1 /* SPDX-License-Identifier: GPL-2.0-only */ !! 1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* !! 2 /* arch/sparc/kernel/entry.S: Sparc trap low-level entry points.
3 * Common Low Level Interrupts/Traps/Exception <<
4 * (included from entry-<isa>.S <<
5 * 3 *
6 * Copyright (C) 2014-15 Synopsys, Inc. (www.s !! 4 * Copyright (C) 1995, 2007 David S. Miller (davem@davemloft.net)
7 * Copyright (C) 2004, 2007-2010, 2011-2012 Sy !! 5 * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
>> 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)
8 */ 9 */
9 10
10 /*-------------------------------------------- !! 11 #include <linux/export.h>
11 * Function ABI !! 12 #include <linux/linkage.h>
12 *-------------------------------------------- !! 13 #include <linux/errno.h>
13 * !! 14 #include <linux/pgtable.h>
14 * Arguments r0 - r !! 15
15 * Caller Saved Registers r0 - r !! 16 #include <asm/head.h>
16 * Callee Saved Registers r13- r !! 17 #include <asm/asi.h>
17 * Global Pointer (gp) r26 !! 18 #include <asm/smp.h>
18 * Frame Pointer (fp) r27 !! 19 #include <asm/contregs.h>
19 * Stack Pointer (sp) r28 !! 20 #include <asm/ptrace.h>
20 * Branch link register (blink) r31 !! 21 #include <asm/asm-offsets.h>
21 *-------------------------------------------- !! 22 #include <asm/psr.h>
22 */ !! 23 #include <asm/vaddrs.h>
>> 24 #include <asm/page.h>
>> 25 #include <asm/winmacro.h>
>> 26 #include <asm/signal.h>
>> 27 #include <asm/obio.h>
>> 28 #include <asm/mxcc.h>
>> 29 #include <asm/thread_info.h>
>> 30 #include <asm/param.h>
>> 31 #include <asm/unistd.h>
>> 32
>> 33 #include <asm/asmmacro.h>
>> 34
>> 35 #define curptr g6
>> 36
>> 37 /* These are just handy. */
>> 38 #define _SV save %sp, -STACKFRAME_SZ, %sp
>> 39 #define _RS restore
>> 40
>> 41 #define FLUSH_ALL_KERNEL_WINDOWS \
>> 42 _SV; _SV; _SV; _SV; _SV; _SV; _SV; \
>> 43 _RS; _RS; _RS; _RS; _RS; _RS; _RS;
>> 44
>> 45 .text
>> 46
>> 47 #ifdef CONFIG_KGDB
>> 48 .align 4
>> 49 .globl arch_kgdb_breakpoint
>> 50 .type arch_kgdb_breakpoint,#function
>> 51 arch_kgdb_breakpoint:
>> 52 ta 0x7d
>> 53 retl
>> 54 nop
>> 55 .size arch_kgdb_breakpoint,.-arch_kgdb_breakpoint
>> 56 #endif
23 57
24 ;################### Special Sys Call Wrappers !! 58 #if defined(CONFIG_BLK_DEV_FD) || defined(CONFIG_BLK_DEV_FD_MODULE)
>> 59 .align 4
>> 60 .globl floppy_hardint
>> 61 floppy_hardint:
>> 62 /*
>> 63 * This code cannot touch registers %l0 %l1 and %l2
>> 64 * because SAVE_ALL depends on their values. It depends
>> 65 * on %l3 also, but we regenerate it before a call.
>> 66 * Other registers are:
>> 67 * %l3 -- base address of fdc registers
>> 68 * %l4 -- pdma_vaddr
>> 69 * %l5 -- scratch for ld/st address
>> 70 * %l6 -- pdma_size
>> 71 * %l7 -- scratch [floppy byte, ld/st address, aux. data]
>> 72 */
>> 73
>> 74 /* Do we have work to do? */
>> 75 sethi %hi(doing_pdma), %l7
>> 76 ld [%l7 + %lo(doing_pdma)], %l7
>> 77 cmp %l7, 0
>> 78 be floppy_dosoftint
>> 79 nop
>> 80
>> 81 /* Load fdc register base */
>> 82 sethi %hi(fdc_status), %l3
>> 83 ld [%l3 + %lo(fdc_status)], %l3
>> 84
>> 85 /* Setup register addresses */
>> 86 sethi %hi(pdma_vaddr), %l5 ! transfer buffer
>> 87 ld [%l5 + %lo(pdma_vaddr)], %l4
>> 88 sethi %hi(pdma_size), %l5 ! bytes to go
>> 89 ld [%l5 + %lo(pdma_size)], %l6
>> 90 next_byte:
>> 91 ldub [%l3], %l7
>> 92
>> 93 andcc %l7, 0x80, %g0 ! Does fifo still have data
>> 94 bz floppy_fifo_emptied ! fifo has been emptied...
>> 95 andcc %l7, 0x20, %g0 ! in non-dma mode still?
>> 96 bz floppy_overrun ! nope, overrun
>> 97 andcc %l7, 0x40, %g0 ! 0=write 1=read
>> 98 bz floppy_write
>> 99 sub %l6, 0x1, %l6
>> 100
>> 101 /* Ok, actually read this byte */
>> 102 ldub [%l3 + 1], %l7
>> 103 orcc %g0, %l6, %g0
>> 104 stb %l7, [%l4]
>> 105 bne next_byte
>> 106 add %l4, 0x1, %l4
>> 107
>> 108 b floppy_tdone
>> 109 nop
>> 110
>> 111 floppy_write:
>> 112 /* Ok, actually write this byte */
>> 113 ldub [%l4], %l7
>> 114 orcc %g0, %l6, %g0
>> 115 stb %l7, [%l3 + 1]
>> 116 bne next_byte
>> 117 add %l4, 0x1, %l4
>> 118
>> 119 /* fall through... */
>> 120 floppy_tdone:
>> 121 sethi %hi(pdma_vaddr), %l5
>> 122 st %l4, [%l5 + %lo(pdma_vaddr)]
>> 123 sethi %hi(pdma_size), %l5
>> 124 st %l6, [%l5 + %lo(pdma_size)]
>> 125 /* Flip terminal count pin */
>> 126 set auxio_register, %l7
>> 127 ld [%l7], %l7
>> 128
>> 129 ldub [%l7], %l5
>> 130
>> 131 or %l5, 0xc2, %l5
>> 132 stb %l5, [%l7]
>> 133 andn %l5, 0x02, %l5
>> 134
>> 135 2:
>> 136 /* Kill some time so the bits set */
>> 137 WRITE_PAUSE
>> 138 WRITE_PAUSE
>> 139
>> 140 stb %l5, [%l7]
>> 141
>> 142 /* Prevent recursion */
>> 143 sethi %hi(doing_pdma), %l7
>> 144 b floppy_dosoftint
>> 145 st %g0, [%l7 + %lo(doing_pdma)]
>> 146
>> 147 /* We emptied the FIFO, but we haven't read everything
>> 148 * as of yet. Store the current transfer address and
>> 149 * bytes left to read so we can continue when the next
>> 150 * fast IRQ comes in.
>> 151 */
>> 152 floppy_fifo_emptied:
>> 153 sethi %hi(pdma_vaddr), %l5
>> 154 st %l4, [%l5 + %lo(pdma_vaddr)]
>> 155 sethi %hi(pdma_size), %l7
>> 156 st %l6, [%l7 + %lo(pdma_size)]
>> 157
>> 158 /* Restore condition codes */
>> 159 wr %l0, 0x0, %psr
>> 160 WRITE_PAUSE
>> 161
>> 162 jmp %l1
>> 163 rett %l2
>> 164
>> 165 floppy_overrun:
>> 166 sethi %hi(pdma_vaddr), %l5
>> 167 st %l4, [%l5 + %lo(pdma_vaddr)]
>> 168 sethi %hi(pdma_size), %l5
>> 169 st %l6, [%l5 + %lo(pdma_size)]
>> 170 /* Prevent recursion */
>> 171 sethi %hi(doing_pdma), %l7
>> 172 st %g0, [%l7 + %lo(doing_pdma)]
>> 173
>> 174 /* fall through... */
>> 175 floppy_dosoftint:
>> 176 rd %wim, %l3
>> 177 SAVE_ALL
>> 178
>> 179 /* Set all IRQs off. */
>> 180 or %l0, PSR_PIL, %l4
>> 181 wr %l4, 0x0, %psr
>> 182 WRITE_PAUSE
>> 183 wr %l4, PSR_ET, %psr
>> 184 WRITE_PAUSE
>> 185
>> 186 mov 11, %o0 ! floppy irq level (unused anyway)
>> 187 mov %g0, %o1 ! devid is not used in fast interrupts
>> 188 call sparc_floppy_irq
>> 189 add %sp, STACKFRAME_SZ, %o2 ! struct pt_regs *regs
>> 190
>> 191 RESTORE_ALL
>> 192
>> 193 #endif /* (CONFIG_BLK_DEV_FD) */
>> 194
>> 195 /* Bad trap handler */
>> 196 .globl bad_trap_handler
>> 197 bad_trap_handler:
>> 198 SAVE_ALL
>> 199
>> 200 wr %l0, PSR_ET, %psr
>> 201 WRITE_PAUSE
>> 202
>> 203 add %sp, STACKFRAME_SZ, %o0 ! pt_regs
>> 204 call do_hw_interrupt
>> 205 mov %l7, %o1 ! trap number
>> 206
>> 207 RESTORE_ALL
>> 208
>> 209 /* For now all IRQ's not registered get sent here. handler_irq() will
>> 210 * see if a routine is registered to handle this interrupt and if not
>> 211 * it will say so on the console.
