lda [%o0] ASI_CONTROL, %o1 ! sync error
>> 824 add %o0, 0xc, %o0
>> 825 lda [%o0] ASI_CONTROL, %o4 ! async vaddr
>> 826 sub %o0, 0x4, %o0
>> 827 lda [%o0] ASI_CONTROL, %o3 ! async error
>> 828 call C_LABEL(sparc_lvl15_nmi)
>> 829 add %sp, STACKFRAME_SZ, %o0
>> 830
>> 831 RESTORE_ALL
>> 832
>> 833 .align 4
>> 834 .globl C_LABEL(invalid_segment_patch1_ff)
>> 835 .globl C_LABEL(invalid_segment_patch2_ff)
>> 836 C_LABEL(invalid_segment_patch1_ff): cmp %l4, 0xff
>> 837 C_LABEL(invalid_segment_patch2_ff): mov 0xff, %l3
>> 838
>> 839 .align 4
>> 840 .globl C_LABEL(invalid_segment_patch1_1ff)
>> 841 .globl C_LABEL(invalid_segment_patch2_1ff)
>> 842 C_LABEL(invalid_segment_patch1_1ff): cmp %l4, 0x1ff
>> 843 C_LABEL(invalid_segment_patch2_1ff): mov 0x1ff, %l3
>> 844
>> 845 .align 4
>> 846 .globl C_LABEL(num_context_patch1_16), C_LABEL(num_context_patch2_16)
>> 847 C_LABEL(num_context_patch1_16): mov 0x10, %l7
>> 848 C_LABEL(num_context_patch2_16): mov 0x10, %l7
>> 849
>> 850 .align 4
>> 851 .globl C_LABEL(vac_linesize_patch_32)
>> 852 C_LABEL(vac_linesize_patch_32): subcc %l7, 32, %l7
>> 853
>> 854 .align 4
>> 855 .globl C_LABEL(vac_hwflush_patch1_on), C_LABEL(vac_hwflush_patch2_on)
>> 856
37 /* 857 /*
38 * We can be coming here from a syscall done i !! 858 * Ugly, but we cant use hardware flushing on the sun4 and we'd require
39 * e.g. a failed kernel_execve(). !! 859 * two instructions (Anton)
40 */ 860 */
41 resume_userspace_check: !! 861 #ifdef CONFIG_SUN4
42 LONG_L t0, PT_STATUS(sp) !! 862 C_LABEL(vac_hwflush_patch1_on): nop
43 andi t0, t0, KU_USER !! 863 #else
44 beqz t0, resume_kernel !! 864 C_LABEL(vac_hwflush_patch1_on): addcc %l7, -PAGE_SIZE, %l7
45 !! 865 #endif
46 resume_userspace: !! 866
47 local_irq_disable # make !! 867 C_LABEL(vac_hwflush_patch2_on): sta %g0, [%l3 + %l7] ASI_HWFLUSHSEG
48 # inte !! 868
49 # betw !! 869 .globl C_LABEL(invalid_segment_patch1), C_LABEL(invalid_segment_patch2)
50 LONG_L a2, TI_FLAGS($28) # curr !! 870 .globl C_LABEL(num_context_patch1), C_LABEL(num_context_patch2)
51 andi t0, a2, _TIF_WORK_MASK # (ign !! 871 .globl C_LABEL(vac_linesize_patch), C_LABEL(vac_hwflush_patch1)
52 bnez t0, work_pending !! 872 .globl C_LABEL(vac_hwflush_patch2)
53 j restore_all !! 873
54 !! 874 .align 4
55 #ifdef CONFIG_PREEMPTION !! 875 .globl sun4c_fault
56 resume_kernel: !! 876
57 local_irq_disable !! 877 ! %l0 = %psr
58 lw t0, TI_PRE_COUNT($28) !! 878 ! %l1 = %pc
59 bnez t0, restore_all !! 879 ! %l2 = %npc
60 LONG_L t0, TI_FLAGS($28) !! 880 ! %l3 = %wim
61 andi t1, t0, _TIF_NEED_RESCHED !! 881 ! %l7 = 1 for textfault
62 beqz t1, restore_all !! 882 ! We want error in %l5, vaddr in %l6
63 LONG_L t0, PT_STATUS(sp) !! 883 sun4c_fault:
64 andi t0, 1 !! 884 #ifdef CONFIG_SUN4
65 beqz t0, restore_all !! 885 sethi %hi(C_LABEL(sun4c_memerr_reg)), %l4
66 PTR_LA ra, restore_all !! 886 ld [%l4+%lo(C_LABEL(sun4c_memerr_reg))], %l4 ! memerr ctrl reg addr
67 j preempt_schedule_irq !! 887 ld [%l4], %l6 ! memerr ctrl reg
68 #endif !! 888 ld [%l4 + 4], %l5 ! memerr vaddr reg
69 !! 889 andcc %l6, 0x80, %g0 ! check for error type
70 FEXPORT(ret_from_kernel_thread) !! 890 st %g0, [%l4 + 4] ! clear the error
71 jal schedule_tail # a0 = !! 891 be 0f ! normal error
72 move a0, s1 !! 892 sethi %hi(AC_BUS_ERROR), %l4 ! bus err reg addr
73 jal s0 !! 893
74 j syscall_exit !! 894 call C_LABEL(prom_halt) ! something weird happened
75 !! 895 ! what exactly did happen?
76 FEXPORT(ret_from_fork) !! 896 ! what should we do here?
77 jal schedule_tail # a0 = !! 897
78 !! 898 0: or %l4, %lo(AC_BUS_ERROR), %l4 ! bus err reg addr
79 FEXPORT(syscall_exit) !! 899 lduba [%l4] ASI_CONTROL, %l6 ! bus err reg
80 #ifdef CONFIG_DEBUG_RSEQ !! 900
81 move a0, sp !! 901 cmp %l7, 1 ! text fault?
82 jal rseq_syscall !! 902 be 1f ! yes
83 #endif !! 903 nop
84 local_irq_disable # make !! 904
85 # sign !! 905 ld [%l1], %l4 ! load instruction that caused fault
86 # samp !! 906 srl %l4, 21, %l4
87 LONG_L a2, TI_FLAGS($28) # curr !! 907 andcc %l4, 1, %g0 ! store instruction?
88 li t0, _TIF_ALLWORK_MASK !! 908
89 and t0, a2, t0 !! 909 be 1f ! no
90 bnez t0, syscall_exit_work !! 910 sethi %hi(SUN4C_SYNC_BADWRITE), %l4 ! yep
91 !! 911 ! %lo(SUN4C_SYNC_BADWRITE) = 0
92 restore_all: # rest !! 912 or %l4, %l6, %l6 ! set write bit to emulate sun4c
93 .set noat !! 913 1:
94 RESTORE_TEMP !! 914 #else
95 RESTORE_AT !! 915 sethi %hi(AC_SYNC_ERR), %l4
96 RESTORE_STATIC !! 916 add %l4, 0x4, %l6 ! AC_SYNC_VA in %l6
97 restore_partial: # restore part !! 917 lda [%l6] ASI_CONTROL, %l5 ! Address
98 #ifdef CONFIG_TRACE_IRQFLAGS !! 918 lda [%l4] ASI_CONTROL, %l6 ! Error, retained for a bit
99 SAVE_STATIC !! 919 #endif
100 SAVE_AT !! 920
101 SAVE_TEMP !! 921 andn %l5, 0xfff, %l5 ! Encode all info into l7
102 LONG_L v0, PT_STATUS(sp) !! 922 srl %l6, 14, %l4
103 #if defined(CONFIG_CPU_R3000) !! 923
104 and v0, ST0_IEP !! 924 and %l4, 2, %l4
>> 925 or %l5, %l4, %l4
>> 926
>> 927 or %l4, %l7, %l7 ! l7 = [addr,write,txtfault]
>> 928
>> 929 andcc %l0, PSR_PS, %g0
>> 930 be sun4c_fault_fromuser
>> 931 andcc %l7, 1, %g0 ! Text fault?
>> 932
>> 933 be 1f
>> 934 sethi %hi(KERNBASE), %l4
>> 935
>> 936 mov %l1, %l5 ! PC
>> 937
>> 938 1:
>> 939 cmp %l5, %l4
>> 940 blu sun4c_fault_fromuser
>> 941 sethi %hi(~((1 << SUN4C_REAL_PGDIR_SHIFT) - 1)), %l4
>> 942
>> 943 /* If the kernel references a bum kernel pointer, or a pte which
>> 944 * points to a non existant page in ram, we will run this code
>> 945 * _forever_ and lock up the machine!!!!! So we must check for
>> 946 * this condition, the AC_SYNC_ERR bits are what we must examine.
>> 947 * Also a parity error would make this happen as well. So we just
>> 948 * check that we are in fact servicing a tlb miss and not some
>> 949 * other type of fault for the kernel.
>> 950 */
>> 951 andcc %l6, 0x80, %g0
>> 952 be sun4c_fault_fromuser
>> 953 and %l5, %l4, %l5
>> 954
>> 955 /* Test for NULL pte_t * in vmalloc area. */
>> 956 sethi %hi(VMALLOC_START), %l4
>> 957 cmp %l5, %l4
>> 958 blu,a C_LABEL(invalid_segment_patch1)
>> 959 lduXa [%l5] ASI_SEGMAP, %l4
>> 960
>> 961 sethi %hi(C_LABEL(swapper_pg_dir)), %l4
>> 962 srl %l5, SUN4C_PGDIR_SHIFT, %l6
>> 963 or %l4, %lo(C_LABEL(swapper_pg_dir)), %l4
>> 964 sll %l6, 2, %l6
>> 965 ld [%l4 + %l6], %l4
>> 966 #ifdef CONFIG_SUN4
>> 967 sethi %hi(PAGE_MASK), %l6
>> 968 andcc %l4, %l6, %g0
>> 969 #else
>> 970 andcc %l4, PAGE_MASK, %g0
>> 971 #endif
>> 972 be sun4c_fault_fromuser
>> 973 lduXa [%l5] ASI_SEGMAP, %l4
>> 974
>> 975 C_LABEL(invalid_segment_patch1):
>> 976 cmp %l4, 0x7f
>> 977 bne 1f
>> 978 sethi %hi(C_LABEL(sun4c_kfree_ring)), %l4
>> 979 or %l4, %lo(C_LABEL(sun4c_kfree_ring)), %l4
>> 980 ld [%l4 + 0x18], %l3
>> 981 deccc %l3 ! do we have a free entry?
>> 982 bcs,a 2f ! no, unmap one.
>> 983 sethi %hi(C_LABEL(sun4c_kernel_ring)), %l4
>> 984
>> 985 st %l3, [%l4 + 0x18] ! sun4c_kfree_ring.num_entries--
>> 986
>> 987 ld [%l4 + 0x00], %l6 ! entry = sun4c_kfree_ring.ringhd.next
>> 988 st %l5, [%l6 + 0x08] ! entry->vaddr = address
>> 989
>> 990 ld [%l6 + 0x00], %l3 ! next = entry->next
>> 991 ld [%l6 + 0x04], %l7 ! entry->prev
>> 992
>> 993 st %l7, [%l3 + 0x04] ! next->prev = entry->prev
>> 994 st %l3, [%l7 + 0x00] ! entry->prev->next = next
>> 995
>> 996 sethi %hi(C_LABEL(sun4c_kernel_ring)), %l4
>> 997 or %l4, %lo(C_LABEL(sun4c_kernel_ring)), %l4
>> 998 ! head = &sun4c_kernel_ring.ringhd
>> 999
>> 1000 ld [%l4 + 0x00], %l7 ! head->next
>> 1001
>> 1002 st %l4, [%l6 + 0x04] ! entry->prev = head
>> 1003 st %l7, [%l6 + 0x00] ! entry->next = head->next
>> 1004 st %l6, [%l7 + 0x04] ! head->next->prev = entry
>> 1005
>> 1006 st %l6, [%l4 + 0x00] ! head->next = entry
>> 1007
>> 1008 ld [%l4 + 0x18], %l3
>> 1009 inc %l3 ! sun4c_kernel_ring.num_entries++
>> 1010 st %l3, [%l4 + 0x18]
>> 1011 b 4f
>> 1012 ld [%l6 + 0x08], %l5
>> 1013
>> 1014 2:
>> 1015 or %l4, %lo(C_LABEL(sun4c_kernel_ring)), %l4
>> 1016 ! head = &sun4c_kernel_ring.ringhd
>> 1017
>> 1018 ld [%l4 + 0x04], %l6 ! entry = head->prev
>> 1019
>> 1020 ld [%l6 + 0x08], %l3 ! tmp = entry->vaddr
>> 1021
>> 1022 ! Flush segment from the cache.
>> 1023 #ifdef CONFIG_SUN4
>> 1024 sethi %hi((128 * 1024)), %l7
105 #else 1025 #else
106 and v0, ST0_IE !! 1026 sethi %hi((64 * 1024)), %l7
>> 1027 #endif
>> 1028 9:
>> 1029 C_LABEL(vac_hwflush_patch1):
>> 1030 C_LABEL(vac_linesize_patch):
>> 1031 subcc %l7, 16, %l7
>> 1032 bne 9b
>> 1033 C_LABEL(vac_hwflush_patch2):
>> 1034 sta %g0, [%l3 + %l7] ASI_FLUSHSEG
>> 1035
>> 1036 st %l5, [%l6 + 0x08] ! entry->vaddr = address
>> 1037
>> 1038 ld [%l6 + 0x00], %l5 ! next = entry->next
>> 1039 ld [%l6 + 0x04], %l7 ! entry->prev
>> 1040
>> 1041 st %l7, [%l5 + 0x04] ! next->prev = entry->prev
>> 1042 st %l5, [%l7 + 0x00] ! entry->prev->next = next
>> 1043 st %l4, [%l6 + 0x04] ! entry->prev = head
>> 1044
>> 1045 ld [%l4 + 0x00], %l7 ! head->next
>> 1046
>> 1047 st %l7, [%l6 + 0x00] ! entry->next = head->next
>> 1048 st %l6, [%l7 + 0x04] ! head->next->prev = entry
>> 1049 st %l6, [%l4 + 0x00] ! head->next = entry
>> 1050
>> 1051 mov %l3, %l5 ! address = tmp
>> 1052
>> 1053 4:
>> 1054 C_LABEL(num_context_patch1):
>> 1055 mov 0x08, %l7
>> 1056
>> 1057 ld [%l6 + 0x08], %l4
>> 1058 ldub [%l6 + 0x0c], %l3
>> 1059 or %l4, %l3, %l4 ! encode new vaddr/pseg into l4
>> 1060
>> 1061 sethi %hi(AC_CONTEXT), %l3
>> 1062 lduba [%l3] ASI_CONTROL, %l6
>> 1063
>> 1064 /* Invalidate old mapping, instantiate new mapping,
>> 1065 * for each context. Registers l6/l7 are live across
>> 1066 * this loop.