>> 212 */
25 213
26 ENTRY(sys_clone_wrapper) !! 214 .align 4
27 SAVE_CALLEE_SAVED_USER !! 215 .globl real_irq_entry, patch_handler_irq
28 bl @sys_clone !! 216 real_irq_entry:
29 DISCARD_CALLEE_SAVED_USER !! 217 SAVE_ALL
30 !! 218
31 GET_CURR_THR_INFO_FLAGS r10 !! 219 #ifdef CONFIG_SMP
32 and.f 0, r10, _TIF_SYSCALL_WORK !! 220 .globl patchme_maybe_smp_msg
33 bnz tracesys_exit !! 221
34 !! 222 cmp %l7, 11
35 b .Lret_from_system_call !! 223 patchme_maybe_smp_msg:
36 END(sys_clone_wrapper) !! 224 bgu maybe_smp4m_msg
37 !! 225 nop
38 ENTRY(sys_clone3_wrapper) !! 226 #endif
39 SAVE_CALLEE_SAVED_USER <<
40 bl @sys_clone3 <<
41 DISCARD_CALLEE_SAVED_USER <<
42 <<
43 GET_CURR_THR_INFO_FLAGS r10 <<
44 and.f 0, r10, _TIF_SYSCALL_WORK <<
45 bnz tracesys_exit <<
46 <<
47 b .Lret_from_system_call <<
48 END(sys_clone3_wrapper) <<
49 <<
50 ENTRY(ret_from_fork) <<
51 ; when the forked child comes here fro <<
52 ; r0 has the last task pointer. <<
53 ; put last task in scheduler queue <<
54 jl @schedule_tail <<
55 227
56 ld r9, [sp, PT_status32] !! 228 real_irq_continue:
57 brne r9, 0, 1f !! 229 or %l0, PSR_PIL, %g2
>> 230 wr %g2, 0x0, %psr
>> 231 WRITE_PAUSE
>> 232 wr %g2, PSR_ET, %psr
>> 233 WRITE_PAUSE
>> 234 mov %l7, %o0 ! irq level
>> 235 patch_handler_irq:
>> 236 call handler_irq
>> 237 add %sp, STACKFRAME_SZ, %o1 ! pt_regs ptr
>> 238 or %l0, PSR_PIL, %g2 ! restore PIL after handler_irq
>> 239 wr %g2, PSR_ET, %psr ! keep ET up
>> 240 WRITE_PAUSE
>> 241
>> 242 RESTORE_ALL
>> 243
>> 244 #ifdef CONFIG_SMP
>> 245 /* SMP per-cpu ticker interrupts are handled specially. */
>> 246 smp4m_ticker:
>> 247 bne real_irq_continue+4
>> 248 or %l0, PSR_PIL, %g2
>> 249 wr %g2, 0x0, %psr
>> 250 WRITE_PAUSE
>> 251 wr %g2, PSR_ET, %psr
>> 252 WRITE_PAUSE
>> 253 call smp4m_percpu_timer_interrupt
>> 254 add %sp, STACKFRAME_SZ, %o0
>> 255 wr %l0, PSR_ET, %psr
>> 256 WRITE_PAUSE
>> 257 RESTORE_ALL
>> 258
>> 259 #define GET_PROCESSOR4M_ID(reg) \
>> 260 rd %tbr, %reg; \
>> 261 srl %reg, 12, %reg; \
>> 262 and %reg, 3, %reg;
>> 263
>> 264 /* Here is where we check for possible SMP IPI passed to us
>> 265 * on some level other than 15 which is the NMI and only used
>> 266 * for cross calls. That has a separate entry point below.
>> 267 *
>> 268 * IPIs are sent on Level 12, 13 and 14. See IRQ_IPI_*.
>> 269 */
>> 270 maybe_smp4m_msg:
>> 271 GET_PROCESSOR4M_ID(o3)
>> 272 sethi %hi(sun4m_irq_percpu), %l5
>> 273 sll %o3, 2, %o3
>> 274 or %l5, %lo(sun4m_irq_percpu), %o5
>> 275 sethi %hi(0x70000000), %o2 ! Check all soft-IRQs
>> 276 ld [%o5 + %o3], %o1
>> 277 ld [%o1 + 0x00], %o3 ! sun4m_irq_percpu[cpu]->pending
>> 278 andcc %o3, %o2, %g0
>> 279 be,a smp4m_ticker
>> 280 cmp %l7, 14
>> 281 /* Soft-IRQ IPI */
>> 282 st %o2, [%o1 + 0x04] ! sun4m_irq_percpu[cpu]->clear=0x70000000
>> 283 WRITE_PAUSE
>> 284 ld [%o1 + 0x00], %g0 ! sun4m_irq_percpu[cpu]->pending
>> 285 WRITE_PAUSE
>> 286 or %l0, PSR_PIL, %l4
>> 287 wr %l4, 0x0, %psr
>> 288 WRITE_PAUSE
>> 289 wr %l4, PSR_ET, %psr
>> 290 WRITE_PAUSE
>> 291 srl %o3, 28, %o2 ! shift for simpler checks below
>> 292 maybe_smp4m_msg_check_single:
>> 293 andcc %o2, 0x1, %g0
>> 294 beq,a maybe_smp4m_msg_check_mask
>> 295 andcc %o2, 0x2, %g0
>> 296 call smp_call_function_single_interrupt
>> 297 nop
>> 298 andcc %o2, 0x2, %g0
>> 299 maybe_smp4m_msg_check_mask:
>> 300 beq,a maybe_smp4m_msg_check_resched
>> 301 andcc %o2, 0x4, %g0
>> 302 call smp_call_function_interrupt
>> 303 nop
>> 304 andcc %o2, 0x4, %g0
>> 305 maybe_smp4m_msg_check_resched:
>> 306 /* rescheduling is done in RESTORE_ALL regardless, but incr stats */
>> 307 beq,a maybe_smp4m_msg_out
>> 308 nop
>> 309 call smp_resched_interrupt
>> 310 nop
>> 311 maybe_smp4m_msg_out:
>> 312 RESTORE_ALL
>> 313
>> 314 .align 4
>> 315 .globl linux_trap_ipi15_sun4m
>> 316 linux_trap_ipi15_sun4m:
>> 317 SAVE_ALL
>> 318 sethi %hi(0x80000000), %o2
>> 319 GET_PROCESSOR4M_ID(o0)
>> 320 sethi %hi(sun4m_irq_percpu), %l5
>> 321 or %l5, %lo(sun4m_irq_percpu), %o5
>> 322 sll %o0, 2, %o0
>> 323 ld [%o5 + %o0], %o5
>> 324 ld [%o5 + 0x00], %o3 ! sun4m_irq_percpu[cpu]->pending
>> 325 andcc %o3, %o2, %g0
>> 326 be sun4m_nmi_error ! Must be an NMI async memory error
>> 327 st %o2, [%o5 + 0x04] ! sun4m_irq_percpu[cpu]->clear=0x80000000
>> 328 WRITE_PAUSE
>> 329 ld [%o5 + 0x00], %g0 ! sun4m_irq_percpu[cpu]->pending
>> 330 WRITE_PAUSE
>> 331 or %l0, PSR_PIL, %l4
>> 332 wr %l4, 0x0, %psr
>> 333 WRITE_PAUSE
>> 334 wr %l4, PSR_ET, %psr
>> 335 WRITE_PAUSE
>> 336 call smp4m_cross_call_irq
>> 337 nop
>> 338 b ret_trap_lockless_ipi
>> 339 clr %l6
>> 340
>> 341 .globl smp4d_ticker
>> 342 /* SMP per-cpu ticker interrupts are handled specially. */
>> 343 smp4d_ticker:
>> 344 SAVE_ALL
>> 345 or %l0, PSR_PIL, %g2
>> 346 sethi %hi(CC_ICLR), %o0
>> 347 sethi %hi(1 << 14), %o1
>> 348 or %o0, %lo(CC_ICLR), %o0
>> 349 stha %o1, [%o0] ASI_M_MXCC /* Clear PIL 14 in MXCC's ICLR */
>> 350 wr %g2, 0x0, %psr
>> 351 WRITE_PAUSE
>> 352 wr %g2, PSR_ET, %psr
>> 353 WRITE_PAUSE
>> 354 call smp4d_percpu_timer_interrupt
>> 355 add %sp, STACKFRAME_SZ, %o0
>> 356 wr %l0, PSR_ET, %psr
>> 357 WRITE_PAUSE
>> 358 RESTORE_ALL
>> 359
>> 360 .align 4
>> 361 .globl linux_trap_ipi15_sun4d
>> 362 linux_trap_ipi15_sun4d:
>> 363 SAVE_ALL
>> 364 sethi %hi(CC_BASE), %o4
>> 365 sethi %hi(MXCC_ERR_ME|MXCC_ERR_PEW|MXCC_ERR_ASE|MXCC_ERR_PEE), %o2
>> 366 or %o4, (CC_EREG - CC_BASE), %o0
>> 367 ldda [%o0] ASI_M_MXCC, %o0
>> 368 andcc %o0, %o2, %g0
>> 369 bne 1f
>> 370 sethi %hi(BB_STAT2), %o2
>> 371 lduba [%o2] ASI_M_CTL, %o2
>> 372 andcc %o2, BB_STAT2_MASK, %g0
>> 373 bne 2f
>> 374 or %o4, (CC_ICLR - CC_BASE), %o0
>> 375 sethi %hi(1 << 15), %o1