>> 1067 */
>> 1068 3: deccc %l7
>> 1069 sethi %hi(AC_CONTEXT), %l3
>> 1070 stba %l7, [%l3] ASI_CONTROL
>> 1071 C_LABEL(invalid_segment_patch2):
>> 1072 mov 0x7f, %l3
>> 1073 stXa %l3, [%l5] ASI_SEGMAP
>> 1074 andn %l4, 0x1ff, %l3
>> 1075 bne 3b
>> 1076 stXa %l4, [%l3] ASI_SEGMAP
>> 1077
>> 1078 sethi %hi(AC_CONTEXT), %l3
>> 1079 stba %l6, [%l3] ASI_CONTROL
>> 1080
>> 1081 andn %l4, 0x1ff, %l5
>> 1082
>> 1083 1:
>> 1084 sethi %hi(VMALLOC_START), %l4
>> 1085 cmp %l5, %l4
>> 1086
>> 1087 bgeu 1f
>> 1088 mov 1 << (SUN4C_REAL_PGDIR_SHIFT - PAGE_SHIFT), %l7
>> 1089
>> 1090 sethi %hi(KERNBASE), %l6
>> 1091
>> 1092 sub %l5, %l6, %l4
>> 1093 srl %l4, PAGE_SHIFT, %l4
>> 1094 sethi %hi((SUN4C_PAGE_KERNEL & 0xf4000000)), %l3
>> 1095 or %l3, %l4, %l3
>> 1096
>> 1097 sethi %hi(PAGE_SIZE), %l4
>> 1098
>> 1099 2:
>> 1100 sta %l3, [%l5] ASI_PTE
>> 1101 deccc %l7
>> 1102 inc %l3
>> 1103 bne 2b
>> 1104 add %l5, %l4, %l5
>> 1105
>> 1106 b 7f
>> 1107 sethi %hi(C_LABEL(sun4c_kernel_faults)), %l4
>> 1108
>> 1109 1:
>> 1110 srl %l5, SUN4C_PGDIR_SHIFT, %l3
>> 1111 sethi %hi(C_LABEL(swapper_pg_dir)), %l4
>> 1112 or %l4, %lo(C_LABEL(swapper_pg_dir)), %l4
>> 1113 sll %l3, 2, %l3
>> 1114 ld [%l4 + %l3], %l4
>> 1115 #ifndef CONFIG_SUN4
>> 1116 and %l4, PAGE_MASK, %l4
>> 1117 #else
>> 1118 sethi %hi(PAGE_MASK), %l6
>> 1119 and %l4, %l6, %l4
>> 1120 #endif
>> 1121
>> 1122 srl %l5, (PAGE_SHIFT - 2), %l6
>> 1123 and %l6, ((SUN4C_PTRS_PER_PTE - 1) << 2), %l6
>> 1124 add %l6, %l4, %l6
>> 1125
>> 1126 sethi %hi(PAGE_SIZE), %l4
>> 1127
>> 1128 2:
>> 1129 ld [%l6], %l3
>> 1130 deccc %l7
>> 1131 sta %l3, [%l5] ASI_PTE
>> 1132 add %l6, 0x4, %l6
>> 1133 bne 2b
>> 1134 add %l5, %l4, %l5
>> 1135
>> 1136 sethi %hi(C_LABEL(sun4c_kernel_faults)), %l4
>> 1137 7:
>> 1138 ld [%l4 + %lo(C_LABEL(sun4c_kernel_faults))], %l3
>> 1139 inc %l3
>> 1140 st %l3, [%l4 + %lo(C_LABEL(sun4c_kernel_faults))]
>> 1141
>> 1142 /* Restore condition codes */
>> 1143 wr %l0, 0x0, %psr
>> 1144 WRITE_PAUSE
>> 1145 jmp %l1
>> 1146 rett %l2
>> 1147
>> 1148 sun4c_fault_fromuser:
>> 1149 SAVE_ALL
>> 1150 nop
>> 1151
>> 1152 mov %l7, %o1 ! Decode the info from %l7
>> 1153 mov %l7, %o2
>> 1154 and %o1, 1, %o1 ! arg2 = text_faultp
>> 1155 mov %l7, %o3
>> 1156 and %o2, 2, %o2 ! arg3 = writep
>> 1157 andn %o3, 0xfff, %o3 ! arg4 = faulting address
>> 1158
>> 1159 wr %l0, PSR_ET, %psr
>> 1160 WRITE_PAUSE
>> 1161
>> 1162 call C_LABEL(do_sun4c_fault)
>> 1163 add %sp, STACKFRAME_SZ, %o0 ! arg1 = pt_regs ptr
>> 1164
>> 1165 RESTORE_ALL
>> 1166
>> 1167 .align 4
>> 1168 .globl C_LABEL(srmmu_fault)
>> 1169 C_LABEL(srmmu_fault):
>> 1170 mov 0x400, %l5
>> 1171 mov 0x300, %l4
>> 1172
>> 1173 lda [%l5] ASI_M_MMUREGS, %l6 ! read sfar first
>> 1174 lda [%l4] ASI_M_MMUREGS, %l5 ! read sfsr last
>> 1175
>> 1176 andn %l6, 0xfff, %l6
>> 1177 srl %l5, 6, %l5 ! and encode all info into l7
>> 1178
>> 1179 and %l5, 2, %l5
>> 1180 or %l5, %l6, %l6
>> 1181
>> 1182 or %l6, %l7, %l7 ! l7 = [addr,write,txtfault]
>> 1183
>> 1184 SAVE_ALL
>> 1185
>> 1186 mov %l7, %o1
>> 1187 mov %l7, %o2
>> 1188 and %o1, 1, %o1 ! arg2 = text_faultp
>> 1189 mov %l7, %o3
>> 1190 and %o2, 2, %o2 ! arg3 = writep
>> 1191 andn %o3, 0xfff, %o3 ! arg4 = faulting address
>> 1192
>> 1193 wr %l0, PSR_ET, %psr
>> 1194 WRITE_PAUSE
>> 1195
>> 1196 call C_LABEL(do_sparc_fault)
>> 1197 add %sp, STACKFRAME_SZ, %o0 ! arg1 = pt_regs ptr
>> 1198
>> 1199 RESTORE_ALL
>> 1200
>> 1201 #ifdef CONFIG_SUNOS_EMUL
>> 1202 /* SunOS uses syscall zero as the 'indirect syscall' it looks
>> 1203 * like indir_syscall(scall_num, arg0, arg1, arg2...); etc.
>> 1204 * This is complete brain damage.
>> 1205 */
>> 1206 .globl C_LABEL(sunos_indir)
>> 1207 C_LABEL(sunos_indir):
>> 1208 mov %o7, %l4
>> 1209 cmp %o0, NR_SYSCALLS
>> 1210 blu,a 1f
>> 1211 sll %o0, 0x2, %o0
>> 1212
>> 1213 sethi %hi(C_LABEL(sunos_nosys)), %l6
>> 1214 b 2f
>> 1215 or %l6, %lo(C_LABEL(sunos_nosys)), %l6
>> 1216
>> 1217 1:
>> 1218 set C_LABEL(sunos_sys_table), %l7
>> 1219 ld [%l7 + %o0], %l6
>> 1220
>> 1221 2:
>> 1222 mov %o1, %o0
>> 1223 mov %o2, %o1
>> 1224 mov %o3, %o2
>> 1225 mov %o4, %o3
>> 1226 mov %o5, %o4
>> 1227 call %l6
>> 1228 mov %l4, %o7
107 #endif 1229 #endif
108 beqz v0, 1f !! 1230
109 jal trace_hardirqs_on !! 1231 .align 4
>> 1232 .globl C_LABEL(sys_nis_syscall)
>> 1233 C_LABEL(sys_nis_syscall):
>> 1234 mov %o7, %l5
>> 1235 add %sp, STACKFRAME_SZ, %o0 ! pt_regs *regs arg
>> 1236 call C_LABEL(c_sys_nis_syscall)
>> 1237 mov %l5, %o7
>> 1238
>> 1239 .align 4
>> 1240 .globl C_LABEL(sys_ptrace)
>> 1241 C_LABEL(sys_ptrace):
>> 1242 call C_LABEL(do_ptrace)
>> 1243 add %sp, STACKFRAME_SZ, %o0
>> 1244
>> 1245 ld [%curptr + AOFF_task_ptrace], %l5
>> 1246 andcc %l5, 0x02, %g0
>> 1247 be 1f
>> 1248 nop
>> 1249
>> 1250 call C_LABEL(syscall_trace)
>> 1251 nop
>> 1252
>> 1253 1:
>> 1254 RESTORE_ALL
>> 1255
>> 1256 .align 4
>> 1257 .globl C_LABEL(sys_execve)
>> 1258 C_LABEL(sys_execve):
>> 1259 mov %o7, %l5
>> 1260 add %sp, STACKFRAME_SZ, %o0 ! pt_regs *regs arg
>> 1261 call C_LABEL(sparc_execve)
>> 1262 mov %l5, %o7
>> 1263
>> 1264 .align 4
>> 1265 .globl C_LABEL(sys_pipe)
>> 1266 C_LABEL(sys_pipe):
>> 1267 mov %o7, %l5
>> 1268 add %sp, STACKFRAME_SZ, %o0 ! pt_regs *regs arg
>> 1269 call C_LABEL(sparc_pipe)
>> 1270 mov %l5, %o7
>> 1271
>> 1272 .align 4
>> 1273 .globl C_LABEL(sys_sigaltstack)
>> 1274 C_LABEL(sys_sigaltstack):
>> 1275 mov %o7, %l5
>> 1276 mov %fp, %o2
>> 1277 call C_LABEL(do_sigaltstack)
>> 1278 mov %l5, %o7
>> 1279
>> 1280 .align 4
>> 1281 .globl C_LABEL(sys_sigstack)
>> 1282 C_LABEL(sys_sigstack):
>> 1283 mov %o7, %l5
>> 1284 mov %fp, %o2
>> 1285 call C_LABEL(do_sys_sigstack)
>> 1286 mov %l5, %o7
>> 1287
>> 1288 .align 4
>> 1289 .globl C_LABEL(sys_sigpause)
>> 1290 C_LABEL(sys_sigpause):
>> 1291 /* Note: %o0 already has correct value... */
>> 1292 call C_LABEL(do_sigpause)
>> 1293 add %sp, STACKFRAME_SZ, %o1
>> 1294
>> 1295 ld [%curptr + AOFF_task_ptrace], %l5
>> 1296 andcc %l5, 0x02, %g0
>> 1297 be 1f
>> 1298 nop
>> 1299
>> 1300 call C_LABEL(syscall_trace)
>> 1301 nop
>> 1302
>> 1303 1:
>> 1304 /* We are returning to a signal handler. */
>> 1305 RESTORE_ALL
>> 1306
>> 1307 .align 4
>> 1308 .globl C_LABEL(sys_sigsuspend)
>> 1309 C_LABEL(sys_sigsuspend):
>> 1310 call C_LABEL(do_sigsuspend)
>> 1311 add %sp, STACKFRAME_SZ, %o0
>> 1312
>> 1313 ld [%curptr + AOFF_task_ptrace], %l5
>> 1314 andcc %l5, 0x02, %g0
>> 1315 be 1f
>> 1316 nop
>> 1317
>> 1318 call C_LABEL(syscall_trace)
>> 1319 nop
>> 1320
>> 1321 1:
>> 1322 /* We are returning to a signal handler. */
>> 1323 RESTORE_ALL
>> 1324
>> 1325 .align 4
>> 1326 .globl C_LABEL(sys_rt_sigsuspend)
>> 1327 C_LABEL(sys_rt_sigsuspend):
>> 1328 /* Note: %o0, %o1 already have correct value... */
>> 1329 call C_LABEL(do_rt_sigsuspend)
>> 1330 add %sp, STACKFRAME_SZ, %o2
>> 1331
>> 1332 ld [%curptr + AOFF_task_ptrace], %l5
>> 1333 andcc %l5, 0x02, %g0
>> 1334 be 1f
>> 1335 nop
>> 1336
>> 1337 call C_LABEL(syscall_trace)
>> 1338 nop
>> 1339
>> 1340 1:
>> 1341 /* We are returning to a signal handler. */
>> 1342 RESTORE_ALL
>> 1343
>> 1344 .align 4
>> 1345 .globl C_LABEL(sys_sigreturn)
>> 1346 C_LABEL(sys_sigreturn):
>> 1347 call C_LABEL(do_sigreturn)
>> 1348 add %sp, STACKFRAME_SZ, %o0
>> 1349
>> 1350 ld [%curptr + AOFF_task_ptrace], %l5
>> 1351 andcc %l5, 0x02, %g0
>> 1352 be 1f
>> 1353 nop
>> 1354
>> 1355 call C_LABEL(syscall_trace)
>> 1356 nop
>> 1357
>> 1358 1:
>> 1359 /* We don't want to muck with user registers like a
>> 1360 * normal syscall, just return.
>> 1361 */
>> 1362 RESTORE_ALL
>> 1363
>> 1364 .align 4
>> 1365 .globl C_LABEL(sys_rt_sigreturn)
>> 1366 C_LABEL(sys_rt_sigreturn):
>> 1367 call C_LABEL(do_rt_sigreturn)
>> 1368 add %sp, STACKFRAME_SZ, %o0
>> 1369
>> 1370 ld [%curptr + AOFF_task_ptrace], %l5
>> 1371 andcc %l5, 0x02, %g0
>> 1372 be 1f
>> 1373 nop
>> 1374
>> 1375 call C_LABEL(syscall_trace)
>> 1376 nop
>> 1377
>> 1378 1:
>> 1379 /* We are returning to a signal handler. */
>> 1380 RESTORE_ALL
>> 1381
>> 1382 /* Now that we have a real sys_clone, sys_fork() is
>> 1383 * implemented in terms of it. Our _real_ implementation
>> 1384 * of SunOS vfork() will use sys_vfork().
>> 1385 *
>> 1386 * XXX These three should be consolidated into mostly shared
>> 1387 * XXX code just like on sparc64... -DaveM
>> 1388 */
>> 1389 .align 4
>> 1390 .globl C_LABEL(sys_fork), flush_patch_two
>> 1391 C_LABEL(sys_fork):
>> 1392 mov %o7, %l5
>> 1393 flush_patch_two:
>> 1394 FLUSH_ALL_KERNEL_WINDOWS;
>> 1395 rd %psr, %g4
>> 1396 WRITE_PAUSE
>> 1397 mov SIGCHLD, %o0 ! arg0: clone flags
>> 1398 rd %wim, %g5
>> 1399 WRITE_PAUSE
>> 1400 mov %fp, %o1 ! arg1: usp
>> 1401 std %g4, [%curptr + AOFF_task_thread + AOFF_thread_fork_kpsr]
>> 1402 add %sp, STACKFRAME_SZ, %o2 ! arg2: pt_regs ptr
>> 1403 mov 0, %o3
>> 1404 call C_LABEL(do_fork)
>> 1405 mov %l5, %o7
>> 1406
>> 1407 /* Whee, kernel threads! */
>> 1408 .globl C_LABEL(sys_clone), flush_patch_three
>> 1409 C_LABEL(sys_clone):
>> 1410 mov %o7, %l5
>> 1411 flush_patch_three:
>> 1412 FLUSH_ALL_KERNEL_WINDOWS;
>> 1413 rd %psr, %g4
>> 1414 WRITE_PAUSE
>> 1415
>> 1416 /* arg0,1: flags,usp -- loaded already */
>> 1417 cmp %o1, 0x0 ! Is new_usp NULL?