>> 376 stha %o1, [%o0] ASI_M_MXCC /* Clear PIL 15 in MXCC's ICLR */
>> 377 or %l0, PSR_PIL, %l4
>> 378 wr %l4, 0x0, %psr
>> 379 WRITE_PAUSE
>> 380 wr %l4, PSR_ET, %psr
>> 381 WRITE_PAUSE
>> 382 call smp4d_cross_call_irq
>> 383 nop
>> 384 b ret_trap_lockless_ipi
>> 385 clr %l6
>> 386
>> 387 1: /* MXCC error */
>> 388 2: /* BB error */
>> 389 /* Disable PIL 15 */
>> 390 set CC_IMSK, %l4
>> 391 lduha [%l4] ASI_M_MXCC, %l5
>> 392 sethi %hi(1 << 15), %l7
>> 393 or %l5, %l7, %l5
>> 394 stha %l5, [%l4] ASI_M_MXCC
>> 395 /* FIXME */
>> 396 1: b,a 1b
>> 397
>> 398 .globl smpleon_ipi
>> 399 .extern leon_ipi_interrupt
>> 400 /* SMP per-cpu IPI interrupts are handled specially. */
>> 401 smpleon_ipi:
>> 402 SAVE_ALL
>> 403 or %l0, PSR_PIL, %g2
>> 404 wr %g2, 0x0, %psr
>> 405 WRITE_PAUSE
>> 406 wr %g2, PSR_ET, %psr
>> 407 WRITE_PAUSE
>> 408 call leonsmp_ipi_interrupt
>> 409 add %sp, STACKFRAME_SZ, %o1 ! pt_regs
>> 410 wr %l0, PSR_ET, %psr
>> 411 WRITE_PAUSE
>> 412 RESTORE_ALL
>> 413
>> 414 .align 4
>> 415 .globl linux_trap_ipi15_leon
>> 416 linux_trap_ipi15_leon:
>> 417 SAVE_ALL
>> 418 or %l0, PSR_PIL, %l4
>> 419 wr %l4, 0x0, %psr
>> 420 WRITE_PAUSE
>> 421 wr %l4, PSR_ET, %psr
>> 422 WRITE_PAUSE
>> 423 call leon_cross_call_irq
>> 424 nop
>> 425 b ret_trap_lockless_ipi
>> 426 clr %l6
>> 427
>> 428 #endif /* CONFIG_SMP */
>> 429
>> 430 /* This routine handles illegal instructions and privileged
>> 431 * instruction attempts from user code.
>> 432 */
>> 433 .align 4
>> 434 .globl bad_instruction
>> 435 bad_instruction:
>> 436 sethi %hi(0xc1f80000), %l4
>> 437 ld [%l1], %l5
>> 438 sethi %hi(0x81d80000), %l7
>> 439 and %l5, %l4, %l5
>> 440 cmp %l5, %l7
>> 441 be 1f
>> 442 SAVE_ALL
>> 443
>> 444 wr %l0, PSR_ET, %psr ! re-enable traps
>> 445 WRITE_PAUSE
>> 446
>> 447 add %sp, STACKFRAME_SZ, %o0
>> 448 mov %l1, %o1
>> 449 mov %l2, %o2
>> 450 call do_illegal_instruction
>> 451 mov %l0, %o3
>> 452
>> 453 RESTORE_ALL
>> 454
>> 455 1: /* unimplemented flush - just skip */
>> 456 jmpl %l2, %g0
>> 457 rett %l2 + 4
>> 458
>> 459 .align 4
>> 460 .globl priv_instruction
>> 461 priv_instruction:
>> 462 SAVE_ALL
>> 463
>> 464 wr %l0, PSR_ET, %psr
>> 465 WRITE_PAUSE
>> 466
>> 467 add %sp, STACKFRAME_SZ, %o0
>> 468 mov %l1, %o1
>> 469 mov %l2, %o2
>> 470 call do_priv_instruction
>> 471 mov %l0, %o3
>> 472
>> 473 RESTORE_ALL
>> 474
>> 475 /* This routine handles unaligned data accesses. */
>> 476 .align 4
>> 477 .globl mna_handler
>> 478 mna_handler:
>> 479 andcc %l0, PSR_PS, %g0
>> 480 be mna_fromuser
>> 481 nop
>> 482
>> 483 SAVE_ALL
>> 484
>> 485 wr %l0, PSR_ET, %psr
>> 486 WRITE_PAUSE
>> 487
>> 488 ld [%l1], %o1
>> 489 call kernel_unaligned_trap
>> 490 add %sp, STACKFRAME_SZ, %o0
>> 491
>> 492 RESTORE_ALL
>> 493
>> 494 mna_fromuser:
>> 495 SAVE_ALL
>> 496
>> 497 wr %l0, PSR_ET, %psr ! re-enable traps
>> 498 WRITE_PAUSE
>> 499
>> 500 ld [%l1], %o1
>> 501 call user_unaligned_trap
>> 502 add %sp, STACKFRAME_SZ, %o0
>> 503
>> 504 RESTORE_ALL
>> 505
>> 506 /* This routine handles floating point disabled traps. */
>> 507 .align 4
>> 508 .globl fpd_trap_handler
>> 509 fpd_trap_handler:
>> 510 SAVE_ALL
>> 511
>> 512 wr %l0, PSR_ET, %psr ! re-enable traps
>> 513 WRITE_PAUSE
>> 514
>> 515 add %sp, STACKFRAME_SZ, %o0
>> 516 mov %l1, %o1
>> 517 mov %l2, %o2
>> 518 call do_fpd_trap
>> 519 mov %l0, %o3
>> 520
>> 521 RESTORE_ALL
>> 522
>> 523 /* This routine handles Floating Point Exceptions. */
>> 524 .align 4
>> 525 .globl fpe_trap_handler
>> 526 fpe_trap_handler:
>> 527 set fpsave_magic, %l5
>> 528 cmp %l1, %l5
>> 529 be 1f
>> 530 sethi %hi(fpsave), %l5
>> 531 or %l5, %lo(fpsave), %l5
>> 532 cmp %l1, %l5
>> 533 bne 2f
>> 534 sethi %hi(fpsave_catch2), %l5
>> 535 or %l5, %lo(fpsave_catch2), %l5
>> 536 wr %l0, 0x0, %psr
>> 537 WRITE_PAUSE
>> 538 jmp %l5
>> 539 rett %l5 + 4
>> 540 1:
>> 541 sethi %hi(fpsave_catch), %l5
>> 542 or %l5, %lo(fpsave_catch), %l5
>> 543 wr %l0, 0x0, %psr
>> 544 WRITE_PAUSE
>> 545 jmp %l5
>> 546 rett %l5 + 4
>> 547
>> 548 2:
>> 549 SAVE_ALL
>> 550
>> 551 wr %l0, PSR_ET, %psr ! re-enable traps
>> 552 WRITE_PAUSE
>> 553
>> 554 add %sp, STACKFRAME_SZ, %o0
>> 555 mov %l1, %o1
>> 556 mov %l2, %o2
>> 557 call do_fpe_trap
>> 558 mov %l0, %o3
>> 559
>> 560 RESTORE_ALL
>> 561
>> 562 /* This routine handles Tag Overflow Exceptions. */
>> 563 .align 4
>> 564 .globl do_tag_overflow
>> 565 do_tag_overflow:
>> 566 SAVE_ALL
>> 567
>> 568 wr %l0, PSR_ET, %psr ! re-enable traps
>> 569 WRITE_PAUSE
>> 570
>> 571 add %sp, STACKFRAME_SZ, %o0
>> 572 mov %l1, %o1
>> 573 mov %l2, %o2
>> 574 call handle_tag_overflow
>> 575 mov %l0, %o3
>> 576
>> 577 RESTORE_ALL
>> 578
>> 579 /* This routine handles Watchpoint Exceptions. */
>> 580 .align 4
>> 581 .globl do_watchpoint
>> 582 do_watchpoint:
>> 583 SAVE_ALL
>> 584
>> 585 wr %l0, PSR_ET, %psr ! re-enable traps
>> 586 WRITE_PAUSE
>> 587
>> 588 add %sp, STACKFRAME_SZ, %o0
>> 589 mov %l1, %o1
>> 590 mov %l2, %o2
>> 591 call handle_watchpoint
>> 592 mov %l0, %o3
>> 593
>> 594 RESTORE_ALL
>> 595
>> 596 /* This routine handles Register Access Exceptions. */
>> 597 .align 4
>> 598 .globl do_reg_access
>> 599 do_reg_access:
>> 600 SAVE_ALL
>> 601
>> 602 wr %l0, PSR_ET, %psr ! re-enable traps
>> 603 WRITE_PAUSE
>> 604
>> 605 add %sp, STACKFRAME_SZ, %o0
>> 606 mov %l1, %o1
>> 607 mov %l2, %o2
>> 608 call handle_reg_access
>> 609 mov %l0, %o3
>> 610
>> 611 RESTORE_ALL
>> 612
>> 613 /* This routine handles Co-Processor Disabled Exceptions. */
>> 614 .align 4
>> 615 .globl do_cp_disabled
>> 616 do_cp_disabled:
>> 617 SAVE_ALL
>> 618
>> 619 wr %l0, PSR_ET, %psr ! re-enable traps
>> 620 WRITE_PAUSE
>> 621