>> 1418 rd %wim, %g5
>> 1419 WRITE_PAUSE
>> 1420 be,a 1f
>> 1421 mov %fp, %o1 ! yes, use callers usp
>> 1422 andn %o1, 7, %o1 ! no, align to 8 bytes
>> 1423 1:
>> 1424 std %g4, [%curptr + AOFF_task_thread + AOFF_thread_fork_kpsr]
>> 1425 add %sp, STACKFRAME_SZ, %o2 ! arg2: pt_regs ptr
>> 1426 mov 0, %o3
>> 1427 call C_LABEL(do_fork)
>> 1428 mov %l5, %o7
>> 1429
>> 1430 /* Whee, real vfork! */
>> 1431 .globl C_LABEL(sys_vfork), flush_patch_four
>> 1432 C_LABEL(sys_vfork):
>> 1433 flush_patch_four:
>> 1434 FLUSH_ALL_KERNEL_WINDOWS;
>> 1435 rd %psr, %g4
>> 1436 WRITE_PAUSE
>> 1437 rd %wim, %g5
>> 1438 WRITE_PAUSE
>> 1439 std %g4, [%curptr + AOFF_task_thread + AOFF_thread_fork_kpsr]
>> 1440 sethi %hi(0x4000 | 0x0100 | SIGCHLD), %o0
>> 1441 mov %fp, %o1
>> 1442 or %o0, %lo(0x4000 | 0x0100 | SIGCHLD), %o0
>> 1443 sethi %hi(C_LABEL(do_fork)), %l1
>> 1444 mov 0, %o3
>> 1445 jmpl %l1 + %lo(C_LABEL(do_fork)), %g0
>> 1446 add %sp, STACKFRAME_SZ, %o2
>> 1447
>> 1448 .align 4
>> 1449 linux_sparc_ni_syscall:
>> 1450 sethi %hi(C_LABEL(sys_ni_syscall)), %l7
>> 1451 b syscall_is_too_hard
>> 1452 or %l7, %lo(C_LABEL(sys_ni_syscall)), %l7
>> 1453
>> 1454 linux_fast_syscall:
>> 1455 andn %l7, 3, %l7
>> 1456 mov %i0, %o0
>> 1457 mov %i1, %o1
>> 1458 mov %i2, %o2
>> 1459 jmpl %l7 + %g0, %g0
>> 1460 mov %i3, %o3
>> 1461
>> 1462 linux_syscall_trace:
>> 1463 call C_LABEL(syscall_trace)
>> 1464 nop
>> 1465 mov %i0, %o0
>> 1466 mov %i1, %o1
>> 1467 mov %i2, %o2
>> 1468 mov %i3, %o3
110 b 2f 1469 b 2f
111 1: jal trace_hardirqs_off !! 1470 mov %i4, %o4
>> 1471
>> 1472 .globl C_LABEL(ret_from_fork)
>> 1473 C_LABEL(ret_from_fork):
>> 1474 call schedule_tail
>> 1475 mov %g3, %o0
>> 1476 b C_LABEL(ret_sys_call)
>> 1477 ld [%sp + STACKFRAME_SZ + PT_I0], %o0
>> 1478
>> 1479 /* Linux native and SunOS system calls enter here... */
>> 1480 .align 4
>> 1481 .globl linux_sparc_syscall
>> 1482 linux_sparc_syscall:
>> 1483 /* Direct access to user regs, must faster. */
>> 1484 cmp %g1, NR_SYSCALLS
>> 1485 bgeu linux_sparc_ni_syscall
>> 1486 sll %g1, 2, %l4
>> 1487 ld [%l7 + %l4], %l7
>> 1488 andcc %l7, 1, %g0
>> 1489 bne linux_fast_syscall
>> 1490 /* Just do first insn from SAVE_ALL in the delay slot */
>> 1491
>> 1492 .globl syscall_is_too_hard
>> 1493 syscall_is_too_hard:
>> 1494 SAVE_ALL_HEAD
>> 1495 rd %wim, %l3
>> 1496
>> 1497 wr %l0, PSR_ET, %psr
>> 1498 mov %i0, %o0
>> 1499 mov %i1, %o1
>> 1500 mov %i2, %o2
>> 1501
>> 1502 ld [%curptr + AOFF_task_ptrace], %l5
>> 1503 mov %i3, %o3
>> 1504 andcc %l5, 0x02, %g0
>> 1505 mov %i4, %o4
>> 1506 bne linux_syscall_trace
>> 1507 mov %i0, %l5
112 2: 1508 2:
113 RESTORE_TEMP !! 1509 call %l7
114 RESTORE_AT !! 1510 mov %i5, %o5
115 RESTORE_STATIC <<
116 #endif <<
117 RESTORE_SOME <<
118 RESTORE_SP_AND_RET <<
119 .set at <<
120 <<
121 work_pending: <<
122 andi t0, a2, _TIF_NEED_RESCHED # a2 <<
123 beqz t0, work_notifysig <<
124 work_resched: <<
125 TRACE_IRQS_OFF <<
126 jal schedule <<
127 <<
128 local_irq_disable # make <<
129 # sign <<
130 # samp <<
131 LONG_L a2, TI_FLAGS($28) <<
132 andi t0, a2, _TIF_WORK_MASK # is t <<
133 # othe <<
134 beqz t0, restore_all <<
135 andi t0, a2, _TIF_NEED_RESCHED <<
136 bnez t0, work_resched <<
137 <<
138 work_notifysig: # deal <<
139 # noti <<
140 move a0, sp <<
141 li a1, 0 <<
142 jal do_notify_resume # a2 a <<
143 j resume_userspace_check <<
144 <<
145 FEXPORT(syscall_exit_partial) <<
146 #ifdef CONFIG_DEBUG_RSEQ <<
147 move a0, sp <<
148 jal rseq_syscall <<
149 #endif <<
150 local_irq_disable # make <<
151 # chan <<
152 LONG_L a2, TI_FLAGS($28) # curr <<
153 li t0, _TIF_ALLWORK_MASK <<
154 and t0, a2 <<
155 beqz t0, restore_partial <<
156 SAVE_STATIC <<
157 syscall_exit_work: <<
158 LONG_L t0, PT_STATUS(sp) <<
159 andi t0, t0, KU_USER <<
160 beqz t0, resume_kernel <<
161 li t0, _TIF_WORK_SYSCALL_EXIT <<
162 and t0, a2 # a2 i <<
163 beqz t0, work_pending # trac <<
164 local_irq_enable # coul <<
165 # call <<
166 TRACE_IRQS_ON <<
167 move a0, sp <<
168 jal syscall_trace_leave <<
169 b resume_userspace <<
170 1511
171 #if defined(CONFIG_CPU_MIPSR2) || defined(CONF !! 1512 st %o0, [%sp + STACKFRAME_SZ + PT_I0]
172 defined(CONFIG_CPU_MIPSR6) || defined(CONF <<
173 1513
174 /* !! 1514 .globl C_LABEL(ret_sys_call)
175 * MIPS32R2 Instruction Hazard Barrier - must !! 1515 C_LABEL(ret_sys_call):
>> 1516 ld [%curptr + AOFF_task_ptrace], %l6
>> 1517 cmp %o0, -ENOIOCTLCMD
>> 1518 ld [%sp + STACKFRAME_SZ + PT_PSR], %g3
>> 1519 set PSR_C, %g2
>> 1520 bgeu 1f
>> 1521 andcc %l6, 0x02, %l6
>> 1522
>> 1523 /* System call success, clear Carry condition code. */
>> 1524 andn %g3, %g2, %g3
>> 1525 clr %l6
>> 1526 st %g3, [%sp + STACKFRAME_SZ + PT_PSR]
>> 1527 bne linux_syscall_trace2
>> 1528 ld [%sp + STACKFRAME_SZ + PT_NPC], %l1 /* pc = npc */
>> 1529 add %l1, 0x4, %l2 /* npc = npc+4 */
>> 1530 st %l1, [%sp + STACKFRAME_SZ + PT_PC]
>> 1531 b ret_trap_entry
>> 1532 st %l2, [%sp + STACKFRAME_SZ + PT_NPC]
>> 1533 1:
>> 1534 /* System call failure, set Carry condition code.
>> 1535 * Also, get abs(errno) to return to the process.
>> 1536 */
>> 1537 sub %g0, %o0, %o0
>> 1538 or %g3, %g2, %g3
>> 1539 st %o0, [%sp + STACKFRAME_SZ + PT_I0]
>> 1540 mov 1, %l6
>> 1541 st %g3, [%sp + STACKFRAME_SZ + PT_PSR]
>> 1542 bne linux_syscall_trace2
>> 1543 ld [%sp + STACKFRAME_SZ + PT_NPC], %l1 /* pc = npc */
>> 1544 add %l1, 0x4, %l2 /* npc = npc+4 */
>> 1545 st %l1, [%sp + STACKFRAME_SZ + PT_PC]
>> 1546 b ret_trap_entry
>> 1547 st %l2, [%sp + STACKFRAME_SZ + PT_NPC]
>> 1548
>> 1549 linux_syscall_trace2:
>> 1550 call C_LABEL(syscall_trace)
>> 1551 add %l1, 0x4, %l2 /* npc = npc+4 */
>> 1552 st %l1, [%sp + STACKFRAME_SZ + PT_PC]
>> 1553 b ret_trap_entry
>> 1554 st %l2, [%sp + STACKFRAME_SZ + PT_NPC]
>> 1555
>> 1556
>> 1557 /*
>> 1558 * Solaris system calls and indirect system calls enter here.
>> 1559 *
>> 1560 * I have named the solaris indirect syscalls like that because
>> 1561 * it seems like Solaris has some fast path syscalls that can
>> 1562 * be handled as indirect system calls. - mig
>> 1563 */
>> 1564
>> 1565 linux_syscall_for_solaris:
>> 1566 sethi %hi(sys_call_table), %l7
>> 1567 b linux_sparc_syscall
>> 1568 or %l7, %lo(sys_call_table), %l7
>> 1569
>> 1570 .align 4
>> 1571 .globl solaris_syscall
>> 1572 solaris_syscall:
>> 1573 cmp %g1,59
>> 1574 be linux_syscall_for_solaris
>> 1575 cmp %g1,2
>> 1576 be linux_syscall_for_solaris
>> 1577 cmp %g1,42
>> 1578 be linux_syscall_for_solaris
>> 1579 cmp %g1,119
>> 1580 be,a linux_syscall_for_solaris
>> 1581 mov 2, %g1
>> 1582 1:
>> 1583 SAVE_ALL_HEAD
>> 1584 rd %wim, %l3
>> 1585
>> 1586 wr %l0, PSR_ET, %psr
>> 1587 nop
>> 1588 nop
>> 1589 mov %i0, %l5
>> 1590
>> 1591 call C_LABEL(do_solaris_syscall)
>> 1592 add %sp, STACKFRAME_SZ, %o0
>> 1593
>> 1594 st %o0, [%sp + STACKFRAME_SZ + PT_I0]
>> 1595 set PSR_C, %g2
>> 1596 cmp %o0, -ENOIOCTLCMD
>> 1597 bgeu 1f
>> 1598 ld [%sp + STACKFRAME_SZ + PT_PSR], %g3
>> 1599
>> 1600 /* System call success, clear Carry condition code. */
>> 1601 andn %g3, %g2, %g3
>> 1602 clr %l6
>> 1603 b 2f
>> 1604 st %g3, [%sp + STACKFRAME_SZ + PT_PSR]
>> 1605
>> 1606 1:
>> 1607 /* System call failure, set Carry condition code.
>> 1608 * Also, get abs(errno) to return to the process.
>> 1609 */
>> 1610 sub %g0, %o0, %o0
>> 1611 mov 1, %l6
>> 1612 st %o0, [%sp + STACKFRAME_SZ + PT_I0]
>> 1613 or %g3, %g2, %g3
>> 1614 st %g3, [%sp + STACKFRAME_SZ + PT_PSR]
>> 1615
>> 1616 /* Advance the pc and npc over the trap instruction.
>> 1617 * If the npc is unaligned (has a 1 in the lower byte), it means
>> 1618 * the kernel does not want us to play magic (ie, skipping over
>> 1619 * traps). Mainly when the Solaris code wants to set some PC and
>> 1620 * nPC (setcontext).
>> 1621 */
>> 1622 2:
>> 1623 ld [%sp + STACKFRAME_SZ + PT_NPC], %l1 /* pc = npc */
>> 1624 andcc %l1, 1, %g0
>> 1625 bne 1f
>> 1626 add %l1, 0x4, %l2 /* npc = npc+4 */
>> 1627 st %l1, [%sp + STACKFRAME_SZ + PT_PC]
>> 1628 b ret_trap_entry
>> 1629 st %l2, [%sp + STACKFRAME_SZ + PT_NPC]
>> 1630
>> 1631 /* kernel knows what it is doing, fixup npc and continue */
>> 1632 1:
>> 1633 sub %l1, 1, %l1
>> 1634 b ret_trap_entry
>> 1635 st %l1, [%sp + STACKFRAME_SZ + PT_NPC]
>> 1636
>> 1637 #ifndef CONFIG_SUNOS_EMUL
>> 1638 .align 4
>> 1639 .globl sunos_syscall
>> 1640 sunos_syscall:
>> 1641 SAVE_ALL_HEAD
>> 1642 rd %wim, %l3
>> 1643 wr %l0, PSR_ET, %psr
>> 1644 nop
>> 1645 nop
>> 1646 mov %i0, %l5
>> 1647 call C_LABEL(do_sunos_syscall)
>> 1648 add %sp, STACKFRAME_SZ, %o0
>> 1649 #endif
>> 1650
>> 1651 /* {net, open}bsd system calls enter here... */
>> 1652 .align 4
>> 1653 .globl bsd_syscall
>> 1654 bsd_syscall:
>> 1655 /* Direct access to user regs, must faster. */
>> 1656 cmp %g1, NR_SYSCALLS
>> 1657 blu,a 1f
>> 1658 sll %g1, 2, %l4
>> 1659
>> 1660 set C_LABEL(sys_ni_syscall), %l7
>> 1661 b bsd_is_too_hard
>> 1662 nop
>> 1663
>> 1664 1:
>> 1665 ld [%l7 + %l4], %l7
>> 1666
>> 1667 .globl bsd_is_too_hard
>> 1668 bsd_is_too_hard:
>> 1669 rd %wim, %l3
>> 1670 SAVE_ALL
>> 1671
>> 1672 wr %l0, PSR_ET, %psr
>> 1673 WRITE_PAUSE
>> 1674
>> 1675 2:
>> 1676 mov %i0, %o0
>> 1677 mov %i1, %o1
>> 1678 mov %i2, %o2
>> 1679 mov %i0, %l5
>> 1680 mov %i3, %o3
>> 1681 mov %i4, %o4
>> 1682 call %l7
>> 1683 mov %i5, %o5
>> 1684
>> 1685 st %o0, [%sp + STACKFRAME_SZ + PT_I0]
>> 1686 set PSR_C, %g2
>> 1687 cmp %o0, -ENOIOCTLCMD
>> 1688 bgeu 1f
>> 1689 ld [%sp + STACKFRAME_SZ + PT_PSR], %g3
>> 1690
>> 1691 /* System call success, clear Carry condition code. */
>> 1692 andn %g3, %g2, %g3
>> 1693 clr %l6
>> 1694 b 2f
>> 1695 st %g3, [%sp + STACKFRAME_SZ + PT_PSR]
>> 1696
>> 1697 1:
>> 1698 /* System call failure, set Carry condition code.