>> 622 add %sp, STACKFRAME_SZ, %o0
>> 623 mov %l1, %o1
>> 624 mov %l2, %o2
>> 625 call handle_cp_disabled
>> 626 mov %l0, %o3
>> 627
>> 628 RESTORE_ALL
>> 629
>> 630 /* This routine handles Co-Processor Exceptions. */
>> 631 .align 4
>> 632 .globl do_cp_exception
>> 633 do_cp_exception:
>> 634 SAVE_ALL
>> 635
>> 636 wr %l0, PSR_ET, %psr ! re-enable traps
>> 637 WRITE_PAUSE
>> 638
>> 639 add %sp, STACKFRAME_SZ, %o0
>> 640 mov %l1, %o1
>> 641 mov %l2, %o2
>> 642 call handle_cp_exception
>> 643 mov %l0, %o3
>> 644
>> 645 RESTORE_ALL
>> 646
>> 647 /* This routine handles Hardware Divide By Zero Exceptions. */
>> 648 .align 4
>> 649 .globl do_hw_divzero
>> 650 do_hw_divzero:
>> 651 SAVE_ALL
>> 652
>> 653 wr %l0, PSR_ET, %psr ! re-enable traps
>> 654 WRITE_PAUSE
>> 655
>> 656 add %sp, STACKFRAME_SZ, %o0
>> 657 mov %l1, %o1
>> 658 mov %l2, %o2
>> 659 call handle_hw_divzero
>> 660 mov %l0, %o3
>> 661
>> 662 RESTORE_ALL
>> 663
>> 664 .align 4
>> 665 .globl do_flush_windows
>> 666 do_flush_windows:
>> 667 SAVE_ALL
>> 668
>> 669 wr %l0, PSR_ET, %psr
>> 670 WRITE_PAUSE
>> 671
>> 672 andcc %l0, PSR_PS, %g0
>> 673 bne dfw_kernel
>> 674 nop
>> 675
>> 676 call flush_user_windows
>> 677 nop
>> 678
>> 679 /* Advance over the trap instruction. */
>> 680 ld [%sp + STACKFRAME_SZ + PT_NPC], %l1
>> 681 add %l1, 0x4, %l2
>> 682 st %l1, [%sp + STACKFRAME_SZ + PT_PC]
>> 683 st %l2, [%sp + STACKFRAME_SZ + PT_NPC]
>> 684
>> 685 RESTORE_ALL
>> 686
>> 687 .globl flush_patch_one
>> 688
>> 689 /* We get these for debugging routines using __builtin_return_address() */
>> 690 dfw_kernel:
>> 691 flush_patch_one:
>> 692 FLUSH_ALL_KERNEL_WINDOWS
>> 693
>> 694 /* Advance over the trap instruction. */
>> 695 ld [%sp + STACKFRAME_SZ + PT_NPC], %l1
>> 696 add %l1, 0x4, %l2
>> 697 st %l1, [%sp + STACKFRAME_SZ + PT_PC]
>> 698 st %l2, [%sp + STACKFRAME_SZ + PT_NPC]
>> 699
>> 700 RESTORE_ALL
>> 701
>> 702 /* The getcc software trap. The user wants the condition codes from
>> 703 * the %psr in register %g1.
>> 704 */
>> 705
>> 706 .align 4
>> 707 .globl getcc_trap_handler
>> 708 getcc_trap_handler:
>> 709 srl %l0, 20, %g1 ! give user
>> 710 and %g1, 0xf, %g1 ! only ICC bits in %psr
>> 711 jmp %l2 ! advance over trap instruction
>> 712 rett %l2 + 0x4 ! like this...
>> 713
>> 714 /* The setcc software trap. The user has condition codes in %g1
>> 715 * that it would like placed in the %psr. Be careful not to flip
>> 716 * any unintentional bits!
>> 717 */
>> 718
>> 719 .align 4
>> 720 .globl setcc_trap_handler
>> 721 setcc_trap_handler:
>> 722 sll %g1, 0x14, %l4
>> 723 set PSR_ICC, %l5
>> 724 andn %l0, %l5, %l0 ! clear ICC bits in %psr
>> 725 and %l4, %l5, %l4 ! clear non-ICC bits in user value
>> 726 or %l4, %l0, %l4 ! or them in... mix mix mix
>> 727
>> 728 wr %l4, 0x0, %psr ! set new %psr
>> 729 WRITE_PAUSE ! TI scumbags...
>> 730
>> 731 jmp %l2 ! advance over trap instruction
>> 732 rett %l2 + 0x4 ! like this...
>> 733
>> 734 sun4m_nmi_error:
>> 735 /* NMI async memory error handling. */
>> 736 sethi %hi(0x80000000), %l4
>> 737 sethi %hi(sun4m_irq_global), %o5
>> 738 ld [%o5 + %lo(sun4m_irq_global)], %l5
>> 739 st %l4, [%l5 + 0x0c] ! sun4m_irq_global->mask_set=0x80000000
>> 740 WRITE_PAUSE
>> 741 ld [%l5 + 0x00], %g0 ! sun4m_irq_global->pending
>> 742 WRITE_PAUSE
>> 743 or %l0, PSR_PIL, %l4
>> 744 wr %l4, 0x0, %psr
>> 745 WRITE_PAUSE
>> 746 wr %l4, PSR_ET, %psr
>> 747 WRITE_PAUSE
>> 748 call sun4m_nmi
>> 749 nop
>> 750 st %l4, [%l5 + 0x08] ! sun4m_irq_global->mask_clear=0x80000000
>> 751 WRITE_PAUSE
>> 752 ld [%l5 + 0x00], %g0 ! sun4m_irq_global->pending
>> 753 WRITE_PAUSE
>> 754 RESTORE_ALL
>> 755
>> 756 #ifndef CONFIG_SMP
>> 757 .align 4
>> 758 .globl linux_trap_ipi15_sun4m
>> 759 linux_trap_ipi15_sun4m:
>> 760 SAVE_ALL
>> 761
>> 762 ba sun4m_nmi_error
>> 763 nop
>> 764 #endif /* CONFIG_SMP */
>> 765
>> 766 .align 4
>> 767 .globl srmmu_fault
>> 768 srmmu_fault:
>> 769 mov 0x400, %l5
>> 770 mov 0x300, %l4
>> 771
>> 772 LEON_PI(lda [%l5] ASI_LEON_MMUREGS, %l6) ! read sfar first
>> 773 SUN_PI_(lda [%l5] ASI_M_MMUREGS, %l6) ! read sfar first
>> 774
>> 775 LEON_PI(lda [%l4] ASI_LEON_MMUREGS, %l5) ! read sfsr last
>> 776 SUN_PI_(lda [%l4] ASI_M_MMUREGS, %l5) ! read sfsr last
>> 777
>> 778 andn %l6, 0xfff, %l6
>> 779 srl %l5, 6, %l5 ! and encode all info into l7
>> 780
>> 781 and %l5, 2, %l5
>> 782 or %l5, %l6, %l6
>> 783
>> 784 or %l6, %l7, %l7 ! l7 = [addr,write,txtfault]
>> 785
>> 786 SAVE_ALL
>> 787
>> 788 mov %l7, %o1
>> 789 mov %l7, %o2
>> 790 and %o1, 1, %o1 ! arg2 = text_faultp
>> 791 mov %l7, %o3
>> 792 and %o2, 2, %o2 ! arg3 = writep
>> 793 andn %o3, 0xfff, %o3 ! arg4 = faulting address
>> 794
>> 795 wr %l0, PSR_ET, %psr
>> 796 WRITE_PAUSE
>> 797
>> 798 call do_sparc_fault
>> 799 add %sp, STACKFRAME_SZ, %o0 ! arg1 = pt_regs ptr
>> 800
>> 801 RESTORE_ALL
>> 802
>> 803 .align 4
>> 804 sunos_execv:
>> 805 .globl sunos_execv
>> 806 b sys_execve
>> 807 clr %i2
>> 808
>> 809 .align 4
>> 810 .globl sys_sigstack
>> 811 sys_sigstack:
>> 812 mov %o7, %l5
>> 813 mov %fp, %o2
>> 814 call do_sys_sigstack
>> 815 mov %l5, %o7
>> 816
>> 817 .align 4
>> 818 .globl sys_sigreturn
>> 819 sys_sigreturn:
>> 820 call do_sigreturn
>> 821 add %sp, STACKFRAME_SZ, %o0
>> 822
>> 823 ld [%curptr + TI_FLAGS], %l5
>> 824 andcc %l5, _TIF_SYSCALL_TRACE, %g0
>> 825 be 1f
>> 826 nop
58 827
59 jl.d [r14] ; kernel threa !! 828 call syscall_trace
60 mov r0, r13 ; (see PF_KTHR !! 829 mov 1, %o1
61 830
62 1: 831 1:
63 ; Return to user space !! 832 /* We don't want to muck with user registers like a
64 ; 1. Any forked task (Reach here via B !! 833 * normal syscall, just return.