>> 1699 * Also, get abs(errno) to return to the process.
>> 1700 */
>> 1701 sub %g0, %o0, %o0
>> 1702 #if 0 /* XXX todo XXX */
>> 1703 sethi %hi(C_LABEL(bsd_xlatb_rorl), %o3
>> 1704 or %o3, %lo(C_LABEL(bsd_xlatb_rorl)), %o3
>> 1705 sll %o0, 2, %o0
>> 1706 ld [%o3 + %o0], %o0
>> 1707 #endif
>> 1708 mov 1, %l6
>> 1709 st %o0, [%sp + STACKFRAME_SZ + PT_I0]
>> 1710 or %g3, %g2, %g3
>> 1711 st %g3, [%sp + STACKFRAME_SZ + PT_PSR]
>> 1712
>> 1713 /* Advance the pc and npc over the trap instruction. */
>> 1714 2:
>> 1715 ld [%sp + STACKFRAME_SZ + PT_NPC], %l1 /* pc = npc */
>> 1716 add %l1, 0x4, %l2 /* npc = npc+4 */
>> 1717 st %l1, [%sp + STACKFRAME_SZ + PT_PC]
>> 1718 b ret_trap_entry
>> 1719 st %l2, [%sp + STACKFRAME_SZ + PT_NPC]
>> 1720
>> 1721 /* Saving and restoring the FPU state is best done from lowlevel code.
176 * 1722 *
177 * For C code use the inline version named ins !! 1723 * void fpsave(unsigned long *fpregs, unsigned long *fsr,
>> 1724 * void *fpqueue, unsigned long *fpqdepth)
178 */ 1725 */
179 LEAF(mips_ihb) <<
180 .set MIPS_ISA_LEVEL_RAW <<
181 jr.hb ra <<
182 nop <<
183 END(mips_ihb) <<
184 1726
185 #endif /* CONFIG_CPU_MIPSR2 - CONFIG_CPU_MIPSR !! 1727 .globl C_LABEL(fpsave)
>> 1728 C_LABEL(fpsave):
>> 1729 st %fsr, [%o1] ! this can trap on us if fpu is in bogon state
>> 1730 ld [%o1], %g1
>> 1731 set 0x2000, %g4
>> 1732 andcc %g1, %g4, %g0
>> 1733 be 2f
>> 1734 mov 0, %g2
>> 1735
>> 1736 /* We have an fpqueue to save. */
>> 1737 1:
>> 1738 std %fq, [%o2]
>> 1739 fpsave_magic:
>> 1740 st %fsr, [%o1]
>> 1741 ld [%o1], %g3
>> 1742 andcc %g3, %g4, %g0
>> 1743 add %g2, 1, %g2
>> 1744 bne 1b
>> 1745 add %o2, 8, %o2
>> 1746
>> 1747 2:
>> 1748 st %g2, [%o3]
>> 1749
>> 1750 std %f0, [%o0 + 0x00]
>> 1751 std %f2, [%o0 + 0x08]
>> 1752 std %f4, [%o0 + 0x10]
>> 1753 std %f6, [%o0 + 0x18]
>> 1754 std %f8, [%o0 + 0x20]
>> 1755 std %f10, [%o0 + 0x28]
>> 1756 std %f12, [%o0 + 0x30]
>> 1757 std %f14, [%o0 + 0x38]
>> 1758 std %f16, [%o0 + 0x40]
>> 1759 std %f18, [%o0 + 0x48]
>> 1760 std %f20, [%o0 + 0x50]
>> 1761 std %f22, [%o0 + 0x58]
>> 1762 std %f24, [%o0 + 0x60]
>> 1763 std %f26, [%o0 + 0x68]
>> 1764 std %f28, [%o0 + 0x70]
>> 1765 retl
>> 1766 std %f30, [%o0 + 0x78]
>> 1767
>> 1768 /* Thanks for Theo Deraadt and the authors of the Sprite/netbsd/openbsd
>> 1769 * code for pointing out this possible deadlock, while we save state
>> 1770 * above we could trap on the fsr store so our low level fpu trap
>> 1771 * code has to know how to deal with this.