65 ; 2. First ever init task (Reach here !! 834 */
66 ; This is the historic "kernel_exec !! 835 RESTORE_ALL
67 ; user mode, in a round about way s !! 836
68 ; a kernel thread which is executed !! 837 .align 4
69 ; out whenever kernel_execve (now i !! 838 .globl sys_rt_sigreturn
70 b ret_from_exception !! 839 sys_rt_sigreturn:
71 END(ret_from_fork) !! 840 call do_rt_sigreturn
72 !! 841 add %sp, STACKFRAME_SZ, %o0
73 ;################### Non TLB Exception Handlin !! 842
74 !! 843 ld [%curptr + TI_FLAGS], %l5
75 ; -------------------------------------------- !! 844 andcc %l5, _TIF_SYSCALL_TRACE, %g0
76 ; Instruction Error Exception Handler !! 845 be 1f
77 ; -------------------------------------------- !! 846 nop
78 !! 847
79 ENTRY(instr_service) !! 848 add %sp, STACKFRAME_SZ, %o0
80 !! 849 call syscall_trace
81 EXCEPTION_PROLOGUE !! 850 mov 1, %o1
82 <<
83 bl do_insterror_or_kprobe <<
84 b ret_from_exception <<
85 END(instr_service) <<
86 <<
87 ; -------------------------------------------- <<
88 ; Machine Check Exception Handler <<
89 ; -------------------------------------------- <<
90 <<
91 ENTRY(EV_MachineCheck) <<
92 <<
93 EXCEPTION_PROLOGUE_KEEP_AE ; ECR <<
94 <<
95 lr r0, [efa] <<
96 mov r1, sp <<
97 <<
98 ; MC exceptions disable MMU <<
99 ARC_MMU_REENABLE r3 <<
100 <<
101 lsr r3, r10, 8 <<
102 bmsk r3, r3, 7 <<
103 brne r3, ECR_C_MCHK_DUP_TLB, 1f <<
104 <<
105 bl do_tlb_overlap_fault <<
106 b ret_from_exception <<
107 851
108 1: 852 1:
109 ; DEAD END: can't do much, display Reg !! 853 /* We are returning to a signal handler. */
110 SAVE_CALLEE_SAVED_USER !! 854 RESTORE_ALL
111 <<
112 GET_CURR_TASK_FIELD_PTR TASK_THREAD, <<
113 st sp, [r10, THREAD_CALLEE_REG] <<
114 <<
115 j do_machine_check_fault <<
116 <<
117 END(EV_MachineCheck) <<
118 <<
119 ; -------------------------------------------- <<
120 ; Privilege Violation Exception Handler <<
121 ; -------------------------------------------- <<
122 ENTRY(EV_PrivilegeV) <<
123 <<
124 EXCEPTION_PROLOGUE <<
125 <<
126 bl do_privilege_fault <<
127 b ret_from_exception <<
128 END(EV_PrivilegeV) <<
129 <<
130 ; -------------------------------------------- <<
131 ; Extension Instruction Exception Handler <<
132 ; -------------------------------------------- <<
133 ENTRY(EV_Extension) <<
134 <<
135 EXCEPTION_PROLOGUE <<
136 <<
137 bl do_extension_fault <<
138 b ret_from_exception <<
139 END(EV_Extension) <<
140 <<
141 ;################ Trap Handling (Syscall, Brea <<
142 <<
143 ; -------------------------------------------- <<
144 ; syscall Tracing <<
145 ; -------------------------------------------- <<
146 tracesys: <<
147 ; safekeep EFA (r12) if syscall tracer <<
148 ; for traps, ERET is pre-commit so poi <<
149 GET_CURR_TASK_FIELD_PTR TASK_THREAD, <<
150 st r12, [r11, THREAD_FAULT_ADDR] <<
151 <<
152 ; PRE syscall trace hook <<
153 mov r0, sp <<
154 bl @syscall_trace_enter <<
155 <<
156 ; Tracing code now returns the syscall <<
157 mov r8, r0 <<
158 <<
159 ; Do the Sys Call as we normally would <<
160 cmp r8, NR_syscalls - 1 <<
161 mov.hi r0, -ENOSYS <<
162 bhi tracesys_exit <<
163 <<
164 ; Restore the sys-call args. Mere invo <<
165 ; clobbered them (since they are in sc <<
166 ; have deliberately changed the syscal <<
167 ld r0, [sp, PT_r0] <<
168 ld r1, [sp, PT_r1] <<
169 ld r2, [sp, PT_r2] <<
170 ld r3, [sp, PT_r3] <<
171 ld r4, [sp, PT_r4] <<
172 ld r5, [sp, PT_r5] <<
173 ld r6, [sp, PT_r6] <<
174 ld r7, [sp, PT_r7] <<
175 ld.as r9, [sys_call_table, r8] <<
176 jl [r9] <<
177 <<
178 tracesys_exit: <<
179 st r0, [sp, PT_r0] <<
180 <<
181 ; POST syscall trace hook <<
182 mov r0, sp ; pt_regs need <<
183 bl @syscall_trace_exit <<
184 <<
185 ; don't call ret_from_system_call as i <<
186 b ret_from_exception <<
187 <<
188 ; -------------------------------------------- <<
189 ; Breakpoint TRAP <<
190 ; -------------------------------------------- <<
191 trap_with_param: <<
192 mov r0, r12 ; EFA in case ptracer/ <<
193 mov r1, sp ; pt_regs <<
194 <<
195 ; save callee regs in case tracer/gdb <<
196 SAVE_CALLEE_SAVED_USER <<
197 <<
198 ; safekeep ref to callee regs <<
199 GET_CURR_TASK_FIELD_PTR TASK_THREAD, <<
200 st sp, [r10, THREAD_CALLEE_REG] <<
201 <<
202 ; call the non syscall trap handler <<
203 bl do_non_swi_trap <<
204 855
205 ; unwind stack to discard callee regs !! 856 /* Now that we have a real sys_clone, sys_fork() is
206 DISCARD_CALLEE_SAVED_USER !! 857 * implemented in terms of it. Our _real_ implementation
207 !! 858 * of SunOS vfork() will use sys_vfork().
208 b ret_from_exception !! 859 *
209 !! 860 * XXX These three should be consolidated into mostly shared
210 ; -------------------------------------------- !! 861 * XXX code just like on sparc64... -DaveM
211 ; syscall TRAP !! 862 */
212 ; ABI: (r0-r7) up to 8 args, (r8) syscall numb !! 863 .align 4
213 ; -------------------------------------------- !! 864 .globl sys_fork, flush_patch_two
214 !! 865 sys_fork:
215 ENTRY(EV_Trap) !! 866 mov %o7, %l5
216 !! 867 flush_patch_two:
217 EXCEPTION_PROLOGUE_KEEP_AE !! 868 FLUSH_ALL_KERNEL_WINDOWS;
218 !! 869 ld [%curptr + TI_TASK], %o4
219 lr r12, [efa] !! 870 rd %psr, %g4
220 !! 871 WRITE_PAUSE
221 FAKE_RET_FROM_EXCPN !! 872 rd %wim, %g5
222 !! 873 WRITE_PAUSE
223 ;============ TRAP N : breakpoints, kp !! 874 std %g4, [%o4 + AOFF_task_thread + AOFF_thread_fork_kpsr]
224 bmsk.f 0, r10, 7 !! 875 add %sp, STACKFRAME_SZ, %o0
225 bnz trap_with_param !! 876 call sparc_fork
226 !! 877 mov %l5, %o7
227 ;============ TRAP 0 (no param): sysca !! 878
228 !! 879 /* Whee, kernel threads! */
229 ; syscall tracing ongoing, invoke pre- !! 880 .globl sys_clone, flush_patch_three
230 GET_CURR_THR_INFO_FLAGS r10 !! 881 sys_clone:
231 and.f 0, r10, _TIF_SYSCALL_WORK !! 882 mov %o7, %l5
232 bnz tracesys ; this never comes bac !! 883 flush_patch_three:
233 !! 884 FLUSH_ALL_KERNEL_WINDOWS;
234 ;============ Normal syscall case !! 885 ld [%curptr + TI_TASK], %o4
235 !! 886 rd %psr, %g4
236 cmp r8, NR_syscalls - 1 !! 887 WRITE_PAUSE
237 mov.hi r0, -ENOSYS !! 888 rd %wim, %g5
238 bhi .Lret_from_system_call !! 889 WRITE_PAUSE
239 !! 890 std %g4, [%o4 + AOFF_task_thread + AOFF_thread_fork_kpsr]
240 ld.as r9,[sys_call_table, r8] !! 891 add %sp, STACKFRAME_SZ, %o0
241 jl [r9] !! 892 call sparc_clone
242 !! 893 mov %l5, %o7
243 .Lret_from_system_call: !! 894
244 st r0, [sp, PT_r0] ; sys call ret !! 895 /* Whee, real vfork! */
245 !! 896 .globl sys_vfork, flush_patch_four
246 ; fall through to ret_from_exception !! 897 sys_vfork:
247 END(EV_Trap) !! 898 flush_patch_four:
248 !! 899 FLUSH_ALL_KERNEL_WINDOWS;
249 ;############# Return from Intr/Excp/Trap (Lin !! 900 ld [%curptr + TI_TASK], %o4
250 ; !! 901 rd %psr, %g4
251 ; If ret to user mode do we need to handle sig !! 902 WRITE_PAUSE
252 !! 903 rd %wim, %g5
253 ENTRY(ret_from_exception) !! 904 WRITE_PAUSE
254 !! 905 std %g4, [%o4 + AOFF_task_thread + AOFF_thread_fork_kpsr]
255 ; Pre-{IRQ,Trap,Exception} K/U mode fr !! 906 sethi %hi(sparc_vfork), %l1
256 ld r8, [sp, PT_status32] ; returnin !! 907 jmpl %l1 + %lo(sparc_vfork), %g0
257 !! 908 add %sp, STACKFRAME_SZ, %o0
258 bbit0 r8, STATUS_U_BIT, resume_kernel !! 909
259 !! 910 .align 4
260 ; Before returning to User mode check- !! 911 linux_sparc_ni_syscall:
261 ; such as rescheduling/signal-delivery !! 912 sethi %hi(sys_ni_syscall), %l7
262 resume_user_mode_begin: !! 913 b do_syscall
263 !! 914 or %l7, %lo(sys_ni_syscall), %l7
264 ; Disable IRQs to ensures that chk for !! 915
265 ; (and we don't end up missing a NEED_ !! 916 linux_syscall_trace:
266 ; interim IRQ). !! 917 add %sp, STACKFRAME_SZ, %o0
267 IRQ_DISABLE r10 !! 918 call syscall_trace
268 !! 919 mov 0, %o1
269 ; Fast Path return to user mode if no !! 920 cmp %o0, 0
270 GET_CURR_THR_INFO_FLAGS r9 !! 921 bne 3f
271 and.f 0, r9, _TIF_WORK_MASK !! 922 mov -ENOSYS, %o0
272 bz .Lrestore_regs !! 923
273 !! 924 /* Syscall tracing can modify the registers. */
274 ; --- (Slow Path #1) task preemption - !! 925 ld [%sp + STACKFRAME_SZ + PT_G1], %g1
275 bbit0 r9, TIF_NEED_RESCHED, .Lchk_pen !! 926 sethi %hi(sys_call_table), %l7
276 mov blink, resume_user_mode_begin !! 927 ld [%sp + STACKFRAME_SZ + PT_I0], %i0
277 j @schedule ; BTST+Bnz cau !! 928 or %l7, %lo(sys_call_table), %l7
278 !! 929 ld [%sp + STACKFRAME_SZ + PT_I1], %i1
279 .Lchk_pend_signals: !! 930 ld [%sp + STACKFRAME_SZ + PT_I2], %i2
280 IRQ_ENABLE r10 !! 931 ld [%sp + STACKFRAME_SZ + PT_I3], %i3
281 !! 932 ld [%sp + STACKFRAME_SZ + PT_I4], %i4
282 ; --- (Slow Path #2) pending signal - !! 933 ld [%sp + STACKFRAME_SZ + PT_I5], %i5
283 mov r0, sp ; pt_regs for arg to d !! 934 cmp %g1, NR_syscalls
284 !! 935 bgeu 3f
285 GET_CURR_THR_INFO_FLAGS r9 !! 936 mov -ENOSYS, %o0
286 and.f 0, r9, _TIF_SIGPENDING|_TIF_NO !! 937
287 bz .Lchk_notify_resume !! 938 sll %g1, 2, %l4
288 !! 939 mov %i0, %o0
289 ; Normal Trap/IRQ entry only saves Scr !! 940 ld [%l7 + %l4], %l7
290 ; in pt_reg since the "C" ABI (kernel !! 941 mov %i1, %o1
291 ; save/restore callee-saved regs. !! 942 mov %i2, %o2
292 ; !! 943 mov %i3, %o3
293 ; However, here we need to explicitly !! 944 b 2f
294 ; (i) If this signal causes coredump !! 945 mov %i4, %o4
295 ; (ii) If signal is SIGTRAP/SIGSTOP, t !! 946
296 ; tracer might call PEEKUSR(CALLE !! 947 .globl ret_from_fork
297 ; !! 948 ret_from_fork:
298 ; NOTE: SP will grow up by size of CAL !! 949 call schedule_tail
299 SAVE_CALLEE_SAVED_USER !! 950 ld [%g3 + TI_TASK], %o0
300 !! 951 b ret_sys_call
301 ; save location of saved Callee Regs @ !! 952 ld [%sp + STACKFRAME_SZ + PT_I0], %o0
302 GET_CURR_TASK_FIELD_PTR TASK_THREAD, !! 953
303 st sp, [r10, THREAD_CALLEE_REG] !! 954 .globl ret_from_kernel_thread
304 !! 955 ret_from_kernel_thread:
305 bl @do_signal !! 956 call schedule_tail
306 !! 957 ld [%g3 + TI_TASK], %o0
307 ; Ideally we want to discard the Calle !! 958 ld [%sp + STACKFRAME_SZ + PT_G1], %l0
308 ; a tracing signal, tracer could have !! 959 call %l0
309 RESTORE_CALLEE_SAVED_USER !! 960 ld [%sp + STACKFRAME_SZ + PT_G2], %o0
>> 961 rd %psr, %l1
>> 962 ld [%sp + STACKFRAME_SZ + PT_PSR], %l0
>> 963 andn %l0, PSR_CWP, %l0
>> 964 nop
>> 965 and %l1, PSR_CWP, %l1
>> 966 or %l0, %l1, %l0
>> 967 st %l0, [%sp + STACKFRAME_SZ + PT_PSR]
>> 968 b ret_sys_call
>> 969 mov 0, %o0
>> 970
>> 971 /* Linux native system calls enter here... */
>> 972 .align 4
>> 973 .globl linux_sparc_syscall
>> 974 linux_sparc_syscall:
>> 975 sethi %hi(PSR_SYSCALL), %l4
>> 976 or %l0, %l4, %l0
>> 977 /* Direct access to user regs, must faster. */
>> 978 cmp %g1, NR_syscalls
>> 979 bgeu linux_sparc_ni_syscall
>> 980 sll %g1, 2, %l4
>> 981 ld [%l7 + %l4], %l7
>> 982
>> 983 do_syscall:
>> 984 SAVE_ALL_HEAD
>> 985 rd %wim, %l3
>> 986
>> 987 wr %l0, PSR_ET, %psr
>> 988 mov %i0, %o0
>> 989 mov %i1, %o1
>> 990 mov %i2, %o2
>> 991
>> 992 ld [%curptr + TI_FLAGS], %l5
>> 993 mov %i3, %o3
>> 994 andcc %l5, _TIF_SYSCALL_TRACE, %g0
>> 995 mov %i4, %o4
>> 996 bne linux_syscall_trace
>> 997 mov %i0, %l6
>> 998 2:
>> 999 call %l7
>> 1000 mov %i5, %o5
>> 1001
>> 1002 3:
>> 1003 st %o0, [%sp + STACKFRAME_SZ + PT_I0]
>> 1004
>> 1005 ret_sys_call:
>> 1006 ld [%curptr + TI_FLAGS], %l5
>> 1007 cmp %o0, -ERESTART_RESTARTBLOCK
>> 1008 ld [%sp + STACKFRAME_SZ + PT_PSR], %g3
>> 1009 set PSR_C, %g2
>> 1010 bgeu 1f
>> 1011 andcc %l5, _TIF_SYSCALL_TRACE, %g0
>> 1012
>> 1013 /* System call success, clear Carry condition code. */
>> 1014 andn %g3, %g2, %g3
>> 1015 st %g3, [%sp + STACKFRAME_SZ + PT_PSR]
>> 1016 bne linux_syscall_trace2
>> 1017 ld [%sp + STACKFRAME_SZ + PT_NPC], %l1 /* pc = npc */
>> 1018 add %l1, 0x4, %l2 /* npc = npc+4 */
>> 1019 st %l1, [%sp + STACKFRAME_SZ + PT_PC]
>> 1020 b ret_trap_entry
>> 1021 st %l2, [%sp + STACKFRAME_SZ + PT_NPC]
>> 1022 1:
>> 1023 /* System call failure, set Carry condition code.