>> 1772 */
>> 1773 fpsave_catch:
>> 1774 b fpsave_magic + 4
>> 1775 st %fsr, [%o1]
>> 1776
>> 1777 fpsave_catch2:
>> 1778 b C_LABEL(fpsave) + 4
>> 1779 st %fsr, [%o1]
>> 1780
>> 1781 /* void fpload(unsigned long *fpregs, unsigned long *fsr); */
>> 1782
>> 1783 .globl C_LABEL(fpload)
>> 1784 C_LABEL(fpload):
>> 1785 ldd [%o0 + 0x00], %f0
>> 1786 ldd [%o0 + 0x08], %f2
>> 1787 ldd [%o0 + 0x10], %f4
>> 1788 ldd [%o0 + 0x18], %f6
>> 1789 ldd [%o0 + 0x20], %f8
>> 1790 ldd [%o0 + 0x28], %f10
>> 1791 ldd [%o0 + 0x30], %f12
>> 1792 ldd [%o0 + 0x38], %f14
>> 1793 ldd [%o0 + 0x40], %f16
>> 1794 ldd [%o0 + 0x48], %f18
>> 1795 ldd [%o0 + 0x50], %f20
>> 1796 ldd [%o0 + 0x58], %f22
>> 1797 ldd [%o0 + 0x60], %f24
>> 1798 ldd [%o0 + 0x68], %f26
>> 1799 ldd [%o0 + 0x70], %f28
>> 1800 ldd [%o0 + 0x78], %f30
>> 1801 ld [%o1], %fsr
>> 1802 retl
>> 1803 nop
>> 1804
>> 1805 .globl C_LABEL(ndelay)
>> 1806 C_LABEL(ndelay):
>> 1807 save %sp, -STACKFRAME_SZ, %sp
>> 1808 mov %i0, %o0
>> 1809 call .umul
>> 1810 mov 5, %o1
>> 1811 ba delay_continue
>> 1812 nop
>> 1813
>> 1814 .globl C_LABEL(udelay)
>> 1815 C_LABEL(udelay):
>> 1816 save %sp, -STACKFRAME_SZ, %sp
>> 1817 mov %i0, %o0
>> 1818 sethi %hi(0x10c6), %o1
>> 1819 call .umul
>> 1820 or %o1, %lo(0x10c6), %o1
>> 1821 delay_continue:
>> 1822 #ifndef CONFIG_SMP
>> 1823 sethi %hi(C_LABEL(loops_per_jiffy)), %o3
>> 1824 call .umul
>> 1825 ld [%o3 + %lo(C_LABEL(loops_per_jiffy))], %o1
>> 1826 #else
>> 1827 GET_PROCESSOR_OFFSET(o4, o2)
>> 1828 set C_LABEL(cpu_data), %o3
>> 1829 call .umul
>> 1830 ld [%o3 + %o4], %o1
>> 1831 #endif
>> 1832 call .umul
>> 1833 mov 100, %o0
>> 1834
>> 1835 cmp %o0, 0x0
>> 1836 1:
>> 1837 bne 1b
>> 1838 subcc %o0, 1, %o0
>> 1839
>> 1840 ret
>> 1841 restore
>> 1842
>> 1843 /* Handle a software breakpoint */
>> 1844 /* We have to inform parent that child has stopped */
>> 1845 .align 4
>> 1846 .globl breakpoint_trap
>> 1847 breakpoint_trap:
>> 1848 rd %wim,%l3
>> 1849 SAVE_ALL
>> 1850 wr %l0, PSR_ET, %psr
>> 1851 WRITE_PAUSE
>> 1852
>> 1853 st %i0, [%sp + STACKFRAME_SZ + PT_G0] ! for restarting syscalls
>> 1854 call C_LABEL(sparc_breakpoint)
>> 1855 add %sp, STACKFRAME_SZ, %o0
>> 1856
>> 1857 RESTORE_ALL
>> 1858
>> 1859 .align 4
>> 1860 .globl C_LABEL(__handle_exception), flush_patch_exception
>> 1861 C_LABEL(__handle_exception):
>> 1862 flush_patch_exception:
>> 1863 FLUSH_ALL_KERNEL_WINDOWS;
>> 1864 ldd [%o0], %o6
>> 1865 jmpl %o7 + 0xc, %g0 ! see asm-sparc/processor.h
>> 1866 mov 1, %g1 ! signal EFAULT condition
>> 1867
>> 1868 .align 4
>> 1869 .globl C_LABEL(kill_user_windows), kuw_patch1_7win
>> 1870 .globl kuw_patch1
>> 1871 kuw_patch1_7win: sll %o3, 6, %o3
>> 1872
>> 1873 /* No matter how much overhead this routine has in the worst
>> 1874 * case scenerio, it is several times better than taking the
>> 1875 * traps with the old method of just doing flush_user_windows().
>> 1876 */
>> 1877 C_LABEL(kill_user_windows):
>> 1878 ld [%g6 + AOFF_task_thread + AOFF_thread_uwinmask], %o0 ! get current umask
>> 1879 orcc %g0, %o0, %g0 ! if no bits set, we are done
>> 1880 be 3f ! nothing to do
>> 1881 rd %psr, %o5 ! must clear interrupts
>> 1882 or %o5, PSR_PIL, %o4 ! or else that could change
>> 1883 wr %o4, 0x0, %psr ! the uwinmask state
>> 1884 WRITE_PAUSE ! burn them cycles
>> 1885 1:
>> 1886 ld [%g6 + AOFF_task_thread + AOFF_thread_uwinmask], %o0 ! get consistant state
>> 1887 orcc %g0, %o0, %g0 ! did an interrupt come in?
>> 1888 be 4f ! yep, we are done
>> 1889 rd %wim, %o3 ! get current wim
>> 1890 srl %o3, 1, %o4 ! simulate a save
>> 1891 kuw_patch1:
>> 1892 sll %o3, 7, %o3 ! compute next wim
>> 1893 or %o4, %o3, %o3 ! result
>> 1894 andncc %o0, %o3, %o0 ! clean this bit in umask
>> 1895 bne kuw_patch1 ! not done yet
>> 1896 srl %o3, 1, %o4 ! begin another save simulation
>> 1897 wr %o3, 0x0, %wim ! set the new wim
>> 1898 st %g0, [%g6 + AOFF_task_thread + AOFF_thread_uwinmask] ! clear uwinmask
>> 1899 4:
>> 1900 wr %o5, 0x0, %psr ! re-enable interrupts
>> 1901 WRITE_PAUSE ! burn baby burn
>> 1902 3:
>> 1903 retl ! return
>> 1904 st %g0, [%g6 + AOFF_task_thread + AOFF_thread_w_saved] ! no windows saved
>> 1905
>> 1906 .align 4
>> 1907 .globl C_LABEL(restore_current)
>> 1908 C_LABEL(restore_current):
>> 1909 LOAD_CURRENT(g6, o0)
>> 1910 retl
>> 1911 nop
>> 1912
>> 1913 #ifdef CONFIG_PCI
>> 1914 #include <asm/pcic.h>
>> 1915
>> 1916 .align 4
>> 1917 .globl linux_trap_ipi15_pcic
>> 1918 linux_trap_ipi15_pcic:
>> 1919 rd %wim, %l3
>> 1920 SAVE_ALL
>> 1921
>> 1922 /*
>> 1923 * First deactivate NMI
>> 1924 * or we cannot drop ET, cannot get window spill traps.
>> 1925 * The busy loop is necessary because the PIO error
>> 1926 * sometimes does not go away quickly and we trap again.
>> 1927 */
>> 1928 sethi %hi(C_LABEL(pcic_regs)), %o1
>> 1929 ld [%o1 + %lo(C_LABEL(pcic_regs))], %o2
>> 1930
>> 1931 ! Get pending status for printouts later.
>> 1932 ld [%o2 + PCI_SYS_INT_PENDING], %o0
>> 1933
>> 1934 mov PCI_SYS_INT_PENDING_CLEAR_ALL, %o1
>> 1935 stb %o1, [%o2 + PCI_SYS_INT_PENDING_CLEAR]
>> 1936 1:
>> 1937 ld [%o2 + PCI_SYS_INT_PENDING], %o1
>> 1938 andcc %o1, ((PCI_SYS_INT_PENDING_PIO|PCI_SYS_INT_PENDING_PCI)>>24), %g0
>> 1939 bne 1b
>> 1940 nop
>> 1941
>> 1942 or %l0, PSR_PIL, %l4
>> 1943 wr %l4, 0x0, %psr
>> 1944 WRITE_PAUSE
>> 1945 wr %l4, PSR_ET, %psr
>> 1946 WRITE_PAUSE
>> 1947
>> 1948 call C_LABEL(pcic_nmi)
>> 1949 add %sp, STACKFRAME_SZ, %o1 ! struct pt_regs *regs
>> 1950 RESTORE_ALL
>> 1951
>> 1952 .globl C_LABEL(pcic_nmi_trap_patch)
>> 1953 C_LABEL(pcic_nmi_trap_patch):
>> 1954 sethi %hi(linux_trap_ipi15_pcic), %l3
>> 1955 jmpl %l3 + %lo(linux_trap_ipi15_pcic), %g0
>> 1956 rd %psr, %l0
>> 1957 .word 0
>> 1958
>> 1959 #endif /* CONFIG_PCI */
>> 1960
>> 1961 /* End of entry.S */
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