>> 1024 * Also, get abs(errno) to return to the process.
>> 1025 */
>> 1026 sub %g0, %o0, %o0
>> 1027 or %g3, %g2, %g3
>> 1028 st %o0, [%sp + STACKFRAME_SZ + PT_I0]
>> 1029 st %g3, [%sp + STACKFRAME_SZ + PT_PSR]
>> 1030 bne linux_syscall_trace2
>> 1031 ld [%sp + STACKFRAME_SZ + PT_NPC], %l1 /* pc = npc */
>> 1032 add %l1, 0x4, %l2 /* npc = npc+4 */
>> 1033 st %l1, [%sp + STACKFRAME_SZ + PT_PC]
>> 1034 b ret_trap_entry
>> 1035 st %l2, [%sp + STACKFRAME_SZ + PT_NPC]
>> 1036
>> 1037 linux_syscall_trace2:
>> 1038 add %sp, STACKFRAME_SZ, %o0
>> 1039 mov 1, %o1
>> 1040 call syscall_trace
>> 1041 add %l1, 0x4, %l2 /* npc = npc+4 */
>> 1042 st %l1, [%sp + STACKFRAME_SZ + PT_PC]
>> 1043 b ret_trap_entry
>> 1044 st %l2, [%sp + STACKFRAME_SZ + PT_NPC]
310 1045
311 b resume_user_mode_begin ; loop <<
312 1046
313 ; --- (Slow Path #3) notify_resume --- !! 1047 /* Saving and restoring the FPU state is best done from lowlevel code.
314 .Lchk_notify_resume: !! 1048 *
315 btst r9, TIF_NOTIFY_RESUME !! 1049 * void fpsave(unsigned long *fpregs, unsigned long *fsr,
316 blnz @do_notify_resume !! 1050 * void *fpqueue, unsigned long *fpqdepth)
317 b resume_user_mode_begin ; unco !! 1051 */
318 ; for <<
319 1052
320 resume_kernel_mode: !! 1053 .globl fpsave
>> 1054 fpsave:
>> 1055 st %fsr, [%o1] ! this can trap on us if fpu is in bogon state
>> 1056 ld [%o1], %g1
>> 1057 set 0x2000, %g4
>> 1058 andcc %g1, %g4, %g0
>> 1059 be 2f
>> 1060 mov 0, %g2
321 1061
322 ; Disable Interrupts from this point o !! 1062 /* We have an fpqueue to save. */
323 ; CONFIG_PREEMPTION: This is a must fo !! 1063 1:
324 ; !CONFIG_PREEMPTION: To ensure restor !! 1064 std %fq, [%o2]
325 IRQ_DISABLE r9 !! 1065 fpsave_magic:
>> 1066 st %fsr, [%o1]
>> 1067 ld [%o1], %g3
>> 1068 andcc %g3, %g4, %g0
>> 1069 add %g2, 1, %g2
>> 1070 bne 1b
>> 1071 add %o2, 8, %o2
>> 1072
>> 1073 2:
>> 1074 st %g2, [%o3]
>> 1075
>> 1076 std %f0, [%o0 + 0x00]
>> 1077 std %f2, [%o0 + 0x08]
>> 1078 std %f4, [%o0 + 0x10]
>> 1079 std %f6, [%o0 + 0x18]
>> 1080 std %f8, [%o0 + 0x20]
>> 1081 std %f10, [%o0 + 0x28]
>> 1082 std %f12, [%o0 + 0x30]
>> 1083 std %f14, [%o0 + 0x38]
>> 1084 std %f16, [%o0 + 0x40]
>> 1085 std %f18, [%o0 + 0x48]
>> 1086 std %f20, [%o0 + 0x50]
>> 1087 std %f22, [%o0 + 0x58]
>> 1088 std %f24, [%o0 + 0x60]
>> 1089 std %f26, [%o0 + 0x68]
>> 1090 std %f28, [%o0 + 0x70]
>> 1091 retl
>> 1092 std %f30, [%o0 + 0x78]
>> 1093
>> 1094 /* Thanks for Theo Deraadt and the authors of the Sprite/netbsd/openbsd
>> 1095 * code for pointing out this possible deadlock, while we save state
>> 1096 * above we could trap on the fsr store so our low level fpu trap
>> 1097 * code has to know how to deal with this.
>> 1098 */
>> 1099 fpsave_catch:
>> 1100 b fpsave_magic + 4
>> 1101 st %fsr, [%o1]
>> 1102
>> 1103 fpsave_catch2:
>> 1104 b fpsave + 4
>> 1105 st %fsr, [%o1]
>> 1106
>> 1107 /* void fpload(unsigned long *fpregs, unsigned long *fsr); */
>> 1108
>> 1109 .globl fpload
>> 1110 fpload:
>> 1111 ldd [%o0 + 0x00], %f0
>> 1112 ldd [%o0 + 0x08], %f2
>> 1113 ldd [%o0 + 0x10], %f4
>> 1114 ldd [%o0 + 0x18], %f6
>> 1115 ldd [%o0 + 0x20], %f8
>> 1116 ldd [%o0 + 0x28], %f10
>> 1117 ldd [%o0 + 0x30], %f12
>> 1118 ldd [%o0 + 0x38], %f14
>> 1119 ldd [%o0 + 0x40], %f16
>> 1120 ldd [%o0 + 0x48], %f18
>> 1121 ldd [%o0 + 0x50], %f20
>> 1122 ldd [%o0 + 0x58], %f22
>> 1123 ldd [%o0 + 0x60], %f24
>> 1124 ldd [%o0 + 0x68], %f26
>> 1125 ldd [%o0 + 0x70], %f28
>> 1126 ldd [%o0 + 0x78], %f30
>> 1127 ld [%o1], %fsr
>> 1128 retl
>> 1129 nop
>> 1130
>> 1131 /* __ndelay and __udelay take two arguments:
>> 1132 * 0 - nsecs or usecs to delay
>> 1133 * 1 - per_cpu udelay_val (loops per jiffy)
>> 1134 *
>> 1135 * Note that ndelay gives HZ times higher resolution but has a 10ms
>> 1136 * limit. udelay can handle up to 1s.
>> 1137 */
>> 1138 .globl __ndelay
>> 1139 __ndelay:
>> 1140 save %sp, -STACKFRAME_SZ, %sp
>> 1141 mov %i0, %o0 ! round multiplier up so large ns ok
>> 1142 mov 0x1ae, %o1 ! 2**32 / (1 000 000 000 / HZ)
>> 1143 umul %o0, %o1, %o0
>> 1144 rd %y, %o1
>> 1145 mov %i1, %o1 ! udelay_val
>> 1146 umul %o0, %o1, %o0
>> 1147 rd %y, %o1
>> 1148 ba delay_continue
>> 1149 mov %o1, %o0 ! >>32 later for better resolution
>> 1150
>> 1151 .globl __udelay
>> 1152 __udelay:
>> 1153 save %sp, -STACKFRAME_SZ, %sp
>> 1154 mov %i0, %o0
>> 1155 sethi %hi(0x10c7), %o1 ! round multiplier up so large us ok
>> 1156 or %o1, %lo(0x10c7), %o1 ! 2**32 / 1 000 000
>> 1157 umul %o0, %o1, %o0
>> 1158 rd %y, %o1
>> 1159 mov %i1, %o1 ! udelay_val
>> 1160 umul %o0, %o1, %o0
>> 1161 rd %y, %o1
>> 1162 sethi %hi(0x028f4b62), %l0 ! Add in rounding constant * 2**32,
>> 1163 or %g0, %lo(0x028f4b62), %l0
>> 1164 addcc %o0, %l0, %o0 ! 2**32 * 0.009 999
>> 1165 bcs,a 3f
>> 1166 add %o1, 0x01, %o1
>> 1167 3:
>> 1168 mov HZ, %o0 ! >>32 earlier for wider range
>> 1169 umul %o0, %o1, %o0
>> 1170 rd %y, %o1
326 1171
327 #ifdef CONFIG_PREEMPTION !! 1172 delay_continue:
>> 1173 cmp %o0, 0x0
>> 1174 1:
>> 1175 bne 1b
>> 1176 subcc %o0, 1, %o0
>> 1177
>> 1178 ret
>> 1179 restore
>> 1180 EXPORT_SYMBOL(__udelay)
>> 1181 EXPORT_SYMBOL(__ndelay)
>> 1182
>> 1183 /* Handle a software breakpoint */
>> 1184 /* We have to inform parent that child has stopped */
>> 1185 .align 4
>> 1186 .globl breakpoint_trap
>> 1187 breakpoint_trap:
>> 1188 rd %wim,%l3
>> 1189 SAVE_ALL
>> 1190 wr %l0, PSR_ET, %psr
>> 1191 WRITE_PAUSE
>> 1192
>> 1193 st %i0, [%sp + STACKFRAME_SZ + PT_G0] ! for restarting syscalls
>> 1194 call sparc_breakpoint
>> 1195 add %sp, STACKFRAME_SZ, %o0
>> 1196
>> 1197 RESTORE_ALL
>> 1198
>> 1199 #ifdef CONFIG_KGDB
>> 1200 ENTRY(kgdb_trap_low)
>> 1201 rd %wim,%l3
>> 1202 SAVE_ALL
>> 1203 wr %l0, PSR_ET, %psr
>> 1204 WRITE_PAUSE
>> 1205
>> 1206 mov %l7, %o0 ! trap_level
>> 1207 call kgdb_trap
>> 1208 add %sp, STACKFRAME_SZ, %o1 ! struct pt_regs *regs
328 1209
329 ; Can't preempt if preemption disabled !! 1210 RESTORE_ALL
330 GET_CURR_THR_INFO_FROM_SP r10 !! 1211 ENDPROC(kgdb_trap_low)
331 ld r8, [r10, THREAD_INFO_PREEMPT_COUN !! 1212 #endif
332 brne r8, 0, .Lrestore_regs <<
333 1213
334 ; check if this task's NEED_RESCHED fl !! 1214 .align 4
335 ld r9, [r10, THREAD_INFO_FLAGS] !! 1215 .globl flush_patch_exception
336 bbit0 r9, TIF_NEED_RESCHED, .Lrestore !! 1216 flush_patch_exception:
>> 1217 FLUSH_ALL_KERNEL_WINDOWS;
>> 1218 ldd [%o0], %o6
>> 1219 jmpl %o7 + 0xc, %g0 ! see asm-sparc/processor.h
>> 1220 mov 1, %g1 ! signal EFAULT condition
>> 1221
>> 1222 .align 4
>> 1223 .globl kill_user_windows, kuw_patch1_7win
>> 1224 .globl kuw_patch1
>> 1225 kuw_patch1_7win: sll %o3, 6, %o3
>> 1226
>> 1227 /* No matter how much overhead this routine has in the worst
>> 1228 * case scenario, it is several times better than taking the
>> 1229 * traps with the old method of just doing flush_user_windows().
>> 1230 */
>> 1231 kill_user_windows:
>> 1232 ld [%g6 + TI_UWINMASK], %o0 ! get current umask
>> 1233 orcc %g0, %o0, %g0 ! if no bits set, we are done
>> 1234 be 3f ! nothing to do
>> 1235 rd %psr, %o5 ! must clear interrupts
>> 1236 or %o5, PSR_PIL, %o4 ! or else that could change
>> 1237 wr %o4, 0x0, %psr ! the uwinmask state
>> 1238 WRITE_PAUSE ! burn them cycles
>> 1239 1:
>> 1240 ld [%g6 + TI_UWINMASK], %o0 ! get consistent state
>> 1241 orcc %g0, %o0, %g0 ! did an interrupt come in?
>> 1242 be 4f ! yep, we are done
>> 1243 rd %wim, %o3 ! get current wim
>> 1244 srl %o3, 1, %o4 ! simulate a save
>> 1245 kuw_patch1:
>> 1246 sll %o3, 7, %o3 ! compute next wim
>> 1247 or %o4, %o3, %o3 ! result
>> 1248 andncc %o0, %o3, %o0 ! clean this bit in umask
>> 1249 bne kuw_patch1 ! not done yet
>> 1250 srl %o3, 1, %o4 ! begin another save simulation
>> 1251 wr %o3, 0x0, %wim ! set the new wim
>> 1252 st %g0, [%g6 + TI_UWINMASK] ! clear uwinmask
>> 1253 4:
>> 1254 wr %o5, 0x0, %psr ! re-enable interrupts
>> 1255 WRITE_PAUSE ! burn baby burn
>> 1256 3:
>> 1257 retl ! return
>> 1258 st %g0, [%g6 + TI_W_SAVED] ! no windows saved
>> 1259
>> 1260 .align 4
>> 1261 .globl restore_current
>> 1262 restore_current:
>> 1263 LOAD_CURRENT(g6, o0)
>> 1264 retl
>> 1265 nop
>> 1266
>> 1267 #ifdef CONFIG_PCIC_PCI
>> 1268 #include <asm/pcic.h>
>> 1269
>> 1270 .align 4
>> 1271 .globl linux_trap_ipi15_pcic
>> 1272 linux_trap_ipi15_pcic:
>> 1273 rd %wim, %l3
>> 1274 SAVE_ALL
>> 1275
>> 1276 /*
>> 1277 * First deactivate NMI
>> 1278 * or we cannot drop ET, cannot get window spill traps.
>> 1279 * The busy loop is necessary because the PIO error
>> 1280 * sometimes does not go away quickly and we trap again.
>> 1281 */
>> 1282 sethi %hi(pcic_regs), %o1
>> 1283 ld [%o1 + %lo(pcic_regs)], %o2
337 1284
338 ; Invoke PREEMPTION !! 1285 ! Get pending status for printouts later.
339 jl preempt_schedule_irq !! 1286 ld [%o2 + PCI_SYS_INT_PENDING], %o0
340 1287
341 ; preempt_schedule_irq() always return !! 1288 mov PCI_SYS_INT_PENDING_CLEAR_ALL, %o1
>> 1289 stb %o1, [%o2 + PCI_SYS_INT_PENDING_CLEAR]
>> 1290 1:
>> 1291 ld [%o2 + PCI_SYS_INT_PENDING], %o1
>> 1292 andcc %o1, ((PCI_SYS_INT_PENDING_PIO|PCI_SYS_INT_PENDING_PCI)>>24), %g0
>> 1293 bne 1b
>> 1294 nop
>> 1295
>> 1296 or %l0, PSR_PIL, %l4
>> 1297 wr %l4, 0x0, %psr
>> 1298 WRITE_PAUSE
>> 1299 wr %l4, PSR_ET, %psr
>> 1300 WRITE_PAUSE
>> 1301
>> 1302 call pcic_nmi
>> 1303 add %sp, STACKFRAME_SZ, %o1 ! struct pt_regs *regs
>> 1304 RESTORE_ALL
>> 1305
>> 1306 .globl pcic_nmi_trap_patch
>> 1307 pcic_nmi_trap_patch:
>> 1308 sethi %hi(linux_trap_ipi15_pcic), %l3
>> 1309 jmpl %l3 + %lo(linux_trap_ipi15_pcic), %g0
>> 1310 rd %psr, %l0
>> 1311 .word 0
>> 1312
>> 1313 #endif /* CONFIG_PCIC_PCI */
>> 1314
>> 1315 .globl flushw_all
>> 1316 flushw_all:
>> 1317 save %sp, -0x40, %sp
>> 1318 save %sp, -0x40, %sp
>> 1319 save %sp, -0x40, %sp
>> 1320 save %sp, -0x40, %sp
>> 1321 save %sp, -0x40, %sp
>> 1322 save %sp, -0x40, %sp
>> 1323 save %sp, -0x40, %sp
>> 1324 restore
>> 1325 restore
>> 1326 restore
>> 1327 restore
>> 1328 restore
>> 1329 restore
>> 1330 ret
>> 1331 restore
>> 1332
>> 1333 #ifdef CONFIG_SMP
>> 1334 ENTRY(hard_smp_processor_id)
>> 1335 661: rd %tbr, %g1
>> 1336 srl %g1, 12, %o0
>> 1337 and %o0, 3, %o0
>> 1338 .section .cpuid_patch, "ax"
>> 1339 /* Instruction location. */
>> 1340 .word 661b
>> 1341 /* SUN4D implementation. */
>> 1342 lda [%g0] ASI_M_VIKING_TMP1, %o0
>> 1343 nop
>> 1344 nop
>> 1345 /* LEON implementation. */
>> 1346 rd %asr17, %o0
>> 1347 srl %o0, 0x1c, %o0
>> 1348 nop
>> 1349 .previous
>> 1350 retl
>> 1351 nop
>> 1352 ENDPROC(hard_smp_processor_id)
342 #endif 1353 #endif
343 1354
344 b .Lrestore_regs !! 1355 /* End of entry.S */
345 <<
346 ##### DONT ADD CODE HERE - .Lrestore_regs actu <<
347 <<
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